JP7417072B2 - Supply and demand control system - Google Patents

Description

The present invention relates to a supply and demand control system.

In recent years, instead of electric power companies adjusting the amount of electricity supplied according to the amount of electricity consumed by consumers, as shown in Patent Document 1, the amount of electricity consumed (demanded) by consumers is adjusted to the amount of electricity supplied by the electric power company. A mechanism for adjusting supply and demand (demand and supply adjustment) is being established.

On the other hand, as shown in Patent Document 2, the applicant has proposed a circuit breaker that cuts off the power supply from the power system to the load, and a circuit breaker that is connected to the load side of the circuit breaker and converts the energy of the energy storage unit into AC power. We are proceeding with the development of a power supply system that is equipped with a power converter and performs voltage compensation operation to compensate for voltage abnormalities in the power system and peak cut operation to suppress the power consumption of consumer equipment in the power system.

Japanese Patent Application Publication No. 4-117144 Patent No. 6338131

The inventor of the present invention conceived that if the above-mentioned power supply system receives a demand response (DR) command and performs a peak cut operation, it can be used as a supply and demand adjustment power source from the power grid side.

However, when the above-mentioned power supply system is used for supply and demand adjustment such as DR support, the adjustment capacity depends on the load capacity that is peak-cut by the power supply system, so it is difficult to respond flexibly to supply and demand adjustment commands.

The present invention has been made to solve the above problems, and provides a plurality of power supplies that perform voltage compensation operation to compensate for voltage abnormalities in the power grid and peak cut operation to suppress the power consumption of consumer equipment for the power grid. The main objective is to use the system to easily respond to demands for adjusting supply and demand in the power system.

That is, the supply and demand control system according to the present invention includes a plurality of voltage compensation operations for compensating for voltage abnormalities in the power system for the load of customer equipment, and peak cut operations for suppressing the power consumption of the customer equipment for the power system. a power supply system, and a supply and demand adjustment controller that controls the plurality of power supply systems based on a supply and demand adjustment request of the power system, the supply and demand adjustment controller making a supply and demand adjustment request that acquires a supply and demand adjustment request of the power system. an acquisition unit; a combination determining unit that determines a combination of the power supply systems to perform a peak cut operation among the plurality of power supply systems based on the supply and demand adjustment amount of the supply and demand adjustment request; and the power supply to perform the peak cut operation. The present invention is characterized by comprising a peak cut command output section that outputs a peak cut command to the system.

According to the present invention, the supply and demand of the power system can be adjusted by using a plurality of power supply systems that perform a voltage compensation operation that compensates for voltage abnormalities in the power system and a peak cut operation that suppresses the power consumption of consumer equipment for the power system. Able to respond to adjustment requests. Here, the combination of power systems to perform peak cut operation among multiple power supply systems is determined based on the amount of demand and supply adjustment in the demand and supply adjustment request, so the optimal power supply system is selected for the amount of demand and supply adjustment in the demand and supply adjustment request. It can be handled by combination.

As a specific embodiment for adjusting supply and demand using a plurality of power supply systems, the supply and demand adjustment controller includes a power flow value acquisition unit that acquires power flow values supplied to the plurality of power supply systems; and an operation information acquisition unit that acquires operation information of the power supply system, and the combination determination unit is configured to determine the supply and demand adjustment amount, the power flow value acquired by the power flow value acquisition unit, and the operation information acquired by the operation information acquisition unit. It is desirable to use this information to determine the combination of power supply systems that will perform the peak cut operation.

The supply and demand adjustment controller further includes a load classification information storage section that stores load classification information in which loads subject to peak cut operations are classified by capacity, and the combination determination section uses the load classification information to It is desirable to determine the combination of power systems that will perform the cutting operation.
It is conceivable to classify the loads to be subjected to the peak cut operation by capacity so that the capacity ratio thereof is, for example, 1:2:4:...: ^2N . There are 15 combinations of load capacities of 1:2:4:8, and fine adjustments can be made to the supply and demand adjustment amount. Furthermore, the number of loads subject to peak cut operations (the number of consumers corresponding to supply and demand adjustment) can be reduced.

In order to accurately respond to the demand and supply adjustment request based on the current load state, the operation information acquisition unit acquires the load capacity of each of the plurality of power supply systems, and the combination determination unit It is desirable that a combination of power supply systems for performing a peak cut operation be determined using the load capacity acquired by the operation information acquisition section.

As a specific embodiment of determining a combination of power supply systems to perform a peak cut operation using the load capacity acquired by the operation information acquisition section, the supply and demand adjustment controller is configured to use the load capacity acquired by the operation information acquisition section. The system further includes a pattern generation unit that generates a combination pattern of power supply systems for realizing each demand and supply adjustment amount by combining load capacities, and the combination determination unit causes a peak cut operation to be performed using the load combination pattern. It is desirable to decide on a combination of power supply systems.

The operation information acquisition unit acquires the cumulative operation time of each of the plurality of power supply systems, and the combination determination unit performs a peak cut operation using the cumulative operation time acquired by the operation information acquisition unit. It is desirable to determine the combination of power supply systems to be used.
For example, by outputting the peak cut command in the order of the power supply systems with the shortest cumulative operating time and outputting the stop command in the order of the power supply systems with the longest cumulative operating time, the operating rates of the respective power supply systems can be equalized. As a result, maintenance can be performed all at once without variation, and maintenance and maintainability can be improved.

A specific configuration of a power supply system that realizes both a voltage compensation operation that compensates for voltage abnormalities and a peak cut operation that suppresses power consumption of consumer equipment is such that the power supply system supplies power from the power system to the load. It is desirable to have a power supply device having a power converter and an energy storage unit connected to a power line for the power supply, and a circuit breaker that is provided on the power line closer to the power system than the power supply device and opens and closes the power line.
With this configuration, when a peak cut command or a stop command is output due to a supply and demand adjustment request, the command can be satisfied simply by opening the circuit breaker, resulting in excellent responsiveness.

In order to improve the stability of the voltage compensation operation or the peak cut operation, it is desirable that the power supply system includes a generator that is connected to the power line separately from the power supply section.

According to the present invention configured in this way, the power system is controlled by using a plurality of power supply systems that perform a voltage compensation operation that compensates for voltage abnormalities in the power system and a peak cut operation that suppresses the power consumption of consumer equipment for the power system. This makes it easier to respond to demand and supply adjustment requests.

1 is a schematic diagram showing the configuration of a supply and demand control system according to an embodiment of the present invention. It is a figure showing normal operation of the power supply system of the same embodiment. FIG. 2 is a functional block diagram of a supply and demand adjustment controller. It is a flowchart which shows the operation of the supply and demand controller of the same embodiment. FIG. 7 is a functional block diagram of a supply and demand adjustment controller according to a modified embodiment. It is a flow chart which shows operation of a demand and supply controller of a modification embodiment.

An embodiment of the supply and demand control system according to the present invention will be described below with reference to the drawings.

<1. Supply and demand control system>
As shown in FIG. 1, the supply and demand control system 100 of the present embodiment performs a voltage compensation operation that compensates for voltage abnormalities in the power system PS with respect to the load L of the customer equipment, and suppresses power consumption of the customer equipment with respect to the power system PS. The power supply system 10 includes a plurality of power supply systems 10 that perform peak cut operations, and a supply and demand adjustment controller 20 that controls the plurality of power supply systems 10 based on demand and supply adjustment requests of the power system PS. In addition, although the case below is assumed where the plurality of power supply systems 10 are located within the same consumer, the case where the plurality of power supply systems 10 are located within mutually different consumers may be used.

<2. Power system 10>
The power supply system 10 is provided between the power system PS and the load L and is of a constant commercial power supply type. This power supply system 10 supplies power from the power system PS to a load L when the power system PS is normal, cuts off power supply from the power system PS to the load L when a voltage abnormality occurs due to a short-circuit accident in the power system PS, etc. 12 and a generator 13 to supply power to the load L.

Specifically, the power supply system 10 includes a circuit breaker 11 that cuts off power supply from the power system PS to the load L, a power supply device 12 connected to the load L side from the circuit breaker 11, and a power supply device 12 connected to the load L side from the circuit breaker 11. For example, an emergency generator 13 is connected to the generator.

The circuit breaker 11 is provided on a power line PL for feeding power from the power system PS to the load L. This circuit breaker 11 can be a changeover switch capable of high-speed switching, such as a semiconductor switch or a hybrid switch that combines a semiconductor switch and a mechanical switch. For example, when a semiconductor switch is used, the cutoff time can be reduced to 2 msec or less, and the cutoff can be made regardless of the zero point. Furthermore, when a hybrid switch is used, the cut-off time can be reduced to 2 msec or less, and not only can the cut-off be performed regardless of the zero point, but also the current loss can be reduced to zero. Note that this circuit breaker 2 is controlled to open and close by a control device (not shown).

The power supply device 12 is a distributed power supply and includes an energy storage section 12a and a power converter 12b. The energy storage unit 12a is an energy storage device such as a storage battery such as a secondary battery, a flywheel, a fuel cell, an electric double layer capacitor, a pumped storage power generation type, a compressed air storage type, or a superconducting power storage type. be. The energy in the energy storage device is converted into AC power by the power converter 12b, and the AC power is supplied to the load L. Note that the power converter 12b is configured using a semiconductor switching element, and is controlled by a control device (not shown).

The basic operation of the power supply system 10 will be described below with reference to FIG. 2.

(1) Normal time Power is supplied to the load L from the power system PS. The generator 13 is stopped, the energy storage section 12a of the power supply device 12 is charged from the power system PS, and when it is fully charged, the power converter 12b is stopped.

(2) During instantaneous power outages, power outages, and peak load cuts (see Figure 2)
The circuit breaker 11 is opened, the power supply device 12 is operated independently, and the power supply to the load L is switched from the power system PS to the power supply device 12. Thereafter, the generator 13 is started and power supply to the load L is switched from the power supply device 12 to the generator 13. At the end of power restoration or peak cut, the power supply to the load L is switched from the generator 13 to the power supply device 12. Thereafter, the circuit breaker 11 is turned on to switch the power supply to the load L from the power supply device 12 to the power system PS.

<3. Supply and demand adjustment controller 20>
The supply and demand adjustment controller 20 outputs a peak cut command to satisfy supply and demand adjustment requests using the plurality of power supply systems 10. Specifically, the supply and demand adjustment controller 20 is a computer having a CPU, an internal memory, an input/output interface, an AD converter, and communication equipment.

As shown in FIG. 3, the supply and demand adjustment controller 20 has a supply and demand adjustment request acquisition unit 20a, a power flow value acquisition unit, and a supply and demand adjustment request acquisition unit 20a, as shown in FIG. 20b, a driving information acquisition section 20c, a load classification information storage section 20d, a combination determination section 20e, a peak cut command output section 20f, etc. Each part will be explained below.

The supply and demand adjustment request acquisition unit 20a acquires a supply and demand adjustment request for the power system PS from an electric power company. Here, the demand-supply adjustment request is Demand Response (DR), which means that when market prices soar or system reliability declines, the consumer side responds to the setting of electricity rates or the payment of incentives. The idea is to change power consumption patterns to reduce the use of

The power flow value acquisition unit 20b acquires power flow values supplied to the plurality of power supply systems 10, and acquires power flow values (active power, reactive power, etc.) on the line (power receiving point) from the power system PS to consumer equipment. get. Note that the power flow value is measured by a meter not shown.

The operation information acquisition unit 20c acquires operation information of the plurality of power supply systems 10. Specifically, the operation information acquisition unit 20c acquires the power consumption of the load L, the load capacity, the operation state of the load L, the cumulative operating time of the power supply device 12 and the generator 13, and the like. These operating information are measured by each power supply system 10 and transmitted from the control device of the power supply system 10.

The load classification information storage section 20d stores load classification information in which the loads L to be subjected to the peak cut operation are classified by capacity. For example, the load classification information storage unit 20d stores information that classifies the load L to be subjected to the peak cut operation by capacity so that the capacity ratio thereof is, for example, 1:2:4:...: ^2N . is stored. These classification information may be set in advance by the operator, or may be automatically set by the supply and demand adjustment controller 20 based on the load capacity obtained by the operation information acquisition section 20c. Note that the number of loads classified into each ratio may be one or multiple.

The combination determination unit 20e determines a combination of power supply systems 10 to perform peak cut operations among the plurality of power supply systems 10 based on the supply and demand adjustment amount of the supply and demand adjustment request. Specifically, the combination determination unit 20e determines the combination of power supply systems 10 that perform peak cut operations using the supply and demand adjustment amount, the power flow value acquired by the power flow value acquisition unit, and the operation information acquired by the operation information acquisition unit 20c. Determine.

The peak cut command output unit 20f outputs a peak cut command to the power supply system 10 to perform the peak cut operation determined by the combination determination unit 20e.

Next, the operation of the supply and demand adjustment controller 20 and the supply and demand adjustment procedure will be described with reference to FIG. 3.

The supply and demand adjustment controller 20 uses the power flow value acquisition unit 20b and the operation information acquisition unit 20c to constantly or continuously monitor the power flow value, the power consumption of each of the loads L (1 to N), and the operating status of the power supply system 10 (1 to N). It is acquired periodically (step Sa1). Further, the supply and demand adjustment controller 20 stores load classification information classified by capacity in the load classification information storage section 20d (step Sa2).

Next, when the supply and demand adjustment controller 20 acquires a supply and demand adjustment request for the power system PS from the electric power company (step Sa3), the supply and demand adjustment controller 20 receives a supply and demand adjustment value from the electric power company (step Sa4). Based on this supply and demand adjustment value, the combination determination unit 20e of the supply and demand adjustment controller 20 selects the combination of power supply systems 10 that is closest to the supply and demand adjustment value (step Sa5). Then, the peak cut command output unit 20f of the supply and demand adjustment controller 20 outputs a peak cut command to the power supply system 10 to be combined to perform the peak cut operation.

In the plurality of power supply systems 10, the following control is performed so that the selected combination of power supply systems 10 is achieved (step Sa6). For example, when the power supply system 10 to be combined is stopped, the power supply system 10 is operated. Further, among the power supply systems 10 that are not subject to combination, the power supply systems 10 that are in operation are stopped or the circuit breakers 11 are opened.

<4. Effects of this embodiment>
According to the supply and demand control system 100 of the present embodiment configured in this way, a plurality of voltage compensation operations that compensate for voltage abnormalities in the power system PS and peak cut operations that suppress the power consumption of consumer equipment for the power system PS are performed. The power supply system 10 can be used to respond to demand and supply adjustment requests of the power system PS. Here, since the combination of the power supply systems 10 to perform the peak cut operation among the plurality of power supply systems 10 is determined based on the supply and demand adjustment amount of the demand and supply adjustment request, the power supply systems 10 This can be achieved by optimally combining the following.

<5. Modified embodiment>
Note that the present invention is not limited to the above embodiments.

For example, the combination determination unit 20e may determine a combination of power supply systems 10 to perform a peak cut operation using the load capacity acquired by the operation information acquisition unit 20c. Specifically, as shown in FIG. 4, the supply and demand adjustment controller 20 generates a pattern that generates a combination pattern of the power supply systems 10 for realizing each supply and demand adjustment amount by combining the load capacities acquired by the operation information acquisition unit 20c. It further includes a portion 20g. Then, the combination determination unit 20e uses the combination pattern of the power supply systems 10 to determine a combination of the power supply systems 10 to perform the peak cut operation.

In this case, the operation of the supply and demand adjustment controller 20 and the supply and demand adjustment procedure are as shown in FIG.
The supply and demand adjustment controller 20 uses the power flow value acquisition unit 20b and the operation information acquisition unit 20c to constantly or continuously monitor the power flow value, the power consumption of each of the loads L (1 to N), and the operating status of the power supply system 10 (1 to N). It is acquired periodically (step Sb1). Furthermore, the pattern generation unit 20g of the supply and demand adjustment controller 20 generates a combination pattern of the power supply system 10 for realizing each supply and demand adjustment amount by combining the load capacities acquired by the operation information acquisition unit 20c (step Sb2).

Next, when the supply and demand adjustment controller 20 acquires a demand and supply adjustment request for the power system PS from the electric power company (step Sb3), the supply and demand adjustment controller 20 receives a supply and demand adjustment value from the electric power company (step Sb4). Based on this supply and demand adjustment value, the combination determination unit 20e of the supply and demand adjustment controller 20 selects the combination of power supply systems 10 closest to the supply and demand adjustment value from among the combination patterns (step Sb5). Then, the peak cut command output unit 20f of the supply and demand adjustment controller 20 outputs a peak cut command to the power supply system 10 to be combined to perform the peak cut operation.

In the plurality of power supply systems 10, the following control is performed so that the selected combination of power supply systems 10 is achieved (step Sb6). For example, when the power supply system 10 to be combined is stopped, the power supply system 10 is operated. Further, among the power supply systems 10 that are not subject to combination, the power supply systems 10 that are in operation are stopped or the circuit breakers 11 are opened.

In this way, the load capacities acquired by the operation information acquisition unit 20c are combined to generate a combination pattern of the power supply systems 10, and the combination pattern is used to select the power supply system 10 to perform the peak cut operation. , it is possible to accurately respond to demand and supply adjustment requests based on the current load state.

In addition to the embodiments described above, the combination determination unit 20e may be configured to use the cumulative operating time acquired by the operation information acquisition unit 20c to determine a combination of power supply systems 10 to perform peak cut operations. . For example, peak cut commands are output in the order of power supply systems with shorter cumulative operating times, and stop commands are output in the order of power supply systems with longer cumulative operating times. Specifically, in step Sa5 mentioned above, the combination of power supply systems 10 closest to the supply and demand adjustment value is selected while considering the cumulative operating time of each power supply system 10. Furthermore, in step Sb5 described above, the combination of power supply systems 10 closest to the supply and demand adjustment value is selected from among the combination patterns, taking into account the cumulative operating time of each power supply system 10. In this way, by considering the cumulative operating time of each power supply system 10, the operating rates of each power supply system 10 can be equalized. As a result, maintenance can be performed all at once without variation, and maintenance and maintainability can be improved.

In addition, it goes without saying that the present invention is not limited to the embodiments described above, and that various modifications can be made without departing from the spirit thereof.

100...Uninterruptible power supply system L...Load PS...Power system 10...Power supply system 20...Demand and supply adjustment controller 20a...Demand and supply adjustment request acquisition section 20e...Combination determination section 20f. ... Peak cut command output section 20b ... Power flow value acquisition section 20c ... Operation information acquisition section 20d ... Load classification information storage section 20g ... Pattern generation section 11 ... Circuit breaker 12 ... Power supply Device 12b... Power converter 12a... Energy storage unit 13... Generator

Claims (7)

a plurality of power supply systems that perform a voltage compensation operation that compensates for voltage abnormalities in a power system with respect to a load of customer equipment, and a peak cut operation that suppresses power consumption of the customer equipment with respect to the power system;
a supply and demand adjustment controller that controls the plurality of power supply systems based on a demand and supply adjustment request of the power system,
The supply and demand adjustment controller is
a supply and demand adjustment request acquisition unit that acquires a supply and demand adjustment request for the power system;
a power flow value acquisition unit that acquires power flow values supplied to the plurality of power supply systems;
an operation information acquisition unit that acquires operation information of the plurality of power supply systems;
the supply and demand adjustment amount of the demand and supply adjustment request, the power flow value acquired by the power flow value acquisition unit, and the operation information acquired by the operation information acquisition unit , to perform a peak cut operation among the plurality of power supply systems; a combination determination unit that determines a combination of power supply systems;
A supply and demand control system comprising: a peak cut command output unit that outputs a peak cut command to the power supply system that causes the power supply system to perform a peak cut operation. The supply and demand adjustment controller further includes a load classification information storage unit that stores load classification information in which loads to be subjected to peak cut operations are classified by capacity,
The supply and demand control system according to claim 1 , wherein the combination determining unit uses the load classification information to determine a combination of power supply systems to perform a peak cut operation. The operation information acquisition unit acquires the load capacity of each of the plurality of power supply systems,
The supply and demand control system according to claim 1 , wherein the combination determination unit determines a combination of power supply systems to perform peak cut operation using the load capacity acquired by the operation information acquisition unit. The supply and demand adjustment controller further includes a pattern generation unit that generates a combination pattern of power supply systems for realizing each supply and demand adjustment amount by combining the load capacities acquired by the operation information acquisition unit,
The supply and demand control system according to claim 3 , wherein the combination determining unit determines a combination of power supply systems to perform peak cut operation using the load combination pattern. The operation information acquisition unit acquires cumulative operation time of each of the plurality of power supply systems,
The supply and demand according to any one of claims 1 to 4 , wherein the combination determination unit determines a combination of power supply systems to perform a peak cut operation using the cumulative operating time acquired by the operation information acquisition unit. control system. The power supply system includes:
a power supply device having an energy storage unit and a power converter connected to a power line for supplying power from the power system to the load;
The supply and demand control system according to any one of claims 1 to 5 , further comprising a circuit breaker that is provided on the power line closer to the power system than the power supply device and opens and closes the power line. The supply and demand control system according to claim 6 , wherein the power supply system includes a generator connected to the power line separately from the power supply device .