WO2013145658A1 - Appareil de commande de charge/décharge, système de stockage d'électricité et procédé de commande de charge/décharge - Google Patents

Appareil de commande de charge/décharge, système de stockage d'électricité et procédé de commande de charge/décharge Download PDF

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Publication number
WO2013145658A1
WO2013145658A1 PCT/JP2013/001930 JP2013001930W WO2013145658A1 WO 2013145658 A1 WO2013145658 A1 WO 2013145658A1 JP 2013001930 W JP2013001930 W JP 2013001930W WO 2013145658 A1 WO2013145658 A1 WO 2013145658A1
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Prior art keywords
value
current
charge
target
discharge
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PCT/JP2013/001930
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English (en)
Japanese (ja)
Inventor
員史 西川
雄太 黒崎
飯田　崇
栄一郎 橋本
伊藤　和雄
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パナソニック株式会社
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Publication of WO2013145658A1 publication Critical patent/WO2013145658A1/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
    • 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
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H01M10/465—Accumulators structurally combined with charging apparatus with solar battery as charging system
    • 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
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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

Definitions

  • the present invention relates to a charge / discharge control device for controlling charge / discharge of a plurality of storage batteries.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a charge / discharge control apparatus capable of efficiently controlling charge / discharge of a plurality of storage batteries.
  • a charge / discharge control device is a charge / discharge control device that controls charge / discharge of a plurality of storage batteries connected to a DC bus, and each of the plurality of storage batteries.
  • a target value changing unit that changes the control target value in a timely manner based on a charge ratio indicating a distribution ratio of charge to the storage battery or a discharge ratio indicating a distribution ratio of discharge from the storage battery, and a charge of each of the plurality of storage batteries
  • a control unit that controls the discharge based on the control target value changed in a timely manner.
  • charging / discharging in each storage battery can be appropriately distributed, charging / discharging of a plurality of storage batteries can be controlled efficiently. Moreover, electric power loss can also be suppressed by controlling charging / discharging of a some storage battery efficiently.
  • FIG. 1A is a schematic diagram illustrating a discharge in an example of a configuration of a conventional power storage system
  • FIG. 1B is a diagram illustrating an example of a change in a DC bus voltage when discharged. is there.
  • FIG. 2A is a schematic diagram illustrating charging in an example of a configuration of a conventional power storage system
  • FIG. 2B is a diagram illustrating an example of a change in DC bus voltage when charging. is there.
  • FIG. 3 is a schematic diagram illustrating a problem in the conventional power storage system.
  • FIG. 4 is a block diagram showing a schematic configuration of the charge / discharge control device and the power storage system according to Embodiment 1 of the present invention.
  • FIG. 4 is a block diagram showing a schematic configuration of the charge / discharge control device and the power storage system according to Embodiment 1 of the present invention.
  • FIG. 5 is a block diagram showing the configuration of the charge / discharge controller and the DC / DC converter according to Embodiment 1 of the present invention.
  • FIG. 6 is a block diagram illustrating a detailed configuration of the DC bus voltage control unit according to the first embodiment of the present invention.
  • FIG. 7 is a flowchart showing a flow of operations of the charge / discharge controller according to Embodiment 1 of the present invention.
  • FIG. 8 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 1 of the present invention.
  • FIG. 9 is a diagram illustrating an example of the target current value and DC bus voltage current value acquired for each string, and the calculated DC bus voltage target value and current limit value.
  • FIG. 10 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 2 of the present invention.
  • FIG. 11 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 2 of the present invention.
  • FIG. 12 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 3 of the present invention.
  • FIG. 13 is a diagram showing an example of the relationship between the target value of the battery remaining capacity and the current battery remaining capacity in the third embodiment of the present invention.
  • FIG. 14 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 3 of the present invention.
  • FIG. 11 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 2 of the present invention.
  • FIG. 12 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embod
  • FIG. 15 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 4 of the present invention.
  • FIG. 16 is a diagram illustrating an example of a relationship between a charge switching target value, a discharge switching target value, and a DC bus reference voltage value.
  • FIG. 17 is a schematic diagram illustrating an example of the configuration of a string.
  • FIG. 1A is a schematic diagram showing a discharge in an example of a configuration of a conventional power storage system
  • FIG. 1B is a diagram showing an example of a change in a DC bus voltage when discharged.
  • FIG. 2A is a schematic diagram illustrating charging in an example of a configuration of a conventional power storage system
  • FIG. 2B is a diagram illustrating an example of a change in DC bus voltage when being charged. .
  • a storage system including a plurality of storage battery units includes, for example, a PV 10 such as a solar battery, a DC / DC converter (DC / DC) 20, and a plurality of storage battery units (strings) 30 1 as shown in FIG. , 30 2 ,... 30 n , a DC / AC converter (DC / AC) 40, and a DC bus 50.
  • Each battery unit (strings) 30 n is provided with a DC / DC converter (DC / DC) 31 n and a plurality of battery packs 32 n, 33 n, and a ... 34 n.
  • surplus power supplied from the power system or power generated by PV is charged in the string 30 to supply power to a device (load) that operates on power.
  • the string 30 is discharged. That is, the string 30 is discharged when the electric power Pa output from the DC / AC converter 40 to the load side is larger than the electric power Pb input from the PV 10 to the DC / DC converter 20 side, and the electric power Pa is smaller than the electric power Pb. 30 is charged.
  • the DC / DC converter 31 of each string 30 includes a DC bus voltage sensor (not shown), and each detects a DC bus voltage.
  • Each DC / DC converter 31 controls charging / discharging of the string 30 so that the detected DC bus voltage becomes a preset DC bus reference voltage value (target value in FIGS. 1 and 2). .
  • the DC bus voltage decreases as shown in FIG. 1B, so the DC / DC converter 31 is controlled so as to approach the DC bus reference voltage value, and FIG.
  • FIG. As shown in FIG.
  • Pa ⁇ Pb the DC bus voltage rises as shown in FIG. 2B, so that the DC / DC converter 31 is controlled so as to approach the DC bus reference voltage value, as shown in FIG. You will charge as shown.
  • each string 30 As shown in FIG. 3, there is a problem in that the string to be discharged and the string to be charged are mixed in each string 30 as shown in FIG. As described above, when the charge / discharge directions of the strings 30 are different, there is a problem that electric power that is simply moved between the strings 30 is generated, resulting in a large power loss and a decrease in battery life.
  • the DC / DC converter 31 controls charging / discharging in each string 30, there is a problem that the amount of discharge and the amount of charge between the strings cannot be changed according to the state of the battery pack, for example. .
  • the discharge amount of a string having a battery with large deterioration cannot be made smaller than that of other strings.
  • a charge / discharge control device is a charge / discharge control device that controls charge / discharge of a plurality of storage batteries connected to a DC bus, and the plurality of storage batteries
  • a target value changing unit that changes the control target values of the plurality of storage batteries in a timely manner based on a charge ratio indicating a distribution ratio of charge to the storage battery or a discharge ratio indicating a distribution ratio of discharge from the storage battery,
  • a control unit that controls each charge / discharge based on the control target value changed in a timely manner.
  • charging / discharging in each storage battery can be controlled to be appropriately distributed to each storage battery according to the distribution ratio, charging / discharging of a plurality of storage batteries can be controlled efficiently. Moreover, electric power loss can also be suppressed by controlling charging / discharging of a some storage battery efficiently. Furthermore, for example, by changing the distribution ratio, the state of each storage battery can be reflected and the charge / discharge can be controlled.
  • the target value changing unit includes a power acquisition unit that acquires an input power value input to the DC bus and an output power value output from the DC bus, and a required overall power value as the input power value and the An overall power calculation unit for calculating based on the output power value; an overall current calculation unit for calculating an overall current value based on a preset DC bus reference voltage value and the overall power value; and a plurality of storage batteries.
  • a target current calculation unit that calculates a target current value at the time of charging / discharging based on the charging rate or the discharging rate of the storage battery from the total current value, and changes the control target value in a timely manner based on the target current value. You may provide a change part.
  • control target value is a current limit value at the time of charging / discharging in each of the plurality of storage batteries
  • the charge / discharge control device further acquires a current value of the DC bus voltage that is a current voltage value of the DC bus.
  • a current value acquisition unit for DC bus voltage, and the target value changing unit further determines a current limit value for each of the plurality of storage batteries as the DC bus reference voltage value, the target current value, and the DC bus voltage current value.
  • a current limit value calculation unit that calculates a current limit value based on the calculated current limit value, and the control unit uses the current limit value that is changed in a timely manner. You may control charging / discharging in each of these.
  • the current limit value calculating unit calculates a charging current limit value and a discharging current limit value in each of the plurality of storage batteries as the current limit value, and the control unit is equal to or more than the charging current limit value. You may control charging / discharging in each of these storage batteries in the range below the electric current limit value for discharge.
  • control target value is a DC bus voltage target value at the time of charging / discharging in each of the plurality of storage batteries
  • target value changing unit further includes a DC bus voltage at the time of charging / discharging in each of the plurality of storage batteries.
  • a target value is calculated based on the DC bus reference voltage value and the target current value, and includes a DC bus voltage target value calculation unit that changes a current DC bus voltage target value with the calculated DC bus voltage target value,
  • the control unit controls charging / discharging in each of the plurality of storage batteries by controlling the DC bus voltage at the time of charging / discharging in each of the plurality of storage batteries based on the DC bus voltage target value changed in a timely manner. May be.
  • the charge / discharge control device further includes a DC bus voltage current value acquisition unit that acquires a current value of the DC bus voltage that is a current voltage value of the DC bus, and the control unit includes the current value of the DC bus voltage during discharging.
  • a DC bus voltage current value acquisition unit that acquires a current value of the DC bus voltage that is a current voltage value of the DC bus
  • the control unit includes the current value of the DC bus voltage during discharging.
  • control target value is the target current value at the time of charging / discharging in each of the plurality of storage batteries
  • target value changing unit further calculates a DC bus voltage current value that is a current voltage value of the DC bus.
  • a DC bus voltage current value acquisition unit to acquire; and a target current correction unit that corrects the target current value based on the DC bus reference voltage value and the DC bus voltage current value, and the control unit is corrected.
  • the charging / discharging in each of the plurality of storage batteries may be controlled using the target current value.
  • control target value is a current limit value at the time of charging / discharging in each of the plurality of storage batteries
  • the target value changing unit acquires a remaining battery capacity of each of the plurality of storage batteries.
  • Current limit value is calculated based on the obtained battery remaining capacity and a preset target battery remaining capacity value, and the current limit value is changed by the calculated current limit value.
  • a calculation unit, and the control unit may control charging / discharging of each of the plurality of storage batteries using the current limit value changed in a timely manner.
  • the control unit may be provided in each of the plurality of storage batteries, and may control charging / discharging in the storage battery based on the control target value.
  • the charge / discharge control device is a charge / discharge control device that controls charging / discharging of a plurality of storage batteries connected to a DC bus, and each control target value of the plurality of storage batteries is determined by: A target value changing unit that changes timely based on a charge rate that indicates a distribution rate of charge to the storage battery or a discharge rate that indicates a distribution rate of discharge from the storage battery, and each charge and discharge of the plurality of storage batteries is changed timely
  • the control target value is a DC bus voltage target value at the time of charging / discharging in each of the plurality of storage batteries
  • the target value changing unit further includes: The DC bus voltage target value at the time of charging / discharging in each of the plurality of storage batteries is calculated based on the DC bus reference voltage value and the target current value, and the calculated DC bus voltage target value is A DC bus voltage target value calculation unit that changes a current DC bus voltage target value, and the control unit changes the DC bus voltage at the time of charging and discharging
  • FIG. 4 is a block diagram showing a schematic configuration of the charge / discharge control device and the power storage system according to Embodiment 1 of the present invention.
  • the power storage system including a plurality of storage battery units includes a PV 10, a DC / DC converter (DC / DC) 20, a plurality of storage battery units (strings) 60 1 , 60 2 ,... 60 n , DC / AC A converter (DC / AC) 40, a DC bus 50, and a charge / discharge controller 100 are provided.
  • Each string 60 n includes a DC / DC converter (DC / DC) 200 n and a plurality of battery packs 32 n , 33 n ,... 34 n .
  • the PV 10 is, for example, a solar cell that generates power by directly converting solar energy into electric energy.
  • the DC / DC converter 20 converts the DC power voltage supplied from the PV 10 into a predetermined voltage and outputs the voltage to the DC bus 50.
  • the DC / AC converter 40 converts the DC power supplied from the DC bus 50 into AC power and outputs the AC power to the load side.
  • the function of the charge / discharge control device is realized by the charge / discharge controller 100 and a plurality of DC / DC converters 200 1 , 200 2 ,... 200 n .
  • FIG. 5 is a block diagram showing the configuration of the charge / discharge controller and the DC / DC converter according to Embodiment 1 of the present invention.
  • FIG. 5 for simplicity of explanation, it is shown only for the DC / DC converter 200 i of the plurality of DC / DC converter 200 1, 200 2, ... 200 n.
  • I is an arbitrary natural number from 1 to n.
  • the charge / discharge controller 100 includes a power acquisition unit 101, an overall power calculation unit 102, an overall current calculation unit 103, a target current calculation unit 104, a target current setting unit 105, a battery information acquisition unit 106, and a battery state calculation.
  • Unit 107 and ratio determining unit 108 are components that determine the ratio of the charge / discharge controller 100.
  • the power acquisition unit 101 acquires the power value Pb input from the DC / DC converter 20 to the DC bus 50 and the power value Pa output from the DC bus to the DC / AC converter 40.
  • the overall power calculation unit 102 calculates the overall power value Ps required as a whole by subtracting the power value Pb from the power value Pa as shown in the following equation 1.
  • the total current calculation unit 103 calculates the string total current value (total current value) I based on a preset DC bus reference voltage value (for example, 500 V) and the total power value Ps as shown in the following Expression 2. To do.
  • the battery information acquisition unit 106 acquires battery information such as a battery voltage value and a current value of the battery packs 32 i , 33 i ,... 34 i of the string 60 i .
  • the battery state calculation unit 107 calculates the degree of battery deterioration and the remaining battery capacity of the string 60 i based on the battery information acquired by the battery information acquisition unit 106.
  • the ratio determination unit 108 calculates the charge ratio Rc i indicating the distribution ratio of charge to the string 60 i and the discharge ratio Rd i indicating the distribution ratio of discharge from each string 60 i by the string calculated by the battery state calculation unit 107. It is determined based on the deterioration degree of the battery of 60 i and the remaining battery capacity.
  • the target current calculation unit 104 sets the target current value I i at the time of charging / discharging in the string 60 i from the overall current value I according to the charging rate Rc i or the discharging rate Rd i as shown in the following formulas 3 to 5, respectively. calculate.
  • target current value I i total current value I ⁇ discharge ratio Rd i (Equation 3)
  • target current value I i total current value I ⁇ charge ratio Rc i (Expression 4)
  • I 0
  • Target current value I i 0 (Expression 5)
  • Target current setting unit 105 notifies the target current value I i to the corresponding string 60 i.
  • the DC / DC converter 200 i includes a target current acquisition unit 201 i , a DC bus voltage target value calculation unit 202 i , a DC bus voltage control unit 203 i , and a DC bus voltage current value acquisition unit 204 i. , And a current limit value calculation unit 205 i .
  • the target current acquisition unit 201 i acquires the target current value I i notified from the charge / discharge controller 100.
  • the DC bus voltage target value calculation unit 202 i calculates the DC bus voltage target value V i at the time of charging / discharging in the string 60 i based on the DC bus reference voltage value and the target current value I i as shown in the following Expression 6. To do.
  • k1 is an arbitrary fixed value.
  • the DC bus voltage current value acquisition unit 204 i acquires a DC bus voltage current value that is a current voltage value of the DC bus 50.
  • the current limit value calculation unit 205 represents the current limit value Il i at the time of charging / discharging in the string 60 i based on the target current value I i , the DC bus reference voltage value, and the DC bus voltage current value as shown in Equation 7 below. To calculate.
  • k2 is an arbitrary fixed value.
  • DC bus voltage controller 203 i by passing a current proportional to the deviation between the DC bus voltage target value V i and DC bus voltage current value, and controls the DC bus voltage.
  • FIG. 6 is a block diagram showing a detailed configuration of the DC bus voltage control unit according to the first embodiment of the present invention.
  • the DC bus voltage control unit 203 i includes a PID control unit 210 i , a current limit control unit 211 i , a PWM (Pulse Width Modulation) 212 i , and a power module 213 i .
  • PID control unit 210 i is, PID using DC bus voltage target value DC bus voltage current value obtained by the calculated DC bus voltage target value V i and DC bus voltage current value acquiring unit 204 i by the calculating unit 202 i Take control.
  • the current limit control unit 211 i controls the current so as not to exceed the current limit value Il i calculated by the current limit value calculation unit 205 i .
  • the PWM 212 i performs pulse width modulation and outputs a PWM waveform.
  • the power module 213 i is an IGBT (Insulated-Gate Bipolar Transistors), for example, and controls the output based on the PWM waveform output from the PWM 212 i .
  • FIG. 7 is a flowchart showing a flow of operations of the charge / discharge controller according to Embodiment 1 of the present invention.
  • the battery information acquisition unit 106 acquires battery information such as a battery voltage value and a current value of the battery packs 32 i , 33 i ,... 34 i of the string 60 i (step S101).
  • the battery state calculation unit 107 calculates the degree of battery degradation and the remaining battery capacity of the string 60 i based on the battery information acquired by the battery information acquisition unit 106 (step S102).
  • Ratio determining unit 108, the discharge rate Rd i indicating the distribution ratio of the discharge from the charging rate Rc i and string 60 i shows the distribution ratio of the charging of the string 60 i, string calculated by the battery state calculator 107 60 It is determined based on the degree of deterioration of the battery i and the remaining battery capacity (step S103).
  • the overall distribution ratio by making the distribution ratio smaller than the other strings 60 j so that the string 60 i having a large degree of battery degradation is not used as much as possible. Further, for example, as each of the remaining battery capacity of a plurality of strings 60 1 ⁇ n becomes uniform, for the remaining battery capacity is low string 60 l compared to other strings 60 k, the other strings 60 k In comparison with this, it is possible to determine a larger charge ratio (that is, Rc 1 > Rc k ) and a lower discharge ratio (that is, Rd 1 ⁇ Rd k ).
  • “j”, “k”, and “l” are arbitrary natural numbers between 1 and n different from each other and different from “i”.
  • the power acquisition unit 101 acquires a power value Pb input from the DC / DC converter 20 to the DC bus 50 and a power value Pa output from the DC bus to the DC / AC converter 40 using a sensor or the like (step) S104).
  • the total power calculation unit 102 calculates the total power value Ps required as a whole by subtracting the power value Pb from the power value Pa as described above (step S105).
  • the total current calculation unit 103 calculates the total current value I based on the DC bus reference voltage value and the total power value Ps as described above (step S106).
  • the target current calculation unit 104 calculates the target current value I i at the time of charging / discharging in the string 60 i from the overall current value I in accordance with the charging rate Rc i or the discharging rate Rd i as described above (step S107).
  • the target current setting unit 105 notifies the corresponding string 60 i of the target current value I i calculated by the target current calculation unit 104 (step S108). It is determined whether or not the fixed period A has elapsed (step S109). If the predetermined constant period A has not elapsed (No in step S109), the determination is repeated until the predetermined constant period A has elapsed.
  • step S110 it is determined whether or not the predetermined fixed period B has elapsed (step S110).
  • the process returns to the battery information acquisition process (step S101).
  • the predetermined fixed period B has not elapsed (No in step S110)
  • the process returns to the process of acquiring the power value Pb and the power value Pa (step S104).
  • the fixed period A and the fixed period B are set in advance, and the fixed period B (for example, 100 ms) is set longer than the fixed period A (for example, 5 ms). Moreover, the fixed period A and the fixed period B can be changed.
  • FIG. 8 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 1 of the present invention.
  • the target current acquisition unit 201 i acquires the target current value I i notified from the charge / discharge controller 100 (step S201).
  • the DC bus voltage current value acquisition unit 204 i acquires a DC bus voltage current value that is a current voltage value of the DC bus 50 (step S202).
  • the DC bus voltage target value calculation unit 202 i calculates the DC bus voltage target value V i at the time of charging / discharging in the string 60 i as described above based on the DC bus reference voltage value and the target current value I i (step). S203).
  • the current limit value calculation unit 205 i calculates the current limit value Il i during charging / discharging in the string 60 i based on the target current value I i , the DC bus reference voltage value, and the DC bus voltage current value as described above. (Step S204).
  • the DC bus voltage control unit 203 i controls the DC bus voltage at the time of charging / discharging in the string 60 i based on the DC bus voltage target value V i , the DC bus voltage current value, and the current limit value Il i (step S205). ). It is determined whether or not the fixed period C has elapsed (step S206). If the predetermined constant period C has not elapsed (No in step S206), the determination is repeated until the predetermined constant period C has elapsed.
  • the process returns to the target current value I i acquisition process (step S201).
  • the fixed period C is also set in advance, and the fixed period C (for example, 1 ms) is set shorter than the fixed period A and the fixed period B, but is not limited thereto. Further, the fixed period C can be changed.
  • each step in the flowcharts of FIG. 7 and FIG. 8 described above is described as being performed only for the string 60 i for simplicity, but these steps are performed for a plurality of strings 60 1 , 60 2 ,. This is done for all 60 n .
  • the DC bus reference voltage value is 500 V
  • the constant k1 is “0.1”
  • the constant k2 is “1”.
  • the DC bus voltage target value V is calculated as an example when the ratio is determined to be 3: 2: 1: 0 and the power acquisition unit 101 acquires the power value Pb of 10 kW and the power value Pa of 40 kW. 1 to V 4 and current limit values Il 1 to Il 4 will be described.
  • FIG. 9 shows target current values I 1 to I 4 and DC bus voltage current values acquired for each of the four strings 60 1 to 60 4 , calculated DC bus voltage target values V 1 to V 4, and current limit values. is a diagram illustrating an example of the Il 1 ⁇ Il 4.
  • the total power calculation unit 102 calculates the total power value Ps as 30 kw. Further, since the DC bus reference voltage value is 500V and the total power value Ps is 30 kW, the total current calculation unit 103 calculates the total current value I as 60A. Also, the entire current I is 60A, the discharge ratio is 3: 2: 1: 0, and thus the target current calculating unit 104, each of the strings 60 1 to 60 4 of the target current value I 1 ⁇ I 4 is 30A, 20A 10A and 0A are calculated respectively.
  • DC bus reference voltage value is 500V
  • constant k1 is "0.1”
  • a target current value I 1 of the strings 60 1 because it is 30A
  • DC bus voltage desired value calculating unit 202 1 of the strings 60 1 DC becomes the bus voltage target value V 1 to be calculated and 503V.
  • the DC bus voltage target value calculation portion 202 2 of the strings 60 2 becomes the DC bus voltage target value V 2 to be calculated and 502V.
  • DC bus voltage target value calculation portion 202 3 of the string 60 consisting of DC bus voltage target value V 3 to be calculated and 501V.
  • DC bus voltage target value calculating section 202 fourth string 6O4 becomes a DC bus voltage target value V 4 to be calculated and 500V.
  • the current DC bus voltage value is acquired as 498.7V, 498.1V, 498.4V, 498.5V by the DC bus voltage current value acquisition units 204 1 to 204 4 , respectively.
  • the current limit value calculation unit 205 1 calculates the current limit value Il 1 as 31.3 A. Will do.
  • the current limit value calculation unit 205 and second strings 60 2 becomes the current limit value Il 2 to be calculated with 21.9A.
  • the current limit value calculation unit 205 3 of the string 60 3 calculates the current limit value Il 3 as 11.6A.
  • String 60 4 current limit value calculation unit 205 4 will be calculated the current limit value Il 4 and 0A.
  • DC bus voltage target values V 1 to V 4 and current limit values Il 1 to Il 4 are calculated from the target current values I 1 to I 4 in each of the four strings 60 1 to 60 4 .
  • a DC bus voltage target value calculated in a timely manner for each of a plurality of strings is used.
  • charge / discharge in each string can be appropriately distributed, so that charge / discharge of a plurality of storage batteries can be controlled efficiently.
  • a rapid change in the DC bus voltage can be suppressed by changing the current limit value in accordance with the deviation between the DC bus reference voltage value and the DC bus voltage current value.
  • the DC bus voltage target value V i and the current limit value Il i are calculated in the DC / DC converter 200 i of the string 60 i .
  • the present invention is not limited to this.
  • it may be configured to notify the string 60 i.
  • the charge / discharge controller 100 calculates the target current value I i .
  • the present invention is not limited to this.
  • the target current value I i is calculated based on the total current value I, the charge rate Rc i , and the discharge rate Rd i notified from the charge / discharge controller 100. You may comprise.
  • the target current value I i is calculated based on the total power value Ps, the charge rate Rc i , and the discharge rate Rd i notified from the charge / discharge controller 100. You may comprise so that it may do.
  • the DC / DC converter 200 i calculates the total current value I from the total power value Ps, the calculated total current value I, and the charge ratio Rc i and discharge ratio Rd i notified from the charge / discharge controller 100. Based on this, the target current value I i is calculated.
  • the DC bus voltage target value V i is calculated in the DC / DC converter 200 i of the string 60 i .
  • the DC bus voltage target value V i may not be calculated.
  • the current limit value Ild i (for discharge) and the current limit value Ilc i are calculated from the deviation between the target current and the DC bus reference voltage value and the DC bus voltage current value, as shown in the following equations 8 to 9. Calculate (for charging).
  • k2 is an arbitrary fixed value.
  • DC / DC converter 200 i the current limit value Ild i (for discharge) or less, and in a range equal to or more than the current limit value Ilc i (charging), and controlled so as to approach the DC bus reference voltage value.
  • the DC bus voltage target value and the current limit value are calculated in the DC / DC converter of each string, and the DC bus voltage is controlled using the DC bus voltage target value and the current limit value.
  • the target current is corrected, and the DC bus voltage is controlled using the corrected target current.
  • the schematic configurations of the charge / discharge control device and the power storage system in the second embodiment are the same as those in the first embodiment shown in FIG.
  • the DC / DC converter 300 according to the second embodiment is obtained by replacing the DC / DC converter 200 shown in FIG.
  • FIG. 10 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 2 of the present invention.
  • symbol is attached
  • the charge / discharge controller 100 is the same as that of the first embodiment shown in FIG. In FIG. 10, for simplicity of explanation, it is shown only for the DC / DC converter 300 i of the plurality of DC / DC converter 300 1, 300 2, ... 300 n. “I” is an arbitrary natural number from 1 to n.
  • the DC / DC converter 300 i includes a target current acquisition unit 201 i , a DC bus voltage current value acquisition unit 204 i , a target current correction unit 301 i , and a constant current control unit 302 i as shown in FIG. Yes.
  • Target current correcting unit 301 i the string 60 the target current value I i at i, corrected as shown by the following formula 10 based on the DC bus reference voltage, and the DC bus voltage current value, the corrected target current value I i 'calculate.
  • k2 is an arbitrary fixed value.
  • the constant current control unit 302 controls the DC bus voltage by flowing a current based on the corrected target current value I i ′.
  • FIG. 11 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 2 of the present invention.
  • the operation of charge / discharge controller 100 is the same as that of the first embodiment.
  • the target current acquisition unit 201 i acquires the target current value I i notified from the charge / discharge controller 100 (step S201).
  • the DC bus voltage current value acquisition unit 204 acquires a DC bus voltage current value that is a current voltage value of the DC bus 50 (step S202).
  • Target current correcting unit 301 i is a target current value I i of the string 60 i, DC bus reference voltage, and DC based bus voltage on the current value is corrected as described above, the corrected target current value I i 'is calculated (Step S301).
  • the constant current control unit 302 i controls the DC bus voltage by flowing a current based on the corrected target current value I i ′ (step S302).
  • FIG. 12 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 3 of the present invention.
  • symbol is attached
  • the function of the charge / discharge control device is realized by the charge / discharge controller 100 and the plurality of DC / DC converters 400 1 , 400 2 ,... 400 n .
  • the charge / discharge controller 100 is the same as that of the first embodiment shown in FIG. In FIG. 12, for simplicity of explanation, it is shown only for the DC / DC converter 400 i of the plurality of DC / DC converter 400 1, 400 2, ... 400 n. “I” is an arbitrary natural number from 1 to n.
  • the DC / DC converter 400 i includes a target current acquisition unit 401 i , a DC bus voltage target value calculation unit 202 i , a DC bus voltage control unit 203 i , and a DC bus voltage current value acquisition unit 204 i. , A current limit value calculation unit 402 i , and a battery remaining capacity acquisition unit 403 i .
  • the target current acquisition unit 401 i acquires the target current value I i notified from the charge / discharge controller 100. Further, the target current acquisition unit 401 i notifies the current limit value calculation unit 402 i and the battery remaining capacity acquisition unit 403 i when the target current value I i cannot be acquired.
  • the battery remaining capacity acquisition unit 403 i acquires the battery remaining capacity (SOC: State of Charge) of the batteries (battery packs 32 i , 33 i ,... 34 i ) included in the DC / DC converter 400 i , and the current limit value Notify the calculation unit 402 i .
  • SOC State of Charge
  • the current limit value calculation unit 402 i uses the current limit value Il i at the time of charging / discharging in the string 60 i as the first embodiment based on the target current value I i , the DC bus reference voltage value, and the DC bus voltage current value. Calculate in the same way. Further, when the target current value I i cannot be acquired, the current limit value calculation unit 402 i uses a preset target battery remaining capacity value and a remaining battery capacity acquisition unit 403 i as shown in FIG. A current limit value Il i ′ is calculated from the acquired current remaining battery capacity.
  • FIG. 14 is a flowchart showing a flow of operation of the DC / DC converter according to Embodiment 3 of the present invention.
  • the target current acquisition unit 201 i acquires the target current value I i notified from the charge / discharge controller 100 (step S201).
  • the DC bus voltage current value acquisition unit 204 i acquires a DC bus voltage current value that is a current voltage value of the DC bus 50 (step S202).
  • the target current acquisition unit 201 i determines whether or not the target current value I i has been acquired (step S401).
  • the DC bus voltage target value calculation unit 202 i is configured to charge the DC bus voltage at the time of charging / discharging in the string 60 i as in the embodiment.
  • the target value V i is calculated as described above based on the DC bus reference voltage value and the target current value I i (step S203).
  • the current limit value calculation unit 205 i calculates the current limit value Il i during charging / discharging in the string 60 i based on the target current value I i , the DC bus reference voltage value, and the DC bus voltage current value as described above.
  • the DC bus voltage control unit 203 i controls the DC bus voltage at the time of charging / discharging in the string 60 i based on the DC bus voltage target value V i , the DC bus voltage current value, and the current limit value Il i (step S205). ). It is determined whether or not the fixed period C has elapsed (step S206).
  • step S206 If the predetermined constant period C has not elapsed (No in step S206), the determination is repeated until the predetermined constant period C has elapsed.
  • the process returns to the target current value I i acquisition process (step S201).
  • the current limit value calculation unit 402 i uses the preset target value of the battery remaining capacity and the battery remaining capacity acquisition unit 403 i .
  • a current limit value Il i ′ is calculated from the acquired current remaining battery capacity. For example, if the current battery remaining capacity is greater than the target value of the battery remaining capacity, the battery remaining capacity acquisition unit 403 i increases the current limit value Il i that has already been calculated, and the current battery remaining capacity is If less than the target value, and calculates the current limit value Il i 'to decrease the current limit value Il i (step S402).
  • the DC bus voltage control unit 203 i controls the DC bus voltage during charging / discharging in the string 60 i based on the DC bus reference voltage value, the DC bus voltage current value, and the current limit value Il i ′ (step S403). .
  • it is determined whether or not the fixed period C has passed step S206. If the predetermined constant period C has not elapsed (No in step S206), the determination is repeated until the predetermined constant period C has elapsed. When the predetermined fixed period C has elapsed (Yes in step S206), the process returns to the target current value I i acquisition process (step S201).
  • the current limit value can be changed even when the target current cannot be acquired. Therefore, charge / discharge of a plurality of storage batteries can be efficiently controlled using the DC bus reference voltage value and the current limit value.
  • the DC bus voltage is controlled using the DC bus voltage target value and the current limit value.
  • the present invention is not limited to this. Absent.
  • the DC bus voltage may be controlled using only the current limit value calculated from the target value of the battery remaining capacity and the current battery remaining capacity and the DC bus reference voltage value without using the DC bus voltage target value. I do not care. Thereby, charging / discharging of a some storage battery can be controlled efficiently easily.
  • FIG. 15 is a block diagram showing configurations of the charge / discharge controller and the DC / DC converter according to Embodiment 4 of the present invention.
  • symbol is attached
  • the function of the charge / discharge control device is realized by the charge / discharge controller 100 and the DC / DC converters 500 1 , 500 2 ,... 500 n .
  • the charge / discharge controller 100 is the same as that of the first embodiment shown in FIG. In FIG. 15, for simplicity of explanation, it is shown only for the DC / DC converter 500 i of the plurality of DC / DC converter 500 1, 500 2, ... 500 n. “I” is an arbitrary natural number from 1 to n.
  • the DC / DC converter 500 i includes a target current acquisition unit 201 i , a DC bus voltage target value calculation unit 202 i , a DC bus voltage current value acquisition unit 204 i , and a current limit value calculation unit 205 i. , A direction switching determination unit 501 i and a DC bus voltage control unit 502 i .
  • Direction switching determination unit 501 i when the DC bus voltage current value acquired by the DC bus voltage current value acquiring unit 204 i has exceeded the preset charge switching target value as shown in FIG. 16, from the discharge Instructs the DC bus voltage controller 203 i to switch to the charging direction.
  • the direction switching determination unit 501 i switches from charging to discharging direction when the DC bus voltage current value acquired by the DC bus voltage current value acquiring unit 204 i falls below a preset discharge switching target value.
  • To the DC bus voltage control unit 203 i To the DC bus voltage control unit 203 i .
  • the charge switching target value and the discharge switching target value are calculated as shown in the following equations 11-12.
  • the DC bus voltage control unit 502 i controls the DC bus voltage by flowing a current proportional to the deviation between the DC bus voltage target value V i and the current DC bus voltage value. Further, the DC bus voltage control unit 502 i switches the direction of the flowing current when instructed by the direction switching determination unit 501 i to switch from discharging to charging or from charging to discharging.
  • each embodiment demonstrates using the schematic structure of the charging / discharging control apparatus and electrical storage system shown in FIG. 4, and although the string 60 is set as the structure which connects a some battery pack in series, it is restricted to this. It is not a thing.
  • a configuration may be adopted in which a plurality of battery packs are connected in series as in a string 70 shown in FIG. 17 and connected in parallel, or a configuration in which a plurality of battery packs are connected in parallel as in a string 80 may be adopted. Absent.
  • the present invention can efficiently control charge / discharge of a plurality of storage batteries, and is useful for use in a charge / discharge control device, a power storage system, and the like.

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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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un appareil de commande de charge/décharge, qui peut efficacement commander la charge/décharge d'une pluralité d'accumulateurs de stockage. L'appareil de commande de charge/décharge comprend un contrôleur de charge/décharge (100) et un convertisseur continu-continu (200i). Le contrôleur de charge/décharge (100) comprend une unité de calcul de courant total (103) qui calcule la valeur de courant total à partir d'une valeur de tension de référence d'un bus continu et de la valeur de courant total, et une unité de calcul de courant cible (104) qui calcule des valeurs de courant cible pour chacune d'une pluralité des chaînes (60i) à partir de la valeur de courant total, en fonction du rapport de charge et du rapport de décharge. Le convertisseur continu-continu (200i) comprend une unité de calcul de valeur cible de la tension du bus continu (202i) qui calcule une valeur cible de la tension du bus continu à partir des valeurs de courant cible et de la valeur de la tension de référence du bus continu, une unité de calcul de la valeur limite de courant (205i) qui calcule une valeur limite de courant à partir des valeurs de courant cible, etc., et une unité de commande de la tension du bus continu (203i) qui commande la tension du bus continu en utilisant la valeur cible de la tension du bus continu.
PCT/JP2013/001930 2012-03-26 2013-03-21 Appareil de commande de charge/décharge, système de stockage d'électricité et procédé de commande de charge/décharge WO2013145658A1 (fr)

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JP2016063717A (ja) * 2014-09-22 2016-04-25 住友電気工業株式会社 蓄電システム
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WO2018225417A1 (fr) * 2017-06-08 2018-12-13 パナソニックＩｐマネジメント株式会社 Système de stockage d'énergie et dispositif de commande
WO2019103059A1 (fr) * 2017-11-21 2019-05-31 国立研究開発法人理化学研究所 Système de commande de bus à courant continu
JP2021010227A (ja) * 2019-06-28 2021-01-28 パナソニックＩｐマネジメント株式会社 蓄電池システム、制御方法、及びプログラム
WO2021200902A1 (fr) * 2020-03-31 2021-10-07 国立研究開発法人理化学研究所 Système de commande de bus à courant continu
CN113872258A (zh) * 2020-06-30 2021-12-31 比亚迪股份有限公司 电池均流控制方法及电池均流控制系统
EP4300754A4 (fr) * 2021-03-26 2024-04-17 Huawei Digital Power Tech Co Ltd Système de stockage d'énergie et procédé de commande associé

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US20130113437A1 (en) * 2011-11-07 2013-05-09 Sony Corporation Control apparatus, control method and control system
US9929570B2 (en) * 2011-11-07 2018-03-27 Sony Corporation Control apparatus to control discharge from battery units
JP2017505098A (ja) * 2014-01-17 2017-02-09 ブルー ソリューションズ 複数のエネルギ貯蔵アセンブリを管理するための方法及びそのシステム
CN106461729A (zh) * 2014-01-17 2017-02-22 布鲁技术公司 用于管理多个能量储存组件的方法和系统
JP2016063717A (ja) * 2014-09-22 2016-04-25 住友電気工業株式会社 蓄電システム
WO2018225417A1 (fr) * 2017-06-08 2018-12-13 パナソニックＩｐマネジメント株式会社 Système de stockage d'énergie et dispositif de commande
CN110710050B (zh) * 2017-06-08 2023-02-17 松下知识产权经营株式会社 蓄电系统、管理装置
CN110710050A (zh) * 2017-06-08 2020-01-17 松下知识产权经营株式会社 蓄电系统、管理装置
JPWO2018225417A1 (ja) * 2017-06-08 2020-04-09 パナソニックＩｐマネジメント株式会社 蓄電システム、管理装置
JPWO2019103059A1 (ja) * 2017-11-21 2020-11-19 国立研究開発法人理化学研究所 直流バス制御システム
CN111448733A (zh) * 2017-11-21 2020-07-24 国立研究开发法人理化学研究所 直流总线控制系统
EP3716435A4 (fr) * 2017-11-21 2021-04-07 Riken Système de commande de bus à courant continu
US11133673B2 (en) 2017-11-21 2021-09-28 Riken Direct current bus control system
AU2018373453B2 (en) * 2017-11-21 2021-12-09 Riken Direct-current bus control system
WO2019103059A1 (fr) * 2017-11-21 2019-05-31 国立研究開発法人理化学研究所 Système de commande de bus à courant continu
JP2021010227A (ja) * 2019-06-28 2021-01-28 パナソニックＩｐマネジメント株式会社 蓄電池システム、制御方法、及びプログラム
JP7390545B2 (ja) 2019-06-28 2023-12-04 パナソニックＩｐマネジメント株式会社 蓄電池システム、制御方法、及びプログラム
WO2021200902A1 (fr) * 2020-03-31 2021-10-07 国立研究開発法人理化学研究所 Système de commande de bus à courant continu
CN113872258A (zh) * 2020-06-30 2021-12-31 比亚迪股份有限公司 电池均流控制方法及电池均流控制系统
EP4300754A4 (fr) * 2021-03-26 2024-04-17 Huawei Digital Power Tech Co Ltd Système de stockage d'énergie et procédé de commande associé

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