JP7241334B2 - control system, program - Google Patents

Description

The present disclosure relates to a control system and program for measuring capacity of a storage battery.

A storage battery is connected to an electrical device placed in a home or office. With this connection, electric power charged in the storage battery is supplied to the electrical equipment when a power failure occurs, so the electrical equipment can be used even during a power failure. Therefore, when there is a possibility of power outage, it is desirable to increase the amount of electric power charged in the storage battery. In order to deal with this, charging of the storage battery is started based on weather information (see, for example, Patent Document 1).

WO 16/185760

If the storage battery is, for example, a lithium ion storage battery, the chargeable capacity of the storage battery decreases as the storage battery is used. Therefore, it is necessary to grasp the capacity of the storage battery in order to improve the accuracy of control of charging and discharging of the storage battery. In order to grasp the capacity of the storage battery, capacity measurement processing for measuring the capacity of the storage battery is executed. In the capacity measurement process, the remaining capacity of the storage battery is made substantially zero. If a power outage occurs when the remaining amount is substantially zero, power supply by the storage battery becomes impossible. Therefore, it is not desirable to perform the capacity measurement process when there is a high possibility that a power outage will occur.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a technique for stopping the storage battery capacity measurement process when there is a high possibility of a power failure.

In order to solve the above problems, a control system according to one aspect of the present disclosure is a control system that controls a power storage system that includes a storage battery and a charging/discharging circuit that charges/discharges the storage battery, and operates the charging/discharging circuit. and a control unit for executing capacity measurement processing for measuring the capacity of the storage battery, and an acquisition unit for acquiring the issuance of a weather warning. The capacity measurement process in the control unit consists of a first step of discharging the storage battery and setting the remaining amount of the storage battery to substantially zero, and a second step of charging the storage battery whose remaining amount is substantially zero to full charge. and the control unit suspends the discharge of the storage battery by suspending the execution of the capacity measurement process when the acquisition unit acquires the issuance of a weather warning during the execution of the first step of the capacity measurement process. Controlling the charging/discharging circuit, if the acquisition unit acquires the issuance of a weather warning during execution of the second step of the capacity measurement process, continue the execution of the capacity measurement process to charge/discharge the storage battery. keep the circuit under control .

It should be noted that any combination of the above-described components and expressions of the present disclosure converted between methods, devices, systems, computer programs, recording media recording computer programs, etc. are also effective as aspects of the present disclosure. be.

According to the present disclosure, it is possible to stop the storage battery capacity measurement process when there is a high possibility of a power outage.

It is a figure which shows the structure of the power distribution system which concerns on an Example. 2 is a diagram showing the configuration of the control system of FIG. 1; FIG. FIG. 3 is a diagram showing an overview of capacitance measurement processing by the control unit in FIG. 2; 3 is a flow chart showing a procedure of capacity measurement processing by the control system of FIG. 2;

Before specifically describing the embodiments of the present disclosure, an outline of the present embodiments will be described. An embodiment relates to a power distribution system in which a storage battery is connected to a power system. The power distribution system charges a storage battery with power from the power system, and supplies power from the power system and the storage battery to a load device. The charging and discharging of this storage battery is controlled by a control system. The control system discharges the storage battery during power outages and charges the storage battery at night when the unit price of electricity is low for peak shift. For example, the storage battery is discharged during the daytime. Such power storage systems, control systems, and load devices are installed, for example, in facilities (hereinafter referred to as “consumers”) that receive power supply from the power system.

As described above, when the storage battery is, for example, a lithium ion storage battery, the chargeable capacity of the storage battery decreases as the storage battery is used. Under such circumstances, even if the charge/discharge of the storage battery is controlled based on the past capacity, the accuracy of the control decreases. In order to improve the accuracy of controlling charging and discharging of a storage battery, it is necessary to periodically grasp the capacity of the storage battery. The capacity of the storage battery is grasped by executing capacity measurement processing for measuring the capacity of the storage battery. In the capacity measurement process, for example, after a first step of discharging the storage battery until the remaining amount of the storage battery becomes substantially zero, a second step of charging the storage battery to full charge is performed. Here, the amount of electric power charged in the second step indicates the capacity of the storage battery. If a power failure occurs when the capacity measurement process indicates that the remaining amount of the storage battery is substantially zero, it becomes impossible to supply power from the storage battery to the load device. Therefore, it is not desirable to discharge the storage battery by executing the capacity measurement process when there is a high possibility that a power failure will occur.

To accommodate this, the control system according to this embodiment is connected to a server via a network. The server provides weather information, one of the weather information is a weather warning. When a weather warning is issued, the possibility of a power outage increases due to heavy rain or strong wind. When the control system acquires the issuance of alarm information from the server via the network, it stops executing the volume measurement process.

FIG. 1 shows the configuration of a power distribution system 100. As shown in FIG. The power distribution system 100 is connected to a power grid 10 and includes a distribution board 12 , load devices 14 , an electricity storage system 20 , and a control system 30 . The electricity storage system 20 includes a charging/discharging circuit 22 and a storage battery 24 . Also, the control system 30 is connected to a network 40 and a server 42 . The charging/discharging circuit 22 and the storage battery 24 may be separate devices, or may be integrated as one device. The distribution board 12, the load device 14, the power storage system 20, and the control system 30 are installed in the consumer. Consumers are, for example, single-family homes, collective housing such as condominiums, stores such as convenience stores or supermarkets, commercial facilities such as buildings, and factories. A consumer is a facility that receives power supply from an electric power company or the like.

The power system 10 is equipment of a power company or the like, and provides commercial power to consumers. The distribution board 12 is connected to the power system 10 . Moreover, the distribution board 12 connects the load device 14 and supplies power to the load device 14 . The load device 14 is a device that consumes power supplied from the distribution board 12 . The load device 14 includes devices such as an air conditioner (air conditioner), a television receiver (television), a lighting device, and a refrigerator. Although one load device 14 is connected to the distribution board 12 here, a plurality of load devices 14 may be connected to the distribution board 12 .

The storage battery 24 can charge and discharge electric power, and is configured by a plurality of storage battery cells connected in series or in series-parallel. A lithium ion storage battery, a nickel-hydrogen storage battery, a lead storage battery, an electric double layer capacitor, a lithium ion capacitor, etc. are used for a storage battery cell. An electric double layer capacitor may be used as the storage battery 24 . Here, it is assumed that it is a lithium ion storage battery.

The charging/discharging circuit 22 is arranged between the distribution board 12 and the storage battery 24 . The charge/discharge circuit 22 charges and discharges the storage battery 24 . Specifically, the charging/discharging circuit 22 converts the AC power from the distribution board 12 into DC power and charges the storage battery 24, and converts the DC power discharged from the storage battery 24 into AC power for distribution. The electric board 12 is made to output. The AC power output to the distribution board 12 is consumed in the load equipment 14 .

The control system 30 is connected to the charge/discharge circuit 22 and controls the power storage system 20 including the charge/discharge circuit 22 and the storage battery 24 . The configuration of the control system 30 will be described later. Control system 30 has a communication function and is connected to network 40 . The network may be a wired network, a wireless network, or a combination thereof. The server 42 is installed outside the consumer. The server 42 manages, for example, weather information announced by the Japan Meteorological Agency. In the weather information, special warnings, warnings, and warnings are set for each category such as heavy rain or storm. Here, special warnings and warnings correspond to weather warnings, but weather warnings may include advisories. The server 42 transmits weather information. Here, attention is focused on cases where weather warnings are included in weather information, and when weather warnings are no longer included in weather information.

FIG. 2 shows the configuration of the control system 30. As shown in FIG. The control system 30 includes a control section 50 , a monitoring section 52 and an acquisition section 54 . As illustrated, the control system 30 may be a single device including the control unit 50, the monitoring unit 52, and the acquisition unit 54, or the control unit 50, the monitoring unit 52, and the acquisition unit 54 may be included in multiple devices. may In the latter case, for example, the control unit 50 and the monitoring unit 52 are included in the charge/discharge circuit 22, and the acquisition unit 54 is included in another device.

A monitoring unit 52 measures the voltage of the storage battery 24 in FIG. The monitoring unit 52 outputs the measured voltage (hereinafter referred to as “voltage information”) to the control unit 50 . In addition, the monitoring unit 52 measures the integrated amount of current output from the storage battery 24 and the integrated amount of current input to the storage battery 24 during the period specified by the control unit 50 . The monitoring unit 52 outputs the measured integrated current amount (hereinafter referred to as “integrated current amount information”) to the control unit 50 .

Control unit 50 receives voltage information from monitoring unit 52 . The control unit 50 controls the operation of the charging/discharging circuit 22 based on the voltage information. This corresponds to controlling charging and discharging of the storage battery 24 . For example, when the voltage is less than the threshold value, the controller 50 causes the charging/discharging circuit 22 to charge the storage battery 24 . When the voltage is less than the threshold, it corresponds to the case where the remaining capacity of the storage battery 24 is low. Also, the control unit 50 may cause charging and discharging to be performed according to the time period. For example, the control unit 50 operates the charging/discharging circuit 22 so as to charge the storage battery 24 at night when the unit price of electricity is low and discharge the storage battery 24 during the daytime when the unit price of electricity is high. Since a well-known technique may be used for such charge/discharge control by the control unit 50, description thereof is omitted here.

In addition to this, the control unit 50 periodically, for example, once a year or once a month, operates the charging/discharging circuit 22 to execute capacity measurement processing for measuring the capacity of the storage battery 24. . As described above, when the storage battery 24 is a lithium ion storage battery, the chargeable capacity of the storage battery 24 decreases as the storage battery 24 is used. Therefore, in order to accurately grasp the capacity of the storage battery 24, capacity measurement processing is performed.

FIG. 3 shows an overview of capacity measurement processing by the control unit 50 . The horizontal axis indicates time, and the vertical axis indicates the amount of electric power charged in the storage battery 24 . The control unit 50 first executes the first step in the capacitance measurement process. In the first step, the control unit 50 discharges the storage battery 24 to control the charge/discharge circuit 22 so that the remaining amount of the storage battery 24 becomes substantially zero. The charging/discharging circuit 22 discharges the storage battery 24 according to an instruction from the control unit 50 . At that time, the power discharged from the storage battery 24 is consumed in the load device 14 . The control unit 50 confirms the voltage information received from the monitoring unit 52, and ends the first step when the voltage is lower than the voltage threshold at which it is determined that the capacitance measurement should be started.

After completing the first step, the controller 50 executes the second step. In the second step, the control unit 50 controls the charging/discharging circuit 22 so as to charge the storage battery 24 whose remaining amount is substantially zero to full charge. The charging/discharging circuit 22 charges the storage battery 24 according to an instruction from the control unit 50 . The control unit 50 checks the voltage information received from the monitoring unit 52, and ends the second step when the voltage indicates a value corresponding to full charge.

During the second step, the control unit 50 causes the monitoring unit 52 to measure the integrated amount of current input to the storage battery 24 . After completing the second step, the control unit 50 receives the integrated current amount information from the monitoring unit 52 . Specifically, when starting the second step, the control unit 50 instructs the monitoring unit 52 to start measuring the integrated current amount, and when ending the second step, instructs the monitoring unit 52 to stop measuring the integrated current amount. A monitoring unit 52 is used. The monitoring unit 52 measures the integrated current amount from when the measurement start instruction is given until when the measurement end instruction is given. As a result, the control unit 50 acquires the accumulated current amount as the capacity of the storage battery 24 . Return to FIG. The control unit 50 may output information regarding the capacity of the storage battery 24 to the outside of the control system 30 .

The acquisition unit 54 has a communication function and is connected to the server 42 via the network 40 in FIG. The acquisition unit 54 receives weather information from the server 42 . In particular, it can be said that the acquiring unit 54 acquires the issuance of a weather warning when the state in which the weather information does not indicate a weather warning changes to the state in which the weather information indicates a weather warning. Acquisition unit 54 outputs the weather information to control unit 50 .

When the control unit 50 acquires the weather information from the acquisition unit 54 and acquires the issuance of a weather warning, the control unit 50 stops the capacity measurement process. For example, if the control unit 50 acquires the issuance of a weather warning before starting the capacity measurement process, the control unit 50 does not start the capacity measurement process even when the start time of the capacity measurement process arrives. This corresponds to canceling the start of the capacity measurement process.

Further, if the acquiring unit 54 acquires a weather warning during execution of the capacity measurement process, particularly during execution of the first step of the capacity measurement process, the control unit 50 stops execution of the capacity measurement process. That is, the control unit 50 controls the charging/discharging circuit 22 to stop discharging the storage battery 24 . Subsequently, the control unit 50 may control the charging/discharging circuit 22 to charge the storage battery 24 . If the acquisition unit 54 acquires the issuance of a weather warning during execution of the second step of the capacity measurement process, the control unit 50 continues execution of the capacity measurement process. That is, the control unit 50 continues to control the charging/discharging circuit 22 so as to charge the storage battery 24 .

When the state in which the weather information received by the acquisition unit 54 indicates a weather warning changes to the state in which the weather information does not indicate a weather warning, the acquisition unit 54 can be said to acquire cancellation of the weather warning. If the control unit 50 acquires cancellation of the weather warning after canceling the capacity measurement process, the control unit 50 newly executes the capacity measurement process after a certain period of time has elapsed. That is, even if the start of the capacity measurement process is canceled or the execution of the first step of the capacity measurement process is canceled, the control unit 50 newly executes the first step of the capacity measurement process. do.

The subject of an apparatus, system, or method in this disclosure comprises a computer. The main functions of the device, system, or method of the present disclosure are realized by the computer executing the program. A computer has a processor that operates according to a program as its main hardware configuration. Any type of processor can be used as long as it can implement functions by executing a program. The processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or LSI (Large Scale Integration). A plurality of electronic circuits may be integrated on one chip or may be provided on a plurality of chips. A plurality of chips may be integrated into one device, or may be provided in a plurality of devices. The program is recorded in a non-temporary recording medium such as a computer-readable ROM, optical disk, hard disk drive, or the like. The program may be pre-stored in a recording medium, or may be supplied to the recording medium via a wide area network including the Internet.

The operation of the power distribution system 100 configured as above will be described. FIG. 4 is a flow chart showing the procedure of capacity measurement processing by the control system 30. As shown in FIG. The acquiring unit 54 acquires the issuance of a weather warning (S10). If it is before the start of the capacity measurement process (Y of S12), the control unit 50 cancels the start of the capacity measurement process (S14). If the first step is being executed (Y of S16) and not before the start of the capacity measurement process (N of S12), the controller 50 stops the capacity measurement process (S18). If the first step is not being executed (N of S16), the controller 50 continues the capacity measurement process (S20).

According to this embodiment, when a weather warning is issued, the capacity measurement process is stopped. Therefore, the storage battery capacity measurement process can be stopped when the possibility of a power failure is high. Also, if a weather warning is issued before the start of the volume measurement process, the start of the volume measurement process is canceled, so execution of the volume measurement process can be avoided. Further, when the acquisition unit 54 acquires the issuance of a weather warning during execution of the capacity measurement process, execution of the capacity measurement process is stopped, so continuation of the capacity measurement process can be avoided. In addition, the capacity measurement process includes a first step of discharging the storage battery 24 to set the remaining amount of the storage battery 24 to substantially zero, and a second step of charging the storage battery 24 with a substantially zero remaining amount to full charge. step, the capacitance measurement accuracy can be improved. Further, when a weather warning is issued during the execution of the first step of the capacity measurement process, execution of the capacity measurement process is stopped, so discharge of the storage battery 24 can be stopped. Further, when a weather warning is issued during execution of the second step of the capacity measurement process, execution of the capacity measurement process is continued, so charging of the storage battery 24 can be continued. In addition, when the cancellation of the weather warning is obtained after stopping the capacity measurement process, the capacity can be obtained because the capacity measurement process is newly executed after a certain period of time has elapsed.

A summary of one aspect of the present disclosure is as follows. A control system 30 according to an aspect of the present disclosure is a control system 30 that controls a power storage system 20 that includes a storage battery 24 and a charging/discharging circuit 22 that charges/discharges the storage battery 24. By operating the charging/discharging circuit 22, , a control unit 50 for executing capacity measurement processing for measuring the capacity of the storage battery 24, and an acquisition unit 54 for acquiring a weather warning issuance. When the acquisition unit 54 acquires the issuance of the weather warning, the control unit 50 stops the capacity measurement process.

If the acquisition unit 54 acquires the issuance of a weather warning before starting the capacity measurement process, the control unit 50 stops starting the capacity measurement process.

If the acquiring unit 54 acquires the issuance of a weather warning during execution of the capacity measurement process, the control unit 50 stops executing the capacity measurement process.

The capacity measurement process in the control unit 50 includes a first step of discharging the storage battery 24 to make the remaining amount of the storage battery 24 substantially zero, and charging the storage battery 24 with a remaining amount of substantially zero to full charge. and a second step.

If the acquisition unit 54 acquires the issuance of a weather warning during the execution of the first step of the capacity measurement process, the control unit 50 stops the execution of the capacity measurement process, and during the execution of the second step of the capacity measurement process , when the acquisition unit 54 acquires the issuance of a weather warning, the execution of the capacity measurement process is continued.

If the acquisition unit 54 acquires cancellation of the weather warning after stopping the capacity measurement process, the control unit 50 newly executes the capacity measurement process after a certain period of time has elapsed.

The present disclosure has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications are possible in the combination of each component or each treatment process, and such modifications are within the scope of the present disclosure. .

In the capacity measurement process in this embodiment, the second step is executed after the first step is executed. However, not limited to this, for example, in the capacitance measurement process, the first step may be executed after the second step is executed. According to this modified example, the degree of freedom in configuration can be improved.

A power distribution system 100 in this embodiment includes a power storage system 20 . However, for example, the power distribution system 100 may include a renewable energy power generation device such as a solar battery in addition to the power storage system 20 . According to this modification, the storage battery 24 can be charged with the electric power generated by the solar cell. Also, the power generated by the solar cell can be output to the distribution board 12 .

10 power system 12 distribution board 14 load device 20 power storage system 22 charge/discharge circuit 24 storage battery 30 control system 40 network 42 server 50 control unit 52 monitoring unit 54 acquisition unit 100 power distribution system .

Claims (3)

A control system for controlling a power storage system comprising a storage battery and a charge/discharge circuit for charging and discharging the storage battery,
a control unit that performs a capacity measurement process for measuring the capacity of the storage battery by operating the charging/discharging circuit;
an acquisition unit that acquires the issuance of a weather warning,
The capacity measurement process in the control unit includes a first step of discharging the storage battery to set the remaining amount of the storage battery to substantially zero, and charging the storage battery with the remaining amount of substantially zero to full charge. a second step of causing
When the acquisition unit acquires the issuance of a weather warning during execution of the first step of the capacity measurement process, the control unit stops the discharge of the storage battery by stopping the execution of the capacity measurement process. control the charging/discharging circuit immediately, and if the acquiring unit acquires the issuance of a weather warning during execution of the second step of the capacity measurement process, continue the execution of the capacity measurement process to charge the storage battery. continue to control the charge and discharge circuit,
control system. After stopping the capacity measurement process, if the acquisition unit acquires cancellation of the weather warning, the control unit newly executes the capacity measurement process after a certain period of time has elapsed.
A control system according to claim 1 . A program that is executed in a control system that controls a power storage system that includes a storage battery and a charge/discharge circuit that charges and discharges the storage battery,
a step of performing a capacity measurement process for measuring the capacity of the storage battery by operating the charge/discharge circuit;
obtaining a weather warning announcement;
The capacity measurement process includes a first step of discharging the storage battery to make the remaining amount of the storage battery substantially zero, and a second step of charging the storage battery with the remaining amount of substantially zero to full charge. and
In the step of executing the capacity measurement process, if a weather warning is issued during execution of the first step of the capacity measurement process, the discharge of the storage battery is stopped by stopping the execution of the capacity measurement process. control the charge/discharge circuit, and if a weather warning is issued during execution of the second step of the capacity measurement process, the charge/discharge circuit continues to execute the capacity measurement process to charge the storage battery A program that causes a computer to keep control of

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