Power supply system

Abstract

The invention provides a power supply system capable of rapidly extinguishing arc when series arc discharge or parallel arc discharge occurs in a portion closer to a power storage module than a power conversion device. The present invention is configured so as to have a power storage module, a power conversion device, a bidirectional converter unit, and an arc discharge detection unit, the power storage module having a secondary battery and being connected to the power conversion device via the bidirectional converter unit, and the arc discharge detection unit detecting arc discharge inside the power conversion device or in a portion closer to the power storage module than the power conversion device. When the arc discharge detection unit detects the arc discharge, an arc cutoff operation for cutting off the conduction of power between the power conversion device and the secondary battery is performed.

Description

Technical Field

[0001] The present invention relates to a power supply system including a power storage module and a power conversion device, wherein power can be supplied from the power storage module to a system power supply unit by connecting the system power supply unit to the power conversion device. Background Art

[0002] In recent years, a hybrid power storage system has been developed that includes a DC / DC converter connected to a solar cell, a bidirectional DC / DC converter connected to a storage battery, and a bidirectional AC / DC inverter connected to a commercial power supply system in a housing (eg, Patent Document 1).

[0003] In this hybrid power storage system, during the day, the power generated by the solar cell can be boosted by the DC / DC converter and then stepped down by the bidirectional DC / DC converter to be charged to the battery, and at night, the power stored in the battery can be boosted by the bidirectional DC / DC converter and converted into AC power by the bidirectional AC / DC inverter to be supplied to the commercial power system.

[0004] Therefore, in this hybrid power storage system, the electric power generated by the solar cell can be supplied to the commercial power system regardless of day or night.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-93887

[0006] In addition, the hybrid power generation system of Patent Document 1 has terminals on the outer surface of the shell, and the battery and solar cell are connected to the terminals with cables. However, if the cables are clamped during construction, damaged, or the terminals are left alone in a poor contact state, arc discharge may occur due to years of deterioration. If arc discharge occurs, there is a possibility of causing a fire.

[0007] This arc discharge can be roughly classified into series arc discharge and parallel arc discharge according to where it occurs on the circuit.

[0008] A series arc discharge is an arc discharge generated when a current passes through a conductor in a series circuit, and a parallel arc discharge is an arc discharge generated when a current passes between two conductors connected in parallel in a parallel circuit.

[0009] These arc discharges need to be extinguished quickly when they occur. Summary of the invention

[0010] Therefore, an object of the present invention is to provide a power supply system capable of quickly extinguishing arcs when series arc discharge or parallel arc discharge occurs at a portion closer to a power storage module than a power conversion device.

[0011] One method of the present invention for solving the above-mentioned problems is a power supply system, which includes a power storage module, a power conversion device, a bidirectional converter unit and an arc discharge detection unit. The power storage module has a secondary battery and is connected to the power conversion device via the bidirectional converter unit. The arc discharge detection unit detects arc discharge on a portion of the power storage module side closer to the power conversion device. When the arc discharge detection unit detects the arc discharge, an arc cutting action is performed to cut off the conduction of power between the power conversion device and the secondary battery.

[0012] According to this aspect, when series arc discharge occurs at a portion closer to the power storage module than the power conversion device, the arc can be extinguished quickly.

[0013] A preferred embodiment is that the bidirectional converter unit comprises: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device, the bidirectional converter unit comprises: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switching element and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit and the conversion side connection unit are connected in series, and a first switching element is connected in parallel with the reactor unit and the power storage module, the bidirectional converter unit is capable of performing a step-down action and a step-up action, and the step-down action causes the first switching element to become The power supply system is provided with a series arc detection unit, and the series arc detection unit is capable of detecting series arc discharge at a portion closer to the power storage module than the bidirectional converter unit. When the series arc detection unit detects series arc discharge, the following series arc cutting action (A) and / or (B) is performed.

[0014] (A) The power storage-side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit.

[0015] (B) The first switching element and the second switching element are kept in the off state or are in the off state and maintained.

[0016] A more preferred embodiment is that the power conversion device comprises: a system-side connection terminal capable of being connected to a system power supply unit; and an inverter unit having an inverter-side cut-off unit capable of cutting off the supply of power to the system-side connection terminal; when the voltage of the inverter unit exceeds the voltage of the power storage module, the series arc cut-off action performs at least the above (A) or the above (B); and when the voltage of the inverter unit is lower than the voltage of the power storage module, the series arc cut-off action performs at least the above (A) or the above (B) and the following (C) in combination.

[0017] (C) The inverter-side cutoff unit cuts off the supply of electric power to the system-side connection terminal.

[0018] A preferred embodiment is that the power conversion device has an inverter unit and a system-side connection terminal that can be connected to a system power supply unit, the inverter unit has a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element, and has a full-bridge circuit in which the third switching element and the sixth switching element, the fourth switching element, and the fifth switching element are respectively arranged at diagonals, the inverter unit has a system cutoff unit, and the system cutoff unit cuts off the flow of power between the full-bridge circuit side and the system-side connection terminal side, the bidirectional converter unit has: a storage side connection unit electrically connected to the storage module; and a conversion side connection unit electrically connected to the power conversion device, the bidirectional converter unit has: a step-down circuit in which the storage side connection unit, the reactor unit, the second switching element, and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the storage module; and a step-up circuit in which the storage side connection unit, the reactor unit, the second rectifier unit, and the conversion side connection unit are connected in series, A first switching element is connected in parallel with the reactor unit and the power storage module. The bidirectional converter unit is capable of performing a step-down action and a step-up action. The step-down action causes the first switching element to be in an off state, and the input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and power is output to the power storage module. The step-up action causes the second switching element to be in an off state, and the input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and power is output to the power conversion device. The power supply system has a parallel arc detection unit, and the parallel arc detection unit is capable of detecting parallel arc discharge at a portion closer to the power storage module than the bidirectional converter unit. When the parallel arc detection unit detects parallel arc discharge, the second switching element is kept in an off state or is in an off state and maintained, and at least one of the following parallel arc cutting actions (D) to (F) is performed.

[0019] (D) The power storage-side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit.

[0020] (E) The first switching element is kept in the on state or is turned into the on state and maintained.

[0021] (F) The system disconnection unit disconnects the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and keeps the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element in the on state unchanged or in the on state and maintained.

[0022] In addition, in order to make the power conversion device versatile, the power conversion device and the bidirectional converter unit may be provided independently and connected to each other by a wiring member such as a cable.

[0023] By doing so, the power conversion device can be used in combination with a solar cell power generation system that does not have a power storage function and does not require a bidirectional converter unit.

[0024] However, in this case, cables may be caught during construction, cables may be damaged, or terminals may have poor contact, and there is a possibility that arc discharge may occur there due to aging.

[0025] Therefore, a preferred embodiment is to have a second parallel arc detection unit, the second parallel arc detection unit can detect partial parallel arc discharge between the bidirectional converter unit and the power conversion device, the power conversion device has an inverter unit and a system-side connection terminal that can be connected to a system power supply unit, the inverter unit has a third switching element, a fourth switching element, a fifth switching element and a sixth switching element, and has a full-bridge circuit in which the third switching element and the sixth switching element, the fourth switching element and the fifth switching element are respectively arranged diagonally, the inverter unit has a system cut-off unit, the system cut-off unit cuts off the flow of power between the full-bridge circuit side and the system-side connection terminal side, when the second parallel arc detection unit detects parallel arc discharge, the system cut-off unit cuts off the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and implements at least one of the following second parallel arc cut-off actions (G) and (H).

[0026] (G) Maintain the on state of the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element or change them into the on state and maintain them, and maintain the off state of the first switch element and the second switch element or change them into the off state and maintain them.

[0027] (H) The first switching element and the second switching element are kept in an on state or are turned into an on state and maintained.

[0028] According to this aspect, when parallel arc discharge occurs in a portion between the bidirectional converter unit and the power conversion device, the parallel arc discharge can be quickly extinguished even without providing a circuit breaker.

[0029] In a more preferred embodiment, in the second parallel arc interruption operation, a power storage-side interruption unit provided in the power storage module interrupts the flow of electric power to the bidirectional converter unit.

[0030] A preferred embodiment is that the bidirectional converter unit comprises: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device, the bidirectional converter unit comprises: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switch element and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit and the conversion side connection unit are connected in series, and a first switch element is connected in parallel with the reactor unit and the power storage module, the bidirectional converter unit is capable of performing a step-down action and a step-up action, and the step-down action causes the first switch element to be in an off state, The input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and power is output to the power storage module. The boosting action makes the second switching element become the off state. The input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and power is output to the power conversion device. The power supply system has a second series arc detection unit. The second series arc detection unit can detect partial series arc discharge between the bidirectional converter unit and the power conversion device. When the second series arc detection unit detects series arc discharge, the following second series arc cutting action (I) and / or (J) is implemented.

[0031] (I) The power storage-side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit, and the first switching element and / or the second switching element are kept in an off state or in an off state and maintained.

[0032] (J) The first switching element and the second switching element are kept in an off state or are in an off state and maintained.

[0033] A more preferred embodiment is that the above-mentioned power conversion device comprises: a system-side connection terminal capable of being connected to a system power supply unit; and an inverter unit, comprising an inverter-side cut-off unit capable of cutting off the supply of power to the above-mentioned system-side connection terminal side, and when the voltage of the above-mentioned inverter unit exceeds the voltage of the above-mentioned storage module, the above-mentioned second series arc cut-off action performs at least the above-mentioned (I) or the above-mentioned (J), and when the voltage of the above-mentioned inverter unit is lower than the voltage of the above-mentioned storage module, the above-mentioned second series arc cut-off action performs at least the above-mentioned (I) or the above-mentioned (J) in combination with the following (K).

[0034] (K) The inverter-side cutoff unit cuts off the supply of electric power to the system-side connection terminal.

[0035] A preferred embodiment is a device having a power generation module and a power generation side series arc detection unit, wherein the power conversion device has a boost converter unit, the boost converter unit has a power generation side boost circuit in which a power generation side reactor unit and a power generation side switch element are connected in series, and can implement a power generation side boost action, wherein the power generation side boost action boosts the input voltage from the power generation module by switching the on state and the off state of the power generation side switch element, and outputs power to the bidirectional converter unit, wherein the boost converter unit has a power generation side rectifier unit, wherein the power generation side rectifier unit allows the flow of current from the power generation side boost circuit side to the bidirectional converter unit side, and cuts off the flow of current from the bidirectional converter unit side to the power generation side boost circuit side, wherein the power generation side series arc detection unit can detect a series arc discharge at a portion closer to the power conversion device than the power generation module, and when the power generation side series arc detection unit detects a series arc discharge, a power generation side series arc cutting action is implemented to keep the power generation side switch element in the off state unchanged or in the off state and maintain it.

[0036] A preferred embodiment is a device having a power generation module and a power generation side parallel arc detection unit, wherein the power conversion device has a boost converter unit, wherein the boost converter unit has a power generation side boost circuit having a power generation side reactor unit and a power generation side switch element connected in series, and is capable of performing a power generation side boost action, wherein the power generation side boost action boosts the input voltage from the power generation module by switching the on state and the off state of the power generation side switch element, and outputs power to the bidirectional converter unit, wherein the power generation side parallel arc detection unit is capable of detecting parallel arc discharge of a portion closer to the power conversion device than the power conversion device, and when the power generation side parallel arc detection unit detects parallel arc discharge, a power generation side parallel arc cutting action is performed to keep the power generation side switch element in the on state unchanged or in the on state and maintain it.

[0037] A preferred embodiment is to have a series arc cutoff unit, which is arranged between the power conversion device and the bidirectional converter unit. When the arc discharge detection unit detects the arc discharge, the arc cutoff action causes the series arc cutoff unit to cut off the conduction of power between the power conversion device and the bidirectional converter unit.

[0038] According to this method, when arc discharge is detected between the power conversion device and the bidirectional converter unit, conduction between the power conversion device and the bidirectional converter unit is cut off. Therefore, when series arc discharge occurs between the power conversion device and the bidirectional converter unit, the arc can be extinguished quickly.

[0039] A preferred embodiment is that the device has a positive-side wiring portion, a negative-side wiring portion and a parallel arc short-circuit portion, the bidirectional converter portion is connected to the power conversion device via the positive-side wiring portion and the negative-side wiring portion, and after the series arc cut-off portion cuts off the conduction of power between the power conversion device and the bidirectional converter portion, when the arc discharge detection portion detects the arc discharge, the parallel arc short-circuit portion conducts the positive-side wiring portion and the negative-side wiring portion.

[0040] According to this aspect, even when parallel arc discharge occurs in the portion between the power conversion device and the bidirectional converter unit, the arc can be extinguished quickly.

[0041] A preferred embodiment is that the power conversion device has an inverter unit, the bidirectional converter unit is connected to the inverter unit, the arc discharge detection unit detects arc discharge between the inverter unit and the bidirectional converter unit, the series arc cutoff unit is arranged between the inverter unit and the bidirectional converter unit, and when the arc discharge detection unit detects the arc discharge, the conduction of power between the inverter unit and the bidirectional converter unit is cut off.

[0042] According to this method, when arc discharge is detected in the portion between the inverter portion and the bidirectional converter portion of the power conversion device, the conduction between the inverter portion and the bidirectional converter portion is cut off. Therefore, when a series arc discharge occurs in the portion between the power conversion device and the bidirectional converter portion, the arc can be extinguished quickly.

[0043] A preferred embodiment is that the bidirectional converter has a positive-side wiring portion, a negative-side wiring portion and a parallel arc short-circuit portion, the bidirectional converter portion is connected to the inverter portion via the positive-side wiring portion and the negative-side wiring portion, and after the series arc cut-off portion cuts off the conduction of power between the inverter portion and the bidirectional converter portion, when the arc discharge detection portion detects the arc discharge, the parallel arc short-circuit portion conducts the positive-side wiring portion and the negative-side wiring portion.

[0044] According to this aspect, even when parallel arc discharge occurs in the portion between the inverter unit and the bidirectional converter unit, the arc can be extinguished quickly.

[0045] A preferred embodiment is to have a power generation module, the power generation module is connected to the power storage module via the power conversion device and the bidirectional converter unit, the power conversion device has a boost converter unit, the bidirectional converter unit is electrically connected to the power generation module via the boost converter unit, the arc discharge detection unit detects arc discharge between the boost converter unit and the bidirectional converter unit, the series arc cutoff unit is arranged between the boost converter unit and the bidirectional converter unit, and when the arc discharge detection unit detects the arc discharge, the conduction of power between the boost converter unit and the bidirectional converter unit is cut off.

[0046] According to this method, when arc discharge is detected in the portion between the boost converter portion and the bidirectional converter portion of the power conversion device, conduction between the boost converter portion and the bidirectional converter portion is cut off. Therefore, when a series arc discharge occurs in the portion between the power conversion device and the bidirectional converter portion, the arc can be extinguished quickly.

[0047] A preferred embodiment is to have a positive side wiring portion, a negative side wiring portion and a parallel arc short-circuit portion, the bidirectional converter portion being connected to the boost converter portion via the positive side wiring portion and the negative side wiring portion, and after the series arc cut-off portion cuts off the conduction of power between the boost converter portion and the bidirectional converter portion, when the arc discharge detection portion detects the arc discharge, the parallel arc short-circuit portion conducts the positive side wiring portion and the negative side wiring portion.

[0048] According to this aspect, even when parallel arc discharge occurs in the portion between the boost converter section and the bidirectional converter section, the arc can be extinguished quickly.

[0049] In a preferred embodiment, the series arc cutoff unit is provided outside the power conversion device.

[0050] According to this aspect, it is possible to cope with series arc discharge without modifying the interior of the power conversion device.

[0051] In a preferred embodiment, the parallel arc short-circuit unit is provided outside the power conversion device.

[0052] According to this aspect, it is possible to cope with parallel arc discharge without modifying the interior of the power conversion device.

[0053] One embodiment of the present invention is a power supply system, comprising a power storage module, a power conversion device and a bidirectional converter unit, wherein the power storage module is connected to the power conversion device via the bidirectional converter unit, wherein the power conversion device has an inverter unit and a system-side connection terminal that can be connected to a system power supply unit, the inverter unit has a third switching element, a fourth switching element, a fifth switching element and a sixth switching element, and comprises a full-bridge circuit in which the third switching element and the sixth switching element, the fourth switching element and the fifth switching element are respectively arranged at diagonals, the inverter unit has a system disconnection unit, and the system disconnection unit disconnects the flow of power between the full-bridge circuit side and the system-side connection terminal side, the bidirectional converter unit has: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device, the bidirectional converter unit has: a step-down circuit in which the power storage side connection unit, a reactor unit, a second switching element and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit in which The storage side connection unit, the reactor unit, the second rectifier unit and the conversion side connection unit are connected in parallel with the reactor unit and the storage module. The bidirectional converter unit can perform a step-down operation and a step-up operation. The step-down operation causes the first switch element to be in an off state. By switching the on state and the off state of the second switch element, the input voltage from the power conversion device is stepped down and power is output to the storage module. The step-up operation causes the second switch element to be in an off state. By switching the on state and the off state of the second switch element, the input voltage from the power conversion device is stepped down and power is output to the storage module. The input voltage from the above-mentioned power storage module is boosted by the on state and the off state of a switching element, and power is output to the above-mentioned power conversion device. The above-mentioned power supply system has a parallel arc detection unit, and the above-mentioned parallel arc detection unit can detect parallel arc discharge at a part closer to the above-mentioned power storage module than the above-mentioned bidirectional converter unit. When the above-mentioned parallel arc detection unit detects parallel arc discharge, the above-mentioned second switching element is kept in the off state or is changed to the off state and maintained, and at least one of the following parallel arc cutting actions (D) to (F) is implemented.

[0054] (D) The power storage-side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit.

[0055] (E) The first switching element is kept in the on state or is turned into the on state and maintained.

[0056] (F) The system disconnection unit disconnects the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and keeps the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element in the on state unchanged or in the on state and maintained.

[0057] According to this aspect, when parallel arc discharge occurs in a portion closer to the power storage module than the bidirectional converter unit, the parallel arc discharge can be quickly extinguished without providing a circuit breaker.

[0058] In addition, depending on the arc discharge detection method, it may be possible to determine whether the arc discharge is a series arc discharge or a parallel arc discharge.

[0059] Therefore, one embodiment of the present invention is a power supply system, comprising a power storage module, a power conversion device, a bidirectional converter unit, a positive pole side wiring unit, a negative pole side wiring unit, a parallel arc discharge detection unit and a parallel arc short-circuit unit, wherein the power storage module is connected to the power conversion device via the bidirectional converter unit, the power conversion device has an inverter unit, the bidirectional converter unit is connected to the inverter unit via the positive pole side wiring unit and the negative pole side wiring unit, the parallel arc discharge detection unit detects parallel arc discharge between the inverter unit and the bidirectional converter unit, and when the parallel arc discharge detection unit detects the parallel arc discharge, the parallel arc short-circuit unit causes the positive pole side wiring unit and the negative pole side wiring unit to be conductive.

[0060] According to this method, when parallel arc discharge is detected in the portion between the inverter unit and the bidirectional converter unit of the power conversion device, the positive side wiring unit and the negative side wiring unit connecting the inverter unit and the bidirectional converter unit are made conductive, so that the parallel arc discharge can be extinguished quickly.

[0061] One embodiment of the present invention is a power supply system, comprising a power generation module, a power storage module, a power conversion device, a bidirectional converter unit, a positive pole side wiring unit, a negative pole side wiring unit, a parallel arc discharge detection unit and a parallel arc short-circuit unit, wherein the power generation module is connected to the power storage module via the power conversion device and the bidirectional converter unit, the power conversion device comprises a boost converter unit, the bidirectional converter unit is connected to the boost converter unit via the positive pole side wiring unit and the negative pole side wiring unit, the parallel arc discharge detection unit detects parallel arc discharge between the boost converter unit and the bidirectional converter unit, and when the parallel arc discharge detection unit detects the parallel arc discharge, the parallel arc short-circuit unit causes the positive pole side wiring unit to be conductive with the negative pole side wiring unit.

[0062] According to this method, when a parallel arc discharge is detected in the portion between the boost converter section and the bidirectional converter section of the power conversion device, the positive side wiring section and the negative side wiring section connecting the boost converter section and the bidirectional converter section are made conductive, so that the parallel arc discharge can be quickly extinguished.

[0063] According to the power supply system of the present invention, when a series arc discharge or a parallel arc discharge occurs at a portion closer to the power storage module than the power conversion device, the arc can be extinguished quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a block diagram of the power supply system according to the first embodiment of the present invention.

[0065] Figure 2 yes Figure 1 FIG. 1 is an explanatory diagram of a power generation and power supply pattern of a power supply system, in which the flow of power is shown with a bold line.

[0066] Figure 3 yes Figure 1 FIG. 1 is an explanatory diagram of a power generation and charging mode of a power supply system of FIG. 1 , in which the flow of power is shown with a bold line.

[0067] Figure 4 yes Figure 1 FIG. 1 is an explanatory diagram of a power storage power supply mode of a power supply system of FIG. 1 , in which the flow of power is shown with a bold line.

[0068] Figure 5 yes Figure 1 FIG. 1 is an explanatory diagram of a system power charging mode of a power supply system of FIG. 1 , in which the flow of power is shown by a bold line.

[0069] Figure 6 yes Figure 1 Circuit diagram of the power supply system.

[0070] Figure 7 yes Figure 1 Flow chart of the operation of the power supply system.

[0071] Figure 8 yes Figure 7 Flow chart of the first series arc cutting action of the power supply system.

[0072] Fig. 9 yes Figure 7 Flow chart of the first parallel arc cutting action of the power supply system.

[0073] Fig.10 yes Figure 7 Flow chart of the second series arc cutting action of the power supply system.

[0074] Fig.11 yes Figure 7 Flow chart of the second parallel arc cutting action of the power supply system.

[0075] Fig.12 It is the successor Fig.11 Flow chart after the second parallel arc cutting action.

[0076] Fig.13 yes Figure 7 Flow chart of the third series arc cutting action of the power supply system.

[0077] Fig.14 yes Figure 7 Flow chart of the third parallel arc cutting action of the power supply system.

[0078] Fig.15 It is a block diagram of a power supply system according to a second embodiment of the present invention.

[0079] Fig.16 yes Fig.15 FIG. 1 is an explanatory diagram of a power generation and power supply pattern of a power supply system, in which the flow of power is shown with a bold line.

[0080] Fig.17 yes Fig.15 FIG. 1 is an explanatory diagram of a power generation and charging mode of a power supply system of FIG. 1 , in which the flow of power is shown with a bold line.

[0081] Fig.18 yes Fig.15 FIG. 1 is an explanatory diagram of a power storage power supply mode of a power supply system of FIG. 1 , in which the flow of power is shown with a bold line.

[0082] Fig.19 yes Fig.15 FIG. 1 is an explanatory diagram of a system power charging mode of a power supply system of FIG. 1 , in which the flow of power is shown by a bold line.

[0083] Fig. 20 yes Fig.15 Circuit diagram of the power supply system.

[0084] Fig.21 yes Fig.15 Flowchart of arc cutting action of power supply system.

[0085] Fig. 22 This is a block diagram of a power supply system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0086] Hereinafter, embodiments of the present invention will be described in detail.

[0087] like Figure 1As shown, the power supply system 1 of the first embodiment of the present invention includes power generation modules 2a, 2b, a power conversion device 3, a bidirectional converter unit 5, a storage module 6, a first arc detection unit 7a, 7b (a power generation side series arc detection unit, a power generation side parallel arc detection unit), a second arc detection unit 8 (an arc discharge detection unit, a second parallel arc detection unit, a second series arc detection unit), a third arc detection unit 9 (an arc discharge detection unit, a parallel arc detection unit, a series arc detection unit), a positive side wiring unit 47, a negative side wiring unit 48 and a control unit 10, and can connect the system power supply unit 100 to the power conversion device 3.

[0088] The power supply system 1 supplies the power generated by the power generation modules 2 a and 2 b and the power stored in the power storage module 6 to the system power supply unit 100 connected to the power conversion device 3 .

[0089] The power supply system 1 can implement a generated power supply mode, a generated power charging mode, a stored power supply mode, and a system power charging mode.

[0090] (Power generation mode)

[0091] like Figure 2 As shown, the power generation supply mode is a mode in which the DC power generated by the power generation module 2a (2b) is supplied to the power conversion device 3, the input voltage from the power generation module 2a (2b) is boosted by the boost converter unit 11a (11b) of the power conversion device 3, the boosted power is converted from DC power to AC power by the inverter unit 12, and the AC power is supplied to the system power supply unit 100.

[0092] (Generation power charging mode)

[0093] like Figure 3 As shown, the power generation charging mode is a mode in which the DC power generated by the power generation module 2a (2b) is supplied to the power conversion device 3, the input voltage from the power generation module 2a (2b) is boosted by the boost converter unit 11a (11b) of the power conversion device 3, the boosted power is supplied to the bidirectional converter unit 5, the input voltage from the boost converter unit 11a (11b) is stepped down by the bidirectional converter unit 5 and the stepped down power is charged in the power storage module 6.

[0094] like Figure 4 As shown, the storage power supply mode is a mode in which the power stored by the storage module 6 is supplied to the bidirectional converter unit 5, the input voltage from the storage module 6 is boosted by the bidirectional converter unit 5 and the boosted power is supplied to the power conversion device 3, and the DC power is converted into AC power by the power conversion device 3 and supplied to the system power supply unit 100.

[0095] like Figure 5 As shown, the system power charging mode is a mode in which power is supplied from the system power supply unit 100 to the power conversion device 3, the AC power is converted into DC power by the inverter unit 12 of the power conversion device 3, the converted DC power is supplied from the inverter unit 12 to the bidirectional converter unit 5, and the input voltage from the inverter unit 12 is stepped down by the bidirectional converter unit 5 to charge the storage module 6.

[0096] (Power generation module 2)

[0097] The power generation modules 2 ( 2 a , 2 b ) generate power using renewable energy such as a solar cell module or a fuel cell module.

[0098] The power generation modules 2 a and 2 b of the present embodiment both use solar cell modules that convert light energy into electric energy.

[0099] The power generation modules 2a and 2b are configured by connecting a plurality of solar cell groups in series or in series and in parallel, and each solar cell group includes a plurality of solar cell cells connected in series.

[0100] (Power conversion device 3)

[0101] like Figure 1 As shown, the power conversion device 3 includes a boost converter unit 11 (11a, 11b), an inverter unit 12, positive input terminals 20a, 20b, negative input terminals 21a, 21b, system connection terminals 22, 23, and converter connection terminals 25, 26.

[0102] (Boost Converter Unit 11)

[0103] like Figure 6 As shown, the boost converter unit 11 (11a, 11b) is connected to the power generation modules 2a, 2b via the positive side input terminals 20a, 20b and the negative side input terminals 21a, 21b, respectively, and is connected to the bidirectional converter unit 5 via the converter side connection terminals 25, 26.

[0104] The boost converter section 11a (11b) is a non-insulated DC-DC converter, such as Figure 6 As shown, a reactor unit L1a (L1b) (a reactor unit on the power generation side), a switching element Q1a (Q1b) (a switching element on the power generation side), diode units D1a and D2a (D1b and D2b), and a capacitor unit C1a (C1b) are provided.

[0105] The boost converter unit 11a (11b) is a so-called chopper-type DC-DC converter, and has a boost circuit (power generation side boost circuit) in which a positive side input terminal 20a (20b), an inductor unit L1a (L1b), a switching element Q1a (Q1b) and a negative side input terminal 21a (21b) are connected in series.

[0106] The boost converter unit 11a (11b) is capable of performing a boost operation (power generation side boost operation) which switches the on state and the off state of the switching element Q1a (Q1b) in the boost circuit according to the PWM control signal received from the control unit 10, thereby boosting the power input from the power generation module 2a (2b) to the positive side input terminal 20a (20b), and supplies the boosted power to the inverter unit 12 and the bidirectional converter unit 5.

[0107] That is, the boost converter section 11a (11b) turns on the switch element Q1a (Q1b), so that the boost circuit and the power generation module 2a (2b) together form a closed loop to store energy in the reactor section L1a (L1b), and turns off the switch element Q1a (Q1b), so that the boost circuit forms an open loop to release the energy stored in the reactor section L1a (L1b).

[0108] The boost converter unit 11 a ( 11 b ) can control the duty ratio according to the PWM control signal from the control unit 10 , thereby controlling the on state and the off state of the switching element Q1 a ( Q1 b ) to boost the voltage to a desired voltage.

[0109] In addition, the boost converter unit 11a (11b) has a positive input terminal 20a, a reactor unit L1a (L1b), a diode unit D2a (D2b), a capacitor unit C1a (C1b), and a negative input terminal 21a (21b) connected in series.

[0110] The switching element Q1a (Q1b) and the diode unit D1a (D1b) are connected in parallel with the diode unit D2a (D2b) and the capacitor unit C1a (C1b), respectively, and are connected in parallel with the power generation module 2a (2b) and the reactor unit L1a (L1b), respectively.

[0111] The switching element Q1a (Q1b) can be switched between an on state and an off state according to a PWM control signal generated by the control unit 10, and a transistor such as a bipolar transistor, a field effect transistor, an IGBT (insulated gate bipolar transistor), a relay switch, etc. can be used.

[0112] The diode parts D1a and D2a (D1b and D2b) are rectifying parts that rectify the current in one direction.

[0113] The diode portion D1a (D1b) is provided corresponding to the switching element Q1a (Q1b), allows the flow of current in the opposite direction to the flow of current in the on-state of the switching element Q1a (Q1b), and can block the flow of current in the same direction.

[0114] That is, the diode part D1a (D1b) allows the flow of current from the negative side input terminal 21a (21b) side to the positive side input terminal 20a (20b) side, and can cut off the flow of current from the positive side input terminal 20a (20b) side to the negative side input terminal 21a (21b) side.

[0115] The diode unit D2a (D2b) (rectifier unit on the power generation side) allows the flow of current from the boost circuit side to the inverter unit 12 side and the bidirectional converter unit 5 side, and can cut off the flow of current from the inverter unit 12 and the bidirectional converter unit 5 side to the boost circuit side.

[0116] (Inverter Unit 12)

[0117] The inverter unit 12 is a part that alternately converts DC power and AC power. It can convert DC power supplied from the power generation modules 2a and 2b and DC power supplied from the power storage module 6 into AC power, and can convert AC power supplied from the system power supply unit 100 into DC power.

[0118] like Figure 6 As shown, the inverter unit 12 includes switching elements Q3 to Q6 , diode units D3 to D6 , a reactor unit L2 , and system relay units 27 a and 27 b (inverter-side disconnecting unit, system disconnecting unit).

[0119] The inverter unit 12 can be connected to the system power supply unit 100 via the system-side connection terminals 22 , 23 , and can be connected to the bidirectional converter unit 5 via the converter-side connection terminals 25 , 26 .

[0120] The switching elements Q3, Q6 (the third switching element, the sixth switching element, and the inverter side cut-off unit) and the switching elements Q4, Q5 (the fourth switching element, the fifth switching element, and the inverter side cut-off unit) of the inverter unit 12 are respectively arranged at diagonals, and the inverter unit 12 includes a first arm in which the switching element Q3 and the switching element Q5 are connected in series, and a second arm in which the switching element Q4 and the switching element Q6 are connected in series.

[0121] The inverter unit 12 includes a full-bridge circuit in which a first arm and a second arm are connected in parallel and AC power is input and output from a midpoint of the first arm and a midpoint of the second arm.

[0122] The inverter unit 12 can perform a power conversion operation of converting between DC power and AC power according to the on-off cycle of each switching element Q3 to Q6 based on a PWM control signal from the control unit 10 .

[0123] The inverter unit 12 is provided with system relay units 27 a and 27 b between the midpoint of the first arm and the system-side connection terminal 22 and between the midpoint of the second arm and the system-side connection terminal 23 , respectively.

[0124] When the inverter unit 12 is connected to the system power supply unit 100, the switching element Q3, the inductor unit L2, the system relay unit 27a, the system power supply unit 100, the system relay unit 27b and the switching element Q6 are connected in series, and the switching element Q4, the system relay unit 27b, the system power supply unit 100, the system relay unit 27a, the inductor unit L2 and the switching element Q5 are connected in series.

[0125] The inverter unit 12 constitutes an inverter-side cutoff unit that cuts off the electric power input from the boost converter units 11 a , 11 b and the bidirectional converter unit 5 to the system power supply unit 100 side using the switching elements Q3 to Q6 .

[0126] That is, the inverter unit 12 can cut off the flow of power from the step-up converter units 11a and 11b and the bidirectional converter unit 5 to the system-side connection terminals 22 and 23 by turning off the switching elements Q3 and Q4 or the switching elements Q5 and Q6.

[0127] The switching elements Q3 to Q6 can be switched between an on state and an off state according to a PWM control signal from the control unit 10 , and transistors such as bipolar transistors, field effect transistors, IGBTs (insulated gate bipolar transistors), relay switches, etc. can be used.

[0128] Diode units D3 to D6 are provided in parallel corresponding to switching elements Q3 to Q6 , and can respectively allow the flow of current in the opposite direction to the flow of current in the on-state of switching elements Q3 to Q6 and block the flow of current in the same direction.

[0129] The system relay units 27a and 27b (inverter-side disconnection unit and system disconnection unit) are relays that automatically open and close a switch, and are parts that open and close the flow of power between the full-bridge circuit side and the system-side connection terminals 22 and 23 by turning them on and off.

[0130] The positive electrode side input terminals 20a and 20b are terminals connected to the positive electrode sides of the power generation modules 2a and 2b via wiring members such as cables.

[0131] The negative electrode side input terminals 21 a and 21 b are terminals connected to the negative electrode sides of the power generation modules 2 a and 2 b via wiring members such as cables.

[0132] The system-side connection terminals 22 and 23 are terminals that can be connected to the system power supply unit 100 via wiring members such as cables.

[0133] The converter-side connection terminals 25 and 26 are terminals connected to the bidirectional converter unit 5 via wiring members such as cables (wiring units 47 and 48 ).

[0134] (Bidirectional converter unit 5)

[0135] The bidirectional converter unit 5 is a step-down converter that steps down the power supplied from the power conversion device 3 and supplies the stepped-down power to the power storage module 6 , or a step-up converter that steps up the power supplied from the power storage module 6 and supplies the stepped-up power to the conversion device 3 .

[0136] like Figure 6 As shown, the bidirectional converter unit 5 includes a reactor unit L3, switching elements Q7, Q8, diode units D7, D8, a capacitor unit C2, storage side connection terminals 30, 31 (storage side connection unit) and conversion side connection terminals 32, 33 (conversion side connection unit).

[0137] The bidirectional converter unit 5 includes a step-down circuit in which the storage-side connection terminal 30 , the reactor unit L3 , the switching element Q8 , and the conversion-side connection terminal 32 are connected in series, and a diode unit D7 is connected in parallel with the storage module 6 and the reactor unit L3 .

[0138] The bidirectional converter unit 5 is capable of performing a step-down operation, which causes the switching element Q7 (first switching element) in the step-down circuit to be in an off state, and switches the switching element Q8 (second switching element) between an on state and an off state, thereby stepping down the power input from the power conversion device 3 side to the conversion side connection terminal 32, and supplying it to the storage module 6 from the storage side connection terminal 30.

[0139] That is, the bidirectional converter unit 5 stores energy in the reactor unit L3 by turning the switching element Q7 off and turning the switching element Q8 on, generates an electromotive force in the reactor unit L3 by turning the switching element Q8 off, and can output current from the storage side connection terminal 30 to the storage module 6 through the diode unit D7.

[0140] The bidirectional converter unit 5 includes a boost circuit in which the storage-side connection terminal 30 , the reactor unit L3 , the switching element Q8 , and the conversion-side connection terminal 32 are connected in series, and the switching element Q7 is connected in parallel with the storage module 6 and the reactor unit L3 .

[0141] In the boost circuit, the storage-side connection terminal 30 , the reactor unit L3 , the diode unit D8 , and the conversion-side connection terminal 32 are connected in series, and the diode unit D8 is connected in parallel to the switching element Q8 .

[0142] The bidirectional converter unit 5 is capable of performing a boosting operation, which causes the switching element Q8 in the boosting circuit to be in an off state and switches the switching element Q7 between an on state and an off state, thereby boosting the power input from the power storage module 6 to the power storage side connection terminal 30 and supplying the boosted power from the conversion side connection terminal 32 to the power conversion device 3.

[0143] That is, the bidirectional converter unit 5 turns the switching element Q8 into an off state and turns the switching element Q7 into an on state, so that the boost circuit and the power storage module 6 together form a closed loop to store energy in the reactor unit L3, and turns the switching element Q7 into an off state, so that the boost circuit forms an open loop to release the energy stored in the reactor unit L3.

[0144] The bidirectional converter unit 5 can increase or decrease the voltage to a desired voltage by controlling the duty ratio according to the PWM control signal from the control unit 10 .

[0145] In the bidirectional converter unit 5 , a conversion-side connection terminal 32 , a switching element Q8 , a switching element Q7 , and a conversion-side connection terminal 33 are connected in series.

[0146] The switching element Q7 , the diode unit D7 , and the capacitor unit C2 are connected in parallel to the power storage module 6 and the reactor unit L3 , respectively.

[0147] The switching elements Q7 and Q8 can be switched between an on state and an off state according to a PWM control signal generated by the control unit 10 , and transistors such as bipolar transistors, field effect transistors, IGBTs (insulated gate bipolar transistors), relay switches, etc. can be used.

[0148] The diode parts D7 and D8 are rectifying parts that rectify the current in one direction.

[0149] The diode parts D7 and D8 are provided corresponding to the switching elements Q7 and Q8, and allow the flow of current in the direction opposite to the flow of current in the on-state of the switching elements Q7 and Q8, and can block the flow of current in the same direction.

[0150] That is, the diode unit D7 (first rectifier unit) allows the flow of current from the conversion side connection terminal 33 side to the conversion side connection terminal 32 side, and can block the flow of current from the conversion side connection terminal 32 side to the conversion side connection terminal 33 side.

[0151] The diode unit D8 (second rectifier unit) allows the flow of current from the power storage side connection terminal 30 side to the conversion side connection terminal 32 side, and can block the flow of current from the conversion side connection terminal 32 side to the power storage side connection terminal 30 side.

[0152] The power storage side connection terminal 30 is a positive electrode side connection terminal connected to the positive electrode side of the secondary battery of the power storage module 6 via a wiring member such as a cable.

[0153] The power storage side connection terminal 31 is a negative electrode side connection terminal connected to the negative electrode side of the secondary battery of the power storage module 6 via a wiring member such as a cable.

[0154] The conversion-side connection terminals 32 and 33 are terminals connected to the converter-side connection terminals 25 and 26 of the power conversion device 3 via wiring members (wiring portions 47 and 48 ) such as cables.

[0155] (Electricity storage module 6)

[0156] The power storage module 6 is a storage battery including one or more secondary batteries, and can be charged with the power generated by the power generation modules 2 a and 2 b or the power supplied from the system power supply unit 100 , and can discharge the charged power to the system power supply unit 100 .

[0157] (First Arc Detection Units 7a, 7b)

[0158] The first arc detection unit 7a (7b) is Figure 1 The shown power conversion device 3 is a series arc detection unit that detects series arc discharge when series arc discharge occurs at the part of the input terminals 20a, 21a (20b, 21b) on the power generation module 2a (2b) side, or a parallel arc detection unit that detects parallel arc discharge when parallel arc discharge occurs at the part of the input terminals 20a, 21a (20b, 21b) of the power conversion device 3 that is closer to the power generation module 2a (2b) side.

[0159] That is, for the first arc detection unit 7a (7b), not only the power generation module 2a (2b) becomes the detection object of series arc discharge and parallel arc discharge, but also the wiring components connecting the power generation module 2a (2b) and the input terminals 20a, 21a (20b, 21b) become the detection objects of series arc discharge and parallel arc discharge.

[0160] (Second Arc Detection Unit 8)

[0161] The second arc detection unit 8 is Figure 1 , Figure 6The shown is a series arc detection unit that detects series arc discharge when series arc discharge occurs in the portion (wiring portions 47, 48) between the converter-side connection terminals 25, 26 of the power conversion device 3 and the conversion-side connection terminals 32, 33 of the bidirectional converter unit 5, or a parallel arc detection unit that detects parallel arc discharge when parallel arc discharge occurs in the portion (wiring portions 47, 48) between the converter-side connection terminals 25, 26 of the power conversion device 3 and the conversion-side connection terminals 32, 33 of the bidirectional converter unit 5.

[0162] (Third Arc Detection Unit 9)

[0163] The third arc detection unit 9 is Figure 1 , Figure 6 The shown bidirectional converter unit is a series arc detection unit that detects series arc discharge when series arc discharge occurs at the part of the storage side connection terminals 30, 31 close to the storage module 6, or a parallel arc detection unit that detects parallel arc discharge when parallel arc discharge occurs at the part of the storage side connection terminals 30, 31 of the bidirectional converter unit 5 close to the storage module 6.

[0164] That is, the third arc detector 9 detects not only the power storage module 6 but also wiring components connecting the power storage module 6 and the power storage side connection terminals 30 and 31 for series arc discharge and parallel arc discharge.

[0165] (Positive electrode wiring portion 47)

[0166] The positive electrode side wiring portion 47 is a connection wiring that connects the converter side connection terminal 25 electrically connected to the positive electrode side of the power generation module 2 and the conversion side connection terminal 32 electrically connected to the positive electrode side of the power storage module 6 .

[0167] (Negative-Electrode-Side Wiring Section 48)

[0168] The negative electrode side wiring portion 48 is a connection wiring that connects the converter side connection terminal 26 electrically connected to the negative electrode side of the power generation module 2 and the conversion side connection terminal 33 electrically connected to the negative electrode side of the power storage module 6 .

[0169] (Control Unit 10)

[0170] The control unit 10 has a computer as a hardware structure, which includes: a central processing unit composed of a control device that controls each device and a computing device that calculates data; a storage device that stores data; an input device that inputs data from the outside; and an output device that outputs data to the outside.

[0171] The control unit 10 is a part having a PWM circuit and capable of generating a PWM control signal. By sending the PWM control signal to each switching element Q1a, Q1b, Q3 to Q8, each switching element Q1a, Q1b, Q3 to Q8 can be changed between an on state and an off state.

[0172] Next, use Figure 7 The operation of the power supply system 1 is described with reference to the flowchart of FIG.

[0173] During normal operation, when the arc detection units 7a, 7b, 8, and 9 detect series arc discharge or parallel arc discharge, the power supply system 1 operates to extinguish the series arc discharge or the parallel arc discharge.

[0174] First, normal operation is started in each mode (step S1-1), and it is determined whether the first arc detection unit 7a (7b) detects series arc discharge (hereinafter referred to as first series arc discharge) (step S1-2).

[0175] When the first arc detection unit 7a (7b) does not detect the first series arc discharge (No in step S1-2), it is determined whether the first arc detection unit 7a (7b) detects a parallel arc discharge (hereinafter referred to as the first parallel arc discharge) (step S1-3).

[0176] When the first arc detection unit 7a (7b) does not detect the first parallel arc discharge (No in step S1-3), it is determined whether the second arc detection unit 8 detects a series arc discharge (hereinafter referred to as a second series arc discharge) (step S1-4).

[0177] When the second arc detection unit 8 does not detect the second series arc discharge (No in step S1-4), it is determined whether the second arc detection unit 8 detects a parallel arc discharge (hereinafter referred to as a second parallel arc discharge) (step S1-5).

[0178] When the second arc detection unit 8 does not detect the second parallel arc discharge (No in step S1-5), it is determined whether the third arc detection unit 9 detects a series arc discharge (hereinafter referred to as a third series arc discharge) (step S1-6).

[0179] When the third arc detection unit 9 has not detected the third series arc discharge (No in step S1-6), it is determined whether the third arc detection unit 9 has detected a parallel arc discharge (hereinafter referred to as a third parallel arc discharge) (step S1-7).

[0180] When the third arc detection unit 9 does not detect the third parallel arc discharge (No in step S1-7), it is determined whether there is an operation end request (step S1-8). If there is an operation end request (Yes in step S1-8), the operation is ended.

[0181] In step S1-2, when the first arc detection unit 7a (7b) detects the first series arc discharge (YES in step S1-2), the first series arc interruption operation is executed (step S1-9), and the process shifts to step S1-2.

[0182] In step S1-3, when the first arc detection unit 7a (7b) detects the first parallel arc discharge (Yes in step S1-3), the first parallel arc blocking operation is executed (step S1-10), and the process shifts to step S1-2.

[0183] In step S1-4, when the second arc detection unit 8 detects the second series arc discharge ("Yes" in step S1-4), the second series arc interruption operation is executed (step S1-11), and the process shifts to step S1-2.

[0184] In step S1-5, when the second arc detection unit 8 detects the second parallel arc discharge ("Yes" in step S1-5), the second parallel arc blocking operation is executed (step S1-12), and the process shifts to step S1-2.

[0185] In step S1-6, when the third arc detection unit 9 detects the third series arc discharge ("Yes" in step S1-6), the third series arc cutting operation is executed (step S1-13), and the process shifts to step S1-2.

[0186] In step S1-7, when the third arc detection unit 9 detects the third parallel arc discharge ("Yes" in step S1-7), the third parallel arc cutting operation is executed (step S1-14), and the process shifts to step S1-2.

[0187] In step S1-8, when there is no operation end request ("No" in step S1-8), the process proceeds to step S1-2.

[0188] Next, follow Figure 8 The first series arc cutting action is described in the flowchart of FIG.

[0189] In the first series arc cutting action, first, the switching element Q1a (Q1b) is set to the disconnected state and maintained in the disconnected state or becomes the disconnected state and maintained (step S2-1), and the voltage Vpv of the power generation module 2a (2b) is compared with the voltage Vc1 of the inverter unit 12 to determine whether the voltage Vpv of the power generation module 2a (2b) exceeds the voltage Vc1 of the inverter unit 12 (step S2-2).

[0190] At this time, the voltage Vpv of the power generation module 2a (2b) is the output voltage of the power generation module 2a (2b), that is, the voltage between the positive electrode side input terminal 20a (20b) and the negative electrode side input terminal 21a (21b).

[0191] The voltage Vc1 of the inverter unit 12 is an input voltage to the full-bridge circuit or an output voltage from the full-bridge circuit. In other words, the voltage Vc1 of the inverter unit 12 is an input / output voltage on the converter-side connection terminals 25 and 26 side.

[0192] In step S2-2, when the voltage Vpv of the power generation module 2a (2b) exceeds the voltage Vc1 of the inverter unit 12 ("Yes" in step S2-2), the current flows from the power generation module 2a (2b) side to the inverter unit 12 side, so the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the disconnected state and maintained in the disconnected state or become the disconnected state and maintained (step S2-3).

[0193] Here, the power storage module 6 may include a power storage relay unit (power storage side cutoff unit) that cuts off the flow of power between the built-in secondary battery and the bidirectional converter unit 5 or may not include the power storage relay unit.

[0194] When the power storage module 6 includes a power storage relay unit (Yes in step S2-4), the power storage relay unit is turned off and the switching element Q7 or the switching element Q8 is set to the off state and maintained in the off state or in the off state (step S2-5).

[0195] On the other hand, when the power storage module 6 does not include a power storage relay unit (No in step S2-4), the switching element Q8 is set to the off state and maintained in the off state or is set to the off state and maintained (step S2-6).

[0196] In step S2-2, when the voltage Vpv of the power generation module 2a (2b) is lower than the voltage Vc1 of the inverter unit 12 (No in step S2-2), the current does not flow from the power generation module 2a (2b) side to the inverter unit 12 side, and thus the process ends directly.

[0197] At this time, in the boost converter unit 11a corresponding to the first arc detection unit 7a that detected the DC arc discharge, the response to the DC arc discharge is completed and the remaining components can be operated. Therefore, the remaining components can perform normal operation in various modes.

[0198] Next, follow Fig. 9 The first parallel arc cutting action is described in the flowchart of FIG.

[0199] In the first parallel arc cutting action, if Fig. 9 As shown, the switching element Q1a (Q1b) of the boost converter unit 11a (11b) corresponding to the first arc detection unit 7a (7b) that detects the first parallel arc discharge is set to the on state and maintained in the on state or is turned on and maintained, and the positive side input terminal 20a (20b) side and the negative side input terminal 21a (21b) side are short-circuited (step S3-1).

[0200] At this time, in the boost converter unit 11a (11b) corresponding to the first arc detection unit 7a (7b) that detected the parallel arc discharge, the response to the parallel arc discharge is completed and the remaining components can be operated. Therefore, normal operation can be performed in various modes among the remaining components.

[0201] Next, follow Fig.10 The second series arc cutting action is described in the flowchart of FIG.

[0202] In the second series arc cutting action, when the power storage module 6 has a power storage relay unit ("Yes" in step S4-1), the power storage relay unit is disconnected (step S4-2), and the switching element Q7 and / or the switching element Q8 are set to the disconnected state and maintained in the disconnected state or are set to the disconnected state and maintained (step S4-3).

[0203] At this time, since the response to the series arc is complete in the power storage module 6 and the bidirectional converter unit 5 , the power generation power supply mode in which the power storage module 6 and the bidirectional converter unit 5 do not contribute can be implemented.

[0204] On the other hand, when the power storage module 6 does not have a power storage relay unit ("No" in step S4-1), the switching elements Q7 and Q8 are set to the disconnected state and maintained in the disconnected state or are set to the disconnected state and maintained (step S4-4), and it is determined whether the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the power storage module 6 (step S4-5).

[0205] At this time, the voltage Vbatt of the power storage module 6 is the input / output voltage of the power storage module 6 , that is, the voltage between the power storage side connection terminal 30 and the power storage side connection terminal 31 .

[0206] In step S4 - 5 , when the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the power storage module 6 (YES in step S4 - 5 ), the current does not flow from the power storage module 6 to the inverter unit 12 , and thus the process ends immediately.

[0207] At this time, since the response to the series arc is complete in the power storage module 6 and the bidirectional converter unit 5 , the power generation power supply mode in which the power storage module 6 and the bidirectional converter unit 5 do not contribute can be implemented.

[0208] On the other hand, when the voltage Vc1 of the inverter unit 12 is lower than the voltage Vbatt of the storage module 6 ("No" in step S4-5), the current flows from the storage module 6 side to the inverter unit 12 side, so the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the disconnected state and maintained in the disconnected state or become the disconnected state and maintained (step S4-6).

[0209] Next, follow Fig.11 and Fig.12 The second parallel arc cutting action is explained in the flowchart of FIG.

[0210] In the second parallel arc cutting operation, the system relay units 27a and 27b are disconnected to disconnect the system power supply unit 100 from the power conversion device 3 (step S5-1). If the power storage module 6 has a power storage relay unit ("Yes" in step S5-2), the power storage relay unit is disconnected (step S5-3).

[0211] Then, when the current from the power generation modules 2a and 2b sides is cut off by the heat dissipation capacity of the switching elements Q1a and Q1b ("Yes" in step S5-4), the switching elements Q1a and Q1b are set to the on state and maintained in the on state or are turned into the on state and maintained (step S5-5), and transfer to step S5-6. When the current from the power generation modules 2a and 2b sides is not cut off by the heat dissipation capacity of the switching elements Q1a and Q1b ("No" in step S5-4), the switching elements Q1a and Q1b are set to the off state and maintained in the off state or are turned into the off state and maintained (step S5-9), and transfer to step S5-6.

[0212] On the other hand, when the power storage module 6 does not have a power storage relay unit (No in step S5-2), the process directly shifts to step S5-4.

[0213] In step S5-6, when only switching elements Q3, Q5 and / or switching elements Q4, Q6 are used ("Yes" in step S5-6), switching elements Q3, Q5 and / or switching elements Q4, Q6 are set to the on state and maintained in the on state or are turned into the on state and maintained (step S5-7), and switching elements Q7, Q8 are set to the off state and maintained in the off state or are turned into the off state and maintained (step S5-8).

[0214] On the other hand, when only switching elements Q3, Q5 and / or switching elements Q4, Q6 are not used ("No" in step S5-6), but only switching elements Q7, Q8 are used ("Yes" in step S5-10), switching elements Q7, Q8 are set to the on state and maintained in the on state or are set to the on state and maintained.

[0215] In addition, when only switching elements Q3, Q5 and / or switching elements Q4, Q6 are not used ("No" in step S5-6) and only switching elements Q7, Q8 are not used ("No" in step S5-10), switching elements Q3, Q5 and / or switching elements Q4, Q6 are set to the on state and maintained in the on state or are turned on and maintained (step S5-12), and switching elements Q7, Q8 are set to the on state and maintained in the on state or are turned on and maintained (step S5-13).

[0216] Next, follow Fig.13 The flowchart of the third series arc cutting action is explained.

[0217] When the power storage module 6 includes a power storage relay unit (Yes in step S6 - 1 ), the third series arc interruption operation turns off the power storage relay unit (step S6 - 2 ).

[0218] At this time, since the response to the series arc is complete in the power storage module 6 , the power generation supply mode in which the power storage module 6 does not contribute can be implemented.

[0219] In addition, when the power storage module 6 does not have a power storage relay unit ("No" in step S6-1), the switching elements Q7 and Q8 are set to the disconnected state and maintained in the disconnected state or are set to the disconnected state and maintained (step S6-3). When the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the power storage module 6 ("Yes" in step S6-4), the current will not flow from the power storage module 6 side to the inverter unit 12 side, and therefore the process ends directly.

[0220] At this time, since the response to the series arc is complete in the power storage module 6 and the bidirectional converter unit 5 , the power generation power supply mode in which the power storage module 6 and the bidirectional converter unit 5 do not contribute can be implemented.

[0221] On the other hand, in step S6-3, when the voltage Vc1 of the inverter unit 12 is lower than the voltage Vbatt of the storage module 6 ("No" in step S6-5), the current flows from the storage module 6 side to the inverter unit 12 side, so the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the disconnected state and maintained in the disconnected state or become the disconnected state and maintained (step S6-6).

[0222] Next, follow Fig.14 The flowchart of the third parallel arc cutting action is explained.

[0223] The third parallel arc cutting action sets the switching element Q8 to the off state and keeps the off state unchanged or turns it into the off state and maintains it (step S7-1). When the power storage module 6 has a power storage relay unit ("Yes" in step S7-2), the power storage relay unit is disconnected (step S7-3).

[0224] On the other hand, when the power storage module 6 does not include a power storage relay unit (No in step S7-2) and only the switching element Q7 is used (Yes in step S7-4), the switching element Q7 is set to the on state and maintained in the on state or is set to the on state and maintained (step S7-3).

[0225] In addition, when the power storage module 6 does not have a power storage relay unit ("No" in step S7-2) and does not use only the switching element Q7 ("No" in step S7-4), and only the switching elements Q3, Q5 and / or the switching elements Q4, Q6 are used ("Yes" in step S7-6), the system relay units 27a, 27b are disconnected (step S7-7), and on the basis of avoiding a short circuit in the system power supply unit 100, the switching elements Q3, Q5 and / or the switching elements Q4, Q6 are set to the on state and maintained in the on state or are turned into the on state and maintained (step S7-8), and the switching element Q7 is set to the off state and maintained in the off state or is turned into the off state and maintained (step S7-9).

[0226] On the other hand, when the power storage module 6 does not have a power storage relay unit ("No" in step S7-2) and does not use only the switching element Q7 ("No" in step S7-4) and does not use only the switching elements Q3, Q5 and / or the switching elements Q4, Q6, that is, when the switching element Q7 and the switching elements Q3, Q5 and / or the switching elements Q4, Q6 are used ("No" in step S7-6), the system relay units 27a, 27b are disconnected (step S7-10), and on the basis of avoiding a short circuit in the system power supply unit 100, the switching elements Q3, Q5 and / or the switching elements Q4, Q6 are set to the on state and maintained in the on state or are turned on and maintained (step S7-11), and then the switching element Q7 is set to the on state and maintained in the on state or is turned on and maintained (step S7-12).

[0227] According to the power supply system 1 of the present embodiment, even when a parallel arc discharge occurs in a portion closer to the storage module 6 than the bidirectional converter unit 5, the switching element Q8 is kept in an off state or is changed to an off state and maintained, and a third parallel arc cutting action of at least one of the following (1) to (3) is performed, so that the parallel arc discharge can be quickly extinguished even without providing a circuit breaker.

[0228] (1) The power storage-side relay unit provided in the power storage module 6 cuts off the power output to the bidirectional converter unit 5 .

[0229] (2) The switching element Q7 is set to the on state.

[0230] (3) The system relay units 27a and 27b are turned off to cut off the conduction of power between the full-bridge circuit side and the system-side connection terminals 22 and 23, and the switching elements Q3 and Q5 and / or the switching elements Q4 and Q6 are set to the on state.

[0231] According to the power supply system 1 of the present embodiment, even when a series arc discharge occurs in a portion closer to the storage module 6 than the bidirectional converter unit 5, the following third series arc cutting action (4) and / or (5) is performed, so that the series arc discharge can be quickly extinguished even without providing a circuit breaker.

[0232] (4) The power storage-side cutoff unit provided in the power storage module 6 cuts off the electric power output to the bidirectional converter unit 5 .

[0233] (5) Set the switching elements Q7 and Q8 to the off state.

[0234] According to the power supply system 1 of the present embodiment, in the third series arc cutting action, when a series arc discharge occurs at a portion closer to the battery module 6 than the bidirectional converter unit 5, when the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the battery module 6, at least the above (4) or the above (5) is performed, and when the voltage Vc1 of the inverter unit 12 is lower than the voltage Vbatt of the battery module 6, a combination of the above (4) or the above (5) and the following (6) is performed. Therefore, even if the voltage Vc1 of the inverter unit 12 is lower than the voltage Vbatt of the battery module 6, the series arc discharge can be extinguished more safely.

[0235] (6) The switching elements Q3 and Q4 and / or the switching elements Q5 and Q6 are set to the OFF state, or the system relay units 27 a and 27 b are turned OFF to cut off the supply of power to the system-side connection terminals 22 and 23 .

[0236] According to the power supply system 1 of the present embodiment, even when a parallel arc discharge occurs in the portion between the bidirectional converter unit 5 and the power conversion device 3, the conduction of power between the full-bridge circuit side and the system side connection terminals 22, 23 is cut off by disconnecting the system relay units 27a, 27b, and at least one of the following (7) and (8) second parallel arc cutting actions is performed, so that the parallel arc discharge can be quickly extinguished even without providing a circuit breaker.

[0237] (7) The switching elements Q3 and Q5 and / or the switching elements Q4 and Q6 are set to the on state, and the switching elements Q7 and Q8 are set to the off state.

[0238] (8) The switching elements Q7 and Q8 are turned on.

[0239] According to the power supply system 1 of the present embodiment, in the second parallel arc blocking operation, when the power storage module 6 includes the power storage side relay unit, the flow of power to the bidirectional converter unit 5 is blocked, so that the arc can be extinguished more safely.

[0240] According to the power supply system 1 of the present embodiment, even when a series arc discharge occurs in the portion between the bidirectional converter unit 5 and the power conversion device 3, the following second series arc cutting action (9) and / or (10) is performed, so that the series arc discharge can be quickly extinguished even without providing a circuit breaker.

[0241] (9) The power storage-side relay unit provided in the power storage module 6 cuts off the power output to the bidirectional converter unit 5 and sets the switching element Q7 and / or the switching element Q8 to the OFF state.

[0242] (10) The switching element Q7 and the switching element Q8 are set to the off state.

[0243] According to the power supply system 1 of the present embodiment, in the second series arc cutting action, when the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the storage module 6, at least the above (9) or the above (10) is performed, and when the voltage Vc1 of the inverter unit 12 is lower than the voltage of the storage module 6, at least the above (9) or the above (10) and the following (11) are combined. Therefore, even when the voltage Vc1 of the inverter unit 12 exceeds the voltage Vbatt of the storage module 6, the series arc discharge can be extinguished more safely.

[0244] (11) The switching elements Q3 and Q4 and / or the switching elements Q5 and Q6 are set to the OFF state, or the system relay units 27 a and 27 b are turned off to cut off the supply of power to the system-side connection terminals 22 and 23 .

[0245] According to the power supply system 1 of the present embodiment, even when a parallel arc discharge occurs in a portion closer to the power generation module 2a (2b) than the power conversion device 3, the first parallel arc cutting off action (power generation side parallel arc cutting off action) is implemented to set the switching element Q1a (Q1b) to the on state, so that the parallel arc discharge can be quickly extinguished even without providing a circuit breaker.

[0246] In the power supply system 1 according to the present embodiment, even when a series arc discharge occurs in a portion closer to the power generation module 2a (2b) than the power conversion device 3, the first series arc cutting-off action (generation side series arc cutting-off action) of setting the switching element Q1a (Q1b) to the disconnected state can be performed, so the arc can be extinguished quickly even without providing a circuit breaker.

[0247] According to the power supply system 1 of the present embodiment, in the first series arc cutting action, when the voltage Vc1 of the inverter unit 12 is lower than the voltage Vpv of the power generation module 2a (2b), the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the disconnected state, and the switching element Q8 is set to the disconnected state, so that the arc can be extinguished more safely.

[0248] According to the power supply system 1 of the present embodiment, when the voltage Vc1 of the inverter unit 12 is lower than the voltage Vpv of the power generation module 2a (2b), and when the power storage module 6 has a power storage side relay unit, the power storage side relay unit is disconnected and the switching element Q7 or the switching element Q8 is set to the disconnected state, so that the arc can be extinguished more safely.

[0249] Next, a power supply system 201 according to a second embodiment of the present invention will be described. Note that the same components as those of the power supply system 1 according to the first embodiment are denoted by the same reference numerals and description thereof will be omitted. The following description is the same.

[0250] like Fig.15 As shown, the power supply system 201 of the second embodiment includes a power generation module 2, a power conversion device 203, a bidirectional converter unit 5, a storage module 6, a positive side wiring unit 47, a negative side wiring unit 48, a short-circuit wiring unit 209, a first relay unit 210 (series arc cutting unit), a second relay unit 211 (parallel arc short-circuit unit) and a control unit 10, which can connect the system power supply unit 100 to the power conversion device 203.

[0251] Moreover, the power supply system 201 of the second embodiment is provided with the first arc detection unit 7a, 7b, the second arc detection unit 8 and the third arc detection unit 9 as needed, thereby being able to perform the same operating action as the power supply system 1 of the first embodiment, but in the following description, these are omitted, and only the second series arc cutting action and the second parallel arc cutting action in the power supply system 1 of the first embodiment implemented by the relay units 210, 211 are described.

[0252] Similar to the power supply system 1 of the first embodiment, the power supply system 201 can implement the generated power supply mode, the generated power charging mode, the stored power supply mode, and the system power charging mode.

[0253] In the power generation mode, Fig.16 As shown, the first relay unit 210 and the second relay unit 211 are both in an open state.

[0254] In the power generation charging mode, Fig.17 As shown, the first relay unit 210 is in a closed state, and the second relay unit 211 is in an open state.

[0255] In the storage power supply mode, if Fig.18 As shown, the first relay unit 210 is in a closed state, and the second relay unit 211 is in an open state.

[0256] In the system power charging mode, if Fig.19 As shown, the first relay unit 210 is in a closed state, and the second relay unit 211 is in an open state.

[0257] (Power conversion device 203)

[0258] like Fig. 20As shown, the power conversion device 203 includes a boost converter unit 11 , an inverter unit 12 , an arc discharge detection unit 217 , a positive input terminal 20 , a negative input terminal 21 , system connection terminals 22 , 23 , and converter connection terminals 25 , 26 .

[0259] (Arc Discharge Detection Unit 217)

[0260] The arc discharge detection unit 217 is provided between the output side of the boost converter unit 11 and the converter-side connection terminal 25 in the generated power supply mode and the generated power charging mode, and detects arc discharge generated in the portion between the boost converter unit 11 and the bidirectional converter unit 5 .

[0261] In addition, the arc discharge detection unit 217 is also arranged between the input side of the inverter unit 12 in the storage power supply mode (the output side of the inverter unit 12 in the system power charging mode) and the converter side connection terminal 25 and detects the arc discharge generated in the part between the inverter unit 12 and the bidirectional converter unit 5.

[0262] That is, the arc discharge detection unit 217 is provided in the middle of a branch wiring that branches from the middle of the wiring connecting the boost converter unit 11 and the inverter unit 12 and is connected to the converter-side connection terminal 25 .

[0263] The arc discharge detection unit 217 of the present embodiment is a high-frequency detection device that can analyze high-frequency noise (high-frequency component) generated when arc discharge occurs and detect arc discharge based on the high-frequency noise.

[0264] (Short-circuit wiring section 209)

[0265] The short-circuit wiring portion 209 is a connection wiring that connects the positive-electrode wiring portion 47 and the negative-electrode wiring portion 48 , and is a portion that electrically connects the positive-electrode wiring portion 47 and the negative-electrode wiring portion 48 .

[0266] (First Relay Unit 210)

[0267] The first relay unit 210 is a relay provided in the middle of the positive-side wiring unit 47 and automatically opens and closes a switch, and is a portion that opens and closes the flow of power between the converter-side connection terminal 25 and the conversion-side connection terminal 32 by turning on and off.

[0268] The first relay unit 210 of the present embodiment is provided on the bidirectional converter unit 5 side with respect to the connection portion between the positive-electrode-side wiring unit 47 and the short-circuiting wiring unit 209 .

[0269] (Second Relay Unit 211)

[0270] The second relay unit 211 is a relay provided in the middle of the short-circuit wiring unit 209 and automatically opens and closes a switch, and is a portion that opens and closes the flow of power between the positive-side wiring unit 47 and the negative-side wiring unit 48 by turning on and off.

[0271] Next, use Fig.21 The flowchart of FIG. 1 illustrates the arc interruption operation of the power supply system 201 .

[0272] The arc cutoff operation of the power supply system 201 is performed in parallel with the above-mentioned various modes, and is an operation of extinguishing the arc discharge when the arc discharge detection unit 217 detects the arc discharge.

[0273] The arc cutting operation of the power supply system 201 is performed without distinguishing between parallel arc discharge and series arc discharge by the arc discharge detection unit 217 , and corresponds to the second series arc cutting operation and the second parallel arc cutting operation in the power supply system 1 of the first embodiment.

[0274] Specifically, if Fig.21 As shown, for the arc cutting action, first, the arc discharge detection unit 217 monitors the arc discharge through high-frequency noise. When arc discharge is detected ("yes" in step S8-1), it is determined whether the time T when the arc discharge is generated (the duration of the arc discharge from the generation of the arc discharge) exceeds the time threshold T1 (step S8-2).

[0275] At this time, the time threshold value T1 is not particularly limited, but is preferably 2 seconds or more and preferably 5 seconds or less.

[0276] The time threshold T1 in this embodiment is set to 2.5 seconds.

[0277] When the time T during which arc discharge occurs exceeds the time threshold T1, that is, when the arc discharge has not been extinguished even after the time threshold T1 has passed since the arc discharge occurred ("Yes" in step S8-2), the first relay unit 210 is opened to cut off the flow of power between the converter side connection terminal 25 and the conversion side connection terminal 32 (step S8-3), and it is determined whether the arc discharge continues to be detected by the arc discharge detection unit 217 (step S8-4).

[0278] When arc discharge continues to be detected by the arc discharge detection unit 217 ("Yes" in step S8-4), it is determined that parallel arc discharge has occurred, and the first relay unit 210 is closed (step S8-5), and the second relay unit 211 is closed to connect the positive side wiring unit 47 and the negative side wiring unit 48 to short-circuit them (step S8-6), and historical processing is performed, that is, the control unit 10 generates historical data such as the time of arc discharge, the number of times the arc discharge occurs, and the type of arc discharge, and sends it to the administrator's computer via a network such as the Internet, and stores the historical data (step S8-7).

[0279] In step S8-4, when the arc discharge detection unit 217 does not continue to detect the arc discharge, it is determined that the arc discharge is a series arc discharge and the arc discharge has been extinguished, and the process proceeds to step S8-7.

[0280] According to the power supply system 201 of the present embodiment, when arc discharge is detected in the portion between the inverter portion 12 and the bidirectional converter portion 5 of the power conversion device 203 and / or in the portion between the boost converter portion 11 and the bidirectional converter portion 5 of the power conversion device 203, the first relay portion 210 cuts off the conduction between the inverter portion 12 and the bidirectional converter portion 5 and the conduction between the boost converter portion 11 and the bidirectional converter portion 5, so that when a series arc discharge occurs in the portion between the power conversion device 203 and the bidirectional converter portion 5, the arc can be extinguished quickly.

[0281] According to the power supply system 201 of the present embodiment, after the first relay unit 210 cuts off the conduction of power between the boost converter unit 11 and the bidirectional converter unit 5 and the conduction between the boost converter unit 11 and the bidirectional converter unit 5, when the arc discharge detection unit 217 continues to detect arc discharge, the second relay unit 211 and the short-circuit wiring unit 209 connect the positive side wiring unit 47 and the negative side wiring unit 48, so that even when parallel arc discharge occurs in the part between the power conversion device 203 and the bidirectional converter unit 5, the arc can be extinguished quickly.

[0282] According to the power supply system 201 of the present embodiment, it is possible to cope with series arc discharge and parallel arc discharge without modifying the interior of the power conversion device 203 .

[0283] In the above embodiment, both power generation modules 2a and 2b are solar cell modules, but the present invention is not limited thereto. Power generation modules 2a and 2b may also be power generation modules of different types. For example, power generation module 2a may be a solar cell module, and power generation module 2b may be a fuel cell module.

[0284] In the above-mentioned embodiment, the power supply system 1, 201 is described as having one or two power generation modules 2, but the present invention is not limited thereto. The power supply system 1, 201 may also have three or more power generation modules 2. In this case, it is preferable to provide a boost converter unit 11 corresponding to each power generation module 2.

[0285] In the above embodiment, the power supply system 1 or 201 is described as including one power storage module 6 , but the present invention is not limited thereto. The power supply system 1 or 201 may include two or more power storage modules 6 . In this case, it is preferable to provide a bidirectional converter unit 5 corresponding to each power storage module 6 .

[0286] In the first embodiment described above, in step S2-3 of the first series arc cutting action, the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the disconnected state in order to cut off the flow of power to the system side connection terminals 22, 23, but the present invention is not limited thereto. Alternatively or additionally, the system relay units 27a, 27b may be disconnected to cut off the flow of power.

[0287] Similarly, in step S4-6 of the second series arc interruption operation, the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the OFF state, but the system relay units 27a, 27b may be turned OFF instead of or in addition thereto.

[0288] Similarly, in step S6-5 of the third series arc interruption operation, the switching elements Q3, Q4 and / or the switching elements Q5, Q6 are set to the off state, but the system relay units 27a, 27b may be turned off instead or in addition.

[0289] In the above embodiment, the inverter unit 12 converts between DC power and AC power using a full-bridge circuit, but the present invention is not limited thereto. The inverter unit 12 may convert between DC power and AC power using a half-bridge circuit.

[0290] In the above embodiment, one control unit 10 performs PWM control on each switching element Q1a, Q1b, Q3 to Q8, but the present invention is not limited thereto. A plurality of control units 10 may perform PWM control on each switching element Q1a, Q1b, Q3 to Q8 individually or in groups.

[0291] In the first embodiment described above, the series arc detection unit for detecting series arc discharge and the parallel arc detection unit for detecting parallel arc discharge of each arc detection unit 7a, 7b, 8, 9 are integrated, but the present invention is not limited to this. The series arc detection unit for detecting series arc discharge and the parallel arc detection unit for detecting parallel arc discharge of each arc detection unit 7a, 7b, 8, 9 may be separate. That is, each arc detection unit 7a, 7b, 8, 9 may also be composed of a plurality of arc detection units.

[0292] In the above-mentioned embodiment, the boost converter unit 11 and the inverter unit 12 of the power conversion device 3, 203 are provided in the same housing, but the present invention is not limited thereto. The boost converter unit 11 and the inverter unit 12 may be independently provided in different housings.

[0293] In the above-mentioned embodiment, the power conversion device 3 and the bidirectional converter unit 5 are separate bodies, but the present invention is not limited thereto. The power conversion device 3 may be integrated with the bidirectional converter unit 5. That is, the boost converter units 11a, 11b, the inverter unit 12, and the bidirectional converter unit 5 may be provided in the same housing.

[0294] In the second embodiment described above, the arc discharge detection unit 217 is disposed inside the power conversion device 203, but the present invention is not limited thereto. The arc discharge detection unit 217 may also be disposed outside the power conversion device 203. For example, Fig. 22 As shown, the arc discharge detection unit 217 may be provided in the positive electrode side wiring unit 47 .

[0295] In the second embodiment described above, the arc discharge detection unit 217 detects arc discharge without distinguishing between series arc discharge and parallel arc discharge, and distinguishes between series arc discharge and parallel arc discharge based on whether arc discharge is detected when the first relay unit 210 is closed, but the present invention is not limited to this. The arc discharge detection unit 217 (parallel arc discharge detection unit) may directly distinguish between series arc discharge and parallel arc discharge.

[0296] In this case, it is possible to determine whether the arc discharge is a series arc discharge or a parallel arc discharge, and therefore, it is also possible to control the relay units 210 and 211 according to the type of arc discharge. That is, when the arc discharge is a series arc discharge, the first relay unit 210 can be closed, and when the arc discharge is a parallel arc discharge, the second relay unit 211 can be closed.

[0297] Regarding the above-mentioned embodiments, each component can be freely replaced or added between the embodiments as long as it is included in the technical scope of the present invention.

[0298] Description of Reference Numerals

[0299] 1, 201…power supply system; 2…power generation module; 3, 203…power conversion device; 5…bidirectional converter unit; 6…power storage module; 7…first arc detection unit (series arc detection unit on power generation side, parallel arc detection unit on power generation side); 8…second arc detection unit (arc discharge detection unit, second parallel arc detection unit, second series arc detection unit); 9…third arc detection unit (arc discharge detection unit, parallel arc detection unit, series arc detection unit); 12…inverter unit; 22, 23…system side connection terminal; 25, 26…converter side connection terminal; 27a, 27b…system relay unit (inverter side cut-off unit, system cut-off unit); 30, 31…power storage side connection terminal (power storage side connection unit); 32, 33…conversion side connection terminal (conversion side connection unit); 100…system power supply unit; 210…first relay Electrical part (series arc cut-off part); 211…second relay part (parallel arc short-circuit part); 217…arc discharge detection part (parallel arc discharge detection part); D2a (D2b)…diode part (generator side rectifier part); D7…diode part (first rectifier part); D8…diode part (second rectifier part); L1a (L1b)…reactor part (generator side reactor part); L3…reactor part; Q1…switching element (generator side switching element); Q3…switching element (third switching element, inverter side cut-off part); Q4…switching element (fourth switching element, inverter side cut-off part); Q5…switching element (fifth switching element, inverter side cut-off part); Q6…switching element (sixth switching element, inverter side cut-off part); Q7…switching element (first switching element); Q8…switching element (second switching element).

Claims

1. A power supply system, characterized in that: It has a power storage module, a power conversion device, a bidirectional converter unit and an arc discharge detection unit. The power storage module includes a secondary battery and is connected to the power conversion device via the bidirectional converter unit. The arc discharge detection unit detects arc discharge at a portion of the power conversion device closer to the power storage module. When the arc discharge detection unit detects the arc discharge, an arc cutoff operation is performed to cut off conduction of electric power between the power conversion device and the secondary battery.

2. The power supply system according to claim 1, characterized in that: The bidirectional converter unit includes: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device. The bidirectional converter unit includes: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switching element, and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit, and the conversion side connection unit are connected in series, and the first switching element is connected in parallel with the reactor unit and the power storage module. The bidirectional converter unit is capable of performing a step-down operation and a step-up operation. The step-down operation causes the first switching element to be in an OFF state, and the input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and the power is output to the power storage module. The step-up operation causes the second switching element to be in an OFF state, and the input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and the power is output to the power conversion device. The power supply system includes a series arc detection unit capable of detecting a series arc discharge at a portion closer to the power storage module than the bidirectional converter unit. When the series arc detection unit detects a series arc discharge, the following series arc cutting action (A) and / or (B) is performed. (A) the power storage side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit, (B) The first switching element and the second switching element are kept in an off state or are in an off state and maintained.

3. The power supply system according to claim 2, characterized in that: The power conversion device includes: a system-side connection terminal that can be connected to a system power supply unit; and an inverter unit that includes an inverter-side cutoff unit that can cut off the supply of power to the system-side connection terminal side. When the voltage of the inverter unit exceeds the voltage of the power storage module, the series arc cutting action performs at least (A) or (B); when the voltage of the inverter unit is lower than the voltage of the power storage module, the series arc cutting action performs at least a combination of (A) or (B) and the following (C). (C) The inverter-side cutoff unit cuts off the supply of electric power to the system-side connection terminal.

4. The power supply system according to any one of claims 1 to 3, characterized in that: The power conversion device includes an inverter unit and a system-side connection terminal that can be connected to a system power supply unit. The inverter unit includes a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element, and is provided with a full-bridge circuit in which the third switching element and the sixth switching element, and the fourth switching element and the fifth switching element are respectively arranged at diagonals. The inverter unit includes a system cutoff unit that cuts off the flow of power between the full-bridge circuit side and the system-side connection terminal side. The bidirectional converter unit includes: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device. The bidirectional converter unit includes: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switching element, and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit, and the conversion side connection unit are connected in series, and the first switching element is connected in parallel with the reactor unit and the power storage module. The bidirectional converter unit is capable of performing a step-down operation and a step-up operation. The step-down operation causes the first switching element to be in an OFF state, and the input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and the power is output to the power storage module. The step-up operation causes the second switching element to be in an OFF state, and the input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and the power is output to the power conversion device. The power supply system includes a parallel arc detection unit capable of detecting parallel arc discharge at a portion closer to the power storage module than the bidirectional converter unit. When the parallel arc detection unit detects a parallel arc discharge, the second switching element is kept in an off state or in an off state and maintained, and at least one of the following parallel arc cutting actions (D) to (F) is performed, (D) the power input to and output from the bidirectional converter unit is cut off by a power storage side cutoff unit provided in the power storage module, (E) keeping the first switching element in the on state or turning it into the on state and maintaining it, (F) The system cutoff unit cuts off the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and keeps the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element in the on state unchanged or in the on state and maintained.

5. The power supply system according to any one of claims 2 to 4, characterized in that: have: A second parallel arc detection unit is capable of detecting a parallel arc discharge in a portion between the bidirectional converter unit and the power conversion device. The power conversion device includes an inverter unit and a system-side connection terminal that can be connected to a system power supply unit. The inverter unit includes a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element, and is provided with a full-bridge circuit in which the third switching element and the sixth switching element, and the fourth switching element and the fifth switching element are respectively arranged at diagonals. The inverter unit includes a system cutoff unit that cuts off the flow of power between the full-bridge circuit side and the system-side connection terminal side. When the second parallel arc detection unit detects a parallel arc discharge, the system cutoff unit cuts off the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and performs at least one of the following second parallel arc cutoff operations (G) and (H). (G) maintaining the on state of the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element unchanged or in an on state and maintaining the on state, and maintaining the off state of the first switch element and the second switch element unchanged or in an off state and maintaining the off state, (H) The first switching element and the second switching element are kept in an on state or are turned into an on state and maintained.

6. The power supply system according to claim 5, characterized in that: In the second parallel arc interruption operation, the power storage-side interruption unit provided in the power storage module interrupts the flow of electric power to the bidirectional converter unit.

7. The power supply system according to any one of claims 1 to 6, characterized in that: The bidirectional converter unit includes: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device. The bidirectional converter unit includes: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switching element, and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit, and the conversion side connection unit are connected in series, and the first switching element is connected in parallel with the reactor unit and the power storage module. The bidirectional converter unit is capable of performing a step-down operation and a step-up operation. The step-down operation causes the first switching element to be in an OFF state, and the input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and the power is output to the power storage module. The step-up operation causes the second switching element to be in an OFF state, and the input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and the power is output to the power conversion device. The power supply system includes a second series arc detection unit capable of detecting a partial series arc discharge between the bidirectional converter unit and the power conversion device. When the second series arc detection unit detects the series arc discharge, the second series arc cutting action of the following (I) and / or (J) is performed. (I) the power storage side cutoff unit provided in the power storage module cuts off the power input to and output from the bidirectional converter unit, and the first switching element and / or the second switching element are kept in an off state or in an off state and maintained; (J) The first switching element and the second switching element are kept in an off state or are in an off state and maintained.

8. The power supply system according to claim 7, characterized in that: The power conversion device includes: a system-side connection terminal that can be connected to a system power supply unit; and an inverter unit that includes an inverter-side cutoff unit that can cut off the supply of power to the system-side connection terminal side. When the voltage of the inverter unit exceeds the voltage of the power storage module, the second series arc cutting-off operation performs at least (I) or (J), and when the voltage of the inverter unit is lower than the voltage of the power storage module, the second series arc cutting-off operation performs at least a combination of (I) or (J) and the following (K). (K) The inverter-side cutoff unit cuts off the supply of electric power to the system-side connection terminal.

9. The power supply system according to any one of claims 1 to 8, characterized in that: It has a power generation module and a power generation side series arc detection unit, The power conversion device includes a boost converter unit. The boost converter unit includes a power generation side boost circuit in which a power generation side reactor unit and a power generation side switch element are connected in series, and is capable of performing a power generation side boost operation, wherein the power generation side boost operation boosts an input voltage from the power generation module by switching an on state and an off state of the power generation side switch element, and outputs power to the bidirectional converter unit. The boost converter unit includes a power generation side rectifier unit that allows the flow of current from the power generation side boost circuit side to the bidirectional converter unit side and cuts off the flow of current from the bidirectional converter unit side to the power generation side boost circuit side. The power generation side series arc detection unit is capable of detecting series arc discharge at a portion closer to the power generation module than the power conversion device. When the power generation side series arc detection unit detects the series arc discharge, a power generation side series arc cutoff operation is performed to keep the power generation side switching element in the open state or to maintain the open state.

10. The power supply system according to any one of claims 1 to 9, characterized in that: It has a power generation module and a parallel arc detection unit on the power generation side. The power conversion device includes a boost converter unit. The boost converter unit includes a power generation side boost circuit in which a power generation side reactor unit and a power generation side switch element are connected in series, and is capable of performing a power generation side boost operation, wherein the power generation side boost operation boosts an input voltage from the power generation module by switching an on state and an off state of the power generation side switch element, and outputs power to the bidirectional converter unit. The power generation side parallel arc detection unit is capable of detecting parallel arc discharge at a portion closer to the power generation side module than the power conversion device. When the power generation side parallel arc detection unit detects a parallel arc discharge, a power generation side parallel arc interruption operation is performed to keep the power generation side switching element in the on state or to maintain the on state.

11. The power supply system according to claim 1, characterized in that: With a series arc cut-off part, The series arc cutoff unit is provided between the power conversion device and the bidirectional converter unit. The arc cutoff operation causes the series arc cutoff unit to cut off conduction of electric power between the power conversion device and the bidirectional converter unit when the arc discharge detection unit detects the arc discharge.

12. The power supply system according to claim 11, characterized in that: It has a positive electrode wiring part, a negative electrode wiring part and a parallel arc short circuit part. The bidirectional converter unit is connected to the power conversion device via the positive electrode side wiring unit and the negative electrode side wiring unit. After the series arc cutoff unit cuts off conduction of power between the power conversion device and the bidirectional converter unit, when the arc discharge detector detects the arc discharge, the parallel arc short-circuit unit conducts the positive-side wiring unit and the negative-side wiring unit.

13. The power supply system according to claim 11 or 12, characterized in that: The series arc cutoff unit is provided outside the power conversion device.

14. The power supply system according to claim 12, characterized in that: The parallel arc short-circuit unit is provided outside the power conversion device.

15. A power supply system comprising a power storage module, a power conversion device, and a bidirectional converter unit, wherein the power storage module is connected to the power conversion device via the bidirectional converter unit, The power supply system is characterized in that The power conversion device includes an inverter unit and a system-side connection terminal that can be connected to a system power supply unit. The inverter unit includes a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element, and is provided with a full-bridge circuit in which the third switching element and the sixth switching element, and the fourth switching element and the fifth switching element are respectively arranged at diagonals. The inverter unit includes a system cutoff unit that cuts off the flow of power between the full-bridge circuit side and the system-side connection terminal side. The bidirectional converter unit includes: a power storage side connection unit electrically connected to the power storage module; and a conversion side connection unit electrically connected to the power conversion device. The bidirectional converter unit includes: a step-down circuit, in which the power storage side connection unit, the reactor unit, the second switching element, and the conversion side connection unit are connected in series, and a first rectifier unit is connected in parallel with the reactor unit and the power storage module; and a step-up circuit, in which the power storage side connection unit, the reactor unit, the second rectifier unit, and the conversion side connection unit are connected in series, and the first switching element is connected in parallel with the reactor unit and the power storage module. The bidirectional converter unit is capable of performing a step-down operation and a step-up operation. The step-down operation causes the first switching element to be in an OFF state, and the input voltage from the power conversion device is stepped down by switching the on state and the off state of the second switching element, and the power is output to the power storage module. The step-up operation causes the second switching element to be in an OFF state, and the input voltage from the power storage module is stepped up by switching the on state and the off state of the first switching element, and the power is output to the power conversion device. The power supply system includes a parallel arc detection unit capable of detecting parallel arc discharge at a portion closer to the power storage module than the bidirectional converter unit. When the parallel arc detection unit detects a parallel arc discharge, the second switching element is kept in an off state or in an off state and maintained, and at least one of the following parallel arc cutting actions (D) to (F) is performed, (D) the power input to and output from the bidirectional converter unit is cut off by a power storage side cutoff unit provided in the power storage module, (E) keeping the first switching element in the on state or turning it into the on state and maintaining it, (F) The system cutoff unit cuts off the conduction of power between the full-bridge circuit side and the system-side connection terminal side, and keeps the third switch element and the fifth switch element and / or the fourth switch element and the sixth switch element in the on state unchanged or in the on state and maintained.

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