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WO2018180889A1 - Dispositif de conversion de courant, système de conversion de courant, et dispositif d'alimentation en courant continu - Google Patents

Dispositif de conversion de courant, système de conversion de courant, et dispositif d'alimentation en courant continu Download PDF

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Publication number
WO2018180889A1
WO2018180889A1 PCT/JP2018/011409 JP2018011409W WO2018180889A1 WO 2018180889 A1 WO2018180889 A1 WO 2018180889A1 JP 2018011409 W JP2018011409 W JP 2018011409W WO 2018180889 A1 WO2018180889 A1 WO 2018180889A1
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WIPO (PCT)
Prior art keywords
power
power supply
supply device
converter
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/011409
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English (en)
Japanese (ja)
Inventor
藤井　裕之
渉 堀尾
菊池　彰洋
賢治 花村
智規 伊藤
康太 前場
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of WO2018180889A1 publication Critical patent/WO2018180889A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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

  • the present disclosure relates to a power conversion device, a power conversion system, and a DC power supply device, and more particularly, to a power conversion device, a power conversion system, and a DC power supply device that convert DC to AC.
  • the power conditioner includes a DC / DC converter that boosts or lowers the voltage of power output from the distributed power supply, an inverter that converts the output of the DC / DC converter into alternating current, a power conditioner that controls the output of the DC / DC converter and the inverter.
  • a control unit A system and a load are connected to the output end of the inverter, and the inverter is connected to the system and supplies power to the load.
  • the additional unit includes a DC / DC converter that boosts or lowers the voltage of power output from the additional distributed power supply, and an additional control unit that controls the DC / DC converter.
  • the output terminal of the DC / DC converter of the additional unit is electrically connected to a DC intermediate link portion that is a connection point between the DC / DC converter and the inverter in the power conditioner.
  • the power control unit monitors the voltage of the DC intermediate link portion, and performs PWM (Pulse Width Modulation) control of the power conditioner and the DC / DC converter of the additional unit based on the monitoring result.
  • PWM Pulse Width Modulation
  • the additional power source connected to the additional unit may be a power source that does not allow reverse power flow to the system (for example, a storage battery).
  • the additional control unit performs control to limit the output of the DC / DC converter so that a reverse power flow to the system does not occur in the entire power control system.
  • the additional control unit performs control to alleviate the discharge of the storage battery within the range where no reverse power flow to the grid occurs in the entire power control system. The output of the DC / DC converter is controlled so that the state does not always continue.
  • the inverter of the inverter is connected to the grid, but the additional unit is connected to the DC intermediate link part of the inverter. Therefore, there is a high possibility that the distance between the current sensor and the additional unit is longer than the distance between the current sensor and the power conditioner for detecting the reverse flow power to the system. Therefore, it takes time to wire the wire connecting the current sensor for detecting the reverse power flow to the system and the additional control unit, and the installation position of the additional unit is restricted by the wiring route of the wire. There was a problem.
  • An object of the present disclosure is to provide a power conversion device, a power conversion system, and a DC power supply device that can increase the degree of freedom of the installation location of the DC power supply device.
  • a power conversion device includes an inverter circuit that converts the DC power input from a DC line connected to a DC power supply device that outputs DC power into AC power and outputs the AC power to an AC power system, and And a control circuit for controlling the inverter circuit.
  • the control circuit transmits power information to the DC power supply device by communication.
  • the power information includes at least one of a tidal power flowing bidirectionally with the AC power system and a target value of an output of the DC power supply device according to the tidal power.
  • a power conversion system includes the power conversion device and the DC power supply device that outputs the DC power to the DC line of the power conversion device.
  • the DC power supply device includes a first connection unit, a second connection unit, a converter circuit, a reception unit, and a converter control unit.
  • the first connection unit is connected to a DC power source.
  • the second connection unit is connected to the DC line of the power converter that converts DC power input from the DC line into AC power and outputs the AC power to the AC power system.
  • the converter circuit converts a voltage value of a DC voltage between the first connection portion and the second connection portion.
  • the receiving unit communicates power information including at least one of a tidal power flowing bidirectionally with the AC power system and a target value of an output of the converter circuit corresponding to the tidal power from the power converter.
  • Receive The converter control unit controls the converter circuit based on the power information received by the receiving unit.
  • FIG. 1 is a system configuration diagram of a power conversion system according to an embodiment of the present disclosure.
  • FIG. 2 is a system configuration diagram of a power conversion system according to Modification 1 of the embodiment of the present disclosure.
  • FIG. 1 is a system configuration diagram of a power conversion system 1 according to the present embodiment.
  • the power conversion system 1 of the present embodiment is provided in a customer facility 10 where a solar power generation device 11 is installed as a power generation device.
  • the power conversion system 1 is connected to the AC power system 100 and supplies power to the load 5 connected to the AC power system 100 in the customer facility 10.
  • the power conversion system 1 outputs the surplus generated power to the AC power system 100 (reverse power flow) when the generated power generated by the solar power generation device 11 exceeds the power consumption of the load 5.
  • the customer facility 10 is a facility of a customer who receives supply of energy resources from an energy resource supplier. In the present embodiment, a detached house will be described as an example of the customer facility 10.
  • the power conversion system 1 includes a DC power supply device 3 that is electrically connected to the DC line DC1 of the power conversion device 2, and a power conversion device 2 that converts DC power input from the DC line DC1 into AC power. .
  • a storage battery unit 12 is connected to the DC power supply device 3.
  • the DC power supply device 3 converts the voltage value of the DC voltage input from the storage battery unit 12 at the time of discharging and outputs the converted voltage value to the DC line DC1. Further, the DC power supply device 3 converts the voltage value of the DC voltage input from the DC line DC1 and outputs it to the storage battery unit 12, that is, charges the storage battery unit 12.
  • the power converter 2 converts the DC voltage value input from the solar power generator 11 and outputs the DC voltage to the DC line DC1, and the DC line DC1. And a DC / AC converter 22 that converts the DC power to be converted into AC power.
  • the DC / DC converter 21 includes a first converter circuit 211 (a converter circuit of a power conversion device), a first control processing unit 212 (a converter control unit of a power conversion device), and a first measurement unit 213.
  • the first converter circuit 211 includes, for example, a step-up chopper circuit, converts the DC voltage input from the solar power generator 11 into a DC voltage having a predetermined voltage value (for example, DC 300 V), and outputs the DC voltage to the DC line DC1.
  • the switching element of the first converter circuit 211 is PWM-controlled by a control signal (PWM signal) input from the first control processing unit 212.
  • the first converter circuit 211 may be a conversion circuit that converts a voltage value of a DC voltage, and may be a step-down type or a step-up / down type chopper circuit.
  • the first measurement unit 213 includes, for example, a current sensor (for example, a Hall element, a resistor for current detection) for detecting an output current output from the first converter circuit 211 to the DC line DC1.
  • the first measuring unit 213 measures the output current of the first converter circuit 211 at a predetermined sampling interval (for example, a time interval of several mS).
  • the first control processing unit 212 includes, for example, a microcomputer having a CPU (Central Processing Unit) and a memory.
  • the function of the first control processing unit 212 is realized by the CPU executing the program stored in the memory.
  • the program executed by the CPU is stored in advance in a memory of a microcomputer, for example, but may be provided through an electric communication line such as the Internet or may be provided by being recorded on a recording medium such as a memory card. .
  • the first control processing unit 212 controls the output of the first converter circuit 211 based on the power information input from the system management unit 223.
  • the power information input from the system management unit 223 is a target value of the output current of the first converter circuit 211 determined by the system management unit 223, for example.
  • the first control processing unit 212 performs PWM control of the switching element included in the first converter circuit 211 so that the output current of the first converter circuit 211 matches the target value of the output current that is power information. (PWM signal) is output to the first converter circuit 211.
  • the first control processing unit 212 obtains an output current based on the measurement result of the first measurement unit 213, and outputs a control signal for performing PWM control so that the output current matches the target value to the first converter. The operation is repeated at predetermined time intervals.
  • the power information is input from the system management unit 223 to the first control processing unit 212 at a predetermined time interval (for example, 100 mS interval), and the first control processing unit 212 uses the first converter circuit 211 for this time interval. Longer than the time interval for outputting the control signal. In other words, the time interval at which the first control processing unit 212 outputs a control signal to the first converter circuit 211 is shorter than the time interval at which power information is input from the system management unit 223 to the first control processing unit 212. Therefore, the first control processing unit 212 can control the output of the first converter circuit 211 at a time interval shorter than the time interval at which the power information is input, and the control responsiveness is improved.
  • a predetermined time interval for example, 100 mS interval
  • the time interval at which the power information is input from the system management unit 223 to the first control processing unit 212 is longer than the time interval at which the first control processing unit 212 outputs the control signal to the first converter circuit 211.
  • the communication traffic can be reduced by reducing the number of transmissions of power information.
  • the DC / AC converter 22 includes an inverter circuit 220 and an inverter control circuit (hereinafter referred to as “control circuit”) 221.
  • the inverter circuit 220 is, for example, a full bridge type inverter circuit, and converts DC power input from the DC line DC1 into AC power.
  • the inverter circuit 220 performs at least one of an operation of connecting AC power to the AC power system 100 and supplying AC power to the load 5 and an operation of outputting AC power to the AC power system 100.
  • the inverter circuit 220 is not limited to a full bridge type inverter circuit, and may be a half bridge type inverter circuit.
  • the control circuit 221 includes an inverter control processing unit 222 and a system management unit 223.
  • the control circuit 221 controls the inverter circuit 220 as a whole.
  • the inverter control processing unit 222 controls the output of the inverter circuit 220 based on the control signal input from the system management unit 223.
  • the inverter control processing unit 222 includes a microcomputer having a CPU and a memory.
  • the function of the inverter control processing unit 222 is realized by the CPU executing a program stored in the memory.
  • the program executed by the CPU is stored in advance in a memory of a microcomputer, for example, but may be provided through an electric communication line such as the Internet or may be provided by being recorded on a recording medium such as a memory card. .
  • the system management unit 223 performs overall control of the power conversion system 1.
  • the system management unit 223 controls operations of the first converter circuit 211, the inverter circuit 220, and the second converter circuit 31 (the converter circuit of the DC power supply device) included in the DC power supply device 3.
  • the system management unit 223 includes, for example, a microcomputer having a CPU and a memory.
  • the function of the system management unit 223 is realized by the CPU executing a program stored in the memory.
  • the program executed by the CPU is stored in advance in a memory of a microcomputer, for example, but may be provided through an electric communication line such as the Internet or may be provided by being recorded on a recording medium such as a memory card.
  • the system management unit 223 and the inverter control processing unit 222 may be realized by a single microcomputer.
  • system management unit 223 includes a communication unit 224, a measurement unit 225, and a control command unit 226.
  • the communication unit 224 communicates with the DC power supply device 3 by wireless communication.
  • the communication unit 224 includes a low-power wireless communication module that does not require a wireless station license.
  • specifications such as the frequency band to be used and the antenna power are defined in each country depending on the application. In Japan, low power radio (specific low power radio) using radio waves such as 920 MHz band, 420 MHz band, 2.4 GHz band, and 5 GHz band is defined.
  • the communication unit 224 is not limited to a low-power wireless communication interface, and can be changed as appropriate.
  • the communication unit 224 may be, for example, a communication interface compliant with the ZigBee (registered trademark) standard, a communication interface compliant with the Bluetooth (registered trademark) standard, or the like.
  • the communication unit 224 also has a function of communicating with the first control processing unit 212 of the DC / DC converter 21. Communication between the communication unit 224 and the first control processing unit 212 may be wired or wireless.
  • the measurement unit 225 uses the current sensor 227 to measure the current I1 flowing through the electric path connecting the AC power system 100 and the power converter 2.
  • the current sensor 227 is a current transformer, a Hall element, or the like.
  • the customer facility 10 is provided with power receiving equipment such as a distribution board for storing a main breaker and a branch breaker, and a load 5 is connected to a branch circuit branched by the branch breaker.
  • the current sensor 227 measures the current I1 flowing through the electric path connecting the AC power system 100 and the power receiving facility, and measures the current I1 on the AC power system 100 side with respect to the power receiving facility.
  • the tidal power forward power, reverse power
  • the control command unit 226 Based on the polarity of the current I1 measured by the measuring unit 225, the control command unit 226 outputs power to the AC power system 100 in a state where power is being input from the AC power system 100 (power purchase state). It is judged whether it is in a state (power sale state). Then, the control command unit 226 obtains input power from the AC power system 100 based on the current value of the current I1 in the power purchase state, and AC based on the current value of the current I1 in the power sale state. The output power to the power system 100 is obtained.
  • the power flowing from the AC power system 100 to the customer facility 10 is referred to as “forward power flow”
  • the power flowing from the customer facility 10 to the AC power system 100 is referred to as “reverse power flow power”.
  • the tidal current power is power that flows in both directions without the direction of power movement between the AC power system 100 and the customer facility 10 being fixed in one direction.
  • the tidal power when flowing from the AC power system 100 to the customer facility 10 is forward power
  • the tidal power when flowing from the customer facility 10 to the AC power system 100 is reverse power.
  • the power purchase state is a state in which power is input from the AC power system 100. For example, the total of the generated power of the solar power generation device 11 and the power supplied from the storage battery unit 12 is consumed by the load 5. The power is in excess.
  • the power sale state is a state in which power is output to the AC power system 100, for example, a state in which the generated power of the solar power generation device 11 exceeds the power consumption of the load 5.
  • the control command unit 226 sends power information for instructing the first control processing unit 212 of the DC / DC converter 21 to output power corresponding to the generated power of the solar power generation device 11 from the communication unit 224. It transmits to the 1st control processing part 212 by communication.
  • control command unit 226 determines power information to be output to the DC power supply device 3 connected to the storage battery unit 12 depending on whether the power purchase state or the power sale state, and this power information is transmitted from the communication unit 224. It transmits to DC power supply device 3 by communication.
  • the operation unit 4 such as a dip switch is connected to the system management unit 223, and data corresponding to the on / off of the switch is input to the system management unit 223.
  • the DC power supply device 3 includes a first connection unit 301, a second connection unit 302, a second converter circuit 31 (a converter circuit of the DC power supply device 3), and a second control processing unit 32. (Converter control unit of DC power supply device 3), second measurement unit 33, and communication unit 34 (reception unit).
  • the DC power supply device 3 is a charge / discharge device that charges or discharges the storage battery unit 12.
  • the 1st connection part 301 is connected to the storage battery unit 12 which is DC power supply.
  • the second connection unit 302 is electrically connected to the DC line DC1 of the power conversion device 2 via the electric wire 6.
  • the second converter circuit 31 is, for example, a step-up / step-down bidirectional converter circuit, and converts a DC voltage value between the first connection unit 301 and the second connection unit 302.
  • the operation of the second converter circuit 31 is controlled by a control signal (PWM signal) input from the second control processing unit 32.
  • PWM signal a control signal
  • the second converter circuit 31 converts (boosts) the DC voltage value input from the storage battery unit 12 to a predetermined voltage value, and outputs the voltage value to the DC line DC ⁇ b> 1 via the electric wire 6.
  • the second converter circuit 31 converts (steps down) a DC voltage value input from the DC line DC ⁇ b> 1 via the electric wire 6 and outputs the voltage to the storage battery unit 12, that is, the storage battery unit 12. Charge.
  • the second measurement unit 33 includes, for example, a current sensor (for example, a hall element, a current detection resistor, etc.) provided in an electric circuit that connects the second converter circuit 31 and the second connection unit 302. .
  • the second measuring unit 33 measures the output current or the input current of the second converter circuit 31 at a predetermined sampling interval (for example, a time interval of several mS).
  • the communication unit 34 communicates with the communication unit 224 of the power conversion device 2 by wireless communication.
  • the communication unit 34 receives power information transmitted from the power conversion device 2.
  • the power information is, for example, the target of the output current or input current of the second converter circuit 31 (output current to the DC line DC1 when the storage battery unit 12 is discharged, and input current from the DC line DC1 when the storage battery unit 12 is charged). Value.
  • the communication unit 34 includes a communication module having the same communication method as that of the communication unit 224 of the power conversion device 2, and performs communication with the communication unit 224 by wireless communication.
  • the second control processing unit 32 controls the output of the second converter circuit 31.
  • the second control processing unit 32 includes, for example, a microcomputer having a CPU and a memory.
  • the function of the second control processing unit 32 is realized by the CPU executing the program stored in the memory.
  • the program executed by the CPU is stored in advance in a memory of a microcomputer, for example, but may be provided through an electric communication line such as the Internet or may be provided by being recorded on a recording medium such as a memory card. .
  • the second control processing unit 32 periodically sets the target value of the output current of the second converter circuit 31 based on the power information (target value of the output current) that the communication unit 34 periodically receives from the power conversion device 2. Update to
  • the second control processing unit 32 generates a control signal (PWM signal) for PWM control of the switching element included in the second converter circuit 31 so that the output current measured by the second measurement unit 33 matches the target value.
  • PWM signal a control signal for PWM control of the switching element included in the second converter circuit 31 so that the output current measured by the second measurement unit 33 matches the target value.
  • the operation of outputting to the second converter circuit 31 is repeatedly performed continuously.
  • power information is input from the system management unit 223 to the communication unit 34 at a predetermined time interval (for example, an interval of 100 mS), and the second control processing unit 32 sends a control signal to the second converter circuit 31 during this time interval.
  • a predetermined time interval for example, an interval of 100 mS
  • the second control processing unit 32 sends a control signal to the second converter circuit 31 during this time interval.
  • the time interval at which the second control processing unit 32 outputs the control signal to the second converter circuit 31 is shorter than the time interval at which power information is input from the system management unit 223 to the communication unit 34. Therefore, the second control processing unit 32 can control the output of the second converter circuit 31 at a time interval shorter than the time interval at which the power information is input, and the control responsiveness is improved.
  • the power information Communication traffic can be reduced by reducing the number of times of transmission.
  • the measurement unit 225 of the system management unit 223 uses the current sensor 227 to measure the current I1 at a predetermined time interval. Based on the measurement result of the measurement unit 225, the control command unit 226 of the system management unit 223 is in a power purchase state in which power is input from the AC power system 100 or power sale that outputs power to the AC power system 100. Judge whether it is in the state, and obtain the tidal current power. The control command unit 226 determines the target value of the input / output current of the DC power supply device 3 and the target value of the output current of the DC / DC converter 21 based on the result of obtaining the power flow.
  • the control command unit 226 controls the output of the DC power supply device 3 to discharge from the storage battery unit 12 in order to reduce the input power from the AC power system 100. That is, the control command unit 226 determines the target value of the output power from the DC power supply device 3 based on the power value of the input power from the AC power system 100, the output capability of the inverter circuit 220, and the like. Then, the control command unit 226 transmits a control signal instructing the target value of the output current corresponding to the target value of the output power from the communication unit 224 to the communication unit 34 of the DC power supply device 3 by communication.
  • the control command unit 226 allows the direct current power supply so that the reverse power flow becomes zero.
  • a target value of output power (that is, output current) from the device 3 is determined.
  • the control command unit 226 transmits a control signal indicating the determined output current from the communication unit 224 to the communication unit 34 of the DC power supply device 3 by communication.
  • the control command unit 226 transmits a control signal that instructs the storage battery unit 12 to be charged. To the communication unit 34 of the DC power supply device 3 by communication.
  • control command unit 226 determines the target value of the input / output current of the DC power supply device 3 and the target value of the output current of the DC / DC converter 21 depending on whether the power purchase state or the power sale state. . Then, the control command unit 226 transmits the target value of the input / output current of the DC power supply device 3 and the target value of the output current of the DC / DC converter 21 from the communication unit 224 at a predetermined time interval. / Controls the output of the DC converter 21. Further, the system management unit 223 controls the output of the inverter circuit 220 by outputting a control signal to the inverter control processing unit 222 at predetermined time intervals.
  • the first control processing unit 212 of the DC / DC converter 21 receives the target value of the output current from the system management unit 223, the first converter circuit so that the output current from the first converter circuit 211 matches the target value.
  • the switching element 211 is PWM controlled.
  • the second control processing unit 32 of the DC power supply device 3 ensures that the output current from the second converter circuit 31 matches the target value. Then, the switching element of the second converter circuit 31 is PWM-controlled.
  • the system management unit 223 of the power conversion device 2 transmits the target value of the input / output current based on the power flow (forward power or reverse power) to the DC / DC converter 21 and the DC power supply device 3. Yes. Therefore, it is not necessary for the DC power supply device 3 and the DC / DC converter 21 to include a circuit for measuring power flow. Therefore, between a DC power supply device (DC power supply device 3 and DC / DC converter 21) connected to a DC power supply that does not allow reverse power flow and a circuit (for example, a current sensor) for measuring power flow. No need to connect wires. Therefore, there is an advantage that the labor of wiring work is reduced and the degree of freedom of the installation position of the DC power supply device 3 is improved.
  • the system management unit 223 converts the direct-current voltage input from the direct-current power source and outputs the target value of the output current or output power to the direct-current power supply device and the DC / DC converter that perform only one-way voltage conversion. Can be sent. Further, the system management unit 223 may transmit the target value of the input / output current or the input / output power to the DC power supply device and the DC / DC converter that perform bidirectional voltage conversion.
  • FIG. 2 is a system configuration diagram of a power conversion system 1A according to the first modification.
  • components similar to those in the above embodiment are denoted by common reference numerals and description thereof is omitted as appropriate.
  • the power conversion device 2 includes the DC / DC converter 21, but in the power conversion system 1A of the first modification, the power conversion device 2A includes only the DC / AC converter 22.
  • Two DC power supply devices 3 and 3A are connected to the DC line DC1 of the power conversion device 2A via electric wires 6 and 6A.
  • a storage battery unit 12 is connected to the DC power supply device 3, and a photovoltaic power generation device 11 is connected to the DC power supply device 3A.
  • the DC power supply device 3 ⁇ / b> A has the same configuration as the DC power supply device 3.
  • the first connection unit 301A, the second connection unit 302A, the second control processing unit 32A, the second measurement unit 33A, and the communication unit 34A of the DC power supply device 3A are respectively connected to the first connection unit 301 and the second connection unit of the DC power supply device 3. This corresponds to the connection unit 302, the second control processing unit 32, the second measurement unit 33, and the communication unit 34. Therefore, description of the first connection unit 301A, the second connection unit 302A, the second control processing unit 32A, the second measurement unit 33A, and the communication unit 34A is omitted.
  • the second converter circuit 31A of the DC power supply device 3A is the same as the second converter circuit 31 of the DC power supply device 3 except that only one-way voltage conversion is performed, and thus the description thereof is omitted.
  • DC power supply devices 3 and 3A that convert a DC voltage input from a DC power source into a DC voltage having a predetermined voltage value and a power conversion device 2A that includes only the DC / AC converter 22 are modularized. Yes. Desired DC power supply devices 3 and 3A can be connected to the DC line DC1 of the power conversion device 2A, and the power conversion device 2A converts DC power input from the DC power supply devices 3 and 3A into AC power.
  • the DC power supply devices 3 and 3A receive the target value (power information) of the input / output current based on the power flow from the power conversion device 2, so the DC power supply devices 3 and 3A measure the power flow. It is not necessary to provide a circuit for performing the above. Therefore, a circuit for measuring power flow (for example, a current sensor) and the DC power supply devices 3 and 3A are not required, and the wiring work is reduced, so that the DC power supply devices 3 and 3A are reduced. The degree of freedom of the installation position is improved.
  • two DC power supply devices 3 and 3A are connected to the power conversion device 2A.
  • one DC power supply device may be connected to the power conversion device 2A, or three or more DC power supplies may be connected.
  • a power supply device may be connected.
  • the control circuit 221 uses the second control processing units 32 and 32A of the DC power supply devices 3 and 3A provided with the bidirectional converter according to the power flow.
  • the current value of the input / output current (target current value) is transmitted as power information.
  • the control circuit 221 transmits the current value (target current value) of the output current corresponding to the power flow as power information to the first control processing unit 212 of the DC / DC converter 21 including the unidirectional converter. . Since the voltage value of the DC line DC1 is constant at about 300V, the control circuit 221 transmits the current value (target current value) of the input / output current or the output current as the target value, thereby setting the output power to a desired value.
  • the control circuit 221 transmits a target value (target current value) of a current (output current or input / output current) according to the power flow as power information, the power information is not limited to the target current value.
  • the control circuit 221 transmits a target value (target power value) of power (output power or input / output power) according to the tidal power as power information to the second control processing units 32 and 32A and the first control processing unit 212. Also good.
  • the control circuit 221 transmits the target value of power to the DC / DC converter 21 and the DC power supply devices 3 and 3A.
  • the power (output power or input / output power) can be controlled to a desired value (target power value).
  • the target values of current and power may be absolute values of current and power, or may be relative values that are changes in current and power since the previous transmission.
  • control circuit 221 may transmit the tidal power itself to the second control processing units 32 and 32A and the first control processing unit 212 as power information.
  • the second control processing units 32 and 32A and the first control processing unit 212 receive the tidal power as power information, the currents of the second converter circuits 31 and 31A and the first converter circuit 211 based on the received tidal power ( A target value of output current or input current) or power (output power or input power) is determined.
  • the second control processing units 32 and 32A and the first control processing unit 212 are the current (output current or input current) or power (output power or input power) of the second converter circuits 31, 31A and the first converter circuit 211.
  • PWM control is performed on the switching elements of the second converter circuits 31, 31 ⁇ / b> A and the first converter circuit 211 so as to match the target value.
  • the second control processing units 32 and 32A of the DC power supply devices 3 and 3A connected to the storage battery unit 12 that does not allow reverse power flow are connected to the second converter circuits 31 and 31A. Is determined so that the reverse power flow is zero.
  • the second control processing units 32 and 32A are arranged so that the output current or output power of the second converter circuits 31 and 31A coincides with the target value, that is, the reverse flow power becomes zero.
  • the output current or output power of 31A is controlled.
  • control circuit 221 may transmit both the tidal power and the target value of the output corresponding to the tidal power as power information to the second control processing units 32 and 32A and the first control processing unit 212 by communication.
  • the second control processing units 32 and 32A and the first control processing unit 212 may control input / output based on at least one of the tidal power and the input / output target value corresponding to the tidal power.
  • the control circuit 221 may confirm the reception of the power information depending on whether or not a return signal is received after transmitting the power information. If the control circuit 221 cannot receive a reply signal within a predetermined time from the transmission of the power information, the control circuit 221 determines that the communication unit 34, 34A or the first control processing unit 212 of the transmission partner has failed to receive the power information.
  • the control circuit 221 may retransmit the power information to the communication unit 34, 34A or the first control processing unit 212 of the transmission partner, or at the next transmission timing, the communication unit 34, 34A or the first of the transmission partner.
  • the power information may be transmitted to the control processing unit 212.
  • the control circuit 221 transmits the output current or output power target value as a relative value
  • the control circuit 221 adds the current relative value for which transmission failed and the relative value at the next transmission timing. What is necessary is just to transmit at the next transmission timing by using the combined value as the target value.
  • the control circuit 221 when a plurality of DC power supply devices are connected to the DC line DC1, the control circuit 221 communicates power information including the output target value to each of the plurality of DC power supply devices. Send by.
  • the control circuit 221 transmits the output target value to the plurality of DC power supply devices, the plurality of DC power supply devices are set so that the sum of the outputs of the plurality of DC power supply devices becomes a value corresponding to the reverse power flow. What is necessary is just to determine the target value transmitted to each.
  • the control circuit 221 sends a target value to be transmitted to each DC power supply so as to reduce the output power of each DC power supply by a value obtained by equally dividing the reverse power flow by the number of DC power supplies that are not allowed to have a reverse power flow. May be determined.
  • the target power transmitted to each DC power supply device is set according to the priority so that the reverse power flow becomes zero. It may be set by assigning with different weights.
  • This priority may be set, for example, according to the response characteristic of the output suppression control of each DC power supply device, or may be set according to the rated value of the input / output power of each DC power supply device. Good.
  • the priority may be set according to the chargeable capacity (remaining power storage amount) at that time.
  • DC power from two DC power sources is input to the DC line DC1, but DC power from three or more DC power sources may be input to the DC line DC1.
  • the solar power generation device 11 which is a power generation device and the stationary storage battery unit 12 were illustrated as DC power supply
  • DC power supply is power generation devices, such as a fuel cell and a wind power generator.
  • the electric vehicle is, for example, a hybrid vehicle, a plug-in hybrid vehicle, an electric vehicle, or the like.
  • the communication unit 224 transmits power information to the DC power supply device 3 and the DC / DC converter 21 by wireless communication, but the communication method is not limited to wireless communication, and may be wired communication. In the case of wired communication, the communication unit 224 may perform communication using, for example, a power line carrier communication method, or may perform communication via a dedicated communication line.
  • the customer facility 10 is a detached house.
  • the customer facility 10 may be a dwelling unit of an apartment house or a tenant of an office building or a commercial building.
  • the power conversion device (2, 2A) of the first aspect includes an inverter circuit (220) and a control circuit (221) that controls the inverter circuit (220).
  • the inverter circuit (220) converts DC power input from a DC line (DC1) to which a DC power supply (3, 3A) that outputs DC power is connected to AC power and outputs the AC power to the AC power system (100). To do.
  • the control circuit (221) transmits power information by communication to the DC power supply (3, 3A).
  • the power information includes at least one of a tidal power flowing bidirectionally with the AC power system (100) and a target value of the output of the DC power supply (3, 3A) according to the tidal power.
  • the control circuit (221) since the control circuit (221) transmits power information to the DC power supply (3, 3A) by communication, the DC power supply (3, 3A) and the tidal power are measured. There is no need for an electric wire to connect to a circuit (for example, a current sensor). Therefore, there is an advantage that the labor of wiring work is reduced and the degree of freedom of the installation position of the DC power supply (3, 3A) is improved.
  • the DC power supply device includes the charge / discharge device (3).
  • the charging / discharging device (3) includes a bidirectional converter circuit (31) connected to the storage battery (12) and performing bidirectional voltage conversion between the storage battery (12) and the DC line (DC1).
  • the control circuit (221) transmits power information to the charge / discharge device (3) of the DC power supply (2, 2A) by communication.
  • the power information transmitted from the control circuit (221) to the charging / discharging device (3) includes at least one of the tidal power and the input / output target value of the bidirectional converter circuit (31) according to the tidal power.
  • the control circuit (221) since the control circuit (221) transmits power information to the charging / discharging device (3) by communication, the charging / discharging device (3) and a circuit for measuring power flow (for example, current) No electric wires are required to connect to the sensor. Therefore, there is an advantage that the labor of wiring work is reduced and the degree of freedom of the installation position of the charge / discharge device (3) is improved.
  • the plurality of DC power supply devices (3, 3A) are connected to the DC line (DC1).
  • the control circuit (221) transmits the output target value to the plurality of DC power supply devices (3, 3A)
  • the sum of the outputs of the plurality of DC power supply devices (3, 3A) becomes a value corresponding to the tidal power.
  • the target value transmitted to each of the plurality of DC power supply devices (3, 3A) is determined.
  • the control circuit (221) is connected to each of the plurality of DC power supply devices (3, 3A).
  • the target value can be adjusted.
  • the time interval at which the control circuit (221) transmits the power information to the DC power supply device (3, 3A) is The DC power supply device (3, 3A) is longer than the time interval for repeating the output control operation.
  • the control responsiveness is improved. improves. Further, since the time interval at which the DC power supply device (3, 3A) receives the power information is longer than the time interval at which the DC power supply device (3, 3A) repeats the output control operation, the number of transmissions of the power information can be reduced.
  • the target value is the current output from the DC power supply (3, 3A) to the DC line (DC1). This is the target current value.
  • the current value of the current output from the DC power supply device (3, 3A) to the DC line (DC1) can be controlled to the target current value.
  • the target value is the power output from the DC power supply device (3, 3A) to the DC line (DC1). This is the target power value.
  • the power value of the power output from the DC power supply (3, 3A) to the DC line (DC1) can be controlled to the target value.
  • the control circuit (221) transmits power information to the DC power supply device (3, 3A). The reception of power information will be confirmed later. The control circuit (221) confirms reception of the power information depending on whether or not a return signal is received from the DC power supply (3, 3A).
  • the control circuit (221) confirms the reception of the power information depending on whether or not the reply signal is received. Therefore, if the reception confirmation cannot be performed, the control circuit (221) performs processing such as resending the power information. be able to.
  • the DC power supply device (3, 3A) is based on the power information received from the control circuit (221). Control the output.
  • the degree of freedom of the installation position of the DC power supply device (3, 3A) that can control the output based on the power information received from the control circuit (221) can be improved.
  • the voltage value of the DC voltage input from the DC power supply (11) is converted and output to the DC line (DC1).
  • a converter circuit (211) is further provided.
  • only the power conversion device (2) can convert the DC power input from the DC power source (11) into AC power and output it to the AC power system (100).
  • a power conversion system (1, 1A) includes a power conversion device (2, 2A) according to any one of the first to ninth aspects, and a DC line (DC1) of the power conversion device (2, 2A). And a DC power supply device (3, 3A) for outputting DC power.
  • the degree of freedom of the installation position of the DC power supply device (3, 3A) can be improved.
  • the DC power supply device (3, 3A) of the eleventh aspect includes a first connection unit (301, 301A), a second connection unit (302, 302A), a converter circuit (31, 31A), and a reception unit (34). , 34A) and a processing unit (32, 32A).
  • the first connection part (301, 301A) is connected to the DC power supply (11, 12).
  • the second connection unit (302, 302A) is connected to the DC line (DC1) of the power converter (2, 2A).
  • the power converter (2, 2A) converts DC power input from the DC line (DC1) into AC power and outputs the AC power to the AC power system (100).
  • the converter circuit (31, 31A) converts a DC voltage value between the first connection part (301, 301A) and the second connection part (302, 302A).
  • the receiving unit (34, 34A) receives power information from the power conversion device (2, 2A) by communication.
  • the power information includes at least one of the tidal power output from the power converter (2, 2A) to the AC power system (100) and the target value of the output of the converter circuit (31) corresponding to the tidal power.
  • the converter control unit (32, 32A) controls the converter circuit (31, 31A) based on the power information received by the receiving unit (34, 34A).
  • the degree of freedom of the installation position of the DC power supply device (3, 3A) can be improved.

Landscapes

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

Abstract

La présente invention aborde le problème de fourniture d'un dispositif de conversion de courant, d'un système de conversion de courant, et d'un dispositif d'alimentation en courant continu dans lequel le degré de liberté d'un emplacement pour installer le dispositif d'alimentation en courant continu peut être augmenté. Un dispositif de conversion de courant (2) est pourvu : d'un circuit onduleur (220) ; et d'un circuit de commande (221) qui commande le circuit onduleur (220). Le circuit onduleur (220) convertit, en courant alternatif, un courant continu entré à partir d'une ligne en courant continu (DC1) à laquelle un dispositif d'alimentation électrique en courant continu (3) permettant de produire du courant continu est connecté, et transmet le courant alternatif à un système d'alimentation en courant alternatif (100). Le circuit de commande (221) transmet des informations d'énergie au dispositif d'alimentation électrique en courant continu (3) par l'intermédiaire d'une communication. Les informations d'énergie comprennent de l'énergie marémotrice devant être transmise par le circuit onduleur (220) au système d'alimentation en courant alternatif (100) et/ou une valeur cible de sortie du dispositif d'alimentation électrique en courant continu (3) correspondant à l'énergie marémotrice.
PCT/JP2018/011409 2017-03-31 2018-03-22 Dispositif de conversion de courant, système de conversion de courant, et dispositif d'alimentation en courant continu Ceased WO2018180889A1 (fr)

Applications Claiming Priority (2)

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JP2017-072693 2017-03-31
JP2017072693A JP6890303B2 (ja) 2017-03-31 2017-03-31 電力変換装置、電力変換システム、及び直流電源装置

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JP7026419B1 (ja) * 2020-12-16 2022-02-28 株式会社MR Japan 電力供給システム
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CN113381429B (zh) * 2021-06-04 2022-05-20 西南交通大学 一种轨道交通柔性供电装置及协调控制方法

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