JP6746935B2 - Charge/discharge control system, charge/discharge control method and program - Google Patents

Description

The present invention relates to a charging/discharging control system, a charging/discharging control method and a program, and more particularly to a charging/discharging control system, a charging/discharging control method and a program for controlling charging/discharging of a storage battery that stores surplus power of a generator.

Patent Document 1 discloses an independent power supply system that can reduce installation costs. Specifically, the independent power supply system of the same document calculates the demand forecast data of the load device and the power generation output forecast data of the natural energy power generator by using the weather forecast data, and calculates the demand forecast data and the power generation. The output prediction data suppresses the power generation output from the natural energy power generation device when it is predicted that the storage battery will be charged by exceeding the maximum charging power of the storage battery, and the demand prediction data and the power generation output data As a result, when it is predicted that the storage battery will be discharged in excess of the maximum discharge power of the storage battery, the power consumption of the adjustment load is suppressed. According to Patent Document 1, by adopting the above configuration, installation cost is reduced by eliminating the need to separately provide a power source for adjustment such as a diesel engine and the need to increase the capacity of the power storage device.

Patent Document 2 discloses a solar power generation system in which system collapse in an electric power system is suppressed and the generated power can be effectively utilized. According to the document, the solar power generation system includes a solar cell module 1 that performs solar power generation and a measurement unit 5 that measures the generated power, and further, as an electric device that can consume the generated power, An electric water heater 4 for boiling hot water in response to power supply is included. Then, when this solar power generation system acquires the output suppression information instructing the output suppression and determines that the electric water heater 4 can perform the boiling operation, the measurement unit 5 releases the output suppression of the generated power and , The electric power used by the electric water heater 4 is calculated.

As described in Non-Patent Documents 1 and 2, in recent years, a distributed power source using renewable energy represented by solar power generation (photovoltaics, solar photovoltaics; hereinafter, referred to as “PV”) and wind power ( Due to the rapid increase in the number of power generators, the surplus power that flows backward to the power system increases, causing a problem that the power system becomes unstable.

At present, as in Non-Patent Documents 1 and 2, free output control is performed for 30 days a year based on the output control on a daily basis, but in the future, output suppression control on an hourly basis will be examined. Has been done. However, in order to realize the output suppression control on an hourly basis, there is a problem that contact or calendar control in the evening of the previous day such as slide 10 page of Non-Patent Document 1 cannot be applied. Further, according to Non-Patent Document 1, small-scale solar power generation facilities for home use and the like are also planned to be subject to output control in the future.

JP, 2013-176234, A JP, 2005-106937, A

Kyushu Electric Power Co., Inc., February 2015 “Explanatory material regarding resumption of answers to connection applications for renewable energy power generation facilities in mainland Kyushu”, [online], [Search on December 10, 2015], Internet <URL: http://www.kyuden.co.jp/library/pdf/notice/q27hfv5k.pdf〉 Tohoku Electric Power Co., Inc., January 2015 “(Appendix 1) Concept of applying new output control rules for renewable energy power generation facilities based on the revised Ministerial Ordinance”, [online], [December 10, 2015 search], Internet <URL: http://www.tohoku-epco.co.jp/news/normal/__icsFiles/afieldfile/2015/01/23/1188918b1.pdf>

The following analysis is given by the present invention. Even if the above PV output suppression instruction is received, if the power consumption on the PV installation facility side exceeds the PV output value, it is not necessary to suppress the PV output. However, in a PV installation facility that cannot perform power generation control linked to load consumption, there is a problem that power must be purchased from the grid side when the power consumption in the load exceeds the power generation after applying the suppression instruction.

It is an object of the present invention to provide a charge/discharge control system, a charge/discharge control method, and a program that can contribute to improving the efficiency of operation of the charge/discharge control system in an environment in which the output of the generator is suppressed. And

According to the first aspect, a power generator that supplies power to the load facility or supplies surplus power to the grid side and the surplus power from the power generator can be stored, or the stored power can be supplied to the load facility. There is provided a charging/discharging control system including a storage battery, and a control unit that receives a power generation amount suppression instruction from an external device. More specifically, the control unit, in the period instructed by the power generation amount suppression instruction, when the free capacity of the storage battery is less than a predetermined value, performs the suppression control according to the suppression instruction, In the period of performing the suppression control according to the suppression instruction, if the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge to control to supply power to the load equipment from the storage battery. Take control.

According to the second aspect, in the period instructed by the power generation amount suppression instruction in the power generation device, the communication unit that receives the state of the storage battery, and the suppression instruction, the free capacity of the storage battery becomes less than a predetermined value. In the case where the power generation control unit that suppresses power generation according to the suppression instruction and the suppression control according to the suppression instruction are performed, the power supplied to the load facility exceeds the power suppressed by the suppression instruction. In this case, there is provided a control device including a discharge control unit that discharges the storage battery so as to supply power to the load facility.

According to the third aspect, a power generator that supplies power to the load facility or supplies surplus power to the grid side, and excess power from the power generator can be stored, or the stored power can be supplied to the load facility. In a charging/discharging control system that includes a storage battery and a control unit that receives an instruction to suppress the amount of power generation from an external device, in the period instructed by the instruction to suppress the amount of power generation, the free capacity of the storage battery becomes a predetermined value or more. In the case where the storage battery is in the state of performing the charging control for charging the storage battery with the surplus power of the power generated by the power generation device, and when the free capacity of the storage battery is less than a predetermined value, follow the suppression instruction. If the power supplied to the load equipment exceeds the power suppressed by the suppression instruction in the period in which the suppression control is performed according to the suppression instruction, the power is supplied from the storage battery to the load equipment. Provided is a charge/discharge control method for performing discharge control for controlling supply. The method is tied to a specific machine, which is a charge/discharge control system including the power generation device, the storage battery, and the control unit.

According to the fourth aspect, a power generator that supplies power to the load facility or supplies surplus power to the grid side, and excess power from the power generator can be stored, or the stored power can be supplied to the load facility. A storage battery, and a control unit that receives a power generation amount suppression instruction from an external device, to a computer that configures a charging/discharging control system, in a period instructed by the power generation amount suppression instruction, the free capacity of the storage battery is predetermined. If the value is equal to or more than the value, a process of performing charging control for charging the storage battery with surplus power of the power generated by the power generation device, and the free capacity of the storage battery is less than a predetermined value In the period of performing the suppression control according to the suppression instruction and the suppression control according to the suppression instruction, when the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, A program for executing a process of performing discharge control for controlling the power supply from a storage battery to the load facility is provided. Note that this program can be recorded in a computer-readable (non-transient) storage medium. That is, the present invention can be embodied as a computer program product.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to contribute to the improvement in the efficiency of the operation of a charge/discharge control system in the environment where the output of a generator is suppressed.

It is a figure which shows the structure of one Embodiment of this invention. It is a figure for demonstrating operation|movement of one Embodiment of this invention. FIG. 9 is another diagram for explaining the operation of the embodiment of the present invention. It is a figure which shows the structure of another embodiment of this invention. It is a figure which shows the structure of another embodiment of this invention. It is a figure which shows the structure of another embodiment of this invention. It is a figure which shows the structure of the charging/discharging control system of the 1st Embodiment of this invention. It is a functional block diagram which shows the structural example of HEMS of the charge/discharge control system of the 1st Embodiment of this invention. It is a flow chart showing operation of a charge-and-discharge control system of a 1st embodiment of the present invention. It is another flowchart showing operation|movement of the charge/discharge control system of the 1st Embodiment of this invention. It is a timing chart for demonstrating operation|movement of the charge/discharge control system of the 1st Embodiment of this invention. It is a figure for demonstrating the charge operation at the time of the completion|finish of suppression control of the charge/discharge control system of the 1st Embodiment of this invention. It is a flowchart showing operation|movement of the charge/discharge control system of the 2nd Embodiment of this invention. It is a timing chart for demonstrating operation|movement of the charging/discharging control system of the 2nd Embodiment of this invention. It is a flowchart showing operation|movement of the charging/discharging control system of the 3rd Embodiment of this invention. It is a timing chart for demonstrating operation|movement of the charging/discharging control system of the 3rd Embodiment of this invention. It is a flowchart showing operation|movement of the charging/discharging control system of the 4th Embodiment of this invention. It is a timing chart for demonstrating operation|movement of the charging/discharging control system of the 4th Embodiment of this invention. It is a functional block diagram which shows the structural example of HEMS of the charge/discharge control system of the 5th Embodiment of this invention. It is a figure for demonstrating operation|movement of the charging/discharging control system of the 5th Embodiment of this invention. It is a figure for demonstrating the reference example relevant to this invention. It is a figure for demonstrating the reference example relevant to this invention.

First, an outline of an embodiment of the present invention will be described with reference to the drawings. Note that the reference numerals in the drawings attached to this outline are added to the respective elements for convenience as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated modes.

Some PCSs (Power Conditioning Systems) connected to existing PVs cannot suppress the amount of power generation within a range in which a reverse power flow does not occur (on the contrary, an output adjustment function matching self-power consumption is Load tracking function"). In this type of photovoltaic power generation facility that does not have a load following function, when it receives an output suppression instruction, it may be able to cover its own consumption, but it may be necessary to purchase electricity. Hereinafter, a charge/discharge control system suitably applied to a configuration having such a PCS will be described.

In one embodiment thereof, the present invention can be realized by a charge/discharge control system including a power generation device 100, a storage battery 200, a control device 300, and a load facility 400, as shown in FIG. 1. More specifically, the power generation device 100 supplies power to the load facility 400 or supplies surplus power to the grid side. The storage battery 200 can store the surplus power from the power generation device 100 or can supply the stored power to the load equipment 400. The control device 300 monitors the state of charge (SOC; State Of Charge) of the storage battery 200, and receives a power generation amount suppression instruction from an external device such as a higher-level device on the system side.

Then, as shown in FIG. 2, when the free capacity of the storage battery 200 is equal to or larger than a predetermined value during the period instructed by the instruction for suppressing the amount of power generation, the control device 300 generates power by the power generator. The charging control is performed to charge the storage battery with the surplus power of the stored power except the power supplied to the load facility 400 (charging control instruction). As a result, the power generator can operate without suppressing the output. Hereinafter, the “free capacity” of the storage battery 200 is defined as follows.
Available capacity (unit Ah)=Full charge capacity (unit Ah)×(100−SOC(%))/100
Instead of the free capacity (unit Ah), a free capacity (%)=100-SOC (%) can be used.

On the other hand, when the free capacity of the storage battery 200 is less than the predetermined value, the control device 300 performs the suppression control according to the suppression instruction (suppression control instruction), as shown in FIG. Further, when the control device 300 cannot cover the power consumed by the load equipment 400 with the amount of power generation after the suppression control is performed in accordance with the suppression instruction during the period in which the suppression control is performed according to the suppression instruction. That is, when the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge control is performed to control the storage battery 200 to supply power to the load equipment 400 (discharge control instruction). As a result, it becomes possible to cover the shortage of power generated by the suppression with the power stored in the storage battery without purchasing the power from the grid side. Further, due to this discharge control, the storage battery becomes vacant, so that the next charge control can be performed.

In addition, although the control device 300 has been described as an example in which the control device 300 is independently arranged as the control unit of the charge/discharge control system in the above-described examples of FIGS. 1 to 3, the control unit of the power generation device 100 or the storage battery 200 is described. However, a configuration that functions as a control unit of the charge/discharge control system can also be adopted.

For example, as shown in FIG. 4, the control unit of the power generation device 100a may be caused to perform an operation corresponding to the control device 300. In this case, the power generation device 100a determines whether or not to perform its own suppression control and the instruction content (charge control or discharge control) to the storage battery 200, based on the state of charge (SOC) of the storage battery 200.

Similarly, as shown in FIG. 5, a power storage control device 210a including a storage battery 200a may be caused to perform an operation equivalent to the control device 300. In this case as well, the power storage control device 210a determines, based on the state of charge (SOC) of the storage battery 200, whether or not a control instruction for the power generation device 100 is necessary and the instruction content (charge control or discharge control) to the storage battery 200. It will be decided.

Similarly, as shown in FIG. 6, a configuration in which the control device 300a is arranged on the network can also be adopted. Such a control device 300a may be a physical server or the like physically connected to the network. It is also possible to provide a service equivalent to the control device 300a by using a virtualization server or a virtual network function constructed on the network by using virtualization technology or the like.

[First Embodiment]
Subsequently, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7: is a figure which shows the structure of the charging/discharging control system of the 1st Embodiment of this invention. Referring to FIG. 7, a configuration including PCS 110 connected to PV 120, storage battery 200 connected to power storage controller 210, HEMS 310, and load equipment 400 is shown.

The PV 120 is a device that is also called Photovoltaics, solar photovoltaics, or the like, and performs solar power generation. The PCS (power conditioning system) 110 is a device that converts the DC power output from the PV 120 into AC power. The output from the PCS 110 is supplied to the system side, the load facility 400 or the storage battery 200 side.

The power storage controller 210 is a device that controls charging and discharging of the storage battery 200. Further, the power storage controller 210 monitors the state of charge of the storage battery 200 and provides it to the HEMS 310 as SOC (State Of Charge) information. As the storage battery 200, various secondary batteries such as a nickel hydrogen battery, a lead battery, and a sodium/sulfur battery can be used in addition to the lithium ion battery. Further, as the storage battery 200, a dedicated storage battery may be prepared, but a storage battery installed in an electric vehicle (EV) or a storage battery of a household power storage system may be used.

A HEMS (Home Energy Management System) 310 is a device that is connected to the PCS 110, the power measurement device 500, and the power storage controller 210, and that displays and controls information provided from these. In the present embodiment, the system for home use is assumed and the HEMS is used. It can be replaced with a generic name EMS (Energy Management System). Details of the operation of the HEMS 310 in this embodiment will be described later in detail.

The load facility 400 is a device that consumes electric power, such as various home appliances. The power measurement device 500 is configured to include a CT (Current Transformer) sensor, measures the output power of the PCS 110 and the power consumption of the load equipment 400, and provides the measured power to the HEMS 310. The load facility 400 may be a heat pump utilizing device that can save electric power by converting it into heat energy or potential energy.

FIG. 8 is a functional block diagram showing a configuration example of the HEMS 310. Referring to FIG. 8, the HEMS 310 includes a system side device communication unit 311, a charge/discharge control instruction unit 312, a PCS control unit 313, and a meter monitoring unit 314.

The system-side device communication unit 311 communicates with a management server such as an electric power company or a wide area organization (electric power wide area operation promotion organization) in a predetermined manner. Specifically, when the system side device communication unit 311 receives a power output suppression instruction from a management server of a power company or a wide area organization, the system side device communication unit 311 transfers the content to the charge/discharge control instruction unit 312. Further, the system side device communication unit 311 performs an operation of responding to the management server with a response message (Ack) or the like to the power output suppression instruction.

The PCS control unit 313 is connected to the PCS 110 and provides the current state information of the PCS to the charge/discharge control instruction unit 312. Further, when the PCS control unit 313 receives the output suppression instruction from the charge/discharge control instruction unit 312, the PCS control unit 313 requests the PCS 110 to implement the output suppression according to the content thereof.

The meter monitoring unit 314 receives the difference between the output power of the PCS 110 and the power consumption of the load equipment 400 from the power measuring device 500 and provides it to the charge/discharge control instructing unit 312.

The charge/discharge control instruction unit 312 is connected to each unit of the HEMS 310 and the power storage controller 210, and functions as a charge control unit and a discharge control unit. When the charge/discharge control instructing unit 312 receives the power output suppression instruction from the system side device communication unit 311, it operates as follows. During the period until the output suppression by the output suppression instruction is released, the charge/discharge control instructing unit 312, the charge state of the storage battery 200 received from the power storage controller 210, the output power of the PCS 110 received from the meter monitoring unit 314, and the load equipment 400. Based on the difference in power consumption, it is determined whether the charge/discharge instruction to the power storage controller 210 and the output suppression instruction to the PCS 110 are necessary. The charging/discharging control instructing unit 312 follows (1) a charging control instruction (charging control mode) to the power storage controller 210, (2) an output suppression instruction to the PCS 110, and discharging to the power storage controller 210 as necessary. One of the control instructions (suppression control mode) is executed.

Specific judgment criteria of the charge/discharge control instructing section 312 in this embodiment are as follows.
(1) When the state of charge of the storage battery 200 is less than or equal to the upper threshold value U and the PV output is smaller than the value obtained by adding the power consumption of the load facility 400 and the maximum charging power of the storage battery, the charge/discharge control instructing unit 312 causes the PCS110. The power storage controller 210 is instructed to perform charge control without issuing an output suppression instruction to the side. As a result, it is possible to cope with the output suppression by consuming the power corresponding to the suppression instruction in the load facility 400 or charging the storage battery 200. Further, the charged electric power can be used during the output suppression period or at night when the PV 120 stops generating electricity.

(2) When the state of charge of the storage battery 200 exceeds the upper threshold value U, the charge/discharge control instructing unit 312 instructs the PCS 110 side to perform the output suppression instruction. As a result, when the state of charge of the storage battery 200 exceeds the upper threshold value U, it becomes possible to avoid further charging. Furthermore, in this case, the charge/discharge control instruction unit 312 performs the following control according to the difference between the output power of the PCS 110 after the output suppression and the power consumption of the load equipment 400.

(2-1) When the power consumption of the load equipment 400 is larger than the output power of the PCS 110 after the output is suppressed, the charge/discharge control instruction unit 312 instructs the power storage controller 210 to perform discharge control. This makes it possible to cover the shortage of power consumption of the load facility 400 without procuring power from the grid side. Further, due to this discharging operation, the state of charge of the storage battery 200 is lowered, and the lower threshold L is approached. Finally, when the state of charge of the storage battery 200 becomes equal to or lower than the lower threshold L, the charging operation of (1) above is restarted. As described above, the discharging operation of (2-1) allows the charging operation to be performed a plurality of times during the output suppression control.
(2-2) When the power consumption of the load facility 400 is less than or equal to the output power of the PCS 110 after the output is suppressed, the charge/discharge control instructing unit 312 does not instruct the power storage controller 210 to perform discharge control. This is because the power consumption of the load equipment 400 can be covered even by the electric power during the suppression control. In this case, it is possible to sell the power, which corresponds to the case where the surplus power still occurs while the PV suppresses the output. Of course, if the power consumption of the load facility 400 increases, the above condition (2-1) is satisfied, and discharge control is performed.

Each unit (processing means) of the control device 300 to the HEMS 310 shown in FIGS. 1 to 7 stores the above-mentioned threshold values in the memory of the computer constituting these devices, and uses the hardware to store the above-mentioned threshold values. It can also be realized by a computer program that executes various processes such as comparison with the input value and transmission of an instruction.

Next, the operation of this embodiment will be described in detail with reference to the drawings. FIG. 9 is a flowchart showing the operation of the charge/discharge control system that has received the output suppression instruction according to the first embodiment of the present invention. Referring to FIG. 9, first, the HEMS 310 sets predetermined values for the upper threshold U and the lower threshold L (step S001). The upper threshold U is used as a threshold for stopping charging, and the lower threshold L is used as a threshold for stopping discharging.

Next, the HEMS 310 confirms whether or not the output suppression period according to the output suppression instruction has ended (step S002). Here, when the output suppression period has ended (No in step S002), the normal operation state is restored.

On the other hand, when it is during the output suppression period (Yes in step S002), the HEMS 310 confirms whether the output power P of the PV 120 is less than the power consumption Y of the load equipment 400 (step S003). As a result of the confirmation, when the output power P is less than the power consumption Y of the load equipment 400 (Yes in step S003), the HEMS 310 controls the power supply to the load equipment 400 by purchasing power from the grid or discharging the storage battery. Perform (step S007).

On the other hand, when the output power P is the power consumption Y of the load equipment 400 or more as a result of the confirmation in step S003 (No in step S003), the HEMS 310 determines that the state of charge (SOC) of the storage battery 200 is equal to or lower than a predetermined upper threshold value U. It is confirmed whether or not there is (step S004). Here, when the state of charge (SOC) of the storage battery 200 exceeds the predetermined upper threshold value U (No in step S004), the HEMS 310 proceeds to step S008, and suppresses the output of the PV 120.

On the other hand, when the state of charge (SOC) of the storage battery 200 is less than or equal to the predetermined upper threshold value U (Yes in step S004), the HEMS 310 determines that the sum of the power consumption Y of the load facility 400 and the maximum charging power Zm of the storage battery 200 is the sum. , PV120 It is confirmed whether it is less than the output power P (step S005). Here, when the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200 is less than the output power P of the PV 120 (Yes in step S005), the HEMS 310 performs the charge/discharge control of FIG. Implement (to subroutine S in FIG. 10). The state where the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200 is less than the output power P of the PV 120, in other words, the storage battery 200 itself is in a chargeable state. It can be said that surplus power exceeding the chargeable power is generated.

On the other hand, when the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200 is equal to or higher than the output power P of the PV 120, that is, when Y≦P≦Y+Zm is satisfied, the HEMS 310 is a surplus. The charging control of the storage battery 200 by the electric power is performed (step S006). For example, the content of the output suppression instruction is to instruct to output 70% of the rated power generation amount of 10 kW of the PV 120, the PV 120 is outputting at 8 kW, which is 80% of the rated power, and the power consumption of the load equipment 400 is 6 kW. In this case, the control for charging the storage battery 200 with 2 kW will be performed. As a result, the suppression is achieved by charging the storage battery 200 for 2 kW and consuming 6 kW by the load facility 400 without suppressing the output of the PV 120.

On the other hand, when the state of charge (SOC) of the storage battery 200 exceeds the predetermined upper threshold value U in step S004 (No in step S004), the HEMS 310 transitions to the output suppression mode and controls the output suppression of the PV 120 via the PCS 110. Is carried out (step S008). Also in the output suppression mode, the HEMS 310 confirms whether or not the output suppression period according to the output suppression instruction has ended (step S009). Here, when the output suppression period has ended (No in step S009), the normal operation state is restored.

On the other hand, when it is during the output suppression period (Yes in step S009), the HEMS 310 compares the output power X of the PV 120 after suppression and the power consumption Y of the load equipment 400 (step S010). When the output power X of the PV 120 after the suppression is less than the power consumption Y of the load equipment 400, the HEMS 310 performs discharge control of the storage battery 200 and supplies power that is insufficient to the power consumption Y of the load equipment 400 (step). S011).

On the other hand, when the output power X of the PV 120 after the suppression is equal to or higher than the power consumption Y of the load equipment 400, there is still surplus power while complying with the output suppression, so power sale control to the grid is performed (step. S012).

Next, the HEMS 310 confirms whether the state of charge (SOC) of the storage battery 200 is less than or equal to a predetermined lower threshold L (step S013). When the state of charge (SOC) of the storage battery 200 exceeds the predetermined lower threshold value L, there is remaining capacity for discharging, so the HEMS 310 returns to step S009 and continues the output suppression mode.

On the other hand, when the state of charge (SOC) of the storage battery 200 is less than or equal to the predetermined lower threshold L, the HEMS 310 exits the discharge routine and returns to step S002. That is, since the state of charge (SOC) of the storage battery 200 has fallen below the lower threshold value L, the supply of the storage battery to the load due to discharge of the storage battery during output suppression is stopped, and during the suppression instruction period, the output power P of the PV 120 is again set. And control according to the power consumption Y of the load equipment 400 is restarted.

Next, in step S005, if the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200 is less than the output power P of the PV 120, that is, the storage battery 200 itself is in a chargeable state. However, the operation of the HEMS 310 (subroutine S in FIG. 9) when surplus power exceeding the chargeable power is generated will be described.

FIG. 10 is a flow chart showing the operation after the subroutine S in FIG. Referring to FIG. 10, first, the HEMS 310 implements the output suppression control of the PV 120 via the PCS 110 (step S500). Next, the HEMS 310 compares the output power X of the PV 120 after the suppression with the power consumption Y of the load equipment 400 (step S501). When the output power X of the PV 120 after the suppression is less than the power consumption Y of the load equipment 400 (Yes in step S501), the HEMS 310 determines whether the output suppression period is in progress (step S502). The HEMS 310 returns to normal operation when it is outside the output suppression period.

When it is determined in step S502 that the output suppression period is in progress, the HEMS 310 performs discharge control of the storage battery 200 or receives supply from the grid side (power purchase) (step S503). Next, the HEMS 310 confirms whether the state of charge (SOC) of the storage battery 200 is less than or equal to a predetermined lower threshold L (step S504). When the state of charge (SOC) of the storage battery 200 exceeds the predetermined lower threshold value L, there is remaining capacity for discharging, so the HEMS 310 returns to step S501. Further, when the state of charge (SOC) of the storage battery 200 is equal to or lower than the predetermined lower threshold value L, further discharge is unnecessary, so the process proceeds to the subroutine M and returns to step S002 in FIG. 9.

On the other hand, in step S502, when the output power X of the PV 120 after the suppression is equal to or higher than the power consumption Y of the load equipment 400, the HEMS 310 calculates the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200. Instead, it is confirmed whether the output power X of the PV 120 being suppressed is larger (step S505). Here, when the output power X during the suppression of the PV 120 exceeds the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200, the surplus power is still generated even when the load equipment 400 is charged. There will be. In this case, the HEMS 310 sells power to the grid side while charging the storage battery 200 (step S506).

On the other hand, in step S505, when the output power X during the suppression of the PV 120 is less than or equal to the sum of the power consumption Y of the load equipment 400 and the maximum charging power Zm of the storage battery 200, the HEMS 310 determines the maximum charging power of the storage battery 200. Zm is compared with the output power X of the PV 120 during suppression (step S507). As a result of the comparison, when the maximum charging power Zm of the storage battery 200 is less than the output power X of the PV 120 being suppressed, the HEMS 310 charges the storage battery 200 with the surplus power of the output power X of the PV 120 being suppressed ( Step S508).

On the other hand, in step S507, when the maximum charging power Zm of the storage battery 200 is equal to or higher than the output power X of the PV 120 being suppressed, the HEMS 310 raises the output power X of the PV 120 being suppressed to Zm and the surplus. The storage battery 200 is charged with electric power (step S509).

FIG. 11 is a timing chart for explaining the charge/discharge processing by the HEMS 310 described above. In the example of FIG. 11, after the suppression instruction is received, the state of charge (SOC) of the storage battery 200 is equal to or lower than the upper threshold value U as shown in the upper graph, so that the charge control is immediately performed. As shown in the lower part of FIG. 11, output suppression is not performed during this period, and the PCS 110 is operating at 100% output. The area of the region sandwiched between the line indicating the load power consumption (dashed line) in FIG. 11 and the line indicating the photovoltaic power generation corresponds to the amount of power generation that avoids suppression.

By the charge control, when the state of charge (SOC) of the storage battery 200 exceeds the upper threshold value U, the suppression of the output of the PV 120 is started. In the example of FIG. 11, since the power consumption Y of the load equipment 400 was equal to or lower than the output power X of the PV 120 for a certain period immediately after that, discharge control is not performed and power sale is performed (the upper part of FIG. 11, “discharge”). No" section). The area of the region sandwiched between the line showing the load power consumption (dashed line) in FIG. 11 and the line showing the photovoltaic power generation shows the power that can be sold.

After that, since the power consumption Y of the load equipment 400 exceeds the output power X of the PV 120, discharge control of the storage battery 200 is being performed (“discharge” in the upper graph of FIG. 11 ). In the example of FIG. 11, thereafter, the discharge control is performed again after the discharge is once stopped. Finally, when the state of charge (SOC) of the storage battery 200 becomes equal to or lower than the lower threshold L, the charge control is executed again. After that, the charge control and the discharge control are similarly repeated until the output suppression period according to the output suppression instruction ends.

As described above, according to this embodiment, the charge control and the discharge control are repeated. As a result, during the output suppression period, the power to be purchased can be reduced by appropriately generating power and charging the storage battery 200 instead of continuously suppressing the output as shown in FIG.

(Reference example)
A case in which the charge control and the discharge control are not performed as in the present embodiment will be described as a reference example. FIG. 21 is a diagram showing the relationship among the amount of power generation, load consumption, and power balance in the photovoltaic power generation facility that may receive the output suppression instruction to the PV. The portion of the photovoltaic power generation output in the figure that exceeds the load consumption indicates surplus power, that is, power that can be sold. In the example of FIG. 21, after the time t1, the power generation amount increases and surplus power is generated. After that, as it approaches noon after noon, the amount of power generation decreases, but the load consumption increases, and after time t2, a shortage of electric power occurs, and the electric power must be procured from the grid side. There is.

In such a photovoltaic power generation facility, for example, as shown in FIG. 22, when the suppression control for suppressing the output to 40% (the rated output is 100%) is performed between 9:00 am and 15:00 am, from 9:00 am Until time t3, the power generation amount exceeds the load power consumption, and thus it is possible to sell power. During the subsequent period from time t3 to time t2, the load consumption amount exceeds the power generation amount after the suppression instruction is applied. Originally, during this period, it is not necessary to suppress the output to 40%, and power should be generated as long as the load consumption exceeds the amount of power generation after applying the suppression instruction. However, if it does not have the function of suppressing the amount of power generation within the range where reverse power flow is not generated, the output instruction value for the power generation equipment is maintained at 40%. As a result, in this type of photovoltaic power generation facility, even in the period from the time t3 to the time t2, the power must be purchased from the grid side. As described above, in a photovoltaic power generation facility that cannot perform power generation control linked to load consumption, it may happen that power must be purchased from outside even during a period in which it is not necessary to purchase power from outside. Similar circumstances can occur not only in solar power generation but also in power generation equipment using other renewable energy.

On the other hand, according to the present embodiment as described above, the charge control and the discharge control are repeated even during the period when the output suppression is instructed. As a result, it is possible to perform economical operation even when the output suppression instruction is received.

Power generation by the PV 120 is limited during the daytime, and it is economical to take out necessary power from the storage battery 200 at night. In view of this, it is preferable that the storage battery 200 be fully charged at the time of the evening. Further, that the storage battery is just fully charged at the end of the output suppression period means that the storage battery is effectively used to store the PV surplus power. On the other hand, in the present embodiment, since the charge control and the discharge control are repeated, depending on the timing, the output power of the PV 120 may become 0 before the full charge state is reached. In order to fully charge the storage battery 200 at the evening time, as shown in FIG. 12, the charging control mode is forcibly changed at a certain time so that the battery is fully charged at the last charging control. It is conceivable to operate the HEMS 310. Alternatively, after a certain time in the afternoon, the discharge control may be suppressed by the HEMS 310 so that the storage battery 200 is maintained in the fully charged state.

[Second Embodiment]
Next, a second embodiment will be described in which the lower threshold L is increased from a low value to a high value so that the storage battery 200 is in a state close to a fully charged state at the evening time. The basic configuration is the same as that of the first embodiment, and the only difference from the first embodiment is the operation of the HEMS 310 according to the threshold value. Therefore, the difference in operation will be mainly described below.

FIG. 13 is a flowchart showing the operation of the charge/discharge control system according to the second embodiment of the present invention. In the present embodiment, when the suppression instruction is received, the HEMS 310 first sets the lower threshold L and the upper threshold U to predetermined initial values (for example, the charging amount 20 when the fully charged state is 100% as the lower threshold L). %, the upper threshold value U is set to 80%) (step S101). The subsequent operation is the same as that of the first embodiment. First, when the output suppression period is in progress and the state of charge (SOC) of the storage battery 200 is the upper threshold U or less (Yes in step S004), the HEMS 310 determines The charging of the storage battery 200 is started on the condition that the sum of the power consumption Y of the load facility 400 and the maximum charging power Zm of the storage battery 200 is equal to or higher than the output power P of the PV 120.

When the state of charge (SOC) of the storage battery 200 exceeds the upper threshold value U by the charge control, the HEMS 310 makes a transition to the suppression control mode and starts a power generation suppression instruction (step S008 in FIG. 13 ). After that, when the power consumption Y of the load equipment 400 is larger than the output power X of the PCS 110 (Yes in step S010), the HEMS 310 performs discharge control in an amount that can cover the power consumption of the load equipment (Yes). Step S011). The difference from the first embodiment is that a predetermined value is added to the lower threshold L after the discharge routine ends during the PV output suppression instruction period (step S014). As a result, as compared with the first embodiment, the charging control for the second time and thereafter is gradually started. However, when the lower threshold L reaches a predetermined upper limit value (for example, 80%), the addition in step S014 is unnecessary.

FIG. 14 is a timing chart for explaining the operation of the charge/discharge control system of the second embodiment in which the lower threshold L is gradually increased. Referring to FIG. 14, the first charge operation to the first half of the discharge operation are the same as those in the first embodiment. However, since the lower threshold L is added after the discharge routine ends during the PV output suppression instruction period (indicated as L1, L2, and L3 in FIG. 14 ), the second charging is the charging of the storage battery 200. It is started when the state (SOC) becomes L2 (L2>L1). Similarly, the third charging is started when the state of charge (SOC) of the storage battery 200 becomes L3 (L3>L2).

According to the second embodiment in which the charging/discharging operation is repeated in this manner, the storage battery 200 is brought into a state close to the fully charged state at the end of the suppression instruction without performing the “final charging control” as shown in FIG. 12. Is possible. Of course, also in the second embodiment, the “last charge control” as shown in FIG. 12 may be performed. Even in this case, according to the second embodiment, the storage battery approaches the fully charged state while repeating the charging/discharging operation, so that there is an effect that the required period of the “last charging control” can be shortened. .. Further, instead of the “final charge control”, the discharge control may be suppressed by the HEMS 310 so that the storage battery 200 is maintained in a fully charged state after a certain time in the afternoon.

[Third Embodiment]
Next, a third embodiment will be described in which the storage battery 200 is brought into a state close to a fully charged state at the evening time point by shortening the discharge control period. The basic configuration is the same as that of the first embodiment, and the difference from the first embodiment is that the duration of discharge control in the HEMS 310 is shortened. Hereinafter, the difference in operation will be mainly described.

FIG. 15 is a flowchart showing the operation of the charge/discharge control system of the third exemplary embodiment of the present invention. Referring to FIG. 15, first, the HEMS 310 sets a predetermined initial value for the discharge control period Tx and the upper threshold value U (the discharge control period Tx is, for example, several tens of minutes) (step S301). Thereafter, similarly to the first and second embodiments, when the HEMS 310 is in the output suppression period and the storage battery 200 is in the chargeable state (Yes in step S004), the power consumption Y of the load equipment 400 is The charging of the storage battery 200 is started on the condition that the sum of the maximum charging power Zm of the storage battery 200 is equal to or higher than the output power P of the PV 120.

When the state of charge (SOC) of the storage battery 200 exceeds the upper threshold U by the charge control, the HEMS 310 transitions to the suppression control mode (step S308-1), and sets the discharge control period Tx in the timer Ty. (Step S308-2), the instruction for suppressing the amount of power generation is started. After that, the HEMS 310 subtracts the predetermined value α from the timer Ty (step S313; Ty=Ty−α). Next, the HEMS 310 is different from the first and second embodiments in that the discharge control is ended when the value of the timer Ty becomes 0 or less during the discharge control (step S314). .. Further, the HEMS 310 shortens the discharge period by subtracting the predetermined time β from the discharge control period Tx after the end of the discharge routine during the PV output suppression instruction period. As a result, the discharge control period is set to be gradually shorter than that in the first embodiment.

FIG. 16 is a timing chart for explaining the operation of the charge/discharge control system of the third embodiment in which the discharge control period is gradually shortened. Referring to FIG. 16, the first charge operation to the first half of the discharge operation are the same as those in the first embodiment. However, since the dischargeable period t1 has been reached while the power is being sold to the grid, the system is transitioning to the charge control mode. Furthermore, the second and subsequent discharges are finished when a shorter dischargeable period t2 (t2<t1) has elapsed.

According to the third embodiment in which the charging/discharging operation is repeated in this manner, it becomes possible to bring the storage battery 200 into a state close to the fully charged state at the end of the suppression instruction without operating the lower threshold L. Of course, also in the third embodiment, the “last charge control” as shown in FIG. 11 may be performed. Even in this case, according to the third embodiment, the storage battery approaches the fully charged state while repeating the charging/discharging operation, so that there is an effect that the required period of the “last charging control” can be shortened. .. Also in the present embodiment, instead of the “last charge control”, the discharge control may be suppressed by the HEMS 310 so that the storage battery 200 is maintained in the fully charged state after a certain time in the afternoon.

In the above example, the upper limit is set in the discharge control period and is gradually shortened. However, the same effect can be obtained by setting the upper limit in the charge control period and gradually shortened.

[Fourth Embodiment]
Subsequently, a description will be given of a fourth embodiment in which the two threshold values L and U are increased from a low value to a high value so that the storage battery 200 is in a state close to a fully charged state at the evening time. To do. The basic configuration is the same as that of the first embodiment, and the only difference from the first embodiment is the operation of the HEMS 310 according to the threshold value. Therefore, the difference in operation will be mainly described below.

FIG. 17 is a flow chart showing the operation of the charge/discharge control system of the fourth exemplary embodiment of the present invention. Referring to FIG. 17, the HEMS 310 first sets a predetermined initial value for the upper threshold value U and the lower threshold value L (for example, U is a charge amount of 60% and L is 10%) (step S401). The subsequent operation is similar to that of the second embodiment. First, when the output suppression period is in progress and the state of charge (SOC) of the storage battery 200 is not more than the upper threshold value U (Yes in step S004), the HEMS 310 determines The charging of the storage battery 200 is started on the condition that the sum of the power consumption Y of the load facility 400 and the maximum charging power Zm of the storage battery 200 is equal to or higher than the output power P of the PV 120.

When the state of charge (SOC) of the storage battery 200 exceeds the upper threshold U by the charge control, the HEMS 310 makes a transition to the suppression control mode, starts the instruction to suppress the amount of power generation, and outputs the load power 400 rather than the output power X of the PCS 110. If the power consumption Y is higher (Yes in step S010), the HEMS 310 performs discharge control in an amount that can cover the power consumption of the load equipment (step S011). The difference from the first embodiment is that the addition end condition such that the upper threshold value U and the lower threshold value L reach predetermined upper limit values (for example, upper limit threshold values Lm, Um) after the discharge routine ends during the PV output suppression instruction period. This is a point where a predetermined value is added to the upper threshold value U and the lower threshold value L (step S415) until is satisfied (step S414). The values added to the respective thresholds may be the same or different. Further, instead of adding a constant value, the increment may be changed as the number of charge/discharge increases. As a result, control is performed such that the charging amount of the storage battery 200 gradually increases while repeating charging/discharging in a shorter cycle than in the first embodiment.

FIG. 18 is a timing chart for explaining the operation of the charge/discharge control system of the fourth embodiment in which the upper threshold value U and the lower threshold value L are gradually increased. Referring to FIG. 18, the charging operation of one cycle has a shorter period as compared with the first embodiment. After that, as the charging/discharging is repeated, the upper threshold value U and the lower threshold value L are added, so that the charging amount of the storage battery 200 increases.

According to the fourth embodiment in which the charging/discharging operation is repeated in this manner, the storage battery 200 is brought into a state close to the fully charged state at the end of the suppression instruction without performing the “final charging control” as shown in FIG. Is possible. Of course, also in the fourth embodiment, the “last charge control” as shown in FIG. 12 may be performed. Even in this case, according to the second embodiment, the storage battery approaches the fully charged state while repeating the charging/discharging operation, so that there is an effect that the required period of the “last charging control” can be shortened. .. Further, instead of the “final charge control”, the discharge control may be suppressed by the HEMS 310 so that the storage battery 200 is maintained in a fully charged state after a certain time in the afternoon.

Further, in the fourth embodiment, the two threshold values L and U have been described to be increased from low values to high values, but a modified configuration in which only the upper threshold value U is increased can also be adopted.

[Fifth Embodiment]
In the second to fourth embodiments described above, the storage battery 200 is brought into a state close to full charge by changing the threshold value for switching charging/discharging. However, for example, the change in the power consumption of the load equipment 400 on the HEMS 310 side. If it can be guessed, finer control can be performed.

FIG. 19: is a functional block diagram which shows the structural example of HEMS of the charge/discharge control system of the 5th Embodiment of this invention. The difference from the HEMS 310 of the first embodiment shown in FIG. 8 is that a power consumption storage unit 315 that stores statistical information that stores the transition of the power consumption of the load equipment is added in the HEMS 310a. ..

The HEMS 310 of the present embodiment refers to the statistical information of the power consumption storage unit 315, and performs discharge control and charge control so that the storage battery is in a predetermined full charge state at the end of the suppression period according to the power generation amount suppression instruction. To execute. For example, when it is known that the power consumption of the load equipment 400 sharply increases due to the family returning home in a specific time period in the afternoon every day, the HEMS 310a of the present embodiment speeds up the time for executing the final charge control, After that, control is performed to suppress the discharging process even if the battery is fully charged.

With this configuration, the storage battery 200 can be more fully charged at the end of the output suppression control.

Although the respective embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications, replacements, and adjustments can be made without departing from the basic technical idea of the present invention. Can be added. For example, the network configuration, the configuration of each element, and the expression form of a message shown in each drawing are examples for helping understanding of the present invention, and are not limited to the configurations shown in these drawings. For example, it is possible to combine the change of the threshold value according to the first, second, and fourth embodiments with the change of the discharge control period according to the third embodiment. Furthermore, it is possible to combine the second to fourth embodiments with charge/discharge control using the power consumption storage unit 315 of the fifth embodiment.

Further, in the above-described embodiment, the power generator is described as an example assuming a solar power generator, but the present invention is a power generator that generates power with renewable energy such as wind power, water power, tidal power, and geothermal heat. The same can be applied to the case where a configuration in which these are mixed is provided.

Further, in addition to the storage battery of the above-described embodiment, a heat pump utilizing device or the like may be connected. In this case, even if the storage battery 200 is fully charged, the heat pump utilizing device can convert all or part of the power to be suppressed into heat energy or potential energy and store the heat energy or potential energy. As a result, it is possible to meet the energy demand at night and the like.

Finally, a preferred form of the invention is summarized.
[First mode]
(Refer to the charge/discharge control system according to the first aspect above)
[Second mode]
In the charge/discharge control system according to the first aspect,
The control unit is
A charging/discharging control system that alternately performs discharging control and charging control so that the storage battery is brought into a predetermined fully charged state at the end of the suppression period according to the power generation amount suppression instruction.
[Third mode]
In the charge/discharge control system according to the second aspect,
The control unit is
A charging/discharging control system in which a discharging end threshold in one cycle of charging/discharging control is increased as the end of the suppression period based on the power generation amount suppression instruction approaches.
[Fourth form]
In the charge/discharge control system according to the second or third aspect,
The control unit is
A charging/discharging control system that reduces the charging/discharging amount of the storage battery by one-cycle charging/discharging control as the end of the suppression period based on the power generation suppression command is approached.
[Fifth form]
In the charge/discharge control system according to the third aspect,
The control unit is
Charge/discharge control that reduces the charge/discharge amount of the storage battery by the 1-cycle charge/discharge control by shortening the 1-cycle charge/discharge control period as the end of the suppression period by the power generation amount suppression instruction approaches. system.
[Sixth form]
Further, the control unit is
A charging/discharging control system that decreases the predetermined value as the end of the suppression period based on the power generation suppression instruction is approached.
[Seventh form]
In the charge-discharge control system according to the first to fifth aspects,
Further, a power consumption storage unit that stores statistical information that stores the transition of the power consumption of the load equipment,
The control unit is
A charge/discharge control system that refers to the statistical information in the power consumption storage unit and executes discharge control and charge control so that the storage battery is brought into a predetermined full charge state at the end of a suppression period based on an instruction to suppress the amount of power generation.
[Eighth mode]
(Refer to the control device from the above second viewpoint)
[Ninth mode]
(Refer to the charge/discharge control method according to the third aspect above)
[Tenth form]
(Refer to the computer program from the above fourth viewpoint)
The eighth to tenth modes can be expanded to the second to seventh modes as in the first mode.

The disclosures of the above-mentioned patent documents and non-patent documents are incorporated herein by reference. Modifications and adjustments of the exemplary embodiments and examples are possible within the scope of the overall disclosure (including the claims) of the present invention and based on the basic technical concept thereof. Further, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the scope of the disclosure of the present invention. Is. That is, it goes without saying that the present invention includes various variations and modifications that can be made by those skilled in the art according to the entire disclosure including the claims and the technical idea. In particular, with regard to the numerical range described in this specification, any numerical value or small range included in the range should be construed as being specifically described even if not otherwise specified.

100, 100a Power generator 110 PCS (Power Conditioning System)
120 PV
200, 200a Storage battery 210 Electric storage controller 210a Electric storage control device 300, 300a Control device 310, 310a HEMS
311 System side device communication unit 312 Charge/discharge control instruction unit 313 PCS control unit 314 Meter monitoring unit 315 Power consumption storage unit 400 Load facility 500 Power measurement device

Claims (16)

A power generator for supplying power to the load facility or supplying surplus power to the grid side;
The surplus power from the power generator is stored, or a storage battery capable of supplying the stored power to the load facility,
A control unit for receiving a power generation amount suppression instruction from an external device,
The control unit, in the period instructed by the instruction to suppress the amount of power generation,
When the free capacity of the storage battery is equal to or greater than a predetermined value, the charging control is performed to charge the storage battery with surplus power of the power generated by the power generator,
If the free capacity of the storage battery has become smaller than the predetermined value, performing the suppression control in accordance with the restriction instruction,
In the period of performing the suppression control according to the suppression instruction, if the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge to control to supply power to the load equipment from the storage battery. Implement control , and
At the end of the suppression period according to the suppression instruction of the power generation amount, alternately performing discharge control and charge control so that the storage battery is in a predetermined full charge state,
Charge/discharge control system characterized by. The control unit is
The charge/discharge control system according to claim 1, wherein a discharge end threshold in one cycle of charge/discharge control is increased as the end of the suppression period based on the instruction for suppressing the amount of power generation is approached. The control unit is
The charge/discharge control system according to claim 1 or 2 , wherein the charge/discharge amount of the storage battery is reduced by one-cycle charge/discharge control as the end of the control period based on the power generation amount control instruction approaches. The control unit is
According approach the end of the inhibition period by the amount of power generated by the suppression instruction, one period of the charge and discharge control of the cycle by a shorter, the cycle of charge and discharge control claim gradually reduce the charge and discharge amount of the battery by 1 To 3 any one charge/discharge control system. Further, the control unit is
The charge/discharge control system according to any one of claims 1 to 4 , wherein the predetermined value is decreased as the end of the suppression period by the suppression instruction of the power generation amount approaches. Furthermore, a power consumption storage unit that stores statistical information that stores the transition of the power consumption of the load facility,
The control unit is
With reference to the statistical information of the power storage unit, from claim 1, wherein the storage battery at the end of the inhibition period by the amount of power generated by the suppression instruction to execute charge control and discharge control to be a predetermined fully charged state 5 Any one charge/discharge control system. An instruction to suppress the amount of power generation in the power generation device, and a communication unit that receives the state of the storage battery,
In the period instructed by the suppression instruction, when the free capacity of the storage battery is a predetermined value or more, a charging control unit for charging the storage battery with surplus power of the power generated by the power generator,
In the period instructed by the suppression instruction, when the free capacity of the storage battery is less than a predetermined value, a power generation control unit that suppresses power generation according to the suppression instruction,
In the period of performing the suppression control according to the suppression instruction, when the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge for discharging the storage battery to supply power to the load equipment. With a control unit ,
A control device that alternately executes discharge control and charge control so that the storage battery is in a predetermined fully charged state at the end of a suppression period according to the power generation amount suppression instruction . The control device according to claim 7, wherein a discharge end threshold value in one cycle of charge/discharge control is increased as the end of the suppression period based on the suppression instruction of the power generation amount approaches. 9. The control device according to claim 7, wherein the charge/discharge amount of the storage battery is reduced by one-cycle charge/discharge control as the end of the suppression period based on the power generation amount suppression instruction approaches. According approach the end of the inhibition period by the amount of power generated by the suppression instruction, one period of the charge and discharge control of the cycle by a shorter, the cycle of charge and discharge control according to claim 7 to continue to reduce the discharge amount of the battery by To 9 any one control device. The control device according to any one of claims 7 to 10 , wherein the predetermined value is decreased as the end of the suppression period based on the suppression instruction of the power generation amount approaches. Furthermore, a power consumption storage unit that stores statistical information that stores the transition of the power consumption of the load facility,
With reference to the statistical information of the power storage unit, from claim 7 wherein the battery at the end of the inhibition period by the amount of power generated by the suppression instruction to execute charge control and discharge control to be a predetermined fully charged state 11 Any one control device. The control device according to any one of claims 7 to 12, which is arranged in the storage battery and functions as a charging control unit that controls charging and discharging of the storage battery. The control device according to claim 7 , wherein the control device is disposed in the power generation device and functions as a power conditioning system that controls an output of the power generation device. A power generator for supplying power to the load facility or supplying surplus power to the grid side;
The surplus power from the power generator is stored, or a storage battery capable of supplying the stored power to the load facility,
A control unit that receives a power generation amount suppression instruction from an external device,
In a charge/discharge control system including
During the period instructed by the power generation suppression instruction,
When the free capacity of the storage battery is equal to or greater than a predetermined value, the charging control is performed to charge the storage battery with surplus power of the power generated by the power generator,
When the free capacity of the storage battery is less than a predetermined value, the suppression control is performed according to the suppression instruction,
In the period of performing the suppression control according to the suppression instruction, if the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge to control to supply power to the load equipment from the storage battery. Control ,
Alternately executing the discharge control and the charge control so that the storage battery is in a predetermined full charge state at the end of the suppression period according to the suppression instruction of the power generation amount,
And a charge/discharge control method. A power generator for supplying power to the load facility or supplying surplus power to the grid side;
The surplus power from the power generator is stored, or a storage battery capable of supplying the stored power to the load facility,
A control unit that receives a power generation amount suppression instruction from an external device,
To a computer that constitutes a charge/discharge control system including
During the period instructed by the power generation suppression instruction,
When the free capacity of the storage battery is equal to or greater than a predetermined value, a process of performing charging control for charging the storage battery with surplus power of the power generated by the power generator,
When the free capacity of the storage battery is less than a predetermined value, a process of performing suppression control according to the suppression instruction,
In the period of performing the suppression control according to the suppression instruction, if the power supplied to the load equipment exceeds the power suppressed by the suppression instruction, discharge to control to supply power to the load equipment from the storage battery. Execute the process to control ,
At the end of the suppression period by the suppression instruction of the power generation amount, alternately performing the process of performing the discharge control and the process of performing the charge control so that the storage battery is in a predetermined full charge state,
A program characterized by.

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