Energy storage system and initial setting method for energy storage system

Abstract

To provide a power storage system which is easy to manage and reduces a burden of model changing, and a method for initializing the power storage system.SOLUTION: The power storage system includes: a storage battery; a power conversion unit having a first power input / output terminal and a second power input / output terminal connected to the storage battery; a terminal block having a plurality of external input / output terminals, each of which is connectable with a cable; a model selection unit that selects any model from among a plurality of models, each of which follows different specifications; a switching unit that switches connection between the plurality of external input / output terminals and the first power input / output terminal; and a control unit that controls the power conversion unit and the switching unit to operate as the model set by the model selection unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a power storage system and an initial setting method for the power storage system. [Background technology]

[0002] An increasing number of homes are installing battery storage systems. These systems come in two types: standalone models, which simply charge the battery with electricity from the grid, and hybrid models, which require a solar power generation system to be connected.

[0003] A standalone model receives power from, for example, a 100V outlet and charges the storage battery, keeping it constantly fully charged. During a power outage, the battery discharges electricity. In other words, a standalone model is designed for power backup. The standalone model's specifications do not allow it to be connected to the grid. Therefore, standalone models are easy to install and do not require any special construction work.

[0004] On the other hand, hybrid models are assumed to be connected to a solar power generation system and grid-connected. Therefore, hybrid models require a current sensor to detect reverse power flow. Also, charging a hybrid model from a 100V outlet is not possible, and work on the distribution board is required.

[0005] An example of such a hybrid model is described in Patent Document 1 below. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-103198 Summary of the Invention [Problem to be solved by the invention]

[0007] The energy storage system disclosed in Patent Document 1 is premised on being connected to a grid. Therefore, even if, for example, solar power generation is not to be introduced immediately, construction and operation to prevent reverse power flow are required. On the other hand, if a standalone model is introduced, the energy storage system must be changed from a standalone model to a hybrid model when solar power generation is introduced. Both of these are a significant burden for users. In addition, manufacturers and sellers of energy storage systems must distinguish between standalone models and hybrid models, which creates the problem of complicated model management.

[0008] Therefore, an object of this disclosure is to provide a power storage system that is easy to manage and requires only a small burden when changing models, and a method for initial setting of the power storage system. [Means for solving the problem]

[0009] A power storage system according to a first aspect of this disclosure includes a storage battery, a power conversion unit having a first power input / output terminal and a second power input / output terminal connected to the storage battery, a terminal block having a plurality of external input / output terminals to each of which a cable can be connected, a model selection unit that selects any one of a plurality of models each conforming to different specifications, a switching unit that switches connections between the plurality of external input / output terminals and the first power input / output terminal, and a control unit that controls the power conversion unit and the switching unit so that the system operates as the model set by the model selection unit.

[0010] An initial setting method for a power storage system according to a second aspect of this disclosure is an initial setting method for a power storage system that can operate with any of a plurality of models, and includes the steps of: in response to the start of a trial run of the power storage system, having an operator select one of a plurality of models; determining whether the specifications of the specified model are consistent with the state of cable connection to the external input / output terminals of the power storage system; in response to a positive determination in the determining step, initially setting the power storage system to operate as the model selected by the operator and terminating the trial run; and in response to a negative determination in the determining step, notifying the operator that the cable connection is not consistent with the model specified by the operator and interrupting the trial run.

[0011] According to this disclosure, it is possible to provide a power storage system that is easy to manage and requires only a small burden when changing models, and a method for initializing the power storage system. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram showing the configuration of electrical wiring in a home including a power storage system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a circuit diagram showing the configuration of the general load distribution board shown in FIG. [Figure 3] FIG. 3 is a circuit diagram showing the configuration of the distribution board for the electricity storage system shown in FIG. [Figure 4] FIG. 4 is a block diagram showing the configuration of the power storage system shown in FIG. [Figure 5] FIG. 5 is a block diagram showing the configuration of the PCS (Power Conditioning System) unit shown in FIG. [Figure 6] FIG. 6 is a diagram showing wiring when the power storage system according to the embodiment of the present disclosure is used as a stand-alone model. [Figure 7] FIG. 7 is a diagram showing wiring when the power storage system according to the embodiment of the present disclosure is used as a grid-connected model that does not include photovoltaic power generation. [Figure 8] FIG. 8 is a diagram showing wiring when the power storage system according to the embodiment of the present disclosure is used as a 100V grid-connected model including photovoltaic power generation. [Figure 9] FIG. 9 is a diagram showing wiring when the power storage system according to the embodiment of the present disclosure is used as a 200V grid-connected model including photovoltaic power generation. [Figure 10] FIG. 10 is a diagram illustrating the appearance of a terminal block of a power storage system according to an embodiment of the present disclosure. [Figure 11] FIG. 11 is a diagram showing, in a tabular format, the operation of each model of the power storage system according to the embodiment of the present disclosure. [Figure 12] FIG. 12 is a flowchart showing a control structure and screen transitions of a test run program at the time of initial setup, which is executed by the remote controller of the power storage system according to the embodiment of the present disclosure. [Figure 13] FIG. 13 is a flowchart showing a control structure and screen transitions of a test run program executed by the remote controller of the power storage system according to an embodiment of the present disclosure. [Figure 14] FIG. 14 is a flowchart showing a control structure and screen transitions of a test run program executed by the remote controller of the power storage system according to an embodiment of the present disclosure. [Figure 15] FIG. 15 is a flowchart showing a control structure of a program executed by the PCS unit of the power storage system according to an embodiment of the present disclosure during test operation. [Figure 16] FIG. 16 is a block diagram showing a circuit configuration of an MCU (Micro Controller Unit) that controls a PCS unit of a power storage system according to an embodiment of the present disclosure. [Figure 17] FIG. 17 is a block diagram showing a control program startup process during operation of the power storage system according to an embodiment of the present disclosure. [Figure 18] FIG. 18 is a block diagram showing a start-up process of a control program during operation of a power storage system according to a modification of this disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Description of the embodiments of this disclosure] In the following description and drawings, the same parts are designated by the same reference numerals, and therefore detailed description thereof will not be repeated.

[0014] The contents of the embodiments of the present disclosure will be listed and described below. At least some of the embodiments described below may be combined in any combination.

[0015] (1) A power storage system according to a first aspect of this disclosure may include a storage battery, a power conversion unit having a first power input / output terminal and a second power input / output terminal connected to the storage battery, a terminal block having a plurality of external input / output terminals to each of which a cable can be connected, a model selection unit that selects any one of a plurality of models each conforming to different specifications, a switching unit that switches connections between the plurality of external input / output terminals and the first power input / output terminal, and a control unit that controls the power conversion unit and the switching unit so that the system operates as the model set by the model selection unit.

[0016] When the model selection unit selects a model, the switching unit switches the connection between the external input terminal and the first power input / output terminal according to the selected model under the control of the control unit, and the power conversion unit operates as the model set by the model selection unit under the control of the control unit.

[0017] (2) The multiple models may include at least a stand-alone model, a first grid-connected model that connects to grid power at a first voltage, and a second grid-connected model that is connected to an AC power source of a first voltage different from the grid power and connects to grid power at the first voltage.

[0018] The power storage system operates as any one of a stand-alone model, a first grid-connected model, and a second grid-connected model.

[0019] (3) The plurality of models may further include a third grid-connected model that is connected to an AC power source and is connected to grid power at a second voltage different from the first voltage.

[0020] The power storage system operates as any one of a stand-alone model, a first grid-connected model, a second grid-connected model, and a third grid-connected model.

[0021] (4) The second voltage may be higher than the first voltage.

[0022] The third grid-connected model can operate using a second voltage that is higher than the first voltage handled by the first grid-connected model and the second grid-connected model.

[0023] (5) The energy storage system may further include an operation panel, and the operation panel may include a program execution unit for executing a program that inputs commands to the control unit, and the model selection unit may be realized by a program executed by the program execution unit when the energy storage system starts operating.

[0024] When the test run of the electricity storage system is started, the model selection unit is realized by a program executed by the program execution unit of the operation panel, and a model on which the electricity storage system operates can be selected.

[0025] (6) The energy storage system may further include a remote controller, and the remote controller may include a program execution unit for executing a program that inputs commands to the control unit and a communication unit for communicating between the program execution unit and the control unit, and the model selection unit may be realized by a program executed by the program execution unit when the trial operation of the energy storage system begins.

[0026] When the test run of the power storage system is started, the model selection unit is realized by a program executed by the program execution unit of the remote controller, and a model on which the power storage system operates can be selected.

[0027] (7) The control unit may include a memory unit that stores information identifying the model in response to receiving information identifying the model from the program execution unit, and a model implementation unit that controls the power conversion unit and the switching unit to implement functions according to the identified model so as to operate as the model identified by the information stored in the memory unit.

[0028] Information for specifying the model is stored in the storage unit, and the model program execution unit controls the power conversion unit and the switching unit based on the information, thereby making it possible to operate the power storage system as the selected model.

[0029] (8) The model implementation unit may include a processor connected to the memory unit, a program memory unit connected to the processor for storing a control program having an execution path that changes according to the information so that the power conversion unit and the switching unit operate as a model specified by the information stored in the memory unit, and an execution start unit that causes the processor to start executing the control program in response to an instruction to start operation of the energy storage system.

[0030] The control program stored in the program storage unit and started to be executed by the initial control unit controls the power conversion unit and the switching unit so that the system operates as a model specified by the information stored in the storage unit. By allowing the user to select which model the system will operate as when starting a trial run of the power storage system, the power storage system operates as the selected model during operation.

[0031] (9) The model implementation unit may include a processor, a program memory unit connected to the processor and storing a plurality of control programs for controlling the power conversion unit and the switching unit to operate as a plurality of models, and an execution start unit that, in response to an instruction to start operation of the energy storage system, causes the processor to start executing one of the plurality of control programs corresponding to the information stored in the memory unit.

[0032] The plurality of control programs controls the power storage system as a corresponding model, and the power storage system operates as a set model by executing the control programs according to the information stored in the storage unit.

[0033] (10) The model implementation unit may further include a model selection unit that allows the operator to select one of a plurality of models in response to receiving an instruction from the program execution unit to start trial operation of the energy storage system, and an instruction transmission unit that transmits information identifying the model selected by the operator to the control unit via the model selection unit.

[0034] By transmitting information specifying the model designated by the operator to the control unit, the control unit can control the power storage system so that it operates as the designated model.

[0035] (11) The model implementation unit may further include a connection confirmation unit that, in response to the instruction sending unit sending information identifying the model to the control unit, checks whether the state of the cable connection to the multiple external input / output terminals is consistent with the specifications of the model specified by the operator; a trial run termination unit that, in response to the confirmation by the connection confirmation unit being positive, terminates the trial run; and a trial run interruption unit that, in response to the confirmation by the connection confirmation unit being negative, notifies the operator that the cable connection is not consistent with the model specified by the operator and interrupts the trial run.

[0036] If the cable connections to multiple external input / output terminals do not match the specifications of the specified model, the energy storage system will not function properly. If the cable connections match, the test run can be terminated and the energy storage system will be able to operate. If the cable connections do not match the specifications of the specified model, a message to that effect is displayed and the test run is aborted. The operator can operate the energy storage system properly by changing the cable connections or changing the model designation.

[0037] (12) A method for initializing a power storage system according to a second aspect of this disclosure is a method for initializing a power storage system that can operate with any of a plurality of models, and may include the steps of: having an operator select one of the plurality of models in response to the start of a trial run of the power storage system; determining whether or not the specifications of the specified model are consistent with the state of cable connections to a plurality of external input / output terminals of the power storage system; initializing the power storage system to operate as the model selected by the operator and terminating the trial run in response to a positive determination in the determining step; and interrupting the trial run in response to a negative determination in the determining step by notifying the operator that the cable connections are not consistent with the model specified by the operator.

[0038] If the cable connections to multiple external input / output terminals do not match the specifications of the specified model, the energy storage system will not function properly. If the cable connections match, the test run can be terminated and the energy storage system will be able to operate. If the cable connections do not match the specifications of the specified model, a message to that effect is displayed and the test run is aborted. The operator can operate the energy storage system properly by changing the cable connections or changing the model designation.

[0039] [Details of the embodiments of this disclosure] Specific examples of power storage systems according to embodiments of this disclosure will be described below with reference to the drawings. Note that this disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0040] First embodiment 1. Configuration A. Overall configuration Referring to FIG. 1, a home power facility 50 equipped with a power storage system includes a power storage system 68 according to an embodiment of the present disclosure, a general load distribution panel 60, and a distribution panel 62 for the power storage system.

[0041] The power storage system 68 has a terminal block 72, and is connected to the general load distribution board 60 and the power storage system distribution board 62 via the terminal block 72 and a cable. A remote controller (hereinafter referred to as "remote control") 70 for operation is attached to the power storage system 68. As will be described below, in this embodiment, the power storage system 68 is installed using the remote control 70. Of course, an operation panel may be provided on the housing of the power storage system 68 instead of the remote control 70. As shown in FIG. 1, the remote control 70 may be attached to the housing of the power storage system 68 and used as an operation panel, or may be detached and used as a remote control.

[0042] The general load distribution panel 60 is connected to the grid via an outdoor switch 74. The outdoor switch 74 is dependent on the power company. A power purchase meter 66 and a power sales meter 64 are installed on the power cable beyond the outdoor switch 74.

[0043] B. General distribution board Referring to Figure 2, the general load distribution panel 60 includes a contract breaker 104 that is dependent on the electric power company, a main earth leakage breaker 100 that receives power from the grid power via the contract breaker 104, a general outlet breaker 102 that receives power from the main earth leakage breaker 100, and a changeover switch breaker 103 that, like the general outlet breaker 102, receives power from the main earth leakage breaker 100 and has an output that is connected to one terminal of a changeover switch in the distribution panel 62 for the storage system.

[0044] The general load distribution board 60 has, as main terminals, a grounding terminal 106, a PV (Photovoltaic) grid-connection terminal 108, a power storage system grid-connection terminal 110, a power storage system distribution board terminal 112, and a plurality of general outlet terminals 114.

[0045] The main earth leakage breaker 100 includes first, second, and third breakers. The first breaker is connected to a PV grid-connection terminal 108. The second breaker is connected to a storage system grid-connection terminal 110. The third breaker is connected to a general outlet breaker 102 and a changeover switch breaker 103.

[0046] C. Distribution board for energy storage system 3, the power storage system distribution board 62 includes a changeover switch 150 having input terminals 152 and 154, a power storage system breaker 156 having one end connected to the changeover switch 150, and a specific load breaker 158 that receives a 100V power supply from the power storage system breaker 156. The input terminal 152 is connected to the power storage system distribution board terminal 112 shown in Fig. 2. The input terminal 154 is connected to the power storage system 68 output terminal during a power outage of the power storage system 68 of the terminal block 72 of the power storage system 68 shown in Fig. 1.

[0047] D. Energy storage system Referring to FIG. 4, the power storage system 68 includes a storage battery 200, a PCS unit 202 having one end connected to the storage battery 200 and the other end connected to the terminal block 72, a communication unit 208 for communicating between the remote control 70 and the PCS unit 202, and a relay unit 210.

[0048] The terminal block 72 is provided with external input / output terminals such as a ground terminal 226, a system terminal 220, a PV self-sustaining terminal, and a power outage output terminal 224.

[0049] The relay unit 210 includes relays RY1 to RY5 for controlling the mutual connections between the system terminal 220, the PV self-sustaining terminal, and the power outage output terminal 224 and the terminals of the PCS unit 202 that are not on the storage battery 200 side.

[0050] Relay RY1 is provided between the system terminal 220 and the PCS unit 202. Relay RY2 is provided between the PV self-sustaining terminal and the PCS unit 202. Relay RY3 is provided between the power failure output terminal 224 and the PCS unit 202. Relay RY4 is provided between the ground potential and the power failure output terminal 224. Relay RY5 is provided between the system terminal 220 and the power failure output terminal 224.

[0051] Voltage sensors 230, 232, and 234 for measuring the voltage at each terminal are provided at the grid terminal 220, the PV self-sustaining terminal, and the power outage output terminal 224, respectively. The outputs of the voltage sensors 230, 232, and 234 are all provided to the PCS unit 202. In the following drawings, the reference numerals for the voltage sensors 230, 232, and 234 are not shown to simplify the drawings. The same applies to the other reference numerals.

[0052] Furthermore, the power storage system 68 is provided with an input terminal 204 that receives the output of a current sensor (not shown in FIG. 4) for detecting reverse power flow when connected to the grid, and an input terminal 206 that detects the output current of the PV when the PV is connected. The outputs of these current sensors are provided to the PCS unit 202 via the input terminals 204 and 206.

[0053] Referring to FIG. 5, the PCS unit 202 has a terminal 256 connected to the storage battery 200, a terminal 258 to which one ends of relays RY1, RY2, and RY3 are connected, and terminals 260 and 262 to which the input terminals 204 and 206 shown in FIG. 4 are respectively connected.

[0054] PCS unit 202 has one end connected to terminal 256 and the other end connected to terminal 258, and includes a power conversion unit 240 for converting AC power input from grid power or the like into DC power, and for converting DC power output from storage battery 200 into 100V AC power. PCS unit 202 further includes a control unit 242 for controlling power conversion unit 240 in response to outputs from a current sensor received from terminals 260 and 262, commands received from remote control 70, and the like.

[0055] In this embodiment, the control unit 242 includes a microcontroller unit (MCU) 252, a program for the MCU 252 to control the power conversion unit 240, and a non-volatile memory 254 for storing the selected model name and the like. The MCU 252 wirelessly communicates with the remote control 70 shown in FIG. 1 and the like. Note that the memory 254 is actually provided inside the MCU 252.

[0056] E. Wiring In the power storage system 68 according to this embodiment, the power storage system 68 operates as one selected from different models through operations performed during installation. For each model, the connections between the power storage system 68 and the general load distribution board 60, the power storage system distribution board 62, and the PCS of the photovoltaic power generation device, if any, change. Furthermore, depending on the selected model, the open / close state of each relay in the power storage system 68 is switched, and the wiring of the power storage system 68 changes. Below, the wiring of the power storage system 68 for each model will be described. Note that the wiring described below is basically the same as the wiring for each dedicated model.

[0057] E1. Standalone model 6, when operating as a standalone model, the grounding terminal 106 of the general load distribution panel 60 is connected to the grounding terminal 226 via a grounding cable. Nothing is connected to the grid terminal 220. The power storage system grid-connection terminal 110 of the general load distribution panel 60 is connected to the PV self-sustaining terminal 222. Relay RY1 is off, relay RY2 is on, relay RY3 is also on, relay RY4 is off, and relay RY5 is also off. The power failure output terminal 224 is connected to the input terminal 154 of the changeover switch 150 of the power storage system distribution panel 62.

[0058] In this standalone model, in order to prevent reverse power flow from the storage battery 200 to the grid power, it is necessary to install a current sensor 300 in the wiring from the general load distribution board 60 to the grid power, and input its output to the PCS unit 202 via the input terminal 206.

[0059] The standalone model has two operating modes: a grid-connected mode and an independent mode. The grid-connected mode is a mode in which the storage battery 200 is charged with power from the grid. The independent mode is a mode in which the storage battery 200 is discharged mainly during a power outage.

[0060] In the grid-connected mode, as shown in Fig. 6, relay RY1 is off, relay RY2 is on, relay RY3 is also on, relay RY4 is off, and relay RY5 is also off. Power from the grid is used to charge the storage battery 200 via relay RY2 and the PCS unit 202. Power from the grid is also supplied to the power storage system distribution board 62 from the PV self-sustaining terminal 222 via relays RY2 and RY3.

[0061] In the independent mode, relay RY1 is off, relay RY2 is on, relay RY3 is also on, relay RY4 is off, and relay RY5 is off. As a result, power discharged from storage battery 200 is supplied to general load distribution board 60 via PCS unit 202 and relay RY2. Power discharged from storage battery 200 is also supplied to power storage system distribution board 62 via relay RY3.

[0062] E2. Standalone model without solar power generation in grid-connected model 7, when the power storage system 68 operates as this model, the grounding terminal 106 of the general load distribution panel 60 is connected to the grounding terminal 226 via a grounding cable. Nothing is connected to the grid terminal 220. The power storage system grid-connection terminal 110 of the general load distribution panel 60 is connected to the PV self-sustaining terminal 222. The input terminal 154 of the power storage system distribution panel 62 is connected to the power outage output terminal 224. This wiring is the same as in the stand-alone model.

[0063] This model also requires a current sensor 300.

[0064] This model also has two operating modes: grid-connected mode and stand-alone mode.

[0065] In the grid-connected mode, as shown in Fig. 7, relay RY1 is off, relay RY2 is on, relay RY3 is also on, relay RY4 is off, and relay RY5 is also off. Power from the grid is used to charge the storage battery 200 via relay RY2 and the PCS unit 202. Power from the grid is also supplied to the power storage system distribution board 62 from the PV self-sustaining terminal 222 via relays RY2 and RY3.

[0066] In the independent mode, relay RY1 is off, relay RY2 is on, relay RY3 is on, relay RY4 is on, and relay RY5 is off. What differs from the standalone model is that relay RY4 is turned on. As a result, the power discharged from the storage battery 200 is supplied to the general load distribution panel 60 via the PCS unit 202 and relay RY2. The power discharged from the storage battery 200 is also supplied to the power storage system distribution panel 62 via relay RY3. Relay RY4 is turned on because it is required by regulations in the independent mode when connected to the grid.

[0067] E3. 100V grid-connected model with solar power generation in the grid-connected model In the grid-connected model, when a photovoltaic power generation system including a photovoltaic power generation panel 330 and a PCS 332 is connected to a power storage system 68 and receives 100V power supply from the grid, the power storage system 68 is wired as follows. That is, referring to FIG. 8 , the grounding terminal 106 of the general load distribution board 60 is connected to the grounding terminal 226 via a grounding cable. The power storage system interconnection terminal 110 of the general load distribution board 60 is connected to the grid terminal 220 via a grid cable, and U-phase or W-phase power is supplied. The PV self-sustaining cable 338 from the PCS 332 of the photovoltaic power generation system is connected to the PV self-sustaining terminal 222, and 100V AC power is supplied. The input terminal 154 of the changeover switch 150 of the power storage system distribution board 62 is connected to the power failure output terminal 224. The PV grid-connection terminal 108 of the power storage system distribution board 62 is connected to the PV grid-connection cable 336 from the photovoltaic power generation system PCS 332. Therefore, in this model, in addition to the current sensor 300, a current sensor 334 consisting of a CT sensor is required to detect the current flowing from the PCS 332 to the general load distribution board 60 through the PV interconnection cable 336 and provide the output to the PCS section 202 via the input terminal 204.

[0068] In the grid-connected mode of this model, relay RY1 is on, relay RY2 is off, relay RY3 is also off, relay RY4 is also off, and relay RY5 is on. As a result, 100V power from the grid is used to charge the storage battery 200 via relay RY1 and PCS unit 202. 100V power from the grid is also supplied to the power storage system distribution board 62 from the grid terminal 220 via relay RY5 and power outage output terminal 224. Power generated by the photovoltaic power generation panel 330 is supplied from the PCS 332 to the general load distribution board 60 via a PV grid-connected cable 336.

[0069] In the independent mode, relay RY1 is off, relay RY2 is on, relay RY3 is also on, relay RY4 is also on, and relay RY5 is off. As a result, power from the solar power generation panel 330 is provided to the power storage system distribution board 62 via relay RY2 and relay RY3. If necessary, power from the solar power generation panel 330 is also used to charge the storage battery 200 via relay RY2 and the PCS unit 202. When the discharged power of the storage battery 200 is used, that power is provided to the general load distribution board 60 via the PCS unit 202 and relay RY2, and is also provided to the power storage system distribution board 62 via relay RY3.

[0070] E4. 200V grid-connected model with solar power generation in the grid-connected model In the grid-connected model, the wiring of power storage system 68 when receiving 200V power supply from the grid power is as follows. That is, referring to Fig. 9, grounding terminal 106 of general load distribution panel 60 is connected to grounding terminal 226 by a grounding cable. Power storage system interconnection terminal 110 of general load distribution panel 60 is connected to grid terminal 220 by a grid cable, and U phase, O phase, and V phase are supplied from the grid power. In other respects, the wiring in this model is the same as that shown in Fig. 8.

[0071] In the grid-connected mode of this model, as shown in Fig. 9, relay RY1 is on, relay RY2 is off, relay RY3 is also off, relay RY4 is also off, and relay RY5 is on. As a result, 200V power from the grid is used to charge the storage battery 200 via relay RY1 and PCS unit 202. 200V power from the grid is also supplied to the power storage system distribution board 62 from the grid terminal 220 via relay RY5 and power failure output terminal 224. Power generated by the photovoltaic power generation panel 330 is supplied from the PCS 332 to the general load distribution board 60 via a PV grid-connected cable 336.

[0072] In the independent mode, relay RY1 is off, relay RY2 is on, relay RY3 is on, relay RY4 is on, and relay RY5 is off. As a result, power from the solar power generation panel 330 is provided to the power storage system distribution board 62 via relay RY2 and relay RY3. The power from the solar power generation panel 330 is also used to charge the storage battery 200 via relay RY2 and the PCS unit 202, if necessary. When the discharged power of the storage battery 200 is used, the power is provided to the general load distribution board 60 via the PCS unit 202, relay RY1, and the grid terminal 220, and is also provided to the power storage system distribution board 62 via relay RY3 and the power failure output terminal 224.

[0073] E5.Terminal Block and Model Wiring Specifications Fig. 10 shows a plan view of the terminal block 72 in this embodiment. Referring to Fig. 10, the terminal block 72 is provided with, from the left side of Fig. 10, a grounding terminal 226, a grid terminal 220, a PV self-sustaining terminal 222, and a power outage output terminal 224. As will be described later, after setting a model in which the power storage system 68 operates, during trial operation, cables that match the specifications of the set model must be connected to each terminal.

[0074] FIG. 11 shows in table form the connection specifications for each terminal when the power storage system 68 of the terminal block 72 is used as each model.

[0075] When using the power storage system 68 as a grid-connected model 200V, an AC (Alternating Current) 200V system cable from the system is connected to the system terminal 220. A PV self-sustaining cable 338 from the PCS 332 is connected to the PV self-sustaining terminal 222. A power outage output cable is connected to the power outage output terminal 224.

[0076] When using the power storage system 68 as a grid-connected model without PV, nothing is connected to the grid terminal 220. An AC 100V cable from the grid is connected to the PV self-sustaining terminal 222. An output cable during power outages is connected to the power outage output terminal 224.

[0077] When using the power storage system 68 as a grid-connected model with PV, a 100V system cable from the system is connected to the system terminal 220. A PV system independence cable 338 from the PCS 332 is connected to the PV system independence terminal 222. A power failure output cable is connected to the power failure output terminal 224.

[0078] When the power storage system 68 is used as a stand-alone model, nothing is connected to the grid terminal 220. An AC 100V grid cable from the grid is connected to the PV self-sustaining terminal 222. A grounding cable from the grounding terminal 106 is connected to the grounding terminal 226.

[0079] F. Program Structure F1. Remote control test run program In this embodiment, when the power storage system 68 is installed, a remote control 70 is used to set a model of the power storage system 68. The control structure of a program executed by the remote control 70 for this purpose will be described with reference to FIGS. 12 to 14 . Although not shown, the remote control 70 is provided with a button for starting a test run or a touch switch using a display panel such as a liquid crystal display. These will be referred to as "test run buttons" hereinafter. When the test run button is pressed, the remote control 70 executes a program for the test run, which will be described below. Although not particularly shown or described in FIGS. 12 to 14 , a "test run stop" button is always displayed on the display panel of the remote control 70, and pressing this button stops the test run. The display panel of the remote control 70 is provided with buttons necessary for operating the power storage system 68, such as a button for instructing the start of normal operation.

[0080] 12, when the test run button is pressed, a message 452 saying "Test run will start" is displayed on the display panel. When an OK button (not shown) is pressed, a message 454 is displayed. Note that, for the sake of brevity, the operation of the OK button will not be specifically described below.

[0081] In step 402, it is determined whether the user's selection on display 454 is a grid-tied model. The program further includes step 404, which is executed when the determination in step 402 is affirmative. In step 404, it is determined whether the model selected in step 402 is a 100V grid-tied model.

[0082] This program further includes step 406, which is executed when the determination in step 404 is affirmative, and displays a display 456 to prompt the user to select whether the grid-connected phase to be used in the 100V grid-connected model is UO or OW. The selection in step 406 is stored in memory. The model is selected through the above processing.

[0083] This program further includes step 408, which is executed when the determination in step 404 is positive, and when the determination in step 404 is negative and the processing of step 406 is executed, and which displays display 458 to prompt the user for consent to the start of the grid-connected trial run, and starts the grid-connected trial run if consent is given. The grid-connected trial run referred to here is performed by checking, when a grid-connected model is selected, whether or not a voltage according to the model specifications is detected at the grid terminals 220 of the terminal block 72, based on the output of the voltage sensor (voltage sensor 230 in FIG. 4) provided at each terminal.

[0084] The program further includes step 410 for determining whether the grid connection test run was successful or not, and displaying display 460 if successful, or displaying display 462 if unsuccessful. Display 462 is intended to notify the user that the cable connected to terminal block 72 does not conform to the specifications of the selected model.

[0085] This program further includes step 412, in which, when display 462 is displayed in step 410, the test run is interrupted, display 464 is displayed, and an input is received from the user regarding whether or not to review the wiring and retry the grid-connected test run. After the user reviews the wiring of terminal block 72, for example, the user selects "retry" in step 412. If the user wants to reset the model, the user selects "reset" in step 412. According to this program, when the determination in step 412 is positive, control returns to step 408.

[0086] This program further includes step 414, which displays a message such as "Start reset" when the determination in step 412 is negative, i.e., when the user input is "reset," and branches the control according to the result. If the determination in step 414 is positive, the control proceeds to step 412. If the determination in step 414 is negative, the control returns to step 402.

[0087] 13, this program further includes step 416, which is executed when the determination in step 402 in FIG. 12 is negative and when the determination in step 410 in FIG. 12 is positive, to display display 468, determine whether or not 100V input from the grid is present at PV self-sustaining terminal 222 in accordance with a user input, and branch the flow of control depending on the determination result.

[0088] The program further includes step 418 of executing an auxiliary input test run in response to a positive determination in step 416, and step 420 of determining whether the test run in step 418 was successful, and displaying display 470 if the determination was successful, or displaying display 472 if the determination was successful. Display 472 is for reporting that the cable connected to terminal block 72 does not match the specifications of the selected model. In step 418, it is determined whether the voltage at PV self-sustaining terminal 222 is 100 V based on the output of voltage sensor 232 shown in FIG. 4. If this voltage is 100 V, the test run was successful.

[0089] This program further includes step 422, which is executed when the determination in step 420 is negative, to interrupt the test run and display display 474 to accept user input. If the user selects retry, control returns to step 418. If the user selects reset, control proceeds to step 424, and if an instruction to reset is given, control returns to step 402 in Figure 12. Here, if retry is selected, control returns to step 422.

[0090] 14, this program further includes step 428, which is executed when the determination in step 416 in FIG. 13 is negative, and when the determination in step 416 in FIG. 14 is negative and the determination in step 420 is positive, for executing an independent output test run, and step 430, which determines whether the independent test run was successful as a result of step 428, and displays display 476 or 478 according to the result, thereby branching the control. Display 478 is intended to notify the user that the cable connected to terminal block 72 does not conform to the specifications of the selected model. In step 428, it is determined whether a predetermined voltage is being output to power failure output terminal 224.

[0091] The program further includes step 436, which is executed after the determination in step 430 is affirmative and the user selects OK in response to the display of display 476, and which displays display 482 and ends the test run.

[0092] This program further includes step 432, which is executed after the determination in step 430 is negative and the test run is interrupted, and after the user selects the OK button in response to the display of display 478, and which displays display 480 to accept user input regarding whether to retry the independent power test run. If the determination in step 432 is positive, control proceeds to step 430.

[0093] This program further includes step 434, which accepts a user input regarding whether or not to reset the model when the determination in step 432 is negative, and branches the control flow according to the input. If the determination in step 434 is positive, the control returns to step 402 in Figure 12. If the determination in step 434 is negative, the control returns to step 432.

[0094] F2. Test run program executed by PCS section 202 15 is a flowchart showing the control structure of a program executed by PCS unit 202 during a test run. The program shown in Fig. 15 is executed when power to power storage system 68 is turned on and an instruction to start the test run program is received from remote control 70.

[0095] Referring to FIG. 15, this program includes step 500 of turning off all of relays RY1 to RY5, step 502 of setting the model of the power storage system 68 to standalone, without 100V input, and step 504 of waiting for input from the remote control 70.

[0096] This program further includes step 506, which, when a command is received from the remote controller 70, branches the flow of control in accordance with the command.

[0097] This program includes step 508, in response to the command received in step 506 being model information specifying a model, storing the model name in memory, and step 510, in accordance with the specified model, setting a predetermined value to a model flag that is referenced to change the execution path in accordance with the model in the program executed during operation, and returning control to step 504.

[0098] This program further includes step 512, in response to the command received in step 506 indicating the presence or absence of 100V input, storing the information in memory 254 (see FIG. 5), and step 514, in which a 100V input flag is set in accordance with the presence or absence of 100V input, and the flow of control is returned to step 504. The model for which power storage system 68 is set is determined by combining the value of the model flag set in step 510 and the value of the 100V input flag set in step 514.

[0099] This program further includes step 516 of measuring the voltage at the grid terminal 220 in response to the command received in step 506 being to perform a grid-connected trial run, and step 518 of determining whether the measured voltage is correct for the model set in the power storage system 68. This program further includes step 520 of returning a response (normal response) to the remote control 70 indicating that the trial run has ended normally and returning control to step 504 when the determination in step 518 is positive, and step 520 of returning a response (error response) to the remote control 70 indicating that the trial run has not ended normally and returning control to step 504 when the determination in step 518 is negative.

[0100] This program further includes step 524, in response to the command received in step 506 being an auxiliary input test run, measuring the voltage at the PV self-sustaining terminal 222 and proceeding to control step 518, and step 526, in response to the command received in step 506 being an independent output test run, measuring the voltage at the power outage output terminal 224 and proceeding to control step 518. Note that the specific processing performed in step 518 differs depending on whether the previous step is step 516, step 524, or step 526.

[0101] G.MCU Configuration The remote control 70 and PCS unit 202 shown in Figures 1, 4 to 9, etc., each include an MCU. They basically have the same configuration. Here, the configuration of the MCU included in the remote control 70 is shown.

[0102] 16, this MCU includes an MPU (Micro-Processing Unit) 602 which is a processor, a high-speed bus 600 to which the MPU 602 is connected, an SRAM (Static Random Access Memory) 604 connected to the high-speed bus 600, a flash memory 606 connected to the high-speed bus 600, and a ROM (Read-Only Memory) 608 connected to the high-speed bus 600. The SRAM 604 holds data necessary for executing a program, etc. The flash memory 606 stores a program 626 for implementing functions realized by the remote control 70 (or PCS unit 202). The flash memory 606 corresponds to the memory 254 shown in FIG. 5. The ROM 608 stores a boot-up program for the MPU 602, etc.

[0103] The MCU further includes a low-speed bus 610 connected to the high-speed bus 600 via a bridge 612, a serial I / F (Interface) 614, an ADC (Analog-to-Digital Converter) 616, a timer / counter 618, a clock generator 620, a power supply control unit 622, and a general-purpose I / F 624, all of which are connected to the low-speed bus 610.

[0104] The operation of the MCU is well known, and what is meaningful in the embodiment is the function of the program that it executes, so the operation of the MCU itself will not be described below.

[0105] 2.Operation A. Initial Setup When it becomes necessary to set the system model, such as when initially installing the power storage system 68 or when adding a solar power generation system, the user (installer) first connects cables appropriate for the model to each terminal of the terminal block 72 according to the model to be set. The user then operates the "trial run" button on the remote control 70. This causes the MCU of the remote control 70 to start executing a program having the control structure shown in Figs. 12 to 14. At the same time, the MCU 252 of the PCS unit 202 shown in Fig. 5 starts executing a program whose control structure is shown in Fig. 15, executes the processes of steps 500 and 502, and waits for an instruction from the remote control 70 in step 504.

[0106] A1. Standalone model When the user sets the power storage system 68 to a standalone model, if the wiring is correct, processing is performed through steps 402, 416, 418, 420, 428, and 430 in the program whose control structure is shown in FIGS.

[0107] At this time, on the power storage system 68 side, in response to the instruction output from the remote controller 70 in step 402 in Fig. 12, the processing of steps 504, 506, 508, and 510 in Fig. 15 is performed, the fact that the model is a standalone model is stored in memory, and a corresponding value is set in the model flag. Also, in response to the instruction output from the remote controller 70 in step 416 in Fig. 13, processing is executed along the path of steps 504, 506, 512, and 514 in Fig. 15. Furthermore, in response to the instruction output from the remote controller 70 in step 418, the PCS unit 202 performs processing of steps 504, 506, 524, 518, and 520 in Fig. 15. As a result, the determination in step 420 in Fig. 13 becomes positive, and the test run ends. If the wiring is not properly performed or the set model is incorrect, the determination in step 518 becomes negative, resulting in an error.

[0108] A2. Grid-connected model 100V (without solar power generation) In this case, if the wiring is correct, the test run is completed in the remote controller 70 via steps 402, 404, 406, 408, 410, 416, 418, and 420 in FIGS.

[0109] In the MCU 252 of the PCS unit 202, in response to the instruction indicating that it is a grid-connected model output by the remote control 70 in step 402 of FIG. 12, processing of the path of steps 504, 506, 508, and 510 in FIG. 15 is executed, the fact that it is a grid-connected model 100V (without solar power generation) is stored in memory, and a corresponding value is set in the 100V input flag.

[0110] 12, information indicating the 100V grid-connected model and the grid-connected phase at that time is input from the remote control 70 to the MCU 252. In response to this, the MCU 252 executes the processing of steps 504, 506, 512, and 512 of FIG. 15, and information indicating that a 100V input is present at the PV self-sustaining terminal 222 and the grid-connected phase is stored in memory, and a value indicating the presence of a 100V input is set in the 100V input flag. Note that the fact that the 100V input is present at the PV self-sustaining terminal 222 and not at the grid terminal 220 can be determined from the fact that information indicating that the model set in step 508 is a grid-connected model 100V (without photovoltaic power generation) is stored in memory.

[0111] 12, when an instruction to execute a grid-connected test run is given to the MCU 252 from the remote controller 70, the MCU 252 performs processing through steps 504, 506, 516, 518, and 520 shown in FIG. 15, and returns a normal response if the connection is normal. If the connection is not normal, an error response is returned in step 522.

[0112] 13, an instruction to perform an independent output test run is issued from the remote controller 70 to the MCU 252. In response to this instruction, the MCU 252 executes the process of steps 504, 506, 526, 518, and 520 in FIG. 15, and returns a normal response to the remote controller 70 in step 520. If there is an error in the wiring, an error response is returned to the remote controller 70 in step 522.

[0113] A3.Grid-connected model 100V (with solar power generation) In this case, if the wiring is correctly performed, the test run is completed in the remote controller 70 via steps 402, 404, 406, 408, 410, 416, 418, and 420 in FIGS.

[0114] In the MCU 252 of the PCS unit 202, in response to the instruction indicating that it is a grid-connected model output by the remote control 70 in step 402 of FIG. 12, processing of the path of steps 504, 506, 508, and 510 in FIG. 15 is executed, the fact that it is a grid-connected model 100V (with solar power generation) is stored in memory, and a value corresponding to this is set in the model flag.

[0115] 12, information indicating the 100V grid-connected model and the grid-connected phase at that time is input from the remote control 70 to the MCU 252. In response to this, the MCU 252 executes the processing of steps 504, 506, 512, and 512 of FIG. 15, and information indicating that a 100V input is present at the grid terminal 220 and the grid-connected phase is stored in memory, and a value indicating the presence of a 100V input is set in the 100V input flag. Note that it can be determined that the 100V input is present at the grid terminal 220 and not at the PV self-sustaining terminal 222, since information indicating the grid-connected model 100V (with photovoltaic power generation) is stored in memory in step 508.

[0116] In step 408 in FIG. 12, steps 416 and 418 in FIG. 13, and step 428 in FIG. 14, the processing executed by the MCU 252 in contrast to the processing executed by the remote controller 70 is the same as in the case of the grid-connected model 100V (without photovoltaic power generation).

[0117] A4.Grid-connected model (200V) In this case, if the wiring is correctly performed, the test run is completed in the remote controller 70 via steps 402, 404, 408, 410, 416, 418, and 420 in FIGS.

[0118] In the MCU 252 of the PCS unit 202, in response to the instruction indicating the grid-connected model (200V) output by the remote controller 70 in step 404 of FIG. 12, processing of the path of steps 504, 506, 508, and 510 in FIG. 15 is executed, the fact that the set model is the grid-connected model (200V) is stored in memory, and a value corresponding to this is set in the model flag.

[0119] In step 408 of Fig. 12, steps 416 and 418 of Fig. 13, and step 428 of Fig. 14, the processing executed by the MCU 252 in relation to the processing executed by the remote controller 70 is the same as in the case of the grid-connected model 100V (without solar power generation). However, what differs from the case of the grid-connected model 100V (without solar power generation) is that in step 408, it is determined whether the voltage at the grid terminal 220 is 200V or not.

[0120] B. Operation of the Energy Storage System 68 in Each Model When the power storage system 68 is properly connected, the model flag stores a value indicating the set model. In this embodiment, the MCU 252, which controls the PCS unit 202 of the power storage system 68, checks the model flag and executes a program along an execution path that executes the function of the corresponding model from among the four models described above. This program combines the routines of these individual programs using the model flag to realize the functions of each model as a separate program. Therefore, the power storage system 68 operates according to the specifications of the set model.

[0121] 3. Starting the control program during operation The startup process of the control program during normal operation of the above embodiment will be described with reference to Fig. 17. In this description, particularly relevant parts of the circuit shown in Fig. 16 will be referenced.

[0122] 17, a program 626 for controlling power conversion unit 240 and relay unit 210 to operate power storage system 68 as a specified model is stored at a predetermined address in flash memory 606. This program 626 has a program structure in which the execution path changes depending on the value of a model flag.

[0123] The SRAM 604 stores a model flag 666 referenced by the program 626. When the control unit 242 (FIG. 5) receives a command to start normal operation of the power storage system 68, a type of system program called a program loader 650 runs, reads the program 626 from a predetermined address in the flash memory 606, loads it into the SRAM 604 (FIG. 16), and causes the MPU 602 to start executing it. At the same time as the MPU 602 starts executing the program 626, it also reads the model flag 666 from the SRAM 604. The MPU 602 then executes the program 626 in accordance with the value of the model flag 666. As a result, the control unit 242 (FIG. 5) is realized through cooperation between the MPU 602 and the program 626, and each model of the power storage system 68 is implemented.

[0124] 4.Effects As described above, according to this embodiment, one power storage system 68 can be set to any of the four models and operated. Therefore, a user who has no intention of installing a solar power generation system, a user who may install a solar power generation system in the future but does not intend to install one immediately, a user who intends to install a solar power generation system and connect it to the grid power at 100 V, and a user who intends to install a solar power generation system and connect it to the grid power at 200 V can all purchase and install the same power storage system 68. The model to be operated as can be set at the time of installation. Furthermore, when changing the model, it is only necessary to change the settings of the power storage system 68 without replacing the power storage system 68. Therefore, a power storage system that is easy to install at the current stage can be provided for a user who intends to install a power storage system, taking into consideration future system changes.

[0125] Furthermore, the electricity storage system 68 can be used as any of the four models described above. Therefore, manufacturers only need to manufacture the same product using the same line, and there is no need to manufacture multiple products using the same line, or to set up multiple lines to manufacture multiple products. Therefore, it is possible to provide an electricity storage system that is easy for manufacturers to manufacture and sell.

[0126] Another benefit for sellers of energy storage systems is that they can standardize the products they sell to one type. They no longer need to manage multiple products with different functions separately. As a result, sellers of energy storage systems can provide energy storage systems that are easy to manage and sell.

[0127] Second Variation The above-described embodiment relates to a direct transmission system that can be configured as any of a standalone, a grid-connected model 100V (without solar power generation), a grid-connected model 100V (with solar power generation), and a grid-connected model 200V. However, this disclosure is not limited to the above-described embodiment. The grid-connected model voltages that can be configured are not limited to the above-described 100V and 200V, but may correspond to multiple other voltages according to the specifications of the power that the electric power company with which the user has a contract may provide.

[0128] In the above embodiment, the model of the power storage system 68 is set by operating the remote control 70. However, this disclosure is not limited to such an embodiment. For example, the model may be set by operating an operation panel attached to the main body housing of the power storage system 68. Furthermore, the power storage system 68 may be provided with a function for communicating with a remote device via the Internet or the like, and the model of the power storage system 68 may be set by remote operation from the remote device (for example, a seller, manufacturer, or power company).

[0129] In the above embodiment, the program structure has been described as realizing the function of each model of the power storage system 68 by changing the execution path using the model flag. However, this disclosure is not limited to such an embodiment. A separate program may be prepared for each model, and the function corresponding to the selected model may be realized by reading and executing the program from the address where the program is stored according to the selected model. Such a modification will be described below with reference to FIG. 18.

[0130] 18, in this modification, a stand-alone program 660, a program 662 for a 100V grid-connected model, and a program 664 for a 200V grid-connected model are stored in advance in flash memory 606. Note that there are two types of 100V grid-connected models: one with a photovoltaic power generation system connected and one without, but the same program 662 can be used in both cases.

[0131] In addition to a model flag 666, the SRAM 604 also stores an address table 668 that stores the storage address in the flash memory 606 of the program to be read out according to the model flag. When the program loader 650 receives an instruction to start operation, it first reads the model flag 666 from the SRAM 604. Next, the program loader 650 reads from the address table 668 the address corresponding to the program according to the value of the model flag 666. The program loader 650 reads the program from the address read out from the address table 668 in the flash memory 606, loads it into the SRAM 604, and causes the MPU 602 to start executing the program.

[0132] Therefore, the MPU 602 executes a program for realizing the model specified by the model flag 666. As a result, the control unit 242 (FIG. 5) is realized by cooperation between the MPU 602 and the selected program (one of the programs 660, 662, and 664), and each model of the power storage system 68 is implemented.

[0133] The embodiments disclosed herein should be considered in all respects as merely illustrative and not restrictive. The scope of the disclosure is not defined by the detailed description of the disclosure, but by the claims of the appended claims, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0134] RY1, RY2, RY3, RY4, RY5 relays 50 Power equipment 60 General load distribution board 62 Distribution board for power storage system 64 Power meter 66 Power purchase meter 68 Energy Storage System 70 Remote Control 72 Terminal block 74 Outdoor switch 100 Main earth leakage breaker 102 General outlet breaker 103 Breaker for changeover switch 104 Contract Breaker 106, 226 Ground terminal 108 PV grid connection terminal 110 Storage system interconnection terminal 112 Terminal for distribution board for power storage system 150 Switch 152, 154, 204, 206 input terminals 156 Breaker for storage system 158 Specific load breaker 200 storage batteries 202 PCS Department 208 Communications Department 210 Relay Section 220 system terminal 222 PV stand-alone terminal 224 Power outage output terminal 230, 232, 234 Voltage sensors 240 Power conversion unit 242 Control Unit 252 MCU 254 memory 256, 258, 260, 262 terminals 300, 334 Current Sensor 330 solar panels 332 PCS 336 PV grid connection cable 338 PV self-supporting cable 402, 404, 406, 408, 410, 412, 414, 416, 418, 420, 422, 424, 426, 428, 430, 432, 434, 436, 500, 502, 504, 506, 508, 510, 512, 514, 516, 518, 520, 522, 524, 526 steps 452, 454, 456, 458, 460, 462, 464, 466, 468, 470, 472, 474, 476, 478, 480, 482 display 600 Express Bus 602 MPU 604 SRAM 606 Flash Memory 608 ROM 610 Slow Bus 612 Bridge 614 Serial I / F 616 ADC 618 Timer Counter 620 Clock Generator 622 Power supply control unit 624 General-purpose I / F 626, 660, 662, 664 Programs 650 Program Loader 666 Model Flag 668 Address Table

Claims

1. A storage battery and a power conversion unit having a first power input / output terminal and a second power input / output terminal connected to the storage battery; A terminal block having multiple external input / output terminals to which cables can be connected, a model selection unit that selects an arbitrary model from a plurality of models each conforming to different specifications; a switching unit that switches connections between the plurality of external input / output terminals and the first power input / output terminal; a control unit that controls the power conversion unit and the switching unit so that the power conversion unit operates according to the model set by the model selection unit, the plurality of models include a stand-alone model and a grid-connected model, The stand-alone model is a power storage system having, as operation modes, a mode in which the storage battery is charged by grid power and a mode in which the storage battery is discharged.

2. The grid interconnection model is a first grid-connected model that is connected to the grid power by a first voltage; The power storage system according to claim 1 , further comprising: a second grid-connected model connected to an AC power source having the first voltage different from the grid power, and connected to the grid power at the first voltage.

3. The power storage system according to claim 2 , wherein the grid-connected model further includes a third grid-connected model to which the AC power source is connected and which is connected to the grid power at a second voltage different from the first voltage.

4. The power storage system according to claim 3 , wherein the second voltage is higher than the first voltage.

5. Further including an operation panel, the operation panel includes a program execution unit for executing a program for inputting commands to the control unit, The power storage system according to claim 1 , wherein the model selection unit is implemented by a program executed by the program execution unit when the power storage system starts operating.

6. Further comprising a remote controller; The remote controller a program execution unit for executing a program that inputs commands to the control unit; a communication unit for performing communication between the program execution unit and the control unit, The power storage system according to claim 1 , wherein the model selection unit is implemented by the program executed by the program execution unit when a test run of the power storage system is started.

7. The control unit a storage unit configured to store, in response to receiving information specifying a model from the program execution unit, the information specifying the model; a model implementation unit that controls the power conversion unit and the switching unit to implement a function according to the specified model so that the power conversion unit and the switching unit operate as a model specified by the information stored in the storage unit.

8. The model implementation unit a processor connected to the storage unit; a program storage unit connected to the processor for storing a control program having an execution path that changes according to the information so that the power conversion unit and the switching unit operate as a model specified by the information stored in the storage unit; The power storage system according to claim 7 , further comprising: an execution start unit that causes the processor to start execution of the control program in response to an instruction to start operation of the power storage system.

9. The model implementation unit a processor; a program storage unit connected to the processor and configured to store a plurality of control programs for controlling the power conversion unit and the switching unit to operate as the plurality of models; an execution start unit that, in response to an instruction to start operation of the power storage system, causes the processor to start execution of a control program corresponding to the information stored in the storage unit, out of the plurality of control programs.

10. The model implementation unit further a model selection unit that allows an operator to select one of the plurality of models in response to receiving an instruction to start a test run of the power storage system from the program execution unit; The power storage system according to claim 8 or 9, further comprising: an instruction transmission unit that transmits, to the control unit, information that identifies the model designated by the operator via the model selection unit.

11. The model implementation unit further a connection confirmation unit that, in response to the instruction transmission unit transmitting the information identifying the model to the control unit, confirms whether or not the state of connection of cables to the plurality of external input / output terminals is consistent with the specifications of the model designated by the operator; a test run termination unit that terminates the test run in response to a positive confirmation by the connection confirmation unit; and a test run interruption unit that, in response to a negative confirmation by the connection confirmation unit, notifies the operator that the connection of the cable is not consistent with a model designated by the operator and interrupts the test run.

12. An initial setting method for a power storage system that can operate with any of a plurality of models, comprising: In response to the start of a test run of the power storage system, allowing an operator to select one of the plurality of models; determining whether or not specifications of a designated model are consistent with a state of connection of cables to a plurality of external input / output terminals of the power storage system; in response to a positive determination in the determining step, initializing the power storage system to operate as a model selected by the operator and terminating the test run; and in response to a negative determination in the determining step, notifying that the cable connection is not consistent with the model specified by the operator and interrupting the trial run.

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