JP2023019074A - Power storage interface conversion device, power storage control method, and power storage control program - Google Patents

Abstract

To provide a power storage interface conversion device that can construct a power storage system that is used for a power management system including an apparatus of a predetermined standard in which an EV or the like is utilized as a rechargeable battery, enhances versatility of the apparatus of the predetermined standard, is inexpensive, and has high flexibility in selecting a capacity.SOLUTION: A power storage interface conversion device 20 according to an embodiment of the present invention is connectable to a charging/discharging device 10 connected to an AC power supply system, having a first standard, and capable of charging/discharging a power storage device of the first standard, and a power storage device 30 having a second standard different from the first standard, converts the first standard and the second standard to each other, and converts information concerning charging/discharging communicated between the charging/discharging device 10 and the power storage device 30 having the second standard to information corresponding to the respective standards.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electricity storage interface conversion device, an electricity storage control method, and an electricity storage control program.

In recent years, various power storage systems with a capacity of about 3 KWH to 10 KWH for home use (hereinafter sometimes referred to as "ESS") have been introduced as a measure for leveling renewable energy for home use and as a countermeasure against power outages in the event of an emergency. Although it has been commercialized, it was expensive because it required a dedicated charging/discharging device. In addition, in order to level out huge amounts of renewable energy such as mega solar, a virtual power plant (hereinafter referred to as "VPP") that integrates multiple household storage batteries and relatively small-capacity power storage devices and controls them as a large power storage device. There is a thing called this.) technology has progressed.

Against this background, V2H (abbreviation of "VEHICLE TO HOME") equipment is becoming popular as a dedicated interface standard for charging the built-in storage battery of electric vehicles (hereinafter sometimes referred to as "EV"). Development of a power management system (hereinafter sometimes referred to as "EVPS") that is equipped with this V2H device and uses an EV as a storage battery is also underway. The EVPS is a system that charges the battery of an EV with household AC power, or conversely, converts the power discharged from the battery into household AC power that can be used to drive home appliances. , the spread of such technology is expected.

As a system using V2H equipment, Patent Literature 1 describes a power storage system that can cope with surplus charging while avoiding a shortage of power stored in an in-vehicle storage battery.

Further, Patent Literature 2 describes a power conversion system capable of charging/discharging with a power distributor in the home via a first electric line electrically connected to a storage battery of an electric vehicle.

Further, Patent Literature 3 describes a power supply system that enables charging/discharging with a V2H standard charging/discharging connector by providing a V2H standard charging/discharging interface unit in a stationary storage battery device.

JP 2020-031484 A JP 2015-208198 A JP 2015-220782 A

In the power storage system described in Patent Document 1, charging and discharging with an electric vehicle is possible via the V2H stand, but the V2H stand is dedicated to the electric vehicle and is connected to the stationary storage battery unit by separate dedicated wiring. It is

In the power conversion system described in Patent Document 2, charging and discharging with an electric vehicle is possible with a V2H standard power converter, but if another stationary storage battery is used, a separate power conversion device is prepared. There is a need to.

In the power supply system described in Patent Literature 3, the battery needs to be provided with a V2H standard charge/discharge interface, so a dedicated battery is required.

In the power systems of Patent Documents 1 and 2, the V2H stand is dedicated to electric vehicles, and a dedicated power converter and dedicated wiring are required to connect to other stationary storage battery units. In addition, installation of a stationary storage battery complicates the system and places restrictions on the installation location of the dedicated power converter and dedicated wiring.

In addition, in the power supply system described in Patent Document 3, since it is necessary to provide a V2H standard charging/discharging interface in the battery, a dedicated battery is required, and a commercially available battery cannot be used.

Accordingly, an object of the present invention is to provide an electric storage system that is used in a power management system that uses equipment such as an EV as a storage battery and that is equipped with equipment that conforms to a prescribed standard. It is to provide a power storage interface conversion device that can be constructed.

The above object of the present invention can be achieved by the following configurations. That is, the power storage interface conversion device according to the embodiment of the present invention is
a charging/discharging device connected to an AC power supply system, having a first standard, and capable of charging/discharging a power storage device of the first standard;
a power storage device having a second standard different from the first standard;
can connect to
converting between the first standard and the second standard;
The charging/discharging device and the power storage device having the second standard are converted into information corresponding to the respective standards.

According to the embodiment of the present invention, it is used in a power management system equipped with a device of a predetermined standard using an EV or the like as a storage battery. can be provided.

1 is a diagram showing a usage mode of an electricity storage system in which an electricity storage interface conversion device is used; FIG. 1 is a schematic diagram of a power storage system; FIG. 1 is a block diagram of a power storage system; FIG. 1 is a wiring diagram of a power storage system; FIG. 4 is a sequence diagram of the power storage system; FIG. FIG. 3 is a diagram for explaining information processing performed by a power storage interface conversion device regarding charge/discharge information; FIG. 10 is a diagram for explaining another information processing performed by the power storage interface conversion device regarding charging/discharging information; It is a usage example of the power storage interface conversion device.

Hereinafter, a power storage interface conversion device, a power storage control method, and a power storage control program according to embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below exemplify a power storage interface conversion device, a power storage control method, and a power storage control program for embodying the technical idea of the present invention, and the present invention is not limited to these. It is equally applicable to other embodiments within the scope of the claims.

[First embodiment]
A power storage interface conversion device, a power storage control method, and a power storage control program according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG.

FIG. 1 is a diagram showing a usage mode of a power storage system 100 in which a power storage interface conversion device is used. The power storage system 100 includes an electric vehicle charging/discharging device 10 (hereinafter referred to as “EVPS”) having an electric vehicle charging/discharging interface standard “V2H”, and a power storage interface conversion device 20 (hereinafter referred to as “V2H-IF”). , and a power storage device 30 (Energy Storage System, hereinafter referred to as “ESS”) having a unique charge/discharge interface standard.

The EVPS 10 is connected to a household AC system via a distribution board D, and is equipped with a V2H standard charging/discharging plug. It can be connected to a connector of a vehicle (hereafter referred to as "EV"). As a result, the EVPS 10 converts AC power from the home AC system into DC power to charge the EV, and vice versa, converts DC power from the EV into AC power and supplies it to the home AC system. is also possible.

The charge/discharge connector 11 of the EVPS 10 can also be connected to the connector 21 of the V2H-IF 20 . V2H-IF 20 is connected to ESS 30 having its own standard. The V2H-IF 20 has an interface function between the V2H standard EVPS 10 and the proprietary standard ESS 30 . As a result, the DC power supplied from the V2H standard EVPS 10 charges the ESS 30 via the V2H-IF 20, and conversely, the DC power discharged from the ESS 30 charges the EVPS 10 via the V2H-IF 20. DC power is supplied, and the EVPS 10 converts the DC power supplied from the ESS 30 into AC power and supplies it to the domestic system.

FIG. 2 is a schematic diagram of the power storage system 100. As shown in FIG. The power and communication connection interface between the EVPS 10 and V2H-IF20 is the interface standard "V2H", and the power and communication connection interface between the V2H-IF20 and ESS30 is an interface standard unique to ESS30.

The EVPS 10 of the power storage system 100 is connected to a distribution board for a household AC power supply, and is connected via the distribution board to an AC power supply and a load device powered by the household AC power. The EVPS 10 of this power storage system 100 includes a charging/discharging connector 11 connected to a charging/discharging port of an EV (electric vehicle), and this charging/discharging connector 11 is connected to a connector 21 of the V2H-IF 20 .

The V2H-IF 20 of the power storage system 100 has a wired or wireless communication interface, has a function of connecting to the Internet, has a function of connecting to the big data service system 110 on the Internet N, and has a function of connecting to the big data service system 110. It has a function to write detailed data such as battery capacity, charge/discharge history, and battery deterioration information obtained from the ESS 30 to the virtual storage 111 inside, and reads command data from the virtual storage 111 and controls charge/discharge of the power storage system 100. has the function of In the big data service system 110, it is possible to make detailed supply and demand forecasts for each household, a predetermined regional unit, and each power system such as a wide-area power system by machine learning using the collected big data. is. Although not particularly limited, deep learning or the like can be adopted for machine learning, and big data can include, for example, weather data, date and time, calendar information, event information, news and article information, and the like.

The maintenance control system 112 is connected to the Internet N, collects battery information written from the V2H-IF 20 of the power storage system 100 stored in the virtual storage 111 of the big data service system 110, predicts failure or failure, It has a function to remotely stop charging and discharging as needed. A plurality of power storage systems 100 are similarly connected to the big data service system 110 via the Internet N, and data is accumulated in the virtual storage 111 in the big data service system 110 .

The V2H-IF 20 is a device that converts the unique charge/discharge interface of the ESS 30 into the EV interface standard "V2H". This V2H-IF20 is provided, and the ESS30 is connected to the EVPS10 via the V2H-IF20. By constructing the energy storage system 100 in this way, it is possible to construct an inexpensive energy storage system 100 with a high degree of freedom in capacity selection that allows the inexpensive EVPS 10 to be used as a charging/discharging device for the ESS 30 . Therefore, the V2H-IF20 extracts battery information using the unique charge/discharge interface provided by the ESS30, converts it to the format and procedures determined by the V2H, and enables charging/discharging of the ESS30 via the EVPS10. It has the function of intermediary. In addition, the V2H-IF 20 has a function of adding information and procedures required by the V2H but not provided by the ESS 30 to mediate.

In addition, by connecting the ESS 30 to the EVPS 10 via the V2H-IF 20 to form the power storage system 100, it is possible to perform detailed maintenance and control of the power storage system 100 as a single unit. The power storage system 100 is controlled in an integrated manner, and a VPP (virtual power plant) system using a group of power storage systems 100 connected by a network N can be constructed. Therefore, the information communication function of the V2H-IF 20 is not only connected to the EVPS 10, but also has the function of being able to connect to the big data service system on the Internet N using wired or wireless means independently.

That is, the V2H-IF 20 actively or passively sequentially uploads information owned by the ESS 30 but not standardized by V2H (for example, battery charge/discharge amount, deterioration information, charge/discharge history, etc.) is sequentially downloaded, and the information can be remotely collected and remotely controlled from a location other than the location where the power storage system 100 is installed. Such a V2H-IF 20 has a function capable of integrally controlling a plurality of power storage systems 100 as well as the power storage system 100 as a single unit.

FIG. 3 is a block diagram of the power storage system 100. As shown in FIG. Each configuration of the power storage system 100 will be specifically described with reference to FIG. 3 .
<Specific Configuration of EVPS 10>
The EVPS 10 has a bi-directional inverter 12 , a switch 13 and a power controller 14 .

The bi-directional inverter 12 has a function of converting AC power into DC power and converts DC power into AC power, and charges and discharges the battery section 31 of the ESS 30 via the V2H-IF 20 . When charging the battery unit 31 , the bidirectional inverter 12 converts AC power supplied via the distribution board into DC power, and outputs the DC power obtained by the conversion to the battery unit 31 . Further, when the battery unit 31 discharges, the bidirectional inverter 12 converts the DC power supplied from the battery unit 31 into AC power, and supplies the AC power obtained by the conversion to the load device via the distribution board. do.

The switch 13 connects and disconnects the AC power supply and the bidirectional inverter 12 .

The power control device 14 includes a control section 14a and a communication section 14b.
The control unit 14a is connected to the bidirectional inverter 12, the switch 13, and the communication unit 14b, and communicates with the V2H-IF 20 via the communication unit 14b. The control unit 14a controls the bidirectional inverter 12 or the switch 13 so that the maximum current value of the bidirectional inverter 12 is equal to or less than the maximum chargeable/dischargeable current of the ESS 30 obtained from the V2H-IF20.

The communication unit 14b is a circuit that functions as an intermediary with the control unit 14a in order to enable communication with the V2H-IF 20. FIG. The communication standard of the communication unit 14b corresponds to CAN (Controller Area Network) communication.

<Specific configuration of V2H-IF20>
The V2H-IF 20 has a power supply unit 22, a switch 23, a voltage detection unit 24, a temperature detection unit 25, a current detection unit 26, a switch 27, a charge/discharge control unit 28, and a communication unit 29. are doing.

The power supply unit 22 is a power supply circuit that generates DC 12V from the power line of the ESS 30 .

The switch 23 is a switch 23 that supplies the 12V DC power of the power supply unit 22 to the EVPS 10, and is closed only when the V2H-IF 20 is independently operated only by the power of the ESS30.

The voltage detection unit 24 detects the voltage of the power line of the V2H-IF 20 and the local power supply.

The temperature detector 25 detects the temperature of the power line of the V2H-IF20.

The current detection unit 26 detects the current flowing through the power line that relays the EVPS 10 and the ESS 30 of the V2H-IF 20 .
The values detected by the voltage detection section 24, the temperature detection section 25 and the current detection section 26 are output to the control section 28a.
The control unit 28a determines the state of the V2H-IF 20 based on the voltage, temperature, and current information obtained from the voltage detection unit 24, the temperature detection unit 25, and the current detection unit 26. FIG.

A switch 27 opens and closes the power line of the V2H-IF 20 . The opening/closing operation of the switch 27 connects and disconnects the power line connected to the EVPS 10 .

The charge/discharge control unit 28 extracts the information of the battery unit 31 using the unique charge/discharge interface provided in the ESS 30, converts it into the format and procedure determined by V2H, and enables the charge/discharge of the ESS 30 to be performed via the EVPS 10. It has the function of intermediating In addition, the V2H-IF 20 has a function of adding information and procedures required by the V2H but not provided by the ESS 30 to mediate.

The charge/discharge control unit 28 includes a control unit 28a, a communication unit 28b, and a communication unit 28c.
The control unit 28a communicates with the EVPS 10 through the communication unit 28b, and communicates with the ESS 30 through the communication unit 28c. Further, the control unit 28a receives instructions from the EVPS 10 based on the V2H standard, and performs connection and disconnection with the EVPS 10 by the switch 27 by comprehensively judging the states of the ESS 30 and the V2H-IF 20.

The communication unit 28b is a circuit that functions as an intermediary with the control unit 28a in order to enable communication with the EVPS 10. FIG. The communication standard of the communication unit 28b corresponds to CAN (Controller Area Network) communication used for an in-vehicle network.

The communication unit 28c is a circuit that functions as an intermediary with the control unit 28a in order to enable communication with the ESS 30 . The communication standard of the communication unit 28c corresponds to the original standard of the ESS30. In this embodiment, RS485 is used as the communication standard of the communication unit 28c.

<Specific Configuration of ESS 30>
The ESS 30 has a battery section 31 and a charge/discharge interface section 32 .

The battery unit 31 has a plurality of battery cells connected in parallel and in series so that a predetermined voltage and capacity can be obtained.

The charge/discharge interface section 32 includes a battery management unit 32a, a voltage detection section 32b, a temperature detection section 32c, a current detection section 32d, and a communication section 32e.

The battery management unit 32a is connected to the voltage detection unit 32b, the temperature detection unit 32c, the current detection unit 32d, and the communication unit 32e. The current flowing and the temperature of the battery section 31 are monitored. The battery management unit 32a determines whether the battery section 31 can be charged or discharged, and sends information necessary for starting charging and discharging to the V2H-IF 20 via the communication section 32e.

The voltage detection unit 32b detects the voltage of the battery unit 31 and each cell voltage, and the temperature detection unit 32c detects the temperature of the battery unit 31. FIG. The current detection unit 26 detects current flowing through the power line of the battery unit 31 . The values detected by the voltage detector 32b, the temperature detector 32c, and the current detector 32d are output to the battery management unit 32a.

The communication unit 32e communicates with the communication unit 28c of the V2H-IF20. The communication standard of the communication unit 32e corresponds to the original standard of the ESS30. In this embodiment, RS485 is used as the communication standard of the communication unit 32e.

A fuse is provided in the power line connecting the battery section 31 and the current detection section 32d, and this fuse cuts off the current to prevent overheating when an excessive current flows through the power line. .

Next, charge/discharge control of ESS 30 by EVPS 10 via V2H-IF 20 in power storage system 100 will be described with reference to FIGS. 4 to 7. FIG. FIG. 4 is a wiring diagram of the power storage system 100. As shown in FIG. FIG. 5 is a sequence diagram of the power storage system 100. As shown in FIG. FIG. 6 is a diagram for explaining information processing performed by the electricity storage interface conversion device 20 regarding charge/discharge information, and FIG. 7 is a diagram for explaining another information processing performed by the electricity storage interface conversion device 20 regarding charge/discharge information. be.

<Regarding control performed by the power control device 14 of the EVPS 10>
When the operator connects the plug of the EVPS 10 to the socket of the V2H-IF 20, the power control device 14 outputs a charge/discharge start signal to the V2H-IF 20 (step S101). At this time, the "charge/discharge start/stop 1" line becomes DC 12V, and the "connector connection confirmation" line becomes GND level.

After that, the power control device 14 transmits the information of the EVPS 10 to the V2H-IF 20 (step S102).
By the processing of step S102, CAN communication between the EVPS 10 and the V2H-IF 20 is started, information necessary for charging is transmitted from the EVPS 10 to the V2H-IF 20, and the V2H-IF 20 determines whether charging/discharging is possible. be judged.

After that, the power control device 14 performs connector lock and insulation diagnosis (step S103).
Here, when the "charging/discharging permission prohibition" line becomes "permitted", that is, when the charging permission signal is received from the V2H-IF 20, the power control device 14 performs connector lock and insulation diagnosis. The connector is locked by automatically driving a lock mechanism (not shown) by the power control device 14 .

Thereafter, power control device 14 outputs a charge/discharge operation start signal to V2H-IF 20 (step S104). Then, the "charge/discharge start/stop 2" line becomes the "operating" level, and the V2H-IF 20 is instructed to start charging/discharging.

After that, the power control device 14 operates the bidirectional inverter 12 (step S105). Here, the power control device 14 periodically transmits information from the EVPS 10 side through CAN communication with the V2H-IF 20 and periodically receives charge/discharge information from the V2H-IF 20 . Based on the charge/discharge information received from the V2H-IF 20, the power control device 14 operates the bidirectional inverter 12 to charge/discharge the ESS 30 via the V2H-IF20.
The control unit 14a controls the switch 13 so that the maximum current value of the bidirectional inverter 12 is equal to or less than the maximum chargeable/dischargeable current obtained from the V2H-IF20.

Thereafter, the power control device 14 outputs a signal indicating output stop to the V2H-IF 20 via CAN communication (step S106). In addition, the power control device 14 considers the charge/discharge information received from the V2H-IF 20 through CAN communication in step S105, the state of the AC system in the home, etc., and prohibits charging/discharging of the V2H-IF 20 in step S106. Send a signal to instruct.

After that, when the V2H-IF 20 sets the "charging/discharging permission prohibition" line to "prohibit", that is, when the power control device 14 receives a signal from the V2H-IF 20 instructing to stop charging/discharging, the bidirectional inverter 12 is stopped (step S107).

After that, the power control device 14 unlocks the connector and confirms that the connector has been unlocked (step S108). In order to release the connector lock, the lock mechanism (not shown) is automatically driven from the locked state to the unlocked state by the power control device 14 . Power control device 14 confirms that the connector lock has been released by receiving the unlock signal.

After that, the power control device 14 terminates the CAN communication with the V2H-IF 20 (step S109).

After that, the EVPS 10 stops the DC 12V power supply from "DC12 (EVPS 10)" to the V2H-IF 20 (step S110). When the DC12V power supply is stopped, the V2H-IF 20 is powered down, and the connector connection between the EVPS 10 and the V2H-IF 20 can be released by the operator.

<Regarding the control performed by the charge/discharge control unit 28 of the V2H-IF 20>
First, the charge/discharge control unit 28 receives a charge start signal from the EVPS 10 . At this time, the "charge/discharge start/stop 1" line becomes DC 12V, and the "connector connection confirmation" line becomes GND level. Then, the V2H-IF 20 is activated and the connection of the connector is confirmed (step S201). Here, when the V2H-IF 20 is activated, the ESS 30 is activated by supplying DC12V power to the ESS 30 from the "DC12V (ESS30)" line.

Thereafter, the charge/discharge control unit 28 receives information necessary for charging from the ESS 30 via CAN communication and from the EVPS 10 via RS485 notification, determines whether charging/discharging is possible, and sets parameters for charging/discharging. Determine (S202). The information that the charge/discharge control unit 28 receives from the ESS 30 is specifically the type of battery such as a lithium ion battery, a phosphoric acid type lithium ion battery, a lead battery, the upper limit of charging voltage, and the upper limit of charging current. , discharge voltage lower limit, discharge current upper limit, total battery capacity, battery voltage (VB), remaining battery capacity (RC), abnormality flag, and the like.
In addition, the charge/discharge control unit 28 determines whether or not charging/discharging is possible from the abnormality flag. , charge voltage parameters VC1, VC2, VC3, VC4, charge current parameters IC1, IC2, IC3, discharge voltage parameter VD1, discharge current parameter ID1, and full charge parameters as full charge voltage Vcfull, full charge current Icfull, A full charge detection time Tmfull and a charge standby time Tmrecover are determined.

After that, the charge/discharge control unit 28 outputs a charge/discharge permission signal to the EVPS 10 (step S203). At this time, the "charging/discharging permission prohibition" line becomes the "permission" level.

After that, when the charge/discharge control unit 28 receives the charge/discharge operation start signal from the EVPS 10, that is, when the “charge/discharge start/stop 2” becomes the “active” level, the charge/discharge control unit 28 switches the switch 27 of the V2H-IF 20 is closed to turn it on (step S204). As a result, charging/discharging between the EVPS 10 and the ESS 30 via the V2H-IF 20 becomes possible.

Thereafter, the charge/discharge control unit 28 periodically receives information from the ESS 30 via CAN communication and from the ESS 30 via RS485 communication, and periodically transmits charge/discharge information to the EVPS 10 via CAN communication (step S205). .

As shown in FIG. 6, the charge/discharge control unit 28 calculates the upper limit charge current Icmax and the upper limit charge voltage Vcmax as charge/discharge information based on the parameters determined in step S202, and transmits them to the EVPS 10.
Note that the charge upper limit current Icmax is the upper limit current value at which the battery section 31 can be charged based on the detected voltage or the detected temperature of the battery section 31, and the charge upper limit voltage Vcmax is the charge upper limit voltage of the battery section 31. It is the upper limit voltage value at which the battery unit 31 can be charged based on the detected voltage or the detected temperature. Based on the charge upper limit current Icmax and the charge upper limit voltage Vcmax calculated by the charge/discharge control unit 28, the control unit 14a of the EVPS 10 determines whether charging is possible.
Specific examples of the charge upper limit current Icmax and the charge upper limit voltage Vcmax calculated by the charge/discharge control unit 28 are listed in (a) to (k) below.
(a) When the battery voltage VB detected by the voltage detector 24 is less than VC1, the charge/discharge controller 28 calculates Icmax=0 and Vcmax=VC1. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of charging the battery unit 31. FIG.
(b) When battery temperature TB detected by temperature detector 25 is less than TC1, charge/discharge controller 28 calculates Icmax=0 and Vcmax=VC3. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of charging the battery unit 31. FIG.
(c) When battery temperature TB detected by temperature detector 25 is higher than TC3, charge/discharge controller 28 calculates Icmax=0 and Vcmax=0. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of charging the battery unit 31. FIG.
(d) When the battery temperature TB detected by the temperature detection unit 25 is TC1 or more and less than TC2 and the battery voltage VB detected by the voltage detection unit 24 is VC1 or more and less than VC2, the charge/discharge control unit 28 sets Icmax=IC1, and Calculate Vcmax=VC2. Based on the calculated charging/discharging information, the control unit 14a of the power control device 14 determines permission to charge the battery unit 31. FIG.
(e) When battery temperature TB detected by temperature detector 25 is TC1 or higher and lower than TC2 and battery voltage VB is VC2 or higher and VC3 or lower, charge/discharge controller 28 calculates Icmax=IC2 and Vcmax=VC3. Based on the calculated charging/discharging information, the control unit 14a of the power control device 14 determines permission to charge the battery unit 31. FIG.
(f) When battery temperature TB detected by temperature detector 25 is TC1 or higher and lower than TC2 and battery voltage VB is higher than VC3, charge/discharge controller 28 calculates Icmax=0 and Vcmax=VC3. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of charging the battery unit 31. FIG.
(g) When the battery temperature TB detected by the temperature detection unit 25 is TC2 or more and TC3 or less and the battery voltage VB detected by the voltage detection unit 24 is VC1 or more and less than VC2, the charge/discharge control unit 28 sets Icmax=IC1, and Calculate Vcmax=VC2. Based on the calculated charging/discharging information, the control unit 14a of the power control device 14 determines permission to charge the battery unit 31. FIG.
(h) When TB detected by temperature detection unit 25 is TC2 or more and TC3 or less and battery voltage VB detected by voltage detection unit 24 is VC2 or more and less than VC4, charge/discharge control unit 28 sets Icmax=IC3 and Vcmax= Calculate VC4. Based on the calculated charging/discharging information, the control unit 14a of the power control device 14 determines permission to charge the battery unit 31. FIG.
(i) When battery temperature TB detected by temperature detection unit 25 is TC2 or higher and TC3 or lower and battery voltage VB detected by voltage detection unit 24 is higher than VC4, charge/discharge control unit 28 sets Icmax=0 and Vcmax= Calculate VC4. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of charging the battery unit 31. FIG.
(j) Under the above condition (h), when the battery voltage VB is equal to or higher than the full charge voltage VCfull and the battery current IB is equal to or lower than the full charge current Icfull, and the full charge detection time Tmfull or longer continues, The charge/discharge control unit 28 detects full charge, suspends charging for a certain period of time, calculates Icmax = 0 and Vcmax = VC4, and the control unit 14a of the power control device 14 sends a signal to the battery unit 31. is determined to be prohibited, and charging is resumed after the charging standby time Tmrecover has elapsed.

7, the charge/discharge control unit 28 calculates the discharge lower limit voltage Vdmin and the discharge upper limit current Idmax as charge/discharge information based on the parameters determined in step S202, and transmits them to the EVPS 10. Note that the discharge lower limit voltage Vdmin is the lower limit voltage value at which the battery unit 31 can discharge based on the detected voltage of the battery unit 31 or the detected temperature. This is the upper limit current value that allows the battery unit 31 to discharge based on the detected voltage or the detected temperature. Based on the charge upper limit current Icmax and the charge upper limit voltage Vcmax calculated by the charge/discharge control unit 28, the control unit 14a of the EVPS 10 determines whether or not discharge is possible.

Specific examples of the discharge lower limit voltage Vdmin and the discharge upper limit current Idmax calculated by the charge/discharge control unit 28 are listed in (1) to (O) below.
(l) When the battery voltage VB detected by the voltage detection unit 24 is less than VD1, the charge/discharge control unit 28 calculates Idmax=0 and Vdmin=VD1. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of discharging to the battery unit 31. FIG.
(m) When the battery voltage VB detected by the voltage detection unit 24 is VD1 or higher and the battery temperature TB detected by the temperature detection unit 25 is lower than TD1, the charge/discharge control unit 28 sets Idmax=0 and Vdmin=VD1. Calculate Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of discharging to the battery unit 31. FIG.
(n) When the battery voltage VB detected by the voltage detection unit 24 is VD1 or higher and the battery temperature TB detected by the temperature detection unit 25 is higher than TD2, the charge/discharge control unit 28 sets Idmax=0 and Vdmin=VD1. Calculate Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines prohibition of discharging to the battery unit 31. FIG.
(O) When the battery voltage VB detected by the voltage detection unit 24 is VD1 or more and the battery temperature TB detected by the temperature detection unit 25 is TD1 or more and TD2 or less, the charge/discharge control unit 28 sets Idmax=ID1 and Vdmin = Calculate VD1. Based on the calculated charge/discharge information, the control unit 14a of the power control device 14 determines permission to discharge to the battery unit 31. FIG.

After that, when the charge/discharge control unit 28 receives a signal indicating output stop from the EVPS 10 via CAN communication, the charge/discharge stop is confirmed (step S206). and output to ESS 30 (step S207). When a signal instructing to stop charging/discharging is output to the EVPS 10, the "charging permission prohibition" becomes the "prohibition" level. Further, when outputting a signal instructing to stop charging/discharging to the ESS 30, a signal instructing to stop charging/discharging is output through RS485 communication.

After that, the charge/discharge control unit opens the switch to stop the energization (step S208).

Thereafter, the charge/discharge control unit 28 terminates RS485 communication with the ESS 30 and CAN communication with the EVPS 10, and prepares for power down (step S209). Also, when the DC 12V power supply to the ESS 30 by "DC 12V (ESS30)" is stopped, the ESS 30 is powered down.

After that, when the power supply from the EVPS 10 is stopped, that is, when the DC 12V power supply is stopped from the "DC 12V (EVPS 10)" line, the charge/discharge control unit 28 powers down the V2H-IF 20 (step S210).

<Regarding control performed by the charge/discharge interface unit 32 of the ESS 30>
When the V2H-IF 20 is activated, power is supplied from the charge/discharge interface unit 32, that is, DC 12V power is supplied from "DC12V (ESS30)", and the ESS30 is activated (step S301).

After that, the charging/discharging interface unit 32 transmits information necessary for starting charging/discharging to the V2H-IF 20 via RS485 communication (step S302). Specifically, the information sent from the ESS 30 to the V2H-IF 20 includes the types of batteries such as lithium-ion batteries, phosphoric acid-type lithium-ion batteries, and lead-acid batteries, the upper limit of charging voltage, the upper limit of charging current, and the lower limit of discharging voltage. , discharge current upper limit, total battery capacity, battery voltage (VB), remaining battery capacity (RC), abnormality flag, and the like.

Thereafter, the charging/discharging interface unit 32 transmits information necessary for continuous charging/discharging operation to the V2H-IF via RS485 communication (step S303). Here, the information necessary for continuous charge/discharge operation includes the battery voltage detected by the voltage detector 24, the battery temperature detected by the temperature detector 25, an abnormality flag, and the like.

After that, when the charging/discharging interface unit 32 receives a signal instructing to stop charging/discharging from the V2H-IF 20 via RS485 communication, it prepares to power down the ESS 30 (step S304).

After that, when the power supply from the V2H-IF 20 is stopped, that is, when the DC 12V power supply from the "DC 12V (ESS 30)" line is stopped, the charge/discharge interface unit 32 powers down the ESS 30 (step S305). .

In the V2H-IF 20 according to the first embodiment of the present invention, an EVPS 10 connected to an AC power supply system, having a first standard and capable of charging and discharging a power storage device EV of the first standard, and the first standard is connectable to ESS 30 having a different second standard, converts between the first standard and the second standard, and is communicated between EVPS 10 and ESS 30 having the second standard. By converting information on discharge into information corresponding to each standard, EVPS 10 and ESS 30 with different standards are connected via V2H-IF 20 so as to be chargeable and dischargeable. It is possible to construct a power storage system that is inexpensive and has a high degree of freedom in capacity selection, by using it in a power management system equipped with equipment, increasing the versatility of equipment that conforms to a predetermined standard.

[Second embodiment]
A power storage interface conversion device, a power storage control method, and a power storage control program according to a second embodiment of the present invention will be described with reference to FIG.

FIG. 8A is an example of use of V2H-IF 20A with a bidirectional converter. The V2H-IF20A shown in FIG. 8A consists of a charging/discharging device EVPS10 having the EV charging/discharging interface standard "V2H", an EV having the EV charging/discharging interface standard "V2H", and a unique charging/discharging interface standard. and a bidirectional DCDC converter 20a that internally performs voltage adjustment between the ESS 30 and the storage battery inside the EV, and bidirectionally The EV can be directly charged via the DCDC converter 20a, and the ESS 30 can be directly charged with electric power from the EV via the bi-directional DCDC converter 20a.

FIG. 8B is an example of use of the V2H-IF 20B with the DC-AC converter 20b. The V2H-IF20B shown in FIG. 8B includes a charging/discharging device EVPS10 having the EV charging/discharging interface standard “V2H”, an EV having the EV charging/discharging interface standard “V2H”, and a unique charging/discharging interface standard. has a function of mutually converting the interfaces of the power storage device ESS30, and has a DCAC converter 20b that converts the storage battery power inside the ESS30 or the EV into AC power, and the power of the SS30 or the storage battery power inside the EV can be output to household AC power supply input equipment via the DCAC converter 20b.

FIG. 8(C) is an example of use of the V2H-IF 20C equipped with the charger 20c. The V2H-IF20C shown in FIG. 8C includes a charging/discharging device EVPS10 having the EV charging/discharging interface standard “V2H”, an EV having the EV charging/discharging interface standard “V2H”, and a unique charging/discharging interface standard. ESS30 having a function of mutually converting the interfaces of the power storage device ESS30 having a It has a charger (MPPT charger) 20c for charging. For example, the MPPT charger 20c can be used to charge the ESS 30 with DC power supplied from a solar panel. Further, for example, the EV can be charged using the MPPT charger 20c with DC power supplied from a solar panel.

[Third embodiment]
Next, a power storage interface conversion device, a power storage control method, a power storage control program, and a storage medium according to a third embodiment of the present invention will be described.
The power storage interface conversion device of the third embodiment of the present invention is used in an intelligent power storage system.
The intelligent power storage system includes a bi-directional DC-DC converter function, a bi-directional DC-AC converter function, a charge/discharge device, an EVPS charging function, an MPPT charger, a power storage function, a circuit switching function, and cloud-based monitoring, measurement, and control functions. have.

As a result, the intelligent power storage system can store the DC power supplied from the solar panel and the DC power supplied from the EV, convert the stored DC power into AC power, and link it to the domestic grid. be. The intelligent power storage system can also charge an EV with stored power. Furthermore, the intelligent power storage system can convert AC power supplied from a home grid into DC power and store it, or charge an EV. An intelligent power storage system incorporates, for example, an ESS. The domestic grid connected to the intelligent energy storage system is also connected to the external power grid.

Since the intelligent power storage system has cloud-based monitoring, measurement, control functions, etc., it is possible to control power supply and demand in a plurality of home systems, that is, systems within a predetermined area. In this case, the electrical circuit for power supply and demand control enables distribution of power using EVs as well as the power system connected to each home. In addition, it is possible to efficiently utilize power generated by power generation facilities such as solar panels in the area. Therefore, it is possible to construct a smart power supply and demand system within a region that does not rely solely on the transmission of large amounts of power from long-distance large-scale power plants. This will lead to effective use of small-scale power generation facilities in the region, enabling more detailed power supply and demand management. Therefore, the intelligent power storage system will effectively distribute surplus power, make effective use of small- and medium-scale power generation facilities, and respond to risks such as power shortages in times of tight power demand and emergencies. It contributes to stabilization.

The power storage interface conversion device, power storage control method, and power storage control program according to the embodiments of the present invention have been described above. These are examples of control programs, and the present invention is not limited to these, and can be equally applied to other embodiments, and some of these embodiments are omitted or added , can be changed, and aspects of each embodiment can be combined.

10 ... Electric Vehicle Charging and Discharging Device (EVPS)
REFERENCE SIGNS LIST 11: charge/discharge connector 12: bidirectional inverter 13: switch 14: power control device 14a: control unit 14b: communication unit 20: power storage interface converter (V2H-IF)
21 ... connector 22 ... power supply unit 23 ... switch 24 ... voltage detection unit 25 ... temperature detection unit 26 ... current detection unit 27 ... switch 28 ... charge/discharge control unit 28a ... control units 28b, 28c ... communication unit 30 ... power storage device ( ESS)
REFERENCE SIGNS LIST 31: battery section 32: charge/discharge interface section 32a: battery management unit 32b: voltage detection section 32c: temperature detection section 32d: current detection section 32e: communication section

Claims (3)

a charging/discharging device connected to an AC power supply system, having a first standard, and capable of charging/discharging a power storage device of the first standard;
a power storage device having a second standard different from the first standard;
can connect to
converting between the first standard and the second standard;
A power storage interface conversion device for converting information relating to charging/discharging communicated between the charging/discharging device and the power storage device having the second standard into information corresponding to each standard. a step of charging and discharging a power storage device that is connected to an AC power supply system, has a first standard, and meets the first standard;
charging and discharging a power storage device having a second standard different from the first standard;
a step of converting information on charging/discharging communicated between the charging/discharging device and the power storage device having the second standard into information corresponding to each standard;
A power storage control method, comprising: 3. A power storage control program, characterized in that each step in the power storage control method of claim 2 is executed by a computer.

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