WO2020161766A1 - Système d'alimentation en courant continu - Google Patents

Système d'alimentation en courant continu Download PDF

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Publication number
WO2020161766A1
WO2020161766A1 PCT/JP2019/003849 JP2019003849W WO2020161766A1 WO 2020161766 A1 WO2020161766 A1 WO 2020161766A1 JP 2019003849 W JP2019003849 W JP 2019003849W WO 2020161766 A1 WO2020161766 A1 WO 2020161766A1
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WO
WIPO (PCT)
Prior art keywords
power
bidirectional
storage batteries
converters
bus
Prior art date
Application number
PCT/JP2019/003849
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English (en)
Japanese (ja)
Inventor
琢真 光永
Original Assignee
Tdk株式会社
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 Tdk株式会社 filed Critical Tdk株式会社
Priority to PCT/JP2019/003849 priority Critical patent/WO2020161766A1/fr
Publication of WO2020161766A1 publication Critical patent/WO2020161766A1/fr

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    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a DC power supply system, and particularly to a DC power supply system configured by combining a natural energy power generation device such as a solar power generation device and a plurality of storage batteries.
  • the demand forecast data of load devices and the power generation output forecast data of a natural energy power generation device are calculated using weather forecast data, and the maximum of the storage battery is calculated based on the demand forecast data and the power generation output data.
  • the power output from the renewable energy power generation device is suppressed, and when it is predicted that the storage battery will be discharged in excess of the maximum discharge power of the storage battery. Describes a method of suppressing the power consumption of the adjustment load.
  • Patent Document 2 a plurality of storage batteries are charged after the power generated by the solar power generation device is temporarily stored in an electric double layer capacitor, and at least one of the plurality of storage batteries to be charged reaches a full charge.
  • a method is described in which all storage batteries are charged by removing them from the charging target and sequentially selecting and charging other storage batteries that are not the charging target.
  • an object of the present invention is to provide a DC power supply system capable of suppressing variations in charging rates of a plurality of storage batteries connected to a DC bus and preventing a decrease in charge/discharge capacity of the entire storage battery.
  • a DC power supply system includes a DC bus that is a bus for DC power supply, a natural energy power generation device that supplies generated power to the DC bus, and a load power supply from the DC bus.
  • a load device a plurality of bidirectional DC/DC converters connected to the DC bus, and a plurality of storage batteries respectively connected to the DC bus via any one of the plurality of bidirectional DC/DC converters
  • a power management device that manages the operations of the plurality of bidirectional DC/DC converters based on the generated power, the load power, and the charging rates of the plurality of storage batteries. It is characterized in that the output voltage of the bidirectional DC/DC converter corresponding to each storage battery is controlled according to the charging rate.
  • the present invention it is possible to prevent variations in the charging rates of a plurality of storage batteries that are supplied with generated power from a natural energy power generation device via a DC bus, and prevent a decrease in the charge/discharge capacity of the entire storage battery.
  • the plurality of bidirectional DC/DC converters include first and second DC/DC converters, and the plurality of storage batteries are respectively connected to the first and second DC/DC converters.
  • the power management apparatus includes first and second storage batteries, and when the charging rates of all the storage batteries including the first and second storage batteries are equal to or less than a first threshold value, the power management device includes the first and second storage batteries. Output voltages of all the bidirectional DC/DC converters including the bidirectional DC/DC converter are set to a first voltage, and a charging rate of at least the first storage battery is larger than the first threshold value, and at least the first threshold value is set.
  • the charging rate of the second storage battery is less than or equal to the first threshold value
  • the first threshold value is 80% or more and 95% or less of the maximum capacity of the first and second storage batteries. In this way, when at least one of the plurality of storage batteries approaches the full charge in advance, the storage battery is not fully charged, and the other storage batteries that are not close to the full charge are given priority. Therefore, the generated power can be efficiently charged. Therefore, the charging rates of a plurality of storage batteries can be equalized, and a decrease in the charging ability of the entire storage batteries can be prevented.
  • the power management device may be configured such that when the charging rates of all storage batteries including the first and second storage batteries are equal to or higher than a second threshold value that is smaller than the first threshold value, the first and second bidirectional operations are performed. Output voltages of all bidirectional DC/DC converters including DC/DC converters are set to the first voltage, and a charging rate of at least the first storage battery is smaller than the second threshold value, and at least the second threshold value. It is preferable that the output voltage of the first bidirectional DC/DC converter is set to a third voltage lower than the first voltage when the charging rate of the storage battery is equal to or higher than the second threshold value.
  • the second threshold value is preferably 5% or more and 20% or less of the maximum capacities of the first and second storage batteries.
  • the first voltage is a reference voltage of the DC bus.
  • the reference voltage of the DC bus is 350V
  • the first voltage is set to 350V
  • the second voltage is set to 370V
  • the third voltage is set to 330V, so that the charging rates of the plurality of storage batteries are equalized. Therefore, it is possible to prevent a decrease in the charging capacity of the entire storage battery.
  • FIG. 1 is a block diagram schematically showing a configuration of a DC power supply system according to an embodiment of the present invention.
  • 2A and 2B are diagrams for explaining the operation of the DC power supply system, in which FIG. 2A shows the charging operation of the storage battery and FIG. 2B shows the discharging operation of the storage battery.
  • FIG. 3 is a schematic diagram for explaining control of the bidirectional DC/DC converter by the power management device, showing a case where the charging rates of the storage batteries 50A to 50C are not more than the second threshold and not less than the first threshold.
  • FIG. 4 is a schematic diagram illustrating a control method of the bidirectional DC/DC converter by the power management device, and illustrates a case where the charging rate of the storage battery 50A is larger than the first threshold value.
  • FIG. 5 is a schematic diagram illustrating a control method of the bidirectional DC/DC converter by the power management device, and illustrates a case where the charging rates of the storage batteries 50A and 50B are larger than the first threshold value.
  • FIG. 6 is a schematic diagram for explaining the control method of the bidirectional DC/DC converter by the power management device, and shows the case where the charging rates of the storage batteries 50A, 50B, 50C are larger than the first threshold value.
  • FIG. 7 is a schematic diagram illustrating a control method of the bidirectional DC/DC converter by the power management device, and illustrates a case where the charging rate of the storage battery 50A is smaller than the second threshold value.
  • FIG. 1 is a block diagram schematically showing the configuration of a DC power supply system according to an embodiment of the present invention.
  • the DC power supply system 1 includes a DC bus 10 serving as a bus for DC power supply, DC/DC converters 21 to 23 connected to the DC bus 10, and a DC bus via the DC/DC converter 21.
  • a natural energy power generation device 30 connected to the DC power supply device 10, a load device 40 connected to the DC bus 10 via the DC/DC converter 22, and a storage battery 50 connected to the DC bus 10 via the DC/DC converter 23.
  • the power management apparatus 60 that manages the entire system including the operations of the DC/DC converters 21 to 23 and the power management apparatus 60 that can communicate with the power management apparatus 60 via a communication network 70 such as the Internet so that the storage battery 50 is discharged. Further, the administrator terminal 71 is further provided.
  • the voltage of the DC bus 10 is, for example, a high voltage DC transmission line of 350 ⁇ 100V. Therefore, when connecting a device operating at a voltage lower than that to the DC bus 10, it is necessary to connect via a DC/DC converter.
  • the DC/DC converter 21 is a one-way DC/DC converter (step-up converter) that boosts the generated power of, for example, 240 V from the natural energy power generation device 30 to 350 V and supplies the boosted power to the DC bus 10
  • the DC/DC converter 22 is Is a one-way DC/DC converter (step-down converter) that steps down the electric power of 350 V on the DC bus 10 to 24 V and supplies it to the load device 40.
  • the DC/DC converter 23 is a bidirectional DC/DC converter that steps down or boosts the power on the DC bus 10 and supplies it to the storage battery 50, and boosts or steps down the power from the storage battery 50 and supplies it to the DC bus 10. is there.
  • the DC/DC converters 21 to 23 have an ON/OFF command receiving function and a power amount adjustment command receiving function, and are configured to be communicable with the power management device 60.
  • the natural energy power generation device 30 is, for example, a solar power generation device 30A or a wind power generation device 30B.
  • the photovoltaic power generation device 30A includes a photovoltaic power generation panel and a power conditioner, and is connected to the DC bus 10 via the DC/DC converter 21A.
  • the wind turbine generator 30B includes a wind turbine generator body and a power conditioner, and is connected to the DC bus 10 via a DC/DC converter 21B.
  • the DC/DC converters 21A and 21B may be built in each power conditioner.
  • the power conditioner has an MPPT (Maximum Power Point Tracking) function, an ON/OFF command receiving function, a power amount adjustment command receiving function, a power generation information transmitting function, and the like, and is configured to communicate with the power management device 60. ..
  • the type and number of the natural energy power generation devices 30 connected to the DC bus 10 are not particularly limited, but it is preferable to include the solar power generation device 30A.
  • the electric power generated by the solar power generation device 30A and the wind power generation device 30B is supplied to the load device 40 and the storage battery 50 via the DC bus 10.
  • the load device 40 is, for example, a PC, an air conditioner, a TV, an LED lighting, or the like. These load devices 40A to 40D are connected to the DC bus 10 via the DC/DC converters 22A to 22D, respectively, and receive power from the DC bus 10.
  • the storage battery 50 includes a plurality of storage batteries 50A to 50C, and each storage battery 50A to 50C includes a storage battery main body (battery cell) and a BMU (Battery Management Unit) for monitoring and controlling the charging state.
  • the storage batteries 50A to 50C are connected to the DC bus 10 via the bidirectional DC/DC converters 23A to 23C, respectively, and the power generated by the natural energy power generation device 30 is less than the power consumed by the load device 40 (load power).
  • load power When the load power is larger than the generated power, the excess power of the generated power is charged, and when the load power is larger than the generated power, the excess power is discharged to supplement the shortage of the load power.
  • the storage batteries 50A to 50C have substantially the same maximum capacity and charge/discharge performance.
  • the BMU of the storage battery 50 has an ON/OFF command receiving function, a DC bus voltage adjustment command receiving function, a charging/discharging current amount adjustment command receiving function, a storage battery information transmitting function, etc., and is configured to communicate with the power management device 60. Has been done.
  • the SOC State Of Charge: remaining capacity (Ah)/full charge capacity (Ah) ⁇ 100) indicating the charging rates of the storage batteries 50A to 50C is appropriately notified to the power management apparatus 60.
  • the DC power supply system 1 may further include a diesel generator 35.
  • the amount of generated power can be forcibly increased by operating the diesel generator 35 when the amount of power generated by the natural energy power generation device 30 is small or when the remaining amount of the storage battery 50 is small. Therefore, it is possible to suppress load power and avoid power failure, and it is possible to stably supply power to the load device 40.
  • the diesel generator 35 can be used as a power source when starting up the entire system including the DC bus 10. Since the diesel generator 35 generally has an AC output, the diesel generator 35 is connected to the DC bus 10 via the AC/DC converter 24.
  • the power management device 60 is a computer system equipped with an EMS (Energy Management System).
  • the power management device 60 can remotely control the input/output operations of the DC/DC converters 21 to 23, and can control the power generation amount of the natural energy power generation device 30 and the power demand of the load device 40.
  • the power management device 60 commands the natural energy power generation device 30, the load device 40, and the storage battery 50, and collects information from these devices.
  • the collection of commands and information to these devices is performed using a communication method such as RS-232C, RS-485, CAN (Controller Area Network), Ethernet, Wi-Fi.
  • FIG. 2A and 2B are diagrams for explaining the operation of the DC power supply system 1, where FIG. 2A shows the charging operation of the storage battery 50 and FIG. 2B shows the discharging operation of the storage battery 50. There is.
  • the storage battery 50 charges the surplus of the generated power amount.
  • the generated power from the natural energy power generation device 30 is supplied to the storage battery 50 via the DC/DC converter 21, the DC bus 10, and the DC/DC converter 22.
  • the storage battery 50 is discharged to supply the necessary power to the load device 40. Electric power from the storage battery 50 is supplied to the load device 40 via the DC/DC converter 23, the DC bus 10 and the DC/DC converter 22.
  • 3 to 7 are schematic diagrams illustrating a method of controlling the bidirectional DC/DC converters 23A to 23C by the power management device 60.
  • the SOC of each of the storage batteries 50A to 50C is less than or equal to the upper threshold (first threshold) SOC TH set near the maximum capacity (100%), and set near 0%.
  • the power management apparatus 60 sets the output voltage (grid target voltage) of the DC/DC converters 23A to 23C to the DC bus 10 to 350V which is the reference voltage of the DC bus 10. It is maintained at (first voltage).
  • the first threshold SOC TH is preferably set to 80% or more and 95% or less of the maximum capacity of the storage batteries 50A to 50C
  • the second threshold SOC TL is 5% or more of the maximum capacity of the storage batteries 50A to 50C. It is preferable to set it to be not more than %.
  • the generated power is supplied from the natural energy power generation device 30 to the DC bus 10 and the voltage of the DC bus 10 is When trying to exceed 350 V, current flows from the DC bus 10 toward the storage batteries 50A to 50C, and the storage batteries 50A to 50C are charged.
  • a current flows from the storage batteries 50A to 50C toward the DC bus 10 and the storage batteries 50A to 50C are discharged. ..
  • FIG. 3 shows a state in which the charging rates of the storage batteries 50A to 50C have some variations.
  • the power management device 60 changes the output voltage of the bidirectional DC/DC converter 23A connected to the storage battery 50A to another value. It is set higher than the output voltage of the two bidirectional DC/DC converters 23B and 23C.
  • the output voltage of the bidirectional DC/DC converter 23A is set to 370V (second voltage), and the output voltages of the other bidirectional DC/DC converters 23B and 23C are maintained at 350V (first voltage). ..
  • the storage battery 50A is less likely to be charged than the other storage batteries 50B and 50C, and it is possible to prevent the storage battery 50A from being fully charged, and all the storage batteries 50A to 50C can be charged and discharged. It is possible to maintain a good state. Therefore, it is possible to prevent waste of the generated power of the natural energy power generation device due to loss reduction. Further, it is possible to prevent the system from going down by suppressing the voltage fluctuation of the DC bus 10.
  • the power management device 60 sets the output voltage of the bidirectional DC/DC converters 23A and 23B connected to the storage batteries 50A and 50B to the other one. It is set higher than the output voltage of the DC/DC converter 23C.
  • the output voltage of the bidirectional DC/DC converters 23A and 23B is set to 370V, and the output voltage of the bidirectional DC/DC converter 23C is maintained at 350V.
  • the storage batteries 50A and 50B are less likely to be charged than the other storage batteries 50C, and it is possible to prevent the storage batteries 50A and 50B from being fully charged, and all the storage batteries 50A to 50C are charged. The dischargeable state can be maintained.
  • the output voltages of all the bidirectional DC/DC converters 23A to 23C are lower than the reference voltage of the DC bus.
  • a high voltage for example, 370V
  • the output voltages of all the bidirectional DC/DC converters 23A to 23C may be returned to the reference voltage (350V) of the DC bus 10.
  • the power management apparatus 60 stop the power generation operation of the natural energy power generation apparatus 30.
  • the power management device 60 changes the output voltage of the bidirectional DC/DC converter 23A connected to the storage battery 50A to another value. It is set lower than the output voltage of the two bidirectional DC/DC converters 23B and 23C.
  • the output voltage of the bidirectional DC/DC converter 23A is set to 330V (third voltage), and the output voltages of the other two bidirectional DC/DC converters 23B and 23C are maintained at 350V (first voltage). To be done.
  • the DC power supply system 1 includes the plurality of storage batteries 50A to 50C connected to the DC bus 10 via the bidirectional DC/DC converters 23A to 23C and the bidirectional DC/DC converter 23A.
  • Power management device 60 for controlling the operations of the storage batteries 50A to 23C. Since the output voltage is changed, it is possible not only to suppress the variation in the charging rate between the storage batteries 50A to 50C and prevent the charging/discharging ability of the entire storage battery 50 from decreasing, but also to stabilize the DC bus 10.
  • the number of storage batteries may be any number as long as it is two or more (a plurality).
  • the output voltage of the DC/DC converter is changed in two steps (350 V ⁇ 370 V) based on one SOC threshold value.
  • the DC/DC converter output voltage is changed by using two or more SOC threshold values. It is also possible to change the output voltage in multiple stages (for example, 350V ⁇ 360V ⁇ 370V).

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention permet de supprimer la variation des régimes de charge d'une pluralité de batteries de stockage raccordées à un bus à courant continu, de sorte à empêcher une réduction de la capacité de charge/décharge des batteries de stockage dans leur ensemble. L'invention concerne en particulier un système d'alimentation électrique à courant continu (1) comprenant : un bus à courant continu (10) servant de bus à une alimentation en courant continu ; un dispositif de génération d'alimentation à énergie naturelle (30) destiné à acheminer l'alimentation générée vers le bus à courant continu (10) ; un dispositif de charge (40) destiné à recevoir l'alimentation provenant du bus à courant continu (10) ; une pluralité de convertisseurs CC/CC bidirectionnels raccordés au bus à courant continu ; une pluralité de batteries rechargeables (50A-50C) raccordées individuellement au bus de courant continu (10) par l'intermédiaire d'un des convertisseurs CC/CC bidirectionnels (23A-23C) ; et un dispositif de gestion d'alimentation (60) destiné à gérer le fonctionnement de la pluralité de convertisseurs CC/CC bidirectionnels (23A-23C) en fonction de l'alimentation générée, de la puissance de charge et des régimes de charge de la pluralité de batteries rechargeables. Le dispositif de gestion d'alimentation (60) régule les tensions de sortie des convertisseurs CC/CC bidirectionnels (23A-23C) correspondant à chaque batterie rechargeable, en fonction du régime de charge de chaque batterie rechargeable.
PCT/JP2019/003849 2019-02-04 2019-02-04 Système d'alimentation en courant continu WO2020161766A1 (fr)

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PCT/JP2019/003849 WO2020161766A1 (fr) 2019-02-04 2019-02-04 Système d'alimentation en courant continu

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PCT/JP2019/003849 WO2020161766A1 (fr) 2019-02-04 2019-02-04 Système d'alimentation en courant continu

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023162921A1 (fr) * 2022-02-25 2023-08-31 本田技研工業株式会社 Dispositif d'alimentation électrique, procédé de commande de dispositif d'alimentation électrique, programme et support de stockage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015220889A (ja) * 2014-05-19 2015-12-07 シャープ株式会社 電力供給システム
US20170093187A1 (en) * 2015-09-24 2017-03-30 Samsung Sdi Co., Ltd. Energy storage system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015220889A (ja) * 2014-05-19 2015-12-07 シャープ株式会社 電力供給システム
US20170093187A1 (en) * 2015-09-24 2017-03-30 Samsung Sdi Co., Ltd. Energy storage system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023162921A1 (fr) * 2022-02-25 2023-08-31 本田技研工業株式会社 Dispositif d'alimentation électrique, procédé de commande de dispositif d'alimentation électrique, programme et support de stockage

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