WO2012144358A1 - Dispositif d'alimentation en courant, procédé de commande pour dispositif d'alimentation en courant et système d'alimentation en courant continu - Google Patents

Dispositif d'alimentation en courant, procédé de commande pour dispositif d'alimentation en courant et système d'alimentation en courant continu Download PDF

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Publication number
WO2012144358A1
WO2012144358A1 PCT/JP2012/059604 JP2012059604W WO2012144358A1 WO 2012144358 A1 WO2012144358 A1 WO 2012144358A1 JP 2012059604 W JP2012059604 W JP 2012059604W WO 2012144358 A1 WO2012144358 A1 WO 2012144358A1
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WO
WIPO (PCT)
Prior art keywords
bus
power supply
voltage
storage battery
power
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Ceased
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PCT/JP2012/059604
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English (en)
Japanese (ja)
Inventor
義明 野崎
藤田　敏之
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Sharp Corp
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Sharp Corp
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Publication of WO2012144358A1 publication Critical patent/WO2012144358A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • H02J3/322—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H02J3/46—Controlling the sharing of generated power between the generators, sources or networks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a power supply apparatus, a control method for the power supply apparatus, and a DC power supply system in a small-scale area that can be controlled independently from an AC system such as a home.
  • Photovoltaic power generation has been required to be connected to an AC system or connected to AC power distribution in the home, so it has been necessary to convert the generated DC output to AC power by a power conditioner.
  • the supply of AC power is suitable for household appliances and general lighting equipment using a motor such as a vacuum cleaner, a washing machine, an air conditioner, and a refrigerator.
  • a motor such as a vacuum cleaner, a washing machine, an air conditioner, and a refrigerator.
  • the progress of LED lighting, and home appliances that have been operating by performing AC-DC conversion in devices such as TV devices and audio devices. For this reason, AC distribution is not always excellent in the home.
  • a DC power supply system connected to DC home appliances operating by external DC power supply in a small area such as a general home.
  • a DC device 130 such as an air conditioner or a TV apparatus is directly connected without AC-DC conversion or via a DC-DC converter (not shown).
  • DC power is supplied to the DC bus B from the photovoltaic power generator 110 (for example, output voltage 100V to 380V) via the DC-DC converter 120 without DC-AC conversion.
  • the bus voltage of the DC bus B is controlled so as to be held at a voltage within a certain range of, for example, 380V to 400V.
  • the storage battery 111 such as a lithium ion battery, which has been developed recently, can be connected to the DC bus B via the DC-DC converter 121, so that surplus power can be stored, and direct current can be stored.
  • the power supply system 101 has been pushed to an increasingly realistic one.
  • the concept of optimizing the power network in a small-scale area such as a general home by introducing a direct current power supply system or the like is called the microgrid.
  • Patent Document 1 describes a DC power supply system that improves power efficiency when a storage battery is provided in a DC power supply path.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2008-048470 (published February 28, 2008)”
  • the storage battery 111 discharges the stored power to the DC bus B via the DC-DC converter 121 so as to compensate for the gradual voltage drop of the DC bus.
  • the DC-DC converter 121 boosts the output voltage (for example, 30 V to 60 V) of the storage battery 111 to the voltage of the DC bus B.
  • the DC power distribution system has a problem that more than a certain amount of power is consumed even during the load downtime period, and improvement in power efficiency is hindered.
  • the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a power supply apparatus and a power supply apparatus control method capable of obtaining high power efficiency by suppressing power consumption during a load suspension time period. And a DC power supply system.
  • the power supply device of the present invention provides A power supply device that is supplied with DC power from a DC power supply means and that supplies DC power to a connected DC device, A DC bus serving as a bus for the DC power supply, Power storage means for charging and discharging with the DC bus; DC-converting the DC power to be transferred between at least one of the DC bus, the DC device, the DC power supply means, and the power storage means connected to the DC bus.
  • DC conversion means The first storage battery as the power storage means, wherein the first DC-DC converter as the DC-DC conversion means is connected between the DC bus and the first storage battery.
  • a switch circuit connected in parallel with the first DC-DC converter between the DC bus and the first storage battery; And a control unit that performs conduction cutoff control of the switch circuit.
  • the DC power supply system of the present invention A DC power supply system that supplies DC power to a connected DC device, A DC bus serving as a bus for the DC power supply, DC power supply means for supplying DC power to the DC bus; Power storage means for charging and discharging with the DC bus; DC-converting the DC power to be transferred between at least one of the DC bus, the DC device, the DC power supply means, and the power storage means connected to the DC bus.
  • DC conversion means The first storage battery as the power storage means, wherein the first DC-DC converter as the DC-DC conversion means is connected between the DC bus and the first storage battery.
  • a switch circuit connected in parallel with the first DC-DC converter between the DC bus and the first storage battery; And a control unit that performs conduction cutoff control of the switch circuit.
  • the switch circuit if the switch circuit is made conductive by the control unit, power can be supplied from the first storage battery to the DC bus via the switch circuit. Therefore, it is possible to stop the operating power supply of the DC-DC converting means including the first DC-DC converter during a load suspension period such as midnight. Therefore, power consumption can be reduced by stopping the operating power supply of the DC-DC converting means.
  • Patent Document 1 when a storage battery (battery unit) supplies power, the DC system control unit is controlled by communication to adjust the DC power consumption, thereby optimizing the power output of the storage battery. Moreover, in patent document 1, when optimizing the power output of a storage battery, a DC / DC converter is always interposed between the storage battery and the DC unit. On the other hand, the present invention is characterized in that the direct current unit is not controlled, and when the power consumption of the direct current unit is reduced, the storage battery and the direct current bus are directly connected to stop the DC / DC converter.
  • FIG. 1 illustrates an embodiment of the present invention and is a diagram illustrating a relationship between a voltage of a first storage battery and a connection state to a DC bus.
  • FIG. 3 is a graph showing an embodiment of the present invention and showing a load curve representing a change in daily power consumption in the DC power supply system of FIG. 1. It is a block diagram which shows a prior art and shows the structure of a DC power supply system. It is a graph which shows a prior art and shows the load curve showing the change of the daily electric power consumption in the direct-current power supply system of FIG.
  • FIGS. 1 to 4 Embodiments of the present invention will be described with reference to FIGS. 1 to 4 as follows.
  • FIG. 1 shows the configuration of a DC power supply system 1 and a power supply device 2 according to this embodiment.
  • the DC power supply system 1 configured by the power supply device 2 and solar power generation supplies DC power to the connected DC device 30.
  • the DC power supply system 1 is shown as a power distribution system in a general household as an example.
  • the DC power supply system 1 includes a power supply device 2, a solar power generation device (DC power supply means: indicated as “solar” in the figure) 10, a DC-DC converter (DC-DC conversion means) 20, and an AC-DC.
  • a converter (DC power supply means) 23 is provided.
  • the power supply device 2 includes a DC bus (direct current bus) B, a storage battery (power storage means, first storage battery) 11, a storage battery (power storage means, second storage battery) 12, a switch circuit 13, and a controller (control unit). 14, a DC-DC converter (DC-DC converter) 22 and a DC-DC converter (DC-DC converter, first DC-DC converter) 21 are provided.
  • the DC device 30 is a load device such as a DC home appliance that operates with DC power such as an air conditioner or a TV apparatus.
  • DC power such as an air conditioner or a TV apparatus.
  • the DC device 30 operates with a DC voltage of 360V to 400V.
  • the DC device 30 is connected to the DC bus B without a DC-DC converter.
  • the DC device 30 may be connected to the DC bus B via a switch such as a power switch, even if it is not connected to the DC bus B without a DC-DC converter.
  • the DC bus B carries power supplied to the DC device 30 as a bus of the power supply device 2.
  • the bus voltage range of the DC bus B is within the operating voltage range of the DC device 30, that is, a voltage of 360 to 400 V DC here. Within the range.
  • the bus voltage range of the DC bus B is set to the operating voltage range of the DC device 30 connected to the DC bus B without a DC-DC converter.
  • the solar power generation device 10 supplies DC power generated on the DC bus B.
  • the solar power generation device 10 outputs a DC output voltage corresponding to the number of cell arrays, for example, 100V to 380V.
  • the output voltage need not be DC-AC converted when power is supplied to the DC bus B. Therefore, the output voltage is converted into the bus voltage of the DC bus B by the DC-DC converter 20 that performs voltage conversion of the DC power transferred between the photovoltaic power generation apparatus 10 and the DC bus B.
  • the DC-DC converter 20 includes a boost converter that boosts the output voltage of the photovoltaic power generation apparatus 10 to the bus voltage of the DC bus B.
  • the DC-DC converter 20 may be a step-down converter that steps down the output voltage of the photovoltaic power generation apparatus 10 to the bus voltage of the DC bus B.
  • the solar power generation device 10 is provided as a DC power supply means, the solar power generation device 10 can be suitably used for the power supply device 2 without significantly reducing the use efficiency of the generated power.
  • the solar power generation device 10 may be linked to a commercial AC system so that the generated power can be sold. It is not always necessary to provide the solar power generation device 10 as the DC power supply means.
  • the AC-DC converter 23 may convert the AC power of the AC distribution network 40 into DC power and supply it to the DC bus B as DC power supply means.
  • This AC power distribution network is, for example, an AC 200V power source using a single-phase three-wire drawn into a house from a commercial AC system.
  • a boost converter is used here because the bus voltage of the DC bus B is larger than the rectified voltage of the AC voltage of the AC distribution network 40, but the bus voltage of the DC bus B is used for the AC distribution network 40. When it is smaller than the rectified voltage of the AC voltage, a step-down converter is used.
  • a chemical fuel power generation device such as a fuel cell
  • a natural energy power generation device such as a wind power generation device (final output is set to DC), and the like are also possible.
  • the storage battery 11 is composed of an arbitrary secondary battery.
  • the storage battery 11 is assumed to be a lithium ion battery mounted on an electric vehicle (EV). Since the battery for electric vehicles has high output and excellent charge / discharge characteristics, it is easily adapted to the power supply device 2.
  • EV electric vehicle
  • lead storage batteries used for electric equipment in general vehicles or office buildings / factories, nickel cadmium batteries and nickel hydride batteries mounted in hybrid vehicles, sodium sulfur batteries (NAS batteries), etc. are used as the storage batteries 11. Is possible.
  • the rechargeable battery 11 in FIG. 1 has a chargeable voltage range of, for example, 220V to 400V. That is, the rechargeable voltage range of the storage battery 11 includes the bus voltage range of the DC bus B.
  • the storage battery 11 charges and discharges with the DC bus B via a DC-DC converter 21 that performs voltage conversion of DC power transferred between the storage battery 11 and the DC bus B. Since the switch circuit 13 is provided in the power supply device 2 as will be described later, the DC-DC converter 21 is a boost converter that boosts the bus voltage of the DC bus B to the voltage of the storage battery 11 here.
  • the DC-DC converter 21 may be a bidirectional DC-DC converter in which the step-up converter and a step-down converter that steps down the bus voltage of the DC bus B to the voltage of the storage battery 11 are combined.
  • the storage battery 11 is detachable from the power supply device 2.
  • the storage battery 11 is a battery for an electric vehicle, for example, the storage battery 11 is mounted on the vehicle in a state where the storage battery 11 is charged at a charging station or a 200V or 100V commercial AC power source at home, or after driving. It is possible to attach to the power supply device 2 through a DC output connector provided on the power supply 2.
  • the storage battery 11 may be provided as a battery pack that can be attached to and detached from the vehicle, and the battery pack may be attached to the power supply device 2.
  • the power supply device 2 itself may be used for charging the storage battery 11 for driving the vehicle. In that case, it is advantageous if a socket for DC charging is provided on the vehicle side.
  • the storage battery 11 When the storage battery 11 is a battery for a hybrid vehicle, the storage battery 11 charged while the vehicle is running can be attached to the power supply device 2. In this case, the storage battery 11 charged by the power supply device 2 can be used for vehicle travel. Thus, when the storage battery 11 is not used for the power supply device 2, the storage battery 11 can be used for other purposes. When a vehicle-mounted battery is used as the storage battery 11, the storage battery 11 can be used at times other than when the vehicle is running, and the utilization efficiency is increased. In addition, the output voltage of the on-vehicle battery is easily adapted to the bus voltage of the DC bus B. The storage battery 11 can be adapted so that it can be used in any device as a portable DC power supply other than for vehicles. In general, a device for converting the output voltage of the storage battery 11 to DC 12V is combined. It is clear from that. The storage battery 11 may be always connected to the power supply device 2 for use.
  • the storage battery 12 is also composed of a secondary battery similar to the storage battery 11.
  • the rechargeable voltage of the storage battery 12 is smaller than the value of the bus voltage range of the DC bus B, and is, for example, in the range of 30V to 60V. That is, in comparison with the rechargeable voltage range, the storage battery 11 is a high voltage storage battery, whereas the storage battery 12 is a low voltage storage battery.
  • the storage battery 12 charges and discharges with the DC bus B via a DC-DC converter 22 that performs voltage conversion of electric power transferred between the storage battery 12 and the DC bus B. Since the storage battery 12 is a low-voltage storage battery, the safety when used in a general home or in a limited space is high.
  • the DC-DC converter 22 is a bidirectional combination of a step-down converter that operates when charging the storage battery 12 from the DC bus B and a boost converter that operates when discharging from the storage battery 12 to the DC bus B. It is a DC-DC converter.
  • the storage battery 12 is always connected to the power supply device 2 and used, the storage battery 12 may be detachable from the power supply device 2 similarly to the storage battery 11.
  • the switch circuit 13 is connected in parallel with the DC-DC converter 21 between the DC bus B and the storage battery 11.
  • the switch circuit 13 has a configuration including a field effect transistor 13a in which protective diodes 13b are connected in parallel.
  • the switch circuit 13 other arbitrary switch elements such as a thyristor, an insulated gate bipolar transistor (IGBT), and an electromagnetic switch (magnet switch) can be used. Since the switch circuit 13 only operates at a certain timing as will be described later, the power consumption is generally small. Therefore, the switch circuit 13 may be a switch element that operates by AC driving.
  • the controller 14 performs conduction cutoff control of the switch circuit 13.
  • the controller 14 monitors the voltage Vb of the DC bus B and the voltage Vs of the storage battery 11, and instructs whether the switch circuit 13 is turned on or off according to the detected voltage Vb and voltage Vs.
  • a control signal s1 is output.
  • the control signal s1 is a gate signal of the field effect transistor 13a when the switch circuit 13 includes the field effect transistor 13a. Further, the controller 14 controls turning on / off of the operating power of the DC-DC converters 20, 21, 22 and the AC-DC converter 23 when conducting the conduction cutoff control of the switch circuit 13.
  • the controller 14 operates the DC-DC converters 20, 21 and 22 and the AC-DC converter 23 in accordance with the detected voltage Vb and voltage Vs in order to turn on and off the operation power.
  • a control signal s2 for instructing whether to turn on or off the power is output.
  • the switch circuit 13 and the controller 14 may be housed in, for example, one control panel as the direct connection control unit 15 that controls whether or not the storage battery 11 and the DC bus B are directly connected.
  • FIG. 2 (a) shows a basic configuration of a DC-DC converter used in the DC-DC converters 20, 21, and 22.
  • the basic configuration of the DC-DC converter includes a converter unit 201 and a control unit 202.
  • the converter unit 201 includes, for example, a choke coil 201a, a switching transistor 201b, and a switching transistor 201c.
  • the choke coil 201a and the switching transistor 201c are connected in series with the choke coil 201a as an input side.
  • the switching transistor 201b is connected between a connection point between the choke coil 201a and the switching transistor 201c and a common line.
  • the control unit 202 inputs the control signal X1 shown in FIG. 2B to the gate terminal which is the control terminal of the switching transistor 201b, and controls the conduction interruption of the switching transistor 201b. Further, the control unit 202 inputs the control signal X2 shown in FIG. 2B to the gate terminal which is the control terminal of the switching transistor 201c, and controls the conduction interruption of the switching transistor 201c.
  • Each of the control signals X1 and X2 is composed of a binary voltage of an active level (here, High) and an inactive level (here, Low). The active period of the control signal X1 and the active period of the control signal X2 do not overlap each other.
  • the current flowing through the choke coil 201a and the switching transistor 201b increases so as to have a proportional constant that depends on the input voltage and the self-inductance of the choke coil 201a when the conduction resistance of the switching transistor 201b is small. That is, the magnitude of the magnetic energy accumulated in the choke coil 201a changes according to the length of the conduction period of the switching transistor 201b. Therefore, the magnitude of the output voltage of the DC-DC converter can be controlled by adjusting the length of the conduction period of the switching transistor 201b and the length of the conduction period of the switching transistor 201c.
  • 2A can be used as a step-up converter or a step-down converter.
  • the DC-DC converters 20 and 21 include only the boost converter in the above example, it is sufficient to have one basic configuration shown in FIG. Since the DC-DC converter 22 includes a step-up converter and a step-down converter, the two basic configurations shown in FIG. 2A can be combined in antiparallel with each other. At this time, when one operates as a step-up converter or a step-down converter, the other stops operating.
  • the DC-DC converter 21 as will be described later, when the bus voltage of the DC bus B and the voltage of the storage battery 11 become a predetermined voltage equal to each other, the switch circuit 13 is turned on, and the DC bus B and the storage battery 11 are mutually connected. Directly connected. Accordingly, the length of the conduction period of the switching transistor 201b of the DC-DC converter 21 and the length of the conduction period of the switching transistor 201c are adjusted until the DC bus B and the storage battery 11 reach the predetermined voltage.
  • DC power is supplied to the DC device 30 from morning to night by the power supplied from the photovoltaic power generation device 1 to the DC bus B and the power supplied from the AC distribution network 40 to the DC bus B during daylight hours. Is supplied.
  • the storage battery 12 is normally charged from the DC bus B.
  • the power is insufficient, the storage battery 12 is discharged to the DC bus B.
  • FIG. 4 shows a load curve representing an example of changes in the daily power consumption at this time.
  • the storage battery 11 may or may not be attached to the power supply device 2. However, as an example, the storage battery 11 is removed from the power supply device 2 from morning to night and is used for vehicle travel, and power is supplied from midnight to the next morning. Consider the case where the device 2 is mounted.
  • the DC device 30 as a load stops operating except for performing a standby operation. Therefore, at midnight, power consumption is smaller than from morning to night. Therefore, the storage battery 11 is mounted on the power supply device 2 at midnight, and power is supplied to the DC bus B by discharging from the storage battery 11. At this time, the switch circuit 13 is controlled to be in a conductive state, and the operation power sources of the DC-DC converters 20, 21, 22 and the AC-DC converter 23 are stopped.
  • Step 1 When the storage battery 11 is attached to the power supply device 2, the controller 14 receives an attachment detection signal (not shown in FIG. 1), and sets the control signals X1 and X2 in the DC-DC converter 21 to charge the storage battery 11. Control.
  • the detachable storage battery 11 When the detachable storage battery 11 is mounted, the process of supplying power from the storage battery 11 to the DC bus B described later is started, so that the operation efficiency of the power supply device 2 is increased.
  • the user instead of detecting that the storage battery 11 is attached to the power supply device 2, the user makes a predetermined input, presses a button, etc., and sets the control signals X 1 and X 2 in the DC-DC converter 21 to store the storage battery. You may perform the instruction
  • Step 2 The controller 14 charges the storage battery 11 until the voltage Vs reaches 400 V, which is the maximum voltage in the bus voltage range of the DC bus B. In this case, since the storage battery 11 discharges from the maximum voltage to the DC bus B as described later, it is possible to supply power for a long time.
  • the charging end point voltage is not limited to the maximum voltage, and may be a predetermined voltage higher than the minimum voltage 360 V of the bus voltage range in a predetermined bus voltage range of 360 V to 400 V of the DC bus B. . In that case, the maximum voltage after step 3 is read as a predetermined voltage.
  • Step 3 When the voltage Vs reaches the maximum voltage and charging of the storage battery 11 is completed, the controller 14 instructs the DC-DC converter 22 or the AC-DC converter 23 if the voltage Vb of the DC bus B is lower than the maximum voltage.
  • the control signals X1 and X2 are set so that the voltage Vb becomes the maximum voltage. If the time zone in which the storage battery 11 is mounted is a sunshine time zone, the controller 14 sets the control signals X1 and X2 in the DC-DC converter 20 to control the voltage Vb to be the maximum voltage. May be.
  • Completion of charging is determined by the constant current and constant voltage charging time when the charging current is very small in constant voltage charging after constant current charging, for example, when performing constant current constant voltage charging to a lithium ion battery. Can do. Completion of such charging can be appropriately determined by a known method applied to various storage batteries.
  • the voltage change of the storage battery 11 from step 1 to step 3 is shown in the portion of the curve c in FIG. 3 up to time t1.
  • Step 4 The controller 14 compares the voltage Vb and the voltage Vs, and if they are equal, the controller 14 controls the switch circuit 13 to be in a conducting state by the control signal s1. According to step 3, the storage battery 11 can be safely connected to the DC bus B via the switch circuit 13 by the controller 14. This state corresponds to the time t1 portion of the curve c in FIG.
  • Step 5 The control unit 14 performs control to stop the operating power of the DC-DC converters 20, 21, and 22 and the AC-DC converter 23 by the control signal s 2 while controlling the switch circuit 13 to be conductive.
  • the DC power supply means the operation of the AC-DC converter 23 is stopped.
  • the DC-DC converter for stopping the operation power supply is not limited to all the provided DC-DC converters, and may be a part of the DC-DC converters. It is only necessary to stop the operation power supply. However, since the switch circuit 13 is conductive, the operating power supply of the DC-DC converter 21 is always stopped.
  • the DC power supply means for stopping the operation the operation of the DC power supply means designated in advance may be stopped.
  • Step 6 When the voltage Vb drops to the minimum voltage 360V in the bus voltage range while the switch circuit 13 is conducting, the control unit 14 cuts off the switch circuit 13 by the control signal s1 and connects the storage battery 11 to the DC bus. Separate from B. This state corresponds to the time t2 portion of the curve c in FIG. Then, the control unit 14 turns on the operating power of the DC-DC converter 21 by the control signal s2 and is designated in advance among the DC power supply means including the DC-DC converters 20 and 22 and the AC-DC converter 23. Control to turn on the operating power. In this way, the control unit 14 performs control to charge the storage battery 11 by supplying power from the DC power supply means to the DC bus B. This state corresponds to a portion after time t2 of curve c in FIG.
  • Step 7 The control unit 14 again performs control to charge the storage battery 11 to the maximum voltage, and returns to step 3. Even if the voltage of the storage battery 11 drops to the minimum voltage by steps 6 and 7, it is charged again to the maximum voltage and power is supplied to the DC bus B. Therefore, the discharge from the storage battery 11 to the DC bus B can be repeated with the minimum necessary power consumption.
  • the power supply device 2 is conventionally operated by stopping the operation power supply of the DC-DC converter designated in advance at midnight or further stopping the operation of the DC power supply means designated in advance. Even midnight power consumption is reduced.
  • the power supply device 2 is provided with a DC-DC converter 20 between the solar power generation device 10 and the DC bus B.
  • the output voltage of the solar power generation device 10 is not equal to the bus voltage of the DC bus B.
  • the conventional DC-AC conversion is unnecessary, and the operating power supply of the DC-DC converter 20 can be stopped during the load suspension period, so that power consumption can be suppressed as much as possible.
  • the power supply from the AC distribution network can be stopped and the power consumption of the AC-DC converter can be reduced.
  • the power consumption becomes W1 at midnight, which is smaller than the power consumption W0 of FIG.
  • the load suspension time zone is other than midnight, it goes without saying that the power consumption is reduced by executing the above steps 1 to 7 in that time zone.
  • the power supply device 2 has been described above.
  • the power supply device 2 according to the present invention constituting the DC power supply system 1 functions effectively not only in a general home but also in a business office such as an office building or a factory.
  • the control unit monitors the voltage of the DC bus and the voltage of the first storage battery, and when the voltage of the DC bus and the voltage of the first storage battery are different, While the switch circuit is shut off, the voltage of the DC bus and the voltage of the first storage battery are larger than the minimum voltage of the bus voltage range and equal to each other in a predetermined bus voltage range of the DC bus. At some point, the switch circuit is controlled to conduct, The control unit performs control to stop the operating power supply of the DC / DC converting means designated in advance including the first DC-DC converter while controlling the switch circuit to be conductive. Also good.
  • control unit can safely connect the first storage battery to the DC bus via the switch circuit, and then stop the operation power supply of the DC / DC converting means designated in advance. There is an effect.
  • control unit may perform control to stop the operation of the DC power supply unit designated in advance while controlling the switch circuit to conduct. .
  • the predetermined voltage may be a maximum voltage in the bus voltage range.
  • the first storage battery discharges from the maximum voltage to the DC bus, there is an effect that electric power can be supplied for a long time.
  • the switch circuit In addition to shutting off, the operation power of the first DC-DC converter is turned on to supply power from the DC power supply means to the DC bus to charge the first storage battery to the predetermined voltage. You may go.
  • the first storage battery may be removable.
  • the first storage battery can be used for other purposes when the first storage battery is not used in the power supply device.
  • the first storage battery is detachable, and the control unit charges the first storage battery to the predetermined voltage when the first storage battery is attached.
  • the operation of the first DC-DC converter may be controlled, and when the first storage battery is charged to the predetermined voltage, the voltage of the DC bus may be controlled to the predetermined voltage.
  • the process of supplying power from the first storage battery to the DC bus is started, so that the operation efficiency of the power supply device is increased.
  • the first storage battery may be an in-vehicle battery.
  • the vehicle-mounted battery can be used at times other than when the vehicle is running, and there is an effect that utilization efficiency is increased.
  • the battery may be a battery for an electric vehicle.
  • the battery for an electric vehicle since the battery for an electric vehicle has high output and excellent charge / discharge characteristics, there is an effect that it is easily adapted to a power supply device.
  • the bus voltage range of the DC bus is within a predetermined operating voltage range of the DC device, and the DC bus and the predetermined DC device are the DC- It may be connected without going through the DC conversion means.
  • the DC device can be used by being directly connected to the DC bus, there is an effect that the power supply device can be simply configured.
  • the power supply device of the present invention may include a second storage battery having a chargeable voltage smaller than the bus voltage range of the DC bus as the power storage means.
  • the second storage battery is a low voltage storage battery, there is an effect that safety is high when used in a general home or in a limited space.
  • the control unit monitors the voltage of the DC bus and the voltage of the first storage battery, and shuts off the switch circuit when the voltage of the DC bus and the voltage of the first storage battery are different, while the DC bus
  • the switch circuit is made conductive.
  • Control The control unit performs control to stop the operating power supply of the DC / DC converting means designated in advance including the first DC-DC converter while controlling the switch circuit to be conductive. Also good.
  • power can be supplied from the first storage battery to the DC bus via the switch circuit by making the switch circuit conductive by the control unit. Therefore, it is possible to stop the operating power supply of the DC-DC converting means including the first DC-DC converter during a load suspension period such as midnight. Therefore, power consumption can be reduced by stopping the operating power supply of the DC-DC converting means.
  • control unit performs control to stop the operation of the DC power supply means designated in advance while controlling the switch circuit to be conductive. May be.
  • the predetermined voltage may be a maximum voltage in the bus voltage range.
  • the first storage battery discharges from the maximum voltage to the DC bus, there is an effect that electric power can be supplied for a long time.
  • control unit when the voltage of the DC bus drops to the minimum voltage in the bus voltage range while the switch circuit is conducting, The switch circuit is shut off and the operating power of the first DC-DC converter is turned on to supply power from the DC power supply means to the DC bus to charge the first storage battery to the predetermined voltage. Control may be performed.
  • the first storage battery is detachable, and the control unit, when the first storage battery is mounted, causes the first storage battery to reach the predetermined voltage.
  • the operation of the first DC-DC converter may be controlled so as to be charged, and the voltage of the DC bus may be controlled to the predetermined voltage when the first storage battery is charged to the predetermined voltage.
  • the process of supplying power from the first storage battery to the DC bus is started, so that the operation efficiency of the power supply device is increased.
  • the DC power supply system of the present invention may include an AC-DC converter that performs AC-DC conversion between the AC distribution network and the DC bus as the DC power supply means specified in advance. .
  • the DC power supply system of the present invention may include a solar power generation device as the DC power supply means.
  • the photovoltaic power generation apparatus can be suitably used for the DC power supply system without significantly reducing the utilization efficiency of the generated power.
  • the DC-DC conversion means may be provided between the solar power generation device and the DC bus.
  • the conventional DC-AC conversion is not required, and the DC-DC conversion means is used during the load suspension period. Since the operation power supply can be stopped, power consumption can be suppressed as much as possible.
  • the present invention can be suitably used for a microgrid.

Landscapes

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

Abstract

La présente invention concerne un dispositif d'alimentation en courant dans lequel est disposée comme moyen de stockage de courant (11, 12) une première batterie de stockage (11) présentant un premier convertisseur CC-CC (21) connecté entre un bus CC et la première batterie de stockage (11), et comprenant en outre : un circuit de commutateur (13) connecté en parallèle au premier convertisseur CC-CC (21) entre le bus CC (B) et la première batterie de stockage (11) ; et une unité de commande (14) exécutant une commande MARCHE/ARRET du circuit de commutateur (13).
PCT/JP2012/059604 2011-04-18 2012-04-06 Dispositif d'alimentation en courant, procédé de commande pour dispositif d'alimentation en courant et système d'alimentation en courant continu Ceased WO2012144358A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011091996A JP5290349B2 (ja) 2011-04-18 2011-04-18 直流給電システムおよびその制御方法
JP2011-091996 2011-04-18

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WO2012144358A1 true WO2012144358A1 (fr) 2012-10-26

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CN104309483A (zh) * 2014-09-02 2015-01-28 富华德电子有限公司 电动车用电源系统
WO2015059548A1 (fr) * 2013-10-22 2015-04-30 Toyota Jidosha Kabushiki Kaisha Dispositif de génération d'énergie solaire et procédé de commande d'un dispositif de génération d'énergie solaire
CN105556796A (zh) * 2013-09-19 2016-05-04 三菱重工业株式会社 充电设备和充电设备的能量管理方法
CN113285518A (zh) * 2021-04-12 2021-08-20 中广核研究院有限公司 直流电源系统
CN114498885A (zh) * 2021-12-22 2022-05-13 珠海格力电器股份有限公司 光伏储能变流器充放电控制电路和光伏设备
CN115459334A (zh) * 2022-10-20 2022-12-09 清华大学 农村光伏柔性直流配电网系统及方法

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JP6018521B2 (ja) * 2013-02-26 2016-11-02 株式会社デンソー 電力システム
JP6276506B2 (ja) * 2013-02-26 2018-02-07 株式会社デンソー 電力制御装置
JP6034728B2 (ja) * 2013-03-12 2016-11-30 株式会社デンソー 電力システム
JP2015080360A (ja) * 2013-10-18 2015-04-23 京セラ株式会社 電力制御装置
JP2015177603A (ja) * 2014-03-13 2015-10-05 株式会社東芝 モータ駆動用インバータ装置
JP2019115115A (ja) * 2017-12-21 2019-07-11 国立大学法人東北大学 蓄電機能を有する電力システム
JP7578016B2 (ja) * 2021-02-16 2024-11-06 トヨタ自動車株式会社 車載ソーラー充電制御システム、車載ソーラー充電制御方法及びプログラム
WO2023170860A1 (fr) * 2022-03-10 2023-09-14 三菱電機株式会社 Système de distribution d'énergie en courant continu

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CN104309483A (zh) * 2014-09-02 2015-01-28 富华德电子有限公司 电动车用电源系统
CN113285518A (zh) * 2021-04-12 2021-08-20 中广核研究院有限公司 直流电源系统
CN114498885A (zh) * 2021-12-22 2022-05-13 珠海格力电器股份有限公司 光伏储能变流器充放电控制电路和光伏设备
CN115459334A (zh) * 2022-10-20 2022-12-09 清华大学 农村光伏柔性直流配电网系统及方法

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