WO2013031934A1 - Réseau électrique interconnecté - Google Patents

Réseau électrique interconnecté Download PDF

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Publication number
WO2013031934A1
WO2013031934A1 PCT/JP2012/072113 JP2012072113W WO2013031934A1 WO 2013031934 A1 WO2013031934 A1 WO 2013031934A1 JP 2012072113 W JP2012072113 W JP 2012072113W WO 2013031934 A1 WO2013031934 A1 WO 2013031934A1
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WIPO (PCT)
Prior art keywords
power
battery
unit
converter
way
Prior art date
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PCT/JP2012/072113
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English (en)
Japanese (ja)
Inventor
山▲崎▼　淳
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三洋電機株式会社
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Publication of WO2013031934A1 publication Critical patent/WO2013031934A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Definitions

  • the present invention relates to a power interconnection system including a power generation unit or an external power input unit and a storage battery in which a plurality of battery units are connected in series.
  • Patent Document 1 discloses a power interconnection system including a solar battery that generates power using solar energy and a storage battery in which a plurality of battery units are connected in series.
  • Patent Document 1 When the power interconnection system disclosed in Patent Document 1 is in a sufficient sunshine state, the storage battery is charged with the generated power of the solar battery and a specific load is driven, and in the insufficient sunshine state, the discharge from the storage battery is performed. A specific load is driven by electric power. As a result, the specific load can be driven as long as the remaining capacity of the storage battery does not fall below a predetermined value, not only when it is in the sufficient sunshine state but also in the insufficient sunshine state.
  • JP 10-31525 A Japanese Patent No. 4686768 JP 2010-68558 A
  • Patent Document 1 has a problem in that the voltage between a plurality of battery units connected in series in the storage battery varies and the effective storage capacity of the storage battery decreases.
  • Patent Document 2 discloses a charge control device that can perform series balancing of storage batteries in order to reduce voltage variation between a plurality of battery units connected in series in the storage battery.
  • the charge control device disclosed in No. 2 can charge only one battery unit (storage cell with the lowest cell voltage) that can be charged by a solar battery, and therefore can efficiently perform series balancing of storage batteries. There wasn't. Further, in the charge control device disclosed in Patent Document 2, the solar cell is used exclusively for the series balancing of the storage battery, and the load (electric motor) is driven by the output only from the solar battery or in the storage battery. In order to reduce the voltage variation between a plurality of battery units connected in series, it was not possible to drive a load (electric motor) with some battery units suspended.
  • Patent Document 3 discloses a charging device that charges a plurality of battery units (storage batteries) connected in series.
  • the charging device disclosed in Patent Document 3 is also disclosed in Patent Document 2.
  • the charge control device only one specific battery unit to be charged by the solar battery (storage battery having the lowest open circuit voltage) is used, so that the series balancing of a plurality of battery units connected in series is performed. It could not be done efficiently.
  • the charging device disclosed in Patent Document 3 is connected to a power system that supplies AC power via a bidirectional inverter, it is connected in series to the bidirectional inverter when charging a specific battery unit. Since the number of battery units to be reduced is reduced, the range of the DC voltage received by the bidirectional inverter from the charging device is widened, making it difficult to cope with the bidirectional inverter.
  • the present invention includes a power generation unit or an external power input unit, and a storage battery in which a plurality of battery units are connected in series, and is capable of efficiently performing series balancing of the storage battery.
  • the purpose is to provide.
  • a power interconnection system has a one-to-one correspondence with a power generation unit or an external power input unit, a storage battery in which a plurality of battery units are connected in series, and a plurality of the battery units.
  • a configuration (second configuration) including a bidirectional power converter provided between a power system and the storage battery may be used.
  • the unidirectional power converter includes a control unit, and the control unit corresponds to both ends of the battery unit in a part of the plurality of battery units.
  • the output voltage of the corresponding one-way power converter is not applied to both ends of the battery units in the remaining of the plurality of battery units.
  • the control unit classifies the battery unit having an SOC lower than a predetermined value into a part of the plurality of battery units, and the SOC is equal to or higher than the predetermined value.
  • the unit may be configured to be classified into the remaining battery units (fourth configuration).
  • the power interconnection system includes a plurality of switches each having a one-to-one correspondence with the plurality of battery units, and the switch includes the corresponding battery unit and the corresponding one-way power conversion.
  • the control unit is turned on in a part of the plurality of battery units, and the corresponding one-way power converter outputs at both ends of the battery unit.
  • a voltage is applied, and in the rest of the plurality of battery units, the corresponding switch is turned off, and the output voltage of the corresponding one-way power converter is not applied to both ends of the battery unit.
  • the input ends of the plurality of one-way power converters are separated from each other, and the one-way power converter is a non-insulated power converter.
  • a certain configuration may be adopted.
  • the input terminals of the plurality of unidirectional power converters are commonly connected, and the unidirectional power converter is an insulated power converter. It may be configured.
  • the power interconnection system includes a power generation unit or an external power input unit, a storage battery in which a plurality of battery units are connected in series, and a plurality of one-way power converters that correspond one-to-one with the plurality of battery units.
  • the one-way power converter is a power converter that converts power received from the power generation unit or the external power input unit, and an output terminal of the one-way power converter corresponds to the corresponding battery unit. It is the structure connected to both ends. According to such a configuration, when performing serial balancing of the storage batteries, it is possible to simultaneously reduce the discharge amount of any number of the battery units, or to charge any number of the battery units simultaneously, Series balancing of the storage batteries can be performed efficiently.
  • FIG. 1 is a diagram illustrating a schematic configuration of a power interconnection system according to a first embodiment of the present invention. It is a figure which shows the example of 1 structure of a battery pack. It is a figure which shows the example of 1 structure of a unidirectional step-down DC / DC converter. It is a figure which shows the state of the power interconnection system which concerns on 1st Embodiment of this invention at the time of 1st discharge control. It is a figure which shows the state of the power interconnection system which concerns on 1st Embodiment of this invention at the time of 2nd discharge control. It is a figure which shows the state of the power interconnection system which concerns on 1st Embodiment of this invention at the time of 3rd discharge control.
  • FIG. 1 shows a schematic configuration of the power interconnection system according to the first embodiment of the present invention.
  • the power interconnection system according to the first embodiment of the present invention includes a bidirectional inverter 1, a storage battery 2 in which eight battery units 3_ # 1 to 3_ # 8 are connected in series, and eight switches 4_ # 1.
  • 4_ # 8 one-way step-down DC / DC converters 5_ # 1 to 5_ # 8, eight solar cells 6_ # 1 to 6_ # 8, a BMU (Battery Management Unit) 7, a control unit 8,
  • Eight power generation amount detection units PGD_ # 1 to PGD_ # 8 are provided.
  • battery units 3_ # 1 to 3_ # 8 may be referred to as battery unit 3 when individual division is not necessary.
  • the switch 4, the one-way step-down DC / DC converter 5, the solar cell 6, and the power generation amount detection unit PGD may be referred to.
  • the number of each of the battery unit 3, the switch 4, the one-way step-down DC / DC converter 5, the solar battery 6, and the power generation amount detection unit PGD is eight. May be the value.
  • the bidirectional inverter 1 is provided between the storage battery 2 and the external power system 100 and the load 200.
  • the power system 100 is a power system that supplies AC power
  • the load 200 is a load having an AC power input terminal.
  • the bidirectional inverter 1 is, for example, a bidirectional inverter having a maximum output of 30 kW, and converts AC power (for example, AC power having an effective voltage of 202 V) supplied from the power system 100 into DC power (for example, DC power of 312 to 416 V).
  • Operation supplied to the storage battery 2 and / or DC power supplied from the storage battery 2 and / or supplied from the solar battery 6 via the one-way step-down DC / DC converter 5 (for example, DC power of 312 to 416 V) Is an inverter capable of both of the operation to convert AC power into AC power (for example, AC power of effective voltage 202V).
  • the bidirectional inverter 1 when AC power is a single-phase AC, a full bridge circuit including four power MOSFETs (Metal Oxide Semiconductor Fields Effect Transistors) or IGBTs (Insulated Gate Bipolar Transistors) and a smoothing capacitor are provided.
  • MOSFETs Metal Oxide Semiconductor Fields Effect Transistors
  • IGBTs Insulated Gate Bipolar Transistors
  • a circuit configuration may be mentioned.
  • the full bridge circuit may be changed to a configuration including six power MOSFETs or IGBTs.
  • the bidirectional inverter having the circuit configuration when AC power is converted to DC power, the power MOSFET or IGBT is all turned off, and the full bridge circuit is a diode bridge circuit composed of each body diode of the power MOSFET or IGBT. The rectified voltage generated by the diode bridge circuit is smoothed by the smoothing capacitor.
  • the bidirectional inverter 1 when the power interconnection system is connected to an external DC power source and a DC load, the bidirectional inverter 1 may be changed to a bidirectional DC / DC converter.
  • the bidirectional DC / DC converter there is a circuit configuration in which two unidirectional DC / DC converters are arranged in parallel so as to be opposite to each other.
  • the storage battery 2 As one configuration example of the storage battery 2, a configuration in which eight battery packs are provided and each battery pack corresponds to the battery unit 3 can be given. Further, as another configuration example of the storage battery 2, there is a configuration in which one battery pack is provided and each battery block in the battery pack corresponds to the battery unit 3. Further, a series connection body of a plurality of battery packs may be used as the battery unit 3, and a series connection body of a plurality of battery blocks may be used as the battery unit 3.
  • the battery pack of the configuration example shown in FIG. 2 includes eight battery blocks 301 in which a plurality of battery cells are connected in parallel. Eight battery blocks 301 are connected in series in the battery pack.
  • the battery block 301 is not limited to the configuration example shown in FIG. 2 and may be a single battery cell. Further, when the storage battery 2 includes eight battery packs and each battery pack has a configuration corresponding to the battery unit 3, the battery block 301 in the battery pack may be only one.
  • the battery pack of the configuration example shown in FIG. 2 includes a state detection unit 302 and a communication unit 303 in addition to the battery block 301.
  • the state detection unit 302 detects the state of each battery block 301 or the state of the battery pack.
  • the state detection unit 302 detects the voltage value of each battery block 301, detects the current value and voltage value between the + and-electrodes of the battery pack, the remaining capacity of the battery pack, and transmits the detected data to the communication unit It outputs to 303.
  • the remaining capacity of the battery pack is obtained from the integrated value of the charge / discharge current flowing in the battery pack, and is a calculation formula or table showing the relationship between the predetermined open voltage of the battery pack (OCV: Open Circuit Voltage) and the remaining capacity. Can be obtained by referring to.
  • the communication unit 303 transmits the detection data acquired from the state detection unit 302 to the BMU 7 (see FIG. 1) as battery data.
  • the output ends of the corresponding one-way step-down DC / DC converters 5 are connected to both ends of each battery unit 3 of the storage battery 2 via the corresponding switches 4. Furthermore, a corresponding solar cell 6 is connected to an input end of each one-way step-down DC / DC converter 5 via a corresponding power generation amount detection unit PGD.
  • the output terminal of the unidirectional step-down DC / DC converter 5_ # k is connected to both ends of the battery unit 3_ # k of the storage battery 2 via the switch 4_ # k, and the unidirectional step-down DC / DC converter 5_ # k Solar cell 6_ # k is connected to the input end via power generation amount detection unit PGD_ # k (k is a natural number of 8 or less).
  • the one-way step-down DC / DC converter 5 for example, a one-way non-insulated step-down DC / DC converter including a switching element Q1, a diode D1, a coil L1, and a capacitor C1 shown in FIG. 3 can be used.
  • the solar cell 6 is individually provided for each one-way step-down DC / DC converter 5, it is not necessary to insulate the input side and the output side of the one-way step-down DC / DC converter 5, Compared to the unidirectional non-isolated step-down DC / DC converter, the unidirectional isolated step-down DC / DC converter is disadvantageous for the demand for cost reduction and miniaturization.
  • a unidirectional insulated step-down DC / DC converter may be used.
  • the BMU 7 communicates with the storage battery 2 to monitor the state of each battery unit 3_ # 1 to 3_ # 8 in the storage battery 2, and the state of each battery unit 3_ # 1 to 3_ # 8 in the storage battery 2 Is transmitted to the control unit 8.
  • the control unit 8 receives the detection result from each power generation amount detection unit PGD to monitor the power generation amount of each solar cell 6, and the power generation amount of each solar cell 6 and each battery unit 3_ # 1-3_ in the storage battery 2 Based on the state of # 8 and the external charge / discharge request, the operation of the bidirectional inverter 1, the ON / OFF of the switch 4, and the operation of the one-way step-down DC / DC converter 5 are controlled.
  • the control content of the control unit 8 will be described. In the following description, it is assumed that there is no power loss in each part or power supply line.
  • ⁇ Third discharge control> When a discharge request is received from the outside and the total power generation amount of each solar cell 6 matches the discharge amount of the discharge request, the control unit 8 executes the third discharge control.
  • the bidirectional inverter 1 performs an operation of converting DC power into AC power, all the switches 4 are turned on, and each one-way step-down DC / DC converter 5 outputs It operates so that the voltage matches the voltage of the corresponding battery unit 3 and the input voltage matches the maximum output operating point voltage of the corresponding solar cell 6.
  • the total power generation amount of each solar cell 6 can cover the amount of discharge required for discharge, and as shown in FIG. 6, power is output only from the solar cell 6 and the storage battery 2 stops outputting.
  • the total power generation amount of each solar cell 6 exceeds the discharge amount of the discharge request, a part of the generated power of the solar cell 6 is used for charging the storage battery 2.
  • the control unit 8 When receiving a discharge request from the outside and performing series balancing of the storage battery 2, the control unit 8 performs the fourth discharge control.
  • the bidirectional inverter 1 performs an operation of converting DC power into AC power
  • the switch 4 corresponding to the battery unit 3 whose SOC is lower than a predetermined value is turned ON
  • the SOC is The switch 4 corresponding to the battery unit 3 that is equal to or greater than the predetermined value is turned off
  • the one-way step-down DC / DC converter 5 that corresponds to the battery unit 3 whose SOC is lower than the predetermined value is the output voltage of the battery unit 3 corresponding to the output voltage.
  • the unidirectional step-down DC / DC converter 5 corresponding to the battery unit 3 that operates so that the input voltage matches the maximum output operating point voltage of the corresponding solar cell 6 and the SOC is equal to or greater than a predetermined value. Stop operation.
  • the discharge amount of the battery unit 3 whose SOC is lower than the predetermined value (in FIG. 7, the battery units 3_ # 1 and 3_ # 8 correspond) is the battery unit whose SOC is equal to or higher than the predetermined value. Therefore, series balancing of the storage batteries 2 can be realized.
  • the SOC is a parameter representing the ratio of the remaining capacity (dischargeable capacity) to the full charge capacity (FCC) as a percentage.
  • the timing for performing series balancing of the storage batteries 2 may be periodically performed, for example, or may be performed when, for example, the SOC variation of the battery unit 3 exceeds a threshold value.
  • control part 8 since the amount of discharge of a plurality of battery units can be decreased simultaneously when performing series balancing of storage battery 2, series balancing of storage battery 2 is performed efficiently. be able to. Further, since the number of battery units 3 connected in series to the bidirectional inverter 1 does not decrease, the range of the DC voltage received by the bidirectional inverter 1 from the storage battery 2 does not become wide. Thereby, the correspondence in the bidirectional inverter 1 becomes easy.
  • the control unit 8 executes the first charging control.
  • the bidirectional inverter 1 performs an operation of converting AC power into DC power, all the switches 4 are turned off, and each one-way step-down DC / DC converter 5 is operated. To stop.
  • the storage battery 2 is charged only by the power output from the power system 100.
  • ⁇ Second charge control> When the charge request is received from the outside, and the sum of the total power generation amount of each solar cell 6 and the charge amount of the charge request does not exceed the allowable charge amount of the storage battery 2, the control unit 8 executes the second charge control. To do. According to the second charging control by the control unit 8, the bidirectional inverter 1 performs an operation of converting AC power into DC power, all the switches 4 are turned on, and each one-way step-down DC / DC converter 5 outputs It operates so that the voltage matches the voltage of the corresponding battery unit 3 and the input voltage matches the maximum output operating point voltage of the corresponding solar cell 6. As a result, as shown in FIG. 9, the storage battery 2 is charged by both the power output from the power system 100 and the power output from the solar battery 6.
  • ⁇ Third charging control> When there is no charge request from the outside and the total power generation amount of each solar cell 6 does not exceed the allowable charge amount of the storage battery 2, the control unit 8 performs the third charge control. According to the third charging control by the control unit 8, the bidirectional inverter 1 stops its operation, all the switches 4 are turned on, and each one-way step-down DC / DC converter 5 has the battery unit 3 to which the output voltage corresponds. So that the input voltage matches the maximum output operating point voltage of the corresponding solar cell 6. As a result, as shown in FIG. 10, the storage battery 2 is charged only by the electric power output from the solar battery 6.
  • the bidirectional inverter 1 when the total power generation amount of each solar cell 6 exceeds the allowable charge amount of the storage battery 2, if output to the load 200 is permitted, for example, the bidirectional inverter 1 operates so as to convert DC power into AC power. Thus, a part of the generated power of the solar cell 6 may be output to the load 200. If the output to the load 200 is not allowed, for example, the solar cell 6 is shifted from the maximum output operating point to each solar cell. The total power generation amount of 6 should be reduced.
  • the control unit 8 executes fourth charge control.
  • the bidirectional inverter 1 performs an operation of converting AC power into DC power
  • the switch 4 corresponding to the battery unit 3 whose SOC is lower than a predetermined value is turned on
  • the SOC is The switch 4 corresponding to the battery unit 3 that is equal to or greater than the predetermined value is turned off
  • the one-way step-down DC / DC converter 5 that corresponds to the battery unit 3 whose SOC is lower than the predetermined value is The unidirectional step-down DC / DC converter 5 corresponding to the battery unit 3 that operates so that the input voltage matches the maximum output operating point voltage of the corresponding solar cell 6 and the SOC is equal to or greater than a predetermined value.
  • the battery unit 3 whose SOC is lower than a predetermined value (in FIG. 11, the battery units 3_ # 1 and 3_ # 8 are applicable) has a SOC that is equal to or higher than the predetermined value. Since the charge amount is larger than 3, the series balancing of the storage batteries 2 can be realized. The series balancing of the storage batteries 2 may be performed periodically, for example, or may be performed when, for example, the SOC variation of the battery unit 3 exceeds a threshold value.
  • FIG. 12 shows a schematic configuration of the power interconnection system according to the second embodiment of the present invention.
  • the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • Various modifications described in the description of the first embodiment can be applied to the present embodiment as appropriate.
  • the power interconnection system removes the one-way step-down DC / DC converters 5_ # 1 to 5_ # 8 from the power interconnection system according to the first embodiment of the present invention, and replaces them with a single piece.
  • Directionally insulated step-down DC / DC converters 9_ # 1 to 9_ # 8 are provided, and further, eight solar cells 6_ # 1 to 6_ # 8 and eight power generation amount detection units PGD_ # 1 to PGD_ # 8 are removed, Instead, one solar cell 6 and one power generation amount detection unit PGD are provided, and each input terminal of the one-way insulated step-down DC / DC converters 9_ # 1 to 9_ # 8 is connected in common to form one power generation amount detection unit.
  • the rated output of one solar cell 6 used in the power interconnection system according to the second embodiment of the present invention is eight solar cells 6_ used in the power interconnection system according to the first embodiment of the present invention. It may be equal to the total rated output of # 1 to 6_ # 8.
  • the one-way insulated step-down DC / DC converters 9_ # 1 to 9_ # 8 may be referred to as the one-way insulated step-down DC / DC converter 9 when individual division is unnecessary.
  • the number of each of the battery unit 3, the switch 4, and the one-way insulation type step-down DC / DC converter 9 is eight. May be the value.
  • a one-way insulated step-down DC / DC converter composed of a diode D3, a diode D4, a coil L2, and a capacitor C3 provided on the low-voltage winding side can be used.
  • FIG. 14 shows a schematic configuration of the power interconnection system according to the third embodiment of the present invention.
  • the same parts as those in FIGS. 1 and 12 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • Various modifications described in the description of the first embodiment and the second embodiment can be appropriately applied to the present embodiment.
  • the power interconnection system according to the third embodiment of the present invention removes the solar cell 6 and the power generation amount detection unit PGD from the power interconnection system according to the second embodiment of the present invention, and instead uses the external DC power input unit 10. And an external power detection unit OPD that detects external power received by the external DC power input unit 10.
  • Examples of the external DC power input unit 10 include an external DC power input terminal that receives external DC power.
  • the number of each of the battery unit 3, the switch 4, and the one-way insulated step-down DC / DC converter 9 is eight, Since it is illustrative, other values may be used.
  • the discharge control and the charge control of the control unit 8 are substantially the same as the first to fourth discharge control and the first to fourth charge control of the control unit 8 in the first embodiment, detailed description thereof is omitted. Unlike the first and second embodiments, since no solar cell is used, the maximum output operating point control of the solar cell is not performed, so the value of the input voltage of the one-way insulated step-down DC / DC converter 9 is external It matches the voltage value of the DC power input by the DC power input unit 10.
  • FIG. 15 shows a schematic configuration of a power interconnection system according to the fourth embodiment of the present invention.
  • the same parts as those in FIG. Various modifications described in the description of the first embodiment can be applied to the present embodiment as appropriate.
  • the power interconnection system according to the fourth embodiment of the present invention has a configuration in which a bidirectional DC / DC converter 11 is added to the power interconnection system according to the first embodiment of the present invention.
  • the bidirectional DC / DC converter 11 is provided between the bidirectional inverter 1 and the storage battery 2.
  • Examples of the configuration of the bidirectional DC / DC converter 11 include a circuit configuration in which two unidirectional DC / DC converters are arranged in parallel so as to be opposite to each other.
  • the number of each of the battery unit 3, the switch 4, the one-way step-down DC / DC converter 5, and the power generation amount detection unit PGD is eight. Since the number is an example, another value may be used.
  • the solar cell is used in the first, second, and fourth embodiments described above, other power generation devices such as a wind power generation device and a fuel cell may be used instead of the solar cell.
  • a power generation device that outputs AC power is used as another power generation device, a one-way AC / DC inverter may be used instead of the one-way DC / DC converter.
  • the external DC power input unit is used.
  • an external AC power input unit is used instead of the external DC power input unit, and a unidirectional AC / DC inverter is used instead of the unidirectional DC / DC converter. May be used.
  • the unidirectional step-down DC / DC converter is used as the unidirectional DC / DC converter.
  • the voltage of the battery unit 3 is the solar cell 6.
  • a unidirectional step-up DC / DC converter may be used instead of the unidirectional step-down DC / DC converter.
  • a switch is provided, but in principle, by turning ON / OFF the operation of the unidirectional DC / DC converter, the unidirectional DC / DC converter for each battery unit is provided. Since application of the output voltage can be turned on / off, a configuration without a switch may be employed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Secondary Cells (AREA)

Abstract

L'objet de la présente invention est de fournir un réseau électrique interconnecté qui est équipé d'une unité de production d'énergie ou d'une unité d'alimentation en énergie extérieure et d'une batterie rechargeable qui est dotée de multiples unités de batterie qui sont montées en série, lequel réseau électrique interconnecté permet d'effectuer de façon efficace un équilibrage en série de la batterie rechargeable. La présente invention a trait à un réseau électrique interconnecté qui est équipé d'une unité de production d'énergie ou d'une unité d'alimentation en énergie extérieure (par exemple, une cellule solaire (6)), d'une batterie rechargeable (2) qui est dotée de multiples unités de batterie (3) qui sont montées en série, et d'une pluralité de convertisseurs de puissance unidirectionnels (par exemple, un convertisseur continu-continu abaisseur unidirectionnel (5)) dont le nombre correspond au nombre d'unités de batterie, lesquels convertisseurs de puissance unidirectionnels convertissent l'énergie reçue à partir de l'unité de production d'énergie ou de l'unité d'alimentation en énergie extérieure, les bornes de sortie des convertisseurs de puissance unidirectionnels étant connectées aux deux bornes de l'unité de batterie correspondante.
PCT/JP2012/072113 2011-08-31 2012-08-31 Réseau électrique interconnecté WO2013031934A1 (fr)

Applications Claiming Priority (2)

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JP2011188790A JP2014212580A (ja) 2011-08-31 2011-08-31 電力連系システム
JP2011-188790 2011-08-31

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WO2013031934A1 true WO2013031934A1 (fr) 2013-03-07

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Cited By (1)

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WO2021246929A1 (fr) * 2020-06-05 2021-12-09 Myfc Ab État de cellule de bloc-batterie d'un système d'équilibrage de charge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5993528B1 (ja) * 2016-03-04 2016-09-14 有限会社エーユー建築工房 充電装置
JP6729196B2 (ja) * 2016-08-31 2020-07-22 日産自動車株式会社 電力変換装置
AU2018275531A1 (en) * 2017-05-31 2019-12-12 General Electric Company Energy storage system with string balance function

Citations (4)

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JPH1032936A (ja) * 1996-07-12 1998-02-03 Tokyo R & D:Kk 電源装置の制御システムおよび制御方法
JP2003023736A (ja) * 2001-07-06 2003-01-24 Japan Storage Battery Co Ltd 組電池の充電装置
JP2005151720A (ja) * 2003-11-17 2005-06-09 Mitsubishi Heavy Ind Ltd セルバランス補正装置、二次電池、セルバランス補正方法及びセルバランス補正プログラム
JP2007166747A (ja) * 2005-12-12 2007-06-28 Ntt Facilities Inc 組電池および組電池の充電方法

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Publication number Priority date Publication date Assignee Title
JPH1032936A (ja) * 1996-07-12 1998-02-03 Tokyo R & D:Kk 電源装置の制御システムおよび制御方法
JP2003023736A (ja) * 2001-07-06 2003-01-24 Japan Storage Battery Co Ltd 組電池の充電装置
JP2005151720A (ja) * 2003-11-17 2005-06-09 Mitsubishi Heavy Ind Ltd セルバランス補正装置、二次電池、セルバランス補正方法及びセルバランス補正プログラム
JP2007166747A (ja) * 2005-12-12 2007-06-28 Ntt Facilities Inc 組電池および組電池の充電方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021246929A1 (fr) * 2020-06-05 2021-12-09 Myfc Ab État de cellule de bloc-batterie d'un système d'équilibrage de charge

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