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WO2018142737A1 - Dispositif et système de conversion de puissance - Google Patents

Dispositif et système de conversion de puissance Download PDF

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Publication number
WO2018142737A1
WO2018142737A1 PCT/JP2017/042630 JP2017042630W WO2018142737A1 WO 2018142737 A1 WO2018142737 A1 WO 2018142737A1 JP 2017042630 W JP2017042630 W JP 2017042630W WO 2018142737 A1 WO2018142737 A1 WO 2018142737A1
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WO
WIPO (PCT)
Prior art keywords
power
control unit
converter
bus
outputs
Prior art date
Application number
PCT/JP2017/042630
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English (en)
Japanese (ja)
Inventor
直生 辻本
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2018142737A1 publication Critical patent/WO2018142737A1/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

Definitions

  • the present invention relates to a power conversion device that converts and outputs power supplied from a DC power source such as a solar battery, and a power conversion system.
  • an inverter that converts DC power generated by a solar cell into AC power is used. It is common to use power generated by stepping down DC power generated by a solar cell as a power source for an inverter (see, for example, Patent Document 1). Since a solar cell does not generate power in an environment where there is no solar radiation (for example, at night), there is basically no need to operate an inverter in that environment.
  • a system in which a photovoltaic power generation system and a power storage system are linked (hereinafter referred to as a “creation and cooperation system” in this specification) has become widespread.
  • a creation / storage cooperation system a DC-DC converter of a power storage system is generally connected to a bus on the DC side of an inverter.
  • the inverter may operate due to charging / discharging of the storage battery even when the solar battery is not generating power.
  • the power source of the inverter can be taken from an AC commercial power system (hereinafter simply referred to as a power system).
  • a power system AC commercial power system
  • the creation-saving cooperation system supports the self-sustained mode, and when the power system fails, the power discharged from the storage battery can be output independently. In order to switch to the self-supporting mode, it is necessary for the control unit that controls the storage battery to recognize a power failure in the power system.
  • an electricity storage system can be retrofitted to an existing photovoltaic power generation system.
  • the control unit of the separation-type power storage system is not equipped with a device for directly detecting a power failure in the power system. If a detector for detecting a power failure is added to the power storage system, the cost increases.
  • the present invention has been made in view of such a situation, and an object of the present invention is to provide a technology that enables a power conversion device that does not directly monitor the state of the power system to accurately recognize the presence or absence of a power outage of the power system at low cost. There is to do.
  • a power converter includes a first DC-DC that converts DC power output from a first DC power source into DC power having a desired voltage value and outputs the DC power to a DC bus.
  • a converter ; an inverter that converts the DC power of the DC bus into AC power and outputs the AC power to a power system; and a first control unit that controls the inverter.
  • the DC bus is connected to a second DC-DC converter that converts DC power output from a second DC power source into DC power having a desired voltage value and outputs the DC power to the DC bus
  • the first control unit includes: A signal line is connected to a second control unit that controls the second DC-DC converter, and a signal indicating whether or not the power system is out of power is output to the signal line.
  • a power conversion device that does not directly monitor the state of the power system can recognize the presence or absence of a power failure in the power system with low cost and high accuracy.
  • FIGS. 7A and 7B are diagrams illustrating circuit configuration examples in which power recovery cannot be detected.
  • FIG. 1 is a diagram for explaining a power conversion system 1 according to an embodiment of the present invention.
  • the power conversion system 1 includes a first power conversion device 10 and a second power conversion device 20.
  • the first power conversion device 10 is a power conditioner system for the solar cell 2
  • the second power conversion device 20 is a power conditioner system for the power storage unit 3.
  • FIG. 1 the example which retrofitted the power conditioner system for the electrical storage part 3 to the power conditioner system for the solar cells 2 is shown.
  • the solar cell 2 is a power generation device that directly converts light energy into electric power using the photovoltaic effect.
  • a silicon solar cell, a solar cell made of a compound semiconductor or the like, a dye-sensitized type (organic solar cell), or the like is used as the solar cell 2.
  • the solar cell 2 is connected to the first power conversion device 10 and outputs the generated power to the first power conversion device 10.
  • the first power conversion device 10 includes a first DC-DC converter 11, an inverter 12, a first power supply unit 13, and a first control unit 14.
  • the first DC-DC converter 11 and the inverter 12 are connected by a DC bus 15.
  • the first DC-DC converter 11 converts the DC power output from the solar cell 2 into DC power having a desired voltage value, and outputs the converted DC power to the DC bus 15.
  • the first DC-DC converter 11 can be constituted by a step-up chopper, for example.
  • the inverter 12 is a bidirectional inverter that converts DC power input from the DC bus 15 into AC power, and outputs the converted AC power to a distribution line connected to the power system 4.
  • a load 5 is connected to the distribution line.
  • the inverter 12 converts AC power supplied from the power system 4 into DC power, and outputs the converted DC power to the DC bus 15.
  • the first control unit 14 controls the first DC-DC converter 11 and the inverter 12.
  • the first control unit 14 controls the first DC-DC converter 11 so that the output power of the solar cell 2 is maximized.
  • the first control unit 14 measures the input voltage and input current of the first DC-DC converter 11, which are the output voltage and output current of the solar cell 2, and estimates the generated power of the solar cell 2.
  • the first control unit 14 generates a command value for setting the generated power of the solar cell 2 to the maximum power point (optimum operating point) based on the measured output voltage of the solar cell 2 and the estimated generated power.
  • the maximum power point is searched by changing the operating point voltage with a predetermined step width according to the hill-climbing method, and the command value is generated so as to maintain the maximum power point.
  • the first DC-DC converter 11 performs a switching operation according to a drive signal based on the generated command value.
  • the first control unit 14 controls the inverter 12 so that the voltage of the DC bus 15 maintains the target value. Specifically, the first control unit 14 detects the voltage of the DC bus 15 and generates a command value for making the detected bus voltage coincide with the target value. The inverter 12 performs a switching operation according to a drive signal based on the generated command value.
  • the first power supply unit 13 converts the AC power from the power system 4 into DC power having a desired low voltage value, and generates a control power supply voltage. For example, 202 ⁇ 20V AC voltage of the power system 4 is converted to 24V DC voltage (control power supply voltage).
  • the first power supply unit 13 converts the DC power from the DC bus 15 into DC power having a desired low voltage value to generate a control power supply voltage. For example, the DC voltage of 300 to 360 V on the DC bus 15 is stepped down to a DC voltage (control power supply voltage) of 24 V.
  • the first power supply unit 13 supplies the generated control power supply voltage to various loads in the system including the first control unit 14. The detailed configuration of the first power supply unit 13 will be described later.
  • the power storage unit 3 can charge and discharge electric power, and includes a lithium ion storage battery, a nickel hydride storage battery, a lead storage battery, an electric double layer capacitor, a lithium ion capacitor, and the like.
  • the power storage unit 3 is connected to the second power conversion device 20.
  • the second power conversion device 20 includes a second DC-DC converter 21, a second power supply unit 22, and a second control unit 23.
  • the second DC-DC converter 21 is a bidirectional converter that is connected between the power storage unit 3 and the DC bus 15 and charges and discharges the power storage unit 3.
  • the second control unit 23 controls the second DC-DC converter 21 based on the command value to charge / discharge the power storage unit 3 at a constant current (CC) / constant voltage (CV).
  • the second power supply unit 22 converts the DC power from the power storage unit 3 or the DC bus 15 into DC power having a desired low voltage value and generates a control power supply voltage.
  • the second power supply unit 223 supplies the generated control power supply voltage to various loads in the system including the second control unit 23.
  • the operation display unit 30 is a user interface of the power conversion system 1 and is installed at a predetermined position in the room.
  • the operation display unit 30 can be configured by, for example, a touch panel display, and provides predetermined information to the user and accepts an operation from the user.
  • the operation display unit 30 and the first control unit 14 are connected by a communication line 43, and a predetermined serial communication standard (for example, RS-485 standard, TCP-IP standard) is established between them. Compliant communication is performed.
  • the operation display unit 30 is connected to the first power supply unit 13 through a power supply line, and operates by receiving a control power supply voltage generated by the first power supply unit 13.
  • the operation display unit 30 may acquire a system voltage from an AC outlet and generate a control power supply voltage inside the operation display unit 30.
  • the operation display unit 30 may be a portable terminal that is not fixed to a wall or the like but may be carried. In this case, the operation display unit 30 and the first control unit 14 are connected by wireless communication.
  • the first control unit 14 and the second control unit 23 are connected by a communication line 41 and a power failure notification signal line 42. Communication conforming to a predetermined serial communication standard is also performed between the first control unit 14 and the second control unit 23.
  • the power failure notification signal line 42 is a dedicated signal line for notifying the power system 4 of the occurrence of a power failure from the first control unit 14 to the second control unit 23.
  • FIG. 2 is a diagram showing a detailed configuration between the inverter 12 and the power system 4 of FIG.
  • the power conversion system 1 supports a grid interconnection mode and an independent mode.
  • a grid interconnection relay S ⁇ b> 1 is inserted on the distribution line between the inverter 12 and the power system 4.
  • the first power supply unit 13 obtains AC power from the feed point on the power system 4 side from the grid interconnection relay S1.
  • a power line for self-sustained output branches from a connection point between the inverter 12 and the grid interconnection relay S ⁇ b> 1, and the power line is connected to the self-sustained output terminal 6.
  • a self-sustained output relay S2 is inserted on the power line.
  • An AC plug may be attached to the tip of the self-supporting output terminal 6, or a specific load set in advance may be connected.
  • the specific load is a preset load that can receive power supply from the power conversion system 1 preferentially at the time of a power failure of the power system 4.
  • the configuration shown in FIG. 2 is a configuration in which a general load 5 is connected to the outside of the grid interconnection relay S 1, so that power is not supplied from the power conversion system 1 to the load 5 in the self-sustained mode and is connected to the self-sustained output terminal 6 In this configuration, power is supplied only to the load that has been applied.
  • the 1st control part 14 can control opening and closing of the grid connection relay S1 by controlling energization / non-energization to the coil of the grid connection relay S1, and similarly energization / non-energization to the coil of the independent output relay S2 By controlling this, the opening and closing of the self-supporting output relay S2 can be controlled.
  • the contact In the case of a normally open type relay, the contact is closed by energizing the coil, and in the case of a normally closed type relay, the contact is opened by energizing the coil.
  • the first control unit 14 closes the grid connection relay S1 and opens the independent output relay S2 in the grid connection mode, and opens the grid connection relay S1 and closes the independent output relay S2 in the independent mode.
  • FIG. 3 is a diagram showing a detailed configuration of the first power supply unit 13 and the first control unit 14 of FIG.
  • the first power supply unit 13 includes an insulated AC-DC converter 13a, an insulated DC-DC converter 13b, and a voltage dividing circuit.
  • the first control unit 14 includes a step-down circuit 14a, a first microcomputer 14b, a transistor Q1, and a first photocoupler P1.
  • the insulated AC-DC converter 13a and the insulated DC-DC converter 13b are each composed of, for example, a flyback converter or a forward converter.
  • a rectifier circuit for example, a diode bridge circuit
  • the voltage dividing circuit is composed of a series circuit of a first resistor R1 and a second resistor R2, and divides the output voltage of the insulation type AC-DC converter 13a at a predetermined voltage dividing ratio (for example, approximately 2: 1).
  • the voltage at the voltage dividing point between the first resistor R1 and the second resistor R2 is input to the A / D port of the first microcomputer 14b.
  • the insulation type AC-DC converter 13a converts AC power supplied from the power system 4 into 12V DC power, and reduces the internal load 7 and step-down voltage via the first diode D1 and the second diode D2 for backflow prevention. Output to the circuit 14a.
  • the system load 7 includes loads such as the operation display unit 30 and a fan.
  • the fan is a fan for cooling a circuit board in the system.
  • the isolated DC-DC converter 13b converts DC power supplied from the DC bus 15 into 12V DC power, and loads the system load via the third diode D3 and the fourth diode D4 for backflow prevention. 7 and the step-down circuit 14a.
  • the step-down circuit 14a converts the DC power supplied from the isolated AC-DC converter 13a and / or the isolated DC-DC converter 13b into DC power having a desired low voltage value. In the example shown in FIG. 3, 12V DC power is converted to 5V DC power.
  • the step-down circuit 14a is configured by a switching regulator, for example.
  • the step-down circuit 14a outputs the stepped-down voltage to the power supply terminal VDD of the first microcomputer 14b and to one end of the transistor Q1. The other end of the transistor Q1 is connected to the ground line via the first photocoupler P1.
  • an npn bipolar transistor is used as the transistor Q1.
  • the other end of the collector of the transistor Q1 is connected to the power supply line (5V line), the other end of the emitter is connected to the ground line, and the base terminal is connected to the I / O port of the first microcomputer 14b.
  • An FET may be used instead of the bipolar transistor.
  • the photodiode of the first photocoupler P1 is inserted between the emitter terminal of the transistor Q1 and the ground line, and the phototransistor of the first photocoupler P1 is connected to the power failure notification signal line 42.
  • the first microcomputer 14b monitors the voltage input to the A / D port and estimates the output voltage of the isolated AC-DC converter 13a.
  • a power supply voltage line is connected to the wiring between the voltage dividing point and the A / D port via a fifth diode D5, and a ground line is connected to the A / D port via a sixth diode D6. The input of abnormal voltages such as is suppressed.
  • the first microcomputer 14b operates exclusively using AC power from the power system 4 as an energy source. For example, at night when the electricity bill is cheap, the power storage unit 3 is often charged and the solar cell 2 is stopped.
  • the first microcomputer 14b monitors the output voltage of the isolated AC-DC converter 13a by the A / D port.
  • the first microcomputer 14b determines that the power system 4 has failed when the output voltage of the isolated AC-DC converter 13a falls below a predetermined threshold voltage Vth.
  • the first microcomputer 14b detects a power failure, the first microcomputer 14b passes a current of a predetermined value or more from the I / O port to the base terminal of the transistor Q1, thereby turning on the transistor Q1.
  • FIG. 4 is a diagram illustrating a control example of the power failure notification signal line 42.
  • the power failure notification signal line 42 indicates whether or not a power failure has occurred in the power system 4 from the first microcomputer 14b of the first control unit 14 to the second microcomputer 23b of the second control unit 23 (high level, low level). This is a signal line for notification.
  • a high level indicates a normal state where the power system 4 is not out of power
  • a low level indicates a state where the power system 4 is out of power.
  • the first microcomputer 14b of the first control unit 14 and the second microcomputer 23b of the second control unit 23 are insulated by the first photocoupler P1 and the second photocoupler P2.
  • the phototransistor of the first photocoupler P1 outputs a high level (power supply voltage) when the photodiode is not conductive, and outputs a low level (ground voltage) when the photodiode is conductive.
  • the first microcomputer 14b When the first microcomputer 14b detects a power failure, the first microcomputer 14b turns off the transistor Q1, so that the photodiode becomes conductive.
  • the second photocoupler P2 inverts the level of the power failure notification signal line 42 and inputs a signal to the I / O port of the second microcomputer 23b. Note that the relationship between the high level and the low level may be designed opposite to that shown in FIG.
  • FIG. 5 is a diagram showing a transition example of the output voltage of the isolated AC-DC converter 13a at the time of a power failure of the power system 4.
  • the step-down circuit 14a (switching regulator) stops oscillation and stops output when the voltage drops to the undervoltage lockout voltage UVLO.
  • the step-down circuit 14a in which the undervoltage lockout voltage UVLO is set to 7.5V is used.
  • the step-down circuit 14a stops outputting, and the first microcomputer 14b loses power and stops its operation. Therefore, after the power failure occurs, the first microcomputer 14b needs to turn off the transistor Q1 before the power is lost.
  • the power consumption P of the system load 7 and the first control unit 14 at night can be estimated to be about 9 W. Therefore, the load Z connected to the output 12V line of the insulation type AC-DC converter 13a can be estimated by the following equation (1).
  • the time T during which the output voltage of the isolated AC-DC converter 13a to which a 16 ⁇ load is connected decreases from 12V to 7.5V can be estimated by the following equation (2).
  • C is the capacity of the electrolytic capacitor on the secondary side of the insulated AC-DC converter 13a.
  • the time T that decreases from 9V at the time of detecting the power failure to 7.5V can be estimated by the following equation (3).
  • the first microcomputer 14b has a grace period of about 4 msec from the detection of the power failure until the operation stops, and the transistor Q1 is turned off within the period to notify the second microcomputer 23b of the occurrence of the power failure. can do.
  • FIG. 6 is a flowchart showing the operation of the power conversion system 1 according to the embodiment of the present invention when a power failure occurs.
  • the first control unit 14 detects a power failure in the power system 4 based on a decrease in the output voltage of the isolated AC-DC converter 13a (S10).
  • the first control unit 14 notifies the second control unit 23 of the occurrence of a power failure by inverting the level of the power failure notification signal line 42 (S11).
  • at least one of the first controller 14 and the second controller 23 may record log information indicating that the power system 4 has failed in a non-illustrated nonvolatile memory. Thereafter, the first power supply unit 13 and the first control unit 14 are stopped.
  • the 2nd control part 23 which received the notice of the occurrence of a power failure changes the 2nd power converter 20 into self-supporting mode, and stands by (S12).
  • the second control unit 23 detects the voltage of the DC bus 15 and determines whether the bus voltage is equal to or lower than a specified voltage (for example, 80 V) (S13). When the bus voltage is equal to or lower than the specified voltage (Y in S13), the second control unit 23 starts discharging from the power storage unit 3 to the DC bus 15 (S14). If the bus voltage is not less than the specified voltage (N in S13), the process waits until the bus voltage drops below the specified voltage (S12).
  • a specified voltage for example, 80 V
  • the first power supply unit 13 is restarted (S15).
  • the first control unit 14 and the operation display unit 30 are restarted by the control power supply voltage of the restarted first power supply unit 13 (S16).
  • the first control unit 14 causes the operation display unit 30 to display a message for allowing the user to select whether to start in the self-supporting mode (S17).
  • the presence or absence of the input voltage of the first DC / DC converter no input voltage: the first power supply unit 13 is activated by the discharge from the storage battery
  • the presence / absence of current flowing from the second DC / DC converter to the DC bus current present: it can be determined that the first power supply unit 13 has been started by discharging from the storage battery. Note that other methods may be used.
  • the first control unit 14 activates the first power converter 10 in the autonomous mode (S19).
  • the first power conversion device 10 remains stopped. If the setting does not require the user's selection operation, the process of step S18 is skipped.
  • the second power conversion device 20 does not need to include a sensor that directly detects a power failure of the power system 4, and can reduce the cost of the second power conversion device 20. .
  • the first microcomputer 14b can record log information of power failure detection.
  • the power failure notification signal line 42 provided separately from the communication line 41 is transmitted from the first microcomputer 14b to the second microcomputer 23b using a binary level signal.
  • a binary level signal As a result, high-speed communication becomes possible, and it is possible to prevent the power source of the insulated DC-DC converter 13b from being lost before the notification to the second microcomputer 23b is completed. Therefore, a highly reliable power failure notification system can be constructed.
  • the normal communication line 41 is used, a predetermined communication procedure is required and it takes time.
  • the insulation between the insulation type AC-DC converter 13a and the first microcomputer 14b becomes unnecessary, and the circuit configuration can be simplified. Since the insulated AC-DC converter 13a includes a transformer, it is not necessary to further insulate.
  • power recovery of the power system 4 can be detected.
  • conventional circuit configurations there is a configuration in which a power recovery of the power system 4 cannot be detected after switching to the self-sustaining mode due to a power failure of the power system 4.
  • FIGS. 7A and 7 (b) are diagrams showing circuit configuration examples in which power recovery cannot be detected.
  • the C contact type system / independent switching relay S3 connects the input terminal of the voltage detection sensor 8 between the system interconnection line and the independent output line. It is configured to switch selectively.
  • the system / independent switching relay S3 connects the independent output line and the voltage detection sensor, and the voltage of the system interconnection line connected to the power system 4 cannot be detected. ing.
  • the output voltage of the insulation type AC-DC converter 13a in the first power supply unit 13 is monitored, it is possible to monitor the voltage of the grid connection line even in the independent mode. it can.
  • the solar cell 2 was mentioned as an example as DC power supply connected to the 1st power converter device 10, what is necessary is just a power supply with a possibility that an output may stop, an electrical storage part, a fuel cell, A wind power generator or a micro hydroelectric generator may be used. In the case of a wind power generator or a micro hydroelectric generator, it is necessary to replace the first DC-DC converter 11 with an AC-DC converter.
  • the power storage unit 3 is taken as an example of the DC power source connected to the second power conversion device 20, any power source capable of controlling the output may be used, and a fuel cell may be used.
  • a first DC-DC converter (11) for converting DC power output from the first DC power source (2) into DC power having a desired voltage value and outputting the DC power to the DC bus (15);
  • An inverter (12) for converting the DC power of the DC bus (15) into AC power and outputting the AC power to a power system (4);
  • a first control unit (14) for controlling the inverter (12),
  • the DC bus (15) includes a second DC-DC converter (21) that converts DC power output from the second DC power source (3) into DC power having a desired voltage value and outputs the DC power to the DC bus (15).
  • the first control unit (14) is connected to the second control unit (23) for controlling the second DC-DC converter (21) through a signal line (42), and the power system (4) is interrupted.
  • the 2nd control part (23) can recognize the occurrence of a power failure of electric power system (4) with high accuracy, suppressing cost.
  • the signal line (42) is a dedicated signal line (42) for transmitting a binary signal indicating whether or not the power system (4) is out of power.
  • Device (10) is a dedicated signal line (42) for transmitting a binary signal indicating whether or not the power system (4) is out of power.
  • a power supply unit (13) that converts AC power of the power system (4) into DC power for operating the first control unit (14) and supplies the converted DC power to the first control unit (14).
  • the first control unit (14) outputs a signal indicating that the power system (14) is out of power when the voltage of the DC power supplied from the power supply unit (13) is lower than a predetermined value.
  • the power conversion device (10) according to item 1 or 2, wherein the power conversion device (10) outputs to a signal line (42).
  • At least one of the first control unit (14) and the second control unit (23) reaches the predetermined value after the voltage of the DC power supplied from the power supply unit (13) falls below a detection threshold.
  • the power conversion device (10) according to item 3, wherein log information indicating that the power system (4) has failed is recorded. According to this, the 1st control part (14) can leave the log of a power failure.
  • the power supply unit (13) converts the DC power of the DC bus (15) into DC power for operating the first control unit (14), and the converted DC power is converted into the first control unit (14).
  • the power conversion device (10) according to item 3 or 4 characterized in that the power conversion device (10) can be supplied to the power conversion device. According to this, the first control unit (14) can be operated even during a power failure of the power system (4).
  • the inverter (12) supplies AC power to the power system (4) via a switch (S1),
  • the power converter (10) according to item 5 acquires AC power from the power supply point on the power system (4) side from the switch (S1). According to this, it is possible to detect power recovery of the power system (4).
  • the first DC power source (2) is a solar cell (2);
  • the second DC power supply (3) is a power storage unit (3),
  • the inverter (12) is capable of converting AC power of the power system (4) into DC power and outputting it to the DC bus (15).
  • the second DC-DC converter (21) can convert the DC power output from the DC bus (15) into DC power having a desired voltage value and output the DC power to the power storage unit (3).
  • the power conversion device (10) according to any one of items 1 to 6, characterized by: According to this, even when the power system (4) has a power failure while the solar cell (2) is not generating power, the first control unit (14) can be operated by the power of the power storage unit (3).
  • the second DC power supply (3) is a power storage unit (3), When the second control unit (23) receives a signal from the signal line (42) indicating that the power system (4) is out of power, the power storage unit (3) to the DC bus (15).
  • the power conversion device (20) according to item 9, wherein the second DC-DC converter (21) is controlled to discharge. According to this, the power supply unit (13) can acquire power from the DC bus (15).
  • a first power conversion device having an inverter (12) that converts DC power into AC power and outputs front AC power to the front power system, and a first control unit (14) that controls the inverter (12) ( 10) and A second DC-DC converter (21) for converting DC power output from the second DC power source (3) into DC power having a desired voltage value and outputting the DC power to the DC bus (15); and the second DC-DC converter
  • the first control unit (14) is connected to the second control unit (13) by a signal line (42), and a signal indicating whether or not the power system (4) has a power failure is transmitted to the signal line.
  • the power conversion system (1) characterized by outputting to (42). According to this, the 2nd control part (23) can recognize the occurrence of
  • SYMBOLS 1 Power conversion system 2 Solar cell, 3 Power storage part, 4 Power system, 5 Load, 6 Self-sustained output terminal, 7 Load in system, 8 Voltage detection sensor, 10 1st power converter, 11 1st DC-DC converter, 12 Inverter, 13 first power supply unit, 13a isolated AC-DC converter, 13b isolated DC-DC converter, 14 first control unit, 14a step-down circuit, 14b first microcomputer, P1 first photocoupler, 15 DC bus, 20 Second power conversion device, 21 Second DC-DC converter, 22 Second power supply unit, 23 Second control unit, 30 Operation display unit, 41 Communication line, 42 Power failure notification signal line, 43 Communication line, S1 grid interconnection relay , S2, independent output relay, S3 system / independent switching relay, R1 first resistor, R2 second resistor, D1 first diode, D2 second diode, D3 third diode, D4 fourth diode, D5 fifth diode, D6 sixth diode, Q1 transistor, 23b
  • the present invention can be used for a system in which a photovoltaic power generation system and a power storage system are linked.

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

Abstract

Selon l'invention, dans un premier dispositif de conversion de puissance (10), un premier convertisseur CC-CC (11) convertit une puissance CC fournie par une première source d'alimentation CC en une puissance CC d'une valeur de tension souhaitée, et fournit le résultat à un bus CC (15). Un onduleur (12) convertit la puissance CC du bus CC (15) en une puissance CA et fournit cette dernière ainsi convertie à un système d'alimentation (4). Une première unité de commande (14) commande l'onduleur (12). Un second convertisseur CC-CC (21) connecté au bus CC (15) convertit une puissance CC fournie par une seconde source d'alimentation CC en une puissance CC d'une valeur de tension souhaitée et fournit cette dernière au bus CC (15). La première unité de commande (14) est connectée par l'intermédiaire d'une ligne de signal à une unité de commande (23) qui commande le second convertisseur CC-CC (21) et qui fournit à la ligne de signal un signal indiquant si le système d'alimentation (4) est alimenté ou non.
PCT/JP2017/042630 2017-02-02 2017-11-28 Dispositif et système de conversion de puissance WO2018142737A1 (fr)

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JP2017017923A JP6830193B2 (ja) 2017-02-02 2017-02-02 電力変換装置、電力変換システム
JP2017-017923 2017-02-02

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JP7643922B2 (ja) 2021-04-26 2025-03-11 株式会社Ｇｓユアサ 蓄電装置、蓄電方法および発電システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008054473A (ja) * 2006-08-28 2008-03-06 Sharp Corp 蓄電機能を有するパワーコンディショナ
JP2012161189A (ja) * 2011-02-01 2012-08-23 Tabuchi Electric Co Ltd 蓄電池への太陽電池電力の充放電制御方法
WO2013015097A1 (fr) * 2011-07-22 2013-01-31 三洋電機株式会社 Système de stockage d'électricité et système d'interconnexion de systèmes utilisant celui-ci
JP2014128164A (ja) * 2012-12-27 2014-07-07 Noritz Corp パワーコンディショナ及び太陽光発電システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008054473A (ja) * 2006-08-28 2008-03-06 Sharp Corp 蓄電機能を有するパワーコンディショナ
JP2012161189A (ja) * 2011-02-01 2012-08-23 Tabuchi Electric Co Ltd 蓄電池への太陽電池電力の充放電制御方法
WO2013015097A1 (fr) * 2011-07-22 2013-01-31 三洋電機株式会社 Système de stockage d'électricité et système d'interconnexion de systèmes utilisant celui-ci
JP2014128164A (ja) * 2012-12-27 2014-07-07 Noritz Corp パワーコンディショナ及び太陽光発電システム

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