JP7362859B1 - Elevator equipment and elevator control method - Google Patents

Abstract

[Problem] To effectively utilize regenerated energy generated during power outage operation. [Solution] The elevator device of the embodiment includes a unidirectional first circuit that supplies power running energy from a storage battery to a motor during power outage operation, and a unidirectional first circuit that recovers regenerative energy generated from the motor to the storage battery. 2 circuit, after the start of power outage operation, the car is accelerated to the preset lower limit speed, and when the charging current of the storage battery is detected while operating at the lower limit speed, the regeneration mode is determined, and the regeneration mode is determined. , speed command generation means for re-accelerating from the lower limit speed, deeming the point at which the charging current of the storage battery reaches the maximum peak as the maximum regenerative power point, terminating the re-acceleration, and maintaining the operating speed at that time. . [Selection diagram] Figure 1

Description

Embodiments of the present invention relate to an elevator apparatus and an elevator control method.

Conventionally, in order to reduce the power consumption and load on storage batteries during power outage operation of elevators, the loads on the car and the counterweight were compared before the start of power outage operation, and if the car was heavier, it was moved downward, and the load on the counterweight was lowered. The direction of operation is determined depending on the load conditions, such as upwards if it is heavy, and basically power-out operation is performed in the regeneration direction.

In particular, in an elevator that has a high lift and has an express zone, the long power outage operation time increases the possibility that the storage battery capacity will run out midway and passengers will be trapped. Therefore, it is important to effectively utilize the regenerated energy generated by the motor during power outage operation.

Japanese Patent Application Publication No. 11-49449 Japanese Patent Application Publication No. 2001-240320

However, in the conventional technology, the regenerative energy generated by the motor during power outage operation is not effectively used because it is consumed as heat generated by energizing the regenerative resistor when the main circuit DC section voltage exceeds a predetermined voltage. There wasn't.

Therefore, an object of the embodiments of the present invention is to provide an elevator apparatus and an elevator control method that can effectively utilize regenerated energy generated during power outage operation.

The elevator apparatus of the embodiment has a main circuit configuration that can supply power to the motor from a storage battery connected to the DC part of the elevator main circuit when commercial power is interrupted due to a power outage, and a regenerative resistor that consumes regenerative energy generated by the motor. The circuit compares the loads of the car and the counterweight before starting the power outage operation, and if the car is heavier, the driving direction is downward, and if the counterweight is heavier, the driving direction is determined to be upward, and the power outage operation is started. an elevator control device that performs power running; a unidirectional first circuit that supplies power running energy from the storage battery to the motor; and a unidirectional first circuit that supplies power running energy from the storage battery to the motor, and recovers regenerative energy generated from the motor to the storage battery during a power outage operation. A unidirectional second circuit, and after the start of power outage operation, the car is accelerated to a preset lower limit speed, and when a charging current of the storage battery is detected while operating at the lower limit speed, the regeneration mode is determined. When the regeneration mode is determined, the system re-accelerates from the lower limit speed, and when the charging current of the storage battery reaches its maximum peak, it is regarded as the maximum regenerative power point, re-acceleration ends, and the operating speed at that time is changed. and speed command generation means for maintaining the speed command.

FIG. 1 is a diagram showing a system configuration in a first embodiment (power failure operation that maximizes regenerated power). FIG. 2 is a diagram showing a control sequence in the first embodiment. FIG. 3 is a diagram showing a system configuration in the second embodiment (power outage operation to prevent overspeeding). FIG. 4 is a diagram showing a control sequence in the second embodiment. FIG. 5 is a diagram showing a system configuration in the third embodiment (power failure operation to prevent charging overcurrent of storage battery). FIG. 6 is a diagram showing a control sequence in the third embodiment. FIG. 7 is a diagram showing a control sequence in the fourth embodiment (power outage operation). FIG. 8 is a diagram showing a system configuration related to power outage operation in the prior art. FIG. 9 is a diagram showing a control sequence in a power outage operation according to the prior art.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments (first to fourth embodiments) of an elevator apparatus and an elevator control method of the present invention will be described below with reference to the accompanying drawings. In order to facilitate understanding of the embodiments, the prior art will first be explained again.

(Conventional technology)
FIG. 8 is a diagram showing a system configuration related to power outage operation in the prior art. FIG. 9 is a diagram showing a control sequence in a power outage operation according to the prior art. In FIG. 9, each waveform is a representative waveform assuming a case where the load imbalance between the car 30 and the counterweight 31 is large.

When the commercial power supply 10 is cut off due to a power outage or the like, the elevator control panel 50 detects the power outage. Then, when the motor 17 operates as a generator by braking to generate regenerative energy in order to move the car 30 at the rated speed for power outage operation (FIG. 9(a)), the elevator control panel 50 transmits the Q7 gate signal. By outputting the output, the regenerative resistor switching element 15 is turned on (FIG. 9(d)), and the regenerative energy is thermally consumed by the regenerative resistor 14 (symbol E in FIG. 9(b)). As described above, in the conventional technology, there is no mechanism for charging the storage battery 20 using regenerative energy, and the regenerative energy generated during power outage operation cannot be effectively used.

Therefore, a technique that can effectively utilize regenerated energy generated during power outage operation will be described below. Note that from the second embodiment onwards, descriptions of matters similar to those of the previous embodiments will be omitted as appropriate.

(First embodiment)
In the first embodiment, a control method for power outage operation that can realize effective use of regenerative energy by charging a storage battery with the obtained regenerative energy while maintaining the speed at which the maximum regenerative power can be obtained will be described. .

FIG. 1 is a diagram showing a system configuration in a first embodiment (power failure operation that maximizes regenerated power). Note that in Figure 1, the lines (including arrows) connecting each configuration indicate the main connection relationships, and there are cases where configurations are connected to each other in areas without lines (Figure 3, The same applies to Figure 5).

Further, FIG. 2 is a diagram showing a control sequence in the first embodiment. In FIG. 2, each waveform shows a representative waveform assuming a case where the load imbalance is large. In addition, in FIG. 2, (a) is the speed of the car 30, (b) is the electric power of the motor 17, (c) is the detected charging current value of the storage battery 20, and (d) is the state of the main circuit contact 21 during a power outage ( on/off).

The elevator apparatus 100 includes each configuration shown in FIG. In the elevator system 100, when the commercial power supply 10 is cut off due to a power outage or the like, the elevator control panel 50 (elevator control device) detects the power outage and outputs a power outage operation signal 60. The power outage operation signal 60 closes the main circuit contact 21 during a power outage, and the storage battery 20 and the motor main circuit are connected. As a result, when the motor 17 requires power (power running mode), power is supplied to the motor 17 through the following route: storage battery 20 → power outage main circuit contact 21 → storage battery discharge diode 12 → inverter 16 → motor 17. . Note that the unidirectional circuit that supplies power running energy from the storage battery 20 to the motor 17 is also referred to as a first circuit.

Also, when the motor 17 operates as a generator due to braking and generates regenerative energy (regeneration mode), the motor 17 → inverter 16 → storage battery charging diode 22 → storage battery charging current sensor 23 (charging current measuring means) → power outage Power is recovered through the main circuit contact 21 → storage battery 20. Note that the unidirectional circuit that recovers regenerative energy generated from the motor 17 to the storage battery 20 is also referred to as a second circuit.

By making the current paths different between the power running mode and the regeneration mode as described above, a path through which only the regenerative current flows can be obtained, making the storage battery charging current sensor 23 less susceptible to switching noise, etc. - Power running mode determination (S14 in Figure 2) can be performed with high accuracy.

After a power outage is detected, the elevator control panel 50 compares the loads of the car 30 and the counterweight 31, and if the car 30 is heavier, it moves downwards, and if the counterweight 31 is heavier, it moves upwards, indicating the power outage operation direction. It is determined and the suspension control is started (S11). Up to this point, the control method is the same as that of the conventional technology. The following is the control method of this embodiment.

The power outage speed command generation unit 51 (speed command generation means) outputs a power outage operation speed command value 63 so as to accelerate to the lower limit speed setting value 62 stored in the lower limit speed storage unit 52 in advance. The elevator control panel 50 starts operation (S12), compares the power failure operation speed command value 63 and the speed feedback signal 70, and instructs the elevator to operate at the lower limit speed setting value 62 in the power failure operation direction determined as above. (S13). The lower limit speed setting value 62 is, for example, a relatively low speed.

At this time, if the storage battery charging current detection value 61 obtained from the storage battery charging current sensor 23 is not zero, it can be determined that charging current is flowing into the storage battery 20, so the power outage speed command generation unit 51 determines that the mode is regeneration mode. (S14). Note that the case where the storage battery charging current detection value 61 is zero will be described later in the fourth embodiment.

If it is determined that the mode is the regeneration mode, the power outage speed command generation unit 51 gradually increases the power outage operation speed command value 63 again, and gradually re-accelerates the car 30 (S15). The power outage speed command generation unit 51 constantly monitors the value of the storage battery charging current detection value 61 during re-acceleration, and when this value reaches the maximum peak, that is, the storage battery charging current detection value 61 increases as the acceleration progresses. When the regenerative power starts to decrease (S16), this point is regarded as the maximum regenerative power point, re-acceleration is finished, and the speed is maintained (S17).

After the start of deceleration (S18), the elevator operates as usual according to the deceleration pattern during power outage operation generated by the elevator control panel 50, and after landing on the floor, the power outage operation ends (S19).

As described above, according to the control method in the first embodiment, the regenerative energy generated during power outage operation can be extracted to the maximum extent, and the regenerative energy (symbol E in FIG. 2(b)) can be recovered to the storage battery 20. This can be used effectively to improve backup time during power outages. Additionally, it is possible to reduce the possibility of passengers being trapped between floors or intermediate floors due to the storage battery running out of capacity mid-way.

In addition, as the above control increases the operating speed during a power outage, the rescue time can be shortened compared to the conventional method, although it depends on the magnitude of the load difference (load imbalance) between the car 30 and the counterweight 31. realizable.

(Second embodiment)
Next, a second embodiment will be described. Compared to the first embodiment, the second embodiment relates to a protection control method when an upper limit speed is set in advance to prevent the risk of overspeeding.

FIG. 3 is a diagram showing a system configuration in the second embodiment (power outage operation to prevent overspeeding). FIG. 4 is a diagram showing a control sequence in the second embodiment. In FIG. 4, each waveform shows a representative waveform assuming a case where the load imbalance is large.

Since the basic system configuration and control method are the same as those in the first embodiment, the following description will focus on the differences from the first embodiment. In FIG. 3, an upper limit speed storage section 53 is added to FIG.

During the power outage operation, when the power outage speed command generation unit 51 determines that the mode is the regeneration mode, the power outage speed command value 63 is gradually increased again, and the car 30 is gradually accelerated again (S15). The process up to this point is the same as the first embodiment.

In the first embodiment, re-acceleration is then continued until the storage battery charging current detection value 61 reaches its maximum peak. However, if the speed at which the maximum regenerative power can be obtained is considerably high, There is a risk of exceeding the limit.

In order to avoid this, in the second embodiment, when the speed reaches the upper limit speed setting value 64 stored in advance in the upper limit speed storage section 53, re-acceleration is finished and the current speed is maintained thereafter. (S20). The upper limit speed setting value 64 is, for example, the highest speed within a range that allows safe operation even during a power outage.

After deceleration (S18), as in the first embodiment, the elevator operates according to the deceleration pattern during power outage operation generated by the elevator control panel 50, and after landing on the floor, the power outage operation ends (S19).

In this way, according to the second embodiment, although the vehicle operates at a speed lower than the original speed at the maximum regenerative power point, overspeeding can be avoided and power outage operation can be continued safely. In addition, as in the first embodiment, the regenerated energy (symbol E in FIG. 4(b)) generated during power outage operation can be effectively used by collecting it in the storage battery 20, which can be expected to improve backup time during power outage. .

(Third embodiment)
Next, a third embodiment will be described. Compared to the first embodiment, the third embodiment relates to a protection control method when a charging upper limit current value is set in advance in order to prevent the charging current to the storage battery 20 from becoming excessive.

FIG. 5 is a diagram showing a system configuration in the third embodiment (power failure operation to prevent charging overcurrent of storage battery). FIG. 6 is a diagram showing a control sequence in the third embodiment. In FIG. 6, each waveform shows a representative waveform assuming a case where the load imbalance is large. In FIG. 6, (e) shows the state (on/off, switching) of the storage battery charging converter 24, and (f) shows the state (on/off, switching) of the regenerative resistor switching element 15.

Since the basic system configuration and control method are the same as those in the first embodiment, the following description will focus on the differences from the first embodiment. In FIG. 5, an upper limit speed storage section 53, a charging current comparison section 54, a charging upper limit current storage section 55, a storage battery charging converter operation section 56, and a storage battery charging converter 24 are added to FIG.

During the power outage operation, when the power outage speed command generation unit 51 determines that the mode is the regeneration mode, the power outage speed command value 63 is gradually increased again, and the car 30 is gradually accelerated again (S15). The process up to this point is the same as the first embodiment.

In the first embodiment, after this, re-acceleration is continued until the storage battery charging current detection value 61 reaches the maximum peak, but there is a risk that the charging current of the storage battery 20 becomes excessive during re-acceleration.

In the third embodiment, in order to avoid this, the charging current comparison unit 54 compares the charging upper limit current setting value 65 stored in advance in the charging upper limit current storage unit 55 and the magnitude of the storage battery charging current detection value 61. Then, the charging current to the storage battery 20 is controlled based on the result. The charging upper limit current setting value 65 is, for example, the recommended charging current of the applied storage battery 20, or the maximum current value within a range where the storage battery 20 does not experience charging overcurrent.

If the charging upper limit current setting value 65 > the storage battery charging current detection value 61, the charging current has not reached the upper limit, so the charging current comparison unit 54 continuously outputs the on-level comparison output signal 66 to the storage battery charging converter operation unit. Output for 56.

When charging upper limit current setting value 65≦storage battery charging current detection value 61, the charging current has reached the upper limit, so the charging current comparator 54 performs intermittent (PWM) operation to maintain the current of charging upper limit current setting value 65. A comparison output signal 66 is outputted to the storage battery charging converter operating section 56 to perform feedback control of the charging current.

The storage battery charging converter operation unit 56 is an AND circuit, and when the power outage operation signal 60 and the comparison output signal 66 are both on level, it outputs the storage battery charging converter gate signal 67, and the switching element in the storage battery charging converter 24 is output. is turned on (Fig. 6(e)). The storage battery charging converter 24 is composed of a switching element and a smoothing circuit. Further, when the storage battery charging current detection value 61 reaches the charging upper limit current setting value 65, re-acceleration is terminated, and the current speed is maintained thereafter (S30).

If the regenerative power generated by the motor 17 increases further during operation in this state, the storage battery 20, which has already reached the charging upper limit current, cannot absorb the regenerative energy, so the main circuit DC section voltage increases and overvoltage occurs. There is a possibility that

To avoid this, as with the conventional method, when the DC section voltage detection value 72 exceeds a predetermined value, the elevator control panel 50 turns on the regenerative resistor switching element 15 by outputting the regenerative resistor switching element gate signal 73. (FIG. 6(f)), the regenerative energy is thermally consumed by the regenerative resistor 14, and the rise in the main circuit DC section voltage is suppressed.

After deceleration (S18), as in the first embodiment, the elevator operates according to the deceleration pattern during power outage operation generated by the elevator control panel 50, and after landing on the floor, the power outage operation ends (S19).

As described above, according to the third embodiment, the recovery of regenerative energy by charging the storage battery 20 (the symbol E2 in FIG. 6(b)) and the heat consumption of the regenerative energy by the regenerative resistor (the symbol E2 in FIG. 6(b)) E1), there is some loss of regenerated energy, but overvoltage in the main circuit DC section is avoided and power outage operation can be continued safely. Furthermore, similarly to the first embodiment, the regenerated energy generated during power outage operation can be effectively used by collecting it in the storage battery 20, and it is expected that the backup time during power outage will be improved.

Note that this embodiment can also be combined with the second embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described. Compared to the first embodiment, the fourth embodiment relates to a control method when the power running mode is determined.

FIG. 7 is a diagram showing a control sequence in the fourth embodiment (power outage operation). In FIG. 7, each waveform shows a representative waveform assuming a case where the load imbalance is small.

Since the basic system configuration and control method are the same as those in the first embodiment, the following description will focus on the differences from the first embodiment.

After the elevator starts operating (S12), it operates at the lower limit speed setting value 62 (S13). At this time, if the storage battery charging current detection value 61 obtained from the storage battery charging current sensor 23 is zero, no charging current is flowing into the storage battery 20, and the power outage speed command generation unit 51 determines that it is the power running mode (S14 ).

When it is determined that the vehicle is in the power running mode, re-acceleration as in the first embodiment is not performed, and the power outage speed command generation unit 51 maintains the lower limit speed as it is (S40).

After deceleration (S18), the elevator operates as usual according to the deceleration pattern during power outage operation generated by the elevator control panel 50, and after landing on the floor, the power outage operation ends (S19).

In this manner, according to the fourth embodiment, it is possible to operate at the minimum necessary speed and continue power outage operation without using unnecessary storage battery power in the power running mode.

Note that this embodiment can also be combined with the second embodiment or the third embodiment.

Further, the program executed in the elevator apparatus 100 of this embodiment is a file in an installable format or an executable format, such as a CD (Compact Disc)-ROM (Read Only Memory), a flexible disk (FD), or a CD-R. (Recordable), DVD (Digital Versatile Disk), or other computer-readable recording media. Further, the program may be provided or distributed via a network such as the Internet.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

For example, in the third embodiment, various controls were performed based on the magnitude of the charging current to the storage battery 20, but in addition to the magnitude of the charging current to the storage battery 20, for example, the SOC ( The magnitude of the state of charge may be used for various controls. Specifically, for example, when the SOC of the storage battery 20 is somewhat close to full charge (for example, 90% of full charge), the storage battery charging converter 24 is turned off and the storage battery 20 is no longer charged. You can do it like this.

Further, in each of the above-described embodiments, operation control may be used in combination to prevent the car 30 from stopping at an intermediate floor as much as possible.

10... Commercial power supply, 11... Converter, 12... Storage battery discharge diode, 13... Smoothing capacitor, 14... Regenerative resistor, 15... Switching element for regenerative resistor, 16... Inverter, 17... Motor, 20... Storage battery, 21... During power outage Main circuit contact, 22... Storage battery charging diode, 23... Storage battery charging current sensor, 24... Storage battery charging converter, 30... Car, 50... Elevator control panel, 51... Speed command generation unit during power outage, 52... Lower limit speed memory Section, 53... Upper limit speed storage section, 54... Charging current comparison section, 55... Charging upper limit current storage section, 56... Storage battery charging converter operation section, 100... Elevator device

Claims (5)

A main circuit configuration that can supply power to the motor from a storage battery connected to the DC section of the elevator main circuit when commercial power is cut off due to a power outage, a regenerative resistance circuit that consumes regenerative energy generated by the motor, and a main circuit configuration that can supply power to the motor from a storage battery connected to the DC section of the elevator main circuit, a regenerative resistor circuit that consumes regenerative energy generated by the motor, and a an elevator control device that compares the loads of a car and a counterweight, and determines a direction of operation in a downward direction if the car is heavier, and an upward direction if the counterweight is heavier, and performs a power outage operation; In an elevator system equipped with
a unidirectional first circuit that supplies power running energy from the storage battery to the motor during power outage;
a unidirectional second circuit that recovers regenerative energy generated from the motor to the storage battery;
After the start of power outage operation, the car is accelerated to a preset lower limit speed, and when a charging current of the storage battery is detected while operating at the lower limit speed, the regeneration mode is determined, and when the regeneration mode is determined, the Speed command generation means for re-accelerating from the lower limit speed, determining that the regenerative power is at the maximum point when the charging current of the storage battery reaches the maximum peak, terminating the re-acceleration, and maintaining the current operating speed. elevator equipment. 2. The speed command generating means, during re-acceleration of the car, terminates the re-acceleration when the driving speed reaches a preset upper limit speed, and maintains the driving speed at the upper limit speed. Elevator equipment described in. a storage battery charging converter arranged in the second circuit and capable of adjusting the magnitude of charging current to the storage battery;
During re-acceleration of the car, when the charging current of the storage battery reaches a preset upper limit current value, the storage battery charging converter is controlled to adjust the charging current so as to maintain it at the upper limit current value. a converter operating means for
The speed command generation means terminates the re-acceleration of the car at the time when the charging current of the storage battery reaches a preset upper limit current value during the re-acceleration of the car, and determines the operating speed at that time. maintain,
The elevator device according to claim 1, wherein the elevator control device causes regenerative energy that cannot be recovered by the storage battery to be thermally consumed by a regenerative resistor. The speed command generating means accelerates the car to a preset lower limit speed after the start of the power outage operation, and determines that the car is in the power running mode when no charging current of the storage battery is detected while the car is operating at the lower limit speed. 2. The elevator system according to claim 1, wherein when determining that the elevator car is in the power running mode, the operating speed is maintained at the lower limit speed without reaccelerating the car. A main circuit configuration that can supply power to the motor from a storage battery connected to the DC section of the elevator main circuit when commercial power is cut off due to a power outage, a regenerative resistance circuit that consumes regenerative energy generated by the motor, and a main circuit configuration that can supply power to the motor from a storage battery connected to the DC section of the elevator main circuit, a regenerative resistor circuit that consumes regenerative energy generated by the motor, and a An elevator control device that compares the loads of a car and a counterweight, and determines an operating direction downward if the car is heavier and upwards if the counterweight is heavier, and performs a power outage operation; a unidirectional first circuit that supplies power running energy from the storage battery to the motor during operation; a unidirectional second circuit that recovers regenerative energy generated from the motor to the storage battery; An elevator control method in an elevator apparatus, comprising: a charging current measuring means arranged in a circuit for measuring a charging current of the storage battery; and a speed command generating means, the method comprising:
When the speed command generating means accelerates the car to a preset lower limit speed after the start of power outage operation, and detects the charging current of the storage battery while operating at the lower limit speed, it determines that the car is in regeneration mode, and starts regeneration. mode, the speed is re-accelerated from the lower limit speed, and when the charging current of the storage battery reaches its maximum peak, it is regarded as the maximum regenerative power point, the re-acceleration is ended, and the current operating speed is maintained. An elevator control method including a command generation step.

Images