JP2022021372A - Storage battery control device, storage battery system, and program - Google Patents

Abstract

To provide a storage battery control device capable of suppressing deviation of a storage battery that operates while suppressing power loss.SOLUTION: A storage battery control device 1 controlling PCS3-1 to 3-n charging/discharging respective storage batteries 2-1 to 2-n includes: a charge/discharge command value determination part 11 determining charge/discharge command value of a total of the storage batteries 2-1 to 2-n; a storage battery determination part 13 determining every first cycle an operation device to be PCS3-1 to 3-n to operate so that a proportion of the PCS3-1 to 3-n to operate and rated value of the PCS3-1 to 3-n of the command value distributed to the respective PCS3-1 to 3-n to operate becomes value equal to first value or larger; and a command value distribution part 15 distributing to the operation device the charge/discharge command value. The storage battery determination part 13 determines the operation device so as to rotate the operation device every first cycle.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a storage battery control device that controls a plurality of storage batteries, a storage battery system including the storage battery control device, and a program executed by the storage battery control device.

A storage battery system equipped with a storage battery is used for various purposes such as temporarily storing the electric power generated by a power generation device using natural energy and adjusting the balance between supply and demand. Some storage battery systems realize a large capacity by using a plurality of storage batteries. The plurality of storage batteries are charged and discharged by a power conversion device such as a PCS (Power Conditioning System) corresponding to each.

In a storage battery system equipped with a plurality of storage batteries, the charge / discharge command value is generally distributed to all the storage batteries. Therefore, when the charge / discharge command value of the entire storage battery system is extremely smaller than the rated value of the entire storage battery system, one storage battery is used. The ratio of the charge / discharge command value to the rated value of the storage battery is also extremely small. The power conversion efficiency in the power conversion device depends on the ratio of the actual output to the rated value, and if the ratio is smaller than a certain level, the power conversion efficiency deteriorates and power loss occurs.

Patent Document 1 discloses a technique for increasing the command value per storage battery by determining the number of storage batteries to be operated so as to have the highest power conversion efficiency, and preventing a decrease in the power conversion efficiency.

Japanese Unexamined Patent Publication No. 2013-172567

However, in the technique described in Patent Document 1, after the number of storage batteries to be operated is determined, the storage batteries to be operated are determined based on the charge rate of the storage batteries. Therefore, when discharging is performed after charging, the storage battery having a low charge rate operates first in charging, and the charging rate of the storage battery increases, whereby the storage battery operates in the subsequent discharging. As such, there is a possibility that the operating storage battery will be biased toward a specific storage battery. If the operating storage battery is biased toward a specific storage battery, the deterioration of the specific storage battery and the PCS will progress. In order to equalize the degree of deterioration of a plurality of storage batteries and the PCS that controls these storage batteries, it is desirable to equalize the frequency of use of the storage batteries and the storage battery control device by suppressing the bias of the operating storage batteries.

The present disclosure has been made in view of the above, and an object of the present invention is to obtain a storage battery control device capable of suppressing bias of an operating storage battery while suppressing power loss.

In order to solve the above-mentioned problems and achieve the object, the storage battery control device according to the present disclosure is a storage battery control device that controls a plurality of power conversion devices that charge and discharge each of a plurality of storage batteries. It is provided with a charge / discharge command value determining unit for determining the total charge / discharge command value of the storage batteries. In this storage battery control device, the ratio of the command value distributed to each of the power conversion devices to be operated based on the charge / discharge command value and the rated value of the power conversion device to the rated value of the power conversion device is first. It is provided with a storage battery determination unit that determines an operating device that is a power conversion device to be operated so as to be equal to or higher than the value, and a command value distribution unit that distributes charge / discharge command values to the operating device. The storage battery determination unit determines the operating device so as to rotate the operating device every first cycle.

According to the present disclosure, it is possible to suppress the bias of the operating storage battery while suppressing the power loss.

The figure which shows the structural example of the storage battery system of embodiment A diagram showing an example of the correspondence between the charge / discharge command value and the storage battery to be operated. The figure which shows typically the relationship between the charge / discharge command value and the 1st period. A flowchart showing an example of a storage battery control procedure in the storage battery control device of the embodiment. The figure which shows the configuration example of the processing circuit when the processing circuit is a circuit including a processor.

Hereinafter, the storage battery control device, the storage battery system, and the program according to the embodiment will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of a storage battery system according to an embodiment of the present disclosure. The storage battery system of the present embodiment is a PCS (Power Conditioning System) 3-1 to charge / discharge the storage battery control device 1, the storage batteries 2-1 to 2-n, and the storage batteries 2-1 to 2-n, respectively. It is provided with 3-n. n is an integer of 2 or more. Note that FIG. 1 also shows a management device 4 capable of making various settings for the storage battery system.

The storage battery system of the present embodiment can be used, for example, for temporarily storing the electric power generated by a power generation device using natural energy or adjusting the supply-demand balance. The use of the storage battery system is not limited to this.

The storage batteries 2-1 to 2-n are a plurality of storage batteries capable of storing electric power. The PCS3-1 to 3-n charge and discharge the storage batteries 2-1 to 2-n based on the control command received from the storage battery control device 1. The PCS3-1 to 3-n may be connected to, for example, the power system of the electric power company or may be connected to the independent system.

When each of the storage batteries 2-1 to 2-n is shown without distinction, it is described as storage battery 2, and when each of PCS3-1 to 3-n is shown without distinction, it is described as PCS3. The PCS3 is a power conversion device that converts DC power and AC power in both directions.

The storage battery control device 1 includes a charge / discharge command value determination unit 11, a data storage unit 12, a storage battery determination unit 13, an evaluation function setting unit 14, a command value distribution unit 15, a command unit 16, and a storage battery state acquisition unit 17.

The charge / discharge command value determination unit 11 determines the charge / discharge command value, which is the total charge / discharge command value of the storage batteries 2-1 to 2-n, that is, the total value of the command values commanded to PCS3-1 to 3-n. .. The charge / discharge command value determination unit 11 stores the determined charge / discharge command value in the data storage unit 12 and outputs the determined charge / discharge command value to the command value distribution unit 15. The method for determining the charge / discharge command value in the charge / discharge command value determination unit 11 may be appropriately determined according to the application of the storage battery system, and the method for determining the charge / discharge command value is not particularly limited. For example, when selling power by causing the power generated by a power generation device using natural energy to flow backward to the power system of a power company, the generated power is temporarily stored by the storage battery system of the present embodiment. When the fluctuation of the electric power at the interconnection point is suppressed by this, the charge / discharge command value determining unit 11 determines the charge / discharge amount based on the power generation amount of the power generation device and the allowable value of the fluctuation at the interconnection point. You may. Further, when the storage battery system of the present embodiment is installed in a power plant and used for suppressing fluctuations in system frequency, the charge / discharge command value determination unit 11 determines the charge / discharge command values according to the fluctuations in system frequency. May be determined. Further, when the storage battery system of the present embodiment is used in an independent system to adjust the balance between the amount of power generated by the power generation device in the independent system and the amount of demand in the independent system, the charge / discharge command value determination unit 11 May determine the charge / discharge command value according to the amount of power generation and the amount of demand. As described above, the use of the storage battery system of the present embodiment is not limited to these, and the charge / discharge command value determining unit 11 determines the charge / discharge command value according to the request to the storage battery system according to the use.

The data storage unit 12 stores the charge / discharge command value determined by the charge / discharge command value determination unit 11. Based on the charge / discharge command value stored in the data storage unit 12 and the rated value of the PCS3, the storage battery determination unit 13 has a first ratio of the command value to be distributed to each of the PCS3s to be operated with respect to the rated value of the PCS3. The operating device which is the PCS3 to be operated is determined every first cycle so as to be equal to or more than the value of. The storage battery determination unit 13 determines the operating device so as to rotate the operating device every first cycle. The details of the operation of the storage battery determination unit 13 will be described later.

The storage battery state acquisition unit 17 acquires information on the state of the storage battery 2 such as the charge rate (SOC: State Of Charge) of the storage battery 2 via the PCS3.

The evaluation function setting unit 14 accepts the setting of the evaluation function for distributing the charge / discharge command value, which is the total command value of PCS3-1 to 3-n, to each PCS3, and sets the evaluation function in the command value distribution unit 15. do. The command value distribution unit 15 operates each storage battery 2 which is a total command value based on the number of storage batteries 2 determined by the storage battery determination unit 13 and the evaluation function received from the management device 4. That is, it is distributed to the PCS3 to be operated, and the distributed command value is passed to the command unit 16. The command unit 16 transmits the distributed command value to each PCS3 to which the charge / discharge command is transmitted as a control command value. The evaluation function is, for example, a function in which the value of the evaluation function becomes smaller as the SOC of each PCS3 becomes equal when charging / discharging is performed with the distributed command value using the SOC of each PCS3 received from each PCS3. The command value distribution unit 15 distributes the command value to each PCS 3 so that the evaluation function is minimized. The evaluation function is not limited to this. Further, the command value distribution unit 15 may evenly distribute the charge / discharge command values to each PCS3 without using the evaluation function, and if the rated capacities of the storage batteries 2 corresponding to the PCS3 are different, the rated capacities The command value may be distributed to each PCS3 according to the ratio of.

The management device 4 is a computer used for monitoring and control, and has, for example, an input means for receiving input from an operator of a storage battery system and a display means for displaying a screen for monitoring. The management device 4 receives the input of the evaluation function to be set in the storage battery control device 1 from the operator, and transmits the evaluation function to the storage battery control device 1. The management device 4 may receive a rule from the operator for the storage battery determination unit 13 to determine the number of storage batteries 2 to be operated, that is, the number of PCS3s to be operated, and transmit the rule to the storage battery control device 1. .. This makes it possible for the storage battery determination unit 13 to change the rules for determining the number of storage batteries 2 to be operated. If the evaluation function is not used and, for example, the command value distribution unit 15 evenly distributes the charge / discharge command values to each PCS 3, the management device 4 and the evaluation function setting unit 14 may not be provided. ..

Next, the operation of the storage battery control device 1 of the present embodiment will be described. In general, the power conversion efficiency in a power conversion device such as PCS3 depends on the ratio of the actual output to the rated value. Therefore, when the command value commanded to one storage battery 2, that is, one PCS3 is small, the power loss may be large. Generally, for example, when this ratio is less than 30%, the power loss increases by about several percent as compared with the case where the ratio is 30% or more. Since 30% is an example and depends on the method of the power conversion device, the lower limit of the ratio for suppressing the increase in power loss is not limited to the above example.

Therefore, in the present embodiment, the storage battery determination unit 13 of the storage battery control device 1 operates the storage battery 2, that is, operates so as to suppress the power loss based on the rated value and the charge / discharge command value of each PCS3. Determine the number of PCS3s. For example, the storage battery determination unit 13 determines the number of PCS3s to be operated so that the ratio of the command value corresponding to each PCS3 to the rated value is equal to or greater than the first value. Further, the storage battery determination unit 13 rotates the operating PCS3 so that the operating PCS3 is not biased.

FIG. 2 is a diagram showing an example of correspondence between the charge / discharge command value and the storage battery 2 to be operated. In the example shown in FIG. 2, the case where the number n of the storage batteries 2 is 8 is shown, and in FIG. 2, the storage batteries 2-1 to 2-8 are shown as BT # 1 to BT # 8, respectively. The value of 2MW described under BT # 1 to BT # 8 indicates the rated value of each storage battery 2, that is, the PCS3 corresponding to each storage battery 2. When the charge / discharge command value is a positive value, it indicates the charging power, and when it is a negative value, it indicates the discharging power.

In the example shown in FIG. 2, the storage battery 2 to be operated is determined with 1 minute as one cycle, and the storage battery determination unit 13 determines that the storage battery 2 to be operated is one at the start of the operation, and operates the storage battery 2. 2 is determined to be the storage battery 2-1. In the example shown in FIG. 2, the first cycle, which is the cycle for determining the storage battery 2 to be operated, is set to 1 minute, but the first cycle is not limited to 1 minute. In the example shown in FIG. 2, the storage battery 2-1 is used from the start to 1 minute later. That is, from the start to 1 minute later, the charge / discharge command is transmitted from the storage battery control device 1 to one of the PCS3-1 units. One minute after the start of operation, the storage battery determination unit 13 determines that the storage batteries 2 to be operated are two, and the storage batteries 2 to be operated are the storage batteries 2-2, 2-3. From 1 minute to 2 minutes after the start of operation, the storage batteries 2-2, 2-3 are used. That is, from 1 minute to 2 minutes after the start of the operation, the charge / discharge command is transmitted from the storage battery control device 1 to the two PCS3-2,3-3. Hereinafter, similarly, the storage battery determination unit 13 determines the storage battery 2 to be operated in a 1-minute cycle.

In the example shown in FIG. 2, # 1 to # 8 such as BT # 1 to BT # 8 are the numbers of the storage batteries 2, and when a plurality of storage batteries 2 are used in each first cycle, the numbers are consecutive. The rule is that the storage battery 2 is used. The number of the storage battery 2 is the same as the number of the corresponding PCS3. Further, the storage battery 2 having the youngest number used in each first cycle is increased by one in order of # 1, # 2, # 3, ... For each first cycle, so that the storage battery used is used. 2 is rotated. It should be noted that the number is cyclically rotated so that the number next to the highest number is the lowest number. As described above, in the example shown in FIG. 2, consecutive numbers are assigned to each of the plurality of PCS3s, and the storage battery determination unit 13 determines the PCS3s having consecutive numbers as the operating device, and operates every first cycle. The youngest number among the device numbers is incremented by one.

Generally, the second cycle, which is the cycle for determining the charge / discharge command value, is shorter than the first cycle. For example, the charge / discharge command value is determined in a cycle of 0.1 seconds. Further, the command value distribution unit 15 distributes the charge / discharge command value to the operating device in the second cycle. The charging / discharging command value determination cycle is not limited to this example. Therefore, the charge / discharge command value changes within each first cycle.

FIG. 3 is a diagram schematically showing the relationship between the charge / discharge command value and the first period. In FIG. 3, the horizontal axis indicates the elapsed time, and the vertical axis indicates the charge / discharge command value. In FIG. 3, the first period is described as _Trot . Note that FIG. 3 is a schematic diagram, and the number of charge / discharge command values in the first cycle is not limited to the example of FIG. As shown in FIG. 3, the charge / discharge command value changes within the first cycle. The command value distribution unit 15 distributes the charge / discharge command value to the operating storage battery 2 each time the charge / discharge command value is determined. Therefore, when determining the number of operating storage batteries 2, it is desirable to determine with a margin for the rated value of each storage battery 2. For example, if the charge / discharge command value is 4 MW and the rated value of each PCS 3 is 2 MW, if the storage battery determination unit 13 determines that the number of storage batteries 2 to be operated is two, the charge / discharge command value. However, if it exceeds 4 MW after that, the command value to be distributed to each PCS3 will exceed the rated value.

Therefore, the storage battery determination unit 13 determines the number of storage batteries 2 to be operated so that the command value is distributed to each PCS 3 in the range of, for example, A% or more and less than B% of the rated value. That is, the storage battery determination unit 13 determines the operating device so that the ratio of the command value to be distributed to the operating device to the rated value of the power conversion device is less than 1 and equal to or less than the second value. Note that A% is the lower limit of the ratio for suppressing the increase in power loss described above, and B is a value larger than A and less than 100. B may be appropriately determined according to the expected value of fluctuation in the first period. Further, the method of securing the margin is not limited to this example, and the storage battery determination unit 13 determines, for example, an operating device so that the command value of each PCS3 is equal to or less than a value obtained by subtracting a certain value from the rated value. May be good. The method for securing the margin is not limited to the above-mentioned example, and any method for securing the margin may be used. That is, the storage battery determination unit 13 may determine the operating device so that the command value to be distributed to the operating device is smaller than the rated value of the PCS3.

In the case of discharging, the charge / discharge command value becomes a negative value, so the storage battery 2 to be operated, that is, the PCS 3 to be operated is determined based on the absolute value of the charge / discharge command value, as in the case of charging. ..

Further, the storage battery determination unit 13 uses, for example, the average value of the previous first cycle when determining the number of storage batteries 2 to be operated. If the first cycle is 1 minute, the average value of the charge / discharge command values for 1 minute is used. As a result, the influence of short-term fluctuations in the charge / discharge command value can be suppressed, and the number of storage batteries 2 to be operated can be appropriately set. The charge / discharge command value used when determining the number of storage batteries 2 to be operated is not limited to the average value of the charge / discharge command values of the previous first cycle, and the charge / discharge of the previous first cycle is not limited to the average value. It may be the median value of the command value. Further, when the average value of the charge / discharge command values is used, the average value is not limited to the above example, and may be calculated by using a plurality of charge / discharge command values. The method of smoothing the charge / discharge command value when determining the number of storage batteries 2 to be operated is not limited to these examples.

FIG. 4 is a flowchart showing an example of the storage battery control procedure in the storage battery control device 1 of the present embodiment. The storage battery determination unit 13 determines whether or not it is the determination timing of the PCS3 to be operated (step S1). As described above, since the PCS3 to be operated in the first cycle is determined, specifically, in step S1, for example, the storage battery determination unit 13 determines the PCS3 to be operated in the first cycle last time. Determine if has passed.

If it is not the determination timing of the PCS3 to be operated (step S1 No), the storage battery determination unit 13 repeats step S1. When it is the determination timing of the PCS3 to be operated (step S1 Yes), the storage battery determination unit 13 calculates the average value of the charge / discharge command values (step S2). Specifically, the storage battery determination unit 13 reads, for example, the charge / discharge command value of the previous first cycle from the data storage unit 12, and calculates the average value of the read charge / discharge command values. As described above, instead of the average value of the charge / discharge command value, a value smoothed by another process such as the median value of the charge / discharge command value for 1 minute may be used.

Next, the storage battery determination unit 13 determines the number of PCS3s to be operated based on the average value (step S3). The storage battery determination unit 13 notifies the command value distribution unit 15 of the PCS3 to be operated. Specifically, in step S3, when the charge / discharge command value is equal to or less than a predetermined small value that can be regarded as 0 or 0, the storage battery determination unit 13 determines that the number of PCS3s to be operated is 0. do. When the number of PCS3s to be operated is not 0, the storage battery determination unit 13 determines the number of PCS3s to be operated, for example, by the following procedure. The rated value of PCS3 of No. _i is Pi, and the average value of charge / discharge command values is _PT . When the method of securing the margin is a method of A% or more and less than B% of the rated value, the minimum k satisfying the following equation (1) is determined to be the number of PCS3s. However, when the _PT is smaller than (A / 100) × Pi, the storage battery determination unit 13 determines the number of _PCS3s to be operated to one.
P _min = (A / 100) × (P _i + P _{i + 1} + ... + P _{i + k-1} )
P _max = (B / 100) × (P _i + P _{i + 1} + ... + P _{i + k-1} )
P _T ≤ P _max and P _T ≥ P _min ... (1)

As described above, the number i is incremented by 1 in each first cycle. The above-mentioned method for determining the PCS3 to be operated is an example, and may be determined according to a method for securing a margin, a rotation rule, and the like, and the method for determining the PCS3 to be operated is not limited to the above-mentioned example. For example, the number i may be increased by 2 for each first cycle to change the number of numbers to be increased for each first cycle, or even numbers such as 2, 4, and 6 in a certain first cycle. The rotation rule may be such that the storage batteries 2 having consecutive numbers are used, and the storage batteries 2 having consecutive numbers among odd-numbered batteries are used in the next first cycle.

Next, the command value distribution unit 15 distributes the charge / discharge command value to the PCS 3 to be operated (step S4). At this time, the command value distribution unit 15 receives the latest charge / discharge command value from the charge / discharge command value determination unit 11, and for example, the charge / discharge command value is applied to each PCS 3 based on the evaluation function set by the evaluation function setting unit 14. To allocate. This evaluation function may be, for example, a function indicating the variation in SOC of each PCS3 after charging / discharging with the distributed command value, or may be another function. The evaluation function may be a weighted addition value of the amount of deviation from the average value of the SOC of each PCS3 after charging / discharging with the distributed command value. Further, the command value distribution unit 15 may distribute the command value evenly to each PCS3 without using the evaluation function. The method of allocating the command value is not limited to the above-mentioned example, and any method may be used. The command value distribution unit 15 outputs the distributed command value to the command unit 16.

The command unit 16 transmits the distributed command values to each PCS 3 (step S5). After step S5, the command value distribution unit 15 determines whether or not the charge / discharge command value has been updated (step S6), and when the charge / discharge command value is updated, that is, charge / discharge from the charge / discharge command value determination unit 11. When a new command value is received (step S6 Yes), the process from step S4 is repeated. If the charge / discharge command value has not been updated (step S6 No), the command value distribution unit 15 repeats step S6. FIG. 4 is an example, as long as it is a process that can obtain the same result, the specific content of the process and the order of the processes can be changed as appropriate.

Here, the hardware configuration of the storage battery control device 1 will be described. The charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery state acquisition unit 17 of the storage battery control device 1 are realized by a processing circuit. The data storage unit 12 is realized by a memory.

The processing circuit that realizes the charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery state acquisition unit 17 of the storage battery control device 1 is a circuit including a processor. It may be, or it may be dedicated hardware. The processing circuit is also called a control circuit.

When the processing circuit that realizes the charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery state acquisition unit 17 is dedicated hardware, the processing circuit. Is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.

FIG. 5 is a diagram showing a configuration example of a processing circuit when the processing circuit is a circuit including a processor. When the processing circuit that realizes the charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery state acquisition unit 17 includes a processor, the processing circuit is, for example, the figure. As shown in 5, the processor 101 and the memory 102 are provided. When the processing circuit is the processing circuit shown in FIG. 5, each function of the charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery status acquisition unit 17 Is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 102. In the processing circuit, each function is realized by the processor 101 reading and executing the program stored in the memory 102. This program may be provided by a recording medium on which the program is recorded, or may be provided by other means such as a communication medium. The memory 102 is also used as a storage area for storing data necessary for the processor 101 to execute processing.

Here, the processor 101 is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. Further, the memory 102 may be non-volatile or volatile, for example, RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), or the like. This includes semiconductor memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), and the like.

Further, a communication circuit including a receiver and a transmitter may be used to realize the storage battery determination unit 13, the evaluation function setting unit 14, the command unit 16, and the storage battery state acquisition unit 17. Further, the memory that realizes the data storage unit 12 may be a part of the memory 102 shown in FIG. 5, or may be provided separately from the memory 102 shown in FIG.

Each function of the charge / discharge command value determination unit 11, the storage battery determination unit 13, the evaluation function setting unit 14, the command value distribution unit 15, the command unit 16, and the storage battery status acquisition unit 17 is partially realized by dedicated hardware. Some may be realized by software or firmware.

As described above, in the present embodiment, the storage battery control device 1 operates the number of storage batteries 2 so that the PCS3 operates at an output that suppresses the power loss based on the charge / discharge command value, that is, the PCS3 to be operated. I tried to decide the number of. As a result, power loss can be suppressed. Further, the storage battery control device 1 is designed to rotate the operating PCS3. Therefore, it is possible to suppress the bias of the operating storage battery 2. Therefore, since the frequency of use of the PCS 3 and the storage battery 2 can be kept constant, the deterioration of the PCS 3 and the storage battery 2 can be made uniform. Further, in the present embodiment, the storage battery 2 to be operated is determined in a cycle longer than the determination cycle of the charge / discharge command value, and a margin is provided with respect to the rated value when determining the number of PCS 3 to be operated. Therefore, even if the charge / discharge command value fluctuates, the command value can be distributed to each PCS3 within the range of the rated value of each PCS3. If the ratio of the output of PCS3 to the rated value is more than a certain level, there is no big difference in the conversion efficiency of PCS3. Therefore, if the storage battery 2 to be operated with a margin secured within the range where the power conversion efficiency does not decrease is determined, the power conversion efficiency The decrease can be suppressed. Further, since the rotation rule is set in advance and the storage battery 2 is rotated in a cycle longer than the charge / discharge command value determination cycle, the storage battery 2 can be determined by a simple process and the frequency of determining the PCS 3 to be operated. Since it is possible to suppress the processing load, the processing load can be suppressed.

The configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.

1 Storage battery control device, 2-1 to 2-n storage battery, 3-1 to 3-n PCS, 4 management device, 11 Charge / discharge command value determination unit, 12 Data storage unit, 13 Storage battery determination unit, 14 Evaluation function setting unit , 15 Command value distribution unit, 16 Command unit, 17 Storage battery status acquisition unit.

Claims (8)

It is a storage battery control device that controls a plurality of power conversion devices that charge and discharge each of a plurality of storage batteries.
A charge / discharge command value determination unit that determines the total charge / discharge command value of the plurality of storage batteries, and a charge / discharge command value determination unit.
Based on the charge / discharge command value and the rated value of the power conversion device, the ratio of the command value distributed to each of the power conversion devices to be operated to the rated value of the power conversion device is equal to or higher than the first value. In addition, a storage battery determination unit that determines the operating device, which is the power conversion device to be operated, in each first cycle,
A command value distribution unit that distributes the charge / discharge command value to the operating device,
Equipped with
The storage battery control device is characterized in that the storage battery determination unit determines the operating device so as to rotate the operating device every first cycle. The charge / discharge command value determination unit determines the charge / discharge command value in a second cycle shorter than the first cycle.
The command value distribution unit distributes the charge / discharge command value to the operating device in the second cycle.
The storage battery control device according to claim 1, wherein the storage battery determination unit determines the operating device so that the command value distributed to the operating device is smaller than the rated value of the power conversion device. The storage battery control device according to claim 2, wherein the storage battery determination unit determines the operating device based on an average value calculated by using the plurality of charge / discharge command values. The storage battery determination unit determines the operating device so that the ratio of the command value to be distributed to the operating device to the rated value of the power conversion device is not less than a second value of less than 1. Item 3. The storage battery control device according to Item 3. 3. 4. The storage battery control device according to 4. Each of the multiple power converters is given a contiguous number and
The storage battery determination unit determines the power conversion device having consecutive numbers as the operating device, and increases the youngest number among the numbers of the operating device by one in each first cycle. The storage battery control device according to any one of claims 1 to 5. With multiple storage batteries,
A plurality of power conversion devices capable of charging and discharging each of the plurality of storage batteries and connecting to the power system, and
The storage battery control device according to any one of claims 1 to 6, which controls the plurality of power conversion devices.
A storage battery system characterized by being equipped with. For a storage battery control device that controls multiple power conversion devices that charge and discharge each of a plurality of storage batteries.
A charge / discharge command value determination step for determining the total charge / discharge command value of the plurality of storage batteries, and a charge / discharge command value determination step.
Based on the charge / discharge command value and the rated value of the power conversion device, the ratio of the command value distributed to each of the power conversion devices to be operated to the rated value of the power conversion device is equal to or higher than the first value. In addition, a storage battery determination step for determining an operating device, which is the power conversion device to be operated, in each first cycle,
A command value distribution step for distributing the charge / discharge command value to the operating device, and
To execute,
In the storage battery determination step, the program is characterized in that the operating device is determined so as to rotate the operating device in each first cycle.

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