JP7349965B2 - Storage battery control device, storage battery system and program - Google Patents

Description

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

A storage battery system including a storage battery is used for various purposes such as temporarily storing electric power generated by a power generation device using natural energy and adjusting the supply-demand balance. Some storage battery systems achieve large capacity by using multiple storage batteries. The plurality of storage batteries are charged and discharged by respective power conversion devices such as PCS (Power Conditioning System).

In a storage battery system equipped with multiple storage batteries, charge/discharge command values are generally distributed to all the storage batteries, so if the charge/discharge command value for the entire storage battery system is extremely smaller than the rated value for the entire storage battery system, the charge/discharge command value for each storage battery is The ratio of the charge/discharge command value to the rated value of the storage battery also becomes extremely small. The power conversion efficiency in a 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 maximize the power conversion efficiency, thereby preventing a decrease in power conversion efficiency.

Japanese Patent Application Publication No. 2013-172567

However, in the technique described in Patent Document 1, after determining the number of storage batteries to be operated, the storage batteries to be operated are determined based on the charging rate of the storage batteries. Therefore, when discharging is performed after charging, the storage battery with a low charging rate is activated first during charging, and the charging rate of the storage battery increases, and as a result, the storage battery is activated during subsequent discharging. As such, there is a possibility that the number of storage batteries in operation is biased toward a specific storage battery. If the number of operating storage batteries is biased toward a specific storage battery, the specific storage battery and PCS will deteriorate. 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 imbalance in the storage batteries that are in operation.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a storage battery control device that can suppress unevenness in operating storage batteries while suppressing power loss.

In order to solve the above-mentioned problems and achieve the purpose, a 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. a charging/discharging command value determination unit that determines a total charging/discharging command value for the storage batteries. This storage battery control device is further configured such that, based on the charging/discharging command value and the rated value of the power converting device, the ratio of the command value distributed to each of the power converting devices to be operated to the rated value of the power converting device is a first value. The present invention includes a storage battery determining unit that determines an operating device, which is a power conversion device to be operated, in each first period so that the operating device is equal to or greater than the value of the charging/discharging command value. The storage battery determining 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 unevenness in operating storage batteries while suppressing power loss.

A diagram showing a configuration example of a storage battery system according to an embodiment Diagram showing an example of the correspondence between charge/discharge command values and storage batteries to be operated A diagram schematically showing the relationship between the charge/discharge command value and the first cycle Flowchart showing an example of a storage battery control procedure in the storage battery control device of the embodiment A diagram showing an example of the configuration of a processing circuit when the processing circuit is a circuit including a processor.

Below, a storage battery control device, a storage battery system, and a program according to an embodiment will be described in detail based on the drawings.

FIG. 1 is a diagram illustrating a configuration example of a storage battery system according to an embodiment of the present disclosure. The storage battery system of the present embodiment includes a storage battery control device 1, storage batteries 2-1 to 2-n, and PCS (Power Conditioning System) 3-1 to 3-1 for charging and discharging each of the storage batteries 2-1 to 2-n. 3-n. n is an integer of 2 or more. Note that FIG. 1 also illustrates a management device 4 that can perform various settings for the storage battery system.

The storage battery system of this embodiment can be used, for example, to temporarily store electric power generated by a power generation device using natural energy or to adjust the supply-demand balance. The uses of the storage battery system are not limited to this.

The storage batteries 2-1 to 2-n are a plurality of storage batteries that can store electric power. The PCSs 3-1 to 3-n charge and discharge the storage batteries 2-1 to 2-n based on control commands received from the storage battery control device 1. The PCSs 3-1 to 3-n may be connected to, for example, an electric power system of a power company, or may be connected to an independent system.

When each of the storage batteries 2-1 to 2-n is shown without being individually distinguished, it is written as a storage battery 2, and when each of the PCSs 3-1 to 3-n is shown without being individually distinguished, it is written as PCS3. The PCS 3 is a power conversion device that bidirectionally converts DC power and AC power.

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

The charging/discharging command value determination unit 11 determines a charging/discharging command value that is the total charging/discharging command value of the storage batteries 2-1 to 2-n, that is, the total value of command values to be commanded to the PCSs 3-1 to 3-n. . The charging/discharging command value determining section 11 stores the determined charging/discharging command value in the data storage section 12 and outputs it to the command value distribution section 15 . The method for determining the charging/discharging command value in the charging/discharging command value determination unit 11 may be determined as appropriate depending on the use of the storage battery system, and there is no particular restriction on the method for determining the charging/discharging command value. For example, when selling electricity by reversely flowing the electricity generated by a power generation device using natural energy to the power grid of a power company, the generated electricity may be temporarily stored in the storage battery system of this embodiment. In order to suppress fluctuations in power at the interconnection point, the charging/discharging command value determining unit 11 determines the amount of charging and discharging based on the power generation amount of the power generating device and the allowable value of fluctuation at the interconnection point. It's okay. Further, when the storage battery system of the present embodiment is installed in a power plant and used to suppress grid frequency fluctuations, the charging/discharging command value determination unit 11 determines the charging/discharging command value according to the fluctuations in the grid 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 The charging/discharging command value may be determined according to the amount of power generation and the amount of demand. As described above, the application of the storage battery system of this embodiment is not limited to these, and the charging/discharging command value determination unit 11 determines the charging/discharging command value in accordance with the requirements for the storage battery system according to the application.

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 and the rated value of the PCS 3 stored in the data storage unit 12, the storage battery determining unit 13 determines that the ratio of the command value to be distributed to each of the PCSs 3 to be operated to the rated value of the PCS 3 is the first. An operating device, which is the PCS 3 to be operated, is determined for each first period so that the value is greater than or equal to the value of . The storage battery determining unit 13 determines the operating device so as to rotate the operating device every first cycle. Details of the operation of the storage battery determining unit 13 will be described later.

The storage battery state acquisition unit 17 acquires information regarding the state of the storage battery 2, such as the state of charge (SOC) of the storage battery 2, via the PCS 3.

The evaluation function setting unit 14 receives the setting of an evaluation function for distributing the charge/discharge command value, which is the total command value of the PCSs 3-1 to 3-n, to each PCS 3, and sets the evaluation function to the command value distribution unit 15. do. The command value distribution unit 15 assigns a charge/discharge command value, which is a total command value, to each storage battery 2 to be operated 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 PCS 3 to be operated, and the distributed command value is passed to the command unit 16. The command unit 16 transmits the distributed command value as a control command value to each PCS 3 to which the charge/discharge command is transmitted. The evaluation function is, for example, a function such that the value of the evaluation function becomes smaller as the SOC of each PCS3 becomes equal when charging and discharging is performed with the allocated 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 equally distribute the charge/discharge command value to each PCS 3 without using an evaluation function, or if the rated capacity of the storage battery 2 corresponding to the PCS 3 is different, the rated capacity The command value may be distributed to each PCS 3 according to the ratio.

The management device 4 is a computer used for monitoring control, and includes, for example, input means for receiving input from an operator of the storage battery system, and display means for displaying a monitoring screen. The management device 4 receives an input of an evaluation function to be set to the storage battery control device 1 from the operator, and transmits the evaluation function to the storage battery control device 1. In addition, in the management device 4, the storage battery determining unit 13 may receive a rule from the operator for determining the number of storage batteries 2 to be operated, that is, the number of PCSs 3 to be operated, and may transmit the rule to the storage battery control device 1. . This allows the storage battery determining unit 13 to change the rules used to determine the number of storage batteries 2 to be operated. Note that, for example, when the command value distribution unit 15 equally distributes the charge/discharge command value to each PCS 3 without using the evaluation function, 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 this embodiment will be explained. Generally, the power conversion efficiency in a power conversion device like the PCS3 depends on the ratio of the actual output to the rated value. For this reason, when the command value instructed to one storage battery 2, that is, one PCS 3 is small, power loss may become large. Generally, for example, when this ratio is less than 30%, power loss increases by several percent compared to when the ratio is 30% or more. Note that 30% is an example, and the lower limit of the ratio for suppressing an increase in power loss is not limited to the above example, since it also depends on the system of the power converter.

Therefore, in the present embodiment, the storage battery determining unit 13 of the storage battery control device 1 operates the storage battery 2 to be operated, that is, to operate, so as to suppress power loss, based on the rated value and charge/discharge command value of each PCS 3. Determine the number of PCS3. For example, the storage battery determining unit 13 determines the number of PCSs 3 to be operated so that the ratio of the command value corresponding to each PCS 3 to the rated value is greater than or equal to a first value. Furthermore, the storage battery determining unit 13 rotates the PCSs 3 to be operated so that the PCSs 3 to be operated are not biased.

FIG. 2 is a diagram showing an example of the correspondence between charge/discharge command values and storage batteries 2 to be operated. The example shown in FIG. 2 shows a case where the number n of storage batteries 2 is 8, and in FIG. 2, storage batteries 2-1 to 2-8 are shown as BT#1 to BT#8, respectively. The value 2MW written under BT#1 to BT#8 indicates the rated value of each storage battery 2, that is, the PCS 3 corresponding to each storage battery 2. The charge/discharge command value indicates charging power when it is a positive value, and indicates discharging power when it is a negative value.

In the example shown in FIG. 2, the storage battery 2 to be operated is determined with one minute as one cycle, and the storage battery determination unit 13 determines the number of storage batteries 2 to be operated as one at the start of operation, and the storage battery 2 to be operated is determined. 2 is determined to be the storage battery 2-1. In the example shown in FIG. 2, the first period, which is the period for determining the storage battery 2 to be operated, is one minute, but the first period is not limited to one minute. In the example shown in FIG. 2, the storage battery 2-1 is used from the start until one minute later. That is, until one minute after the start, the charge/discharge command is sent from the storage battery control device 1 to only one PCS 3-1. One minute after the start of the operation, the storage battery determining unit 13 determines that there are two storage batteries 2 to be operated, and determines that the storage batteries 2 to be operated are the storage batteries 2-2 and 2-3. The storage batteries 2-2 and 2-3 are used from 1 minute to 2 minutes after the start of operation. That is, from one minute to two minutes after the start of operation, charge/discharge commands are sent from the storage battery control device 1 to the two PCSs 3-2 and 3-3. Thereafter, similarly, the storage battery determining unit 13 determines the storage battery 2 to be operated in one-minute cycles.

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 if a plurality of storage batteries 2 are used within each first cycle, consecutive numbers are used. The rule is that storage battery 2 is used. Note that the number of the storage battery 2 is the same as the number of the corresponding PCS 3. In addition, by sequentially increasing the storage battery 2 with the lowest number used in each first cycle by one as #1, #2, #3, etc. in each first cycle, the number of storage batteries used is 2 is being rotated. Note that the numbers are cyclically rotated so that the next largest number is the smallest number. In this way, in the example shown in FIG. 2, consecutive numbers are assigned to each of the plurality of PCSs 3, and the storage battery determining unit 13 determines the PCSs 3 with consecutive numbers as operating devices, and in each first period, Increment the smallest device number by one.

Generally, the second period, which is the period for determining the charge/discharge command value, is shorter than the first period. For example, the charge/discharge command value is determined at a cycle of 0.1 seconds. Further, the command value distribution unit 15 distributes the charge/discharge command value to the operating devices in the second cycle. Note that the determination cycle of the charge/discharge command value 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 cycle. In FIG. 3, the horizontal axis shows the elapsed time, and the vertical axis shows the charge/discharge command value. In FIG. 3, the first period is indicated as T _rot . Note that FIG. 3 is a schematic diagram, and the number of charge/discharge command values within the first period is not limited to the example of FIG. 3. As shown in FIG. 3, the charge/discharge command value changes within the first period. The command value distribution unit 15 distributes the charge/discharge command value to the storage batteries 2 to be operated every time the charge/discharge command value is determined. Therefore, when determining the number of storage batteries 2 to be operated, it is desirable to determine the number with a margin for the rated value of each storage battery 2. For example, when 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 the number of storage batteries 2 to be operated as 2, the charge/discharge command value If it subsequently exceeds 4 MW, the command value distributed to each PCS 3 will exceed the rated value.

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

In addition, in the case of discharging, since the charge/discharge command value is a negative value, 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. .

Furthermore, when determining the number of storage batteries 2 to be operated, for example, the storage battery determination unit 13 uses, for example, the average value of the previous first period. If the first period is 1 minute, the average value of charge/discharge command values for 1 minute is used. Thereby, 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. Note that the charging/discharging command value used when determining the number of storage batteries 2 to be operated is not limited to the average value of the charging/discharging command values of the previous first cycle, but also the charging/discharging command value of the immediately preceding first cycle. It may be the median value of the command values. Also, when using the average value of charge/discharge command values, the average value is not limited to the above example, and may be any value calculated 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 a storage battery control procedure in the storage battery control device 1 of this embodiment. The storage battery determining unit 13 determines whether it is the timing to determine which PCS 3 to operate (step S1). As described above, since the PCS 3 to be operated in the first cycle is determined, specifically, in step S1, for example, the storage battery determining unit 13 determines the PCS 3 to be operated in the first cycle after previously determining the PCS 3 to be operated. Determine whether or not the period has elapsed.

When it is not the timing to determine the PCS 3 to be operated (step S1 No), the storage battery determining unit 13 repeats step S1. If it is the timing to determine the PCS 3 to be operated (Step S1: Yes), the storage battery determination unit 13 calculates the average value of the charge/discharge command values (Step S2). In detail, the storage battery determining unit 13 reads, for example, the charging/discharging command values of the previous first cycle from the data storage unit 12, and calculates the average value of the read charging/discharging command values. Note that, as described above, instead of the average value of the charge/discharge command values, a value smoothed by other processing, such as a one-minute median value of the charge/discharge command values, may be used.

Next, the storage battery determining unit 13 determines the number of PCSs 3 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 PCS 3 to be operated. Specifically, in step S3, if the charge/discharge command value is 0 or less than a predetermined small value that can be regarded as 0, the storage battery determination unit 13 determines the number of PCSs 3 to be operated as 0. do. When the number of PCSs 3 to be operated is not 0, the storage battery determining unit 13 determines the number using the following procedure, for example. Let P _i be the rated value of PCS3 with number i, and let P _T be the average value of the charge/discharge command values. When the method of securing the margin is set to A% or more and less than B% of the rated value, the minimum k that satisfies the following formula (1) is determined as the number of PCSs 3. However, if P _T is smaller than (A/100)×P _i , the storage battery determining unit 13 determines the number of PCSs 3 to be operated to be 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)

Note that, as described above, the number i increases by 1 every first period. The above method for determining the PCS 3 to be operated is just one example, and may be determined according to the margin securing method, rotation rule, etc., and the method for determining the PCS 3 to be operated is not limited to the above-mentioned example. For example, you may change the number of increments in each first period, such as increasing the number i by 2 in each first period, or you can change the number of increments such as the 2nd, 4th, 6th, etc. in a certain first period. A rotation rule may be used, such as using storage batteries 2 with consecutive numbers among them, and using storage batteries 2 with consecutive numbers among odd numbers 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 determining unit 11 and assigns the charge/discharge command value to each PCS 3 based on the evaluation function set by the evaluation function setting unit 14, for example. Allocate. This evaluation function may be, for example, a function indicating the variation in SOC of each PCS 3 after charging and 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 PCS 3 after charging and discharging with the distributed command value. Further, the command value distribution unit 15 may equally distribute the command value to each PCS 3 without using an evaluation function. The command value distribution method is not limited to the example described above, 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). If 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 (No in step S6), the command value distribution unit 15 repeats step S6. FIG. 4 is an example, and any process that can obtain equivalent results may be used, and the specific process contents and order of processes can be changed as appropriate.

Here, the hardware configuration of the storage battery control device 1 will be explained. The charging/discharging command value determination section 11, the storage battery determination section 13, the evaluation function setting section 14, the command value distribution section 15, the command section 16, and the storage battery state acquisition section 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 charging/discharging 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 equipped with a processor. or dedicated hardware. The processing circuit is also called a control circuit.

When the processing circuit that realizes the charging/discharging 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 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 is applicable.

FIG. 5 is a diagram illustrating a configuration example of a processing circuit when the processing circuit is a circuit including a processor. When the processing circuit that realizes the charging/discharging 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, as shown in FIG. 5, it includes a processor 101 and a memory 102. When the processing circuit is the processing circuit shown in FIG. 5, each function of the charge/discharge command value determination unit 11, storage battery determination unit 13, evaluation function setting unit 14, command value distribution unit 15, command unit 16, and storage battery status acquisition unit 17 is realized by software, firmware, or a combination of software and firmware. Software or firmware is written as a program and stored in memory 102. In the processing circuit, each function is realized by the processor 101 reading and executing a 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 device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor). The memory 102 may also be a nonvolatile or volatile memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), or EEPROM (registered trademark) (Electrically EPROM). This includes semiconductor memory, magnetic disks, flexible disks, optical disks, compact disks, mini disks, and DVDs (Digital Versatile Discs).

Furthermore, a communication circuit including a receiver and a transmitter may be used to realize the storage battery determination section 13, the evaluation function setting section 14, the command section 16, and the storage battery state acquisition section 17. Furthermore, the memory that implements the data storage section 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, storage battery determination unit 13, evaluation function setting unit 14, command value distribution unit 15, command unit 16, and storage battery status acquisition unit 17 is partially realized by dedicated hardware, A portion may be implemented in software or firmware.

As described above, in this embodiment, the storage battery control device 1 controls the number of storage batteries 2 to be operated, that is, the number of PCSs 3 to be operated, so that the PCS 3 operates at an output that suppresses power loss based on the charge/discharge command value. The number of units is now determined. Thereby, power loss can be suppressed. Moreover, the storage battery control device 1 rotates the PCS 3 to be operated. For this reason, it is possible to suppress unevenness in the operating storage batteries 2. Therefore, since the frequency of use of the PCS 3 and the storage battery 2 can be made constant, the deterioration of the PCS 3 and the storage battery 2 can be equalized. Furthermore, in this embodiment, the storage batteries 2 to be operated are determined at a cycle longer than the determination cycle of the charge/discharge command value, and a margin is provided for the rated value when determining the number of PCSs 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. As long as the ratio of the output of the PCS3 to the rated value is above a certain level, there will be no big difference in the conversion efficiency of the PCS3, so if you decide which storage battery 2 to operate with a margin within the range where the power conversion efficiency does not decrease, the power conversion efficiency will be improved. The decrease can be suppressed. In addition, since the rotation rules are determined in advance and the storage battery 2 is rotated at a cycle longer than the determination cycle of the charge/discharge command value, the storage battery 2 can be determined with a simple process, and the frequency of determining the PCS 3 to be operated can be reduced. Since the processing load can be suppressed, the processing load can be suppressed.

The configurations shown in the embodiments above are merely examples, and can be combined with other known techniques, or can be combined with other embodiments, within the scope of the gist. It is also possible to omit or change 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 section, 12 data storage section, 13 storage battery determination section, 14 evaluation function setting section , 15 command value distribution section, 16 command section, 17 storage battery state acquisition section.

Claims (8)

A storage battery control device that controls a plurality of power conversion devices that charge and discharge each of a plurality of storage batteries, the storage battery control device comprising:
a charging/discharging command value determination unit that determines a total charging/discharging command value for the plurality of storage batteries;
Based on the charging/discharging command value and the rated value of the power converting device, the ratio of the command value distributed to each of the power converting devices to be operated to the rated value of the power converting device is a first value or more. a storage battery determining unit that determines an 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 determining unit determines the operating device so as to rotate the operating device in each of the first cycles. The charging/discharging command value determining unit determines the charging/discharging command value in a second period shorter than the first period,
The command value distribution unit distributes the charge/discharge command value to the operating devices in the second period,
The storage battery control device according to claim 1, wherein the storage battery determining unit determines the operating device so that a command value to be distributed to the operating device is a value smaller than a rated value of the power conversion device. The storage battery control device according to claim 2, wherein the storage battery determining unit determines the operating device based on an average value calculated using a plurality of the charge/discharge command values. The storage battery determining unit determines the operating device such that a ratio of a command value to be distributed to the operating device to a rated value of the power conversion device is equal to or less than a second value less than 1. Item 3. Storage battery control device according to item 3. 4. The storage battery determining unit determines the operating device so that the command value to be distributed to the operating device is equal to or less than a value obtained by subtracting a certain value from the rated value of the power conversion device. 4. The storage battery control device according to 4. A consecutive number is assigned to each of the multiple power conversion devices,
The storage battery determining unit determines the power conversion devices having consecutive numbers as the operating devices, and increments the smallest number among the numbers of the operating devices by one in each first cycle. The storage battery control device according to any one of claims 1 to 5. multiple storage batteries,
a plurality of power conversion devices capable of charging and discharging each of the plurality of storage batteries and being interconnected to a power grid;
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 comprising: 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 charging/discharging command value determining step of determining a total charging/discharging command value for the plurality of storage batteries;
Based on the charging/discharging command value and the rated value of the power converting device, the ratio of the command value distributed to each of the power converting devices to be operated to the rated value of the power converting device is a first value or more. a storage battery determining step of determining an operating device, which is the power conversion device, to be operated in each first cycle;
a command value distribution step of distributing the charge/discharge command value to the operating devices;
run the
A program characterized in that, in the storage battery determining step, the operating device is determined such that the operating device is rotated every first cycle.

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