WO2018155442A1 - Système d'alimentation en cc - Google Patents

Système d'alimentation en cc Download PDF

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Publication number
WO2018155442A1
WO2018155442A1 PCT/JP2018/006016 JP2018006016W WO2018155442A1 WO 2018155442 A1 WO2018155442 A1 WO 2018155442A1 JP 2018006016 W JP2018006016 W JP 2018006016W WO 2018155442 A1 WO2018155442 A1 WO 2018155442A1
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WO
WIPO (PCT)
Prior art keywords
value
power
charging
charge
control unit
Prior art date
Application number
PCT/JP2018/006016
Other languages
English (en)
Japanese (ja)
Inventor
祐樹 石倉
修市 田川
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201880005829.7A priority Critical patent/CN110140273A/zh
Priority to JP2019501345A priority patent/JP6795082B2/ja
Publication of WO2018155442A1 publication Critical patent/WO2018155442A1/fr

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Classifications

    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/20—Systems characterised by their energy storage means
    • 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
    • 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

  • This invention relates to a DC power supply system.
  • Patent Document 1 the voltage of the unit cell of the storage battery pack and the series voltage of the storage battery pack in the power storage unit are compared with the upper limit value and the lower limit value, respectively, and if the upper limit value is exceeded, the charging process of the power storage unit is stopped However, when the value is less than the lower limit, the discharging process of the power storage unit is stopped.
  • the present invention has been made to solve the above-described problem, and provides a DC power feeding system that can prevent a system from being stopped even when the power consumption of a DC load suddenly decreases. Objective.
  • a first aspect of the present invention includes a DC bus line to which a DC load can be connected, a power generator for supplying power to the DC bus line, a secondary battery capable of supplying power to the DC bus line, A controller that controls charging / discharging of the secondary battery, and the controller charges until the charge amount of the secondary battery reaches a predetermined charge set value lower than a predetermined charge allowable upper limit value.
  • the current value is controlled so as not to exceed the first value, and when the charge amount exceeds the charge setting value, the charge current value is set to a second value lower than the first value. It is characterized by controlling.
  • FIG. 1 It is a figure showing a schematic structure of a direct-current power supply system of a 1st embodiment concerning the present invention. It is a figure explaining operation
  • SOC State
  • FIG. 1 is a diagram illustrating a schematic configuration of a DC power supply system 100 according to the present embodiment.
  • the DC power supply system 100 includes a solar cell 1, a PV converter 2, a lithium ion battery 3, a bidirectional DC-DC converter 4, an HVDC bus 5, and a DC load 6. Yes.
  • the DC power supply system 100 is connected between the control unit 7, the bidirectional DC-AC converter 8, the CAN bus 9, the power system 10, and the bidirectional DC-AC converter 8 and the power system 10.
  • AC load 11 is provided.
  • the solar cell 1 as the power generation device, for example, a silicon-based solar cell or a compound semiconductor-based CIS solar cell composed of copper (Cu), indium (I), selenium (Se), or the like is used.
  • the PV (Photovoltaic) converter 2 performs maximum power point tracking (MPPT: Maximum ⁇ ⁇ ⁇ ⁇ Power Point Tracking) control on the output power of the solar cell 1 and supplies power to the HVDC bus 5.
  • MPPT Maximum ⁇ ⁇ ⁇ ⁇ Power Point Tracking
  • the lithium ion battery 3 as a secondary battery is a rechargeable storage battery.
  • As the secondary battery in addition to the lithium ion battery 3, another type of storage battery such as a sodium-sulfur battery may be used.
  • the bidirectional DC-DC converter 4 is connected to the lithium ion battery 3 and the HVDC bus 5, converts the voltage value of the output voltage of the lithium ion battery 3 into a predetermined voltage value, and supplies it to the HVDC bus 5. Further, the voltage value of the voltage supplied via the HVDC bus 5 is converted into a predetermined voltage value and supplied to the lithium ion battery 3.
  • the HVDC bus 5 as a DC bus line is a bus for high-voltage DC power supply (HVDC: High-Voltage Direct Current), and includes a PV converter 2, a bidirectional DC-DC converter 4, a DC load 6, and a bidirectional DC- Connected to the AC converter 8.
  • HVDC High-Voltage Direct Current
  • the direct current load 6 is a device capable of direct current drive connected to the HVDC bus 5, and examples thereof include a refrigerator and an air conditioner.
  • the control unit 7 includes, for example, a CPU, a ROM, a RAM, and the like.
  • the control unit 7 is connected to the PV converter 2, the bidirectional DC-DC converter 4, and the bidirectional DC-AC converter 8 through the CAN bus 9, and controls these converters.
  • the bidirectional DC-AC converter 8 as a DC-AC converter is connected to the power system 10 and the HVDC bus 5, converts the AC voltage supplied from the power system 10 into a DC voltage, and supplies the DC voltage to the HVDC bus 5.
  • the bidirectional DC-AC converter 8 converts the DC voltage supplied to the HVDC bus 5 into an AC voltage and supplies the AC voltage to the AC load 11 or reversely flows to the power system 10.
  • a CAN (Controller Area Network) bus 9 is connected to the PV converter 2, the bidirectional DC-DC converter 4, the control unit 7, and the bidirectional DC-AC converter 8, and is used as a transmission path for signals such as control signals.
  • Electric power system 10 is supplied with a commercial AC voltage such as 200V.
  • the DC voltage of the solar cell 1 supplied via the HVDC bus 5 can be converted into an AC voltage by the bidirectional DC-AC converter 8 and flown back to the power system 10.
  • the DC power supply system 100 supplies the internal current and voltage with DC, so that a switch such as a relay is not necessary, and the switching of the power supply path is necessary.
  • the power supply route can be switched seamlessly.
  • FIG. 2 is a diagram for explaining the steady-state operation in the DC power supply system 100.
  • FIG. 3 is a diagram for explaining the operation when the power consumption of the DC load 6 is reduced in the DC power supply system 100.
  • FIG. 4 is a diagram illustrating a charging current limit value according to SOC (State of charge) in the DC power supply system 100.
  • FIG. 5 is a flowchart showing the control of the charging current limit value according to the SOC in DC power supply system 100.
  • a generated power sensor (not shown) is provided in the connection path between the output stage of the PV converter 2 and the HVDC bus 5, and the control unit 7 controls the solar cell 1. It is possible to detect the amount of generated power.
  • a power sensor (not shown) is provided in the connection path between the input / output stage of the bidirectional DC-DC converter 4 and the HVDC bus 5, and the controller 7 controls the discharge power amount of the lithium ion battery 3. It is possible to detect the amount of charged power and the SOC.
  • a power sensor (not shown) is provided in the connection path between the input stage of the DC load 6 and the HVDC bus 5, and the control unit 7 can detect the power consumption of the DC load. ing.
  • a power sensor (not shown) is provided in the connection path between the input / output stage of the bidirectional DC-AC converter 8 and the HVDC bus 5, and the amount of power supplied to the power system 10 by the control unit 7. In addition, the amount of power supplied from the power system 10 can be detected.
  • the AC load 11 connected between the bidirectional DC-AC converter 8 and the power system 10 is omitted because it is not connected in order to simplify the description.
  • Step 2 First, the steady state operation of the DC power supply system 100 will be described.
  • the control unit 7 compares the power generation amount of the solar cell 1 with the power consumption amount of the DC load 6 and determines that the power generation amount is lower than the power consumption amount, the control unit 7 generates the power generation power of the solar cell 1. Is supplied to the DC load 6, and power is supplied from the power system 10 to the DC load 6 as a shortage. Specifically, the control unit 7 brings the bidirectional DC-DC converter 4 into an inactive state and the bidirectional DC-AC converter 8 into an active state. Then, the control unit 7 controls the bidirectional DC-AC converter 8 so as to supply the insufficient power to the DC load 6.
  • the power generation amount of the solar cell 1 is 7 kW
  • the power consumption amount of the DC load 6 is 10 kW. Therefore, the control unit 7 supplies 7 kW, which is the power generation amount of the solar cell 1, to the DC load 6. Supply the shortage of 3 kW from the power system 10 side. In this case, charging of the lithium ion battery 3 and discharging from the lithium ion battery 3 are not performed.
  • the control unit 7 determines that the power generation amount exceeds the power consumption amount, and out of the power generation amount of the solar cell 1, the power corresponding to the power consumption amount of the DC load 6 is converted to DC. Supply to load 6. Further, the control unit 7 supplies surplus power to the lithium ion battery 3 to charge the lithium ion battery 3. Specifically, the control unit 7 sets the bidirectional DC-DC converter 4 to an active state and sets the bidirectional DC-AC converter 8 to an inactive state.
  • the power consumption of the DC load 6 is reduced to 5 kW from the case shown in FIG. 2, and the power generation amount of the solar cell 1 is 7 kW. It is judged that it is over.
  • the control unit 7 supplies 5 kW to the DC load 6 out of 7 kW of the generated power amount of the solar cell 1 and supplies 3 kW of surplus power to the lithium ion battery 3 via the bidirectional DC-DC converter 4. .
  • FIG. 4 is a diagram illustrating a charging current limit value according to the SOC in the DC power supply system 100.
  • FIG. 5 is a flowchart showing the control of the charging current limit value according to the SOC in DC power supply system 100.
  • control for changing the charging current limit value is performed in accordance with the SOC of the lithium ion battery 3.
  • the charge current limit value is also called a C (Capacity) rate, and represents a relative ratio of the charge current value to the capacity of the lithium ion battery 3.
  • the charge current limit value of 1 [C] refers to a current value at which a certain capacity cell is charged with a constant current and charging ends in one hour.
  • the charge of 1 [C] represents the charge with a charge current value of 40 A.
  • charging of 0.5 [C], 0.3 [C], and 0.1 [C] represents charging with charging current values of 20A, 12A, and 4A, respectively.
  • the charging current limit value is set to 1 [C].
  • the charging current limit values are set to 0.5 [C], 0.3 [C], and 0.1 [C], respectively.
  • the charging current limit value is set to 0 [C].
  • the charge amount when the SOC is 90% is set as the charge allowable upper limit value.
  • the charge current limit value is set to 0 [C] and the charge is stopped. ing.
  • the charge amount when the SOC is 75% is set as the charge set value, and the charge current value is set to the first value until the charge amount reaches a charge set value lower than the charge allowable upper limit value.
  • the first value is the charging current value when the charging current limit value is 1 [C].
  • the charge current value is set to the second value lower than the first value.
  • the second value is a charging current value when the charging current limit value is 0.5 [C], 0.3 [C], and 0.1 [C].
  • the control unit 7 first determines whether or not the charge amount of the lithium ion battery 3 has reached the charge setting value based on whether the SOC is 75% or more (S10). When the SOC is less than 75% (S10: NO), the control unit 7 sets the charging current limit value to 1 [C] (S11). That is, the control unit 7 sets the charging current limit value to 1 so that the charging current value does not exceed the first value until the SOC reaches 75% of the charging setting value lower than 90% of the allowable charging upper limit value. Set to [C] to charge.
  • the control unit 7 sets the charging current limit value to 0.5 [C]. (S17).
  • the control unit 7 sets the charging current limit value to 0.3 [C] ( S16).
  • the control unit 7 sets the charging current limit value to 0.1 [C] (S14).
  • the control unit 7 sets the charge current limit value to 0. 0 so that the charge current value becomes the second value lower than the first value. Charging is performed by setting 5 [C], 0.3 [C], or 0.1 [C].
  • control unit 7 sets the charging current limit value to 0 [C] and stops charging (S18).
  • the charge amount of the lithium ion battery 3 exceeds 75% of the charge setting value, the charge amount does not immediately reach 90% of the charge allowable upper limit value.
  • the charging current value is set lower than the charging current value when the charging amount is less than 75% of the charging set value.
  • the charging current value is gradually reduced as the charging amount approaches 90% of the allowable charging upper limit value. Therefore, even if the SOC of the lithium ion battery 3 exceeds 75%, the charging current value is fully satisfied. The period until charging can be extended.
  • the first value and the second value are values that depend on the charge / discharge characteristics of the lithium ion battery and the battery capacity, and some of the lithium ion batteries in practical use can be charged at about 10 C. The values are not limited to those shown in this embodiment, and can be set as appropriate.
  • FIG. 6 is a flowchart showing the control of the charging current limit value according to the SOC in the DC power supply system 100 according to the second embodiment.
  • the control until the amount of charge reaches 90% of the allowable charging upper limit is the same as the control in the first embodiment shown in FIG.
  • the control unit 7 in the present embodiment determines that the charge amount has reached 90% of the charge allowable upper limit value (S12: YES)
  • the voltage value of the HVDC bus 5 increases beyond the threshold value. It is determined whether or not (S20). Whether or not the voltage value of the HVDC bus 5 has exceeded the threshold value is detected by, for example, providing a voltage detection circuit for monitoring the HVDC bus voltage using a voltage dividing resistor or the like, and comparing it with the threshold value. Judgment is possible.
  • control unit 7 determines whether or not the voltage increase of the HVDC bus 5 has continued for a predetermined time or more, that is, whether or not the voltage increase has stopped within a predetermined time (S22). If the voltage rise is transient (the voltage rise has stopped within a predetermined time) (S22: NO), permission of charging is continued.
  • the charging current limit value is set to 0 [C] (S23), and control is performed so that no current flows to the lithium ion battery 3.
  • The” predetermined time in this case is in milliseconds, for example within 1 second. Assuming that the charging capacity of the lithium ion battery 3 is 40 Ah, even if it is charged at 10 C, the capacity is only affected by about 0.1 Ah in 1 second, which is an increase of about 0.25% when converted to SOC. Therefore, the life of the lithium ion battery is not substantially affected.
  • the voltage value of the HVDC bus 5 has risen transiently beyond the threshold value.
  • the current is allowed to flow to the lithium ion battery 3. Therefore, even when the DC load 6 suddenly changes to a light load and the power consumption decreases transiently, it is possible to prevent the system from stopping and provide a DC power supply system that is easy to continue operation.
  • the present invention can be used for a DC power supply system in which a solar battery and a storage battery are combined.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Afin de fournir un système d'alimentation en CC capable d'empêcher un arrêt d'un système même lorsque la consommation d'énergie d'une charge CC baisse brutalement, le système d'alimentation en CC selon l'invention comprend : une ligne de bus CC 5 à laquelle peut être branchée une charge CC 6 ; un dispositif de génération d'énergie 1 pour fournir de l'énergie à la ligne de bus CC 5 ; une batterie secondaire 3 capable de fournir de l'énergie à la ligne de bus CC 5 ; et une unité de commande 7 pour commander la charge et la décharge de la batterie secondaire 3. L'unité de commande 7 réalise une commande de sorte qu'une valeur de courant de charge n'excède pas une première valeur jusqu'à ce que la quantité de charge de la batterie secondaire 3 atteigne une valeur de charge réglée prédéterminée qui est inférieure à une valeur de charge limite supérieure admissible prédéterminée, et réalise une commande de sorte que la valeur du courant de charge est réglée à une seconde valeur inférieure à la première valeur lorsque la quantité de charge excède la valeur de charge réglée.
PCT/JP2018/006016 2017-02-22 2018-02-20 Système d'alimentation en cc WO2018155442A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880005829.7A CN110140273A (zh) 2017-02-22 2018-02-20 直流供电系统
JP2019501345A JP6795082B2 (ja) 2017-02-22 2018-02-20 直流給電システム

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JP2017-030917 2017-02-22
JP2017030917 2017-02-22

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WO2018155442A1 true WO2018155442A1 (fr) 2018-08-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021039678A1 (fr) * 2019-08-23 2021-03-04 シオン電機株式会社 Dispositif d'alimentation électrique en courant continu

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Publication number Priority date Publication date Assignee Title
JP2003223936A (ja) * 2002-01-30 2003-08-08 Daikin Ind Ltd 充電方法、蓄電池システム、空気調和システム
WO2012049965A1 (fr) * 2010-10-15 2012-04-19 三洋電機株式会社 Système de gestion d'énergie
JP2013042627A (ja) * 2011-08-18 2013-02-28 Ntt Docomo Inc 直流電源制御装置および直流電源制御方法
US20160241041A1 (en) * 2013-09-30 2016-08-18 Acciona Energía, S.A. Method for controlling power fluctuation ramps having energy storage systems in plants for intermittent energy generation

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JP2010041883A (ja) * 2008-08-07 2010-02-18 Panasonic Corp 蓄電システム
JP5741153B2 (ja) * 2011-04-06 2015-07-01 トヨタ自動車株式会社 充電制御装置
CN103475051A (zh) * 2013-09-02 2013-12-25 四川川奇机电有限责任公司 充电电路和具有该充电电路的充电器以及充电方法
CN203645351U (zh) * 2013-09-02 2014-06-11 四川川奇机电有限责任公司 充电电路和具有该充电电路的充电器

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2003223936A (ja) * 2002-01-30 2003-08-08 Daikin Ind Ltd 充電方法、蓄電池システム、空気調和システム
WO2012049965A1 (fr) * 2010-10-15 2012-04-19 三洋電機株式会社 Système de gestion d'énergie
JP2013042627A (ja) * 2011-08-18 2013-02-28 Ntt Docomo Inc 直流電源制御装置および直流電源制御方法
US20160241041A1 (en) * 2013-09-30 2016-08-18 Acciona Energía, S.A. Method for controlling power fluctuation ramps having energy storage systems in plants for intermittent energy generation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021039678A1 (fr) * 2019-08-23 2021-03-04 シオン電機株式会社 Dispositif d'alimentation électrique en courant continu

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CN110140273A (zh) 2019-08-16
JPWO2018155442A1 (ja) 2019-11-07
JP6795082B2 (ja) 2020-12-02

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