Full-load distribution board and power supply system including the full-load distribution board

Abstract

To provide an all-load power distribution board for supplying power from a system and a distributed power source to loads and allowing stable operation by combination with a power supply device.SOLUTION: An all-load power distribution board comprises: an automatic change-over switch that switches between a first input terminal for power input from a system and a second input terminal for power input from a distributed power source for connection to an output terminal for output to loads; and a first terminal block and a second terminal block that are disposed in a cable way connecting the system and the first input terminal. The first terminal block has a first terminal connected to a first commercial power line connected to the system, and a second terminal connected to a first distributed power source connection line connecting the distributed power source and the system and to a second commercial power line connecting the first and second terminal blocks. The second terminal block has a third terminal connected to the second commercial power line, and a fourth terminal connected to a third commercial power line connecting the second terminal block and the first input terminal. A first power supply line for supplying power from a power supply device can be connected to the third or fourth terminal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a full load distribution board and a power supply system including the full load distribution board. [Background technology]

[0002] Conventionally, a power supply system has been known in which, when the power supply from the commercial power grid is interrupted, the power stored in a storage battery is output from an independent output terminal of a power conditioner connected to the storage battery, and supplied to a specific load connected to a specific load distribution panel.

[0003] In recent years, as described in Patent Document 1, a power supply system has been proposed that includes a full-load distribution board that can supply power to general loads, not just specific loads, when power supply from a commercial power system is interrupted.

[0004] Power supply systems are also in use that supply electricity generated by fuel cells and utilize the heat generated during power generation for hot water supply, etc. Such power supply systems are generally connected to a main distribution panel and have dedicated outlets for connecting loads when the power supply from the commercial power grid is cut off, which are provided separately from the electrical circuit that runs through the specific load distribution panel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-198203 Summary of the Invention [Problem to be solved by the invention]

[0006] However, if a power supply device including a fuel cell is connected to a main distribution panel to which a commercial power grid and a storage battery are connected via a full-load distribution panel, even if the power supply from the commercial power grid is stopped, power discharged from the storage battery will be supplied to the load via the main distribution panel. In this case, the power supply device including the fuel cell may attempt to connect to the grid by treating the storage battery as the commercial power grid. Because the storage battery may behave differently from the commercial power grid depending on conditions such as the load, the operation of the power supply device including the fuel cell may become unstable and may stop.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a full-load distribution board that supplies power to loads from a commercial power system and a distributed power source, and that can be further combined with a power supply device to operate stably. [Means for solving the problem]

[0008] To solve the above problems, the present invention provides: an automatic transfer switch having a first input terminal to which power supplied from a commercial power system is input, a second input terminal to which power supplied from a distributed power source is input, and an output terminal from which power supplied to a load is output, the automatic transfer switch switching the first input terminal and the second input terminal to connect to the output terminal; a first terminal block and a second terminal block disposed on an electrical path having one end connected to the commercial power system and the other end connected to the first input terminal; A full-load distribution board comprising: The first terminal block is connected to a first terminal to which one end of a first commercial power line, the other end of which is connected to the commercial power system, one end of a first distributed power source connection line that connects the distributed power source and the commercial power system, and one end of a second commercial power line that connects the first terminal block and the second terminal block. and a second terminal connected to the The second terminal block has a third terminal to which the other end of the second commercial power line is connected, and a fourth terminal to which one end of a third commercial power line that connects the second terminal block and the first input terminal is connected, and one end of a first power supply line that supplies power from a power supply device can be connected to either the third terminal or the fourth terminal.

[0009] In this invention, in a full-load distribution board equipped with an automatic changeover switch that switches between a first input terminal supplied with power from a commercial power system and a second input terminal supplied with power from a distributed power source and connects them to an output terminal, one end of a first power supply line that supplies power from a power supply device can be connected to a third or fourth terminal of a second terminal block arranged on an electrical circuit that has one end connected to the commercial power system and the other end connected to the first input terminal, so that power supplied by the power supply device can be supplied to a load independently of power supply from the distributed power source.In this way, according to the invention, it is possible to provide a full-load distribution board that supplies power to a load from a commercial power system and a distributed power source, and that can be further combined with a power supply device for stable operation.

[0010] In addition, in the present invention, a current detector can be connected to the power supply device to detect a current supplied from the commercial power system, in order to control the power supplied to the third commercial power line based on a detection result of the current detector; The second commercial power line may be a current detector wiring through which a current to be detected by the current detector flows.

[0011] In this way, if the second commercial power line connected to the third terminal of the second terminal block and carrying current supplied from the commercial power system is used as wiring for the current detector, the power supply device connectable to the second terminal block can control the power supplied to the third commercial power line based on the detection results of the power detector and in accordance with the status of the power supplied from the commercial power system, thereby enabling the power supply device combined with the full-load distribution board to operate stably.

[0012] In addition, in the present invention, a current detector can be connected to the power supply device to detect a current supplied from the commercial power system, in order to control the power supplied to the third commercial power line based on a detection result of the current detector; The second commercial power line may be provided with a mounting space for mounting the current detector.

[0013] By mounting a current detector in the mounting space thus provided, the current flowing through the second commercial power line connected to the third terminal of the second terminal block, i.e., the current supplied from the commercial power system, can be detected by the power detector. Therefore, the power supply device connectable to the second terminal block can control the power supplied to the third commercial power line according to the status of the power supplied from the commercial power system based on the detection result of the current detector, thereby enabling stable operation of the power supply device combined with the full-load distribution board.

[0014] In addition, in the present invention, The distributed power source may include at least one of a storage battery and a solar cell.

[0015] In this way, the distributed power source that supplies power to the load via the second input terminal of the automatic transfer switch of the full-load distribution board according to the present invention includes at least one of a storage battery and a solar cell. That is, the distributed power source may include a storage battery, a solar cell, or a storage battery. The distributed power supply of the present invention may include both a battery and a solar cell. In this way, a full-load distribution board that can supply power to loads from a commercial power system and a distributed power supply and operate stably by combining power supply devices can be provided, and can be applied to various distributed power sources. However, the distributed power source of the present invention is not limited to these, and various power sources such as wind power generation can be applied.

[0016] The present invention also provides the full load distribution board; the distributed power source; A power supply system comprising: a first power conversion device that converts power supplied from the commercial power system via the distributed power source connection line or power output from the distributed power source to the first distributed power source connection line; a second power conversion device that converts the power supplied from the distributed power source and inputs the converted power to the second input terminal; The present invention is characterized by the following.

[0017] In this way, it is possible to construct a power supply system that includes a full-load distribution board that supplies power to loads from a commercial power system and a distributed power source, and a distributed power source, and that can be further combined with power supply devices to operate stably.

[0018] The present invention also provides The full-load distribution board, a first breaker connected to the other end of the first distributed power supply connection line; a second breaker provided in an electrical path connecting the second input terminal and the distributed power source; a third breaker provided in an electric circuit connecting the output terminal and a main distribution board to which the load is connected; a full load distribution board having the distributed power source; A power supply system comprising: a first power conversion device connected to the first breaker at one end of a second distributed power source connection line, the other end of which is connected to the first breaker, and configured to convert power supplied from the commercial power system or power output from the distributed power source to the second distributed power source connection line; a second power conversion device connected to the second breaker at one end of a second power supply line, the other end of which is connected to the second breaker, and which converts the power supplied from the distributed power source and supplies the converted power to the load; The present invention is characterized by the following.

[0019] In this way, breakers are provided to cut off each circuit in the event of an abnormality such as excessive current flowing in the distributed power source connection line, the circuit to which power is supplied from the distributed power source, or the circuit connecting the output terminal and the main distribution board.Therefore, it is possible to construct a power supply system that includes a full-load distribution board that supplies power to loads from the commercial power system and the distributed power source, and a distributed power source, and that can be further combined with power supply devices to operate stably.

[0020] The present invention also provides The power supply device may further be included.

[0021] In this way, a power supply system can be constructed that includes a full-load distribution board that supplies power to loads from the commercial power system and distributed power sources, a distributed power source, and a power supply device, and is capable of providing a stable power supply.

[0022] The present invention also provides The power supply device may generate electricity by gas power generation.

[0023] Various power supply devices can be applied as the power supply device connected to the second terminal block of the full-load distribution board, but by applying a power supply device that generates electricity through gas generation, such as a fuel cell that generates electricity by reacting hydrogen generated from gas with oxygen in the air, it is possible to build a power supply system that can supply electricity stably from a variety of power sources. [Effects of the Invention]

[0024] According to the present invention, it is possible to provide a full-load distribution board that supplies power to loads from a commercial power system and a distributed power source, and that can be further combined with a power supply device to operate stably. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram showing an outline of the internal configuration of a full-load distribution board according to an embodiment of the present invention. [Figure 2] 1 is a block diagram showing a schematic configuration of a power supply system according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0026] [Application example] Hereinafter, application examples of the present invention will be described with reference to the drawings. 1 shows a schematic internal configuration of a full-load distribution board 1 to which the present invention is applied. FIG. 2 shows the overall configuration of a power supply system including the full-load distribution board 1 and a power storage system 100.

[0027] As shown in Fig. 2, the full-load distribution board 1 supplies power to general loads connected to the main distribution board 110. Here, the general load refers to a load that can be supplied with power, regardless of the specific load, even when the power supply from the commercial power system is stopped due to some abnormality, just as when power is being supplied without any problems from the commercial power system.

[0028] The full-load distribution board 1 uses an automatic switching switch 5 to switch between power supplied from the commercial power system and power supplied from the energy storage system 100, and supplies it to general loads 111 connected to the main distribution board 110 via a main distribution board breaker 7.

[0029] Power supplied from the commercial power system is input to a first input terminal 51 of the automatic transfer switch 5 via a first commercial power line 11, a first terminal block 2, a second commercial power line 12, and a third commercial power line 13. On the other hand, power supplied from the power storage system 100 is input to a second input terminal 52 of the automatic transfer switch 5 via a first transformer unit connection line 63, a transformer unit breaker 6, and a second transformer unit connection line 64. The automatic transfer switch 5 switches either the first input terminal 51 or the second input terminal 52 to connect it to an output terminal 53.

[0030] A first power supply line 121 for inputting power supplied from the fuel cell unit 120 can be connected to the primary terminal 41 or secondary terminal 42 of the second terminal block 4 of the full-load distribution board 1. This allows the power supplied from the fuel cell unit 120 to be input to the first input terminal 51 of the automatic transfer switch 5 via the second terminal block 4 and the third commercial power line 13. In addition, a space (CT mounting space) 9 is provided on the primary side of the second terminal block 4 for mounting a CT 122 that detects the current flowing through the second commercial power line 12 and inputs the detection result to the fuel cell unit 122 via a first current detection line 123.

[0031] As shown in FIG. 2, the power storage system 100 includes a storage battery unit 102 including a storage battery 101 and a PV unit 104 including a solar cell 103. The power supplied from the power supply 104 is converted by the power conditioner 105, transformed by the transformer unit 106, and output to the full-load distribution board 1. A CT 107 that detects the current flowing through the first commercial power line 11 is connected to the power conditioner 105 by a second current detection line 108, and the detection result by the CT 107 is input to the power conditioner 105.

[0032] By setting the detection locations of the CT 107 and the CT 122 as described above, the power storage system 100 and the fuel cell unit 120 can accurately obtain information for their respective controls without being affected by the other system.

[0033] When power is being supplied from the commercial power system, the automatic transfer switch 5 is connected to the first input terminal 51, so that the fuel cell unit 120 is connected to the commercial power system and can supply the necessary power to the general load 111. When the power supply from the commercial power system is stopped, the automatic transfer switch 5 is switched to the second input terminal 52, so that the power supplied from the power storage system 100 can be supplied to the general load 111.

[0034] By applying the present invention in this manner, it is possible to provide a full-load distribution board 1 that supplies power from a commercial power system and a storage battery 101 to a general load 111, and that can be further combined with a fuel cell unit 120 to operate stably.

[0035] Example 1 Hereinafter, a full-load distribution board 1 and a power supply system 200 including the full-load distribution board 1 according to a first embodiment of the present invention will be described in more detail with reference to the drawings. However, the configurations of the devices and systems described in this embodiment should be modified as appropriate depending on various conditions. In other words, it is not intended that the scope of the present invention be limited to the following embodiment.

[0036] (Full load distribution board) In the full-load distribution board 1, by switching the automatic transfer switch 5, when power is being supplied from the commercial power system, the power supplied from the commercial power system is supplied to general loads 111 connected to the main distribution board 110 (see FIG. 2), and when the supply of power from the commercial power system is stopped, the power supplied from the power storage system 100 (see FIG. 2) is supplied to the general loads 111 connected to the main distribution board 110. Here, the full-load distribution board 1, the automatic transfer switch 5, and the general loads 111 correspond to the full-load distribution board, the automatic transfer switch, and the loads of the present invention, respectively.

[0037] FIG. 1 is a diagram illustrating an outline of the internal configuration of a full-load distribution board 1 according to a first embodiment. The devices, components, and wiring shown in FIG. 1 are housed inside a roughly rectangular parallelepiped housing that is flat from front to back. A shield plate having openings that expose predetermined components such as operating handles and a display unit is attached to the front of the housing. FIG. 1 illustrates a schematic internal configuration of such a full-load distribution board 1 as viewed from the front side with the shield plate removed, with the internal structure of the full-load distribution board 1 appropriately omitted. The full-load distribution board 1 is installed on a wall or the like so that the up-down direction of the page corresponds to the up-down direction in the vertical direction. Hereinafter, when the full-load distribution board 1 is installed in this manner, the side facing the wall or the like is referred to as the back side, and the side opposite the back side is referred to as the front side, and the up-down, left-right directions refer to the directions as viewed from the front side.

[0038] Here, power supplied from a commercial power system is input to a full-load distribution board 1 through a single-phase three-wire first commercial power line 11. The first commercial power line 11 consists of three wires: a U-phase power line 11u, a neutral wire 11o, and a W-phase power line 11w. The first commercial power line 11 is connected to a primary terminal 21 of a first terminal block 2 attached to the full-load distribution board 1. The primary terminal 21 of the first terminal block 2 consists of three terminals: a U-phase terminal 21u, a neutral terminal 21o, and a W-phase terminal 21w. One end of the U-phase power line 11u, the neutral line 11o, and one end of the W-phase power line 11w of the first commercial power line 11 are connected to the first terminal block 2. The other end of the first commercial power line 11 is connected to a main earth leakage breaker, a contract breaker, or a smart meter outside the full-load distribution board 1. Here, the first terminal block 2 corresponds to the first terminal block of the present invention, and the primary-side terminal 21 corresponds to the first terminal of the present invention. In FIG. 1, for the sake of explanation, the U-phase power line is shown by a solid line, the neutral line by a dashed line, and the W-phase power line by a broken line.

[0039] The first terminal block 2 is provided with secondary terminals 22. The secondary terminals 22 consist of three terminals: a U-phase terminal 22u, a neutral terminal 22o, and a W-phase terminal 22w. The U-phase terminal 22u, the neutral terminal 22o, and the W-phase terminal 22w are connected to the U-phase terminal 21u, the neutral terminal 21o, and the W-phase terminal 21w, respectively, that constitute the primary terminals 21, by conductive members provided inside the first terminal block 2. Here, the secondary terminals 22 correspond to the second terminals of the present invention.

[0040] A power storage system breaker 3 is provided on the secondary side of the first terminal block 2. The power storage system breaker 3 breaks the circuit when an abnormal event occurs, such as an excessive current flowing through the power storage system 100 connected to the secondary side. The power storage system breaker 3 has a primary side terminal 31 and a secondary side terminal 32. The primary side terminal 31 of the power storage system breaker 3 is connected to the secondary side terminal 22 of the first terminal block 2 by a first power storage system connection line 33. The primary side terminal 31 consists of three terminals: a U-phase terminal 31u, a neutral terminal 31o, and a W-phase terminal 31w. One ends of the U-phase connection line 33u, the neutral terminal 33o, and the W-phase connection line 33w that constitute the first power storage system connection line 33 are connected to the U-phase terminal 22u, the neutral terminal 22o, and the W-phase terminal 22w that constitute the secondary side terminal 22 of the first terminal block 2, respectively. The other ends of the U-phase connecting wire 33u, the neutral wire 33o, and the W-phase connecting wire 33w constituting the first power storage system connecting wire 33 are connected to the U-phase terminal 31u, the neutral terminal 31o, and the W-phase terminal 31w constituting the primary side terminal 31 of the power storage system breaker 3. Here, the first power storage system connecting wire 33 corresponds to the first distributed power source connecting wire of the present invention. Also, the power storage system breaker 3 corresponds to the first breaker of the present invention.

[0041] The secondary terminal 32 of the power storage system breaker 3 consists of three terminals: a U-phase terminal 32u, a neutral terminal 32o, and a W-phase terminal 32w. The secondary terminal 32 of the power storage system breaker 3 is connected to the power storage system 100 (described later) by a second power storage system connecting wire 34. The second power storage system connecting wire 34 consists of a U-phase connecting wire 34u, a neutral wire 34o, and a W-phase connecting wire 34w. The U-phase connecting wire 34u, the neutral wire 34o, and the W-phase connecting wire 34w of the second power storage system connecting wire 34 are connected to the U-phase terminal 32u, the neutral terminal 32o, and the W-phase terminal 32w of the secondary terminal 32 of the power storage system breaker 3, respectively. Here, the second power storage system connecting wire 34 corresponds to the second distributed power source connecting wire of the present invention.

[0042] A second terminal block 4 is also provided on the secondary side of the first terminal block 2. The second terminal block 4 has a primary terminal 41 and a secondary terminal 42. The primary terminal 41 consists of three terminals: a U-phase terminal 41u, a neutral terminal 41o, and a W-phase terminal 41w. The secondary terminal 42 consists of three terminals: a U-phase terminal 42u, a neutral terminal 42o, and a W-phase terminal 42w. The U-phase terminal 41u, the neutral terminal 41o, and the W-phase terminal 41w of the primary terminal 41 are connected to the U-phase terminal 42u, the neutral terminal 42o, and the W-phase terminal 42w of the secondary terminal 42, respectively, by conductive members provided inside the second terminal block 4. The first terminal block 2 and the second terminal block 4 are connected by a second commercial power line 12. The second commercial power line 12 consists of three wires: a U-phase power line 12u, a neutral terminal 12o, and a W-phase power line 12w. The U-phase terminal 22u of the secondary side terminal 22 of the first terminal block 2 is connected to the U-phase terminal 41u of the primary side terminal 41 of the second terminal block 4 by the U-phase power line 12u. The neutral terminal 22o of the secondary side terminal 22 of the first terminal block 2 is connected to the neutral terminal 41o of the primary side terminal 41 of the second terminal block 4 by the neutral line 12o. The W-phase terminal 22w of the secondary side terminal 22 of the first terminal block 2 is connected to the W-phase terminal 41w of the primary side terminal 41 of the second terminal block 4 by the W-phase power line 12w. Here, The second terminal block 4 corresponds to the second terminal block of the present invention, and the primary side terminal 41 and the secondary side terminal 42 correspond to the third terminal and the fourth terminal of the present invention, respectively.

[0043] An automatic transfer switch 5 is provided on the secondary side of the second terminal block 4. The automatic transfer switch 5 has a first input terminal 51, a second input terminal 52, and an output terminal 53, and automatically switches either the first input terminal 51 or the second input terminal 52 through control to connect it to the output terminal 53. The first input terminal 51 consists of three terminals: a U-phase terminal 51u, a neutral terminal 51o, and a W-phase terminal 51w. The second input terminal 52 consists of three terminals: a U-phase terminal 52u, a neutral terminal 52o, and a W-phase terminal 52w. The output terminal 53 consists of three terminals: a U-phase terminal 53u, a neutral terminal 53o, and a W-phase terminal 53w.

[0044] The secondary terminal 42 of the second terminal block 4 and the first input terminal 51 of the automatic transfer switch 5 are connected by a third commercial power line 13. The third commercial power line 13 consists of three wires: a U-phase power line 13u, a neutral wire 13o, and a W-phase power line 13w. The U-phase terminal 42u of the secondary terminal 42 of the second terminal block 4 is connected to the U-phase terminal 51u of the first input terminal 51 of the automatic transfer switch 5 by the U-phase power line 13u of the third commercial power line 13. The neutral terminal 42o of the secondary terminal 42 of the second terminal block 4 is connected to the neutral terminal 51o of the first input terminal 51 of the automatic transfer switch 5 by the neutral conductor 13o of the third commercial power line 13. The W-phase terminal 42w of the secondary terminal 42 of the second terminal block 4 is connected to the W-phase terminal 51w of the first input terminal 51 of the automatic transfer switch 5 by the W-phase power line 13w of the third commercial power line 13.

[0045] A transformer unit 106 of the power storage system 100, which will be described later, is connected to a second input terminal 52 of the automatic transfer switch 5. A transformer unit breaker 6 is attached to the full-load distribution board 1, and is provided between the transformer unit 106 of the power storage system 100 and the automatic transfer switch 5. The transformer unit breaker 6 breaks the circuit when an abnormal event occurs, such as excessive current flowing from the transformer unit 106. The transformer unit breaker 6 has a primary side terminal 61 and a secondary side terminal 62. As described above, the primary side terminal 61 of the transformer unit breaker 6 is connected to the independent output terminal of the transformer unit 106 of the power storage system 100 by a first transformer unit connecting line 63. The primary terminal 61 of the transformer unit breaker 6 consists of three terminals: a U-phase terminal 61u, a neutral terminal 61o, and a W-phase terminal 61w, and is connected to one end of the U-phase power line 63u, the neutral line 63o, and the W-phase power line 63w of the first transformer unit connection line 63. Here, the transformer unit breaker 6 corresponds to the second breaker of the present invention, and the first transformer unit connection line 63 corresponds to the second power supply line of the present invention.

[0046] The secondary terminal 62 of the transformer unit breaker 6 is connected to the second input terminal 52 of the automatic transfer switch 5 by a second transformer unit connecting wire 64. The secondary terminal 62 of the transformer unit breaker 6 consists of three terminals: a U-phase terminal 62u, a neutral terminal 62o, and a W-phase terminal 62w, and the second transformer unit connecting wire 64 consists of three wires: a U-phase power line 64u, a neutral wire 64o, and a W-phase power line 64w. The U-phase terminal 62u of the secondary terminal 62 of the transformer unit breaker 6 is connected to the U-phase terminal 52u of the second input terminal 52 of the automatic transfer switch 5 by the U-phase power line 64u of the second transformer unit connecting wire 64. The neutral terminal 62o of the secondary terminal 62 of the transformer unit breaker 6 is connected to the neutral terminal 52o of the second input terminal 52 of the automatic transfer switch 5 by the neutral wire 64o of the second transformer unit connecting wire 64. A W-phase terminal 62w of the secondary terminal 62 of the transformer unit breaker 6 is connected to a W-phase terminal 52w of the second input terminal 52 of the automatic transfer switch 5 by a W-phase power line 64w of the second transformer unit connecting line 64.

[0047] The full-load distribution board 1 is connected to the general load 111 via the main distribution board 110, but the full-load distribution board 1 has a main distribution board breaker provided between the automatic changeover switch 5 and the main distribution board 110. The main distribution board breaker 7 is equipped with a primary terminal 71 and a secondary terminal 72. The primary terminal 71 of the main distribution board breaker 7 consists of three terminals: a U-phase terminal 71u, a neutral terminal 71o, and a W-phase terminal 71w. The secondary terminal 72 of the main distribution board breaker 7 consists of three terminals: a U-phase terminal 72u, a neutral terminal 72o, and a W-phase terminal 72w. The output terminal 53 of the full-load distribution board 1 and the primary terminal 71 of the main distribution board breaker 7 are connected by a fourth commercial power line 14. The fourth commercial power line 14 consists of three wires: a U-phase power line 14u, a neutral terminal 14o, and a W-phase power line 14w. The U-phase terminal 53u of the output terminal 53 of the automatic transfer switch 5 is connected to the U-phase terminal 71u of the primary terminal 71 of the main distribution board breaker 7 by the U-phase power line 14u of the fourth commercial power line 14. The neutral terminal 53o of the output terminal 53 of the automatic transfer switch 5 is connected to the neutral terminal 71o of the primary terminal 71 of the main distribution board breaker 7 by the neutral conductor 14o of the fourth commercial power line 14. The W-phase terminal 53w of the output terminal 53 of the automatic transfer switch 5 is connected to the W-phase terminal 71w of the primary terminal 71 of the main distribution board breaker 7 by the W-phase power line 14w of the fourth commercial power line 14. The U-phase terminal 72u, neutral terminal 72o, and W-phase terminal 72w of the secondary terminal 72 of the main distribution panel breaker 7 are connected to the main distribution panel 110 by the U-phase power line 15u, neutral line 15o, and W-phase power line 15w of the fifth commercial power line 15. Here, the main distribution panel breaker 7 corresponds to the third breaker of the present invention.

[0048] As described above, the full-load distribution board 1 accommodates the first terminal block 2, the energy storage system breaker 3, the second terminal block 4, the automatic transfer switch 5, the transformer unit breaker 6, and the main distribution board breaker 7. Although not shown, a control unit that controls the automatic transfer switch 5 is attached to the full-load distribution board 1 adjacent to the automatic transfer switch 5 and is connected to each component via predetermined wiring. The full-load distribution board 1 also has an earth terminal block 8 attached. One end of an earth wire is connected to the earth terminal block 8, and the other end of the earth wire is connected to the earth terminal of the main distribution board 110. These devices and components are attached to the housing of the full-load distribution board 1 via, for example, a back panel.

[0049] Here, as viewed from the front of the full-load distribution board 1, the first terminal block 2, the energy storage system breaker 3, the transformer unit breaker 6, the automatic transfer switch 5, and the main distribution board breaker 7 are arranged, from left to right. These devices are all arranged so that the vertical direction is the incoming line direction. Also, as viewed from the front of the full-load distribution board 1, an electrical path is formed below the first terminal block 2, the energy storage system breaker 3, and the transformer unit breaker 6, connecting the secondary terminal 22 of the first terminal block 2 to the first input terminal 51 of the automatic transfer switch 5. This electrical path includes the second commercial power line 12, the second terminal block 4, and the third commercial power line 13. In the full-load distribution board 1, the second terminal block 4 is provided on this electrical path. As described above, the second terminal block 4 is connected to the first terminal block 2 and the automatic transfer switch 5, but can also be connected to the output terminal of the fuel cell unit 120 (described later) via a first power supply line. One end of the first power supply line 121 is connected to the output terminal of the fuel cell unit 120, and the other end can be connected to the primary terminal 41 or secondary terminal 42 of the second terminal block 4. Furthermore, a CT mounting space 9 is provided in the area between the primary terminal 41 of the second terminal block 4 and the secondary terminal 22 of the first terminal block 2, for arranging a CT 122 that detects the current flowing through the second commercial power line 12. The detection result of the CT 122 is input to the fuel cell unit 120 via a first current detection line 123. Here, the fuel cell unit 120, first power supply line 121, CT 122, CT mounting space 9, and second commercial power line 12 correspond to the power supply device that generates electricity by gas power generation of the present invention, the first power supply line, the current detector, the mounting space, and the wiring for the current detector, respectively.

[0050] (Power supply system) FIG. 2 is an overall configuration diagram of a power supply system 200 including the full-load distribution board 1 and the power storage system 100 shown in FIG. As described above, the full-load distribution board 1 includes the first terminal block 2, the energy storage system breaker 3, and the It includes two terminal blocks 4, an automatic changeover switch 5, a breaker 6 for the transformer unit, and a breaker 7 for the main distribution board.

[0051] The power storage system 100 includes a storage battery unit 102 including a storage battery 101, a PV unit 104 including a solar cell 103, a power conditioner 105, and a transformer unit 106. The storage battery 101 is a chargeable and dischargeable secondary battery, and may be, for example, a lithium-ion battery or various other secondary batteries. The power conditioner 105 performs power conversion such as DC-AC conversion and step-up / step-down. DC power generated by the solar cell 103 is converted into 200V AC power by the power conditioner 105 and output. AC power supplied from a commercial power system is converted into DC power of a predetermined voltage by the power conditioner 105 and charged into the storage battery 101, and DC power discharged from the storage battery 101 is converted into 200V AC power by the power conditioner 105 and output. DC power generated by the solar cell 103 may be converted into a predetermined voltage by the power conditioner 105 and charged into the storage battery 101. The power conditioner 105 performs power conversion for the storage battery unit 102 and the PV unit 104, but a power conditioner that performs power conversion for each may also be provided. The detection result of a CT 107 that detects a current flowing through the first commercial power line 11 is input to the power conditioner 105 via a second current detection line 108. The transformer unit 106 converts the 200V AC power output from the power conditioner 105 into 100V AC power, which is input to a second input terminal 52 of the automatic transfer switch 5 via a first transformer unit connection line 63, a transformer unit breaker 6, and a second transformer unit connection line 64. Here, the power conditioner 105 corresponds to the first power conversion device of the present invention, and the power conditioner 105 and the transformer unit 106 correspond to the second power conversion device of the present invention. The storage battery 101 and the solar cell 103 correspond to the distributed power source of the present invention.

[0052] As described above, the fuel cell unit 120 outputs power generated by the fuel cell and utilizes the heat generated during power generation for purposes such as hot water supply. The AC power output from the fuel cell unit 120 is input to the first input terminal 51 of the automatic transfer switch 5 via the first power supply line 121, the second terminal block 4, and the third commercial power line 13. The fuel cell unit 120 can detect the current supplied from the commercial power system and flowing through the second commercial power line 12 using the CT 122, so that the fuel cell unit 120 can be controlled in accordance with the power supplied from the commercial power system. The fuel cell unit 120 also has an independent output terminal that outputs power generated by the fuel cell unit 120 when the power supply from the commercial power system is interrupted, and can supply power to a load connected to a dedicated power outage outlet via the dedicated power outage outlet connected to this independent output terminal.

[0053] The CT 107 connected to the power conditioner 105 of the power storage system 100 is attached to a first commercial power line 11 connected to the primary side of the first terminal block 2. The CT 122 connected to the fuel cell unit 120 is attached to a second commercial power line 12 connected to the secondary side of the first terminal block 2 and the primary side of the second terminal block 4. By setting the detection locations of the CT 107 and the CT 122 in this way, the power storage system 100 and the fuel cell unit 120 can accurately obtain information for their respective controls without being affected by the other system.

[0054] In this power supply system 200, power supplied from the commercial power system and power supplied from the fuel cell unit 120 are input to a first input terminal 51 of the automatic transfer switch 5 of the full-load distribution board 1, and power supplied from the power storage system 100 is input to a second input terminal 52 of the automatic transfer switch 5 of the full-load distribution board 1. As described above, the power storage system 100 and the fuel cell unit 120 can be controlled independently. For this reason, when power is being supplied from the commercial power system, the first input terminal 51 of the automatic transfer switch 5 is connected to the output terminal 53. By connecting the fuel cell unit 120 to the commercial power grid, the fuel cell unit 120 can be connected to the commercial power grid and can supply the necessary power to the general load 111 according to the power supplied from the commercial power grid and the power consumption of the general load 111. When the power supply from the commercial power grid is stopped, the automatic changeover switch 5 is switched to connect the second input terminal 52 to the output terminal 53, so that power from the power storage system 100 can be supplied to the general load 111. At this time, the fuel cell unit 120 can also recognize the stop of the power supply from the commercial power grid by the CT 122, so it can also supply power to a load connected to a power outage dedicated outlet independently of the power storage system 100.

[0055] In this way, the full-load distribution panel 1 that supplies power from the commercial power system and the storage battery 101 to the general load 111 can be combined with the fuel cell unit 120 to operate stably.

[0056] The power supply system 200 includes a full-load distribution board 1 and a power storage system 100, but may further include a fuel cell unit 120. The power supply device that can be connected to the second terminal block 4 of the full-load distribution board 1 and that can constitute the power supply system 200 is not limited to the fuel cell unit 120. Various power supply devices, such as wind power generators and other PV units, can also be used. While FIG. 2 shows only one fuel cell unit 120 as a power supply device that can be connected to the second terminal block 4 of the full-load distribution board 1, multiple power supply devices connected by a bridging wiring can also be connected to the second terminal block 4. The power storage system 100 includes a storage battery unit 102 and a PV unit 104, but may also include multiple storage battery units and PV units, or may be composed of one or more storage battery units including a storage battery unit. The storage battery 101 and the storage battery unit 102 may be stationary or portable storage batteries and storage battery units installed in an EV or the like. In addition, the power supply system 200 can be configured to include a full-load distribution board 1 and at least one of a storage battery 101 and a solar cell 103, and may include a PV system consisting of one or more PV units instead of the storage system 100.

[0057] In the following, the constituent elements of the present disclosure will be described with the reference numerals in the drawings so that the constituent elements of the present disclosure can be compared with the configurations of the examples. <Appendix 1> an automatic transfer switch (5) having a first input terminal (51) to which power supplied from a commercial power system is input, a second input terminal (52) to which power supplied from a distributed power source (101) is input, and an output terminal (53) to which power supplied to a load (111) is output, and which switches the first input terminal (51) and the second input terminal (52) to connect them to the output terminal; a first terminal block (2) and a second terminal block (4) disposed on an electric circuit, one end of which is connected to the commercial power system and the other end of which is connected to the first input terminal (51); A full load distribution board (1) comprising: the first terminal block (2) has a first terminal (21) to which one end of a first commercial power line (11) having the other end connected to the commercial power system is connected, and a second terminal (22) to which one end of a first distributed power source connection line (33) connecting the distributed power source (101) to the commercial power system and one end of a second commercial power line (12) connecting the first terminal block (2) to the second terminal block (4) are connected; The second terminal block (4) has a third terminal (41) to which the other end of the second commercial power line (12) is connected, and a fourth terminal (42) to which one end of a third commercial power line (13) that connects the second terminal block (4) and the first input terminal (51) is connected, and one end of a first power supply line (121) that supplies power supplied from a power supply device (120) can be connected to either the third terminal (41) or the fourth terminal (42). [Explanation of symbols]

[0058] 1: Full load distribution board 2: 1st terminal block 4:Second terminal block 5: Automatic switching switch 9: CT installation space 21 :Primary side terminal 22 :Secondary side terminal 41 :Primary side terminal 42:Secondary side terminal 33: First storage system connection line 51: First input terminal 52: Second input terminal 53: Output terminal 101: Storage battery 111: General load 121: 1st power supply line

Claims

1. Distributed power sources and a power supply; an automatic transfer switch having a first input terminal to which power supplied from a commercial power system is input, a second input terminal to which power supplied from the distributed power source is input in the event of an abnormality in the commercial power system, and an output terminal from which power supplied to a load is output, the automatic transfer switch switching between the first input terminal and the second input terminal to connect to the output terminal; a first electric circuit having one end connected to the commercial power system and the other end connected to the first input terminal; a second electric circuit having one end connected to the distributed power source and the other end connected to the first electric circuit; a third electric circuit having one end connected to the power supply device and the other end connected to the first electric circuit; a fourth electric path having one end connected to the distributed power source and the other end connected to the second input terminal; A power supply system comprising: a connection position between the first electric circuit and the third electric circuit is located between the automatic transfer switch and a connection position between the first electric circuit and the second electric circuit; a first current detector is provided on the first electric circuit between a connection position of the first electric circuit and the third electric circuit and a connection position of the first electric circuit and the second electric circuit; The power supply device controls the power to be supplied based on the detection result by the first current detector.

2. 2. The power supply system according to claim 1, wherein the first electric circuit is not provided with any device for relaying or interrupting current between the connection point of the first electric circuit and the third electric circuit and the connection point of the first electric circuit and the second electric circuit.

3. Distributed power sources and a power supply; An electric circuit having one end connected to a commercial power system and the other end connected to a main distribution panel; a second electric circuit having one end connected to the distributed power source and the other end connected to the electric circuit; a third electric circuit having one end connected to the power supply device and the other end connected to the electric circuit; A power supply system comprising: The connection position between the electric circuit and the third electric circuit is located between the main distribution board and the connection position between the electric circuit and the second electric circuit, a first current detector is provided in the electric circuit between a connection position of the electric circuit and the third electric circuit and a connection position of the electric circuit and the second electric circuit; a second current detector is provided in the electric circuit on the commercial power system side of a connection position between the electric circuit and the second electric circuit; the power supply device controls the power to be supplied based on the detection result by the first current detector; The distributed power source controls the power to be supplied based on the detection result by the second current detector.

4. an automatic transfer switch provided on the electric circuit and having an input terminal connected to the commercial power system and an output terminal connected to the main distribution board; The power supply system according to claim 3 , wherein the electric circuit is formed by the automatic transfer switch enabling a connection between the input terminal and the output terminal.

5. Distributed power sources and a power supply; an automatic transfer switch having a first input terminal to which power supplied from a commercial power system is input, a second input terminal to which power supplied from the distributed power source is input in the event of an abnormality in the commercial power system, and an output terminal from which power supplied to a load is output, the automatic transfer switch switching between the first input terminal and the second input terminal to connect to the output terminal; a first electric circuit having one end connected to the commercial power system and the other end connected to the first input terminal; a second electric circuit having one end connected to the distributed power source and the other end connected to the first electric circuit; a third electric circuit having one end connected to the power supply device and the other end connected to the first electric circuit; a fourth electric path having one end connected to the distributed power source and the other end connected to the second input terminal; Equipped with a connection position between the first electric circuit and the third electric circuit is located between the automatic transfer switch and a connection position between the first electric circuit and the second electric circuit; A control method for a power supply device in a power supply system, the control method including: providing a first current detector in the first electric circuit between a connection position of the first electric circuit and the third electric circuit and a connection position of the first electric circuit and the second electric circuit; detecting currents supplied from the commercial power system and the distributed power source by the first current detector; The power supply device controls the power to be supplied based on a detection result by the first current detector.

6. Distributed power sources and a power supply; an electric circuit having one end connected to a commercial power system and the other end connected to a main distribution panel; a second electric circuit having one end connected to the distributed power source and the other end connected to the electric circuit; a third electric circuit having one end connected to the power supply device and the other end connected to the electric circuit; Equipped with The connection position between the electric circuit and the third electric circuit is located between the main distribution board and the connection position between the electric circuit and the second electric circuit, a first current detector is provided in the electric circuit between a connection position of the electric circuit and the third electric circuit and a connection position of the electric circuit and the second electric circuit, and a second current detector is provided in the electric circuit on the commercial power system side of the connection position of the electric circuit and the second electric circuit. A control method for a power supply device in the power supply device controls the power to be supplied based on the detection result by the first current detector; The distributed power source controls the power to be supplied based on a detection result by the second current detector.

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