JP3760125B2 - Solar power system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention enables each customer to receive AC power from a power company line when operating a common solar power generation system linked to the power company line system. It relates to the adjustment of the distribution of photovoltaic power to the house.
[0002]
[Prior art]
In recent years, solar power generation has been gaining popularity as a result of the fact that it has been in the spotlight as a clean power generation means and that a power company has been able to purchase a surplus power.
[0003]
FIG. 3 shows an example of a system for that purpose. The generated power of the solar power generation unit 10 constituted by a series circuit of the solar panel 1, the diode 2 and the switch 3 is led to the consumer unit 20, where it is converted into alternating current by the inverter 4 and then the power company's It is connected to the line 8 and supplied to the customer 5. Here, the diode 2 is a rectifier for blocking a reverse current from the inverter 4, and the switch 3 is a switch for turning on the solar panel 1. Further, between the electric power company line 8 and the inverter 4, there are a power selling integrated wattmeter 6 and a power purchasing integrated wattmeter 7.
[0004]
In the above-described system, the customer 5 exclusively consumes the purchased power from the power company 8 at night when solar power generation is not performed. Further, even during the daytime when solar power generation is performed, if the power consumption of the customer 5 is larger than the solar power generation power, the shortage is purchased by the power purchased from the power company, and conversely the power consumption of the customer 5 Is less than solar power, surplus power is sold to the power company's line 8.
[0005]
Then, the purchased power amount is integrated into the purchased power wattmeter 7, and the sold power amount is integrated into the sold power wattmeter 6. Normally, the meter is read once a month, and the power trading amount is settled based on the instructions of these instruments.
[0006]
[Problems to be solved by the invention]
As described above, conventionally, an electric power company normally enters into an electric power sales contract with an individual customer. Recently, however, there have been demands for several nearby customers to jointly install solar power generation facilities, or to install solar power generation facilities in apartment buildings and operate them jointly. The company may not be able to limit the other party to a single customer, and there may be differences in the degree of contribution between the customers in terms of provision of facilities and the burden of funding. In other cases, power generation facilities cannot be used.
[0007]
Accordingly, an object of the present invention is to distribute generated power according to usage conditions and eliminate unfairness among consumers when the usage conditions of photovoltaic power generation are different among a plurality of consumers. To do.
[0008]
[Means for Solving the Problems]
In the present invention, each of a plurality of consumers purchases and uses power from a power company line via a power meter for power purchase. A solar power generation unit and a power meter for measuring the generated power are provided in common for these consumers, and an inverter that converts the power into alternating current for each consumer, and surplus alternating power is converted into the above power A watt-hour meter for selling power to be sent to the company line is provided. And the means to determine the power distribution amount to each consumer based on the photovoltaic power generated by the power meter, and the power respectively converted by the inverters based on the determined distribution amount Means for controlling.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Regarding the distribution of photovoltaic power, a method of always allocating at a predetermined ratio according to the degree of contribution to the installation of equipment and the investment ratio is conceivable. However, when there is little generated power in the morning and evening or in bad weather, it is meaningless and technically difficult to distribute power to all customers, so it is only allocated to some selected customers. Alternatively, it may be distributed to consumers who have not been allocated when sufficient power generation is performed. In addition, since the settlement of charges with electric power companies is usually done every month, even if the allocation is intermittent, an allocation method that eliminates unfairness in one month may be used, and further injustice in a certain month Even if it occurs, a distribution method may be used in which it is carried over to the next month and cleared.
[0010]
As means for controlling the distribution of the generated power to each consumer based on the determined ratio, there are various means such as intermittent connection of the gate signal for controlling the inverter, adjustment of the phase, or duty cycle.
[0011]
[Example 1]
In FIG. 1, reference numeral 10 denotes a solar power generation unit shared by a plurality of consumers 5 a, 5 b, 5 c,... 5 n, and includes a solar panel 1, a reverse current blocking diode 2, and a switch 3. . The output of the photovoltaic power generation unit 10 is measured by the power meter 9 and then reaches the distribution bus 11 where it branches off and passes through the distributors 4a, 4b, 4c,. .., 5n, and a power selling integrated wattmeter 6a, 6b, 6c... 6n and a power purchasing integrated wattmeter 7a, 7b, 7c. ... coupled to the power company line 8 via 7n.
[0012]
Since all of the distributors 4a, 4b, 4c,..., 4n have the same configuration, the distributor 4a will be described. The input from the distribution bus 11 is connected to the customer 5a via the power meter 12 and the inverter 13. Heading to. The inverter 13 is controlled to be turned on / off or controlled by the intermittent controller 14 or the time width controller 15.
[0013]
Reference numeral 16 denotes a distribution power determination unit for each consumer. The total generated power measured by the power meter 9 is set in advance for each customer measured by the power meter 12 and for each consumer. The intermittent controller 14 and the time width controller 15 are controlled so that the inverter 13 operates in accordance with the distribution condition.
[0014]
In the above-described apparatus, since the photovoltaic power generation unit 10 does not generate power at night, the power meter 9 does not measure power, and the intermittent controller 14 in the distributors 4a, 4b, 4c,. The inverter 13 is controlled to be in a cut-off state by a command from the determination unit 16.
[0015]
In the morning and evening or in cloudy weather, the generated power measured by the power meter 9 is quite small. In this case, the distributed power determination unit 16 sends a command to the intermittent controller 14 for a part of the distributors 4a, 4b, 4c,. For other consumer distributors, a command is sent to the time width controller 15 so that the inverter 13 is opened for a predetermined time width and converted to AC.
[0016]
During the daytime weather, the solar power generation unit 10 generates a large amount of power, which is measured by the power meter 9. Then, the allocated power determining unit 16 determines the allocated power to each consumer according to a predetermined condition, and the time width controller 15 in each consumer's distributors 4a, 4b, 4c,. A command is sent to control the inverter 13, and AC power is supplied to each consumer 5a, 5b, 5c,. If there is a surplus in the power supplied from the distributors 4a, 4b, 4c,..., 4n, each customer sells the power toward the power company line.
[0017]
[Example 2]
FIG. 2 shows an embodiment different from that in FIG. 1, and in each distributor 5a, 5b, 5c,..., 5n, the power controller 17 is connected to the inverter 13 in the distributors 4a, 4b, 4c,. This power controller 17 is controlled by the intermittent controller 14 or the DC controller 18 which operates according to the command of the distributed power determination unit 16 to control the DC power passing therethrough.
[0018]
The circuit shown in FIG. 2 controls power in the DC stage, whereas the circuit shown in FIG. 1 controls power in the DC to AC conversion stage. It is possible to use a general-purpose product that performs only.
[0019]
【The invention's effect】
As described above, according to the present invention, a plurality of customers who have signed a power purchase contract with an electric power company jointly install a solar power generation facility, and use the generated electric power and supply the electric power company to the electric power company. Surplus electricity can be sold fairly. Therefore, collective introduction of solar power generation by local communities and complex housing is possible, and by increasing the size of the power generation facilities, it is possible to efficiently install and operate them, so even if funds are scarce Participation becomes easy. Therefore, it can be installed on an arcade or on the roof or wall of a commercial building, especially in a commercial area, and can contribute to the promotion of the region.
[Brief description of the drawings]
FIG. 1 is a block diagram of one embodiment of a photovoltaic power generation system according to the present invention.
FIG. 2 is a block diagram of another embodiment of the photovoltaic power generation system according to the present invention.
FIG. 3 is a block diagram showing an example of a conventional solar power generation system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solar panel 2 Diode 3 Switch 4a-4n Distributor 5a-5n Consumer 6a-6n Electricity-integrated wattmeter 7a-7n Electricity-purchasing integrated wattmeter 8 Electric power company line 9 Electricity meter 10 Solar power generation part 11 Distribution bus 12 Power meter 13 Inverter 14 Intermittent controller 15 Time width controller 16 Distributed power determination unit 17 Power controller 18 DC controller 20 Customer part

Claims (4)

A solar power generation unit provided in common to a plurality of consumers who receive AC power supplied from the power company line, and the power generated by the solar power generation unit provided to each of these consumers is converted into AC power. An inverter to be supplied to each consumer; a power meter for measuring the generated power of the solar power generation unit; and means for determining a distribution amount of the generated power for each consumer based on the measured generated power A photovoltaic power generation system comprising: means for controlling the generated power supplied to the consumer through the inverters according to the distribution amount. 2. The photovoltaic power generation system according to claim 1, wherein the distribution amount of the generated power for each consumer is determined according to an equal or predetermined ratio. 2. The photovoltaic power generation system according to claim 1, wherein the distribution amount of the generated electric power for each consumer is determined so as to reach a predetermined amount in which the unfairness is resolved every predetermined period. 4. The photovoltaic power generation system according to claim 3, wherein the number of consumers to distribute the generated power is selected according to the generated power.

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