JP2020022220A - Power supply system and method for constructing power supply system - Google Patents

Abstract

To provide a power supply system that facilitates the change between the configuration of collective power receiving and the configuration of house-to-house power receiving, and a method for constructing the power supply system.SOLUTION: A power supply system 100 comprises: a distribution board 10 and a dispersion power supply 61. The distribution boad 10 includes a master breaker 31, an interconnection breaker 34, a transaction meter 21, and a terminal strip 50. The master breaker 31 opens or closes the connection between a power network 80 and transaction meter 21. The power strip 50 can be connected to a house load 42 of an apartment house 1 at one end and is connected to the transaction meter 21 at the other end. The transaction meter 21 is connected to the master breaker 31 at one end, can be connected to a common area load 43 of the apartment house 1 at the other end, and is connected to the interconnection breaker 34 and terminal strip 50. The interconnection breaker 34 opens and closes the connection between the transaction meter 21, the terminal strip 50 and common area load 43, and the distribution power supply. The terminal strip 50 can be connected to one of both ends of the transaction meter 21.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a power supply system and a method of constructing the power supply system.

  2. Description of the Related Art There is known a configuration in which collective power reception is performed in an apartment house (see, for example, Patent Document 1).

JP 2017-17779 A

  There is a case where the configuration of collective power reception is changed to the configuration of each house power reception.

  An object of the present disclosure is to provide a power supply system and a method of constructing a power supply system that facilitate a change between a configuration of collective power reception and a configuration of power reception in each door.

  A power supply system according to an embodiment of the present disclosure includes a drop-in board and a distributed power supply. The drop-in board includes a main breaker, an interconnection breaker, a transaction meter, and a terminal block. The master breaker is connectable at one end to a power grid and connected to the trading meter at the other end, and opens and closes between the power grid and the trading meter. The terminal block is connectable at one end to the dwelling unit load of the apartment house and at the other end to the transaction meter. The transaction meter has one end connected to the main breaker, the other end connectable to a common unit load of the apartment house, and is connected to the interconnection breaker and the terminal block. The interconnection breaker is connected to the distributed power supply at one end, and can be connected to the common unit load at the other end, and is connected to the transaction meter and the terminal block, the transaction meter, the terminal block, and Opening and closing between the common unit load and the distributed power supply. The terminal block is connectable to either end of the transaction meter. The distributed power supply supplies power to at least one of the dwelling unit load and the common unit load when the interconnection breaker is in a closed state, and supplies excess power to the power grid in a reverse flow.

  In a method for constructing a power supply system according to an embodiment of the present disclosure, the power supply system includes a distributed power supply and is connected to a power network. In the construction method, a main breaker connected to the power grid at one end and connected to a transaction meter at the other end, and an interconnection connected to the distributed power supply at one end and connected to the transaction meter at the other end. Open the breaker. In the construction method, one end of a terminal block connected between the transaction meter and the interconnection breaker is disconnected. In the construction method, one end of the terminal block is connected between the transaction meter and the master breaker. In the construction method, the main breaker and the interconnection breaker are closed. The terminal block is connectable to either end of the transaction meter.

  According to the power supply system and the construction method of the power supply system according to an embodiment of the present disclosure, it is easy to change between the configuration of the collective power reception and the configuration of the individual power reception.

It is a block diagram showing the example of composition of the power supply system concerning one embodiment. FIG. 2 is a block diagram illustrating a configuration example in which wiring of the power supply system in FIG. 1 is switched. It is a flowchart which shows an example of the procedure of the construction method of a power supply system. It is a block diagram of a power supply system according to a comparative example.

  As shown in FIG. 1, a power supply system 100 according to one embodiment may be provided in an apartment house 1. The apartment house 1 includes a power supply system 100, a dwelling unit load 42, and a common unit load 43. The power supply system 100 is connected to a power grid 80 and receives power from the power grid 80. The power supply system 100 is connected to the dwelling unit load 42 and the common unit load 43, and supplies power to the dwelling unit load 42 and the common unit load 43.

  The power supply system 100 includes a drop-in board 10, a photovoltaic power generation facility (hereinafter, also referred to as PV) 61, and a power conditioner (hereinafter, also referred to as PCS) 62. The power supply system 100 supplies the power output from the PV 61 and the PCS 62 to at least one of the dwelling unit load 42 and the common unit load 43. The power supply system 100 sells surplus power to the power network 80 when the power output from the PV 61 and the PCS 62 exceeds the power consumption.

  The PV 61 may be replaced with another renewable energy power generation facility such as a wind power generation facility. The PCS 62 controls the power output from the PV 61 by, for example, converting DC power output from the PV 61 into AC power. The PCS 62 may include an inverter, a converter, and the like. A configuration in which the PV 61 or a combination of the PV 61 and the PCS 62 is also referred to as a distributed power source. The distributed power source may include a storage battery and a fuel cell. The number of PVs 61 and PCSs 62 is not limited to one, and may be two or more. For example, the PV 61 can be provided on both the roof of the apartment house 1 and the roof of the parking lot of the apartment house 1.

  The apartment house 1 may be in various forms such as an apartment, an apartment, or a maisonette. The dwelling unit load 42 is an electric power load provided to each unit of the apartment house 1. The dwelling unit load 42 may be, for example, an electric device such as a lighting fixture, a refrigerator, a television, or an air conditioner used in each house. The common part load 43 is an electric power load provided in the common part of the apartment house 1. The common part may be, for example, a corridor or stairs of the apartment house 1. The common unit load 43 may include devices provided in the common unit, for example, lighting equipment such as an external light, a septic tank blower power supply, emergency equipment such as a fire alarm, and other equipment such as an air conditioner. The dwelling unit load 42 and the common unit load 43 are collectively referred to as a load 40. The number of dwelling unit loads 42 is not limited to two, and may be three or more. The number of shared unit loads 43 is not limited to one, and may be two or more.

  The pull-in board 10 includes a transaction meter 21 and a first breaker 31. The pull-in board 10 may further include a first terminal 11, a first node 71, and a second node 72. The drop-in board 10 can be connected to the power grid 80 via the first terminal 11. The first breaker 31 has one end connected to the power network 80 via the first terminal 11 and the other end connected to the first node 71. Transaction meter 21 is connected at one end to a first node 71 and at the other end to a second node 72. That is, the first breaker 31 is connectable to the power grid 80 at one end, and is connected to the transaction meter 21 at the other end. The first breaker 31 is connected in series between the first terminal 11 connected to the power grid 80 and the transaction meter 21. First breaker 31 opens and closes between power grid 80 and transaction meter 21. The first breaker 31 is also called a main breaker.

  Transaction meter 21 is connected to power grid 80 when first breaker 31 is closed. The transaction meter 21 measures the amount of power that the drop-in board 10 collectively receives from the power network 80. The transaction meter 21 is managed by a power company whose management entity of the apartment house 1 has concluded a collective power receiving contract. Transaction meter 21 may be a watt hour meter with a test. A watt-hour meter with a test is also called a test meter. The electric power company may charge the management entity of the apartment house 1 with the electricity fee based on the measurement result of the transaction meter 21.

  The drop-in board 10 further includes a terminal block 50. The drop-in board 10 may further include a second terminal 12, a dwelling unit meter 22, and a second breaker 32. The drop-in board 10 is connectable to the dwelling unit load 42 via the second terminal 12. The second breaker 32 has one end connected to the second terminal 12 and the other end connected to the dwelling unit meter 22. The dwelling unit meter 22 has one end connected to the second breaker 32 and the other end connected to the terminal block 50. The terminal block 50 has one end connected to the dwelling unit meter 22 and the other end connected to the transaction meter 21 via the second node 72. That is, the terminal block 50 is connectable to the dwelling unit load 42 at one end, and is connected to the transaction meter 21 at the other end.

  When the drop-in board 10 is connected to a plurality of dwelling unit loads 42, the drop-in board 10 includes the second terminal 12, the second breaker 32, and the dwelling unit meter 22 connected to each dwelling unit load 42. The terminal block 50 has one end connected to the second node 72 and the other end connected to the dwelling unit meter 22.

  The drop-in board 10 may further include a third terminal 13, a common unit meter 23, and a third breaker 33. The drop-in board 10 can be connected to the common unit load 43 via the third terminal 13. The third breaker 33 has one end connected to the third terminal 13 and the other end connected to the common unit meter 23. The common unit meter 23 has one end connected to the third breaker 33 and the other end connected to the transaction meter 21 via the second node 72.

  The pull-in board 10 may further include a fourth terminal 14 and a fourth breaker 34. The pull-in board 10 can be connected to the PV 61 and the PCS 62 via the fourth terminal 14. The fourth breaker 34 is connected at one end to the fourth terminal 14, and at the other end to the transaction meter 21, the common use meter 23, and the terminal block 50 via the second node 72. The fourth breaker 34 is also called an interconnection breaker.

  The power supplied from the power network 80 is branched at the second node 72 and supplied to the common unit load 43 and each dwelling unit load 42 connected to the terminal block 50. The electric power supplied from the PCS 62 is branched at the second node 72 and is self-consumed by being supplied to the common unit load 43 and each dwelling unit load 42 connected to the terminal block 50. Surplus power that is not consumed by itself among the power supplied from the PCS 62 is sold to the power network 80 via the transaction meter 21. Transaction meter 21 measures the amount of power supplied from power network 80 and the amount of power sold to power network 80 from PCS 62.

  The dwelling unit load 42 receives power from at least one of the power grid 80 and the PCS 62 via the second node 72 and the terminal block 50. When the drop-in board 10 is connected to a plurality of dwelling unit loads 42, the electric power supplied to each dwelling unit load 42 branches at the terminal block 50. The dwelling unit meter 22 measures the amount of power received by the dwelling unit load 42. The dwelling unit meter 22 may be managed by the management entity of the apartment house 1. The management entity of the apartment house 1 may charge the resident of each house an electricity fee based on the measurement result of the dwelling unit meter 22. The dwelling unit meter 22 may be a watt-hour meter with a test. When the dwelling unit meter 22 is a watt hour meter with a test, the reliability of the measured value of the amount of power received by the dwelling unit load 42 can be further enhanced.

  The common unit load 43 receives power from at least one of the power network 80 and the PCS 62 via the second node 72. The common unit meter 23 measures the amount of power received by the common unit load 43. The common unit meter 23 may be managed by the management entity of the apartment house 1. The common unit meter 23 may be a watt hour meter with a test. When the common unit meter 23 is a watt hour meter with a test, the reliability of the measured value of the electric energy received by the common unit load 43 can be further enhanced.

  The terminal block 50 has a connection terminal connected to each dwelling unit load 42. The terminal block 50 connects each dwelling unit load 42 to the electric power network 80 via the second node 72, the transaction meter 21, and each connection terminal. That is, the terminal block 50 can distribute the power received from at least one of the power network 80 and the PCS 62 to each connection terminal. The terminal block 50 has a switch connected to each connection terminal. The switch electrically connects the power network 80 and each dwelling unit load 42 in the closed state, and electrically disconnects the power network 80 and each dwelling unit load 42 in the open state. The terminal block 50 can change the state of each switch independently. The terminal block 50 can cause some switches to transition to a closed state and other switches to transition to an open state. The switch may be constituted by a lever. The terminal block 50 may cause the switch to transition between a closed state and an open state by operating a lever of each switch. The configuration of the switch is not limited to the lever, and may be various modes such as a button. When the terminal block 50 has a switch, the second breaker 32 need not be provided.

  The authority to open and close the first breaker 31 may be owned by a power company that supplies power to the power network 80. In other words, the first breaker 31 may be opened and closed by a power company that supplies power to the power network 80. In the configuration illustrated in FIG. 1, when the first breaker 31 is opened, power supply to the transaction meter 21 is stopped. In this case, the power company cannot grasp the state of the transaction meter 21. The electric power company may restrict the main body other than the electric power company such as the management main body of the apartment house 1 from opening the first breaker 31. For example, the first breaker 31 may be protected by a cover or the like so that an entity other than the power provider cannot open and close. The power company may prohibit an entity other than the power company from opening and closing the first breaker 31 by a contract. The power company may permit opening and closing of the first breaker 31 to an entity other than the power company. When the power company has the authority to open and close the first breaker 31, the management of the transaction meter 21 is facilitated.

  In the configuration illustrated in FIG. 1, it is assumed that the management entity of the apartment house 1 has concluded a collective power receiving contract for the apartment house 1 with a power company that supplies power to the power network 80. When the collective power receiving contract for the apartment house 1 is concluded, the drop-in board 10 collectively receives power from the power network 80 and supplies power to each load 40. The electric power company charges an electricity fee to the management entity of the apartment house 1 based on the amount of power that the apartment house 1 collectively receives from the power network 80. The management entity of the apartment house 1 charges the resident of each house the electricity rate based on the electricity rate charged by the electric power company and the measurement result of the dwelling unit meter 22. The management entity of the apartment house 1 may further charge the resident of each house an electricity fee in consideration of the amount of surplus electricity sold. By doing so, the degree of freedom in collecting electricity bills can be increased.

  The power receiving contract relating to the apartment house 1 includes not only a lump-sum power receiving contract but also a household power receiving contract in which each resident of the apartment house 1 individually contracts with a power company. In a case where the house-to-house power receiving contract is adopted instead of the collective power receiving contract in the apartment house 1, the apartment house 1 may include the drop-in board 10 illustrated in FIG.

  The drop-in board 10 included in the power supply system 100 illustrated in FIG. 2 is different from the drop-in board 10 illustrated in FIG. 1, in that the transaction meter 21 includes a common use transaction meter 21a and a dwelling unit transaction meter 21b. Is provided. The common unit transaction meter 21a measures the electric power supplied from the power network 80 to the common unit load 43. The common-unit transaction meter 21a is managed by a power company whose management entity of the apartment house 1 has concluded a power receiving contract. The dwelling unit transaction meter 21b measures the power supplied from the power network 80 to the dwelling unit load 42. The dwelling unit transaction meter 21b is managed by a power company to which a resident of each unit has concluded a power receiving contract. The common use unit transaction meter 21a and the dwelling unit transaction meter 21b may be watt hour meters with verification.

  When making a power receiving contract with a resident of each house, the power company charges the resident of each house with electricity by acquiring the amount of power consumption of each house. By providing the draw-in board 10 with the dwelling unit transaction meter 21b, the electric power company can acquire the power consumption of each house by the dwelling unit transaction meter 21b. As a result, the power company can make a power receiving contract for each house in the apartment house 1 including the power supply system 100 in FIG.

  The draw-in board 10 included in the power supply system 100 of FIG. 2 is different from the draw-in board 10 of FIG. 1 in the following three points. As a first modification, one end of the terminal block 50 is connected to the second node 72 in FIG. 1 while being connected to the first node 71 in FIG. As a second modification, the common unit meter 23 is removed, and the third breaker 33 is connected to the second node 72. As a third modification, the dwelling unit meter 22 is replaced with a dwelling unit transaction meter 21b. The common unit transaction meter 21a in FIG. 2 is the same as the transaction meter 21 in FIG. When the dwelling unit meter 22 is a watt-hour meter with a test, the dwelling unit transaction meter 21b in FIG. 2 may be the same as the dwelling unit meter 22 in FIG. 1 without replacement. In the present embodiment, the dwelling unit transaction meter 21b may be a watt-hour meter with a test in order to accurately charge the electricity rate because the drop-in board 10 is used when each house receives a power receiving contract. When the drop-in board 10 of FIG. 1 is changed to the drop-in board 10 of FIG. 2, the transaction meter 21 of the drop-in board 10 of FIG. 1 may be used as any one of the dwelling unit transaction meters 21b of FIG. Thereby, the number of newly prepared dwelling unit transaction meters 21b, which are wattmeters with test, can be reduced.

  In the power supply system 100 according to the present embodiment, the terminal block 50 can be disconnected from the second node 72 and connected to the first node 71 on the side connected to the second node 72. In other words, the terminal block 50 can be connected to any one of both ends of the transaction meter 21. By doing so, the change operation according to the change point 1 is easily performed.

  The drop-in board 10 included in the power supply system 100 according to the present embodiment includes the first breaker 31 between the first terminal 11 and the first node 71. The change work according to the change points 1 and 2 is performed as a power outage work by opening the first breaker 31 and the fourth breaker 34. As a result, work safety is improved.

  The drop-in board 10 included in the power supply system 100 according to the present embodiment includes the terminal block 50 between the second node 72 and the dwelling unit meter 22. The change work according to the change point 3 is performed as a power outage work when the terminal block 50 is turned off. As a result, work safety is improved.

  The drop-in board 10 whose configuration is easily changed can easily cope with each of the collective power receiving contract and each house power receiving contract. As a result, the degree of freedom of the power receiving contract for the apartment house 1 is increased. The owner of the apartment house 1 may change the power receiving contract for the apartment house 1 based on various conditions such as the selling price of the surplus power or the electricity rate of the received power. By doing so, the profit of the owner of the apartment house 1 can be increased.

  The drop-in board 10 included in the power supply system 100 according to the present embodiment is configured such that the power generated by the PV 61 is self-consumed at least by the common unit load 43. Of the power generated by the PV 61, the power obtained by subtracting the power consumed by the home becomes surplus power and flows backward to the power network 80. As a result, surplus power is sold to a power company. The draw-in board 10 is provided with a meter corresponding to the sale of surplus power as the transaction meter 21. If the change in the wiring is changed to a configuration of a full power sale in which all of the power generated by the PV 61 is sold to the power grid 80, the transaction meter 21 is changed to a meter corresponding to the full power sale. Need to be In the drop-in board 10 included in the power supply system 100 according to the present embodiment, the fourth terminal 14 is connected to the second node irrespective of whether the terminal block 50 is connected to the first node 71 or the second node 72. It may be connected to at least the third terminal 13 via 72. Since the fourth terminal 14 is connected to at least the third terminal 13, at least a part of the power generated by the PV 61 is supplied to the common unit load 43. That is, even if the wiring is changed, the power supply system 100 does not have the configuration of the full power sale. By doing so, the transaction meter 21 does not have to be replaced with a meter corresponding to the full sale of electricity. When there is no need to replace the meter, there is no need to secure a space for replacing the meter in the drop-in board 10. As a result, downsizing or cost reduction of the drop-in board 10 can be realized.

  The power supply system 100 can be easily changed to one of the configuration of collective power reception and the configuration of each house power reception. The subject who carries out the change work may carry out the construction method according to the procedure shown in the flowchart of FIG. The subject of executing the change work may be an electric contractor or the like. The entity that performs the change work is also called a worker.

  The operator opens the first breaker 31 (main breaker) and the fourth breaker 34 (interconnection breaker) (step S1). When the first breaker 31 is opened, the pull-in board 10 is electrically disconnected from the power grid 80. When the fourth breaker 34 is opened, the pull-in board 10 is electrically disconnected from the PV 61 and the PCS 62. That is, when the first breaker 31 and the fourth breaker 34 are in the open state, the change work related to the pull-in board 10 is performed as a power outage work. On the other hand, when at least one of the first breaker 31 and the fourth breaker 34 is in the closed state, the change work on the drop-in board 10 is performed as a live-line work.

  The worker removes the common unit meter 23, and connects one end of the third breaker 33 and the second node 72 by wiring (step S2).

  The operator separates the terminal block 50 from the second node 72 (Step S3).

  The worker connects the terminal of the terminal block 50 separated from the second node 72 to the first node 71 (step S4). Since the terminal block 50 is connected to the first node 71, the transaction meter 21 does not measure the amount of power supplied to the dwelling unit load 42 but measures the amount of power supplied to the common unit load 43. I do. In this case, the transaction meter 21 may be referred to as a common unit transaction meter 21a.

  The operator performs the procedure of steps S2 to S4 as a power failure operation.

  The operator closes the first breaker 31 (main breaker) and the fourth breaker 34 (interconnection breaker) (step S5). When the first breaker 31 is closed, the pull-in board 10 is electrically connected to the power grid 80. By closing the fourth breaker 34, the pull-in board 10 is electrically connected to the PV 61 and the PCS 62.

  The operator opens the switch of the terminal block 50 (step S6). When the switch of the terminal block 50 is opened, the dwelling unit meter 22 and the dwelling unit load 42 connected to the switch are electrically disconnected from the power grid 80 and the PV 61 and the PCS 62. That is, when the switch of the terminal block 50 is in an open state, the change operation regarding the configuration connected to the switch is performed as a power failure operation. The operator may open only the switches connected to the configuration to be changed. In this way, the change operation is performed as a power outage operation while power is supplied to a configuration that is not the target of the change operation. As a result, the safety of the change work is improved, and the convenience of the resident is improved.

  The operator removes the dwelling unit meter 22 (Step S7).

  The worker attaches the dwelling unit transaction meter 21b instead of the dwelling unit meter 22 (step S8).

  The operator performs the procedures of steps S7 and S8 as a power outage operation.

  The operator closes the switch of the terminal block 50 (step S9). When the switch on the terminal block 50 is closed, the dwelling unit transaction meter 21b and the dwelling unit load 42 connected to the switch are electrically connected to the power grid 80, the PV 61, and the PCS 62.

  After step S9, the operator ends the procedure of the flowchart in FIG. The worker may perform the operations of steps S6 to S9 for each house, or may collectively perform the work for a plurality of dwelling units.

  Next, a comparative example for one embodiment will be described. The power supply system 900 according to the comparative example illustrated in FIG. In the drop-in board 90 according to the comparative example, the transaction meter 21 is connected to the first terminal 11 without passing through the first breaker 31. In this case, the wiring connected to the dwelling unit load 42 is disconnected from the second node 72 and connected to the first node 71 in order to connect the transaction meter 21 like the common-unit transaction meter 21a illustrated in FIG. The operation is performed as a live line operation. The wiring change operation in the power supply system 100 according to the present embodiment can be performed as a power outage operation by opening the first breaker 31. As a result, the wiring change operation in the power supply system 100 according to the present embodiment is performed more safely than the wiring change operation in the power supply system 900 according to the comparative example.

  In the drop-in board 90 according to the comparative example shown in FIG. 4, the dwelling unit meter 22 is connected to the second node 72 without passing through the terminal block 50. In this case, the operation of changing the dwelling unit meter 22 to the dwelling unit transaction meter 21b is performed as a power outage operation by opening the first breaker 31 and the fourth breaker 34. When the first breaker 31 is in the open state, the electric power of the electric power grid 80 is not supplied to the common unit load 43 and each dwelling unit load 42. The power supply system 100 according to the present embodiment can individually turn off the dwelling unit meters 22 with the terminal block 50. By doing in this way, while the power of the power network 80 is being supplied to the common unit load 43 and the dwelling unit load 42 that is not the target of the operation, the change operation of the dwelling unit meter 22 that is the target of the operation is interrupted. Can be implemented as work. As a result, the work of changing the dwelling unit meter 22 is easily performed.

  The diagram describing the embodiment according to the present disclosure is a schematic diagram. The dimensional ratios and the like in the drawings do not always match actual ones.

  Although the embodiments according to the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes or modifications based on the present disclosure. Therefore, it should be noted that these variations or modifications are included in the scope of the present disclosure. For example, functions included in each component and the like can be rearranged so as not to be logically inconsistent, and a plurality of components and the like can be combined into one or divided.

  For example, two power lines connected to the terminal block 50 may be prepared. The first power line is connected at one end to the first node 71 and at the other end directly to the terminal block 50. The second power line is connected at one end to the second node 72 and at the other end directly to the terminal block 50. That is, the terminal block 50 includes a first connection terminal connected to the first power line and a second connection terminal connected to the second power line. Further, the terminal block 50 has a switch function that allows each connection terminal connected to each dwelling unit load 42 to be connected to either the first connection terminal or the second connection terminal. As a result, one dwelling unit can be supplied with power under a lump-sum power receiving contract, and another dwelling unit can be supplied with power under an individual power receiving contract, thereby increasing the degree of freedom of resident selection. .

  In addition, the procedure of the construction method of the power supply system is not limited to the procedure of the flowchart illustrated in FIG. 3, and the order of each step may be changed. For example, steps S1 to S5 may be performed after steps S6 to S8 are performed first. If the terminal block 50 does not include a switch, step 5 may be performed after step S8 has been performed on all dwelling units. At this time, steps S6 and S9 are not performed.

  Further, the procedure of the flowchart shown in FIG. 3 is a procedure for changing from the configuration of collective power reception to the configuration of each house power reception. However, the configuration of each dwelling unit power reception may be changed to the configuration of collective power reception. Changes from the procedure of the flowchart shown in FIG. 3 will be described below. In the operation of step S2, the worker installs the common unit meter 23 between one end of the third breaker 33 and the second node 72, and connects the common unit meter 23 to the third breaker 33 and the second node 72. Change to work. Next, in the operation of step S3, the operator changes the operation to disconnect the terminal block 50 from the first node 71. Next, in the operation of step S4, the operator changes the operation of connecting the terminal of the terminal block 50 separated from the first node 71 to the second node 72. Next, in the operation of step S7, the operator changes the operation to remove the dwelling unit transaction meter 21b. Finally, in the work of step S8, the worker changes to a work of attaching the dwelling unit meter 22 instead of the dwelling unit transaction meter 21b. By performing the wiring change operation as described above, the power supply system having the configuration of each power reception shown in FIG. 2 can be changed to the power supply system having the configuration of collective power reception shown in FIG.

  In the present disclosure, descriptions such as “first” and “second” are identifiers for distinguishing the configuration. In the configurations distinguished by the description such as “first” and “second” in the present disclosure, the numbers in the configurations can be exchanged. For example, the first terminal can exchange "first" and "second" as identifiers with the second terminal. The exchange of identifiers takes place simultaneously. Even after the exchange of the identifier, the configuration is distinguished. The identifier may be deleted. The configuration from which the identifier is deleted is distinguished by a code. Do not use the interpretation of the order of the configuration or the grounds for the existence of an identifier with a small number based only on the description of the identifier such as “first” and “second” in the present disclosure.

DESCRIPTION OF SYMBOLS 1 Apartment house 10 Drop-in board 11-14 1st-4th terminal 21 Transaction meter 21a Common use transaction meter 21b Residential transaction meter 22 Residential meter 23 Common use meter 31-34 1st-4th breaker 40 Load 42 Residential load 43 Shared Part load 50 Terminal block 61 Solar power generation equipment (PV)
62 Power Conditioner (PCS)
71 first node 72 second node 80 power network 100 power supply system

Claims (8)

With a drop-in board and a distributed power supply,
The drop-in board includes a main breaker, an interconnection breaker, a transaction meter, and a terminal block,
The master breaker is connectable to a power grid at one end and connected to the transaction meter at the other end, and opens and closes between the power network and the transaction meter,
The terminal block is connectable at one end to a dwelling unit load of an apartment house, and is connected to the transaction meter at the other end.
The transaction meter is connected at one end to the main breaker, and at the other end is connectable to a common area load of the apartment house, and is connected to the interconnection breaker and the terminal block;
The interconnection breaker is connected to the distributed power supply at one end, and can be connected to the common unit load at the other end, and is connected to the transaction meter and the terminal block, the transaction meter, the terminal block, and Open and close between the common unit load and the distributed power supply,
The terminal block is connectable to any one of both ends of the transaction meter,
The power supply system, wherein the distributed power supply supplies power to at least one of the dwelling unit load and the common unit load when the interconnection breaker is in a closed state, and supplies excess power to the power grid in a reverse flow.   2. The power supply system according to claim 1, wherein the distributed power supply is connected to at least the common unit load regardless of whether the terminal block is connected to either end of the transaction meter.   3. The case where the terminal block is connected between the master breaker and the transaction meter, further comprising a dwelling unit transaction meter connected between the terminal block and the dwelling unit load, 3. A power supply system as described.   The power supply system according to any one of claims 1 to 3, wherein the master breaker is opened and closed by a power company that supplies power to the power grid. The terminal block has a first connection terminal connected between the transaction meter and the master breaker, a terminal connectable to the transaction meter and the common unit load, and a terminal connectable to the distributed power supply. A second connection terminal connected between at least one of the second connection terminals,
The power supply system according to any one of claims 1 to 4, wherein the dwelling unit load is connected to one of the first connection terminal and the second connection terminal. A method for constructing a power supply system comprising a distributed power supply and connected to a power grid,
The main breaker connected to the power grid at one end and connected to the trading meter at the other end, and the interconnected breaker connected to the distributed power supply at one end and connected to the trading meter at the other end. West,
Disconnect one end of a terminal block connected between the transaction meter and the interconnection breaker,
Connecting one end of the terminal block between the transaction meter and the master breaker;
Closing the master breaker and the interconnection breaker,
The method for constructing a power supply system, wherein the terminal block is connectable to any one of both ends of the transaction meter. Open the switch of the terminal block,
Remove the dwelling unit meter connected to the switch in the open state of the terminal block,
The construction method of the power supply system according to claim 6, wherein a dwelling unit transaction meter is attached instead of the dwelling unit meter.   8. The common meter according to claim 6, wherein the common meter connected to the transaction meter, the interconnection breaker, and the terminal block is removed while the master breaker and the interconnection breaker are in an open state. 9. Power supply system construction method.

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