WO2021192108A1 - Dispositif de gestion d'énergie, système d'alimentation en énergie et procédé de gestion d'énergie - Google Patents

Dispositif de gestion d'énergie, système d'alimentation en énergie et procédé de gestion d'énergie Download PDF

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Publication number
WO2021192108A1
WO2021192108A1 PCT/JP2020/013413 JP2020013413W WO2021192108A1 WO 2021192108 A1 WO2021192108 A1 WO 2021192108A1 JP 2020013413 W JP2020013413 W JP 2020013413W WO 2021192108 A1 WO2021192108 A1 WO 2021192108A1
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WIPO (PCT)
Prior art keywords
power
storage
power supply
power generation
amount
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PCT/JP2020/013413
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English (en)
Japanese (ja)
Inventor
久和 宇都
鈴木　真吾
克夫 直井
雅雄 一
琢真 光永
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Tdk株式会社
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Priority to JP2022510228A priority Critical patent/JP7367852B2/ja
Priority to PCT/JP2020/013413 priority patent/WO2021192108A1/fr
Publication of WO2021192108A1 publication Critical patent/WO2021192108A1/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
    • 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
    • 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 disclosure relates to a power management device, a power supply system, and a power management method.
  • auxiliary power supply In order to operate the auxiliary power supply, for example, fuel and commercial power are required, so there is a risk that a great deal of cost will be incurred.
  • power cannot be supplied to the power supply system due to a power outage in an area where the power system is unstable. Therefore, it is desired to shorten the operating time of the auxiliary power supply device.
  • This disclosure describes a power management device, a power supply system, and a power management method that can shorten the operating time of the auxiliary power supply device.
  • the power management device includes a first acquisition unit that acquires the remaining battery level of a storage battery connected to a DC bus via a converter, and a power generation device included in a power supply device that supplies power to the DC bus. It is provided with a second acquisition unit that acquires the amount of power generated in the above, and a control unit that controls the start or stop of the auxiliary power supply device that supplies electric power to the DC bus based on the remaining battery level and the amount of power generation.
  • the start or stop of the auxiliary power supply device is controlled in consideration of not only the remaining battery level of the storage battery but also the amount of power generated by the power generation device. For example, even if the remaining battery level of the storage battery is reduced, it is possible not to start the auxiliary power supply device if a sufficient amount of power generation can be obtained. In a situation where the auxiliary power supply device is operating, even if the storage battery does not have a sufficient battery level, the auxiliary power supply device can be stopped if a sufficient amount of power generation can be obtained. As a result, the operating time of the auxiliary power supply device can be shortened.
  • the control unit may activate the auxiliary power supply device when the remaining battery level is smaller than the first storage threshold value and the amount of power generation is smaller than the first power generation threshold value.
  • the auxiliary power supply device is not activated when a certain amount of power generation can be obtained. Therefore, the timing of starting the auxiliary power supply device can be delayed. As a result, the operating time of the auxiliary power supply device can be shortened.
  • the control unit may start the auxiliary power supply device.
  • the auxiliary power supply device may be activated regardless of the amount of power generation.
  • the second storage threshold may be smaller than the first storage threshold.
  • the control unit may stop the auxiliary power supply device.
  • the auxiliary power supply device may be stopped regardless of the amount of power generation.
  • the fourth storage threshold value may be larger than the third storage storage threshold value.
  • the power generation device may be a renewable energy power generation device. In this case, since renewable energy is used, it is possible to reduce the cost.
  • the power supply system includes a DC bus for supplying DC power, a power supply device that includes a power generation device and supplies power to the DC bus, and an auxiliary power supply device that supplies power to the DC bus.
  • the first converter which is connected to the DC bus and converts the bus voltage supplied to the DC bus into the load voltage supplied to the load equipment, is provided between the storage battery, the storage battery and the DC bus, and the bus voltage and the storage battery. It is provided with a second converter capable of bidirectionally converting the battery voltage of the above battery, and a power management device for charging and discharging the storage battery by controlling the second converter.
  • the power management device controls the start or stop of the auxiliary power supply device based on the remaining battery level of the storage battery and the amount of power generated by the power generation device.
  • the start or stop of the auxiliary power supply device is controlled in consideration of not only the remaining battery level of the storage battery but also the amount of power generated by the power generation device. For example, even if the remaining battery level of the storage battery is reduced, it is possible not to start the auxiliary power supply device if a sufficient amount of power generation can be obtained. In a situation where the auxiliary power supply device is operating, even if the storage battery does not have a sufficient battery level, the auxiliary power supply device can be stopped if a sufficient amount of power generation can be obtained. As a result, the operating time of the auxiliary power supply device can be shortened.
  • a power management method is a step of acquiring the remaining battery level of a storage battery connected to a DC bus via a converter, and a power generation device included in a power supply device that supplies power to the DC bus. It includes a step of acquiring the amount of power generation and a step of controlling the start or stop of the auxiliary power supply device that supplies power to the DC bus based on the remaining battery level and the amount of power generation.
  • the start or stop of the auxiliary power supply device is controlled in consideration of not only the remaining battery level of the storage battery but also the amount of power generated by the power generation device. For example, even if the remaining battery level of the storage battery is reduced, it is possible not to start the auxiliary power supply device if a sufficient amount of power generation can be obtained. In a situation where the auxiliary power supply device is operating, even if the storage battery does not have a sufficient battery level, the auxiliary power supply device can be stopped if a sufficient amount of power generation can be obtained. As a result, the operating time of the auxiliary power supply device can be shortened.
  • the operating time of the auxiliary power supply device can be shortened.
  • FIG. 1 is a configuration diagram schematically showing a power supply system according to an embodiment.
  • FIG. 2 is a hardware configuration diagram of the power management device shown in FIG.
  • FIG. 3 is a functional block diagram of the power management device shown in FIG.
  • FIG. 4 is a diagram showing the relationship between the threshold values.
  • FIG. 5 is a flowchart showing a series of processes of start control performed by the power management device shown in FIG.
  • FIG. 6 is a flowchart showing a series of stop control processes performed by the power management device shown in FIG.
  • FIG. 7 is a diagram for explaining the operating time of the auxiliary power supply device when start control and stop control are performed by the power management device shown in FIG.
  • FIG. 8 is a diagram for explaining the operating time of the auxiliary power supply device when start control and stop control are performed by the power management device of the comparative example.
  • FIG. 1 is a configuration diagram schematically showing a power supply system according to an embodiment.
  • the power supply system 1 shown in FIG. 1 is a system that supplies load power WL (load voltage VL) to load device L.
  • the power supply system 1 is a DC power supply system.
  • the load device L may be a DC load device that operates at a DC voltage, or may be an AC load device that operates at an AC voltage. Examples of direct current load devices include LED (Light Emission Diode) illuminators, DC (Direct Current) fans, and personal computers. Examples of AC load equipment include washing machines, refrigerators, and air conditioners.
  • the power supply system 1 includes a DC bus 2, one or more power supply devices 3, an auxiliary power supply device 5, one or more converters 6 (first converter), one or more power storage devices 7, and a power management device. 10 and.
  • the DC bus 2 is a bus that functions as a bus for supplying DC power to supply DC power.
  • the DC bus 2 is laid over the installation locations of the power supply device 3, the auxiliary power supply device 5, the power storage device 7, and the load device L.
  • the bus voltage Vbus is supplied to the DC bus 2.
  • the bus voltage Vbus is a high voltage DC voltage.
  • the bus voltage Vbus is set to be within the range of the input voltage of the converter 6.
  • the bus voltage Vbus is, for example, a voltage of DC250V or more and DC450V or less.
  • the voltage value of the bus voltage Vbus may be fixed or may vary.
  • the power supply device 3 is a device that supplies electric power to the DC bus 2.
  • the power supply system 1 includes one power supply device 3.
  • the number of power supply devices 3 is not limited to one, and may be changed as needed.
  • the power supply device 3 includes a renewable energy power generation device 31 (power generation device) and a power conditioner 32.
  • the renewable energy power generation device 31 is a device that generates generated power Wre.
  • Examples of the renewable energy power generation device 31 include a solar power generation device, a wind power generation device, a hydroelectric power generation device, and a geothermal power generation device.
  • the renewable energy power generation device 31 is connected to the DC bus 2 via the power conditioner 32.
  • the renewable energy power generation device 31 generates a power generation voltage Vre having a predetermined voltage value, and outputs a power generation power Wre corresponding to the power generation voltage Vre.
  • the generated voltage Vre may be a DC voltage or an AC voltage.
  • the power conditioner 32 is a device that is connected to the DC bus 2 and converts the generated voltage Vre into the bus voltage Vbus.
  • the power conditioner 32 includes a DC / DC converter.
  • the power conditioner 32 includes an AC (Alternating Current) / DC converter.
  • the power conditioner 32 operates with a DC voltage generated internally based on, for example, the generated voltage Vre.
  • the power conditioner 32 controls the generated power Wre by controlling the power generation operation of the renewable energy power generation device 31 based on the command from the power management device 10.
  • the power conditioner 32 converts the generated voltage Vre into the bus voltage Vbus and supplies the bus voltage Vbus to the DC bus 2 based on the command from the power management device 10.
  • the power conditioner 32 has a power measurement function for measuring the generated power Wre supplied from the renewable energy power generation device 31 to the DC bus 2.
  • the power conditioner 32 for example, periodically measures the generated power Wre.
  • the power conditioner 32 transmits the measured value of the generated power Wre to the power management device 10.
  • the auxiliary power supply device 5 is a device that supplies electric power to the DC bus 2.
  • the auxiliary power supply device 5 includes a commercial power supply 51 and an AC / DC converter 52.
  • the commercial power supply 51 supplies system power Ws including system voltage Vs having a predetermined voltage value.
  • the system voltage Vs is an AC voltage.
  • the commercial power supply 51 is connected to the DC bus 2 via an AC / DC converter 52.
  • the AC / DC converter 52 is a device that is connected to the DC bus 2 and converts the system voltage Vs into the bus voltage Vbus.
  • the system voltage Vs is an AC voltage.
  • the AC / DC converter 52 operates, for example, with a DC voltage generated internally based on the system voltage Vs.
  • the AC / DC converter 52 converts the system voltage Vs into the bus voltage Vbus and supplies the bus voltage Vbus to the DC bus 2 based on the command from the power management device 10.
  • the AC / DC converter 52 has a power measurement function for measuring the system power Ws supplied from the commercial power supply 51 to the DC bus 2.
  • the AC / DC converter 52 periodically measures the system power Ws, for example.
  • the AC / DC converter 52 transmits the measured value of the system power Ws to the power management device 10.
  • the auxiliary power supply device 5 can stably supply electric power, it is controlled to supply electric power when the electric power of the entire power supply system 1 is insufficient.
  • the system power Ws is equal to or greater than the sum of the total load power WL and the standby power in the power supply system 1.
  • the standby power includes the power consumption of the power management device 10 and the power consumption of auxiliary equipment (relays, fans, small-capacity power supplies, etc. (not shown)).
  • the converter 6 is connected to the DC bus 2 and is a device that converts the bus voltage Vbus into the load voltage VL.
  • the load voltage VL is a voltage supplied to the load device L.
  • the load device L is connected to the DC bus 2 via the converter 6.
  • the converter 6 operates with a DC voltage generated internally based on, for example, the bus voltage Vbus.
  • the power supply system 1 includes four converters 6.
  • the number of converters 6 is not limited to four, and may be changed according to the number of load devices L.
  • the converter 6 When the converter 6 receives the start command from the power management device 10, the converter 6 converts the bus voltage Vbus into the load voltage VL and supplies the load voltage VL (load power WL) to the load device L.
  • the load device L When the load device L is a DC load device, the load voltage VL is a DC voltage, and the converter 6 is a DC / DC converter.
  • the load device L When the load device L is an AC load device, the load voltage VL is an AC voltage, and the converter 6 is a DC / AC converter.
  • the converter 6 receives the stop command from the power management device 10, the converter 6 stops the supply of the load voltage VL.
  • the converter 6 has a current limiting function that limits the load current supplied from the DC bus 2 to the load device L by an upper limit current value.
  • the upper limit current value is set by the power management device 10.
  • the converter 6 has a power measurement function for measuring the load power WL supplied from the DC bus 2 to the load device L based on the load voltage VL and the load current. The converter 6 periodically measures the load power WL, for example. The converter 6 transmits the measured value of the load power WL to the power management device 10.
  • the power storage device 7 is a device for accumulating the surplus power generated in the power supply system 1 and supplying the insufficient power generated in the power supply system 1.
  • surplus power equal to the magnitude (power value) of the differential power is generated.
  • the supplied electric power is the electric power supplied to the DC bus 2.
  • the supplied power is the generated power Wre and the system power Ws.
  • Power Wc obtained by evenly dividing the surplus power by the number of power storage devices 7 is supplied to each power storage device 7 from the DC bus 2.
  • the differential power is smaller than 0, a shortage power equal to the magnitude of the differential power occurs. From each power storage device 7, the power Wc obtained by evenly dividing the insufficient power by the number of power storage devices 7 is discharged to the DC bus 2.
  • Each power storage device 7 includes a storage battery 71, a BMU (Battery Management Unit: battery management device) 72, and a bidirectional DC / DC converter 73 (second converter).
  • BMU Battery Management Unit: battery management device
  • bidirectional DC / DC converter 73 second converter
  • the storage battery 71 is a device that can be charged and discharged.
  • the storage battery 71 is connected to the DC bus 2 via a bidirectional DC / DC converter 73.
  • Examples of the storage battery 71 include a lithium ion battery, a NAS (sodium-sulfur) battery, a redox flow battery, a lead storage battery, and a nickel hydrogen battery.
  • the storage batteries 71 included in the plurality of power storage devices 7 are of the same type and have the same storage capacity.
  • the storage capacity is the maximum storage capacity that can be stored.
  • the storage batteries 71 included in the plurality of power storage devices 7 may be different types of storage batteries, or may have different storage capacities.
  • the storage battery 71 includes, for example, a plurality of battery cells.
  • the BMU72 is a device that manages the storage battery 71.
  • the BMU 72 has a function of measuring the battery voltage Vbat of the storage battery 71 and a function of measuring the current value of the charge / discharge current of the storage battery 71 and calculating the SOC (State of charge).
  • the BMU 72 may further have a function of measuring the cell voltage of a plurality of battery cells constituting the storage battery 71.
  • the BMU 72 transmits the battery information of the storage battery 71 to the power management device 10.
  • the battery information includes the measured value of the battery voltage Vbat, the current value of the charge / discharge current, and the SOC.
  • the battery information may include the smallest cell voltage among the cell voltages of a plurality of battery cells.
  • the BMU 72 periodically transmits battery information to the power management device 10.
  • the bidirectional DC / DC converter 73 is connected to the DC bus 2 and is a device capable of bidirectionally converting the bus voltage Vbus and the battery voltage Vbat.
  • the bidirectional DC / DC converter 73 is provided between the storage battery 71 and the DC bus 2.
  • the battery voltage Vbat is the voltage of the storage battery 71.
  • a known bidirectional DC / DC converter can be used as the bidirectional DC / DC converter 73.
  • the bidirectional DC / DC converter 73 operates with an internally generated DC voltage based on, for example, the bus voltage Vbus.
  • the bidirectional DC / DC converter 73 is controlled by the power management device 10. Specifically, when the bidirectional DC / DC converter 73 receives a charging command from the power management device 10, the bidirectional DC / DC converter 73 converts the bus voltage Vbus into the battery voltage Vbat and causes the charging current to flow from the DC bus 2 to the storage battery 71. As a result, the storage battery 71 is charged. When the bidirectional DC / DC converter 73 receives the discharge command from the power management device 10, the bidirectional DC / DC converter 73 converts the battery voltage Vbat into the bus voltage Vbus and causes the discharge current to flow from the storage battery 71 to the DC bus 2. As a result, the storage battery 71 is discharged.
  • the bidirectional DC / DC converter 73 may charge or discharge the storage battery 71 by a constant current method, or may charge or discharge the storage battery 71 by a constant voltage method.
  • the bidirectional DC / DC converter 73 When the bidirectional DC / DC converter 73 receives a stop command from the power management device 10, the bidirectional DC / DC converter 73 stops its operation and shifts to a sleep state for reducing power consumption. When the bidirectional DC / DC converter 73 receives the charge command or the discharge command in the sleep state, the bidirectional DC / DC converter 73 wakes up from the sleep state and executes the charge process or the discharge process.
  • the bidirectional DC / DC converter 73 has a current limiting function that limits each current value of the charging current supplied to the storage battery 71 and the discharging current discharged from the storage battery 71 to the maximum current value (for example, 45A) or less of the storage battery 71. doing.
  • the bidirectional DC / DC converter 73 has a power measurement function for measuring power Wc.
  • the bidirectional DC / DC converter 73 for example, periodically measures the power Wc.
  • the bidirectional DC / DC converter 73 transmits the measured value of the power Wc to the power management device 10.
  • the power management device 10 is a device (controller) that manages the entire power supply system 1.
  • the power management device 10 is also referred to as an EMS (Energy Management System).
  • the power management device 10 is communicably connected to the power supply device 3, the auxiliary power supply device 5, the converter 6, and the power storage device 7 via a communication line.
  • the communication line may be configured by either wire or wireless.
  • the power management device 10 may perform communication conforming to standards such as RS-232C, RS-485, CAN (Controller Area Network), and Ethernet (registered trademark).
  • the power management device 10 performs a voltage measurement process for measuring the bus voltage Vbus.
  • the power management device 10 may directly measure the bus voltage Vbus.
  • the bidirectional DC / DC converter 73 may measure the bus voltage Vbus and transmit the measured value to the power management device 10, so that the power management device 10 may indirectly measure the bus voltage Vbus.
  • the power management device 10 transmits a start command and a stop command to each of the power conditioner 32, the AC / DC converter 52, the converter 6, and the bidirectional DC / DC converter 73.
  • the power management device 10 transmits a start command to the converter 6 to supply the converter 6 with a load voltage VL.
  • the power management device 10 stops the supply of the load voltage VL to the converter 6 by transmitting a stop command to the converter 6. The same applies to other converters.
  • the power management device 10 performs charge / discharge processing for charging / discharging the storage battery 71 by controlling the bidirectional DC / DC converter 73.
  • the power management device 10 performs charge / discharge processing according to the differential power.
  • the power management device 10 transmits a charging command to the bidirectional DC / DC converter 73, which is the differential power.
  • the surplus electric power is stored in the storage battery 71. That is, each storage battery 71 stores the power obtained by evenly dividing the surplus power according to the number of storage batteries 71.
  • the power management device 10 transmits a discharge command to the bidirectional DC / DC converter 73 to store the insufficient power in the storage battery 71. Release from. The power obtained by evenly dividing the insufficient power according to the number of storage batteries 71 is discharged from each storage battery 71.
  • the power management device 10 controls the start or stop of the auxiliary power supply device 5 based on the remaining battery level of the storage battery 71 and the amount of power generated by the renewable energy power generation device 31. Details of start control and stop control will be described later.
  • FIG. 2 is a hardware configuration diagram of the power management device shown in FIG.
  • the power management device 10 can be physically configured as a computer including hardware such as one or more processors 101, a memory 102, and a communication interface 103.
  • An example of the processor 101 is a CPU (Central Processing Unit).
  • the memory 102 may include a main storage device and an auxiliary storage device.
  • the main storage device is composed of RAM (Random Access Memory), ROM (Read Only Memory), and the like.
  • Examples of the auxiliary storage device include a semiconductor memory and a hard disk device.
  • the communication interface 103 is a device that transmits / receives data to / from another device.
  • the communication interface 103 is composed of, for example, a communication module conforming to communication standards such as RS-232C, RS-485, and CAN, a network interface card (NIC), or a wireless communication module.
  • NIC network interface card
  • each hardware When the processor 101 reads and executes the program stored in the memory 102, each hardware operates under the control of the processor 101, and the data in the memory 102 is read and written. As a result, each functional unit shown in FIG. 3 of the power management device 10 is realized.
  • FIG. 3 is a functional block diagram of the power management device shown in FIG. As shown in FIG. 3, the power management device 10 functionally includes an acquisition unit 11 (first acquisition unit), an acquisition unit 12 (second acquisition unit), and a control unit 13.
  • the power management device 10 functionally includes an acquisition unit 11 (first acquisition unit), an acquisition unit 12 (second acquisition unit), and a control unit 13.
  • the acquisition unit 11 is a functional unit that acquires the remaining battery level of the storage battery 71.
  • the acquisition unit 11 receives the battery information from each BMU 72, and acquires the SOC included in each battery information as the remaining amount of each storage battery 71. Since the cell voltage of the battery cell corresponds to the SOC of the battery cell, the acquisition unit 11 may acquire the minimum cell voltage included in each battery information as the remaining amount of each storage battery 71.
  • the acquisition unit 11 acquires the minimum remaining amount of the remaining amount of all the storage batteries 71 as the remaining amount of the battery.
  • the acquisition unit 11 may acquire the total remaining amount of all the storage batteries 71 as the battery remaining amount.
  • the remaining amount of each storage battery 71 is simply referred to as “remaining amount”
  • the remaining amount used for start control and stop control described later is referred to as "battery remaining amount”.
  • the acquisition unit 12 is a functional unit that acquires the amount of power generated by the renewable energy power generation device 31.
  • the acquisition unit 12 acquires the measured value of the generated power Wre from the power conditioner 32 as the amount of power generation.
  • the acquisition unit 12 uses the sum of the measured values of the generated power Wre acquired from each power conditioner 32 as the power generation amount.
  • the control unit 13 is a functional unit that controls the start or stop of the auxiliary power supply device 5 based on the remaining battery level of the storage battery 71 and the amount of power generated by the renewable energy power generation device 31.
  • the control unit 13 performs start control and stop control of the auxiliary power supply device 5 by using the storage thresholds Bdth1, Bdth2, Bct1, Bct2, and the power generation thresholds Gth1, Gth2.
  • the storage thresholds Bds1 and Bds2 are used when the storage battery 71 is discharged.
  • the storage threshold value Bds1 (first storage threshold value) is a threshold value for determining that the storage battery 71 is near the sky.
  • the storage threshold value Bds1 is set to a value larger than the storage threshold value Bds2.
  • the storage threshold value Bds2 (second storage threshold value) is a threshold value for determining that the storage battery 71 is about to become empty. Therefore, the storage threshold value Bds2 is set to a value slightly larger than 0.
  • the storage thresholds Bct1 and Bct2 are used when the storage battery 71 is being charged.
  • the storage threshold value Bct1 (fourth storage threshold value) is a threshold value for determining that the storage battery 71 is out of the near-empty state.
  • the storage threshold Bct1 is set to a value larger than the storage threshold Bct2 and equal to or higher than the storage threshold Bds1.
  • the storage threshold value Bct2 (third storage threshold value) is a threshold value for determining that the storage battery 71 is out of the state near the space.
  • the storage threshold Bct2 is set to a value equal to or higher than the storage threshold Bds2.
  • the power generation threshold Gth1 (first power generation threshold) is a threshold for determining that the amount of power generated by the renewable energy power generation device 31 is insufficient.
  • the power generation threshold value Gth2 (second power generation threshold value) is a threshold value for determining that the amount of power generated by the renewable energy power generation device 31 is sufficient.
  • the power generation threshold Gth2 is set to a value larger than the power generation threshold Gth1.
  • FIG. 5 is a flowchart showing a series of processes of start control performed by the power management device shown in FIG.
  • the series of processes shown in FIG. 5 is started, for example, in response to the auxiliary power supply device 5 being stopped.
  • the acquisition unit 11 acquires the remaining battery level of the storage battery 71 (step S11).
  • the acquisition unit 11 receives battery information from each BMU 72, for example, and acquires the SOC included in each battery information as the remaining amount of each storage battery 71.
  • the acquisition unit 11 may acquire the minimum cell voltage included in each battery information as the remaining amount of each storage battery 71.
  • the acquisition unit 11 acquires the minimum remaining amount of the remaining amount of all the storage batteries 71 as the remaining amount of the battery.
  • the acquisition unit 11 may acquire the total remaining amount of all the storage batteries 71 as the battery remaining amount. Then, the acquisition unit 11 outputs the remaining battery level to the control unit 13.
  • the acquisition unit 12 acquires the amount of power generated by the renewable energy power generation device 31 (step S12).
  • the acquisition unit 12 acquires, for example, the measured value of the generated power Wre from the power conditioner 32 as the amount of power generation.
  • the acquisition unit 12 uses the sum of the measured values of the generated power Wre acquired from each power conditioner 32 as the power generation amount. Then, the acquisition unit 12 outputs the amount of power generation to the control unit 13.
  • step S13 when the control unit 13 receives the remaining battery level from the acquisition unit 11 and the amount of power generation from the acquisition unit 12, the remaining battery level is higher than the storage threshold value Bds2 by comparing the remaining battery level with the storage threshold value Bds2. Is also small (step S13).
  • step S13 determines that the remaining battery level is equal to or higher than the storage threshold value Bds2 (step S13; NO)
  • step S13 compares the remaining battery level with the storage threshold value Bds1 to store the remaining battery level. It is determined whether or not it is smaller than the threshold value Bds1 (step S14).
  • step S14 When it is determined in step S14 that the remaining battery level is equal to or higher than the storage threshold value Bds1 (step S14; NO), it can be said that the storage battery 71 has a sufficient remaining battery level. Therefore, the control unit 13 performs the process of step S11 again without activating the auxiliary power supply device 5. On the other hand, when it is determined in step S14 that the remaining battery level is smaller than the storage threshold value Bds1 (step S14; YES), the control unit 13 compares the power generation amount with the power generation threshold Gth1 to generate power. It is determined whether or not it is smaller than the threshold value Gth1 (step S15).
  • step S15 When it is determined in step S15 that the amount of power generation is equal to or greater than the power generation threshold value Gth1 (step S15; NO), the storage battery 71 has a certain amount of remaining battery power, and a certain amount of power generation can be obtained. Therefore, the control unit 13 performs the process of step S11 again without activating the auxiliary power supply device 5. On the other hand, when it is determined in step S15 that the amount of power generation is smaller than the power generation threshold value Gth1 (step S15; YES), the storage battery 71 has a certain amount of remaining battery power, but the amount of power generation is not sufficient. Therefore, the control unit 13 transmits an activation command to the auxiliary power supply device 5 to activate the auxiliary power supply device 5 (step S16). As a result, a series of start control processes is completed.
  • step S13 when it is determined that the remaining battery level is smaller than the storage threshold value Bds2 (step S13; YES), the storage battery 71 is almost empty. Therefore, the control unit 13 transmits a start command to the auxiliary power supply device 5 and starts the auxiliary power supply device 5 regardless of the amount of power generation (step S16). As a result, a series of start control processes is completed.
  • step S13 the control unit 13 determines whether or not the remaining battery level is smaller than the storage threshold value Bds2, but may determine whether or not the remaining battery level is equal to or lower than the storage threshold value Bds2. .. Similarly, in step S14, the control unit 13 may determine whether or not the remaining battery level is equal to or less than the storage threshold value Bds1. In step S15, the control unit 13 may determine whether or not the amount of power generation is equal to or less than the power generation threshold value Gth1.
  • the control unit 13 activates the auxiliary power supply device 5 when the remaining battery level is larger than the storage threshold value Bds2, the remaining battery level is smaller than the storage threshold value Bdth1, and the amount of power generation is smaller than the power generation threshold value Gth1.
  • the control unit 13 activates the auxiliary power supply device 5 regardless of the amount of power generation.
  • the control unit 13 does not start the auxiliary power supply device 5 when the remaining battery level is larger than the storage threshold value Bds2, the remaining battery level is smaller than the storage threshold value Bdth1, and the amount of power generation is larger than the power generation threshold value Gth1.
  • the control unit 13 does not start the auxiliary power supply device 5 regardless of the amount of power generation.
  • step S12 may be performed at any timing as long as it is before step S15. If it is determined in step S13 that the remaining battery level is smaller than the storage threshold value Bds2, step S12 may not be performed.
  • FIG. 6 is a flowchart showing a series of stop control processes performed by the power management device shown in FIG.
  • the series of processes shown in FIG. 6 is started, for example, in response to the activation of the auxiliary power supply device 5.
  • step S21 and S22 Since the processing of steps S21 and S22 is the same as that of steps S11 and S12, the description thereof will be omitted. Subsequently, when the control unit 13 receives the remaining battery level from the acquisition unit 11 and the amount of power generation from the acquisition unit 12, the remaining battery level is higher than the storage threshold value Bct1 by comparing the remaining battery level with the storage threshold value Bcts1. Is also large (step S23). When it is determined in step S23 that the remaining battery level is equal to or lower than the storage threshold value Bct1 (step S23; NO), the control unit 13 compares the remaining battery level with the storage threshold value Bct2 to store the remaining battery level. It is determined whether or not it is larger than the threshold value Bct2 (step S24).
  • step S24 When it is determined in step S24 that the remaining battery level is equal to or less than the storage threshold Bct2 (step S24; NO), the storage battery 71 is in a state close to space. Therefore, the control unit 13 performs the process of step S21 again without stopping the auxiliary power supply device 5. On the other hand, when it is determined in step S24 that the remaining battery level is larger than the storage threshold Bct2 (step S24; YES), the control unit 13 compares the power generation amount with the power generation threshold Gth2 to generate power. It is determined whether or not it is larger than the threshold value Gth2 (step S25).
  • step S25 When it is determined in step S25 that the amount of power generation is equal to or less than the power generation threshold value Gth2 (step S25; NO), the storage battery 71 has a certain amount of remaining battery power, but a sufficient amount of power generation cannot be obtained. Therefore, the control unit 13 performs the process of step S21 again without stopping the auxiliary power supply device 5. On the other hand, when it is determined in step S25 that the amount of power generation is larger than the power generation threshold value Gth2 (step S25; YES), the storage battery 71 has a certain amount of remaining battery power, and a sufficient amount of power generation can be obtained. Therefore, the control unit 13 transmits a stop command to the auxiliary power supply device 5 to stop the auxiliary power supply device 5 (step S26). As a result, a series of stop control processes is completed.
  • step S23 If it is determined in step S23 that the remaining battery level is larger than the storage threshold value Bct1 (step S23; YES), the storage battery 71 has a sufficient remaining battery level. Therefore, the control unit 13 transmits a stop command to the auxiliary power supply device 5 and stops the auxiliary power supply device 5 regardless of the amount of power generation (step S26). As a result, a series of stop control processes is completed.
  • step S23 the control unit 13 determines whether or not the remaining battery level is larger than the storage threshold value Bcts1, but may determine whether or not the remaining battery level is equal to or higher than the storage threshold value Bcts1. .. Similarly, in step S24, the control unit 13 may determine whether or not the remaining battery level is equal to or higher than the storage threshold value Bct2. In step S25, the control unit 13 may determine whether or not the amount of power generation is equal to or greater than the power generation threshold value Gth2.
  • the control unit 13 stops the auxiliary power supply device 5.
  • the control unit 13 stops the auxiliary power supply device 5 regardless of the amount of power generation.
  • the control unit 13 does not stop the auxiliary power supply device 5 when the battery remaining amount is larger than the storage threshold value Bct2, the battery remaining amount is smaller than the storage storage threshold value Bcts1, and the power generation amount is smaller than the power generation threshold value Gth2.
  • the control unit 13 does not stop the auxiliary power supply device 5 regardless of the amount of power generation.
  • step S22 may be performed at any timing as long as it is before step S25. If it is determined in step S23 that the remaining battery level is larger than the storage threshold Bct1, step S22 may not be performed.
  • FIG. 7 is a diagram for explaining the operating time of the auxiliary power supply device when start control and stop control are performed by the power management device shown in FIG.
  • FIG. 8 is a diagram for explaining the operating time of the auxiliary power supply device when start control and stop control are performed by the power management device of the comparative example.
  • the horizontal axis of FIGS. 7 and 8 indicates the elapsed time (unit: au). “A.u.” means an arbitrary unit.
  • the vertical axis on the left side of FIGS. 7 and 8 shows the remaining battery level (unit:%) of the storage battery, and the vertical axis on the right side shows the amount of power generated by the renewable energy power generation device (unit: W).
  • the power management device of the comparative example controls the activation of the auxiliary power supply device 5 by using only the storage threshold value Bds1. Specifically, the power management device of the comparative example activates the auxiliary power supply device 5 when the remaining battery level of the storage battery 71 is smaller than the storage threshold value Bds1, and does not activate the auxiliary power supply device 5 in other cases.
  • the power management device of the comparative example controls the stop of the auxiliary power supply device 5 by using only the storage threshold Bct1. Specifically, the power management device of the comparative example stops the auxiliary power supply device 5 when the remaining battery level of the storage battery 71 is larger than the storage threshold value Bct1, and does not stop the auxiliary power supply device 5 in other cases.
  • the waveforms of the system power Ws shown in FIGS. 7 and 8 were obtained by calculation under the following conditions.
  • the load power WL was set to 20000 W
  • the system power Ws was set to 30000 W
  • the generated power Wre power generation amount
  • the storage threshold Bds2 was set to 8%
  • the storage threshold Bct2 was set to 9%
  • the storage threshold Bds1 was set to 10%
  • the storage threshold Bct1 was set to 17%
  • the power generation threshold Gth1 was set to 5000 W
  • the power generation threshold Gth2 was set to 7000 W.
  • the power management device of the comparative example activates the auxiliary power supply device 5 when the remaining battery level becomes less than the storage threshold value Bds1, and then activates the auxiliary power supply device 5 when the remaining battery level exceeds the storage threshold value Bcts1. Stop.
  • the operating time of the auxiliary power supply device 5 is 280 [a. u. ]Met.
  • the power management device 10 does not start the auxiliary power supply device 5 while the remaining battery level is the storage threshold value Bds2 or more and the generated power Wre is the power generation threshold value Gth1 or more.
  • the power management device 10 activates the auxiliary power supply device 5 when the remaining battery level falls below the storage threshold value Bds2.
  • the power management device 10 stops the auxiliary power supply device 5.
  • the operating time of the auxiliary power supply device 5 is 165 [a. u. ]Met. Therefore, the operating time of the auxiliary power supply device 5 is shortened by about 40% as compared with the comparative example.
  • the auxiliary power supply device 5 is started or stopped in consideration of not only the remaining battery level of the storage battery 71 but also the amount of power generated by the renewable energy power generation device 31. Is controlled. For example, even if the remaining battery level of the storage battery 71 is reduced, it is possible not to start the auxiliary power supply device 5 if a sufficient amount of power generation can be obtained. In a situation where the auxiliary power supply device 5 is operating, even if the remaining battery level of the storage battery 71 is not sufficiently large, the auxiliary power supply device 5 can be stopped if a sufficient amount of power generation can be obtained. As a result, the operating time of the auxiliary power supply device 5 can be shortened. Since renewable energy is used instead of operating the auxiliary power supply device 5, the cost can be reduced.
  • the control unit 13 has the condition that the remaining battery level is smaller than the storage threshold value Bdth1, the remaining battery level is larger than the storage threshold value Bdth2, and the amount of power generation is smaller than the power generation threshold value Gth1, or the battery remaining amount.
  • the auxiliary power supply device 5 is activated.
  • the control unit 13 does not start the auxiliary power supply device 5 if any of the above conditions is not satisfied.
  • the auxiliary power supply device 5 is activated when the storage battery 71 has a certain amount of battery remaining and a certain amount of power generation can be obtained. Not done. Therefore, the timing of starting the auxiliary power supply device 5 can be delayed. As a result, the operating time of the auxiliary power supply device 5 can be shortened.
  • the control unit 13 has the condition that the remaining battery level is larger than the storage threshold value Bct2, the remaining battery level is smaller than the storage threshold value Bcts1, and the amount of power generation is larger than the power generation threshold value Gth2, or the battery remaining amount.
  • the auxiliary power supply device 5 is stopped.
  • the control unit 13 does not stop the auxiliary power supply device 5 when any of the above conditions is not satisfied.
  • the auxiliary power supply device 5 is stopped when the storage battery 71 has a certain amount of battery remaining and a certain amount of power generation can be obtained. NS. Therefore, the timing of stopping the auxiliary power supply device 5 can be accelerated. As a result, the operating time of the auxiliary power supply device 5 can be shortened.
  • the power management device, power supply system, and power management method according to the present disclosure are not limited to the above embodiments.
  • the power management device 10 may be composed of one device that is physically or logically coupled, or may be composed of a plurality of devices that are physically or logically separated from each other.
  • the power management device 10 may be realized by a plurality of computers distributed on a network as in cloud computing.
  • At least one of the power conditioner 32, the AC / DC converter 52, the converter 6, and the bidirectional DC / DC converter 73 does not have to have a power measurement function.
  • the power management device 10 may acquire the measured value of each power from the measured value of the voltage measured by the voltage sensor and the measured value of the current measured by the current sensor.
  • the power supply device 3 may be provided with another power generation device instead of the renewable energy power generation device 31.
  • the auxiliary power supply device 5 may be provided with a power generation device instead of the commercial power supply 51.
  • a power generator is a diesel generator.
  • the number of the auxiliary power supply devices 5 is not limited to one, and may be appropriately changed as needed.
  • the power supply system 1 is also referred to as a stand-alone DC power supply system.
  • each of the power conditioner 32, the AC / DC converter 52, the converter 6, and the bidirectional DC / DC converter 73 operates with the DC voltage generated inside the apparatus.
  • the power supply system 1 includes a power supply unit, and the power supply unit generates a DC voltage having a constant voltage value from the bus voltage Vbus of the DC bus 2 and supplies the DC voltage (power) to each device. You may.
  • the storage threshold Bct1 may be set to a value larger than the storage threshold Bds1 in order to avoid frequent switching of whether or not the storage battery 71 is near the sky.
  • the storage threshold Bct2 may be set to a value larger than the storage threshold Bds2 in order to avoid frequent switching of whether or not the storage battery 71 is close to the space.
  • step S13 may be omitted. That is, the control unit 13 activates the auxiliary power supply device 5 when the remaining battery level is smaller than the storage threshold value Bds1 and the amount of power generation is smaller than the power generation threshold value Gth1. In other cases, the control unit 13 does not activate the auxiliary power supply device 5. In this configuration, even if the remaining battery level of the storage battery 71 becomes smaller than the storage threshold value Bds1, the auxiliary power supply device 5 is not activated when a certain amount of power generation can be obtained. Therefore, the timing of starting the auxiliary power supply device 5 can be delayed. As a result, the operating time of the auxiliary power supply device 5 can be shortened.

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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

Ce dispositif de gestion d'énergie comprend : une première unité d'acquisition pour acquérir la quantité restante de batterie d'une batterie de stockage connectée à un bus CC par l'intermédiaire d'un convertisseur ; une seconde unité d'acquisition pour acquérir la quantité d'énergie produite par un dispositif de production d'énergie inclus dans un dispositif d'alimentation électrique pour fournir de l'énergie au bus CC ; et une unité de commande pour commander, sur la base de la quantité restante de batterie et de la quantité d'énergie produite, le démarrage ou l'arrêt d'un dispositif d'alimentation électrique auxiliaire pour fournir de l'énergie au bus CC.
PCT/JP2020/013413 2020-03-25 2020-03-25 Dispositif de gestion d'énergie, système d'alimentation en énergie et procédé de gestion d'énergie WO2021192108A1 (fr)

Priority Applications (2)

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JP2022510228A JP7367852B2 (ja) 2020-03-25 2020-03-25 電力管理装置、給電システム、及び電力管理方法
PCT/JP2020/013413 WO2021192108A1 (fr) 2020-03-25 2020-03-25 Dispositif de gestion d'énergie, système d'alimentation en énergie et procédé de gestion d'énergie

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004064814A (ja) * 2002-07-25 2004-02-26 Kawasaki Heavy Ind Ltd 電力供給方法および電力供給システム
JP2013150369A (ja) * 2012-01-17 2013-08-01 Mitsubishi Electric Corp 系統連系用電力変換システム
WO2015198678A1 (fr) * 2014-06-26 2015-12-30 シャープ株式会社 Système d'alimentation électrique et dispositif de commande

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014128152A (ja) 2012-12-27 2014-07-07 Panasonic Corp 充放電制御装置、充放電制御システム、および、充放電制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004064814A (ja) * 2002-07-25 2004-02-26 Kawasaki Heavy Ind Ltd 電力供給方法および電力供給システム
JP2013150369A (ja) * 2012-01-17 2013-08-01 Mitsubishi Electric Corp 系統連系用電力変換システム
WO2015198678A1 (fr) * 2014-06-26 2015-12-30 シャープ株式会社 Système d'alimentation électrique et dispositif de commande

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