Power supply system and bidirectional power conversion device

Abstract

To provide an electric power supply system equipped with both a V2H system and a V2L system, which is configured so that a transportable power controller can be utilized more effectively.SOLUTION: An electric power supply system is equipped with: a first unit which comprises a first facility-side connection part, a first connector and a first electric power transmission passage through which the first facility-side connection part is joined to the first connector; a second unit which comprises a second facility-side connection part, a second connector and a second electric power transmission passage through which the second facility-side connection part is joined to the second connector; a third unit which comprises a third connector which is attachably and detachably connected to the first connector and the second connector and which AC power is inputted to and outputted from, a rectification circuit, a first voltage transformation circuit, a fourth connector, a second voltage transformation circuit and an inverse conversion circuit; and a movable external power source comprising a fifth connector that is attachably and detachably connected to the fourth connector of the third unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric power supply system, and more particularly to an electric power supply system for use in combination with an electric vehicle. [Background technology]

[0002] In recent years, electric vehicles (EVs), plug-in hybrid vehicles (PHVs), plug-in hybrid electric vehicles (PHEVs), and other vehicles that use electricity as their drive source and have built-in storage batteries that can be supplied with power from an external source have become popular.

[0003] In addition, V2H (Vehicle to Home) systems (e.g., Patent Document 1), which connect the drive batteries installed in these vehicles to the electrical systems of facilities such as homes, enabling the supply of power in both directions, and V2L (Vehicle to Load) systems (e.g., Patent Document 2), which enable the supply of power from on-board batteries to general household electrical appliances, are becoming more widespread and demand for them is increasing.

[0004] Furthermore, a power supply system including a portable power conditioner (hereinafter, "power conditioner") applicable to both the above V2H and V2L has also been proposed (for example, Patent Document 3). Specifically, Patent Document 3 discloses that components that are not necessary for a V2L system but are necessary for a V2H system (necessary for connection to a commercial power grid) are arranged in a stationary unit, and a portable power conditioner is used as a power supply device for the V2L system with a minimum configuration, while being connected to the stationary unit and relaying between the vehicle storage battery to configure a V2H system. With such a configuration, it is possible to realize a portable power conversion device that is suitable for carrying while achieving both V2H and V2L. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-122866 A [Patent Document 2] JP 2013-74719 A [Patent Document 3] JP 2020-150737 A Summary of the Invention [Problem to be solved by the invention]

[0006] By the way, when the inverter is used as a V2L device at a destination by the technology of the above Patent Document 3, the power terminal of the electrical device is connected to the outlet provided on the device body. On the other hand, air conditioners and lighting devices installed in a facility are generally configured to receive power directly from a distribution board installed in the facility, not through an outlet. In other words, there is a problem that it is difficult to use the above portable inverter as a power source for air conditioners and lighting devices installed in a facility that has lost power due to a disaster. In addition, according to laws and regulations, V2H devices that are permitted to be connected to the grid must apply to the power company, and a portable inverter procured from another source cannot be connected to a circuit that connects to the grid without permission.

[0007] The present invention has been made in consideration of the above-described circumstances, and aims to provide technology for more effectively utilizing a portable power conditioner in a power supply system that combines a V2H system and a V2L system. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention adopts the following configuration. a first unit including a first facility side connection portion connected to a first power input / output portion of a predetermined facility interconnected with an electric power grid, a first connector through which AC power is input / output, and a first power transmission line connecting the first facility side connection portion and the first connector; a second unit including a second facility side connection portion connected to a first power output portion connected only to an independent load, a second connector through which AC power is input and output, and a second power transmission line connecting the second facility side connection portion and the second connector; a third unit including: a third connector detachably connected to the first connector and the second connector and through which AC power is input and output; a rectifier circuit that converts the AC power input from the third connector into DC power; a first transformer circuit that transforms the DC power output from the rectifier circuit; a fourth connector through which DC power is input and output; a second transformer circuit that transforms the DC power input from the fourth connector; and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a movable external power source including a fifth connector detachably connected to the fourth connector of the third unit; A power supply system comprising:

[0009] Here, the term "predetermined facility" is used to include various types of facilities, such as a detached house, an apartment building, an office building, a commercial facility, and a government building. In addition, "independent" in the above means that it is not connected to a power grid. In addition, when the first transformer circuit and the second transformer circuit transform the voltage of one of them, the other transforms the voltage up, and which circuit transforms the voltage down or up may be determined according to the voltage of the "mobile external power source."

[0010] With the above-described configuration, the third unit (i.e., a portable power conditioner) can be used as a V2H device when connected to the first unit, and by removing the first and third units and connecting it to the second unit as a V2L device, it becomes possible to supply power to loads that are independent of the grid in the facility where the second unit is located.

[0011] The load may be a load that is fixedly installed in a facility where the first power output unit is installed. This makes it possible to supply power from an external power source to air conditioning equipment and lighting equipment that are fixedly installed in a facility and directly supplied with power from a distribution board or the like, using the third unit as a V2L device. In other words, it becomes possible to transport the third unit (and an external power source) to a facility that has experienced a power outage and operate the air conditioning and lighting of the facility.

[0012] The first unit further includes a first switch provided on the first power transmission path, a third facility side connection part connected to a second power output part connected only to an independent load in the specified facility, and a third power transmission path connecting the third facility side connection part and the first connector, The second unit may further include a fourth facility side connection part connected to a second power input / output part interconnected to the power grid, a fourth power transmission path connecting the fourth facility side connection part and the second connector, and a second switch provided on the fourth power transmission path.

[0013] With this configuration, the third unit can be connected by turning on each switch, allowing it to be used as a V2H device, and when used as a V2L device, the switches can be turned off to supply power to an independent load from the power grid. In other words, a power supply system that allows for flexible operation of the third unit can be provided.

[0014] The power supply system further includes a power supply unit for supplying the power from the third unit to the power grid. The third connector may further include a safety mechanism for preventing the third connector from being detached from the first connector or the second connector. With this configuration, when the third unit is detached from the first unit or the second unit to be used as a V2L device, it is possible to prevent the risk of detaching the connector while electricity is flowing to the power grid.

[0015] The safety mechanism may include the first switch and / or the second switch. With this configuration, each switch can be used as a safety mechanism, and the configuration of the device can be used efficiently.

[0016] In addition, the power supply system may further include a sixth connector that is detachably connected to the third connector of the third unit, and a power connection device that has a power terminal capable of outputting at least the power input from the sixth connector.

[0017] In order to use the third unit as a V2L device by removing it from the first unit (or the second unit), a terminal (such as an AC outlet) for connecting a load is required. However, when the third unit is connected to the first unit (or the second unit) and used as a V2H device, the terminal is not used and becomes a wasteful configuration. In general, the scenarios in which use as a V2L is expected are limited, and for users who wish to introduce it as a V2H device, the cost of the terminal is extra. In this regard, with the above-mentioned configuration, the terminal for connecting a load from the third unit is eliminated, thereby reducing the cost, and in scenarios in which use as a V2L is desired, the power connection device can be separately prepared to use the third unit as a device that also serves as a V2L device. The power terminal of the power connection device does not necessarily have to be an AC outlet, and may be a connector that is detachably connected to the first connector and the second connector.

[0018] The movable external power source may be a storage battery of an electric vehicle, and the fifth connector may be a charge / discharge terminal of the electric vehicle. Here, electric vehicles include EVs, PHVs, PHEVs, etc. With such a configuration, the present invention is preferably applied as a device that can be used for both V2H and V2L.

[0019] The power supply system may have at least one of the first unit, the second unit, and the third unit in plural, or may have a plurality of facilities equipped with the first unit and / or the second unit. With this configuration, it becomes possible to exchange power more flexibly using a portable power conditioner that can be used for both V2H and V2L.

[0020] The present invention also relates to an electric circuit including: an AC connector for inputting and outputting AC power; a rectifier circuit for converting the AC power inputted from the AC connector into DC power; a first transformer circuit for transforming the DC power outputted from the rectifier circuit; a DC connector for inputting and outputting DC power; a second transformer circuit for transforming the DC power inputted from the DC connector; and an inverse conversion circuit for converting the DC power outputted from the second transformer circuit into AC power; and a control unit that controls the electric circuit so as to be connectable to a commercial power system, and the bidirectional power conversion device that serves as the third unit described above.

[0021] The present invention can be achieved by combining the above-described configurations and processes as long as no technical contradiction occurs. Effect of the Invention

[0022] According to the present invention, a power supply system that combines a V2H system and a V2L system is provided. In this case, the portable power conditioner can be used more effectively. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a block diagram showing an outline of a power supply system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram for explaining a method of operating the inverter in the first embodiment. [Diagram 3]Fig. 3A is a schematic diagram showing a front view of the fixing unit and the inverter according to the first embodiment of the present invention, and Fig. 3B is a schematic diagram showing a side view of the fixing unit and the inverter according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a block diagram showing an outline of a power supply system according to a modified example of the first embodiment of the present invention. [Diagram 5] FIG. 5 is an explanatory diagram for explaining a method of operating the inverter in the modified example of the first embodiment. [Figure 6] FIG. 6 is a block diagram showing an outline of a power supply system according to another modified example of the first embodiment. [Figure 7] FIG. 7 is a block diagram showing an outline of a power supply system according to the second embodiment of the present invention. [Figure 8] FIG. 8 is an explanatory diagram for explaining a method of operating the inverter in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] <Application Examples> Hereinafter, application examples of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing an outline of a power supply system 1 to which the present invention can be applied. In Fig. 1, solid lines connecting each block indicate connections of power lines, and dashed lines connecting each block indicate connections of signal lines (including wireless communication).

[0025] As shown in FIG. 1, the power supply system 1 of this application example is configured to include a fixed unit 110 connected to an electrical circuit of a facility S11 that is interconnected with a power grid 150, a fixed unit 120 installed in a facility S12 different from the facility S11, a portable power conditioner 130 detachably connected to each of these fixed units 110, 120, and a storage battery 141 mounted on an electric vehicle 140 such as an EV that uses electric power as a driving force.

[0026] The fixed unit 110 includes a facility-side connection part 111 that connects to a distribution board 101 of the facility, a fixed-side connector 112 that functions as a connection part with the power conditioner 130, and a power circuit C11 that connects between the facility-side connection part 111 and the fixed-side connector 112. The distribution board 101 is capable of outputting power to a load L11 in the facility S11, and is configured to be capable of inputting and outputting power between the distribution board 101 and the power system 150. In this application example, the fixed unit 110 corresponds to a first unit, the distribution board 101 corresponds to a first power input / output part, and the power circuit C11 corresponds to a first power transmission path.

[0027] The fixed unit 120 also includes a facility-side connection section 121 that connects to a distribution board 102 of the facility S12, and a fixed-side connector 122 that functions as a connection section with the power conditioner 130. The distribution board 102 is configured to be able to output power to a load L12 in the facility S12, and is a distribution board that is not connected to the power system. The load L12 can be, for example, an air conditioner, a lighting device, or the like installed in the facility. In this application example, the fixed unit 120 corresponds to the second unit. The distribution board 102 corresponds to the first power output section, and the power circuit C12 corresponds to the second power transmission path.

[0028] The power conditioner 130 also includes a movable side AC connector 131 detachably connectable to the fixed side connector 112 of the fixed unit 110 and the fixed side connector 122 of the fixed unit 120, a bidirectional DC / AC inverter 134, a bidirectional DC / DC converter 135, and a movable side DC connector 132 connected to the electric vehicle 140. In this application example, the power conditioner 130 corresponds to the third unit. The electric vehicle 140 also includes an EV connector 142 detachably connectable to the power conditioner 130.

[0029] The facility-side connection unit 111 of the fixed unit 110 receives AC power from the power system 150 via the distribution board 101, and outputs AC power supplied from the power conditioner 130 via the fixed-side connector 112. The fixed-side connector 112 also receives AC power from the storage battery 141 of the electric vehicle 140 via the power conditioner 130, and outputs AC power supplied from the facility-side connection unit 111. That is, in this application example, the storage battery 141 corresponds to a movable external power source.

[0030] The fixed side connector 122 of the fixed unit 120 receives AC power from the storage battery 141 of the electric vehicle 140 via the power conditioner 130. The facility side connection unit 121 outputs power to the load L12 via the distribution board 102.

[0031] The movable-side AC connector 131 of the power conditioner 130 receives AC power from the fixed unit 110 via the fixed-side connector 112, and outputs power that has been converted to AC by a bidirectional DC / AC inverter 134, as described below. The movable-side DC connector 132 receives DC power from a storage battery 141 of the electric vehicle 140 via an EV connector 142, and outputs DC power that has been stepped down by a bidirectional DC / DC converter 135, as described below.

[0032] The bidirectional DC / AC inverter 134 is a bidirectional forward / reverse conversion circuit, which converts AC power input from the movable-side AC connector 131 into DC power and outputs it, and also converts DC power input from the movable-side DC connector 132 and boosted (or stepped down) by the bidirectional DC / DC converter 135 as described below into AC power and outputs it. That is, in this application example, the bidirectional DC / AC inverter 134 corresponds to a rectifier circuit and an inverse conversion circuit. Note that the bidirectional DC / AC inverter 134 may employ any known technology, and detailed description of an electrical circuit diagram and the like will be omitted.

[0033] The bidirectional DC / DC converter 135 is a bidirectional transformer circuit that steps down (or steps up) the power converted to DC by the bidirectional DC / AC inverter 134 and outputs it, and steps up (or steps down) the power input from the movable-side DC connector 132 and outputs it. That is, in this application example, the DC / DC converter 135 corresponds to a first transformer circuit and a second transformer circuit. Note that the bidirectional DC / DC converter 135 may employ any known technology, and detailed explanations such as an electrical circuit diagram will be omitted.

[0034] The EV connector 142 of the electric vehicle 140 is a connector that complies with an electric vehicle charging standard such as CHAdeMO and is configured to be connectable to a terminal of the storage battery 141, and the connection terminal is configured to enable bidirectional power supply. By connecting to the storage battery 141 via the EV connector 142, it becomes possible to supply power from the power conditioner 130 to the storage battery 141, and also to supply power from the storage battery 141 to the power conditioner 130.

[0035] In the power supply system 1 according to this application example, the fixed side connector 112 and the movable side AC connector 131 are normally connected, and the inverter 130 is attached to the fixed unit 110 and functions as a device for V2H. In such a case, the inverter 130 can be carried out to any location by detaching the movable AC connector 131 from the fixed connector 112. Then, by connecting the thus-carried inverter 130 to the fixed unit 120 (and the electric vehicle 140), it becomes possible to supply power to a load L12 that is provided in the facility S12 and receives power directly from the distribution board 102. Figure 2 shows a block diagram showing an outline of the system when the inverter 130 and the fixed unit 120 are connected.

[0036] <Embodiment 1> (Overall system configuration) Hereinafter, the embodiment of the present invention will be described in more detail with reference to the drawings. FIGS. 1, 2, and 3 are diagrams relating to the first embodiment of the present invention. Since this embodiment has the same system configuration as that described in the application example, the same reference numerals as those in the application example are used, and detailed description of the configuration already described in the application example will be omitted. FIGS. 1 and 2 are block diagrams showing a schematic configuration of a power supply system 1 of this embodiment. As described above, the power supply system 1 includes a fixed unit 110 connected to an electric circuit of a facility interconnected with a power system 150, a portable power conditioner 130 detachably connected to the fixed unit 110, and a storage battery 141 mounted on an electric vehicle 140 such as an EV that uses electric power as a driving force.

[0037] FIG. 3 is a schematic diagram illustrating the appearance of the fixed unit 110 and the power conditioner 130 in the power supply system 1 of this embodiment, where FIG. 3A shows the front of the fixed unit 110 and the power conditioner 130, and FIG. 3B shows the side of the fixed unit 110 and the power conditioner 130.

[0038] As shown in FIG. 3, the fixed unit 110 includes a housing having a power conditioner support portion 115 and a fixed side connector 112, and as shown in FIG. 1, the fixed unit 110 includes a facility side connection portion 111 and a power circuit C11. Although not shown, the fixed unit 110 has a structure (such as an engagement metal fitting) that is fixed to a wall surface of a facility such as a house on the back side, and the facility side connection portion 111 and the power system 150 are connected via a distribution board 101 of the facility. The fixed unit 110 can also be installed and fixed on the ground or a pedestal, and in this case, legs, a pedestal fixing member, etc. may be provided on the bottom of the power conditioner support portion 115. Here, only the structure of the fixed unit 110 will be described, but the fixed unit 120 of this embodiment also has a structure similar to that of the fixed unit 110.

[0039] 3, the power conditioner 130 includes a housing 31, a handle 32, a movable side AC connector 131 (and a cable), a movable side DC connector 132 (and a cable), an operation unit 136, a display unit 137, and an output terminal 138. Also, as shown in FIG. 1, the power conditioner 130 includes a bidirectional DC / AC inverter 134, a bidirectional DC / DC converter 135, and a control circuit 135.

[0040] The handle 32 is provided integrally with the housing 31, and functions as a handle when the inverter 130 is separated from the fixed unit 110 and transported. Note that the handle 32 is not an essential component, and there is no problem if the handle 32 is not provided as long as it does not interfere with transportation.

[0041] The movable side AC connector 131, the movable side DC connector 132, the bidirectional DC / AC inverter 134, and the bidirectional DC / DC converter 135 have been described above, and will not be described again. The operation unit 136 has a plurality of operation buttons and has a function of receiving user input via the operation buttons and transmitting it to the control circuit 135 described below. The display unit 137 is formed of, for example, a liquid crystal display or an LED lamp, and has a function of displaying information such as the operating state of the inverter 130 and responses to user operations.

[0042] The control circuit 135 includes a CPU (Central Processing Unit) and controls each part of the power conditioner 130. The control circuit 135 senses the current and voltage in the movable AC connector 131, the movable DC connector 132, the bidirectional DC / AC inverter 134, and the bidirectional DC / DC converter 135, and executes control required for system interconnection with the power system 150, such as suppressing the output from the storage battery 141 as necessary. The circuit configuration may employ any known technology constructed to satisfy requirements in accordance with the "Guidelines for Technical Requirements for System Interconnection Related to Ensuring Power Quality" established by the Agency for Natural Resources and Energy, and detailed description thereof will be omitted.

[0043] The output terminal 138 is provided in the housing 31 as, for example, a typical household AC 100V outlet, and is configured to be able to supply power to an external load by connecting an attachment plug of the external load. That is, when the power conditioner 130 is used as a V2L device, power can be supplied to an external load via the output terminal 138.

[0044] According to the power supply system 1 configured as above, a V2H system can be realized when the fixed side connector 112 of the fixed unit 110 is connected to the movable side AC connector 131 of the power conditioner 130, and the EV connector 142 of the electric vehicle 140 is connected to the movable side DC connector 132 of the power conditioner 130. Furthermore, by disconnecting the fixed side connector 112 and the movable side AC connector 131, it is possible to realize a V2L system that uses the storage battery 141 of the electric vehicle 140 as a power source.

[0045] 2, by connecting such a power conditioner 130 as a V2L device to a fixed unit 120, it becomes possible to use a storage battery 141 of an electric vehicle 140 as a power source for an independent load L12 in a facility S12. In this way, by providing fixed units 110, 120 for attaching and detaching the power conditioner 130 in the facilities S11, S12 and configuring the power conditioner 130 to be removable by attaching and detaching a cable, it becomes possible to supply power from the V2L device to the independent load L12 in the facility S12 (for example, air conditioners, lighting, electric water heaters, etc.) even during a power outage.

[0046] (Variation 1) In the above-described first embodiment, the fixed unit 110 and the fixed unit 120 are installed in different facilities, but the fixed unit 110 and the fixed unit 120 may be installed in the same facility. Such a modified example will be described below with reference to Fig. 4 and Fig. 5. However, in the following, the same components as those in the power supply system 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0047] Fig. 4 is a block diagram showing a schematic configuration of a power supply system 2 according to a first modified example of the power supply system 1. The power supply system 2 according to this modified example differs from the power supply system 1 of the first embodiment in that the fixed unit 110 and the fixed unit 120 are both installed in the same facility S21. Note that the detailed configurations of the fixed unit 110, the fixed unit 120, and the power conditioner 130 are shown in a simplified manner in Figs. 4 and 5.

[0048] The facility S21 according to this modification includes a fixed unit 110 connected to a distribution board 101 that is interconnected with the power grid 150, and a fixed unit 120 connected to a distribution board 102 that supplies power to an independent load L12 that is not interconnected with the power grid 150. During normal times when power is supplied from the power grid 150, power may be supplied to a storage battery 141 of an electric vehicle 140 from a power conditioner 130 connected to the fixed unit 110.

[0049] On the other hand, when the power supply from the power grid 150 is stopped due to a disaster or other reason, Power is supplied from the storage battery 141 of the vehicle 140 to the load L11 via the power conditioner 130, and also other V2L devices are connected to the fixed unit 120 to supply power to the load L12. A method of using the power supply system 2 according to this application example during a power outage is shown in FIG.

[0050] 5, in the power supply system 2 according to this application example, a power conditioner 230 is connected to the fixed unit 120 as necessary, and power is supplied from a storage battery 241 of an electric vehicle 240 via the power conditioner 230. Note that the configurations of the power conditioner 230 and the electric vehicle 240 are similar to those of the power conditioner 130 and the electric vehicle 140, respectively, and therefore detailed explanations will be omitted. This makes it possible to operate the load L12 by receiving power from the storage battery 241.

[0051] As a specific method of utilizing the power supply system 2 according to this application example, for example, equipment similar to that of facility S21 may be provided in another facility (not shown) other than facility S21, and when facility S21 experiences a power outage due to a disaster or the like, a power conditioner 230 may be transported by electric vehicle 240 from the other facility that is not affected by the power outage, thereby supplying power to load L12 of facility S21 during the power outage.

[0052] (Variation 2) 6 is a block diagram showing a schematic configuration of a power supply system 3 according to another modified example of embodiment 1. Power supply system 3 differs from power supply system 1 in that power conditioner 330 does not have output terminal 138, but has outlet box 300 connectable to movable AC connector 131 of power conditioner 330. Other configurations of power conditioner 330 are similar to those of embodiment 1, so detailed description will be omitted.

[0053] The outlet box 300 is a portable device equipped with an outlet box connector 301 detachably connected to the movable side AC connector 131, and an output terminal 302 serving as an AC 100V outlet. That is, in this embodiment, the outlet box 300 corresponds to a power connection device. The outlet box 300 further includes an input / output connector 303 detachably connectable to the fixed side connector 112 and the fixed side connector 122.

[0054] In this embodiment, the inverter 330 body is not provided with an output terminal for an external load, so the inverter 330 cannot be used as a V2L device as is. However, by connecting the outlet box connector 301 to the movable AC connector 131 removed from the fixed connector 112, the output terminal 302 of the outlet box 300 can be used as an output terminal for an external load. Furthermore, since the inverter 330 is also provided with an input / output connector 303 that is detachably connectable to the fixed connector 112 and the fixed connector 122, it is also possible to supply power from the storage battery 141 to the load L12 via the inverter 330 and the outlet box 300 by connecting the input / output connector 303 to the fixed connector 122.

[0055] Generally, V2L is expected to be used in limited situations such as during disasters, so for users who wish to introduce a power supply system as V2H, the cost of the output terminals provided on the inverter is extra. In this regard, with a configuration like the power supply system 3 of this embodiment, the inverter 330 does not have an output terminal for an external load, reducing costs, and users who wish to use it as a V2L device can use it as a V2L device by preparing a separate outlet box 300.

[0056] <Embodiment 2> Next, a power supply system 4 according to a second embodiment of the present invention will be described with reference to Fig. 7 and Fig. 8. Figs. 7 and 8 are block diagrams showing a schematic configuration of the power supply system 4. The power supply system 4 according to this embodiment differs from the power supply system 1 of the first embodiment in the configurations of the fixed units 410, 420 and the distribution boards 401, 402 of the facilities S41 and S42. Meanwhile, the configurations of the power conditioner 130 and the electric vehicle 140 are similar to those described in the first embodiment, and therefore detailed description thereof will be omitted.

[0057] 7, the fixed unit 410 of this embodiment includes facility-side connectors 411 and 414 that connect to a distribution board 401 of the facility S41, and a fixed-side connector 412 that is a connector with the power conditioner 130. The fixed unit 410 also includes a power circuit C41 that connects the facility-side connector 411 and the fixed-side connector 412, and a power circuit C43 that connects the facility-side connector 414 and the fixed-side connector 412, and a switch 413 is provided in the power circuit C41.

[0058] The facility-side connection unit 411 of the fixed unit 410 receives AC power from the power system 150 via the distribution board 401, and outputs AC power supplied from the power conditioner 130 via the fixed-side connector 412. The fixed-side connector 412 also receives AC power from the storage battery 141 of the electric vehicle 140 via the power conditioner 130, and outputs AC power supplied from the facility-side connection units 411, 414.

[0059] Furthermore, the AC power output from the facility-side connection unit 411 is supplied to a load L11, which is a general load, via the distribution board 401, and can also be sold as surplus power to the power grid 150. That is, the facility-side connection unit 411 is interconnected with the power grid 150. On the other hand, the AC power output from the facility-side connection unit 414 is supplied via the distribution board 401 to an independent load L41 that is not interconnected with the power grid 150.

[0060] When the switch 413 of the power circuit C41 in the fixed unit 410 is ON, the facility-side connection part 411 and the fixed-side connector 412 are connected, so that when the movable-side AC connector 131 and the fixed-side connector 412 of the inverter 130 are connected, the inverter 130 is interconnected with the power grid 150. On the other hand, when the switch 413 is OFF, the facility-side connection part 411 and the fixed-side connector 412 are disconnected, and the power input from the fixed-side connector 412 is output only to the independent load L41.

[0061] The fixed unit 420 and distribution board 402 of the facility S42 have the same configuration as above. That is, the fixed unit 430 includes facility-side connections 421, 424 that connect to the distribution board 402 of the facility S42, and a fixed-side connector 422 that is a connection part with the power conditioner 130. In addition, the fixed unit 430 includes a power circuit C42 that connects the facility-side connection 421 and the fixed-side connector 422, and a power circuit C44 that connects the facility-side connection 424 and the fixed-side connector 422, and a switch 423 is provided in the power circuit C44.

[0062] Furthermore, the AC power output from the facility-side connection unit 424 is supplied to a load L42, which is a general load, via the distribution board 402, and can also be sold as surplus power to the power grid 150. That is, the facility-side connection unit 424 is interconnected with the power grid 150. On the other hand, the AC power output from the facility-side connection unit 421 is supplied via the distribution board 402 to an independent load L12 that is not interconnected with the power grid 150.

[0063] When the switch 423 of the power circuit C44 in the fixed unit 420 is ON, the facility side connection part 424 and the fixed side connector 412 are connected, and when the movable side AC connector 131 of the inverter 130 is connected to the fixed side connector 412, the inverter 130 and the power system 150 are interconnected. The side connection part 424 and the fixed side connector 422 are disconnected, and the power input from the fixed side connector 422 is output only to the independent load L12.

[0064] That is, in this embodiment, the fixed units 410 and 420 each serve as both the first unit and the second unit.

[0065] In this embodiment, the switches 413, 423 can also function as a safety mechanism to prevent the movable AC connector 131 from being removed from the fixed connector 412 or the fixed connector 422 while the inverter 130 is electrically connected to the power grid 150. When removing the movable AC connector 131 from the fixed connector 412 or the fixed connector 422, the risk of electric shock can be prevented by turning off the switches 413, 423 of the fixed units 410, 420 using an operation button (not shown).

[0066] In such a power supply system 4, when the inverter 130, which is normally installed in facility S41, is used as a V2L device during a power outage in facility S42, by turning off the switch 423 of the fixed unit 420 as shown in FIG. 8, it becomes possible to supply power only to the independent load L12 without connecting the inverter 130 to the power grid 150.

[0067] In the power supply system of the first embodiment, wiring work for the fixed unit 110 connected to the power system 150 and the load L11 and wiring work for the fixed unit 120 connected only to the load L12 are different from each other, so there is a possibility of mistakes occurring. In this regard, as in the power supply system 4 according to the present embodiment, if the fixed unit 410 and the fixed unit 420 are made to have a common configuration and wiring work for connecting to the power system 150 and the load and wiring work for connecting only to the independent load are performed, it is possible to reduce the variety of products and reduce manufacturing costs, and it is possible to make the wiring work the same, and it is possible to prevent mistakes in construction. Then, by making it possible to switch whether or not to connect to the power system 150 by a switch, it becomes possible to supply power to the independent load using a V2L device that is not authorized to connect to the power system 150.

[0068] <Other> The above-mentioned embodiments merely exemplify the present invention, and the present invention is not limited to the above-mentioned specific embodiments. The present invention can be modified in various ways within the scope of its technical concept. For example, as in the first modification of the first embodiment, a plurality of fixed units of the second embodiment may be provided in the same facility. It is also possible to build a large-scale power supply system that includes a large number of fixed units (and the facility in which they are located), power conditioners, and electric vehicles.

[0069] In addition, in each of the above examples, an AC 100V outlet is used as the output terminal of the inverter, but this is not limited to this, and the inverter can be provided with any desired output terminal, such as a USB terminal. Furthermore, an input / output terminal that can input power as well as output power may be provided.

[0070] Furthermore, the power supply system of each of the above examples can be operated in cooperation with another smart grid system such as a Home Energy Management System (HEMS), or as a part of the system.

[0071] <Appendix 1> A first facility side connection unit (111) connected to a first power input / output unit (101) of a predetermined facility (S11) connected to a power system (150), a first connector (112) through which AC power is input / output, and a first power transmission line (C11) connecting the first facility side connection unit and the first connector. A first unit (110) having a second unit including a second facility side connection part (121) connected to a first power output part (102) connected only to an independent load (L12), a second connector (122) through which AC power is input and output, and a second power transmission line (C12) connecting the second facility side connection part and the second connector; a third unit (130) including a third connector (131) detachably connected to the first connector and the second connector and through which AC power is input and output, a rectifier circuit (133) that converts the AC power input from the third connector into DC power, a first transformer circuit (134) that transforms the DC power output from the rectifier circuit, a fourth connector (132) through which DC power is input and output, a second transformer circuit (134) that transforms the DC power input from the fourth connector, and an inverter circuit (133) that converts the DC power output from the second transformer circuit into AC power; a mobile external power source (141) having a fifth connector (142) detachably connected to the fourth connector of the third unit; A power supply system (1) comprising: [Explanation of symbols]

[0072] 1, 2, 3, 4... Power supply system 101, 102, 401, 402... Distribution board 110, 210, 410, 420... Fixed unit 111, 121, 411, 414, 421, 424... Facility side connection part 112, 122, 412, 422...Fixed connector 413, 423... Switch 115···Power conditioner support part 130, 330... Power conditioner 131···Movable side AC connector 132 Movable side DC connector 133 Bidirectional DC / AC Inverter 134 Bidirectional DC / DC Converter 135 Control circuit 136...Operation unit 137...Display section 138, 302... Output terminal 31... Enclosure 32 Handle 140, 240...Electric vehicle 141, 241... Battery 142···EV Connector 150...Electric power system 300···Outlet box 301···Outlet box connector C11, C12, C41, C42, C43, C44...Power circuit L11, L12, L41, L42...Load S11, S12, S21, S41, S42...Facilities

Claims

1. a first unit including a first facility side connection portion connected to a first power input / output portion of a predetermined facility interconnected with an electric power grid, a first connector through which AC power is input / output, and a first power transmission line connecting the first facility side connection portion and the first connector; a second unit including a second facility side connection portion connected to a first power output portion connected only to an independent load, a second connector through which AC power is input and output, and a second power transmission line connecting the second facility side connection portion and the second connector; a third unit including: a third connector detachably connected to the first connector and the second connector and through which AC power is input and output; a rectifier circuit that converts the AC power input from the third connector into DC power; a first transformer circuit that transforms the DC power output from the rectifier circuit; a fourth connector through which DC power is input and output; a second transformer circuit that transforms the DC power input from the fourth connector; and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a movable external power source including a fifth connector detachably connected to the fourth connector of the third unit; A power supply system comprising:

2. 2. The power supply system according to claim 1, wherein the independent load is a load that is fixedly installed in a facility in which the first power output unit is provided.

3. a first general load and a second independent load are connected to the first power input / output unit, and the first facility side connection unit is connected to the power grid and the first general load via the first power input / output unit, the first unit further includes a first switch provided on the first power transmission path, a third facility side connection portion connected to a second power output portion of the first power input / output portion that is connected only to the second independent load, and a third power transmission path connecting the third facility side connection portion and the first connector, The first power output unit is a terminal provided in a second power input / output unit of another facility interconnected with the power system, and a second general load and the independent load are connected to the second power input / output unit, The second unit connects a fourth facility side connection portion connected to the power system and the second general load via the second power input / output portion, and the fourth facility side connection portion and the second connector. Further comprising: a fourth power transmission path; and a second switch provided in the fourth power transmission path.

3. The power supply system according to claim 1 or 2.

4. a safety mechanism for preventing the third connector from being detached from the first connector or the second connector while the third unit is electrically connected to the power system; 4. The power supply system according to claim 3 .

5. The safety mechanism includes: The first switch and / or the second switch are included, 5. The power supply system according to claim 4.

6. The third unit further includes a sixth connector detachably connected to the third connector of the third unit, and a power connection device including a power terminal capable of outputting at least the power input from the sixth connector.

6. The power supply system according to claim 1, wherein the power supply system is a power supply unit.

7. The mobile external power source is a storage battery of an electric vehicle, and the fifth connector is a charging / discharging terminal of the electric vehicle.

7. A power supply system according to claim 1, wherein the power supply system comprises:

8. The first unit, the second unit, or the third unit may be provided in a plurality of units.

8. A power supply system according to claim 1, wherein the power supply system comprises:

9. The facility has a plurality of facilities each including at least one of the first unit and the second unit.

9. A power supply system according to claim 1, wherein the power supply system comprises:

10. The facility including the first unit and the facility including the second unit are different facilities.

10. The power supply system according to claim 9.

11. an electric circuit including: an AC connector for inputting and outputting AC power; a rectifier circuit for converting the AC power inputted from the AC connector into DC power; a first transformer circuit for transforming the DC power outputted from the rectifier circuit; a DC connector for inputting and outputting DC power; a second transformer circuit for transforming the DC power inputted from the DC connector; and an inverse conversion circuit for converting the DC power outputted from the second transformer circuit into AC power; A control unit that controls the electric circuit so as to be connectable to a power system, A bidirectional power conversion device that serves as the third unit in the power supply system according to claim 1 .

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