WO2021159873A1 - Chaîne de conversion d'équilibrage d'énergie bidirectionnelle, routeur d'énergie électrique et procédé de commande - Google Patents

Chaîne de conversion d'équilibrage d'énergie bidirectionnelle, routeur d'énergie électrique et procédé de commande Download PDF

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Publication number
WO2021159873A1
WO2021159873A1 PCT/CN2020/140665 CN2020140665W WO2021159873A1 WO 2021159873 A1 WO2021159873 A1 WO 2021159873A1 CN 2020140665 W CN2020140665 W CN 2020140665W WO 2021159873 A1 WO2021159873 A1 WO 2021159873A1
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Prior art keywords
port
unit
power
switch
balance
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PCT/CN2020/140665
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English (en)
Chinese (zh)
Inventor
谢晔源
王宇
李海英
孙乐
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南京南瑞继保电气有限公司
南京南瑞继保工程技术有限公司
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Publication of WO2021159873A1 publication Critical patent/WO2021159873A1/fr

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    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels

Definitions

  • This application relates to the field of power electronics technology, and in particular to a two-way energy balance converter chain, an electric energy router, and a control method.
  • Power semiconductor devices are composed of sub-modules (or power units), and then cascaded to form a converter chain, which can easily meet the voltage level requirements of the module. Compared with other solutions, it is a cost-effective way. However, once the converter chain is subjected to overvoltage, or there is a problem of voltage unevenness between the sub-modules of the converter chain, the voltage of individual sub-modules will be too high, or even damaged due to overvoltage. The expansion of the fault will cause the entire converter chain to malfunction and damage.
  • the auxiliary capacitor distributed half-bridge MMC self-balancing topology based on equation constraints is used to establish the charging between the sub-module DC capacitors.
  • the discharge channel uses the auxiliary circuit between the three-phase bridge arms to achieve the function of DC voltage balance control, but the disadvantages of this method are: first, when a single sub-module fails, even if the bypass switch of the power unit is closed, the auxiliary The circuit will still maintain the connection relationship between the normal module and the faulty module.
  • the DC capacitors of the adjacent sub-modules will discharge to the fault point through the auxiliary circuit. If the auxiliary circuit is simply disconnected by the switch, the auxiliary circuit will be opened, and the auxiliary balance circuit of the entire converter chain will be disconnected here. Therefore, the reliability of the scheme is low and the project feasibility is poor; second, The DC voltage of this scheme can only be balanced in one direction, and the charging and discharging direction is irreversible. It is required that the equalization circuit of the commutation chain must form a closed loop, which is difficult to achieve in many topologies, and the above-mentioned methods are greatly restricted in application.
  • the purpose of the present invention is to provide a two-way energy balance commutation chain, which can realize energy balance in both directions of the commutation chain through a multi-port balance unit, and realize DC voltage balance control.
  • the present invention also provides an energy router composed of the above-mentioned two-way energy balance commutation chain and a control method.
  • the solution of the present invention is:
  • a two-way energy balance commutation chain including:
  • the M power units include two AC terminals, the AC terminals of adjacent power units are sequentially connected in series, the empty port of the head-end power unit is defined as the first power port, and the empty port of the tail-end power unit Leading out is defined as the second power port;
  • the power unit includes a first DC capacitor and a power component connected in parallel, and M is an integer greater than or equal to 1;
  • N is an integer greater than or equal to 1 and less than or equal to M;
  • the number P of the ports of the multi-port balance unit is 3 or 4;
  • the first port of the head end multi-port balance unit is defined as the first balance port
  • the second port is connected to the first port of the adjacent multi-port balance unit, and is connected in this way.
  • the second port of the tail end multi-port balance unit The port lead is defined as the second balanced port.
  • the multi-port balance unit in the bidirectional energy balance commutation chain is used to control the charging and discharging between the first DC capacitors of adjacent power units.
  • the bidirectional energy balance commutation chain further includes a first bypass switch, and the first bypass switch is connected in parallel between the first port and the second port of the multi-port balance unit.
  • the multi-port balance unit includes first, second, third, and fourth switch units, and one end of the first and second switch units are respectively connected to the first and second ports; The other ends of the two switch units are connected to the third port after being connected; one ends of the third and fourth switch units are respectively connected to the first and second ports, and the other end is connected to the fourth port.
  • the multi-port balance unit includes first and second switch units, one end of the first and second switch units are respectively connected to the first and second ports; the first switch unit and the second switch unit The other end of the switch unit is connected to the third port.
  • the multi-port balance unit includes first, second, and third switch units, one end of the first and second switch units are connected to the first and second ports respectively; the first switch unit is connected to The other end of the second switch unit is connected to the third port after being connected; one end of the third switch unit is connected to the first port or the second port, and the other end is connected to the fourth port.
  • the multi-port balance unit includes first and second switch units, one end of the first and second switch units are respectively connected to the first and second ports; the other end of the first switch unit It is connected to the second port, and the other end of the second switch unit is connected to the third port.
  • the multi-port balance unit includes first, second, and third switch units, one end of the first and second switch units are connected to the first and second ports respectively; The other end is connected to the second port, the other end of the second switch unit is connected to the third port, one end of the third switch unit is connected to the second port or the first port, and the other end is connected to the fourth port.
  • the multi-port balance unit includes a first switch unit, one end of the first switch unit is connected to the first port and the third port at the same time, and the other end is connected to the second port.
  • each switch unit in the bidirectional energy balance commutation chain includes a power semiconductor device or a mechanical switch.
  • each switch unit in the bidirectional energy balance commutation chain further includes a current-limiting unit composed of a current-limiting resistor, an inductor, a fuse, or any combination of the three devices, and the current-limiting unit is connected to the current-limiting unit.
  • the power semiconductor devices or mechanical switches in the switching unit are connected in series.
  • the power component in the power unit is composed of two fully-controlled power semiconductor devices in the form of half-bridge connection, or four fully-controlled power semiconductor devices in the form of full-bridge connection, or It is composed of a fully-controlled power semiconductor device in parallel with a buffer circuit, and the buffer circuit is composed of a diode and a capacitor in series.
  • the converter chain further includes at least one protection unit, the protection unit includes a protection resistor and a protection switch, connected in series at any position in the converter chain or connected in parallel at both ends of the first DC capacitor .
  • the protection unit includes a first protection switch and a first protection resistor, and the first protection switch and the first protection resistor are connected in parallel; wherein the first protection switch is connected in reverse direction with two anti-parallel connections.
  • the diode IGBT is connected in series with the mechanical switch.
  • the protection unit further includes a second protection switch, a second protection resistor, and a second DC capacitor; after the second DC capacitor is connected in series with the second protection switch and the second protection resistor, it is connected to the first The protection resistor and the first protection switch are connected in parallel.
  • the protection unit includes a second protection switch and a second protection resistor. After the second protection switch and the second protection resistor are connected in series, they are connected in parallel to both ends of the first DC capacitor.
  • the power unit further includes: a second bypass switch connected in parallel to the AC end of the power unit.
  • the bidirectional energy balance commutation chain further includes: at least one DC port connected to the positive and negative electrodes of the first DC capacitor; and the DC port is used to connect to the DC side of the converter unit or Lead out as a backup port.
  • the present invention also provides an electrical energy router, which includes at least three bidirectional energy balance commutation chains as described above.
  • the electrical energy router further includes K converter units, K is an integer greater than or equal to 1 and less than or equal to M, the input end of the converter unit is connected to the positive and negative electrodes of the first DC capacitor, and the output The load or power supply is terminated, and there is an isolation unit between the input end and the output end of the converter unit.
  • the electrical energy router has a DC positive pole and a DC negative pole, wherein the electrical energy router includes six bidirectional energy balance converter chains to form a three-phase upper bridge arm and a three-phase lower bridge arm;
  • the first power port of the bridge arm converter chain is connected to the DC positive pole, and the second power port of the upper bridge arm converter chain of the same phase is connected to the first power port of the lower bridge arm converter chain;
  • the three-phase lower bridge arm converter chain The second power port of is connected with the DC negative pole; the second power port of the three-phase upper bridge arm converter chain is led out as the AC terminal of the electric energy router.
  • the first balanced ports of the three-phase upper-arm converter chain of the electric energy router are connected together, and the second balanced ports of the three-phase lower-arm converter chain of the electric energy router are connected to Together.
  • the second balance port of the in-phase upper bridge arm converter chain of the electric energy router is connected to the first balance port of the lower bridge arm converter chain.
  • the electric energy router includes three bidirectional energy balance converter chains, the first power ports of the three converter chains are connected together, and the second power ports are respectively connected to the ABC three phases of the power grid; Or the second power ports of the three converter chains are connected together, and the first power ports are respectively connected to the ABC three phases of the power grid.
  • the first power ports of the three converter chains are connected together, the first balanced ports are connected together, and the second power ports are respectively connected to the ABC three phases of the power grid; or the three The second power ports of the two converter chains are connected together, and the second balance ports are connected together, and the first power ports are respectively connected to the ABC three phases of the power grid.
  • the electric energy router includes three bidirectional energy balance converter chains, the first power port of the converter chain and the second power port of the adjacent converter chain are connected to each other to form a closed loop;
  • the first power port or the second power port of the flow link is respectively connected to the ABC three phases of the power grid, forming an angular connection mode.
  • the first balance ports of the three converter chains and the second balance ports of the adjacent converter chains are connected to each other to form a closed loop.
  • the present invention also provides a method for controlling the above-mentioned two-way energy balance commutation chain, which includes:
  • the DC capacitor with a higher voltage is discharged to the DC capacitor of the adjacent power unit through the multi-port balance unit connected to the power unit.
  • the second bypass switch in the power unit is closed, and the first bypass switch is closed at the same time.
  • the technical solution provided by this application can realize the charge and discharge control of the adjacent power units of the converter chain in two directions through the cooperation of the switch unit in the multi-port balance unit and the power semiconductor devices in the power assembly, so as to ensure that each converter chain
  • the DC capacitor voltage of the power unit is balanced.
  • the power unit fails, the failed power unit and the corresponding multi-port balance unit can be bypassed without affecting the connection loop before the multi-port balance unit of the converter chain.
  • the added multi-port balance unit does not need to flow a large current, and can be realized by only adding a small cost.
  • FIG. 1A is one of the schematic diagrams of a two-way energy balance commutation chain provided by an embodiment of the present application;
  • FIG. 1B is the second schematic diagram of the structure of a two-way energy balance commutation chain provided by an embodiment of the present application;
  • FIG. 1C is the third schematic diagram of the structure of a two-way energy balance commutation chain provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the structure of a bidirectional energy balance commutation chain with a protection unit provided by an embodiment of the present application;
  • 3A is one of the schematic diagrams of the structure of a multi-port balance unit provided by an embodiment of the present application.
  • 3B is the second schematic diagram of the structure of a multi-port balance unit provided by an embodiment of the present application.
  • 3C is the third schematic diagram of the structure of the multi-port balance unit provided by the embodiment of the present application.
  • 3D is the fourth schematic diagram of the structure of the multi-port balance unit provided by the embodiment of the present application.
  • 3E is the fifth schematic diagram of the structure of the multi-port balance unit provided by the embodiment of the present application.
  • 3F is a sixth schematic diagram of the structure of a multi-port balance unit provided by an embodiment of the present application.
  • 3G is the seventh schematic diagram of the structure of the multi-port balance unit provided by the embodiment of the present application.
  • 3H is the eighth schematic diagram of the structure of a multi-port balance unit provided by an embodiment of the present application.
  • FIG. 3I is a ninth schematic diagram of the structure of a multi-port balance unit provided by an embodiment of the present application.
  • 3J is the tenth schematic diagram of the structure of the multi-port balance unit provided by the embodiment of the present application.
  • FIG. 4A is one of the schematic diagrams of the structure of the power unit provided by the embodiment of the present application.
  • 4B is the second schematic diagram of the structure of the power unit provided by the embodiment of the present application.
  • 4C is the third schematic diagram of the structure of the power unit provided by the embodiment of the present application.
  • FIG. 5A is one of the schematic diagrams of the structure of the protection unit provided by the embodiment of the present application.
  • FIG. 5B is the second schematic diagram of the structure of the protection unit provided by the embodiment of the present application.
  • 5C is the third schematic diagram of the structure of the protection unit provided by the embodiment of the present application.
  • Fig. 6 is a schematic diagram of the structure of a bidirectional energy-balanced converter chain with converter units provided by an embodiment of the present application
  • FIG. 7A is one of the schematic diagrams of the structure of an electric energy router provided by an embodiment of the present application.
  • FIG. 7B is the second schematic diagram of the structure of the electric energy router provided by the embodiment of the present application.
  • FIG. 7C is the third schematic diagram of the structure of the electric energy router provided by the embodiment of the present application.
  • the present invention provides a bidirectional energy balance converter chain 1, as shown in Fig. 1A, including:
  • the M power units include two AC terminals, the AC terminals of adjacent power units are sequentially connected in series, the empty port of the head end power unit is defined as the first power port D1, and the end power unit's The empty port lead is defined as the second power port D2;
  • the power unit includes a first DC capacitor and a power component connected in parallel, and M is an integer greater than or equal to 1;
  • N multi-port balance units 3, where N is an integer greater than or equal to 1 and less than or equal to M;
  • the number P of the ports of the multi-port balance unit is 3 or 4;
  • the first port of the head end multi-port balance unit is defined as the first balance port H1
  • the second port is connected to the first port of the adjacent multi-port balance unit, and is connected in this way.
  • the two-port lead is defined as the second balanced port H2.
  • the bidirectional energy balance commutation chain further includes a first bypass switch 4, which is connected in parallel between the first port and the second port of the multi-port balance unit.
  • the multi-port balance unit in the bidirectional energy balance commutation chain is used to control the charging and discharging between the first DC capacitors of adjacent power units.
  • the multi-port balance unit of the present invention has a variety of composition forms:
  • the multi-port balance unit includes first, second, third, and fourth switch units, one end of the first and second switch units are connected to the first and second ports respectively; the first and second switch units The other end of the switch unit is connected to the third port after being connected; one end of the third and fourth switch units is connected to the first port and the second port respectively, and the other end is connected to the fourth port.
  • the four switching units are respectively IGBTs with anti-parallel diodes, forming an H-bridge circuit.
  • the emitters of the first and second switching unit IGBTs are connected to the first and second ports respectively; the collectors of the first and second switching unit IGBTs are connected to the third port after being connected; the collectors of the third and fourth switching unit IGBTs are connected to the third port respectively.
  • the first and second ports are connected, and the emitter is connected to the fourth port.
  • the first and second switch units are respectively IGBTs with anti-parallel diodes, and the third and fourth switch units are respectively diodes to form an H-bridge circuit.
  • the collectors of the first and second switching unit IGBTs are connected to the first and second ports respectively; the emitters of the first and second switching unit IGBTs are connected to the third port after being connected; the cathodes of the third and fourth switching unit diodes are respectively connected to the first , The second port is connected, and the anode is connected to the fourth port.
  • the multi-port balance unit includes first and second switch units, one end of the first and second switch units are respectively connected to the first and second ports; the first switch unit and the second switch unit After the other end is connected, it is connected to the third port.
  • the two switching units are respectively IGBTs with anti-parallel diodes.
  • the collectors of the first and second switch units IGBT are connected to the first and second ports respectively; the emitters of the first and second switch units IGBT are connected to the third port after being connected.
  • the multi-port balance unit includes first, second, and third switch units, one end of the first and second switch units are respectively connected to the first and second ports; the first switch unit and the second switch The other end of the unit is connected to the third port after being connected; one end of the third switch unit is connected to the first port or the second port, and the other end is connected to the fourth port.
  • the first and second switch units are IGBTs with anti-parallel diodes
  • the third switch unit is a diode
  • the cathode of the diode is connected to the second port
  • the anode is connected to the fourth port.
  • the multi-port balance unit includes first and second switch units, one end of the first and second switch units are connected to the first and second ports respectively; the other end of the first switch unit is connected to the second The port is connected, and the other end of the second switch unit is connected to the third port.
  • the first and second switching units are IGBTs with anti-parallel diodes
  • the collector of the first switching unit IGBT is connected to the first port
  • the emitter of the IGBT is connected to the second switching unit.
  • the collector of the IGBT is connected to the second port
  • the emitter of the second switching unit IGBT is connected to the third port.
  • the multi-port balance unit includes first, second, and third switch units, one end of the first and second switch units are respectively connected to the first and second ports; the other end of the first switch unit is connected to the The second port is connected, the other end of the second switch unit is connected to the third port, one end of the third switch unit is connected to the second port or the first port, and the other end is connected to the fourth port.
  • the first and second switch units are IGBTs with anti-parallel diodes
  • the third switch unit is a diode
  • the collector of the first switch unit IGBT is connected to the first port
  • the emitter is connected to the collector of the second switching unit IGBT and connected to the second port.
  • the emitter of the second switching unit IGBT is connected to the third port; the cathode of the diode of the third switching unit is connected to the second port, and the anode is connected to the second port.
  • the multi-port balance unit includes a first switch unit, one end of the first switch unit is connected to the first port and the third port at the same time, and the other end is connected to the second port.
  • the first switching unit is an IGBT with an anti-parallel diode
  • the collector of the first switching unit IGBT is connected to the first port and the third port at the same time
  • the emitter is connected to the second port.
  • the first, second, third, and fourth switch units in the above-mentioned connection modes (1)-(6) may include unidirectional cut-off power semiconductor devices such as IGBTs with anti-parallel diodes, diodes, or bidirectional as shown in Figure 3H Cut-off power semiconductor devices.
  • the first, second, third, and fourth switch units may also include fast mechanical switches.
  • the first, second, third, and fourth switch units in the two-way energy balance commutation chain may also include a current-limiting unit composed of a current-limiting resistor, an inductor, a fuse, or any combination of the three devices, and the current-limiting unit is connected to the current-limiting unit.
  • the power semiconductor devices or mechanical switches in the switching unit are connected in series.
  • the second switching unit not only includes an IGBT with an anti-parallel diode, but also includes a current limiting resistor 14, an inductor 15 and a fuse 13 connected in series.
  • the above three devices can be combined arbitrarily.
  • the third port of the multi-port balance unit is connected to the anode of the first DC capacitor through an isolating switch 12.
  • the power components in the power unit described in this example are constructed in three ways:
  • Two fully-controlled power semiconductor devices are constructed in the form of half-bridge connection, as shown in Fig. 4A.
  • Two of the fully-controlled power semiconductor devices are IGBTs with anti-parallel diodes, respectively T1 and T2.
  • the collector of T1 is connected to the anode of the first DC capacitor C1
  • the collector of T2 is connected to the emitter of T1
  • T2 The emitter of C1 is connected to the negative pole of C1, and the emitter of T1 and T2 are led out as two AC terminals of the power unit.
  • the four fully-controlled power semiconductor devices are IGBTs with anti-parallel diodes, respectively T3-T6.
  • T3 and T4 form one bridge arm, and T5 and T6 form another bridge arm: the collector of T3 and the first The anode of the DC capacitor C1 is connected, the collector of T4 is connected to the emitter of T3, the emitter of T4 is connected to the cathode of C1; the collector of T5 is connected to the anode of the first DC capacitor C1, and the collector of T6 is connected to the emitter of T5 Pole connection, the emitter of T6 is connected to the negative pole of C1; the midpoint of the two bridge arms leads to the two AC terminals of the power unit.
  • the converter chain further includes at least one protection unit 6, and the protection unit includes a protection resistor and a protection switch, which are connected in series at any position in the converter chain or connected in parallel to both ends of the first DC capacitor.
  • the first protection switch 8 and the first protection resistor 11 are formed, and the first protection switch and the first protection resistor are connected in parallel.
  • the first protection switch is composed of two IGBTs with anti-parallel diodes connected in series in opposite directions and a mechanical switch in series.
  • the protection unit includes a second protection switch 9, a second protection resistor 10, and a second DC capacitor C2 in addition to the first protection switch 8 and the first protection resistor 11 After the second DC capacitor is connected in series with the second protection switch and the second protection resistor, it is connected in parallel with the first protection resistor and the first protection switch.
  • the protection unit includes a second protection switch 9 and a second protection resistor 10. After the second protection switch and the second protection resistor are connected in series, they are connected in parallel with the two first DC capacitors. end.
  • FIG. 2 is a schematic diagram of the structure of a bidirectional energy balance commutation chain with a protection unit provided by an embodiment of the application.
  • the power unit further includes: a second bypass switch 5 connected in parallel to the AC end of the power unit.
  • FIG. 1A is one of the schematic diagrams of the structure of a bidirectional energy balance commutation chain provided by an embodiment of the present application; in this embodiment, the multi-port balance unit is the structure shown in FIG. 3A, and the power unit is the structure shown in FIG. 4B.
  • FIG. 1B is the second schematic diagram of the structure of a bidirectional energy balancing commutation chain provided by an embodiment of the present application; in this embodiment, the multi-port balancing unit is the structure shown in FIG. 3H, and the power unit is the structure shown in FIG. 4A.
  • FIG. 1C is the third schematic diagram of the structure of a two-way energy balancing commutation chain provided by an embodiment of the present application; in this embodiment, the multi-port balancing unit is the structure shown in FIG. 3G, and the power unit is the structure shown in FIG. 4C.
  • the bidirectional energy balance commutation chain of this embodiment further includes at least one DC port connected to the anode and cathode of the first DC capacitor; the DC port is used to connect to the DC side of the converter unit or lead out as a backup port. As shown in FIG. 6, after the positive and negative poles of the first DC capacitor are led out, they are connected to the DC converter unit 20.
  • the bidirectional energy balance commutation chain of the present invention can constitute an electric energy router, and the electric energy router includes at least three bidirectional energy balance commutation chains.
  • the power router further includes K converter units, K is an integer greater than or equal to 1 and less than or equal to M.
  • K is an integer greater than or equal to 1 and less than or equal to M.
  • the input end of the converter unit is connected to the positive and negative electrodes of the first DC capacitor, and the output end is connected to the load or power supply.
  • K 2, including 2 converter units.
  • the electric energy router of the present invention is composed of the following several ways.
  • the electrical energy router has a DC positive pole and a DC negative pole, wherein the electrical energy router includes six bidirectional energy balance converter chains to form a three-phase upper bridge arm and a three-phase lower bridge arm;
  • the first power port of the upper bridge arm converter chain is connected to the DC positive pole, and the second power port of the same phase upper bridge arm converter chain is connected to the first power port of the lower bridge arm converter chain; three-phase lower bridge arm commutation
  • the second power port of the chain is connected with the DC negative pole; the second power port of the three-phase upper bridge arm converter chain is led out as the AC terminal of the electric energy router.
  • the first balanced ports of the three-phase upper-arm converter chain of the electric energy router are connected together, and the second balanced ports of the three-phase lower-arm converter chain of the electric energy router can be connected together.
  • the second balance port of the upper bridge arm converter chain of the same phase and the first balance port of the lower bridge arm converter chain of the electric energy router may be connected together.
  • the electrical energy router includes three bidirectional energy balance converter chains.
  • the first power ports of the three converter chains are connected together, the first balanced ports are connected together, and the second power The ports are respectively connected to the ABC three phases of the power grid; or the second power ports of the three converter chains are connected together, the second balance ports are connected together, and the first power ports are respectively connected to the ABC three phases of the power grid.
  • the electric energy router includes three bidirectional energy balance converter chains, the first power port of the converter chain and the second power port of the adjacent converter chain are connected to each other to form a closed loop;
  • the first power port of the converter chain is respectively connected to the ABC three phases of the power grid, forming an angular connection.
  • first balance ports of the three converter chains and the second balance ports of the adjacent converter chains are connected to each other to form a closed loop.
  • the present invention also provides a control method of the two-way energy balance commutation chain, including:
  • the DC capacitor with a higher voltage is discharged to the DC capacitor of the adjacent power unit through the multi-port balance unit connected to the power unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne une chaîne de conversion d'équilibrage d'énergie bidirectionnelle, comprenant M unités d'alimentation. Les M unités d'alimentation comprennent chacune deux bornes à courant alternatif, et les bornes à courant alternatif d'unités d'alimentation adjacentes sont connectées séquentiellement en série. L'invention comprend N unités d'équilibrage à ports multiples, N étant un nombre entier supérieur ou égal à 1 et inférieur ou égal à M ; le nombre P de ports des unités d'équilibrage à ports multiples est de 3 ou 4 ; quand P est égal à 3, les unités d'équilibrage à ports multiples comprennent chacune des premier à troisième ports, et le troisième port est connecté à une électrode positive ou à une électrode négative d'un premier condensateur à courant continu ; quand P est égal à 4, les unités d'équilibrage à ports multiples comprennent chacune des premier à quatrième ports ; le premier port de l'unité d'équilibrage à ports multiples au niveau d'une extrémité de tête mène à l'extérieur et est défini en tant que premier port d'équilibrage, et le second port est connecté au premier port de l'unité d'équilibrage à ports multiples adjacent au second port ; les ports restants sont séquentiellement connectés de cette manière ; le second port de l'unité d'équilibrage à ports multiples au niveau d'une extrémité de queue mène à l'extérieur et est défini en tant que second port d'équilibrage. La présente invention porte en outre sur un routeur d'énergie constitué de la chaîne de conversion d'équilibrage d'énergie bidirectionnelle, et sur un procédé de commande.
PCT/CN2020/140665 2020-02-13 2020-12-29 Chaîne de conversion d'équilibrage d'énergie bidirectionnelle, routeur d'énergie électrique et procédé de commande WO2021159873A1 (fr)

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CN202010089449.5A CN113258794B (zh) 2020-02-13 2020-02-13 一种双向能量均衡换流链、电能路由器及控制方法

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CN117134639A (zh) * 2023-10-27 2023-11-28 深圳市德兰明海新能源股份有限公司 换流桥臂电路控制方法、装置、电子设备和计算机设备
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CN114285004A (zh) * 2021-12-29 2022-04-05 浙江大学 一种抗短路故障和抑爆的功率器件
CN114285004B (zh) * 2021-12-29 2022-09-09 浙江大学 一种抗短路故障和抑爆的功率器件
WO2024061215A1 (fr) * 2022-09-20 2024-03-28 南京南瑞继保电气有限公司 Appareil d'interconnexion à courant alternatif flexible et procédé de commande de démarrage
CN117175920A (zh) * 2023-09-01 2023-12-05 国网经济技术研究院有限公司 一种应用于风电功率不匹配的高效率多端口直流变换器
CN117175920B (zh) * 2023-09-01 2024-03-01 国网经济技术研究院有限公司 一种应用于风电功率不匹配的高效率多端口直流变换器
CN117134639A (zh) * 2023-10-27 2023-11-28 深圳市德兰明海新能源股份有限公司 换流桥臂电路控制方法、装置、电子设备和计算机设备
CN117134639B (zh) * 2023-10-27 2024-02-13 深圳市德兰明海新能源股份有限公司 换流桥臂电路控制方法、装置、电子设备和计算机设备

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