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WO2018179714A1 - Dispositif et système de conversion d'énergie - Google Patents

Dispositif et système de conversion d'énergie Download PDF

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Publication number
WO2018179714A1
WO2018179714A1 PCT/JP2018/001804 JP2018001804W WO2018179714A1 WO 2018179714 A1 WO2018179714 A1 WO 2018179714A1 JP 2018001804 W JP2018001804 W JP 2018001804W WO 2018179714 A1 WO2018179714 A1 WO 2018179714A1
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WO
WIPO (PCT)
Prior art keywords
power
inverter
converter
bus
control circuit
Prior art date
Application number
PCT/JP2018/001804
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English (en)
Japanese (ja)
Inventor
賢治 花村
藤井　裕之
渉 堀尾
菊池　彰洋
智規 伊藤
康太 前場
Original Assignee
パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2018179714A1 publication Critical patent/WO2018179714A1/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
    • H02J3/38—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

Definitions

  • the present invention relates to a power conversion device and a power conversion system that convert DC power into AC power.
  • a typical configuration of a distributed power supply system connected to a system is a configuration in which a single distributed power supply is used to connect the system via a DC-DC converter, a DC bus and an inverter, and a plurality of distributed power supplies. Are connected to each other via each DC-DC converter, a common DC bus and one inverter.
  • the DC-DC converter and the inverter are physically installed in a single housing, the DC-DC converter and the inverter are controlled independently by separate control devices (for example, a microcomputer). Sometimes it is done. In such a distributed power supply system in which the DC-DC converter and the inverter are physically or controlly separated, it is necessary to make adjustments between the respective power conversion units.
  • the inverter discharge power in response to events such as system voltage rise, inverter component temperature rise, remote output command reception, and reverse power flow detection
  • a control method for suppressing the above is used.
  • the voltage of the DC bus rises immediately after starting the inverter output suppression.
  • the DC-DC converter determines from the rise in the voltage of the DC bus that the inverter is suppressing the output, and suppresses the discharge power to the DC bus so that the voltage of the DC bus does not rise above a predetermined voltage.
  • the voltage of the DC bus is controlled to be maintained at the set voltage by the DC-DC converter while the output suppression function of the inverter is working.
  • the voltage of the DC bus set in this DC-DC converter is higher than the voltage of the DC bus in the steady state, which causes a reduction in the power conversion efficiency of the inverter.
  • the present invention has been made in view of such a situation, and an object thereof is to provide a power conversion device and a power conversion system that realize high-efficiency power conversion even while the output suppression function of the inverter is working.
  • a power converter includes a DC-DC converter that converts a voltage of DC power output from a DC power source and outputs the converted DC power to a DC bus, and the DC bus. And an inverter that converts the DC power of the DC bus into AC power, supplies the converted AC power to a load or a power system, and a control circuit that controls the inverter.
  • the control circuit controls the inverter to lower the output of the inverter to a first target value when the output from the inverter to the power system should be suppressed, and a second lower than the first target value.
  • the target value is notified to another control circuit that controls the DC-DC converter.
  • FIGS. 2A and 2B are diagrams schematically showing the voltage state of the DC bus (part 1).
  • FIGS. 3A and 3B are diagrams schematically showing the voltage state of the DC bus (part 2).
  • 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 converter 10 includes a DC-DC converter 11, a converter control circuit 12, an inverter 13, an inverter control circuit 14, and a system control circuit 15.
  • the system control circuit 15 includes a reverse flow power measurement unit 15a, a command value generation unit 15b, and a communication control unit 15c.
  • the DC-DC converter 11 and the inverter 13 are connected by a DC bus 40.
  • the converter control circuit 12 and the system control circuit 15 are connected by a communication line 41, and communication conforming to a predetermined serial communication standard (for example, RS-485 standard, TCP-IP standard) is performed between the two.
  • a predetermined serial communication standard for example, RS-485 standard, TCP-IP standard
  • the 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 40.
  • the DC-DC converter 11 can be constituted by a step-up chopper, for example.
  • the converter control circuit 12 controls the DC-DC converter 11. As a basic control, the converter control circuit 12 performs MPPT (Maximum Power Point Tracking) control of the DC-DC converter 11 so that the output power of the solar cell 2 is maximized. Specifically, converter control circuit 12 measures the input voltage and input current of DC-DC converter 11, which are the output voltage and output current of solar cell 2, and estimates the generated power of solar cell 2. The converter control circuit 12 generates a command value for setting the generated power of the solar battery 2 to the maximum power point (optimum operating point) based on the measured output voltage of the solar battery 2 and the estimated generated power.
  • MPPT Maximum Power Point Tracking
  • 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 DC-DC converter 11 performs a switching operation according to a drive signal based on the generated command value.
  • the inverter 13 is a bidirectional inverter that converts DC power input from the DC bus 40 into AC power and outputs the converted AC power to a distribution line 50 connected to a commercial power system (hereinafter simply referred to as system 4). To do. A load 5 is connected to the distribution line 50. Further, the inverter 13 converts AC power supplied from the system 4 into DC power, and outputs the converted DC power to the DC bus 40. A smoothing electrolytic capacitor (not shown) is connected to the DC bus 40.
  • the inverter control circuit 14 controls the inverter 13. As a basic control, the inverter control circuit 14 controls the inverter 13 so that the voltage of the DC bus 40 maintains the first threshold voltage. Specifically, the inverter control circuit 14 detects the voltage of the DC bus 40 and generates a command value for making the detected bus voltage coincide with the first threshold voltage. The inverter control circuit 14 generates a command value for increasing the duty ratio of the inverter 13 when the voltage of the DC bus 40 is higher than the first threshold voltage, and the inverter control circuit 14 when the voltage of the DC bus 40 is lower than the first threshold voltage. A command value for lowering the duty ratio of 13 is generated. The inverter 13 performs a switching operation according to a drive signal based on the generated command value.
  • 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 DC-DC converter 21 and a converter control circuit 22.
  • the converter control circuit 22 and the system control circuit 15 of the first power conversion device 10 are connected by a communication line 42, and communication based on a predetermined serial communication standard is performed between them.
  • the DC-DC converter 21 is a bidirectional converter that is connected between the power storage unit 3 and the DC bus 40 and charges and discharges the power storage unit 3.
  • the converter control circuit 22 controls the DC-DC converter 21.
  • the converter control circuit 22 controls the DC-DC converter 21 based on the command value transmitted from the system control circuit 15 to control the power storage unit 3 at a constant current (CC) / constant voltage (CV).
  • CC constant current
  • CV constant voltage
  • Charge / discharge For example, the converter control circuit 22 receives a power command value from the system control circuit 15 at the time of discharging, and uses a value obtained by dividing the power command value by the voltage of the power storage unit 3 as a current command value. Discharge.
  • the operation display device 30 is a user interface of the first power conversion device 10 and is installed at a predetermined position in the room.
  • the operation display device 30 can be constituted by a touch panel display, for example, and provides predetermined information to the user and accepts an operation from the user.
  • the operation display device 30 and the system control circuit 15 are connected by a communication line 43, and communication based on a predetermined serial communication standard is performed between them.
  • the operation display device 30 and the system control circuit 15 may be connected wirelessly.
  • the output power of the inverter 13 needs to be suppressed.
  • the main output suppression reasons include the occurrence of reverse power flow from the inverter 13 to the grid 4, the rise of the grid voltage exceeding the set voltage, the reception of the remote output command, the temperature rise exceeding the set temperature of the components in the inverter 13, the inverter 13 An increase in power exceeding the rated power and an increase in current exceeding the rated current of the inverter 13 can be mentioned.
  • the system control circuit 15 receives an instruction related to the output power amount and output timing to the grid 4 from a grid operating organization such as a power company via an external network (for example, the Internet or a dedicated line).
  • a grid operating organization such as a power company
  • an external network for example, the Internet or a dedicated line
  • the reverse power flow measurement unit 15 a of the first power conversion device 10 detects the occurrence of reverse power flow based on the measurement value of a CT sensor (not shown) installed on the distribution line 50. .
  • the converter control circuit 22 of the second power conversion device 20 receives reverse flow detection information from the system control circuit 15 via the communication line 42.
  • the communication line 42 is often installed over the DC bus 40 that connects the first power conversion device 10 and the second power conversion device 20, and in this configuration, the communication line 42 is affected by noise from the DC bus 40. .
  • the shorter the unit period representing one bit the weaker it becomes to noise. Basically, the bit error is more likely to occur as the communication speed is increased.
  • the first power conversion device 10 detects reverse power flow, generates communication data instructing output suppression, and transmits the communication data to the second power conversion device 20 via the communication line 42, it is defined in the grid interconnection regulations.
  • the time limit 500 ms
  • the content of communication data may change during the process due to noise.
  • the inverter control circuit 14 controls the inverter 13 so that the voltage of the DC bus 40 maintains the first threshold voltage as basic control.
  • the inverter control circuit 14 executes output suppression control as priority control. Specifically, the inverter control circuit 14 controls the inverter 13 so that the output of the inverter 13 does not exceed the command value (specifically, the upper limit current value or the upper limit power value) generated by the command value generation unit 15b.
  • the bus voltage stabilization control for controlling the voltage of the DC bus 40 to be maintained at the first threshold voltage is stopped.
  • the converter control circuit 22 receives, as basic control, the amount of discharge from the power storage unit 3 to the DC-DC converter 21 or the amount of charge from the DC-DC converter 21 to the power storage unit 3 transmitted from the system control circuit 15.
  • the DC-DC converter 21 is controlled so that the command value comes.
  • the converter control circuit 22 controls the DC-DC converter 21 as priority control so that the voltage of the DC bus 40 does not exceed the second threshold voltage. This control has priority over the control for adjusting the output to the command value transmitted from the system control circuit 15.
  • the second threshold voltage is set to a value higher than the first threshold voltage.
  • the converter control circuit 12 performs MPPT control on the DC-DC converter 11 so that the output power of the solar cell 2 is maximized as basic control. Further, the converter control circuit 12 controls the DC-DC converter 11 as priority control so that the voltage of the DC bus 40 does not exceed the third threshold voltage. This control has priority over MPPT control.
  • the third threshold voltage is set to a value higher than the second threshold voltage.
  • the first threshold voltage is set to a steady voltage of the DC bus 40.
  • the first threshold voltage is set in the range of DC 280 V to 360 V, for example.
  • the second threshold voltage is set to 390V
  • the third threshold voltage is set to 410V, for example.
  • FIGS. 2A and 2B are diagrams schematically showing the voltage state of the DC bus 40 (part 1).
  • FIG. 2A shows the voltage state of the DC bus 40 in a steady state. The constant voltage of the DC bus 40 is maintained at the first threshold voltage by the inverter 13.
  • FIG. 2B shows the voltage state of the DC bus 40 immediately after the output of the inverter 13 is suppressed. Normally, immediately after the output is suppressed, the voltage of the DC bus 40 increases, and the DC-DC converter 21 of the power storage unit 3 controls the voltage of the DC bus 40 so as not to exceed the second threshold voltage.
  • the power conversion efficiency of the inverter 13 increases as the voltage of the DC bus 40 is closer to the voltage of the system 4. Conversely, at the time of discharging, the conversion efficiency of the inverter 13 decreases as the voltage of the DC bus 40 becomes higher than the voltage of the system 4. As shown in FIG. 2B, in a state where the voltage of the DC bus 40 is higher than that in the steady state, the conversion efficiency of the inverter 13 is lower than that in the steady state.
  • FIGS. 3A and 3B are diagrams schematically showing the voltage state of the DC bus 40 (part 2).
  • a mechanism is introduced to reduce the voltage of the DC bus 40 from the second threshold voltage to the first threshold voltage during output suppression in order to avoid a decrease in the conversion efficiency of the inverter 13.
  • FIG. 4 is a diagram illustrating a first example of power control of the inverter 13 and power control of the DC-DC converter 21 of the power storage unit 3 when the output of the inverter 13 is suppressed.
  • the limit value (upper limit value) of the suppression power of the inverter 13 is set to the rated output power value of the inverter 13 in a steady state. That is, even if the voltage of the DC bus 40 increases due to a sudden event during normal operation, the output power of the inverter 13 is set to stop increasing at the rated output power value.
  • the limit value (upper limit value) of the DC-DC converter 21 of the power storage unit 3 is also set to the rated output power value of the DC-DC converter 21 in a steady state.
  • the inverter control circuit 14 decreases the output of the inverter 13 with a first slope.
  • the first slope is defined by a suppression amount [W / ms] per unit time.
  • the first slope is set so that the time from when the inverter 13 starts suppression during discharging at the rated output value to when suppression is completed is within 500 ms.
  • the power storage unit 3 discharges 2.0 kW, and the inverter 13 supplies 5.5 kW to the load 5.
  • the load 5 is disconnected from this state and the power consumption of the load 5 becomes 0.0 W, the 5.5 kW output power of the inverter 13 flows backward to the grid 4.
  • the reverse power flow is not stopped within 500 ms, the inverter 13 must be disconnected from the system 4, and the power generation of the solar cell 2 is stopped during the disconnection, resulting in an economic loss.
  • the command value generation unit 15b of the system control circuit 15 decreases the power command value of the inverter 13 from 5.5 kW to (0.0 ⁇ ) kW (first target value) according to the first inclination.
  • the command value generating unit 15b notifies the inverter control circuit 14 of the updated power command value for each first period.
  • Command value generation unit 15b reduces the power command value of DC-DC converter 21 of power storage unit 3 from 2.0 kW to (0.0 ⁇ ) kW (second target value) according to the first inclination. I will let you.
  • the command value generation unit 15b notifies the converter control circuit 22 of the updated power command value via the communication line 42 every second period.
  • the margin ⁇ is set to 0.05 kW, and the margin ⁇ is also set to 0.05 kW.
  • the second period is longer than the first period. That is, the power command value of the inverter 13 is updated more frequently. This is a limitation due to the use of the communication line 42.
  • the output suppression of the inverter 13 and the output suppression of the DC-DC converter 21 of the power storage unit 3 are started at the same timing, but actually, the DC-DC converter 21 of the power storage unit 3 is affected by the communication delay. Suppression of output starts later.
  • the first target value of the power command value of the inverter 13 is set to a negative value.
  • the first target value may be set to 0.0 kW. In this case, neither power purchase nor power sale occurs, and the most economical reverse power flow suppression control is achieved.
  • the first target value is set to a negative value, there is a slight power purchase state. In this case, the reverse power flow defined in the grid connection regulations can be more reliably prevented.
  • the first target value of the power command value of the inverter 13 is (reverse power flow ⁇ power consumption of the load ⁇ ) kW
  • the DC-DC converter of the power storage unit 3 The second target value of the power command value 21 is (reverse power flow-power consumption of the load 5- ⁇ - ⁇ ) kW.
  • the output of the inverter 13 may be suppressed by a current value or may be suppressed by a power value.
  • the current value it is possible to suppress overcurrent due to excessive output at the time of release of suppression.
  • the power value the output can be accurately suppressed even when the system voltage changes.
  • the output of the inverter 13 may be suppressed by both the current value and the power value. The same applies to the output suppression of the DC-DC converter 21 of the power storage unit 3.
  • the inverter control circuit 14 increases the output of the inverter 13 with the second slope.
  • the second slope is defined by the suppression release amount [W / ms] per unit time.
  • the second inclination is set more gently than the first inclination.
  • the second slope is determined based on the rated output value of the inverter 13 and the rated output value of the DC-DC converter 21, for example.
  • FIG. 5 is a diagram illustrating a second example of power control of the inverter 13 and power control of the DC-DC converter 21 of the power storage unit 3 when the output of the inverter 13 is suppressed.
  • the first example the example in which the first slope of the inverter 13 and the first slope of the DC-DC converter 21 of the power storage unit 3 are set to be the same has been described, but the first slope of the DC-DC converter 21 of the power storage unit 3 is described.
  • the inclination of 1 may be made gentler than the first inclination of the inverter 13. The same applies to the second inclination.
  • the first slope of the DC-DC converter 21 of the power storage unit 3 is set to be gentler than the first slope of the inverter 13 (see S1 and S1a).
  • the second slope of the DC-DC converter 21 of the power storage unit 3 is set to be gentler than the second slope of the inverter 13 (see S2 and S2a).
  • FIG. 6 is a diagram illustrating a third example of power control of the inverter 13 and power control of the DC-DC converter 21 of the power storage unit 3 when the output of the inverter 13 is suppressed.
  • the third example is an example in which the voltage of the DC bus 40 is reduced to the first threshold voltage during output suppression.
  • the voltage of the DC bus 40 decreases to the first threshold voltage, it is not necessary to increase the output suppression amount of the DC-DC converter 21 of the power storage unit 3 with respect to the output suppression amount of the inverter 13, so that both output suppression amounts Are controlled in the same way.
  • the DC-DC converter 21 of the power storage unit 3 suppresses the voltage rise of the DC bus 40 in preference to the suppression of the reverse flow power. To control. Thereby, power balance can be secured by suppressing the voltage of the DC bus 40 while eliminating the continuity of the reverse flow power. Therefore, the operation stop of the power conversion system 1 can be prevented.
  • the voltage of the DC bus 40 is increased by suppressing the output of the inverter 13. Can be prevented, and the voltage of the DC bus 40 can be lowered to a steady value. Therefore, a decrease in power conversion efficiency of the inverter 13 can be suppressed.
  • the temperature in the first power converter 10 rises, and output suppression due to the temperature rise is likely to be activated. In this case, an increase in the amount of electricity purchased and a reduction in the amount of power generated by the solar cell 2 lead to a decrease in economy.
  • the temperature rise in the 1st power converter device 10 leads to the temperature rise of the components (for example, electrolytic capacitor) in the 1st power converter device 10, and leads to shortening of a product life.
  • the temperature rise in the 1st power converter device 10 can be suppressed by suppressing the voltage rise of the DC bus 40.
  • the DC-DC converter 11 does not have to suppress the power generation of the solar cell 2.
  • the opportunity for selling the power generated by the solar cell 2 can be secured to the maximum, so that the economic merit is not impaired.
  • the inverter control circuit 14 and the system control circuit 15 are depicted separately, but each may be realized by a separate microcomputer or may be realized by a single microcomputer.
  • the example in which the first power conversion device 10 and the second power conversion device 20 are installed in different cases has been described.
  • a configuration example in which the system control circuit 15 and the converter control circuit 22 are connected by the communication line 42 while the first power conversion device 10 and the second power conversion device 20 are installed in one housing is also an example of the present invention. It is included in the embodiment.
  • the solar cell 2 is connected to the first power conversion device 10 .
  • another power generation device using renewable energy such as a wind power generation device or a micro hydraulic power generation device, may be connected.
  • a DC-DC converter (21) that converts the voltage of the DC power output from the DC power source (3) and outputs the converted DC power to the DC bus (40) is connected via the DC bus (40),
  • the control circuit (14, 15) is configured to reduce the output of the inverter (13) to a first target value when the output from the inverter (13) to the power system (4) is to be suppressed. (13) and a second target value lower than the first target value is notified to another control circuit (22) for controlling the DC-DC converter (21).
  • the DC power source (3) is the power storage unit (3), The power converter according to item 1, wherein the time when the output from the inverter (13) to the power system (4) should be suppressed is when a reverse power flow to the power system (4) occurs. (10). According to this, the voltage of the DC bus (40) can be reduced while the reverse power flow is suppressed.
  • the control circuit (14, 15) sets the first target value so that the reverse flow power to the power system (4) becomes a negative value.
  • the power conversion device (10) according to item 1 or 2, wherein the power conversion device (10) generates the second target value at a value lower than the first target value. According to this, it is possible to reduce the voltage of the DC bus (40) while more reliably suppressing the reverse power flow.
  • a DC-DC converter (21) for converting the voltage of the DC power output from the DC power supply (3) and outputting the converted DC power to the DC bus (40);
  • An inverter (13) connected via the DC bus (40), converting DC power of the DC bus (40) into AC power, and supplying the converted AC power to the load (5) or the power system (4)
  • a second control circuit (14, 15) for controlling the inverter (13) When the output from the inverter (13) to the power system (14) is to be suppressed, the second control circuit (14, 15) reduces the output of the inverter (13) to a first target value.
  • the power conversion system (1) characterized by controlling the inverter (13) and notifying the first control circuit (22) of a second target value lower than the first target value. According to this, the voltage of the DC bus (40) can be reduced during output suppression, and the reduction in conversion efficiency of the inverter (13) can be suppressed.
  • the first control circuit (22) and the second control circuit (14, 15) are connected by a communication line (42), The second control circuit (14, 15) maintains the voltage of the DC bus (40) at the first threshold voltage when it is not necessary to suppress the output from the inverter (13) to the power system (4).
  • the first control circuit (22) receives the DC-DC converter (21) based on a command value generated from the second target value received from the second control circuit (14, 15). And controlling the voltage of the DC bus (40) so as not to exceed a second threshold voltage higher than the first threshold voltage. According to this, it is possible to stabilize the voltage of the DC bus (40) during suppression and after cancellation of suppression while suppressing a voltage increase immediately after the start of suppression of the DC bus (40).
  • a DC-DC converter for the power generator (2) that converts the voltage of the DC power output from the power generator (2) that generates power based on renewable energy and outputs the converted DC power to the DC bus (40).
  • the power generator (2) is controlled so that the output power is maximized, and the voltage of the DC bus (40) is controlled so as not to exceed a third threshold voltage higher than the second threshold voltage.
  • the second control circuit (14, 15) receives the amount of power input to the inverter (13).
  • a DC-DC converter (21) for converting the voltage of the DC power output from the DC power supply (3) and outputting the converted DC power to the DC bus (40);
  • the DC-DC converter (21) converts the DC power of the DC bus (40) into AC power via the DC bus (40), and converts the converted AC power into a load (5) or a power system (4).
  • the first control circuit (22) reduces the output of the inverter (13) to a first target value.
  • control is performed so that the DC-DC converter (21) is lowered to the second target value.
  • the power converter device (20) characterized by performing. According to this, the voltage of the DC bus (40) can be reduced during output suppression, and the reduction in conversion efficiency of the inverter (13) can be suppressed.
  • the present invention can be used for a distributed power supply system in which a solar battery and a stationary storage battery are combined.

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

Abstract

La présente invention concerne un dispositif de conversion d'énergie (10) dans lequel un onduleur (13) est connecté, par l'intermédiaire d'un bus CC (40), à un convertisseur CC-CC (21) qui convertit la tension de l'énergie CC délivrée par une source d'alimentation CC et délivre l'énergie CC convertie au bus CC (40). L'onduleur (13) convertit l'énergie CC dans le bus CC (40) en énergie CA, et fournit l'énergie CA obtenue par conversion à une charge (5) ou à un système (4). Des circuits de commande (14, 15) commandent l'onduleur (13). Quand la sortie de l'onduleur (13) vers le système (4) doit être supprimée, les circuits de commande (14, 15) commandent l'onduleur (13) de telle sorte que la sortie de l'onduleur (13) est abaissée à une première valeur cible, et notifient à un circuit de commande de convertisseur (22) qui commande le convertisseur CC-CC (21) une seconde valeur cible inférieure à la première valeur cible.
PCT/JP2018/001804 2017-03-30 2018-01-22 Dispositif et système de conversion d'énergie WO2018179714A1 (fr)

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JP2017-068995 2017-03-30
JP2017068995A JP6832511B2 (ja) 2017-03-30 2017-03-30 電力変換装置、電力変換システム

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