JP2002092755A - Photovoltaic power generation system and control method for photovoltaic power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photovoltaic power generation system and a control method for the photovoltaic power generation system at a low cost superior in safety and capable of preventing an electric shock accident of an intruder intruding into a restricted area and dispensing with supervision by a regular supervisor or an authorized personnel. SOLUTION: The photovoltaic power generation system is provided with the restricted area 103 including an area wherein a solar battery module is located, a means 104 for preventing an intruder from intruding into the restricted area 103, and a detecting means 105 for detecting intrusion of the intruder into the restricted area. A predetermined electric shock prevention means started by a signal outputted by the detecting means 105 at detecting the intruder is actuated to prevent the electric shock of the intruder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photovoltaic power generation system and a control method for the photovoltaic power generation system. More specifically, the present invention relates to a photovoltaic power generation system and a control method for a photovoltaic power generation system that prevent an intruder from receiving an electric shock when an intruder enters a restricted access area including an area where a solar cell is installed.

[0002]

2. Description of the Related Art In recent years, environmental awareness has been spreading worldwide. Among them危倶sense of depletion and CO ₂ global warming due to discharge of fossil fuels is serious, desire for clean energy f are becoming increasingly stronger. Therefore, solar cell energy, which is a clean energy capable of directly converting solar energy into electric power, has been attracting attention, and the use of solar cells in various consumer fields is rapidly spreading.

[0003] Generally, solar cell modules have sufficient insulating properties and sufficient safety that no electric shock occurs even if one touches them, and the solar cell module has been commercialized and spread. There is a problem that the cost is still high because a large amount of covering material and insulating material are required because safety is ensured. As a result, solar cells with high power generation costs are not yet sufficiently applied to power plants, and have not been widely used. On the other hand, in a power plant or the like, there is a danger that an electric shock accident may occur due to intrusion of a person other than the administrator into the risk management area, and the accident may spread to the power system. To cope with this, various intrusion detection devices and devices for safety have been studied.

[0004] For example, an intruder detection device disclosed in Japanese Patent Publication No. 63-67718 is an outer periphery detector that is not a power plant but is arranged to surround a facility and detects passing objects. An inner circumference detector that is disposed around the equipment and detects objects passing therethrough, a filter that passes only the frequency of the output of the outer or inner circumference detector by a manager or a related person, and a vibration level caused by humans Measuring the output of the outer circumference detection circuit and the inner circumference detection circuit and the outer circumference or the inner circumference detection circuit each having a level detector that detects only
This is an intrusion detection device including an intrusion detection circuit that emits an intrusion detection signal when the number reaches a predetermined number within a predetermined time.

Conventionally, using the monitoring method described above,
We are studying ways to prevent intruders from entering and how to detect intruders. However, in conventional power plants such as thermal power generation and nuclear power generation, once the system is stopped, it takes a lot of time to restart the system, and the disadvantage of stopping the system is great. There was no idea that the entire power generation system would be stopped, but only an alarm or the like was issued and a security guard was notified.

[0006] In recent years, a solar power generation system in which a solar cell is installed on a roof of a general house has been spreading.

In such a photovoltaic power generation system, a solar cell module is connected in series to obtain a desired voltage. This series of solar cell modules is generally called a string. Some of the strings are connected in parallel so as to obtain a desired current, thereby forming a solar cell array having a desired power generation scale. In addition, components for controlling and connecting the peripherals are added to the solar cell array, and a solar power generation system is configured. Therefore, as the power generation scale required for the solar power generation system increases, the size of the solar cell array increases, and the number of solar cell modules constituting the array also increases. Therefore, when designing a photovoltaic power generation system, a predetermined number of modules or a predetermined area of solar cells are connected in series / parallel to realize a predetermined output voltage / current and a predetermined power generation capacity, thereby forming a system.

[0008] In order to obtain power generation with a larger capacity, it can be realized by increasing the number of series-parallel solar cell modules. However, the larger the power generation capacity,
As the number of series-parallel circuits increases, the voltage and current also increase. In general, the power generation capacity of a solar cell is determined by the intensity of incident sunlight. Briefly, in a photovoltaic power generation system operated at a constant voltage, the operating current changes in accordance with fluctuations in solar radiation, and output power is determined.

A solar power generation system and a protection system for a solar power generation system disclosed in Japanese Patent Application Laid-Open No. 7-177652 are disclosed in Japanese Patent Application Laid-Open No. 7-177652. A first switch for connecting or disconnecting, a second switch for short-circuiting or opening between the power output terminals, and a voltage value between detection terminals at a predetermined location of the solar cell string is compared with a predetermined value; It is configured to include a controller that controls opening and closing of the first switch and the second switch based on the compared signal. According to the photovoltaic power generation system and the protection method of the photovoltaic power generation system, a solar cell string whose voltage value between the detection terminals is equal to or less than a predetermined value is determined to be abnormal, and the power output terminal of the solar cell string is determined. By disconnecting from the output line and short-circuiting between the power output terminals, the defective solar cell string is cut off from the solar power generation system and invalidated.

[0010]

However, in the case of a power plant using a solar cell module, the installation scale is large and a large area is required. It is difficult to prevent an electric shock accident by just reporting to the security personnel, and the number of security guards has not been reduced from the viewpoint of cost, and conventional measures have been limited.

[0011] Further, the solar cell module used in the photovoltaic power generation system is designed so that the insulation performance is ensured in the initial use and in the normal use after installation. However, after installation, the possibility of insulation deterioration or insulation failure occurring due to unpredictable causes cannot be denied. For some reason, for example, there may be insulation failure such as breakage of the solar cell module surface coating material, cracks, scratches, and deformation of the surface glass. It is undeniable that there is a danger of electric shock when a person approaches and comes into contact with such an unpredictable exposed portion or defective portion. In particular, as described above, as the power generation scale increases, the voltage and current also increase with the increase in the number of series-parallel solar cells. Get higher.

In addition, with the recent spread of photovoltaic power generation systems, the number of solar cell arrays installed relatively close to the ground has increased, and children and workers unrelated to photovoltaic power generators (photovoltaic power generation systems) have become more common. Are more likely to touch the solar cell array, and considerations such as prevention of electric shock have become important. At present, the solar cell array is arranged in a strict fence, and it is not possible to arrange the solar cell array in a place where a lot of people enter and exit.

Further, the solar power generation system and the protection system of the solar power generation system described in Japanese Patent Application Laid-Open No. 7-177652 are designed to separate the solar cell string when a failure occurs, and to provide safety measures against intruders. Is not taken into account. Further, no consideration is given to malfunction of the protection system in the case of weak solar radiation or the like.

The present invention has been made to solve the above-mentioned problem, and can prevent an electric shock accident of an intruder who has entered a restricted access area or the like in a photovoltaic power generation system. It is an object of the present invention to provide a photovoltaic power generation system and a control method for the photovoltaic power generation system that do not need to be monitored, and that achieve high safety and low cost.

Another object of the present invention is to provide a highly safe control method for a photovoltaic power generation system in consideration of the installation location and installation method of a solar cell module.

[0016]

SUMMARY OF THE INVENTION For this purpose, a first aspect of the present invention is to provide a solar cell module, a restricted area including an area where the solar cell module is installed, and an intruder in the restricted area. Provided is a photovoltaic power generation system having: a detection unit that detects that a vehicle has entered the vehicle and outputs a signal; and an electric shock prevention unit that operates based on the signal output by the detection unit.

A second aspect of the present invention is a solar cell module, a restricted access area including an area where the solar cell module is installed, and a detecting means for detecting that an intruder has entered the restricted access area. And a control method for a photovoltaic power generation system having an electric shock prevention means, wherein the detection means detects that an intruder has entered the restricted access area, and based on the output signal, the electric shock prevention means. A method for controlling a solar power generation system to be operated is provided.

According to the first and second photovoltaic power generation systems and control methods of the present invention, it is not necessary for the observer to constantly monitor the intruder, and when the intruder is detected, the observer can immediately monitor the intruder. Since there is no need to go to the site and take safety measures such as electric shock prevention, the number of observers can be reduced. Further, security against intruders can be ensured. In addition, the detection means emits a signal at the same time as detecting an intruder, and the signal activates an electric shock prevention means such as a means for completely short-circuiting or completely opening each module or every safety voltage, or a means for short-circuiting each string. It is possible to prevent an intruder from electric shock without requiring time from detection of an intruder to safety measures.

In the first and second aspects of the present invention, it is preferable to have means for preventing an intruder from entering the restricted access area.

It is preferable to provide a fence, a fence, a fence or a groove as means for preventing an intruder from entering. This makes it difficult for an intruder to easily enter the restricted access area, and also prevents an electric shock accident and an accident from spreading to the power system.

It is also preferable to provide double means for preventing intruders from entering. This makes it more difficult for an intruder to enter the restricted access area as compared with the case where the means for preventing intrusion is provided as a single unit, and it is also possible to prevent electric shock accidents and accidents from spreading to the power system.

It is preferable that the detecting means is provided in a means for preventing an intruder inside from among the means for preventing an intruder from being doubled. Thereby, when detecting an intruder, means for preventing a single intrusion or 2
The malfunction can be reduced as compared with the case where the detecting means is provided in the means for preventing intrusion outside of the means for preventing heavy intrusion, and the operation rate of the photovoltaic power generation system can be improved.

Further, it is preferable to use any of a proximity sensor, an optical sensor, a magnetic sensor, a magnetic sensor, a temperature sensor, a humidity sensor, an impact sensor, an acceleration sensor, a weight sensor, a current sensor, and an electromagnetic wave sensor as the detecting means. . By using such an electronic sensor, detection accuracy is improved and centralized monitoring can be performed, so that the number of monitoring persons can be reduced, and further, security against intruders can be easily ensured. In addition, it is not necessary for the observer to constantly monitor the intruder, and every time an intruder is detected, it is not necessary for the observer to take safety measures such as preventing electric shock. Time can be further reduced, and an intruder can be prevented from electric shock.

Further, it is preferable that the electric shock prevention means is means for short-circuiting the solar cell module or a solar cell string in which the solar cell modules are connected in series. This allows the system to be shut down immediately without destroying the photovoltaic power generation system. In addition, the voltage of each part of the photovoltaic module in series becomes zero, preventing intruders from accidents such as electric shock. It is possible to do. In addition, it is possible to restore the system immediately after confirming the safety.

It is preferable that a circuit breaker is provided in the electric shock prevention means to cut off and invalidate the solar cell module or the solar cell string from the solar power generation system. This makes it possible to prevent an intruder from an accident such as electric shock without destroying the photovoltaic power generation system, and furthermore, it is possible to cancel the system immediately after confirming safety.

It is preferable that at least two solar cell strings are connected in parallel to form a solar cell array.

Further, it is preferable that the electric shock prevention means has a function of canceling the electric shock prevention function.

As described above, the first and second photovoltaic power generation systems and control methods of the present invention are intended to prevent an intruder from being shocked by a simple method in a power plant or the like using a solar cell module. This is a system for safely stopping the function of the power generator itself. More specifically, means are provided for shutting down the power plant system itself to ensure absolute safety that the power plant itself is in the absence of high voltage in the array for human safety. Further, in an environment of a power plant, it is important that a configuration that emphasizes maintenance is important, so that a system optimized for it also ensures safety against intruders and the like.

A third aspect of the present invention is a solar cell array formed by connecting a plurality of solar cell modules, one or a plurality of sensors arranged around the solar cell array, and the solar cell array. And a switch for short-circuiting the output terminal of the photovoltaic power generation system, wherein the control method of the photovoltaic power generation system for short-circuiting the output terminal based on an output signal of the sensor is provided.

The third control method for a photovoltaic power generation system according to the present invention has a further feature that, when the output signal of the sensor is equal to or less than a predetermined value, the output terminal of the photovoltaic array is short-circuited. Outputting an alarm before short-circuiting the end; short-circuiting the output end of the solar cell array when a predetermined time elapses after the alarm is issued if the output signal of the sensor is equal to or less than a predetermined value; The short-circuit state of the state includes that the state is maintained until the release operation is performed.

A fourth aspect of the present invention is that a plurality of solar cell strings formed by connecting a plurality of solar cell modules, a plurality of sensors arranged around each of the plurality of solar cell strings, In a control method for a photovoltaic power generation system having a plurality of switches that short-circuit each output end of a solar cell string, the plurality of solar cell strings are connected in parallel, and based on output signals of the plurality of sensors. Thus, there is provided a control method of a photovoltaic power generation system for short-circuiting an output end of each of the plurality of solar cell strings.

The fourth method of controlling a photovoltaic power generation system according to the present invention has, as a further feature, a sensor that outputs an output signal of a predetermined value or less when a part of the output signals of the plurality of sensors is a predetermined value or less. Short-circuiting the output end of the solar cell string corresponding to, outputting an alarm before shorting the output end of each string of the solar cell array, and the output signal of the sensor for each string of the solar cell array being equal to or less than a predetermined value. In this case, after a predetermined time elapses after the alarm is issued, the output terminal of each string is short-circuited, and the short-circuit state of the output terminal of each string of the solar cell array is maintained until a release operation is performed. .

According to the third and fourth methods of controlling a photovoltaic power generation system of the present invention, an output signal of a sensor installed around a solar cell array is detected, and a local figure of the array is detected from the signal. If it is determined that the detection has been made, by controlling the switch between the array or string terminals, the array or string is short-circuited, and in the solar cell module, if the surface coating material is broken, the surface glass is broken, scratched, deformed, etc. Even if there is a poor insulation part,
It is possible to prevent an electric shock accident caused by a person touching the place.

Further, when the first to fourth photovoltaic power generation systems and control methods of the present invention are used particularly in a power plant,
It is necessary to reduce the cost of the solar cell module as much as possible.
One way to reduce costs is to reduce the materials used to form the solar cell module. In addition, the photovoltaic power generation system used in the power plant can be provided as a hazard control area with measures to prevent anyone other than the operator from easily entering the premises. It is more likely that the solar cell module need not be used, and it is better to maintain the maintenance. Can be greatly reduced, and there is no problem even if the safety such as exposure of the live parts is reduced. In other words, the present inventor has found that a solar cell module in a special environment of a power plant is sufficient and effective with a simple coating, and has reached the following invention.

That is, in the above-described first to fourth photovoltaic power generation systems and control methods of the present invention, the photovoltaic element provided on the outermost surface on the light-receiving surface side of the solar cell module is directly in contact with the atmosphere. It is preferably installed in Thereby, there is no energy loss of the incident light due to absorption and / or reflection of the surface coating material or the like, and the incident light can be efficiently converted into electricity.

It is also preferable that the solar cell module has a covering material only on the outermost surface on the light receiving surface side. As a result, it is possible to significantly reduce material costs,
In the unlikely event that the solar cell breaks down, replacement can be easily performed.

It is also preferable that at least one light receiving surface side of the solar cell module is covered. This makes it possible to improve the weather resistance of the solar cell, and when the solar cell breaks down, only the covering material of the failed solar cell can be peeled off, so that replacement is easy. In addition, replacement costs can be significantly reduced.

Further, in the solar power generation system, it is preferable that a part of the live part is exposed. As a result, the administrator can easily detect the faulty module, and the workability of the inspection can be greatly improved.

A fifth aspect of the present invention is a solar cell string formed by connecting a plurality of solar cell modules, a plurality of sensors provided around the solar cell string, and output signals of the plurality of sensors. A first step of measuring output signals of the plurality of sensors and normalizing a value of the output signal in a control method of a photovoltaic power generation system having a switch that short-circuits an output end of the solar cell string based on the first step. A second step, and when at least one of the plurality of normalized output signal values Ax is larger than the reference value S, the comparison calculation value D is calculated as follows: the comparison calculation value D = (the plurality of normalized output signal values Ax Ax
A third value obtained from (minimum value) / (maximum value of the plurality of standardized output signal values Ax), and when the comparison calculated value D is smaller than a comparison reference value D0, the switch outputs the output. And a fourth step of short-circuiting the ends.

The fifth method for controlling a photovoltaic power generation system according to the present invention has a further preferable feature that an alarm is output before the output terminal is short-circuited, and that the output time of the alarm is longer than the reference time T0. Short-circuiting the output end with a switch, and that the sensor comprises a solar cell.

A sixth aspect of the present invention is a solar cell string formed by connecting a plurality of solar cell modules, a plurality of sensors provided around the solar cell string, and an output of the solar cell string. In a method for controlling a photovoltaic power generation system in which a plurality of solar cell strings each having a switch whose end is short-circuited are connected in parallel, (1) an output of the plurality of sensors for each of the plurality of solar cell strings A first step of measuring a signal, a second step of normalizing the value of the output signal, and a comparison calculation value when at least one of the plurality of normalized output signal values Ax is larger than a reference value S. Dy
From the comparison calculation value Dy = (the plurality of normalized output signal values A
x minimum value / (the plurality of standardized output signal values Ax)
(2) a comparison calculation smaller than the comparison reference value D0 when at least one of the comparison calculation values Dy of the plurality of solar cell strings is smaller than the comparison reference value D0. There is provided a control method for a photovoltaic power generation system, which performs a fourth step of short-circuiting an output terminal of a solar cell string corresponding to a value Dy by a switch.

As a further preferable feature, the sixth control method of the photovoltaic power generation system according to the present invention is characterized in that before the output terminal of the solar cell string corresponding to the comparison calculated value Dy smaller than the comparison reference value D0 is short-circuited, Outputting an alarm for the solar cell string, if the output time of the alarm is longer than the reference time T0, short-circuiting the output end of the solar cell string corresponding to the comparison calculated value Dy smaller than the comparison reference value D0, , Consisting of solar cells,
including.

According to the fifth and sixth control methods of the photovoltaic power generation system of the present invention, by comparing the signals of the respective sensors with each other, it is possible to output an unnecessary alarm and to output the solar cell array or the solar cell string. Electric shock accidents can be prevented beforehand while preventing malfunctions such as unnecessary short circuits. The configuration and effects of the present invention will be described later in detail with reference to the drawings.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] The first embodiment is an embodiment of a solar power generation system according to the present invention.

FIG. 1 shows a solar power generation system 10 according to the present invention.
1, the restricted access area 103 including the area 102 where the solar cell module is installed, the restricted access area 103
Means 104 for preventing an intruder from entering the intruder, intruder detecting means 1 provided in the means 104 for preventing an intruder from entering the
05 and a layout diagram of a building 106 in which devices necessary for the solar power generation system 101 are arranged.

In the building 106, a connection box for connecting solar cell strings in parallel, an inverter for converting DC power generated by the solar cell module into AC power, and an intruder detecting means 105 output when an intruder is detected. An electric shock prevention means operated by a signal is provided. This solar power generation system has a fence (means 1 for preventing intruders from entering).
04), any of the plurality of intruder detection means 105 detects the intruder, and simultaneously with the detection of the intruder, the electric shock prevention means is activated by the signal output from the detection means 105, and the intruder is electrically shocked. Prevent from.

Hereinafter, each component will be described.

(Photovoltaic Power Generation System) The photovoltaic power generation system is configured such that solar cell modules are connected in series to obtain a desired voltage. This series of solar cell modules is generally called a string. Some of these strings are connected in parallel to form a solar cell array having a desired power generation scale. Peripheral control, protection,
Each component such as a power converter for connection is added,
A solar power generation system is configured. For example, each solar cell module is mounted on a gantry having an optimum inclination with respect to incident light, and conduction between the solar cell module and the solar cell is established by using a metal foil such as a copper foil and connecting them by soldering or the like. Has been taken. In addition, it is preferable that the metal foil is adhered to the back reinforcing material or the pedestal of the solar cell module with a double-sided tape or the like, so that the metal foil is hardly broken.

(Restricted access area) The restricted access area indicates a place where high-pressure or extra-high-pressure machinery and equipment, buses, and the like are installed outdoors, including an area where a solar cell is installed. Further, it is preferable to provide a means such as a fence, a fence, a fence, a groove, or the like for preventing an intruder from entering the premises of the restricted access area. Further, it may be displayed that entry to the entrance is prohibited.

(Solar Cell) The solar cell is not particularly limited, and examples thereof include a solar cell using a semiconductor material such as a single crystal, a polycrystal, a compound, a thin film, and an amorphous. In the case of an amorphous semiconductor solar cell, for example, a back electrode layer, a transparent conductive layer, an n-type semiconductor layer, an intrinsic semiconductor layer, a p-type semiconductor layer, and a transparent electrode layer are formed on a substrate made of a conductive material or an insulating material. A layer having a layered structure in which layers are sequentially stacked is used, and a branch-shaped current collecting electrode that does not block incident light is formed on the uppermost transparent electrode layer serving as a light incident surface. However, the present invention is not particularly limited to this structure.

(Solar Cell Module) The form of the solar cell module includes a module using a crystal cell, a thin film cell or a polycrystalline cell, but is not particularly limited. However, a solar cell module suitable for a power plant desirably has a simple covering structure in which the live parts are exposed,
For example, by providing a coating material only on the light-receiving surface side of the photovoltaic element directly formed on a metal substrate such as SUS having weather resistance, and attaching it directly to a mount, etc., maintenance with minimum weather resistance is possible. Solar cell modules that are easy to use.

(Coating Material) The coating material is used for the purpose of protecting the solar cell module from external dirt, and improving the weather resistance of the solar cell module, such as prevention of external damage. Therefore, the coating material is required to have transparency, weather resistance and stain resistance. Materials that satisfy such requirements and are preferably used include fluorine resin, acrylic resin, urethane resin, silicone resin, and glass. As a simple coating method for providing these materials on the light-receiving surface side surface, a method of forming a film and laminating, a method of providing by coating, a method of arranging an adhesive and bonding them, and the like can be mentioned.

Depending on the application, it may be provided only on the front side or on the back side. When used in a power plant, it may be arranged only in the vicinity of the solar cell to reduce costs. As a particularly suitable material, a base material which is an adhesive film that can be attached to a photovoltaic element is a polyethylene film, and a polyethylene protective sheet using an acrylic adhesive as an adhesive is inexpensive and has excellent weather resistance. It is mentioned from the thing.

(Detecting means) The detecting means has a function of detecting a person or an animal or the like, and has a function of transmitting a signal notifying the intrusion to the electric shock prevention means. Although not particularly limited, for example, electronic sensors such as a proximity sensor, an optical sensor, a magnetic sensor, a magnetic sensor, a temperature sensor, a humidity sensor, an impact sensor, an acceleration sensor, a weight sensor, a current sensor, and an electromagnetic wave sensor are suitable.

(Junction box) The junction box connects the power output from the strings, and includes string disconnecting means capable of individually disconnecting a plurality of strings, current collecting means for collecting power generated by the plurality of strings, Backflow prevention means for preventing current backflow between strings, DC cutoff means for cutting off collected DC current, and maintenance and inspection means capable of measuring the open voltage and insulation resistance of the solar cell array are often stored. For example, a string disconnector and a branch disconnector for connecting the power output from the strings, a string disconnecting means capable of individually disconnecting a plurality of strings as a collecting electrode made of a copper plate, and for preventing a current reverse flow between the strings. Backflow prevention diode as a backflow prevention means, DC breaker as a DC blocking means for blocking the collected DC current, positive and negative terminals of breakers as maintenance and inspection means capable of measuring the open voltage and insulation resistance of the solar cell array, A measuring terminal between a part of a solar cell electric circuit such as a copper plate and a ground terminal, and the like are included.

(Electric Shock Prevention Means) The electric shock prevention means is means for stopping the solar power generation system itself. By stopping the system, electric shock of a person or the like can be prevented. For example, as a means for preventing electric shock, a sensor provided near the solar cell module for detecting a person or the like is a short-circuit switch that short-circuits a solar cell activated by a signal output when a person or the like is detected, and opens a solar cell. Open switch, a switch for short-circuiting the solar cell string, and the like. In particular, a means for short-circuiting a solar cell is desirable because there is no risk of electric shock even if a human touches any live part of the short-circuited solar cell module. As a specific configuration example, an intruder detection sensor is provided near a solar cell module arranged in the restricted access area, and a solar cell short-circuit switch is provided by a signal output when the intruder detection sensor detects an intruder. Is activated, and if an intruder touches a part of the photovoltaic power generation system, there is no electric shock. When an open switch is provided for each solar cell string, a high voltage may be applied to the live part and there is a danger of electric shock. Is preferred.

(Short-circuit means) Short-circuit means refers to means for connecting the positive and negative electrodes of the photovoltaic power generation circuit with a conductor to short-circuit. Although not particularly limited, transistors, IGBT, GTO, M
Examples include a method of performing switching by a semiconductor such as an OSFET and a thyristor, and a method of performing mechanical switching using a magnet conductor, a relay, or the like.

(Opening means) Opening means means for opening the positive and negative poles of the photovoltaic power generation circuit. Although not particularly limited, transistors, IGBT, GTO, MOSF
Examples include a method of performing switching by a semiconductor such as an ET and a thyristor, and a method of performing mechanical switching using a magnet conductor, a relay, or the like.

[Second Embodiment] A second embodiment is an embodiment of a method for controlling a photovoltaic power generation device (photovoltaic power generation system) according to the present invention.

FIG. 14 is a configuration diagram of a photovoltaic power generator (photovoltaic power generation system) according to the second embodiment.
Is a configuration diagram of a roof on which the solar power generation system is installed.

In the photovoltaic power generation system according to the present embodiment, the solar cell modules (11a to 11c) are configured in 16 series of solar cell modules, and the solar cell array 11 is configured in parallel with the three solar cell strings. It is installed on the roof 21 of.

Each solar cell string (11a to 11c)
+ Terminal and-terminal are switches 1 for photovoltaic power generation system
3 is provided with a backflow prevention diode 14 on the + side wiring. These solar cell strings are connected in parallel, and the wiring is led to the main switch 15 and the array short-circuit switch 16. The solar inverter 17 is connected to a commercial AC system 18 of a house switchboard.
Note that the solar cell of this embodiment may be crystalline or amorphous (including microcrystal).

In the second embodiment, six sensors (12a to 12f) are arranged around the solar cell array 11. As shown in FIG. 16, these sensors are configured by directly connecting + or-ends of a plurality of solar cells (31 a to 31 n) with a connector 32. Electrical resistances (for example, shunt resistances R) (R1 to R6) are connected to the + and-ends of the serialized cells. Then, the operating current of the solar cell is detected as the voltage value of the voltage across the shunt resistor R. In addition, as the solar battery cell which is the sensor of the second embodiment, any of a crystalline or amorphous (including microcrystalline) silicon solar battery can be used.

The sensor is not particularly limited to a solar cell, but may be any sensor that can detect that a person approaches the solar cell array, and may output a signal indicating the detection.

A method for controlling the photovoltaic power generation device (photovoltaic power generation system) according to this embodiment will be described with reference to FIG. The switch 13 for the photovoltaic power generation system, the backflow prevention diode 14, and the main switch 15 are built in a connection box 45.

As the current detecting means of the human shadow sensor, the voltages at both ends of R1 to R6 are respectively set to C1 to C6 via shunt resistors R1 to R6, and they are input to the analog / digital converter 41 to measure the signal of the sensor. I do. Then, the current signals of the sensors are measured and calculated, and the signal values of the sensors are compared, and when there is a deviation of a predetermined value or more, it is determined that a person approaches and casts a shadow (for details,
It will be described later. ).

The switch controller 44 for controlling the switch 16 of the solar cell array supplies electricity to the photocoupler of the switch controller 44 via the digital output 43 from the personal computer 42 to turn on the external DC power supply. The switching of ON / OFF is performed to control supply and stop of a voltage for opening and closing the DC electromagnetic contactor to the switch 16. The release of the opening and closing of the switch 16 is held until an operation is performed. The release operation may be manual or automatic.

[Third Embodiment] A third embodiment is another embodiment of a method for controlling a photovoltaic power generator (photovoltaic power generation system) according to the present invention. Note that, in the present embodiment, the same reference numerals are given to configurations substantially similar to those of the second embodiment, and detailed description thereof will be omitted.

The solar power generation system according to the present embodiment
Based on the configuration of the photovoltaic power generation system according to the embodiment, the sensors (12a to 12a) are provided not only around the solar cell array but also around the string as shown in FIGS.
n) is installed. Then, instead of short-circuiting the array of the photovoltaic power generation system under the short-circuit condition described in the second embodiment, short-circuiting is performed only for the string corresponding to the sensor that has determined that a human figure has been detected. For this reason, in the present embodiment, a string to which no human or the like approaches can generate power without waste. With such a configuration, the sensor can be used as a human shadow sensor.

In the solar power generation system of this embodiment,
In the photovoltaic power generation system of the second embodiment, sensors (12a to 12n) are provided around the solar cell string as shown in FIGS. 21 and 22 based on FIG. Second
A sensor is manufactured as shown in FIG. 16 of the embodiment. R1
The voltage C1 to C14 across the shunt resistor R1 to R14 is input to the analog / digital converter 41, and the operating current of the sensor (solar cell) is detected as the voltage value of the voltage across the shunt resistor. Then, the current signals of the sensors are measured and calculated, and the signal values of the sensors are compared, and if there is a deviation of a predetermined value or more, it is determined that a person has approached and cast a shadow (details will be described later). ). With such a configuration, the sensor can be used as a human shadow sensor.

The switch controller 44 for controlling the string short-circuit switch 61 of the DC electromagnetic contactor is connected to the photocoupler of the target string switch controller 44 via the digital output 43 from the personal computer 42. When a current is supplied, switching of the external DC power supply is performed, a voltage is supplied to the string short-circuiting switch 61, and the switch 61 is short-circuited. Do. The release of the open / close state of the string short-circuiting switch 61 is held until an operation is performed.
The release operation may be manual or automatic.

[0073]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

(Embodiment 1) In this embodiment, the presence of an intruder entering a restricted access area including a solar cell installation area surrounded by a wall is detected by the detection means, and at the same time, the electric shock prevention means is activated. This is an example of a solar power generation system that prevents an intruder from receiving an electric shock by causing the intruder to receive an electric shock.

FIG. 2 shows a photovoltaic power generation system according to this embodiment, and is a restricted access area 20 including a solar cell installation area 201.
2. A wall (intrusion prevention means) 203 surrounding the restricted access area 202 for preventing an intruder from entering, a door 204 provided on a part of the wall 203, which is connected to the restricted access area, and a photovoltaic power generation system. It is an arrangement | positioning figure of the solar power generation system 206 which consists of the building 205 which arranges each apparatus. Building 2
A connection box for connecting the solar cell strings in parallel, an inverter for converting DC power generated by the solar cells into AC power, and the like are provided in 05.

FIG. 3 shows a circuit diagram of the photovoltaic power generation system of this embodiment. In this embodiment, a connection box 2 for connecting the solar cell strings 207 in parallel is provided in the building 205.
08 and an inverter 210 for converting DC power generated by the solar cell array into AC power. An interlock mechanism is used as a means for preventing an intruder from electric shock (electric shock prevention means). When an intruder opens a door 204 leading to the restricted access area 202, a signal output by a sensor 211 provided on the door 204 is used. Accordingly, the relay switch 209 that short-circuits the solar cell string 207 provided for each solar cell string 207 is operated. As a result, even if an intruder touches the live part of the photovoltaic power generation system, the structure is such that no electric shock is caused. This makes it possible to detect an intruder entering the restricted access area, which is a risk management area, and at the same time prevent the intruder from being electrocuted. Further, it is not necessary for an administrator or a person concerned to constantly monitor, and costs can be reduced because the number of persons to be monitored can be reduced. In addition, it is possible to immediately return to the normal operation after the safety is confirmed.

FIG. 4A is a configuration diagram of a solar cell module 301 used in the solar cell power generation system according to the present embodiment, and FIG. 4B is a diagram illustrating a normal power generation by the solar cell power generation system according to the embodiment. FIG. 4C shows a circuit diagram when a sensor provided on the door detects an intruder and a relay for short-circuiting the solar cell string is activated to prevent the intruder from electric shock. FIG. 5 is a cross-sectional view taken along line AA ′ in FIG.

The solar cell module 30 used in this embodiment
Reference numeral 1 denotes a structure in which a metal back reinforcing plate 303, an insulating sheet 305, an amorphous silicon solar cell 302, an interconnector 306, and an adhesive protection film 304 are laminated in this order. The adhesive protection film 304 extends from the surface of the amorphous silicon solar cell 302 to the metal back reinforcing plate 30.
The amorphous silicon solar cell 302 and the insulating sheet 305 are fixed to the metal back reinforcing plate 303.

The solar cell module 301 constituting the solar cell string includes an amorphous silicon type solar cell 3
02 only one by one (adhesive protective film 304)
, The interconnector 306 connecting the cells has a part of the live part exposed. A silicon sealant 307 is provided at an end of the coating material at a tab wiring portion where water may enter, thereby improving waterproofness.

In the solar power generation system of this embodiment, when an intruder is detected, a predetermined solar cell string is short-circuited by a relay switch 209 provided for each solar cell string operated by a signal output from a sensor. . As a result, there is no portion where a high voltage is generated in each part of the solar cell string, and even if an intruder touches the live part, there is no possibility of electric shock, and furthermore, after safety is confirmed, the administrator By returning the relay switch 209 to the original state, the photovoltaic power generation system can be immediately restored, and the power generation loss can be minimized.

As described above, by making use of the special environmental condition of providing the solar cell in the restricted access area, it is possible to reduce the material constituting the solar cell module to the minimum necessary, and to reduce the cost as much as possible. it can.
Further, even if the solar cell module is damaged, it can be easily replaced.

(Embodiment 2) In this embodiment, as shown in FIG. 6, in a photovoltaic power generation system, a vehicle enters a restricted access area including a solar cell installation area surrounded by a double fence (intrusion prevention means). A relay switch (shock prevention means) that detects the presence of a breaking intruder by a plurality of vibration sensors arranged inside the double fence and, at the same time, short-circuits the solar cell
Is an example of a photovoltaic power generation system that operates to prevent an intruder from being electrocuted.

FIG. 6 shows a photovoltaic power generation system according to the present embodiment.
1 and a double fence (503a, 503) for preventing an intruder from entering the restricted area 502.
b) An arrangement diagram of the vibration sensor 504 arranged on the fence 503b inside the double fence and the solar power generation system 506 including the building 505 in which a junction box and an inverter required for the solar power generation system are arranged are shown. Things. FIG. 7 is a circuit diagram of the photovoltaic power generation system according to the present embodiment.

The control circuit of the photovoltaic power generation system 506 of this embodiment includes a vibration sensor 504 provided on the inner fence 503b for detecting an intruder, and the vibration sensor 50.
4, a relay switch 509 activated by a signal output when an intruder is detected, a plurality of solar cell modules 50
7 comprises a connection box 510 for connecting solar cell strings 508 connected in series to each other, and an inverter 511 for converting DC power generated by the solar cells into AC power.

The solar cell module used in the present embodiment has the same configuration as the solar cell module used in the first embodiment, and a description thereof will be omitted.

By using a double fence as in this embodiment, an intruder who tries to enter the restricted access area, which is a risk management area, is hard to enter, and the vibration sensor is mounted on the fence 503b inside the double fence. By providing the 504, it is possible to reduce erroneous operations when detecting an intruder. Further, when the intruder is detected by the vibration sensor, the solar cell module 507 is simultaneously switched to the relay switch 509.
As a result, it is possible to prevent an intruder from being electrocuted due to the short circuit. Further, since the relay switch 509 is provided for each solar cell module, it is possible to short-circuit only the solar cell module near the vibration sensor that detected the intruder. In addition, it is not necessary for an administrator or a person concerned to constantly monitor, and costs can be reduced because the number of monitoring persons can be reduced. In addition, by returning the relay switch in which the solar cell module is short-circuited to the original state after the safety check, it is possible to quickly return to the normal operation.

(Embodiment 3) In this embodiment, the intruder intrudes into the restricted access area including the solar cell installation area covered by the fence and the water-filled groove (intrusion prevention means) in the solar power generation system. This is an example in which an intruder is prevented from being electrocuted by detecting its presence by using a plurality of infrared sensors arranged along the periphery and operating a switch (electric shock prevention means) that opens the solar cell in conjunction with the detection.

FIG. 8 shows a photovoltaic power generation system according to the present embodiment.
1 and fence 603 to prevent anyone other than the administrator from entering the restricted area 602.
Building 6 where devices and equipment such as inverters and junction boxes necessary for the solar power generation system are arranged.
FIG. 5 shows an arrangement diagram of a photovoltaic power generation system 606 composed of the photovoltaic power generation system 05.

In the photovoltaic power generation system of this embodiment, an infrared sensor for detecting that an intruder has entered the restricted access area is provided for each pillar of the fence 603, and a signal is output when any of the infrared sensors detects the intruder. At the same time, the solar battery release switch provided for each solar battery cell is interlocked to prevent an intruder from being electrocuted. Further, by filling the groove 604 with water, it is possible to prevent an intruder from entering the restricted access area, which is a risk management area, and moreover, it is difficult for vegetation that produces shadows that can affect the power generation of the photovoltaic power generation system to grow. ing. Furthermore, the intrusion of an intruder can be detected day and night by an infrared sensor. At the same time as the infrared sensor detects the intruder, the switch that opens the solar cell operates to prevent the intruder from being electrocuted. be able to. Further, it is not necessary for an administrator or a person concerned to constantly monitor, and the number of persons to be monitored can be reduced, so that the cost can be reduced. Further, it is possible to return to the normal operation immediately after the safety check.

FIG. 9A is a configuration diagram of a solar cell module 701 used in the solar power generation system according to the present embodiment.
9B is a circuit diagram when the photovoltaic power generation system of this embodiment is performing normal power generation, and FIG. 9C is for preventing the intruder from electric shock when the proximity sensor detects the intruder. FIG. 2 shows a circuit diagram when a relay for short-circuiting a solar cell is activated.

The solar cell module 701 used in the solar power generation system of this embodiment includes a solar cell 702, a back reinforcing plate 703, a relay switch 704, a covering member 705,
It is made of a silicone sealant 706.

In the photovoltaic power generation system of this embodiment, when an intruder is detected, the solar cell is short-circuited by the relay switch 704 provided between the solar cells operated by the signal 707 output from the proximity sensor. To prevent electric shock. Further, the solar battery cells 702 are covered with a covering material 705 one by one, and the live parts between the solar battery modules are partially exposed. At the end of the covering material 705, a silicone sealant 706 is provided at a tab wiring portion where water may enter, thereby improving waterproofness. This makes it possible to easily detect a failed solar cell using the portion where the live part is exposed.

According to the control method of the photovoltaic power generation system of the present embodiment, even if an intruder touches the live part, there is no possibility of electric shock, and after safety is confirmed,
By returning the relay (electric shock prevention means) to the original state, the photovoltaic power generation system can be restored immediately, and the power generation loss can be minimized.

(Embodiment 4) In the present embodiment, a relay for short-circuiting a solar cell at both ends for each series number of solar cells provided within a solar cell installation area and a solar cell within a safe voltage in a solar power generation system. Provide a switch (electric shock prevention means), detect the intruder by its proximity sensor,
This is an example of preventing an intruder from being electrocuted by operating a relay switch in conjunction with a proximity sensor.

FIG. 10 shows a photovoltaic power generation system according to the present embodiment.
FIG. 1 shows a layout diagram of a photovoltaic power generation system 804 including a restricted access area 802 including No. 01 and a building 803 in which devices and equipment such as an inverter and a junction box necessary for the photovoltaic power generation system are arranged.

The control circuit of the photovoltaic power generation system of this embodiment includes a relay switch for short-circuiting the solar cell string,
It is configured with a proximity sensor, a connection box for connecting solar cell strings in parallel, and an inverter for converting DC power generated by the solar cell array into AC power.

In the photovoltaic power generation system according to the present embodiment, when a proximity sensor detects an intruder, a relay switch that short-circuits a solar cell disposed in the photovoltaic module by a signal output from the proximity sensor is operated to activate the solar cell. The battery cell is short-circuited to prevent an intruder from being electrocuted.

FIG. 11A is a configuration diagram of a solar cell module 901 used in the photovoltaic power generation system of this embodiment, and FIG. 11B is a photovoltaic power generation system of this embodiment which normally generates power. FIG. 11C shows a circuit diagram when a proximity sensor detects an intruder and a relay for short-circuiting the solar cell string is activated to prevent the intruder from electric shock.

The solar cell module 901 used in the photovoltaic power generation system of this embodiment includes a solar cell 902, a back reinforcing plate 903, a relay switch 904, a covering member 905,
It consists of a silicone sealant 906.

In the photovoltaic power generation system of this embodiment, when an intruder is detected, the solar battery is operated by the relay switches 904 provided at both ends of every three series of the solar battery cells 902 which are activated by a signal output from the proximity sensor. The cell 902 is opened to prevent an intruder from being electrocuted. Further, the solar cells are covered one by one with a covering material 905, and the live parts between the solar cell modules are partially exposed. A silicon sealant 906 is provided at an end of the covering material at a tab wiring portion where water may enter, so that the waterproof property is improved. This allows
It is possible to easily detect a failed solar cell using the portion where the live part is exposed. Even if an intruder touches a live part, there is no possibility of electric shock, and after safety is confirmed, the solar power generation system can be restored immediately by returning the relay (electric shock prevention means) to its original state. And the power generation loss can be minimized.

(Embodiment 5) In this embodiment, an intruder is detected by a proximity sensor, a solar cell open switch and a blocking diode provided for each solar cell module in a solar cell installation area in a solar power generation system, and the intruder is detected. This is an example of preventing an electric shock.

FIG. 12 is a circuit diagram of the photovoltaic power generation system according to this embodiment. The photovoltaic module 1002, the photovoltaic cell open switch 1003, the proximity sensor 1004, the blocking diode 1005, and the photovoltaic module 100
A connection box 1006 for connecting the two in parallel, an inverter 1 for converting DC power generated by the solar cell array into AC power
007 is a circuit diagram of a solar power generation system 1001.

In the photovoltaic power generation system of the present embodiment, when the proximity sensor 1004 detects an intruder, the signal 1008 output from the proximity sensor 1004 activates the solar cell open switch 1003 provided for each solar cell module 1002. By causing the solar cell module 1002 to be in an open state, an intruder is prevented from being electrocuted. At this time, since the blocking diode 1005 is provided for each solar cell module 1002, the solar cell module 1 in which the electricity generated by the other parallel-connected solar cell modules 1002 is open.
002. Thereby, even if the intruder touches the live part of the solar cell module, there is no danger to the body due to electric shock.
Furthermore, since only the solar cell module close to the intruder is opened, a minimal power generation loss is required.

FIG. 13 is a view showing a solar cell module used in the photovoltaic power generation system of this embodiment. The solar cell module 1101 has a layer configuration including a back reinforcing plate 1102, an insulating sheet 1103 disposed on the back surface of the solar cell 1104, the solar cell 1104, and the surface covering material 1105. Note that electricity generated by the solar cell 1104 is extracted by the lead wire 1106, but the surface coating material 1105 does not cover a part of the lead wire 1106, and the live part is exposed.

In this embodiment, an iron plate as the back reinforcing plate 1102, a PET sheet as the insulating sheet 1103, an amorphous silicon solar cell as the solar cell 1104, a polyethylene protective sheet as the surface covering material 1105, and a copper foil as the lead wire 1106. Used.

By using the solar cell module as in the present embodiment, it becomes possible to configure a solar power generation system with the minimum necessary material cost without impairing the power generation function.

(Embodiment 6) This embodiment is an example of a method for controlling the photovoltaic power generation apparatus (photovoltaic power generation system) of the present invention shown in FIGS. 14 to 17 as described in the second embodiment.

In the photovoltaic power generation system of this embodiment, a solar cell array is constituted by 16 series and 3 parallel arrangements of stacked amorphous solar cell modules made by Canon (Canon module, trade name: SR-02). installed. That is, the total number of the solar cells is 48, the maximum output operation voltage is 176 V, the maximum output operation current is 6.9 A, and the standard solar cell output at this time is a total of 1.2 kW (AM 1.5,
1 Sun, measured at 25 ° C.).

Sensors around the solar cell array (12a-1
As 2f), an amorphous solar cell is used, and as shown in FIG. 16, the positive and negative ends of a plurality of solar cells are directly connected or connected by a connector. Also, a shunt resistor (PCN) is connected to the + and-ends of the serialized cells.
0.1Ω). Then, a voltage across the shunt resistor is obtained from the resistance value of the shunt resistor and the current flowing therethrough, and the voltage value is detected as a signal of the sensor.

As the solar cell as the sensor of this embodiment, either a crystalline or amorphous (including microcrystalline) silicon solar cell can be used.

The sensor may be any sensor that can use a solar cell in particular and that can detect that a human approaches the solar cell array and that can output a signal.

Connection box 4 incorporating switch 13 for photovoltaic power generation system, backflow prevention diode 14 and main switch 15
5 is a Canon junction box BX-02, and the solar inverter 17 is a Canon SI-04. Also,
As a switch 16 for short-circuiting or opening between terminals of the array, a DC electromagnetic contactor (DUD-A30, manufactured by Mitsubishi) was used. The solar inverter 17 is connected to a commercial AC system 18 of a house switchboard.

The solar cell of this embodiment may be of a crystalline type or an amorphous type (including microcrystals). In the present embodiment, all the strings of the photovoltaic power generation system pointed to true south with an inclination angle of 24.2 °. As shown in FIG. 14, the solar cell string of the present embodiment has a string 11a, a string 11b, and a string 11
c.

Shunt resistors R1 to R6 are used as current detecting means for detecting the output current of the sensor (solar cell). From the resistance values of the shunt resistors R1 to R6 and the current flowing therethrough, voltages at both ends of the shunt resistors R1 to R6 are obtained and set as C1 to C6, respectively, and these are converted into analog / digital converters 41 (manufactured by Microscience, ADM).
-676 PCI) to measure the signal of the sensor. Further, as the current detecting means for detecting the current of the sensor, other means such as detection by a clamp ammeter may be used in addition to the shunt resistance. Analog / digital conversion 4
PC 42 (Fujitsu FMV-5133)
D6).

The switch control device 44 for controlling the switch 16 of the array includes a personal computer 42 as shown in FIG.
Digital output 43 (Contec DA12-16)
Through the photocoupler of the switch control device 44 via an external DC power supply (AHC-100, manufactured by Asia Electronics).
-24S) is turned on / off to control the supply and stop of the voltage for opening and closing the DC electromagnetic contactor to the switch 16.

The operating current of the sensor (photovoltaic cell) was measured as a voltage value when no shadow was cast on the sensor (photovoltaic cell) and when the solar radiation intensity was sufficient or when the solar radiation intensity was close to 1000 W / m ^2. (Hereinafter, referred to as “standard state current signal value”). The derivation of the standard state current signal value is performed as follows.

First, a reference operating current value is measured in the above-mentioned sensor (solar cell). In particular,
Check that there are no obstacles around the solar power generation system.
The magnitude of the current flowing through each sensor in a state close to 00 W / m ² is measured.

Then, the voltage between both ends of the shunt resistors R1 to R6 is calculated from the resistance value of the shunt resistor and the magnitude of the current flowing therethrough, and the respective voltage values are used as standard state current signal values as follows.

Standard state current signal value of sensor 12a = Cpms1 Standard state current signal value of sensor 12b = Cpms2 Standard state current signal value of sensor 12c = Cpms3 Standard state current signal value of sensor 12d = Cpms4 Standard state current signal of sensor 12e Value = Cpms5 Standard state current signal value of sensor 12f = Cpms6

The following reference initial set values were used as set values for calculation in the control method of the photovoltaic power generation system of the present embodiment.

(1) Sensor current comparison reference value D0 = 0.9 (2) Measurement interval T = 1 second (3) Judgment start reference value S = 0.005 (4) Alarm output reference time T0 = 5 seconds (5) ) Standard state current signal value Cpms1 of sensor 12a =
0.228 (6) Standard state current signal value Cpms2 of sensor 12b =
0.225 (7) Standard state current signal value Cpms3 of sensor 12c =
0.226 (8) Standard state current signal value Cpms4 of sensor 12d =
0.225 (9) Standard state current signal value Cpms5 of sensor 12e =
0.224 (10) Standard state current signal value Cpms6 of sensor 12f
= 0.225

From the standard state current signal value of the above sensor,
The variation of the current of each sensor can be corrected.

FIG. 18 shows a flowchart of the control method of this embodiment.

First, a determination start reference value S is set (step S52), and shunt resistors R1 to R are used as current detecting means for detecting the operating current of the sensor (solar cell).
6 is used. The voltage across the shunt resistors R1 to R6 is obtained from the detected operating current and the resistance value of the shunt resistor through which the current flows, and these voltages are defined as C1 to C6, respectively (the operating current of the sensor is converted into a voltage value and detected. ). C1 to C6 are analog / digital at constant intervals T (the measurement interval in this embodiment is 1 second).
Input to the digital conversion 41 (step S53). Subsequently, the following A1 is calculated using the measured voltages C1 to C6.
ＡA6 (Ax; x = 1 to 6) is calculated to normalize the output signal value of the sensor (step S54).

A1 = C1 / Cpms1 A2 = C2 / Cpms2 A3 = C3 / Cpms3 A4 = C4 / Cpms4 A5 = C5 / Cpms5 A6 = C6 / Cpms6

A1 to A6 (Ax; x = 1 to 6)
Is larger than the determination start reference value S,
The following sensor comparison calculation is performed based on A1 to A6 (step S57). [Comparison Calculation of Sensors] D = (minimum value of A1 to A6) / (maximum value of A1 to A6)

If all of A1 to A6 are smaller than the determination start reference value S, the sensor comparison calculation is not performed, and after a measurement interval T (step 55), the process returns to step 53.

In this embodiment, a solar cell is used as a sensor, and when there is no sunshine at night or when the sunshine is weak, a judgment start reference value S is provided to provide an unnecessary alarm output and an unnecessary short circuit of the solar cell array. Can be prevented from malfunctioning. In other words, when there is no danger to the photovoltaic power generation system, such as when there is no sunshine at night or when the sunshine is weak and the signal of the sensor is small, the output of the sensor composed of solar cells also decreases and automatically stops, By using two combinations of the photovoltaic cell as the sensor and the judgment start reference value, it is possible to ensure sufficient safety with a simple configuration and with less malfunction.

In addition, since the solar cell is used as a sensor while ensuring sufficient safety, there is also a unique effect that does not require a separate power supply or energy for operating the sensor. In other words, when there is no danger to the photovoltaic power generation system, such as when there is no solar radiation at night or when the solar radiation is weak and the sensor signal is small, it is necessary to effectively use the feature that there is no need to generate an alarm or short-circuit the array. Can be done.

Next, when the calculated value D is smaller than the sensor current comparison reference value D0 (0.9 in this embodiment) (step S510), an alarm is first output (step S51).
1). Here, for example, an alarm is issued on the screen of the personal computer 42. Instead of displaying the warning on the screen of the personal computer, a separate alarm device may be used.

As described above, in the present embodiment, the measurement of the current signal of the sensor and the calculation based on the measurement are performed, and the signal values of the sensors are compared. And judge.

Then, the current signal of each of the above sensors is repeatedly measured at a constant interval T (1 second in this embodiment), a comparison calculation of the sensors is performed, and an alarm output reference time T0 is set.
If D is less than or equal to the sensor current comparison reference value A0 (5 seconds in this embodiment) or more (step S512), the switch control device 4 is transmitted from the personal computer 42 via the digital output 43.
4, the external DC power supply is switched, a voltage is supplied to the switch 16 of the DC electromagnetic contactor, the switch 16 is short-circuited, and the array is short-circuited (step S514).

The open / close of the switch 16 of the DC electromagnetic contactor for short circuit is held until the operation is performed. The release operation may be manual or automatic.

Example 7 Example 7 is the same as Example 6 except that the photovoltaic power generation system is controlled based on the flowchart shown in FIG.

That is, in the seventh embodiment, when the calculated value D is smaller than the sensor current comparison reference value D0 (step 510).
The array is short-circuited without outputting an alarm (step 6).
11) is different from the sixth embodiment. Even with such a configuration, it is possible to prevent an electric shock and to ensure safety while preventing a malfunction such as an unnecessary short circuit of the solar cell array.

By outputting an alarm (FIG. 1)
8, the configuration of the sixth embodiment is more preferable in that a sudden stop of power generation can be prevented.

Example 8 This example is an example of the method for controlling the photovoltaic power generation system of the present invention shown in FIGS. 20 to 22 as described in the third embodiment.

The photovoltaic power generation system according to the present embodiment is based on the configuration of the photovoltaic power generation system according to Embodiment 6A. The sensors are disposed not only around the array but also around the string as shown in FIGS. Is installed. Then, the short-circuit condition described in the sixth embodiment is not used to short-circuit the array of the photovoltaic power generation system, but to short-circuit only the string corresponding to the sensor that has detected the shadow.

In the solar power generation system of this embodiment, sensors (12a to 12n) are provided around the strings of the solar cells. As the sensor, a sensor composed of solar cells as shown in FIG. 16 of Example 6 was produced.

The voltage C1 across the shunt resistors R1 to R14
To C14 are input to the analog / digital converter 41, and the operating current of the sensor (solar cell) is detected as a voltage value.

The following reference initial set values were used as set values for calculation in the control method of the solar cell array of this embodiment.

(1) Sensor current comparison reference value D0 = 0.9 (2) Measurement interval T = 1 second (3) Judgment start reference value S = 0.005 (4) Alarm output reference time T0 = 5 seconds (5) ) Standard state current signal value Cpms1 of sensor 12a =
0.228 (6) Standard state current signal value Cpms2 of sensor 12b =
0.225 (7) Standard state current signal value Cpms3 of sensor 12c =
0.226 (8) Standard state current signal value Cpms4 of sensor 12d =
0.225 (9) Standard state current signal value Cpms5 of sensor 12e =
0.224 (10) Standard state current signal value Cpms6 of sensor 12f
= 0.225 (11) Standard state current signal value Cpms7 of sensor 12g
= 0.228 (12) Standard state current signal value Cpms8 of sensor 12h
= 0.225 (13) Standard state current signal value Cpms9 of sensor 12i
= 0.226 (14) Standard state current signal value Cpms1 of sensor 12j
0 = 0.225 (15) Standard state current signal value Cpms1 of sensor 12k
1 = 0.224 (16) Standard state current signal value Cpms1 of sensor 12l
2 = 0.225 (17) Standard state current signal value Cpms1 of sensor 12m
3 = 0.225 (18) Standard state current signal value Cpms1 of sensor 12n
4 = 0.225

FIG. 23 shows a flowchart of the control method of this embodiment.

First, a determination start reference value S is set (step S92), and shunt resistors R1 to R are used as current detecting means for detecting the operating current of the sensor (solar cell).
14 is used. The voltage across the shunt resistors R1 to R14 is obtained from the detected operating current and the resistance value of the shunt resistor through which the current flows, and these voltages are defined as C1 to C14, respectively (the operating current of the sensor is converted into a voltage value and detected. ). C1
C14 is input to the analog / digital converter 41 at a constant interval T (the measurement interval in this embodiment is 1 second) (step S93). Subsequently, the following A1 to A14 (Ax; x = 1 to 14) are calculated using the measured both-end voltages C1 to C14, and the output signal value of the sensor is normalized (step S94).

A1 = C1 / Cpms1 A2 = C2 / Cpms2 A3 = C3 / Cpms3 A4 = C4 / Cpms4 A5 = C5 / Cpms5 A6 = C6 / Cpms6 A7 = C7 / Cpms7 A8 = C8 / Cpm9 C10 / Cpms10 A11 = C11 / Cpms11 A12 = C12 / Cpms12 A13 = C13 / Cpms13 A14 = C14 / Cpms14

A1 to A6 are sensors 12c, 12d, 12e and 12 provided around the string 11a.
f, 12m, 12n (Shunt resistances R1 to R6
). A5 to A10 are
Sensors 12b, 1 provided around the string 11b
It is calculated based on the measured values of 2n, 12m, 12g, 12k, and 12l (voltages across the shunt resistors R5 to R10). A9 to A14 are sensors 12a, 12k, 121, 12h, 12i, provided around the string 11c.
It is calculated based on the measured value of 12J (the voltage across the shunt resistors R5 to R10).

A1 to A14 (Ax; x = 1 to 1)
If at least one of 4) is larger than the determination start reference value S, the strings 11a, 11a are determined based on A1 to A14.
b, 11c, the following sensor comparison calculation D
y (Dy; y = 1 to 3) is performed (step S97). [Comparison calculation of sensor of string 11a] D1 = (minimum value of A1 to A6) / (maximum value of A1 to A6) [Comparison calculation of sensor of string 11b] D2 = (minimum value of A5 to A10) / (A5 D3 = (minimum value of A9 to A14) / (maximum value of A9 to A14)

If all of A1 to A14 are smaller than the determination start reference value S (step 95), the sensor comparison calculation is not performed, and after a measurement interval T (step 96), the process returns to step 93.

If at least one of the calculated values Dy (Dy; y = 1 to 3) is smaller than the sensor current comparison reference value D0 (0.9 in this embodiment) (step S98), the target string (comparison reference An alarm of a string corresponding to the comparison calculated value D smaller than the value D0 is output (step S911). For example, when D1 is smaller than D0, an alarm is issued on the screen of the personal computer 42 for the string 11a corresponding to the comparison calculation value D1. Instead of outputting an alarm on the screen of the personal computer, an alarm device may be separately used.

If all of the comparison calculated values D1 to D3 are larger than the sensor current comparison reference value D0 (step 98), after the measurement interval T (step 99), the alarm is released (step 910). If there is a short-circuited string, the alarm for strings other than the short-circuited string is released (step 91).
0).

Subsequently, the above-described sensor current signals are repeatedly measured at a constant interval T (1 second in this embodiment), a comparison calculation D of the sensors is performed, and the alarm output reference time T0 is set.
If at least one of D1 to D3 is smaller than the sensor current comparison reference value D0 even for more than (5 seconds in this embodiment), a digital output 43 is transmitted from the personal computer 42, and based on the digital output 43, the target string ( The photocoupler of the switch control device 44 for the string (corresponding to the comparison calculation value D smaller than the comparison reference value D0) is energized to perform switching of the external DC power supply and supply voltage to the switch 61 of the DC electromagnetic contactor. Then, the switch 61 is short-circuited, and the target string is short-circuited (step S91).
4).

If the alarm output time is less than the reference value T0, the measurement interval T passes (step 913), and step 9
Return to 3.

If there is a string that is not short-circuited (step 916), the process returns to step 93 after a measurement interval T (step 915).

When all strings are short-circuited (step 916), the process ends (step 917).

The release of the opening and closing of the switch 61 of the DC electromagnetic contactor for short-circuiting is maintained until an operation is performed.
The release operation may be manual or automatic.

Ninth Embodiment A ninth embodiment is the same as the eighth embodiment except that the solar power generation system is controlled based on the flowchart shown in FIG. That is, in the ninth embodiment, when at least one of the calculated values D1 to D3 is smaller than the sensor current comparison reference value D0 (step 98),
The eighth embodiment is different from the eighth embodiment in that a target string (a string corresponding to a comparison calculation value Dy smaller than the comparison reference value D0) is short-circuited (step 1011) without outputting an alarm. With such a configuration, electric shock can be prevented and safety can be ensured while preventing malfunction such as unnecessary short-circuiting of the solar cell string. Further, since only the target string is short-circuited, power can be obtained from the remaining strings.

By outputting an alarm (see FIG. 2)
3, the configuration of the eighth embodiment is more preferable in that a sudden stop of power generation can be prevented.

[0158]

As described above, the detection means for detecting that an intruder has entered the restricted access area including the area where the solar cell module is installed is provided, and the detection means outputs the signal by detecting the intruder. According to the photovoltaic power generation system and the control method of the photovoltaic power generation system of the present invention for preventing an intruder from receiving an electric shock by activating a predetermined electric shock prevention means activated by a signal to perform an intruder detection, Such an intruder can be prevented from an electric shock. In addition, since the time from detection of an intruder to security measures is almost the same, security can be further improved, and there is no need for constant monitoring by an administrator or related parties. Thus, the cost can be reduced.

The output signal of one or more sensors arranged around the solar cell array or around each string of the solar cell array is detected, and based on this output signal, the output terminal of each solar cell array or string is detected. According to the control method of the photovoltaic power generation system of the present invention, which controls a switch for short-circuiting, when it is determined from the output signal of the sensor that a local part of the array has been detected, switching between the array or string terminals is performed. By controlling the heater, electric shock accidents due to short circuit of the array or string and human contact with the insulation defect such as breakage of the surface coating material of the solar cell module, surface glass breakage, scratches, deformation, etc. are prevented. can do.

Further, by comparing the signals of the respective sensors with each other, it is possible to prevent an electric shock accident while preventing an erroneous operation such as an unnecessary alarm output or an unnecessary short circuit of the solar cell array.

[0161]

[Brief description of the drawings]

FIG. 1 is a layout diagram of a photovoltaic power generation system according to a first embodiment of the present invention.

FIG. 2 is a layout diagram of the photovoltaic power generation system according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of the photovoltaic power generation system according to the first embodiment of the present invention.

4A and 4B are diagrams illustrating a solar cell module used in the solar power generation system according to the first embodiment of the present invention, wherein FIG. 4A is a configuration diagram of the solar cell module, and FIG. FIG. 3C is a circuit diagram when the operation is performed, and FIG. 3C is a circuit diagram when the solar cell string is short-circuited.

FIG. 5 is a cross-sectional view of the solar cell module used in the solar power generation system according to the first embodiment of the present invention.

FIG. 6 is a layout diagram of a photovoltaic power generation system according to a second embodiment of the present invention.

FIG. 7 is a circuit diagram of a photovoltaic power generation system according to Embodiment 2 of the present invention.

FIG. 8 is a layout diagram of a photovoltaic power generation system according to a third embodiment of the present invention.

FIGS. 9A and 9B are diagrams illustrating a solar cell module used in a solar power generation system according to a third embodiment of the present invention. FIG. 9A is a configuration diagram of the solar cell module, and FIG. FIG. 3C is a circuit diagram when the operation is performed, and FIG. 3C is a circuit diagram when the solar cell string is short-circuited.

FIG. 10 is a layout diagram of a photovoltaic power generation system according to Embodiment 4 of the present invention.

11A and 11B are diagrams showing a solar cell module used in a solar power generation system according to Example 4 of the present invention, wherein FIG. 11A is a configuration diagram of the solar cell module, and FIG. FIG. 3C is a circuit diagram when the operation is performed, and FIG. 3C is a circuit diagram when the solar cell string is short-circuited.

FIG. 12 is a circuit diagram of a photovoltaic power generation system according to Embodiment 5 of the present invention.

FIG. 13 is a configuration diagram of a solar cell module used in a solar power generation system according to Embodiment 5 of the present invention.

FIG. 14 is a configuration diagram of a solar power generation system according to Embodiment 2 and Example 6 of the present invention.

FIG. 15 is a configuration diagram of a roof of a photovoltaic power generation system according to Embodiment 2 and Example 6 of the present invention.

FIG. 16 is an explanatory diagram of a human shadow sensor in the photovoltaic power generation system according to Embodiment 2 and Example 6 of the present invention.

FIG. 17 is an explanatory diagram of a control method of the photovoltaic power generation system according to the second embodiment and Example 6 of the present invention.

FIG. 18 is a flowchart illustrating a method for controlling a photovoltaic power generation system according to Embodiment 6 of the present invention.

FIG. 19 is a flowchart illustrating a method for controlling a photovoltaic power generation system according to Embodiment 7 of the present invention.

FIG. 20 is a configuration diagram of a photovoltaic power generation system according to Embodiment 3 and Example 8 of the present invention.

FIG. 21 is a configuration diagram of a roof of a photovoltaic power generation system according to Embodiment 3 and Example 8 of the present invention.

FIG. 22 is an explanatory diagram of a control method of the photovoltaic power generation system according to the third embodiment and Example 8 of the present invention.

FIG. 23 is a flowchart illustrating a method for controlling the photovoltaic power generation system according to the eighth embodiment of the present invention.

FIG. 24 is a flowchart illustrating a method for controlling a photovoltaic power generation system according to Embodiment 9 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Solar cell array 11a, 11b, 11c Solar cell string 12 Sensor 13 String output end switch 14 Backflow prevention diode 15 Main switch 16 Array short-circuit switch 17 Solar inverter 18 Commercial AC system 19 Current signal detection device 21 Building roof 31 Solar cell 32 connector 41 digital / analog conversion 42 personal computer 43 digital output 44 switch control device 45 connection box 61 string short-circuit switch 101, 206, 506, 606, 804, 1001
Photovoltaic power generation system 102, 201, 501, 601, 801 Solar cell installation area 103, 202, 502, 602, 802 Restricted access area 104 Intrusion prevention means 105 Intruder detection means 106, 205, 505, 605, 803 Building 110 signal Processing / comparison unit 111 Control unit 112 Alarm / display 203 Wall 204 Door 207, 508 Solar cell string 208, 510, 1006 Connection box 209, 509, 704 Relay switch 210, 511, 1007 Inverter 211 Sensor 301, 507, 701, 901 , 1002, 1101
Solar cell module 302 Amorphous silicon type solar cell 303, 703, 903, 1102 Back reinforcing plate 304 Adhesive protection film 305, 1103 Insulating sheet 306 Interconnector 307, 706, 906 Silicon sealant 308, 508, 704, 904 Relay switch 503a, 503b , 603 Fence 504, 507 Vibration sensor 604 Groove 702, 902, 1104 Solar cell 705, 905, 1105 Covering material 707, 1008 Signal 1003 Open switch 1004 Proximity sensor 1005 Blocking diode 1106 Lead wire R1 to R14 Shunt resistance

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Meiji Takabayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (72) Inventor Ayako Shiomi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside (72) Inventor Takaaki Mukai 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Rim Chinchou 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. F Terms (reference) 5C086 AA22 AA53 BA20 BA30 CA01 CA08 CA11 CA19 CA21 CB01 CB07 CB15 CB40 DA14 DA40 EA50 5F051 KA06 KA07 KA08 KA10

Claims (46)

[Claims] 1. A photovoltaic module, a restricted access area including an area where the photovoltaic module is installed, and detection means for detecting that an intruder has entered the restricted access area and outputting a signal, A photovoltaic power generation system, comprising: an electric shock prevention unit that is activated by a signal output by the detection unit. 2. The solar power generation system according to claim 1, further comprising means for preventing an intruder from entering the restricted access area. 3. The means for preventing an intruder from invading:
The photovoltaic power generation system according to claim 2, wherein the photovoltaic power generation system is a fence, a fence, a fence or a groove. 4. The means for preventing the intruder from invading is
The photovoltaic power generation system according to claim 2, wherein the photovoltaic power generation system is provided in a double manner. 5. The detecting means according to claim 4, wherein the means for preventing intrusion of an inside intruder among the means for preventing intrusion of the double intruder is provided. Solar power system. 6. The method according to claim 1, wherein the detecting unit is any one of a proximity sensor, an optical sensor, a magnetic sensor, a magnetic sensor, a temperature sensor, a humidity sensor, an impact sensor, an acceleration sensor, a weight sensor, a current sensor, and an electromagnetic wave sensor. The photovoltaic power generation system according to any one of claims 1 to 5, wherein 7. The device according to claim 1, wherein the electric shock prevention unit is a unit that short-circuits the solar cell module or a solar cell string formed by connecting a plurality of the solar cell modules. A photovoltaic power generation system according to item 1. 8. The electric shock prevention means includes a circuit breaker, which disconnects and invalidates the solar cell module or the solar cell string from a solar power generation system. The photovoltaic power generation system according to claim 7. 9. The photovoltaic power generation system according to claim 7, wherein there are at least two photovoltaic strings, which are connected in parallel with each other. 10. The electric shock prevention means has a function of canceling an electric shock prevention function.
A solar power generation system according to any one of the above. 11. The solar cell module according to claim 1, wherein the photovoltaic element provided on the outermost surface on the light receiving surface side is installed so as to directly contact the atmosphere. Solar power system. 12. The solar cell module according to claim 1, wherein the solar cell module has a coating material only on the outermost surface on the light receiving surface side.
The solar power generation system according to any one of claims 10 to 10. 13. The photovoltaic power generation system according to claim 1, wherein at least one of said photovoltaic modules is coated on a light receiving surface side. 14. The solar power generation system according to claim 1, wherein a part of a live part is exposed.
A solar power generation system according to any one of the above. 15. A solar cell module, a restricted access area including an area where the solar cell module is installed,
What is claimed is: 1. A method for controlling a photovoltaic power generation system, comprising: detection means for detecting that an intruder has entered the restricted area; and electric shock prevention means, wherein the detecting means detects that an intruder has entered the restricted area. The method for controlling a photovoltaic power generation system according to claim 1, wherein the electric shock prevention means is operated based on a signal detected and outputted. 16. The method according to claim 15, further comprising means for preventing an intruder from entering the restricted access area. 17. The means for preventing an intruder from intruding,
The method according to claim 16, wherein the control method is a fence, a fence, a fence, or a groove. 18. The means for preventing an intruder from intruding,
The control method for a photovoltaic power generation system according to claim 16 or 17, wherein the photovoltaic power generation system is provided doubly. 19. The detecting means according to claim 1, wherein said means for preventing intrusion of an inside intruder among said means for preventing intrusion of a double intruder is provided.
9. The method for controlling a photovoltaic power generation system according to item 8. 20. A method according to claim 20, wherein said detecting means is any one of a proximity sensor, an optical sensor, a magnetic sensor, a magnetic sensor, a temperature sensor, a humidity sensor, an impact sensor, an acceleration sensor, a weight sensor, a current sensor, and an electromagnetic wave sensor. The control method for a photovoltaic power generation system according to any one of claims 15 to 19, wherein: 21. The apparatus according to claim 15, wherein the electric shock prevention means is means for short-circuiting the solar cell module or a solar cell string in which the solar cell modules are connected in series. A method for controlling a photovoltaic power generation system according to any one of the above. 22. The electric shock prevention means includes a circuit breaker, which disconnects and invalidates the solar cell module or the solar cell string from a photovoltaic power generation system. The method for controlling a photovoltaic power generation system according to claim 21. 23. The control method for a photovoltaic power generation system according to claim 21, wherein there are at least two solar cell strings, which are connected in parallel with each other. 24. The electric shock prevention means according to claim 1, further comprising a function of releasing the electric shock prevention means.
24. The control method for a photovoltaic power generation system according to any one of 5 to 23. 25. A solar cell array formed by connecting a plurality of solar cell modules, one or more sensors arranged around the solar cell array, and an output terminal of the solar cell array being short-circuited. A control method for a photovoltaic power generation system, comprising: a switch that causes the output terminal to be short-circuited based on an output signal of the sensor. 26. The output terminal is short-circuited when an output signal of the sensor is equal to or less than a predetermined value.
6. The control method of the photovoltaic power generation system according to 5. 27. The method according to claim 25, wherein an alarm is output before the output terminal is short-circuited. 28. The photovoltaic power generation system according to claim 25, wherein when the output signal of the sensor is equal to or less than a predetermined value, an alarm is generated and the output terminal is short-circuited after a predetermined time has elapsed. Control method. 29. The control method for a photovoltaic power generation system according to claim 25, wherein the short-circuit state of the output terminal is maintained until a release operation is performed. 30. A plurality of solar cell strings formed by connecting a plurality of solar cell modules, a plurality of sensors arranged around each of the plurality of solar cell strings, and each of the plurality of solar cell strings. A plurality of switches that short-circuit the output terminals of the plurality of switches, wherein the plurality of solar cell strings are connected in parallel, and the plurality of solar cell strings are connected based on output signals of the plurality of sensors. A control method for a photovoltaic power generation system, wherein an output terminal is short-circuited for each solar cell string. 31. An output terminal of a solar cell string corresponding to a sensor that outputs an output signal of a predetermined value or less when a part of output signals of the plurality of sensors is equal to or less than a predetermined value. A method for controlling a photovoltaic power generation system according to claim 30. 32. The method according to claim 30, wherein an alarm is output before the output terminal is short-circuited. 33. When the output signal of some of the plurality of sensors is equal to or less than a predetermined value, an alarm is generated, and thereafter, when a predetermined time elapses, the sun corresponding to the sensor that has output the output signal equal to or less than the predetermined value. The method according to claim 30, wherein an output terminal of the battery string is short-circuited. 34. The control method for a photovoltaic power generation system according to claim 30, wherein the short-circuit state of the output terminal of the short-circuited solar cell string is maintained until a release operation is performed. 35. The solar cell module according to claim 15, wherein the photovoltaic element provided on the outermost surface on the light receiving surface side is installed so as to directly contact the atmosphere. Control method of photovoltaic power generation system. 36. The solar cell module according to claim 1, wherein the solar cell module has a covering material only on the outermost surface on the light receiving surface side.
35. The control method for a photovoltaic power generation system according to any one of 5 to 34. 37. The control method for a photovoltaic power generation system according to claim 15, wherein at least one light receiving surface of each of the solar cell modules is covered. 38. The solar power generation system according to claim 15, wherein a part of a live part is exposed.
8. The method for controlling a photovoltaic power generation system according to any one of 7. 39. A solar cell string formed by connecting a plurality of solar cell modules, a plurality of sensors provided around the solar cell string, and the solar cell based on output signals of the plurality of sensors. In a control method for a photovoltaic power generation system having a switch for short-circuiting an output end of a string, a first step of measuring output signals of the plurality of sensors, and a second step of normalizing a value of the output signal And at least one of the plurality of normalized output signal values Ax is
If the reference value S is larger than the reference value S, the comparison calculation value D is compared with the comparison calculation value D = (the plurality of standardized output signal values Ax
A third value obtained from (minimum value) / (maximum value of the plurality of standardized output signal values Ax), and when the comparison calculation value D is smaller than a comparison reference value D0, the output is output by the switch. And a fourth step of short-circuiting the ends. 40. The control method according to claim 39, wherein an alarm is output before the output terminal is short-circuited. 41. The output time of the alarm is a reference time T0.
The method according to claim 40, wherein when the length is longer, the output terminal is short-circuited by the switch. 42. The control method for a photovoltaic power generation system according to claim 39, wherein the sensor comprises a solar cell. 43. A solar cell string formed by connecting a plurality of solar cell modules, wherein a plurality of sensors provided around the solar cell string and an opening and closing for short-circuiting an output terminal of the solar cell string. In a method for controlling a photovoltaic power generation system in which a plurality of photovoltaic strings having a plurality of photovoltaic strings are connected in parallel, (1) a method of measuring output signals of the plurality of sensors for each of a plurality of photovoltaic strings Step 1, a second step of normalizing the value of the output signal, and when at least one of the plurality of normalized output signal values Ax is larger than the reference value S, the comparison calculation value Dy is calculated. Value Dy = (the plurality of normalized output signal values A
x minimum value / (the plurality of standardized output signal values Ax)
(2) a comparison calculation smaller than the comparison reference value D0 when at least one of the comparison calculation values Dy of the plurality of solar cell strings is smaller than the comparison reference value D0. Performing a fourth step of short-circuiting the output end of the solar cell string corresponding to the value Dy by a switch. 44. The method according to claim 43, wherein an alarm is output for the solar cell string before the output terminal of the solar cell string corresponding to the comparison calculated value Dy smaller than the comparison reference value D0 is short-circuited. Control method of solar power generation system. 45. The output time of the alarm is a reference time T0.
The control method of the photovoltaic power generation system according to claim 44, wherein when the length is longer, the output terminal of the solar cell string corresponding to the comparison calculated value Dy smaller than the comparison reference value D0 is short-circuited. 46. The control method for a photovoltaic power generation system according to claim 43, wherein the sensor comprises a solar cell.