Power supply systems and power conditioners

Abstract

To provide a technology capable of improving expandability of a V2H (Vehicle to Home) system coping with simultaneous use of a plurality of EVs and simplifying the system.SOLUTION: A power supply system 1 interconnecting with a power system 50 and capable of supplying supply power supplied from the power system as charge power to an EV 30, EV 31 as at lease one or more portable storage batteries connected through charging / discharging cables 30a, 31a comprises: a first power converter (INV12) for converting DC power supplied to a DC bus 16 to AC power and outputting the AC power to the power system; a second power converter (isolated bidirectional DC / DC converter 11) for converting voltage of DC power discharged from the EV 30 via the charging / discharging cable and outputting the converted voltage to the DC bus; and a third power converter (DD unit 20) for converting voltage of DC power discharged from the EV 31 via the charging / discharging cable and outputting the converted voltage to crossover wiring.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a power supply system and a power converter for so-called V2H (Vehicle to Home). Regarding the conditioner. [Background technology]

[0002] In recent years, vehicles such as EVs (Electric Vehicles), HVs (Hybrid Vehicles), PHVs (Plug-in Hybrid Vehicles), and FCVs (Fuel Cell Vehicles) that are equipped with storage batteries or fuel cells and can supply electric power from an external source have become popular. are rapidly becoming more and more popular. EVs and PHVs have a charging interface, which allows them to be charged via a charging cable from a charging device outside the vehicle. One example of a standard for such charging is the CHAdeMO standard, which enables high-speed charging using DC power.

[0003] In addition, the so-called V2H (Vehicle to Home) system, which connects the storage batteries installed in these vehicles to the electrical systems of facilities such as homes to enable two-way power supply, and the in-vehicle A V2L (Vehicle to Load) system that enables power supply to general household electrical appliances from a storage battery Systems such as these are becoming more widespread, and demand for them is increasing. For example, Patent Document 1 discloses a power supply system that is equipped with distributed power sources such as storage batteries and solar cells, and is also connected to a commercial power grid, and that enables power supply to EVs and PHVs. Guidelines for V2H and other systems include the "Guidelines for Charging and Discharging Systems for Electric Vehicles." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-122885 A Summary of the Invention [Problem to be solved by the invention]

[0005] As shown in Fig. 9, the V2H system includes a V2H power conditioner 310, and bidirectional power supply is performed between the EV 301, etc., and a commercial power system (system 302) or a storage battery system (standalone 303) constituting a distributed power source via the power conditioner. The V2H power conditioner 310 is connected to a commercial power system interconnected through a power distribution facility (not shown) and a distributed power source during stand-alone operation, and is connected to the EV 301, etc. via a charge / discharge cable 301a conforming to the CHAdeMO standard or the like. The V2H power conditioner 310 includes an insulated bidirectional DC / DC converter 311 and an inverter (INV 312) that performs bidirectional power conversion, which are mutually connected via a DC bus 316, provided in a housing, and performs power conversion that enables bidirectional power supply based on control instructions from a DD control unit 313 and an INV control unit 315, respectively. Based on a control instruction from the INV control unit 315, the INV 312 converts commercial power (AC power) supplied from the grid 302 or the storage battery system (stand-alone 303) during independent operation into DC power and outputs it to the DC bus 316, and also converts DC power supplied from the isolated bidirectional DC / DC converter 311 to the DC bus 316 into commercial power and outputs it to the grid 302 side or a load in the facility. The isolated bidirectional DC / DC converter 311 performs voltage conversion of the DC power supplied to the DC bus 316 based on a control instruction from the DD control unit 313, charges the storage battery of the EV 301 etc. connected to the charge / discharge cable 301a, and performs voltage conversion of the DC power discharged from the storage battery of the EV 301 etc. and outputs it to the DC bus 316.

[0006] As EVs become more widespread, it is expected that second and third EVs will also be introduced. When multiple EVs are introduced, a V2H power conditioner 310 as shown in FIG. Since only one vehicle's worth of power can be supplied from an EV to a facility through the system, and high-speed charging using CHAdeMO, etc. can only be done one vehicle at a time, it is expected that a new V2H power conditioner 310 will be added. The addition of the V2H power conditioner 310 will enable power supply from multiple EVs, etc., and high-speed charging using CHAdeMO, etc. to multiple EVs, etc. will become possible, which is expected to improve convenience.

[0007] However, for example, when two V2H power conditioners 310 simultaneously receive power from EVs, etc., connected to each of them to perform load and grid connection of the facility, it is necessary to add control to enable parallel operation by connecting each power conditioner with a specified communication line. In addition, the amount of power supplied from EVs, etc., connected to each power conditioner is different. For this reason, it is required to perform load and grid connection of the facility according to the amount of power supplied from each EV, etc., which makes inverter control complicated and requires high-speed processing.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide technology that can increase the scalability and simplify a V2H system that can support the simultaneous use of multiple EVs. [Means for solving the problem]

[0009] One aspect of the disclosed technique for solving the above problem is to A power supply system that is connected to a power grid and is capable of supplying power supplied from the power grid as charging power to at least one or more portable storage batteries connected via a charging / discharging cable, a first power converter that converts supply power supplied from the power system into DC power and outputs the DC power to a DC bus, and also converts the DC power supplied to the DC bus into AC power and outputs the AC power to the power system; a second power converter connected to the DC bus, converting a voltage of DC power input from the DC bus to a predetermined voltage, outputting the voltage to a charge / discharge cable to which a first portable storage battery is connected, and charging the first portable storage battery via the charge / discharge cable, and converting the voltage of DC power discharged from the first portable storage battery via the charge / discharge cable and outputting the voltage to the DC bus; a third power converter connected to a connection end between the DC bus and the second power converter via a jumper wiring, converting a voltage of DC power input from the jumper wiring to a predetermined voltage, outputting the voltage to a charge / discharge cable to which a second portable storage battery is connected, charging the second portable storage battery via the charge / discharge cable, and converting the voltage of DC power discharged from the second portable storage battery via the charge / discharge cable, and outputting the voltage to the jumper wiring; The present invention is characterized by comprising:

[0010] This allows the power supply system to construct a V2H system #1 capable of charging and discharging a first EV 30, which is a first portable storage battery, via a V2H power conditioner 10 including a bidirectional inverter (INV 12) which is a first power converter and an isolated bidirectional DC / DC converter 11 which is a second power converter. The bidirectional inverter (INV 12) converts commercial power supplied from a power system 50 into DC power and outputs it to a DC bus 16 which is a DC bus to which the isolated bidirectional DC / DC converter 11 is connected. The isolated bidirectional DC / DC converter 11 performs voltage conversion based on the DC power output to the DC bus 16, generates a predetermined voltage corresponding to the CHAdeMO standard, and supplies it to an EV 30 (a vehicle capable of supplying power from an external source, such as an EV, a PHV, or an FCV) connected to a charge / discharge cable 30a. The isolated bidirectional DC / DC converter 11 also performs voltage conversion of the DC power discharged from the EV 30 connected to the charge / discharge cable 30a, and outputs it to the DC bus 16. The bidirectional inverter (INV12) converts the DC power output to the DC bus 16 into AC power to supply the system It can be output to the control side. In addition, the power supply system 1 can configure a V2H system #2 capable of charging and discharging a second EV 31, which is a second portable storage battery, using a DD unit 20, which is a third power converter connected to the connection end between the DC bus 16 and the insulated bidirectional DC / DC converter 11 via a DC-Link 17 and a DC-BUS 18, which are jumper wiring. The DD unit 20 can charge the EV 31 connected to the charge / discharge cable 31a based on the DC power supplied via the jumper wiring, convert the voltage of the DC power discharged from the EV 31, and output it to the DC bus 16 via the jumper wiring. In the power supply system 1, the bidirectional inverter (INV 12), which is the first power converter, can be shared by the insulated bidirectional DC / DC converter 11, which is the second power converter, and the DD unit 20, which is the third power converter, so that the components related to the inverter in the second and subsequent V2H systems can be simplified. As a result, it is expected that the installation costs and maintenance costs for the second and subsequent V2H systems can be reduced. Furthermore, by configuring the DD unit 20 to be compatible with two-wheeled electric vehicles such as electric motorcycles and electric scooters equipped with storage batteries, it is possible to provide users with appropriate variations according to the type of EV, etc.

[0011] In addition, in one embodiment of the disclosed technology, The second power converter and the third power converter may be connected to each other via a predetermined communication line, and the third power converter may acquire information regarding the charging power of the second portable storage battery via a charge / discharge cable to which the second portable storage battery is connected and notify the second power converter of the information regarding the charging power acquired from the second portable storage battery via the predetermined communication line, and the second power converter may acquire information regarding a maximum dischargeable power of the first portable storage battery via a charge / discharge cable to which the first portable storage battery is connected, and charge the second portable storage battery connected to the third power converter via the charge / discharge cable within a range not exceeding the maximum dischargeable power of the first portable storage battery, based on the information regarding the charging power of the second portable storage battery and the information regarding the maximum dischargeable power of the first portable storage battery notified via the communication line.

[0012] This enables charging and discharging between the first EV30 introduced and the second EV31 introduced between the isolated bidirectional DC / DC converter 11 as the second power converter and the DD unit 20 as the third power converter, without going through the bidirectional inverter (INV12) as the first power converter. Because charging and discharging between EVs is possible via the jumper wiring without going through the bidirectional inverter (INV12), the utilization efficiency of stored power can be improved without increasing the speed or complexity of processing.

[0013] Furthermore, in one form of the disclosed technology, the first power converter, the second power converter, and the third power converter may each be housed in an individual housing, and an input / output terminal of DC power of the first power converter and an input / output terminal of DC power of the second power converter may be connected via a first jumper wiring, and an input / output terminal of the second power converter and an input / output terminal of DC power of the third power converter may be connected via a second jumper wiring.

[0014] As a result, as EVs become more widespread, it will become possible for a second or third EV to be introduced in an individual household, or multiple EB (Electric Bike) charging stations to be set up in commercial facilities (e.g. For example, this system can be used for electric two-wheeled vehicles such as electric motorcycles and electric scooters, and it will be possible to suppress the increase in facility costs and the complexity of installation work that accompanies expansion. It is expected that the inverter unit will be made smaller, the number of wires between units will be reduced, and installation work will be simplified.

[0015] In addition, another aspect of the disclosed technology is A power supply system that is connected to a power system and can supply power from the power system as charging power to at least one portable storage battery connected via a charging / discharging cable. A power conditioner provided in the system, The power conditioner comprises: a first power converter that converts supply power supplied from the power system into DC power and outputs the DC power to a DC bus, and also converts the DC power supplied to the DC bus into AC power and outputs the AC power to the power system; a second power converter connected to the DC bus, converting a voltage of DC power input from the DC bus to a predetermined voltage, outputting the voltage to a charge / discharge cable to which a first portable storage battery is connected, and charging the first portable storage battery via the charge / discharge cable, and converting the voltage of DC power discharged from the first portable storage battery via the charge / discharge cable and outputting the voltage to the DC bus; a connection end between the DC bus and the second power converter is processed so as to be connectable via a jumper wiring to a third power converter capable of charging and discharging the second portable storage battery via a charge / discharge cable to which a second portable storage battery is connected, the third power converter being provided externally; It is characterized by:

[0016] In this configuration, the V2H power conditioner 10 constituting the first V2H in the power supply system can be configured to be connectable to the DD unit 20, which is a third power converter capable of charging and discharging the second and subsequent EVs, improving scalability. In the V2H system #1 that supports the introduction of the first EV, the V2H system #2 that supports the introduction of the second and subsequent EVs can be easily constructed by connecting the DD unit 20, which is a third power converter, to the V2H power conditioner 10 via crossover wiring. This makes it possible to suppress increases in equipment costs and complex construction work that accompany expansion. Effect of the Invention

[0017] The present invention provides technology that can increase the scalability and simplify a V2H system that can accommodate the simultaneous use of multiple EVs. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a block diagram illustrating a configuration of a V2H system including two V2H power conditioners in a comparative example. [Diagram 2] FIG. 1 is a block diagram illustrating charging and discharging between EVs in a V2H system in a comparative example. [Diagram 3]1 is a block diagram showing a schematic configuration of a power supply system according to an embodiment of the present invention. [Figure 4] 2 is a diagram illustrating an example of a hardware configuration of a DD control unit according to an embodiment of the present invention. [Diagram 5] FIG. 2 is an explanatory diagram illustrating simultaneous charging and use of the power supply system according to the embodiment of the present invention. [Figure 6] FIG. 2 is an explanatory diagram illustrating simultaneous discharge utilization in a power supply system according to an embodiment of the present invention. [Figure 7] FIG. 2 is an explanatory diagram for explaining charging and discharging between EVs in the power supply system according to the embodiment of the present invention. [Figure 8] FIG. 13 is a block diagram showing a schematic configuration of a power supply system according to a modified example of the present invention. [Figure 9] FIG. 1 is a block diagram illustrating a configuration of a V2H system in a conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [Application example] Hereinafter, application examples of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing a schematic configuration of a power supply system 1 according to an application example of the present invention. The power supply system 1 in this application example includes a V2H system #1 and a V2H system #2, and constitutes a V2H system capable of using portable storage batteries mounted on a plurality of EVs, etc. The V2H system #1 is a V2H power conditioner system for EVs 30, etc., and the EVs 30, etc. include vehicles that can be supplied with power from outside, such as HVs, PHVs, and FCVs, that comply with the CHAdeMO standard, which enables high-speed charging with DC power. The V2H power conditioner 10 of the V2H system #1 is connected to a commercial power system (system 50) and a storage battery system that constitutes a distributed power source during autonomous operation and a load in a facility (autonomous 40), and bidirectional power supply between the EVs 30, etc. and the system 50 or the autonomous 40 is possible. The V2H power conditioner 10 of the V2H system #1 has a parallel operation function 13a in the DD control unit 13 as a functional configuration capable of accommodating a second, third EV, etc., and has the expandability to supply DC power via a DC-Link 17 between the V2H system #2 connected via the communication network N1.

[0020] The V2H system #2 according to this application example includes an EV 31 introduced as a second EV or the like, and a DD unit 20 limited in configuration for charging and discharging the EV 31 connected via a charge / discharge cable 31a conforming to the CHAdeMO standard or the like. The DD unit 20 includes an insulated bidirectional DC / DC converter 21, a DD control unit 23, and a power supply 24 in the same housing, that is, is configured with components other than those related to the inverter of the V2H power conditioner 10 (INV 12, INV control unit 15, DC bus 16, etc.). The DD control unit 23 is provided with a parallel operation function 23a.

[0021] In the V2H system #2 according to this application example, the isolated bidirectional DC / DC converter 21 of the DD unit 20 is configured to be connectable later to a connection terminal to which the DC bus 16 of the isolated bidirectional DC / DC converter 11 is connected via a DC-Link 17. That is, one end of the DC-Link 17 is connected to a connection terminal to which the DC bus 16 and the isolated bidirectional DC / DC converter 11 are connected, and the other end of the DC-Link 17 is connected to an output end that outputs DC power of the isolated bidirectional DC / DC converter 21 of the DD unit 20.

[0022] 5 to 7, the insulated bidirectional DC / DC converter 21 performs voltage conversion of the DC power supplied via the DC-Link 17 based on a control instruction from the DD control unit 23, and charges the storage battery of the second EV 31 etc. connected to the charge / discharge cable 30a. Similarly, the insulated bidirectional DC / DC converter 21 performs voltage conversion of the DC power discharged from the storage battery of the second EV 31 etc., and outputs it to the DC-Link 17.

[0023] In the power supply system 1 according to this application example, when a second or subsequent EV is introduced, a V2H system can be constructed with the DD unit 20 limited to a configuration related to charging and discharging the EV, so that the components related to the inverter can be simplified compared to the case where a dedicated power conditioner is provided. By simplifying the components of the V2H system, it is expected that the installation cost and maintenance cost for the second or subsequent V2H systems can be reduced. In addition, by configuring the DD unit 20 to be compatible with electric two-wheeled vehicles such as electric motorcycles and electric scooters equipped with storage batteries, an appropriate V2H system can be constructed according to the variation of mobile vehicles including portable storage batteries such as EVs.

[0024] Example 1 Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings.

[0025] First, as a comparative example, a V2H system 300 equipped with two V2H power conditioners 310 is shown in Fig. 1. In Fig. 1, system #1 enclosed by a thin dashed line frame is a V2H power conditioner system for a first EV or the like installed in a facility or the like, and system #2 is a V2H power conditioner system for a second EV or the like. This corresponds to the V2H system shown in FIG. 9. The grid 302 in system #1 and the grid 302 in system #2 are connected via a distribution board (not shown), and the same is true for the independent power source 303, which is a distributed power source (e.g., a storage battery system) during independent operation. The V2H power conditioners 310 provided in systems #1 and #2 are configured to be mutually connected via a communication network N such as a controller area network (CAN) or RS-485. In addition, a parallel operation function 315a is added to the INV control unit 315 of each V2H power conditioner to enable simultaneous use of EVs 301, etc. connected to each system based on information transmitted and received through the communication network N. The addition of the parallel operation function 315a enables each V2H power conditioner to stably use the power supplied from EVs 301, etc. connected to each system by mutually notifying each other of control information for inverter control, insulated bidirectional DC / DC converter 311 control, etc. via the communication network N when EVs 301, etc. are used simultaneously.

[0026] For example, assume that parallel operation is performed with the V2H power conditioner 310 of system #1 as the master and the V2H power conditioner 310 of system #2 as the slave, and power discharged from the EVs 301, etc., is supplied to loads in the facility. The INV control unit 315 on the master side requests notification of the amount of dischargeable power on the slave side connected to the communication network N, for example, via the parallel operation function 315a. The V2H power conditioner 310 on the slave side acquires the amount of dischargeable storage power from the EVs 301, etc. connected to the system #2, for example, via the DD control unit 313. The V2H power conditioner 310 on the slave side acquires the charging state (e.g., SOC (State Of Charge)) of the storage battery, for example, via the charge / discharge ECU of the EVs 301, etc. connected to the charge / discharge cable 301a. Then, the V2H power conditioner on the slave side 310 transmits the acquired charging state to the master side V2H power conditioner 310.

[0027] Similarly, in the master-side V2H power conditioner 310, the amount of dischargeable stored power is obtained from the EVs 301 etc. connected to the system #1 via the DD control unit 313. In the parallel operation function 315a of the master-side V2H power conditioner 310, the power that can be supplied to the load side is allocated based on, for example, the charge state of the storage battery in the master-side EVs 301 etc., the charge state of the storage battery on the slave side, and the power consumption of the load, etc.

[0028] After the power allocation, the master-side V2H power conditioner 310 notifies the slave-side allocation via the communication network N. Then, the master-side V2H power conditioner 310 controls INV312 using the master-side allocation as an output target after DC / AC conversion, converts the discharged power from the master-side EVs 301, etc., and supplies it to the load (FIG. 1, arrow A1). The same is true for the slave-side V2H power conditioner 310, where INV312 is controlled using the slave-side allocation as an output target after DC / AC conversion, and power is supplied to the load based on the power discharged from the slave-side EVs 301, etc. (FIG. 1, arrow A2).

[0029] In this way, by adding a parallel operation function 315a to each V2H power conditioner 310 and connecting them via the communication network N, the V2H power conditioners 310 of systems #1 and #2 can be linked, enabling simultaneous use of the supply power according to the charging state of the EVs 301, etc. connected to each system. However, as described above, the processing for linking them becomes complicated. Furthermore, in each INV control unit 315 during parallel operation, sensor values ​​detected by power sensors (current sensors, voltage sensors) not shown provided between the V2H power conditioner 310 and the load, and power sensors provided on the DC bus 316, etc. are acquired at regular intervals, and control is performed so that the output power of the INVs 312 is stabilized. Furthermore, In order to deal with load fluctuations, for example, various sensor information including the above-mentioned power sensor and control information including control instructions to INV312 are transmitted and received via the communication network N, which results in faster processing related to the INV control unit 315 and increased burden.

[0030] Simultaneous use by two EVs 301 etc. may involve using power supplied from one EV 301 etc. to charge the other EV 301 etc., as shown in Fig. 2. When the stored power of the EV 301 etc. connected to system #1 is used to charge the EV 301 etc. connected to system #2, as shown in Fig. 2, power is supplied from system #1 to system #2 following the route of arrow A3. That is, in a V2H system 300 having two V2H power conditioners 310, power for charging the EV 301 etc. connected to system #2 is supplied from the autonomous 303 side of system #1 connected via a distribution board or the like to the autonomous 303 side of system #2.

[0031] As in FIG. 1, a parallel operation is performed in which the V2H power conditioner 310 of system #1, which is connected to the system #2 via the communication network N, serves as a master and the V2H power conditioner 310 of system #2 serves as a slave. When the EV 301 of system #1 charges the EV 301 of system #2, for example, the INV control unit 315 on the master side requests notification of the charging state of the storage battery in the EV 301 on the slave side connected to the communication network N via the parallel operation function 315a. The V2H power conditioner 310 on the slave side acquires, for example, the charging state of the storage battery from the EV 301 connected to the system #2 via the DD control unit 313. Then, the V2H power conditioner 310 on the slave side transmits the acquired charging state to the V2H power conditioner 310 on the master side.

[0032] Furthermore, the master-side V2H power conditioner 310 acquires the state of charge of the storage batteries from the EVs 301 etc. connected to system #1 via the DD control unit 313. The parallel operation function 315a of the master-side V2H power conditioner 310 allocates the power that can be supplied to the EVs 301 of system #2 based on, for example, the state of charge of the storage batteries in the EVs 301 etc. on the master side and the state of charge of the storage batteries on the slave side.

[0033] After the power allocation, the master side V2H power conditioner 310 controls the INV 312 with the chargeable power for the EV 301 of the system #2 as the output target after DC / AC conversion, converts the discharged power from the EV 301 etc. on the master side, and outputs it to the autonomous 303 side of the system #1. The power output to the autonomous 303 side of the system #1 is input to the slave side V2H power conditioner 310 via a wiring path between the autonomous 303 on the system #2 side and the system #2 side through a wiring path such as a distribution board. The slave side V2H power conditioner 310 controls the INV 312, AC / DC converts the power supplied from the autonomous 303 side of the system #1, and outputs it to the DC bus 316. The isolated bidirectional DC / DC converter 311 of the system #2 performs voltage conversion of the DC power supplied to the DC bus 316 according to a control instruction from the DD control unit 313, and outputs it to the EV 301 connected to the charge / discharge cable 301a on the system #2 side.

[0034] Even in a configuration in which power supplied from one EV301, etc. is used to charge the other EV301, etc., adding a parallel operation function 315a and connecting via a communication network N allows the V2H power conditioners 310 of systems #1 and #2 to link together and use the power of the EV301, etc. appropriately. However, in this configuration, the processing related to charging and discharging between the EV301 becomes more complicated. And, in order to stabilize the output power output from the INV312 of system #1 and the DC power output from the INV312 of system #2 to the DC bus 316, the control processing using the sensor information of various sensors becomes faster. Also, the power of the EV301 connected to system #1 is supplied to the insulated bidirectional DC / After DC voltage conversion by DC converter 311, the voltage is converted from DC to AC by INV312 and output to system #2, where further AC / DC conversion is performed by INV312 and DC voltage conversion is performed by isolated bidirectional DC / DC converter 311. For this reason, it is inevitable that the efficiency of power usage by EV301 connected to system #1 will decrease.

[0035] <System Overview> FIG. 3 is a block diagram showing a schematic configuration of a power supply system 1 according to the present embodiment. The power supply system 1 according to the present embodiment includes a V2H system #1 and a V2H system #2, and constitutes a V2H system capable of using portable storage batteries mounted on a plurality of EVs, etc. In FIG. 3, the V2H system #1 enclosed by a thin dashed line frame is a V2H power conditioner system for a first EV 30, etc. installed in a facility, etc. The EV 30, etc. includes vehicles that can supply power from outside, such as HVs, PHVs, and FCVs, that comply with the CHAdeMO standard, etc., that enables high-speed charging with DC power. In addition, the V2H system #2 enclosed by a thin dashed line frame is a system that is added when a second EV, etc. is introduced, and in this embodiment, the V2H system #1 and the V2H system #2 are configured to be mutually connectable via a communication network N1, such as a CAN, for example.

[0036] The V2H system #1 includes a V2H power conditioner 10, and is connected to an EV 30 or the like via a charge / discharge cable 30a conforming to the CHAdeMO standard or the like. The V2H power conditioner 10 is also connected to, for example, a commercial power system (system 50) interconnected through a power distribution facility (not shown) and a storage battery system (single-unit 40) constituting a distributed power source during independent operation, enabling bidirectional power supply between the EV 30 or the like and the system 50 or the single-unit 40. In the following, the single-unit 40 is described as a storage battery system constituting a distributed power source during independent operation, but the distributed power source may include a solar power generation system, a power generation system using natural energy such as wind power or hydraulic power, or a private power generation system using fuel. The single-unit 40 includes loads such as home appliances installed in a facility or the like. In this embodiment, the "system 50" corresponds to an example of a "power system", and the "EV 30" corresponds to an example of a "first portable storage battery".

[0037] The V2H power conditioner 10 includes an insulated bidirectional DC / DC converter 11 and a bidirectional inverter (INV 12) connected to each other via a DC bus 16 in the same housing. The V2H power conditioner 10 also includes a DD control unit 13 and an INV control unit 15 as control functions during power conversion in the same housing, and includes a built-in battery for driving the DD control unit 13 and the INV control unit 15 during independent operation, or a power supply 14 configured with a circuit that enables power supply from the outside. The V2H power conditioner 10 is provided with various sensors including a power sensor (current sensor, voltage sensor) (not shown) provided in the power wiring between the V2H power conditioner 10 and the grid 50 and a power sensor provided in the DC bus 16, and these sensors are connected to the DD control unit 13 and the INV control unit 15 via wiring inside the housing.

[0038] The INV 12, which is a bidirectional inverter, converts commercial power (AC power) supplied from the grid 50 or the storage battery system (stand-alone 40) during stand-alone operation into DC power based on a control instruction from the INV control unit 15, and outputs the DC power to the DC bus 16. Similarly, the INV 12 converts DC power supplied from the isolated bidirectional DC / DC converter 11 to the DC bus 16 into commercial power, and outputs the commercial power to the grid 50 side or the stand-alone 40 side including the load in the facility. The isolated bidirectional DC / DC converter 11 performs voltage conversion of the DC power supplied to the DC bus 16 based on a control instruction from the DD control unit 13, and charges the storage battery of the EV 30 or the like connected to the charge / discharge cable 30a. Similarly, the isolated bidirectional DC / DC converter 11 performs voltage conversion of the DC power discharged from the storage battery of the EV 30 or the like, and outputs the voltage to the DC bus 16. The INV control unit 15 and the DD control unit 13 each control the respective power sources connected via the internal wiring of the V2H power conditioner 10. The control circuit periodically acquires sensor information related to control from various sensors, generates control instructions based on the sensor information, etc., and controls the INV 12 and the isolated bidirectional DC / DC converter 11 to output stable power. In this embodiment, the "INV 12" corresponds to an example of a "first power converter", and the "isolated bidirectional DC / DC converter 11" is an example of a "second power converter". However, the "first power converter" may be configured to include the "INV control unit 15" and the "power source 14", and the "second power converter" may be configured to include the "DD control unit 13" and the "power source 14".

[0039] The V2H power conditioner 10 of the V2H system #1 according to this embodiment has a parallel operation function 13a in the DD control unit 13 as a functional configuration capable of handling a second, third EV, etc. The parallel operation function 13a is provided, for example, as a software program, and is stored in a memory or the like provided in the V2H power conditioner 10. The V2H power conditioner 10 has an expandability that allows DC power to be supplied via a DC-Link 17 to the V2H system #2 connected via a communication network N1. The V2H power conditioner 10 has an expandability that allows, for example, a DC bus 16 that connects the insulated bidirectional DC / DC converter 11 and the bidirectional inverter (INV12) to an insulated bidirectional DC / DC converter 21 of the V2H system #2 that is added in response to the introduction of a new EV to be connected via the DC-Link 17. An example of such expandability is a configuration in which a connection terminal of the isolated bidirectional DC / DC converter 11, to which the DC bus 16 and the isolated bidirectional DC / DC converter 11 are connected, can be connected to one end of the DC-Link 17 via a jumper wiring or the like. In the V2H power conditioner 10 of the V2H system #1 according to this embodiment, by providing such expandability, it becomes possible to later connect an isolated bidirectional DC / DC converter of an external system to which a new EV has been added via the DC-Link 17.

[0040] The V2H system #2 according to the present embodiment includes an EV 31 introduced as a second EV or the like, and a DD unit 20 limited in configuration related to charging and discharging the EV 31 connected via a charge / discharge cable 31a conforming to the CHAdeMO standard or the like. In the present embodiment, the DD unit 20 includes an isolated bidirectional DC / DC converter 21, a DD control unit 23, and a power supply 24 in the same housing, that is, is configured with components other than the components related to the inverter of the V2H power conditioner 10 (INV 12, INV control unit 15, DC bus 16, etc.). In the V2H system #2 according to the present embodiment, the isolated bidirectional DC / DC converter 21 of the DD unit 20 is configured to be connectable later via a DC-Link 17 to a connection terminal to which the DC bus 16 of the isolated bidirectional DC / DC converter 11 is connected. That is, one end of the DC-Link 17 is connected to a connection terminal to which the DC bus 16 and the insulated bidirectional DC / DC converter 11 are connected, and the other end is connected to an output end that outputs DC power of the insulated bidirectional DC / DC converter 21 of the DD unit 20. In this embodiment, the "DD unit 20" corresponds to an example of a "third power converter", and the "DC-Link" and a "DC-BUS 18" described later correspond to examples of a "transfer wiring". Also, the "EV31" corresponds to an example of a "second portable storage battery".

[0041] In the DD unit 20, the isolated bidirectional DC / DC converter 21, the DD control unit 23, and the power supply 24 are configured similarly to the isolated bidirectional DC / DC converter 11, the DD control unit 13, and the power supply 14 of the V2H power conditioner 10 included in the V2H system #1. That is, the power supply 24 is, for example, a built-in battery that drives the DD control unit 23 during independent operation, or a circuit that enables power supply from the outside, and the DD control unit 23 is provided with a parallel operation function 23a. The parallel operation function 23a is held in a memory or the like included in the DD unit 20. The DD unit 20 provides power conversion by the isolated bidirectional DC / DC converter 21 based on the DC power via the DC-Link 17 between the DD unit 20 and the V2H system #1 connected via the communication network N1.

[0042] The isolated bidirectional DC / DC converter 21 performs voltage conversion on the DC power supplied via the DC-Link 17 based on the control instruction from the DD control unit 23, and charges the battery such as the EV 31 connected to the charge / discharge cable 30a. Similarly, the isolated bidirectional DC / DC converter 21 performs voltage conversion on the DC power discharged from the battery such as the EV 31 and outputs it to the DC-Link 17. The DD control unit 23 periodically acquires information regarding the control of various sensors provided in the V2H power conditioner 10 via the communication network N1, generates a control instruction based on the sensor information and the like, and controls the isolated bidirectional DC / DC converter 11 to provide stable power supply.

[0043] Thus, in the power supply system 1 according to the present embodiment, when introducing the second and subsequent EVs, etc., the DD unit 20 limited to the configuration related to the charge / discharge of the EV can be used to construct the V2H system. Therefore, compared with the case of providing a dedicated power conditioner, it is possible to simplify the components related to the inverter. By simplifying the components of the V2H system, it is expected to reduce the installation cost and maintenance cost related to the second and subsequent V2H systems. In addition, by configuring the DD unit 20 to be compatible with, for example, electric two-wheel vehicles such as electric bicycles and electric scooters equipped with batteries, an appropriate V2H system can be constructed according to the variations of mobile vehicles including portable batteries such as EVs.

[0044] FIG. 4 is a diagram illustrating an example of a hardware configuration of the DD control unit 13 according to the present embodiment. As shown in FIG. 4, the DD control unit 13 is a computer including a processor 101, a main storage device 102, an auxiliary storage device 103, a communication IF 104, and an input / output IF 105, which are connected to each other by a connection bus 106. The main storage device 102 and the auxiliary storage device 103 are recording media that can be read by the DD control unit 13 and the like. The main storage device 102 and the auxiliary storage device 103 constitute the memory of the DD control unit 13. Each of the above components may be provided in a plurality of units, or some of the components may not be provided. Note that the INV control unit 15 of the V2H power conditioner 10 and the DD control unit 23 of the DD unit 20 are substantially realized with a configuration equivalent to the hardware configuration of the DD control unit 13, and therefore a description thereof will be omitted.

[0045] The processor 101 is a central processing unit that controls the entire DD control unit 13. The processor 101 is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). The program is executable in the working area of ​​the main memory 102, and the program is executed to control peripheral devices, thereby providing functions that meet a specific purpose. Note that some or all of the functions may be provided by a SoC (System on a Chip), an ASIC (Application Specific Integrated Circuit), a GPU (Graphics Processing Unit), etc. Similarly, some or all of the functions may be implemented using FPGAs (Field-Programmable Gate Arrays). ), a dedicated LSI (large scale integration) such as a numerical calculation processor, a vector processor, or an image processing processor, or other hardware circuits.

[0046] The main memory device 102 stores the programs executed by the processor 101, the data processed by the processor, etc. The main memory device 102 includes a flash memory, a RAM (Random Access Memory), and a ROM (Read Only Memory). The auxiliary memory device 103 stores various programs and various data in a readable and writable recording medium. The auxiliary memory device 103 stores, for example, an OS (Operating System), various programs, various tables, etc. The OS includes, for example, a communication interface program that transfers data with an external device, etc. connected via the communication IF 104. The external device, etc. is, for example, a computer provided in a DD unit, a V2H power conditioner, a PV (Photovoltaic) system, a storage battery system, etc. in another V2H system connected to the communication network N1. do.

[0047] The auxiliary storage device 103 is used as a storage area that supports the main storage device 102, and stores programs executed by the processor 101, data processed by the processor 101, etc. The auxiliary storage device 103 is a non-volatile semiconductor memory (flash memory, EPROM (Erasable Programmable Read Only Memory) The communication IF 104 connects the DD control unit 13 to the communication network N1. The communication IF 104 can be configured appropriately according to the connection method with the communication network N1. The input / output IF 105 is an interface for inputting and outputting data between the DD unit and the V2H power conditioner and devices connected to the DD unit and the V2H power conditioner through a wired or wireless interface. An input device such as an operation button, a key panel, a touch panel, or a microphone is connected to the input / output IF 105. The DD unit and the V2H power conditioner accept operation instructions from an operator who operates the input device through the input / output IF 105. In addition, the input / output IF 105 is connected to a display device such as an LCD, an EL panel, or an organic EL panel, and an output device such as a printer or a speaker. The DD unit and the V2H power conditioner output data and information processed by the processor 101, and data and information stored in the main storage device 102 and the auxiliary storage device 103 through the input / output IF 105.

[0048] <Operation when used simultaneously> (Using simultaneous charging) Next, the operation of the power supply system 1 according to the present embodiment when EVs and the like are used simultaneously will be described with reference to Figs. 5-7. Fig. 5 is a diagram for explaining the operation regarding simultaneous charging of the EV 30 in the V2H system #1 and the EV 31 in the V2H system #2. As shown in Fig. 5, the V2H power conditioner 10 in the V2H system #1 and the DD unit 20 in the V2H system #2 are connected to each other via a DC-Link 17 and a communication network N1. The connection terminal on the DC bus 16 side of the insulated bidirectional DC / DC converter 11 constituting the V2H power conditioner 10 and the terminal on the side to which DC power is supplied of the insulated bidirectional DC / DC converter 21 in the DD unit 20 are connected via a DC-Link 17. The same applies to Figs. 6 and 7 below. In Fig. 5, an arrow A4 indicates a path of power when the EV 30 in the V2H system #1 and the EV 31 in the V2H system #2 are simultaneously charged. In the charging operation, for example, simultaneous charging of EV 30 and EV 31 is provided based on commercial power supplied from grid 50 connected to the V2H system #1 side.

[0049] Regarding simultaneous charging of EVs 30 and 31 in the power supply system 1 according to the present embodiment, the V2H power conditioner 10 of the V2H system #1 performs power conversion based on the commercial power supplied from the grid 50 in the same manner as during standalone operation. That is, the INV control unit 15 of the V2H power conditioner 10 generates a control command related to simultaneous charging based on various sensor information including, for example, a power sensor (not shown) provided in the power wiring between the V2H power conditioner 10 and the grid 50 and a power sensor provided in the DC bus 16. The INV 12 of the V2H power conditioner 10 converts the commercial power supplied from the grid 50 into DC power based on the control command generated by the INV control unit 15 and outputs the DC power to the DC bus 16.

[0050] The insulated bidirectional DC / DC converter 11 of the V2H power conditioner 10 performs voltage conversion of the DC power supplied to the DC bus 16 based on a control instruction from the DD control unit 13, and outputs it to the charge / discharge cable 30a to which the EV 30 is connected. Also, in the V2H system #2, the insulated bidirectional DC / DC converter 21 constituting the DD unit 20 performs voltage conversion of the DC power supplied through the DC-Link 17 based on a control instruction from the DD control unit 23, and outputs it to the charge / discharge cable 31a to which the EV 31 is connected.

[0051] In this way, in the power supply system 1 according to the present embodiment, the EV 30 and the EV 31 can be simultaneously charged based on the commercial power supplied from the grid 50 by the same operation as that of the stand-alone operation of the V2H power conditioner 10 of the V2H system #1 provided when the first EV or the like is introduced. As shown in FIG. 1, compared to the case where two V2H power conditioners 310 are provided, for example, the inverter operation related to the INV 312 and the control processing related to the INV control unit 315 in the V2H power conditioner 310 of the system #2 can be simplified. Furthermore, since the inverter operation related to the INV 312 and the control processing related to the INV control unit 315 in the V2H power conditioner 310 of the system #2 are relatively omitted, the processing burden related to simultaneous charging can be reduced, and the cost related to the processing can be reduced.

[0052] (Using simultaneous discharge) Next, a discharging operation of the power supply system 1 according to the present embodiment when EVs and the like are used simultaneously will be described. Fig. 6 is a diagram for explaining the operation related to the simultaneous discharging of EV 30 in V2H system #1 and EV 31 in V2H system #2. In Fig. 6, arrow A5 indicates a path related to the use of power discharged simultaneously from EV 30 in V2H system #1 and EV 31 in V2H system #2. In the discharging operation, for example, DC power discharged simultaneously from EV 30 and EV 31 is supplied to a grid 50 connected to the V2H system #1 side, or to a load in a facility.

[0053] Even in the case of simultaneous discharge of EV 30 and EV 31 in the power supply system 1 according to the present embodiment, the V2H power conditioner 10 of the V2H system #1 operates in the same way as in standalone operation to supply power to the grid 50 or loads within the facility. For example, in the V2H system #1, the DD control unit 13 of the V2H power conditioner 10 acquires the charging state (e.g., SOC (State Of Charge)) of the storage battery, for example, through communication with the charge / discharge ECU of the EV 30 connected via the charge / discharge cable 30a, and controls the discharging from the EV. Based on control instructions from the DD control unit 13, the insulated bidirectional DC / DC converter 11 performs voltage conversion of the DC power supplied from the EV 30 via the charge / discharge cable 30a and outputs the converted power to the DC bus 16. The DD control unit 13 appropriately communicates with the charge / discharge ECU of the EV 30 via the charge / discharge cable 30a, appropriately generates control commands according to the charge state of the storage battery, and controls the insulated bidirectional DC / DC converter 11.

[0054] Similar control is performed in the V2H system #2. For example, the DD control unit 23 of the DD unit 20 acquires the charge state of the storage battery through communication with the charge / discharge ECU of the EV 31 connected through the charge / discharge cable 31a, and generates a control command for power supply by discharging from the EV. The insulated bidirectional DC / DC converter 21 performs voltage conversion of the DC power supplied from the EV 31 through the charge / discharge cable 31a based on the control command from the DD control unit 23, and outputs it to the DC-Link 17. The discharge power on the V2H system #2 side output to the DC-Link is output to the DC bus 16 of the V2H power conditioner 10 connected through the DC-Link. The DD control unit 23 of the V2H system #2 appropriately communicates with the charge / discharge ECU of the EV 31 through the charge / discharge cable 31a, generates a control command according to the charge state of the storage battery, and controls the insulated bidirectional DC / DC converter 21.

[0055] The INV control unit 15 of the V2H power conditioner 10 generates a control command for simultaneous discharge supplied from the EVs 30 and 31 based on various sensor information including, for example, a power sensor provided on the DC bus 16 and a power sensor provided on the power wiring between the DC bus 16 and the power grid 50. Based on the generated control command, the DC power supplied from EVs 30 and 31 to DC bus 16 is converted into AC power and output to grid 50, a load, etc. connected to V2H power conditioner 10.

[0056] In this way, even during simultaneous discharge, the power supply system 1 according to the present embodiment allows the use of power supplied from the EVs 30 and 31 by the same operation as when the V2H power conditioner 10 of the V2H system #1 installed when the first EV is introduced operates alone. As shown in FIG. 2, compared to the case where two V2H power conditioners 310 are installed, for example, cooperative control processing of inverter operation (DC / AC conversion) between the V2H power conditioners 310 of the systems #1 and #2 via the parallel operation function 315a is not required. Therefore, there is no risk of speeding up or complicating the processing related to parallel operation in the INV control units 315 of both V2H power conditioners 310. Even when multiple EVs are used simultaneously, the power supply system 1 according to the present embodiment allows operation while maintaining the processing function related to inverter operation of the V2H power conditioner 10 established when the first EV is introduced. The renovation costs associated with the introduction of a second EV and the maintenance costs including the second V2H system #2 will be relatively reduced.

[0057] (Use between EV and EV) Next, an operation of the power supply system 1 according to the present embodiment, in which the storage power of one EV or the like is used to charge a storage battery of an EV or the like connected to the other EV, will be described. FIG. 7 is a diagram for explaining simultaneous use in which the power discharged from the EV 30 of the V2H system #1 is supplied as charging power to the EV 31 of the V2H system #2. In FIG. 7, the arrow A6 indicates a path related to power use when the power discharged from the EV 30 of the V2H system #1 is used to charge the EV 31 of the V2H system #2. As shown in FIG. 7, in the power supply system 1 according to the present embodiment, power related to charging and discharging is used via the insulated bidirectional DC / DC converter 11 of the V2H system #1 and the insulated bidirectional DC / DC converter 21 of the V2H system #2, which are connected by the DC-Link 17. In this embodiment, the process related to power supply between the EV 30 and the EV 31 shown in FIG. 7 is provided via the parallel operation functions (13a, 23a) provided in the DD control unit 13 and the DD control unit 23, respectively.

[0058] In the V2H system #1, the EV 30 is connected to the V2H power conditioner 10 via a charge / discharge cable 30a, and in the V2H system #2, the EV 31 is connected to the DD unit 20 via a charge / discharge cable 31a. The V2H power conditioner 10 accepts operation instructions from the user regarding charging / discharging from the EV 30 to the EV 31 via an operation switch or the like provided on a housing or the like. The DD control unit 13 of the V2H power conditioner 10 acquires the maximum dischargeable power through communication with the charge / discharge ECU or the like of the EV 30 connected via the charge / discharge cable 30a conforming to the CHAdeMO standard or the like, and generates a control command regarding the discharge power from the EV. The insulated bidirectional DC / DC converter 11 performs voltage conversion of the DC power supplied from the EV 30 via the charge / discharge cable 30a based on the control command from the DD control unit 13, and outputs the converted power to the DC-Link 17.

[0059] The parallel operation function 13a of the DD control unit 13 requests the DD control unit 23 of the DD unit 20 connected via the communication network N1 to notify the DD control unit 23 of information indicating the charging state of the EV 31. The parallel operation function 23a of the DD control unit 23 acquires information indicating the charging state of the EV 31 through communication with the charge / discharge ECU of the EV 31 connected via a charge / discharge cable 31a conforming to the CHAdeMO standard or the like, and notifies the V2H power conditioner 10 of the information via the communication network N1. In addition, the insulated bidirectional DC / DC converter 21 of the DD unit 20 performs voltage conversion of the DC power supplied to the DC-Link 17 based on a control instruction from the DD control unit 23, and outputs the converted voltage to the EV 31 connected via the charge / discharge cable 31a. To exert effort.

[0060] The DD control unit 13 of the V2H power conditioner 10 and the DD control unit 23 of the DD unit 20 communicate and cooperate at regular intervals via the parallel operation function provided in each, and charge the EV31 within a range that does not exceed the maximum dischargeable power of the EV30.

[0061] The same applies to the case where power discharged from EV 31 in V2H system #2 is supplied as charging power to EV 30 in V2H system #1. The DD unit 20 receives an operation instruction from the user regarding charging / discharging from EV 31 to EV 30 via an operation switch or the like provided on a housing or the like, and acquires the maximum dischargeable power via communication with the charge / discharge ECU or the like of the EV 31 connected via the charge / discharge cable 31a, and generates a control command regarding the discharge power from the EV. The insulated bidirectional DC / DC converter 21 performs voltage conversion of the DC power supplied from EV 31 via the charge / discharge cable 31a based on the control instruction from the DD control unit 23, and outputs the converted power to DC-Link 17.

[0062] The parallel operation function 23a of the DD control unit 23 requests the DD control unit 13 of the V2H power conditioner 10 connected via the communication network N1 to notify the DD control unit 13 of information indicating the charging state of the EV 30. The parallel operation function 13a of the DD control unit 13 acquires information indicating the charging state of the EV 30 through communication with the charge / discharge ECU of the EV 30 connected via a charge / discharge cable 30a conforming to the CHAdeMO standard or the like, and notifies the DD unit 20 of the information via the communication network N1. Then, the insulated bidirectional DC / DC converter 11 of the V2H power conditioner 10 performs voltage conversion of the DC power supplied to the DC-Link 17 based on a control instruction from the DD control unit 13, and outputs the voltage conversion to the EV 30 connected via the charge / discharge cable 30a.

[0063] In this way, in the power supply system 1 according to the present embodiment, when the storage power of one EV or the like is used to charge the storage battery of the other EV or the like connected to the other EV, the charging power can be used without going through the INV 12 of the V2H power conditioner 10. As shown in Fig. 3, compared to the case where two V2H power conditioners 310 are provided, there is no need for coordinated control processing of inverter operation (DC / AC conversion) between the V2H power conditioners 310 of systems #1 and #2 via the parallel operation function 315a. Therefore, there is no risk of further speeding up and complicating the parallel operation processing in the INV control units 315 of both V2H power conditioners 310.

[0064] In addition, in the power supply system 1 according to the present embodiment, the use of electric power for charging and discharging is possible via the insulated bidirectional DC / DC converter 11 of the V2H system #1 and the insulated bidirectional DC / DC converter 21 of the V2H system #2, which are connected by the DC-Link 17. For this reason, as shown in Fig. 3, the electric power of the EV 30 connected to the system #1 is not output to the system #2 after DC / AC conversion by the INV 12 of the system #1, nor is it supplied to the EV 31 of the system #2 via AC / DC conversion by the INV 12 in the system #2. In the power supply system 1 according to the present embodiment, it is possible to provide charging and discharging between EVs with relatively improved efficiency of power use between the first V2H system #1 and the second V2H system #2.

[0065] <Modification> It is possible to assume that the configuration of the V2H power conditioner 10 described in the first embodiment is separated into an inverter unit and a DD unit, each of which is housed in an individual housing, and a V2H system is configured by combining the separated inverter unit and DD unit. FIG. 8 is a block diagram showing a schematic configuration of a power supply system 1a according to a modified example. The power supply system 1a according to the modified example includes an inverter unit 70, a DD unit 20#1, and a D The V2H system includes a D unit 20#2 and a DD unit 20#3. The inverter unit 70 is a unit that includes, for example, the INV 12, which is a bidirectional inverter, the power supply 14, and the INV control unit 15 of the V2H power conditioner 10 shown in Fig. 3 in the same housing. The DD units 20#1 to 20#3 are configured similarly to the DD unit shown in Fig. 3. The DD units 20#2 and 20#3 are charge / discharge units corresponding to the second EV 31 and the third EV 32, respectively.

[0066] The inverter unit 70 and the DD unit 20#1 are connected via, for example, a DC-BUS 18, and are configured to provide the same functions as the V2H power conditioner 10 shown in FIG. 3. That is, the DD unit 20#1 is connected to the EV 30 and the like via a charge / discharge cable 30a conforming to the CHAdeMO standard and the like, and the inverter unit 70 is connected to a commercial power system (system 30) interconnected through a power distribution facility (not shown), a storage battery system constituting a distributed power source during independent operation, and a load (independent 40) in the facility. Then, the inverter unit 70 and the DD unit 20#1, which are separated into separate housings, are connected via a DC-BUS 18, which is a crossover wiring, thereby enabling bidirectional power supply between the EV 30 and the system 30 or the independent 40. That is, even in the form of the power supply system 1a according to the modified example, the functions of the V2H system #1 shown in FIG. 3 can be provided.

[0067] In the power supply system 1a according to the modified example, the DD unit 20#1 and the DD unit 20#2, and the DD unit 20#2 and the DD unit 20#3 are configured to be connected to each other via a DC-BUS 18, which is a jumper wiring. The DD units 20#1 to 20#3 are configured to be connected to each other via a communication network N1 such as a CAN.

[0068] In the DD unit 20#2 connected to the DD unit 20#1 via the DC-BUS 18, it is possible to use electric power for charging and discharging the EV 31 connected via the charge / discharge cable 31a, in the same manner as in the V2H system #2 shown in FIG. 3. Similarly, in the DD unit 20#3 connected to the DD unit 20#2 via the DC-BUS 18, it is possible to use electric power for charging and discharging the EV 32 connected via the charge / discharge cable 32a, in the same manner as in the V2H system #2 shown in FIG. 3. Even in the form of the power supply system 1a according to the modified example, the functions of the V2H system described in the first embodiment can be provided through the inverter unit 70 and the DD units 20#1 to 20#3 connected via the DC-BUS 18. For example, in the case where a second or third EV is introduced in a private home as EVs become more widespread, or where multiple EB (Electric Bike) charging stations are provided in a commercial facility, etc. (For example, for electric two-wheeled vehicles such as electric motorcycles and electric scooters) it is possible to suppress increases in facility costs and complexity of installation work due to expansion. According to the modified example, it is expected that the inverter unit will be smaller, the number of wires between units will be reduced, and installation work will be simplified.

[0069] (others) The above embodiment is merely an example, and the disclosure of the present embodiment may be modified as appropriate without departing from the spirit of the present disclosure. The processes and means described in the present disclosure may be freely combined and implemented as long as no technical contradiction occurs.

[0070] Furthermore, a process described as being performed by one device may be shared and executed by multiple devices. Or, a process described as being performed by different devices may be executed by one device. In a computer system, the hardware configuration for implementing each function can be flexibly changed.

[0071] <Computer-readable recording medium> A program for causing an information processing device or other machine or device (hereinafter, computer, etc.) to realize any of the above functions can be recorded on a recording medium readable by the computer, etc. Then, the computer, etc. can provide the function by reading and executing the program from the recording medium.

[0072] Here, a computer-readable recording medium refers to a recording medium that stores information such as data and programs through electrical, magnetic, optical, mechanical, or chemical action and can be read by a computer, etc. Among such recording media, those that can be removed from a computer, etc. include, for example, flexible disks, magneto-optical disks, CD-ROMs, CD-R / Ws, DVDs, Blu-ray disks, DATs, 8mm tapes, memory cards such as flash memory, etc. Furthermore, examples of recording media that are fixed to a computer, etc. include hard disks and ROMs.

[0073] In the following, the components of the present invention will be described with reference to the reference numerals in the drawings in order to make it possible to compare the components of the present invention with the configurations of the embodiments. <Invention 1> A power supply system (1) that is interconnected with an electric power system (50) and is capable of supplying power supplied from the electric power system (50) as charging power to at least one or more portable storage batteries (EV30, EV31) connected via charging / discharging cables (30a, 31a), comprising: a first power converter (INV12) that converts the supply power supplied from the power system (50) into DC power and outputs the DC power to a DC bus (16), and also converts the DC power supplied to the DC bus (16) into AC power and outputs the AC power to the power system (50); a second power converter (11) connected to the DC bus (16), converting a voltage of DC power input from the DC bus (50) to a predetermined voltage, outputting the voltage to a charge / discharge cable (30a) to which a first portable storage battery (EV30) is connected, and charging the first portable storage battery (EV30) via the charge / discharge cable (30a), and converting the voltage of DC power discharged from the first portable storage battery (EV30) via the charge / discharge cable (30a) and outputting the voltage to the DC bus (16); a third power converter (20) connected to a connection end between the DC bus (16) and the second power converter (11) via transition wirings (17, 18), converting a voltage of DC power input from the transition wirings (17, 18) to a predetermined voltage, outputting the voltage to a charge / discharge cable (31a) to which a second portable storage battery (EV31) is connected, charging the second portable storage battery (EV31) via the charge / discharge cable (31a), and converting the voltage of DC power discharged from the second portable storage battery (EV31) via the charge / discharge cable (31a) and outputting the voltage to the transition wiring (17, 18); A power supply system (1) comprising: [Explanation of symbols]

[0074] 1, 1a, 300 Power Supply System 10, 310 V2H power conditioner 11, 21, 311 Isolated bidirectional DC / DC converter 12, 312 INV (bidirectional inverter) 13, 23, 313 DD control section 13a, 23a Parallel operation function 14, 24, 314 Power supply (built-in battery) 15, 315 INV control unit 315a Parallel operation function 16, 316 DC bus 17 DC-Link 18 DC-BUS 20, 20#1, 20#2, 20#3 DD units 30, 31, 32, 301 EV 30a, 31a, 32a, 301a Charge / discharge cable 40, 303 Independent (battery storage system, load) 50, 302 system (commercial power system) 70 Inverter unit 101 Processor 102 Main storage 103 Auxiliary storage device 104 Communication Interface 105 Input / Output Interface N, N1 communication network

Claims

1. A power supply system that is connected to a power grid and is capable of supplying power supplied from the power grid as charging power to at least one or more portable storage batteries connected via a charging / discharging cable, a first power converter that converts supply power supplied from the power system into DC power and outputs the DC power to a DC bus, and also converts the DC power supplied to the DC bus into AC power and outputs the AC power to the power system; a second power converter connected to the DC bus, converting a voltage of DC power input from the DC bus to a predetermined voltage, outputting the voltage to a charge / discharge cable to which a first portable storage battery is connected, charging the first portable storage battery via the charge / discharge cable, and converting the voltage of DC power discharged from the first portable storage battery via the charge / discharge cable and outputting the voltage to the DC bus; a third power converter connected to a connection end between the DC bus and the second power converter via a jumper wiring, converting a voltage of DC power input from the jumper wiring to a predetermined voltage, outputting the voltage to a charge / discharge cable to which a second portable storage battery is connected, charging the second portable storage battery via the charge / discharge cable, and converting the voltage of DC power discharged from the second portable storage battery via the charge / discharge cable, and outputting the voltage to the jumper wiring; A power supply system comprising:

2. the second power converter and the third power converter are connected to each other via a predetermined communication line, the third power converter acquires information regarding the charging power of the second portable storage battery via a charge / discharge cable to which the second portable storage battery is connected, and notifies the second power converter of the information regarding the charging power acquired from the second portable storage battery via the predetermined communication line; 2. The power supply system according to claim 1, wherein the second power converter acquires information regarding the maximum dischargeable power of the first portable storage battery via a charge / discharge cable to which the first portable storage battery is connected, and charges the second portable storage battery connected to the third power converter via a charge / discharge cable based on information regarding the charging power of the second portable storage battery notified via the communication line and information regarding the maximum dischargeable power of the first portable storage battery, within a range not exceeding the maximum dischargeable power of the first portable storage battery.

3. the first power converter, the second power converter, and the third power converter are each housed in a separate housing; 2. The power supply system according to claim 1, wherein a DC power input / output terminal of the first power converter and a DC power input / output terminal of the second power converter are connected via a first bridging wiring, and an input / output terminal of the second power converter and a DC power input / output terminal of the third power converter are connected via a second bridging wiring.

4. A power conditioner provided in a power supply system that is connected to a power grid and can supply power supplied from the power grid as charging power to at least one portable storage battery connected via a charging / discharging cable, The power conditioner comprises: a first power converter that converts supply power supplied from the power system into DC power and outputs the DC power to a DC bus, and also converts the DC power supplied to the DC bus into AC power and outputs the AC power to the power system; A power supply system for a portable storage battery, comprising: a power supply unit for supplying a power from the portable storage battery to the power supply terminal of the portable storage battery; a power supply unit for supplying a power from the portable storage battery to the power supply terminal of the portable storage battery; and a second power converter configured to convert a voltage of the DC power discharged through the DC bus and output the converted voltage to the DC bus, a connection end between the DC bus and the second power converter is processed so as to be connectable via a jumper wiring to a third power converter capable of charging and discharging the second portable storage battery via a charge / discharge cable to which a second portable storage battery is connected and which is provided externally; The power conditioner is characterized by the above.

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