WO2020175186A1

WO2020175186A1 - Control system, power source control system, control method, and program

Info

Publication number: WO2020175186A1
Application number: PCT/JP2020/005832
Authority: WO
Inventors: 真小曽根
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2019-02-26
Filing date: 2020-02-14
Publication date: 2020-09-03

Abstract

The purpose of the present disclosure is to provide a control system, a power source control system, a control method, and a program which can improve power conversion efficiency in a plurality of power conversion units. The control system (1) controls a power source system (2) that includes a plurality of power source devices (20) having power conversion units (22). The control system (1) comprises an estimation unit (13) and an operation control unit (14). The estimation unit (13) estimates the power conversion efficiency characteristics of each of the plurality of power convertors (22) during operations periods of one or more power source devices (20) of the plurality of power source devices (20). The operation control unit (14) controls operations of the plurality of power convertors (22) on the basis of the estimation result of the estimation unit (13).

Description

\¥02020/175186 1 ?01/^2020/005832

Specification

Title of invention:

Control system, power supply control system, control method, and program

Technical field

The present disclosure relates generally to a control system, a power supply control system, a control method, and a program, and more particularly, to a control system, a power supply control system, a control method, which controls a power supply system including a plurality of power supply devices. And program related background art

[0002]Patent Document 1 describes a battery system (power supply control system) that efficiently charges a plurality of battery modules.

The battery system of Patent Document 1 includes a power supply device that supplies electric power, a battery device, and a control device (control system). The battery device includes a plurality of substantially the same battery units in parallel, each of which includes a power conversion unit that converts the power supplied from the power supply unit and a battery module that charges the power converted by the power conversion unit. Connected and configured. The control device should supply power among the plurality of battery units connected in parallel according to the amount of power supplied from the power supply device and considering the predetermined power conversion efficiency of the power conversion unit. Select the battery unit.

[0004] In Patent Document 1, the battery unit is selected based on a predetermined power conversion efficiency stored in the storage unit. However, the power conversion efficiency of the power converter may change depending on the operating state. Therefore, in some cases, the actual power conversion efficiency of the power conversion unit is different from the predetermined power conversion efficiency stored in the storage unit. Therefore, when the power conversion unit is operated based on the predetermined power conversion efficiency, the power conversion efficiency may decrease.

Prior art documents

Patent literature 〇 2020/175 186 2 卩 (: 171-1? 2020 /005832

[0005] Patent Document 1: Patent No. 5 1 5 6 1 1 2

Summary of the invention

[0006] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a control system, a power supply control system, a control method, and a program capable of improving the power conversion efficiency in a plurality of power conversion units. To do.

[0007] A control system according to an aspect of the present disclosure controls a power supply system including a plurality of power supply devices including a power conversion unit. The control system includes an estimation unit and a motion control unit. The estimation unit estimates the characteristic of the power conversion efficiency of each of the plurality of power conversion units during the operation period of one or more power supply units of the plurality of power supply units. The operation control unit controls the operations of the plurality of power conversion units based on the estimation result of the estimation unit.

[0008] A power supply control system according to an aspect of the present disclosure includes the control system and the power supply system.

[0009] A control method according to an aspect of the present disclosure is a method of controlling a power supply system including a plurality of power supply devices including a power conversion unit. The control method includes an estimation process and an operation control process. In the estimation process, the characteristic of the power conversion efficiency of each of the plurality of power conversion units during the operation period of one or more power supply devices of the plurality of power supply devices is estimated. In the operation control process, the operations of the plurality of power conversion units are controlled based on the estimation result of the estimation process.

[0010] A program according to an aspect of the present disclosure causes a computer system to execute the control method.

Brief description of the drawings

[001 1] [Fig. 1] Fig. 1 is a block diagram of a control system and a power supply control system according to an embodiment of the present disclosure.

[Figure 2] Figure 2 is a graph of the characteristics of power conversion efficiency.

[Fig. 3] Fig. 3 is an operation flow chart of the above control system.

MODE FOR CARRYING OUT THE INVENTION

[0012] The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is 〇 2020/175 186 3 卩 (：171? 2020 /005832

However, the present invention is not limited to the embodiment and the modified examples. Other than this embodiment and modifications, various modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present disclosure.

(Embodiment)

(1) Outline

As shown in FIG. 1, the control system 1 according to the present embodiment is a control system that controls the power supply system 2. The power supply system 2 includes a plurality (three in this embodiment) of power supply devices 20. The power supply control system 10 according to the present embodiment includes a control system 1 and a power supply system 2.

[0014] Each power supply device 20 is, for example, an energy storage system (Mitsumi 33: [3rd person ""396 System). Each power supply device 20 has a power conversion unit 2 2 and a storage battery 2 3. The power supply device 20 is electrically connected to the power system 5 and the load 4. The power conversion unit 2 2 charges the storage battery 2 3 with the power supplied from the power system 5 and stores it in the storage battery 2 3. The stored electric energy is output to the load 4. The power supply device 20 includes, for example, office buildings, offices, factories, warehouses, stores (including complex facilities such as shopping centers), parks, schools, hospitals, stations. Installed in non-residential facilities such as airports or parking lots, etc. The power supply unit 20 can be installed not only in non-residential facilities but also in residential facilities such as collective housing or detached houses.

A plurality of power supply devices 20 are installed in one facility, and the plurality of power supply devices 20 output electric energy to a common load 4. In the following description, in order to distinguish a plurality of power supply devices 20, they are referred to as a power supply device 208, a power supply device 20, and a power supply device 200.

[0016] The control system 1 is configured to control the power supply system 2 (the plurality of power supply devices 20). The control system 1 may be installed in the same facility as the plurality of power supply devices 20 or may be installed in a facility different from the plurality of power supply devices 20. In the present embodiment, as an example, it is assumed that the control system 1 is installed in the same facility as the plurality of power supply devices 20.

[0017] The control system 1 is a network such as an internet as a lower system. 〇 2020/175 186 4 卩 (: 171? 2020 /005832

— It is configured to be able to communicate with the higher-level system 3 via the network 6. The host system 3 is installed, for example, at a place distant from the facility where a plurality of power supply units 20 are installed. The control system 1 is a system capable of controlling a plurality of power supply devices 20 by communicating with the host system 3. Here, the “upper” of the higher system 3 and the “lower” of the lower system are merely used as labels for distinguishing the two, and are not meant to specify their respective positions and ranks. Absent.

The control system 1 controls each power supply device 20 according to the prediction information acquired by communication with the host system 3. As a result, in the control system 1, for example, not only the power consumption value at the current load 4 but also the power consumption value at the future load 4 etc. are taken into consideration for each power supply unit 20. It can be executed and the power supply unit 20 can be efficiently controlled.

[0019] Each power supply device 20 functions as an emergency power supply during a power failure of the power system 5. Further, the control system 1 controls each power supply unit 20 so that, for example, it is possible to monitor the usage status of electric energy in a facility where a plurality of power supply units 20 are installed and to efficiently use the electric energy. Becomes Further, the control system 1 controls each power supply unit 20 to realize functions such as peak shift or peak cut for avoiding concentration of the power supplied from the power system 5. it can. As a result, by introducing the control system 1 and the power supply system 2, it is possible to stabilize the supply of electric power, monitor the usage of electric energy and use it efficiently, and stabilize the power system 5. It is possible.

[0020] The control system 1 estimates the characteristic of the power conversion efficiency (efficiency characteristic) of each of the plurality of power conversion units 2 2 during the operation period of one or more of the plurality of power supply units 20. Then, the control system 1 controls the operations of the plurality of power conversion units 22 based on the estimated efficiency characteristics.

[0021] The characteristics of the power conversion efficiency (efficiency characteristics) in the power conversion unit 22 may change depending on the operating state of the power supply device 20. In the control system 1 of this embodiment Estimates the efficiency characteristics of one or more power supply units 20 among the plurality of power supply units 20 during the operation period, and controls the operation of each power conversion unit 22 based on the estimation result. As a result, in the control system 1 of the present embodiment, it is possible to improve the power conversion efficiency of the plurality of power conversion units 22.

[0022] (2) Details

Hereinafter, the detailed configurations of the control system 1 and the power supply system 2 will be described with reference to FIGS. 1 to 3.

The control system 1 is configured to be able to communicate with the host system 3.

In the present disclosure, “communicable” means that information can be exchanged directly or indirectly via a network 6 or a relay by a suitable communication method such as wire communication or wireless communication. That is, the control system 1 and the upper system 3 can exchange information with each other.

[0024] The control system 1 and the host system 3 are capable of bidirectional communication with each other, and are capable of transmitting information from the host system 3 to the control system 1 and transmitting information from the control system 1 to the host system 3. Both are possible. In this embodiment, the control system 1 and the host system 3 are configured to be communicable via a public network 6 such as the Internet.

The control system 1 is a system for controlling the plurality of power supply devices 20 as described above. Therefore, the control system 1 is configured to communicate with not only the host system 3 but also each power supply device 20. The control system 1 controls the operation of the power conversion unit 22 of each power supply unit 20 by outputting control information to each power supply unit 20.

[0026] In the present embodiment, the control system 1 mainly has a computer system including a memory and a processor. That is, the functions of the control system 1 are realized by the processor executing the program recorded in the memory of the computer system. The program may be recorded in a memory in advance, may be provided through an electric communication line such as the Internet, or may be recorded and provided in a non-transitory recording medium such as a memory card. [0027] The power supply device 20 includes a communication unit 21, a power conversion unit 22, a storage battery 23, and a measurement unit 24.

[0028] The communication unit 21 is a communication interface, and is configured to be communicable with the control system 1 (the second communication unit 12 thereof) by an appropriate communication method such as wired communication or wireless communication. There is. The communication unit 21 is capable of bidirectional communication with the control system 1.

The storage battery 23 is, for example, a secondary battery such as a lithium ion battery. Storage battery

23 can store (charge) electric energy and discharge (discharge) the stored electric energy.

The power conversion unit 22 is, for example, a power conditioner (PCS: Power Condition System) and has a power conversion circuit. The power conversion circuit has, for example, power devices including semiconductor switching elements, electronic components such as transformers, capacitors, inductors, etc., and performs power conversion from AC power to DC power and from DC power to AC power. It is configured to be capable of power conversion. That is, the power conversion unit 22 is configured to be capable of bidirectional power conversion between AC power and DC power. The power conversion unit 22 may be configured to be able to perform power conversion from DC power to DC power or AC power to AC power.

The power conversion unit 22 charges and discharges the storage battery 23 by performing power conversion. Specifically, the power converter 22 is electrically connected to the power grid 5. The power conversion unit 22 charges the storage battery 23 by converting the AC power supplied from the power system 5 into DC power and outputting the DC power to the storage battery 23. The power conversion unit 22 also discharges the storage battery 23 by converting the electric energy (DC power) stored in the storage battery 23 into alternating current power and outputting it to the load 4.

The power conversion unit 22 charges and discharges the storage battery 23 according to the control information from the control system 1. The control information from the “Sai I” control system 1 includes, for example, command values such as the charging period of the storage battery 23, the charging power value (or power amount), the discharging period, and the discharging power value (or power amount). Has been. 〇 2020/175 186 7 卩 (：171? 2020 /005832

The measuring unit 24 is configured to measure the operating state of the power supply device 20. The “operating state of the power supply device 20” in the present disclosure is information related to the operation (operation) of the power supply device 20 and includes, for example, voltage information, temperature information, and the like. In the present embodiment, the measurement unit 24 has a voltage measurement unit 2 4 1 and a temperature measurement unit 2 4 2.

[0034] The voltage measurement unit 2 41 measures the input voltage of the power conversion unit 2 2 as the operating state (voltage information) of the power supply device 20. The input voltage of the power conversion unit 22 is the system voltage input from the system power source to the power conversion unit 22 and the battery voltage input from the storage battery 23 to the power conversion unit 22. The voltage measurement unit 2 41 may be configured to measure only one of the system voltage and the battery voltage.

[0035] The temperature measurement unit 2 42 measures the temperature of the power conversion unit 2 2 as the operating state (temperature information) of the power supply device 20. The temperature of the power conversion unit 22 is, for example, the temperature of electronic components (power device, transformer, coil, etc.) that constitute the power conversion circuit.

The measuring unit 24 may be configured to include only one of the voltage measuring unit 2 4 1 and the temperature measuring unit 2 4 2.

The measuring unit 24 repeatedly measures the operating state of the power supply device 20 at least during the operation period of the power supply device 20. The operation period is a period during which the power supply device 20 is operating, and a period during which the power conversion unit 22 is performing power conversion. In other words, the operating period is the period during which the storage battery 23 is being charged or discharged. The measuring unit 24 repeatedly measures the operating state of the power supply device 20 at a predetermined cycle, for example. The predetermined cycle is a time cycle shorter than the operation period, and is, for example, 1 minute, 5 minutes, 10 minutes, or the like. In the present embodiment, the measuring unit 24 repeatedly measures not only the operating period of the power supply device 20 but also the operating state of the power supply device 20 during the standby period of the power supply device 20. The standby period of the power supply device 20 is a period during which the power supply device 20 is not operating, that is, the power supply device 20 is activated but the power conversion unit 2 2 performs power conversion (charging and discharging of the storage battery 23). ) Is not performed. As a result, the measuring unit 24, at the start of the operation period of the power supply unit 20, 〇 2020/175 186 8 卩 (：171? 2020 /005832

Alternatively, the operating state of the power supply device 20 immediately before the start can be measured. Note that the measurement unit 24 may start the measurement of the operating state of the power supply unit 20 by using the measurement start command output from the control system 1 before the start of the operation period of the power supply unit 20 as a trigger. ..

[0038] The measurement unit 24 outputs the measurement result of the operating state of the power supply device 20 to the control system 1 via the communication unit 21.

[0039] In the power supply device 20, the communication unit 21 and the measurement unit 24 are the power conversion unit.

2 2 may be included. In other words, the power converter 22 may have a function of communicating with the control system 1 and a function of measuring the operating state.

[0040] The control system 1 has a first communication unit 11, a second communication unit 12, an estimation unit 13, an operation control unit 14, and a storage unit 15. Of these, the estimation unit 13 and the operation control unit 14 are realized as one function of a computer system including a memory and a processor.

[0041] The first communication unit 11 is a communication interface, and is configured to be communicable with the host system 3 by an appropriate communication method such as wired communication or wireless communication. In the present embodiment, the first communication unit 11 is configured to be communicable with the higher-level system 3 via the public network 6 such as the Internet.

[0042] The second communication unit 12 is a communication interface, and is configured to be able to communicate with (the communication unit 21 of) the power supply device 20 by an appropriate communication method such as wired communication or wireless communication. .. The second communication unit 12 is configured to be able to communicate with each of the plurality of power supply devices 20.

[0043] The estimation unit 13 determines the characteristics of the power conversion efficiency of each of the plurality of power conversion units 2 2 during the operation period of one or more power supply units 20 among the plurality of power supply units 20 (hereinafter referred to as the efficiency characteristic). To say). The power conversion efficiency is the ratio of the output power to the input power of the power conversion unit 22. The efficiency characteristics are the power conversion efficiency [%] for the output power [!< \^/] of the power converter 22 (see Fig. 2) or the power conversion efficiency [% for the input power [!< \^/]. ] And other characteristics related to changes in power conversion efficiency. Here, the characteristics of the power conversion efficiency may change according to the operating state of the power supply device 20. For example, even when the power conversion unit 22 outputs a predetermined output power, the power conversion efficiency may decrease due to the temperature rise of the power conversion unit 22.

The estimation unit 13 acquires the measurement result of the operating state of the power supply device 20 measured by the measurement unit 24 of each power supply device 20 via the second communication unit 12. Then, the estimation unit 13 uses the obtained measurement result of the operating state of the power supply unit 20 to determine the power conversion unit 2 2 of each power conversion unit 2 2 during the operation period of one or more power supply units 20. Estimate power conversion efficiency characteristics (efficiency characteristics). Specifically, the estimation unit 13 estimates the efficiency characteristic by referring to the database stored in the storage unit 15 based on the acquired measurement result of the operating state of the power supply device 20.

[0046] The storage unit 15 is a memory selected from ROM (Read On Memory), RAM (Random Access Memory), or EEPROM (Electric Memory). Composed of devices. The storage unit 15 stores the efficiency characteristics corresponding to various conditions of the operating state of the power supply device 20 as a database. Various operating conditions include, for example, input voltage (system voltage, battery voltage), temperature of power converter 22 divided into ranges (voltage range or temperature range, etc.), and combined with each other. It is a condition.

The estimation unit 13 refers to the database of the storage unit 15 and acquires the acquired power supply device.

Extract the efficiency characteristics that match the measurement results of the operating state of 20. The estimation unit 13 outputs the extracted efficiency characteristic as an estimation result to the operation control unit 14. The estimating unit 13 may be configured to calculate (estimate) the efficiency characteristic by a calculation process using the acquired measurement result of the operating state of the power supply device 20.

The operation control unit 14 generates control information corresponding to each power supply device 20 based on the prediction information from the host system 3 and the estimation result (efficiency characteristic) of the estimation unit 13 and generates the control information. The control information is output to each power supply device 20 to control each power supply device 20.

[0049] The "prediction information" referred to in the present disclosure refers to the operation of the power supply system 2 (power supply device 20). 〇 2020/175 186 10 (:171? 2020 /005832

Information that includes relevant future predictions, for example, a set of prediction values related to the operation of the power supply system 2. Examples of predicted values include the power consumption value (or power amount) at load 4, the output power value (or power amount) of power supply system 2, the threshold value used to control power supply system 2, and the state of storage battery 23. .. The state of the storage battery 23 is, for example, the temperature of the storage battery 23, the state of charge of the storage battery 23 (3 〇： 513163

Including etc. In addition, the prediction information includes information that lists (combinations) of these prediction values for each time zone (for example, every hour). Furthermore, the forecast information also includes the time of day when the electric power company or electric power aggregator issues a request such as peak cut or peak shift. In addition, the forecast information includes information on both the demand and supply of electric power in the power supply system 2. As an example of the information on the demand for electric power in the power supply system 2, there is information on the charging electric power value (or electric energy) of each storage battery 23. As an example of the information regarding the supply of electric power in the power supply system 2, there is information regarding the output electric power value (or electric energy) of the power supply system 2. That is, in this embodiment, the prediction information is information necessary for predicting both the output and the input of the power supply system 2.

[0050] The prediction information includes the operation plan of the power supply system 2. The operation plan is a plan showing the operation period of the power supply system 2 (power supply device 20) and the input or output power value (or electric energy) during the operation period. The operating period of the power supply system 2 is a period in which one or more power supply devices 20 among the plurality of power supply devices 20 are operating, and a period in which the power conversion unit 22 is performing power conversion. In other words, the operation period of the power supply system 2 is the operation period of one or more power supply devices 20 among the plurality of power supply devices 20. Hereinafter, the input or output power value (or power amount) is also referred to as charge/discharge power. The operation plan includes the charging plan and discharging plan for the power supply system 2. The charging plan is a plan showing the charging period in which the power supply system 2 (power supply device 20) charges the storage battery 23 with the electric power from the power grid 5, and the charging power value (or charging power amount) in the charging period. is there. The discharge plan is a discharge period in which power is output from the storage battery 23 of the power supply system 2 to the load 4, and the output power value during the discharge period. 〇 2020/175 186 1 1 卩 (: 171? 2020 /005832

(Or the amount of output power).

Based on the estimation result (efficiency characteristic) of the estimation unit 13 the operation control unit 14 determines the power conversion unit 2 of each power supply device 20 during the operation period (charge period, discharge period) of the power supply system 2. The operation command of 2 is generated as control information. The charging/discharging power indicated by the operation plan is the charging/discharging power of the power supply system 2 (plurality of power supply units 20) as a whole, that is, the total charging/discharging power obtained by adding the charging/discharging power of each power supply unit 20. .. The operation control unit 14 determines the distribution of the charging/discharging power of each of the plurality of power supply devices 20 based on the efficiency characteristics estimated by the estimation unit 13.

[0052] Specifically, the operation control unit 14 determines, based on the efficiency characteristics estimated by the estimation unit 13 that the power conversion efficiencies of the plurality of power conversion units 2 2 during the operation period of the power supply system 2 meet a predetermined condition. The charging/discharging power of each power supply device 20 is determined so as to satisfy the above condition. The power conversion efficiency of multiple power conversion units 22 is the ratio of the total output power to the total input power of each power conversion unit 22, that is, the power conversion efficiency of the entire power supply system 2. is there. The predetermined condition is a condition that maximizes the power conversion efficiency of the plurality of power conversion units 22. That is, the operation control unit 14 determines the distribution of the charging/discharging power of each power supply device 20 so that the power conversion efficiency of the power supply system 2 as a whole is maximized. The predetermined condition is not limited to the condition that the power conversion efficiencies of the plurality of power conversion units 22 are maximized, and, for example, the condition that the power conversion efficiencies of the plurality of power conversion units 22 are equal to or greater than a threshold value that is smaller than the maximum. It may be.

[0053] Further, the operation control unit 14 determines whether each power supply unit 20 has a power supply unit 20 based on the charge state (300) of the storage battery 23 in each power supply unit 20 and the deterioration state (30! ^~ 1). Distribution of charge/discharge power may be determined. For example, the operation control unit 14 determines the distribution of the charging/discharging power of each power supply device 20 so that the storage battery 23 having a high value of 30 (3 or 3 0 1 ^to 1) is preferentially used.

The operation control unit 14 uses the operation command corresponding to the charging/discharging power of each power supply device 20 determined based on the estimation result (efficiency characteristic) of the estimation unit 13 as control information and the second communication unit. Output to each power supply unit 20 via 1 2. In the power supply device 20, the power conversion unit 22 inputs the charging/discharging power indicated by the control information received via the communication unit 21. 〇 2020/175 186 12 boxes (: 171-1? 2020 /005832

Or, it operates so as to be output.

[0055] (3) Operation example

Hereinafter, an operation example of the control system 1 according to the present embodiment will be described with reference to FIGS. 2 and 3.

Here, a case where the storage battery 23 is discharged and power is supplied to the load 4 during the discharging period (operating period of the power supply system 2) will be described as an example.

In each of the plurality of power supply devices 20, the measurement unit 24 measures the operating state of the power supply device 20 and sends the measurement result to the control system 1 via the communication unit 21.

The estimation unit 13 performs an acquisition process for acquiring the operating state of the power supply device 20 measured by the measurement unit 24 of each power supply device 20 via the second communication unit 12 (3 1) .. That is, the estimation unit 13 acquires the operating status of each of the plurality of power supply devices 20.

The estimation unit 13 estimates the characteristic of the power conversion efficiency (efficiency characteristic) of each power supply unit 20 based on the acquired measurement result of the operating state of each of the plurality of power supply units 20. Do (3 2). In the present embodiment, the estimation unit 13 refers to the database of the storage unit 15 and extracts the efficiency characteristic corresponding to the acquired measurement result of the operating state of each power supply device 20, thereby Estimate the efficiency characteristic corresponding to 0.

[0060] Here, it is assumed that the efficiency characteristic of each power supply device 20 at the start of the discharge period (operating period of the power supply system 2) estimated by the estimation unit 13 is the first efficiency characteristic 1 (see FIG. 2). ). In the first efficiency characteristic 1, the power conversion efficiency reaches a peak of 10 when the output power is X I 0. In the 1st efficiency characteristic 1, if the output power increases or decreases below X 10, the power conversion efficiency becomes less than 10

The estimation unit 13 outputs the estimated efficiency characteristic (first efficiency characteristic 1) to the operation control unit 14.

The operation control unit 14 performs an operation control process (33) that controls the operation of the plurality of power conversion units 2 2 based on the estimation result of the estimation unit 13 (first efficiency characteristic 1). 〇 2020/175 186 13 卩(：171? 2020/005832

Specifically, the operation control unit 14 acquires the operation plan (discharge plan) as the prediction information from the higher-level system 3 via the first communication unit 11, and the operation plan (discharge plan) and the estimation unit 1 are acquired. Based on the efficiency characteristic (1st efficiency characteristic 1) estimated by 3 and, control information corresponding to each power supply unit 20 is generated and output.

[0063] In the present embodiment, the operation control unit 14 controls the control information corresponding to each power supply device 20 so that the power conversion efficiency of the plurality of power conversion units 2 2 (the entire power supply system 2) is maximized. Is generated and output. Here, it is assumed that the target output power of the power supply system 2 indicated by the discharge plan (total output power of the plurality of power supply devices 20) is 3. As an example, the target output power X 3 is twice the output power X I 0 (see Fig. 2) (3 = 1 10 X 2). In this case, the operation control unit 14 controls the output power X 1 0 of each of the two power supply units 2 0 (for example, power supply units 20 8 and 20 0) of the three power supply units 20 during the discharging period. Output and generate and output control information so that the remaining one power supply unit 200 does not output power.

[0064] In the power supply devices 20 and 20, the power conversion unit 22 is based on the control information from the operation control unit 14 so that the output power supplied to the load 4 becomes X10. Discharge 2 3 In addition, in the power supply device 200, the power conversion unit 22 does not supply power to the load 4, that is, does not discharge the storage battery 23, based on the control information from the operation control unit 14. At this time, as shown in FIG.

At 20 m, the efficiency characteristic is the first efficiency characteristic 1, so the output power X 10 is output, and the power conversion efficiency becomes a peak 10 10. Therefore, the power conversion efficiency of the power supply system 2 also reaches a peak of 10.

In the present embodiment, the measurement unit 24 repeatedly measures the operating state of the power supply device 20 at a predetermined cycle and transmits the measurement result to the control system 1.

[0066] The estimation unit 13 acquires the latest measurement result (operational state of the power supply unit 20) in the measurement unit 24, and based on the acquired measurement result, the efficiency characteristic corresponding to each power supply unit 20. Estimate (update) (3 1, 3 2). In other words, the estimation unit 13 repeatedly estimates (updates) the efficiency characteristics corresponding to each power supply device 20 over time. Then, the operation control unit 14 is based on the updated estimation result (efficiency characteristic). 〇 2020/175 186 14 卩 (: 171-1? 2020 /005832

Then, the control information output to each power supply unit 20 is updated (33).

[0067] Here, the operating state of the power supply device 20 may change as the power supply device 20 operates. For example, the temperature of the power conversion unit 22 may increase as the power conversion unit 2 2 performs the power conversion operation. In this operation example, it is assumed that the operation state changes from the start of the discharge period due to the power conversion operation of the power conversion unit 22 in the power supply devices 20 and 20. The estimation unit 13 updates the efficiency characteristics corresponding to the power supply units 20 8 and 20 based on the operating state of the power supply units 20 and 20 after the change.

Here, it is assumed that the efficiency characteristic corresponding to the power supply devices 20 8 and 20 0 newly estimated by the estimation unit 13 is the second efficiency characteristic 2 (see FIG. 2). In the second efficiency characteristic 2, when the output power is X20, the power conversion efficiency becomes a peak of 20. In the second efficiency characteristic 2, when the output power increases or decreases below 20, the power conversion efficiency becomes smaller than 20. Further, the output power X 20 is smaller than the output power X 10 and the power conversion efficiency 20 is smaller than the power conversion efficiency 10. Further, in the second efficiency characteristic 2, the power conversion efficiency 21 at the output power X 10 is smaller than the peak power conversion efficiency 20.

[0069] Further, since the power supply device 200 did not perform the power conversion operation, it is assumed that the efficiency characteristic corresponding to the power supply device 20 (3 estimated by the estimation unit 13 is up to the first efficiency characteristic 1. To do.

[0070] The operation control unit 14 is configured to perform a plurality of power conversions based on the second efficiency characteristic 2 corresponding to the power supply devices 20 and 20 and the first efficiency characteristic 1 corresponding to the power supply device 20 (3). The control information corresponding to each power supply device 20 is updated so that the power conversion efficiency of the unit 22 (entire power supply system 2) is maximized.

[0071] In the present operation example, the operation control unit 14 controls the power supply devices 20 and 20 to output power X

Outputs 20 and generates and outputs the control information so that the power supply unit 200 outputs the output power X 1 1. As described above, the target output power of the power supply system 2 indicated by the discharge plan (total output power of the plurality of power supply devices 20) is 3. The target output power 3 is the sum of twice the output power 20 and the output power XI 1 ( 〇 2020/175 186 15 卩 (: 171-1? 2020 /005832

3 = 2 20 2 X I 1). The output power X11 is greater than the output power X20 and less than the output power XIO. In the first efficiency characteristic 1, the power conversion efficiency 11 when the output power is X 11 is larger than the power conversion efficiency 20.

[0072] In the power supply devices 20 and 20, the power conversion unit 22 stores the power so that the output power supplied to the load 4 becomes X20 based on the control information from the operation control unit 14. Discharge pond 2 3 Further, in the power supply device 200, the power conversion unit 22 discharges the storage battery 23 so that the output power supplied to the load 4 becomes X 1 1 based on the control information from the operation control unit 14. ..

[0073] In the second efficiency characteristic 2, the power conversion efficiency when the output power is X 2 0

20 and the power conversion efficiency 11 when the output power is X 11 in the first efficiency characteristic 1 is the power conversion efficiency when the output power is X 10 in the second efficiency characteristic 2. Greater than efficiency 2 1 In other words, although the efficiency characteristics have changed due to the changes in the operating states of the power supply units 208 and 20, the power supply units 208 and 20 output the output power X 1 0. Compared to the case of continuous operation, the power conversion efficiency of the entire power supply system 2 is improved.

[0074] In this operation example, the power supply system 2 supplies power to the load 4, that is, the storage battery.

The case of discharging 23 is described as an example, but the same applies to the case where the power supply system 2 is supplied with power from the power system 5, that is, the storage battery 23 is charged. In this case, the operation control unit 14 uses the storage battery 2 of each power supply unit 20 so as to maximize the power conversion efficiency of the plurality of power conversion units 2 2 based on the efficiency characteristics estimated by the estimation unit 13. Determine the charging power of 3. In this case, the charge amount of the storage battery 23 may differ among the plurality of power supply devices 20 depending on the operating state of each power supply device 20.

As described above, in the control system 1 of the present embodiment, the efficiency characteristic that varies depending on the operating state of the power supply device 20 is estimated, and the power conversion of each power supply device 20 is performed based on the estimated efficiency characteristic. Controls the operation of part 22. As a result, the power conversion efficiency of the plurality of power conversion units 22 can be improved.

[0076] In this operation example, the target output power X3 is output from the power supply system 2. 〇 2020/175 186 16 卩(：171? 2020/005832

For this reason, the power supply units 20 and 20 output the output power X 2 0 and the power supply unit 2 0 0 outputs the output power XI 1, but the magnitude of these output powers is an example. It It suffices that the magnitude of the output power of the power supply units 208 to 200 is determined so that the power conversion efficiency of the entire power supply system 2 is maximized. For example, the output of the power supply units 208 and 20 The power may be less than 20 and the power output of the power supply 200 may be greater than X 11.

That is, the operation control unit 14 maximizes the power conversion efficiency of the entire power supply system 2 based on the efficiency characteristics of each power supply device 20 (for example, the first efficiency characteristic 1 and the second efficiency characteristic 2). As described above, the magnitude of the output power of the power supply units 208 to 200 for outputting the target output power 3 is arbitrarily determined. For example, the operation control unit 14 is a power supply unit required to output the target output power X 3 when the output power of each of the power supply units 20 and 20 is changed continuously or at predetermined intervals. Find the magnitude of the output power of 200. The operation control unit 14 calculates the power conversion efficiency of the entire power supply system 2 at this time by calculation based on the first efficiency characteristic 1 and the second efficiency characteristic 2. Then, the operation control unit 14 selects the power supply units 20 to 20 (combination of the output power magnitudes of 3 that maximizes the power conversion efficiency of the entire power supply system 2 and selects each power supply based on the selection result. It controls the power converter 22 of the device 20.

Further, in the present operation example, the operation control unit 14 controls so that the output powers of the power supply devices 20 and 20 are equal in magnitude to each other. This facilitates the control of the power supply devices 208, 20 by the operation control unit 14. Note that it is not essential that the output powers of the power supply units 20 and 20 have the same magnitude, and they may have different magnitudes.

As an example of a method for controlling the power conversion efficiency of the power supply system 2 as a whole, the operation control unit 14 sets the power conversion efficiency and the output power or the input power of each power conversion unit 2 2. It may be configured to control each power supply device 20 based on the above. For example, the operation control unit 14 determines that the sum of the multiplication values of the power conversion efficiency and the output power of each power conversion unit 22 in the plurality of power supply units 20 is the maximum. 〇 2020/175 186 17 卩(：171? 2020/005832

Thus, each power supply device 20 may be controlled.

Further, in this operation example, the estimation unit 13 repeats the estimation of the efficiency characteristics with the lapse of time, and the operation control unit 14 determines the plurality of power conversion units 2 2 based on the latest estimation result. Controls the operation of, but is not limited to this. For example, if the change in the estimation result of the estimation unit 13 with the passage of time satisfies a predetermined trigger condition, the motion control unit 14 determines that a plurality of results are obtained based on the estimation result of the estimation unit 13 after the change (latest). The operation of the power conversion unit 22 may be controlled. The trigger condition is, for example, the difference in the power conversion efficiency corresponding to the current output power is equal to or greater than a threshold value before or after the change in the efficiency characteristic estimated by the estimation unit 13 or the ratio of the difference in the power conversion efficiency is equal to or greater than the threshold value. The condition is that In other words, if the operation control unit 14 determines that the power conversion efficiency is changing significantly based on the estimation result of the estimation unit 13, the plurality of power conversion units 2 2 based on the latest efficiency characteristics are calculated. Update the control contents. As a result, the processing load on the operation control unit 14 can be reduced.

[0081] (4) Modification

(4.1) First modified example

In the example described above, the measuring unit 24 repeatedly measures the operating state of the power supply device 20. Then, at different times during the operation period of the power supply system 2, the estimation unit 13 estimates the characteristics of the power conversion efficiency of each of the power conversion units 2 2 and the operation control unit 14 determines the power consumption based on the estimation result. It controlled the operation of the converter 22. That is, the power conversion units 22 are controlled so that the power conversion efficiency of the power supply system 2 as a whole is maximized at each time during the operation period of the power supply system 2, but the present invention is not limited to this configuration.

[0082] The control system 1 schedules each power conversion unit 22 to maximize the power conversion efficiency of the power supply system 2 as a whole during the operating period (charge period, discharge period) of the power supply system 2. You may control.

Specifically, the estimation unit 13 acquires the measurement result of the operating state of each power supply device 20 at the start (or immediately before) of the operation period of the power supply system 2. Furthermore, the estimation unit 13 acquires the prediction information (including the operation plan) from the higher-level system 3. 〇 2020/175 186 18 卩 (：171? 2020 /005832

It Then, the estimation unit 13 estimates the fluctuation of the operating state of each power supply device 20 during the operation period of the power supply system 2 based on the measurement result of the operating state of each power supply device 20 and the prediction information. The estimation unit 13 estimates the efficiency characteristic for each predetermined unit time during the operation period of the power supply system 2 based on the estimated fluctuation of the operating state of each power supply device 20. The predetermined unit time is a time shorter than the operating period of the power supply system 2, and is, for example, 10 minutes, 15 minutes, 30 minutes, or the like.

Based on the efficiency characteristics of the power supply system 2 for each predetermined unit time estimated by the estimation unit 13 for each predetermined unit time, the operation control unit 14 sets each predetermined unit time for the operation period of the power supply system 2. In addition, schedule control is performed to control the operation of multiple power converters 22. Specifically, the operation control unit 14 converts each power conversion unit every predetermined unit time so that the plurality of power conversion units 2 2 (entire power supply system 2) in the operation period of the power supply system 2 satisfy the predetermined condition. Determines the operation of part 22. The predetermined condition is a condition that maximizes the power conversion efficiency of the plurality of power conversion units 2 2 (the entire power supply system 2) during the operation period of the power supply system 2. In other words, the predetermined condition is a condition in which the product value of the power conversion efficiencies of the plurality of power conversion units 2 2 (entire power supply system 2 as a whole) per predetermined unit time during the operation period of the power supply system 2 is the maximum. is there.

As described above, in the control system 1 of the present modification, the operation control unit 14 controls the power supply system 2 based on the fluctuation of the operating state of each of the plurality of power supply devices 20 during the operation period of the power supply system 2. In order to maximize the power conversion efficiency of the power supply system 2 during the above operating period, schedule control is performed to control the operation of each power supply conversion unit for each predetermined unit time during the operating period of the power supply system 2.

[0086] This makes it possible to improve the power conversion efficiency of the plurality of power conversion units 2 2 throughout the operation period of the power supply system 2.

[0087] (4.2) Second Modification

The power supply system 2 may be configured to transfer power between a plurality of power supply devices 20.

[0088] As shown in FIG. 2, when the output power is relatively small, the power conversion efficiency is low. 〇 2020/175 186 19 卩(：171? 2020/005832

It For example, in the first efficiency characteristic 1, the slope of the power conversion efficiency in the area where the power conversion efficiency reaches the peak of 10 and the output power is smaller than X 10 is in the area where the output power is larger than X 10. Is larger than the slope of the power conversion efficiency. Therefore, when the output power of any one of the plurality of power conversion units 22 is relatively small, the power conversion efficiency of the entire power supply system 2 may decrease.

Therefore, the operation control unit 14 controls the electric energy stored in the storage battery 23 in at least one power supply unit 20 among the plurality of power supply units 20 to generate at least one power supply unit 20. The operation of the power conversion unit 22 is controlled so that the power is output to another power supply device 20 different from. That is, the storage battery 23 of the other power supply device 20 is used as a load.

For example, assume that the target output power supplied to the load 4 in the power supply system 2 as a whole is X 4. The target output power 4 is the sum of the output power X I 0 and the output power X I 2. Here, it is assumed that the efficiency characteristic of each power supply device 20 is the first efficiency characteristic 1. The operation control unit 14 controls the power conversion unit 22 of the power supply device 20 to supply the output power X 10 to the load 4. Further, the operation control unit 14 causes the power conversion unit 22 of the power supply unit 20 to supply the output power X 1 2 to the load 4, and the difference between the output power X 10 and the output power X 1 2 Control to supply power X 120 to the power supply unit 200. The differential power X I 2 0 is greater than the output power X 1 2. Therefore, the output power of the power supply unit 20 is X 100. Further, the operation control unit 14 charges the storage battery 23 with the power (differential power XI 20) supplied from the power supply device 20 to the power supply device 20 (the power conversion unit 22 of 3). To control.

That is, the power supply unit 20 regards the storage battery 23 of the power supply unit 200 as the load 4 and supplies a part of the output power X I 0 (differential power X I 20 ). As a result, the power supply units 20 and 20 output the output power X 10 at which the power conversion efficiency reaches a peak of 10. As a result, the power conversion efficiency of the plurality of power conversion units 22 (the entire power supply system 2) can be improved.

[0092] As described above, the operation control unit 14 controls at least one of the plurality of power supply devices 20. 〇 2020/175 186 20 (:171? 2020/005832

In one power supply unit 20, the difference power between the target value (XI 0) of the output power of the storage battery 23 and the target value (XI 2) of the output power from the storage battery 23 to the load 4 (the difference power XI 2 0 ) Is controlled from the storage battery 23 to the other power supply device 20.

[0093] (4.3) Third Modified Example

In addition to the prediction information from the higher-level system 3 and the estimation results (efficiency characteristics) of the estimation unit 13, the operation control unit 14 determines multiple power conversion units based on the time zone of the operation period of the power supply system 2. The operation of 2 2 may be controlled.

[0094] The unit price of electricity supplied from the power system 5 to the power supply system 2 or the load 4 may vary depending on the time of day. In general, the unit price of electricity is often set lower during the night hours than during the day hours. The data on the electricity rate unit price for each time period is included in the forecast information acquired from the upper system 3.

[0095] The operation control unit 14 calculates the prediction information from the higher-level system 3 (electricity charge unit price for each time period), the efficiency characteristics estimated by the estimation unit 13 and the time period of the operation period of the power supply system 2. , The plurality of power conversion units 22 are operated so that the electricity charge of the power supplied from the power system 5 to the power supply system 2 or the load 4 becomes low. For example, when charging the storage battery 23, the operation control unit 14 uses the efficiency characteristics estimated by the estimation unit 13 based on the time period when the unit price of electricity is lower during the operation period (charging period) of the power supply system 2. , Each power conversion unit 22 is operated so as to charge the storage battery 23 with higher power conversion efficiency. Further, when discharging the storage battery 23, the operation control unit 14 is based on the efficiency characteristics estimated by the estimation unit 13 at a time when the unit price of electricity is higher than the operating period (discharge period) of the power supply system 2. Then, each power conversion unit 22 is operated so as to discharge the storage battery 23 with higher power conversion efficiency.

With this, in the control system 1 of the present modification, it is possible to control the power conversion unit 22 in consideration of the time zone of the operation period of the power supply system 2.

[0097] (4.4) Other Modifications The above-mentioned embodiment (and modification) is only one of various embodiments (and modification) of this indication. The above-described embodiments (and modified examples) can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.

The function similar to that of the control system 1 may be embodied by a control method, a computer program, or a non-transitory recording medium recording the program. The control method according to one aspect is a method of controlling a power supply system 2 including a plurality of power supply devices 20 each having a power conversion unit 22. The control method includes an estimation process and a motion control process. In the estimation process, the characteristics of the power conversion efficiency of each of the plurality of power conversion units 22 during the operation period of one or more power supply devices 20 of the plurality of power supply devices 20 are estimated. In the operation control process, the operation of the plurality of power conversion units 22 is controlled based on the estimation result of the estimation process. A (computer) program according to one aspect is a program for causing a computer system to execute the control method described above.

[0099] The control system 1 in the present disclosure includes a computer system.

The computer system mainly consists of a processor and memory as hardware. The function as the control system 1 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunication line, or may be recorded in a non-transitory recording medium such as a computer system-readable memory card, optical disk, hard disk drive, etc. May be provided. A computer system processor is composed of one or more electronic circuits including a semiconductor integrated circuit (C) or a large scale integrated circuit (LS I). The integrated circuit such as C or LS I referred to here depends on the degree of integration, and is called a system LSI, VLS I (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). including. In addition, the F-PGA (Field-Programmable Gate Array), which is programmed after the manufacturing of the LS 丨, or the reconfiguration of the junction relation inside the LS I or the reconfiguration of the circuit section inside the LS I can be performed. 〇 2020/175 186 22 卩 (: 171-1? 2020 /005832

It can also be used as a processor for possible logical devices. The plurality of electronic circuits may be integrated in one chip, or may be distributed and provided in the plurality of chips. The plurality of chips may be integrated in one device, or may be distributed and provided in the plurality of devices. As used herein, a computer system includes a microcontroller that has one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including semiconductor integrated circuits or large-scale integrated circuits.

[0100] Also, it is not an essential configuration for control system 1 that multiple functions of control system 1 are integrated in one chassis, and the components of control system 1 are distributed over multiple chassis. It may be provided. Furthermore, at least a part of the functions of the control system 1, for example, the functions of the estimation unit 13 and the operation control unit 14 may be realized by a cloud (cloud computing) or the like.

[0101] Further, in the above-mentioned example, the control system 1 is configured to be communicable with the host system 3 via the network 6, but the configuration is not limited to this. The control system 1 is connected to the host system 3 via a communication line, for example,

Eight "68 1|/\/0" 10 It may be configured to perform communication, etc. In this case, the host system 3 is provided in the housing of the control system 1 and can accept operations from the user. In addition, an operation panel or the like capable of displaying the operation content and the like may be provided.

[0102] In the example described above, the higher-level system 3 generates the prediction information, but the control system 1 may generate the prediction information.

[0103] Further, in the above-described example, the operation control unit 14 controls each power supply device 20 based on the prediction information (operation plan) and the efficiency characteristics estimated by the estimation unit 13. However, it is not limited to this. For example, the operation control unit 14 may control each power supply device 20 based on the power command corresponding to the current target output power and the efficiency characteristic estimated by the estimation unit 13. 〇 2020/175 186 23 卩 (：171? 2020 /005832

[0104] (Summary)

A control system (1) according to the first aspect controls a power supply system (2) including a plurality of power supply devices (20) having a power conversion section (2 2 ). The control system (1) includes an estimation unit (1 3) and an operation control unit (1 4). The estimation unit (1 3) estimates the characteristics of the power conversion efficiency of each of the plurality of power conversion units (2 2) during the operation period of one or more of the plurality of power supply units (20). To do. The operation control unit (1 4) controls the operation of the plurality of power conversion units (2 2) based on the estimation result of the estimation unit (1 3).

[0105] According to this aspect, the operation of each power conversion unit (2 2) can be controlled based on the characteristics of the power conversion efficiency estimated by the estimation unit (1 3 ), so that a plurality of power sources can be controlled. The power conversion efficiency of the converter (22) can be improved.

[0106] In the control system (1) according to the second aspect, in the first aspect, the estimation unit (1

3) estimates the characteristics of power conversion efficiency based on the measurement results of the operating states of multiple power supply units (20).

According to this aspect, it is possible to improve the accuracy of estimating the characteristics of the power conversion efficiency of each of the plurality of power conversion units (22).

[0108] In the control system (1) according to the third aspect, in the first or second aspect, the estimation unit (13) estimates the characteristic of the power conversion efficiency with the passage of time or a change in the operating state. ..

According to this aspect, it is possible to control the operation of the plurality of power conversion units (22) by following a specific change in the power conversion efficiency.

[0110] In the control system (1) according to the fourth aspect, in any one of the first to third aspects, the motion control section (1 4) is configured so that the estimation result of the estimation section (1 3) changes. When a predetermined ligature condition is satisfied, the operation of the plurality of power conversion units (2 2) is controlled based on the estimation result of the changed estimation unit (1 3).

[0111] According to this aspect, it is possible to reduce the processing load of the operation control section (14).

[0112] The control system (1) according to the fifth aspect provides the control system according to any one of the first to third aspects. \¥02020/175 186 24 (: 17 2020/005832

Then, the operation control unit (14) controls the operation of the plurality of power conversion units (2 2) for each of the plurality of power conversion units (2 2) at every predetermined unit time during the operation period.

According to this aspect, it is possible to control the plurality of power conversion units (2 2) so that the operation contents of the plurality of power conversion units (2 2) change according to time.

[0114] In the control system (1) according to the sixth aspect, in any one of the first to fifth aspects, the operation control unit (14) includes a plurality of power conversion units (2 2) during an operation period. The operation of multiple power converters (22) is controlled so that the power conversion efficiency of the power converter satisfies the specified conditions.

[0115] According to this aspect, it is possible to improve the power conversion efficiency during the operation period.

In the control system (1) according to the seventh aspect, in the sixth aspect, the predetermined condition is that the power conversion efficiency of the power supply system (2) as a whole is maximum.

[0117] According to this aspect, it is possible to maximize the power conversion efficiency.

[0118] In the control system (1) according to the eighth aspect, in any one of the first to seventh aspects, the operation control section (14) includes a plurality of power supply devices (20) during the operation period. The operation of the multiple power converters (22) is controlled based on the fluctuations in the operating status of each power converter.

According to this aspect, it is possible to determine the operation content of the plurality of power conversion units (2 2) in consideration of the fluctuation of the operating state of the power supply device (20 ).

[0120] In the control system (1) according to the ninth aspect, in each of the first to eighth aspects, each of the plurality of power supply devices (20) includes a storage battery (23).

[0121] According to this aspect, it is possible to improve the charging efficiency and the discharging efficiency of the storage battery (23).

[0122] In the control system (1) according to the tenth aspect, in the ninth aspect, the operation control section (14) includes at least one power supply device (20) among the plurality of power supply devices (20). , So that the electric energy stored in the storage battery (23) is output to another power supply (20) different from at least one power supply (20). 〇 2020/175 186 25 卩 (: 171-1? 2020 /005832

, Controls the operation of the power converter (22).

[0123] According to this aspect, it is possible to suppress a decrease in power conversion efficiency due to the output power being too low.

[0124] In the control system (1) according to the eleventh aspect, in the tenth aspect, the operation control section (14) includes at least one power supply device (20) out of the plurality of power supply devices (20). ), the difference power between the target value of the output power of the storage battery (2 3) and the target value of the output power of the storage battery (2 3) to the load (4) is transferred from the storage battery (2 3) to another power supply ( It controls the operation of the power converter (22) so that it is output to (20).

[0125] According to this aspect, it is possible to suppress a decrease in power conversion efficiency due to the output power being too low.

[0126] In the control system (1) according to the 12th aspect, in any one of the 1st to 11th aspects, the operation control section (1 4) includes the estimation result of the estimation section (1 3), and the operation period. The operation of the plurality of power conversion units (22) is controlled based on the time period between them.

According to this aspect, it is possible to determine the operation content of the plurality of power conversion units (2 2) according to the time zone of the operation period.

[0128] A power supply control system (10) according to a 13th aspect includes a control system (1) according to any one of the 1st to 12th aspects and a power supply system (2).

[0129] According to this aspect, it is possible to improve the power conversion efficiency of the plurality of power conversion units (2 2) in the power supply system (2).

[0130] The control method according to the fourteenth aspect is a method of controlling a power supply system (2) including a plurality of power supply devices (20) having a power conversion section (22). The control method includes an estimation process and an operation control process. In the estimation process, the characteristics of the power conversion efficiency of each of the plurality of power conversion units 6 (2 2) during the operation period of at least one power supply unit (20) among the plurality of power supply units (20) are estimated. In the operation control process, the operations of the multiple power converters (22) are controlled based on the estimation result of the estimation process.

[0131] According to this aspect, based on the characteristic of the power conversion efficiency estimated by the estimation unit (13). 〇 2020/175 186 26 卩 (：171? 2020 /005832

Moreover, since the operation of each power conversion unit (2 2) can be controlled, the power conversion efficiency of the plurality of power conversion units (2 2) can be improved.

A program according to the fifteenth aspect causes a computer system to execute the control method according to the fourteenth aspect.

[0133] According to this aspect, the operation of each power conversion unit (2 2) can be controlled based on the characteristics of the power conversion efficiency estimated by the estimation unit (1 3 ), so that it is possible to control a plurality of power sources. The power conversion efficiency of the converter (22) can be improved. Explanation of symbols

[0134] 1 Control system

1 0 power control system

1 3 Estimator

1 4 Motion control section

2 power system

20 power supply

2 2 Power converter

2 3 Storage battery

Claims

\¥02020/175 186 27 (: 17 2020/005832 Claims

[Claim 1] A control system for controlling a power supply system including a plurality of power supply devices having a power conversion unit,

An estimation unit that estimates the characteristics of the power conversion efficiency of each of the plurality of power conversion units during the operation period of one or more power supply units of the plurality of power supply units,

An operation control unit that controls the operation of the plurality of power conversion units based on the estimation result of the estimation unit;

Control system.

2. The estimation unit estimates the characteristic of the power conversion efficiency based on the measurement results of the operating states of the plurality of power supply devices.

The control system according to claim 1.

[Claim 3] The estimation unit estimates the characteristic of the power conversion efficiency with the passage of time or a change in operating state,

The control system according to claim 1 or 2.

[Claim 4] When the change in the estimation result of the estimation unit satisfies a predetermined trigger condition, the operation control unit determines, based on the estimation result of the estimation unit after the change, the plurality of power conversion units described above. Control the movement,

The control system according to any one of claims 1 to 3.

5. The operation control unit controls, with respect to the plurality of power conversion units, operations of the plurality of power conversion units at every predetermined unit time in the operation period.

The control system according to any one of claims 1 to 3.

6. The operation control unit controls operations of the plurality of power conversion units so that power conversion efficiencies of the plurality of power conversion units in the operation period satisfy a predetermined condition.

The control system according to any one of claims 1 to 5.

[Claim 7] The predetermined condition is that the power conversion efficiency of the entire power supply system is the highest. 〇 2020/175 186 28 卩 (：171? 2020 /005832

It is a big condition,

The control system according to claim 6.

8. The operation control unit controls operations of the plurality of power conversion units based on fluctuations in operating states of the plurality of power supply devices and the power supply devices during the operation period.

The control system according to any one of claims 1 to 7.

[Claim 9] Each of the plurality of power supply devices has a storage battery,

The control system according to any one of claims 1 to 8.

10. The operation control unit, in at least one power supply device among the plurality of power supply devices, uses the electric energy stored in the storage battery as a power source different from that of the at least one power supply device. Control the operation of the power converter to output to the device,

The control system according to claim 9.

[Claim 11] In the at least one power supply device, the operation control unit supplies, from the storage battery, electric power that is a difference between a target value of output power of the storage battery and a target value of output power from the storage battery to a load. Controlling the operation of the power converter so as to output to another power supply device,

The control system according to claim 10.

12. The operation control unit controls operations of the plurality of power conversion units based on an estimation result of the estimation unit and a time zone of the operation period.

The control system according to any one of claims 1 to 11.

[Claim 13] The control system according to any one of claims 1 to 12,

And a power supply system,

Power control system.

[Claim 14] A control method for controlling a power supply system including a plurality of power supply devices having a power conversion unit, comprising:

An estimation process for estimating the characteristics of the power conversion efficiency of each of the plurality of power conversion units during the operation period of one or more of the plurality of power supply devices. 〇 2020/175 186 29 卩 (: 171-1? 2020 /005832

Reason

An operation control process for controlling the operation of the plurality of power conversion units based on the estimation result in the estimation process.

Control method.

[Claim 15] A program for causing a computer system to execute the control method according to claim 14.