WO2021139119A1 - Convertisseur hybride à coupure commandable côté courant alternatif, et procédé de commande - Google Patents

Convertisseur hybride à coupure commandable côté courant alternatif, et procédé de commande Download PDF

Info

Publication number
WO2021139119A1
WO2021139119A1 PCT/CN2020/099842 CN2020099842W WO2021139119A1 WO 2021139119 A1 WO2021139119 A1 WO 2021139119A1 CN 2020099842 W CN2020099842 W CN 2020099842W WO 2021139119 A1 WO2021139119 A1 WO 2021139119A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
auxiliary
series
branch
thyristor
Prior art date
Application number
PCT/CN2020/099842
Other languages
English (en)
Chinese (zh)
Inventor
高冲
盛财旺
魏晓光
张娟娟
周建辉
杨俊�
张静
李婷婷
Original Assignee
全球能源互联网研究院有限公司
国家电网有限公司
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 全球能源互联网研究院有限公司, 国家电网有限公司 filed Critical 全球能源互联网研究院有限公司
Publication of WO2021139119A1 publication Critical patent/WO2021139119A1/fr

Links

Images

Classifications

    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
    • H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • This application relates to the technical field of power electronic commutation, for example, to a hybrid converter with a controllable shutdown on the AC side and a control method.
  • Grid-commutated high voltage direct current (Line Commutated Converter High Voltage Direct Current, LCC-HVDC) transmission system has the advantages of long-distance large-capacity transmission and controllable active power, and is widely used worldwide.
  • the converter As the core equipment of DC transmission, the converter is the core functional unit to realize the conversion of AC and DC power. Its operational reliability largely determines the operational reliability of the UHV DC grid. Since most of the converters use semi-controlled device thyristors as the core components to form a six-pulse bridge commutation topology, each bridge arm is composed of multi-stage thyristors and their buffer components in series.
  • CCC Capacitor Commutation Converter
  • the controllable capacitor module is formed by the combination of power electronic switches and capacitors to realize the capacitor input and the controllable voltage direction. In order to achieve reliable commutation, the single-stage capacitor value If it is larger, it will increase the voltage and current stress of the thyristor, the core component of the valve.
  • the other is to form a hybrid converter by connecting a switchable device in series with a thyristor, so that each bridge arm of the converter has the ability to switch off, avoiding the occurrence of commutation failure. Due to the large transmission capacity of conventional DC transmission, the commutation Each bridge arm of the device bears high voltage and large current. In this topology, the shut-off pipe valve needs to be realized in a multi-stage series-parallel connection.
  • shut-off pipe valve can withstand large currents for a long time, and its loss is relatively large;
  • the high current is turned off, it bears higher voltage stress, and the number of series series increases; the engineering realization cost and difficulty of this kind of technical solution are relatively high.
  • This application provides a hybrid inverter with controllable shutdown on the AC side and a control method.
  • a bidirectional shutoff valve is introduced on the AC side to ensure that the thyristor valve has sufficient reverse recovery time to reliably shut down, and at the same time, an auxiliary valve is used to assist Commutation fundamentally solves the problem of commutation failure in the DC system.
  • the embodiment of the present application provides a hybrid converter with controllable shutdown on the AC side, including three parallel branches, three bidirectional shut-off valves, and a converter transformer;
  • Each branch is composed of parallel thyristor valve branch and auxiliary valve branch;
  • the thyristor valve branch is composed of two series-connected thyristor valves
  • the auxiliary valve branch is composed of two series-connected auxiliary valves with controllable shut-off of forward current and blocking capability of forward and reverse voltage;
  • connection point between the two series-connected thyristor valves is connected to one end of a two-way shut-off valve, and the other end of the two-way shut-off valve is respectively connected with the two series-connected forward current controllable shut-off valves.
  • the embodiment of the present application also provides a control method of a hybrid inverter with a controllable shutdown on the AC side, including:
  • the embodiment of the present application also provides another control method of a hybrid inverter with a controllable shutdown on the AC side, including:
  • the bidirectional shut-off valve connected to the i-th thyristor valve is turned off, and the auxiliary valve connected to the i-th thyristor valve is turned on;
  • ⁇ t′′ off is the length of time the i-th thyristor valve is in the positive blocking state in a control period
  • ⁇ t is the bidirectional shut-off valve connected to the i-th thyristor valve
  • T is a control period, i ⁇ [1,6].
  • FIG. 1 is a schematic diagram of a topological structure of a hybrid converter with a controllable shutdown on the AC side according to an embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of an auxiliary valve provided by an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of a bidirectional shut-off valve provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a buffer device provided by an embodiment of the present application.
  • FIG. 5 is a current flow path diagram of a hybrid converter topology with a controllable shutdown on the AC side according to an embodiment of the present application during normal operation;
  • FIG. 6 is a control sequence diagram of a hybrid converter topology with a controllable shutdown on the AC side provided by an embodiment of the present application during normal operation;
  • FIG. 7 is a current flow path diagram when the topology of a hybrid converter with a controllable shutdown on the AC side according to an embodiment of the present application fails;
  • FIG. 8 is a control sequence diagram of a hybrid converter with a controllable shutdown on the AC side according to an embodiment of the present application when the topology structure fails;
  • Fig. 9 is a control sequence diagram of a hybrid converter topology with controllable shutdown on the AC side provided by an embodiment of the present application.
  • This application provides a hybrid converter topology with controllable shutdown on the AC side.
  • the topology includes three parallel branches, three bidirectional shut-off valves, and a converter transformer. ;
  • Each branch is composed of parallel thyristor valve branch and auxiliary valve branch;
  • the thyristor valve branch is composed of two series-connected thyristor valves
  • the auxiliary valve branch is composed of two series-connected auxiliary valves with controllable shut-off of forward current and blocking capability of forward and reverse voltage;
  • connection point between the two series-connected thyristor valves is connected to one end of the two-way shut-off valve, and the other end of the two-way shut-off valve is connected to the connection point between the two series-connected auxiliary valves and the output end of the converter transformer. .
  • V11, V21, V31, V41, V51, and V61 are thyristor valves
  • V13, V23, V33, V43, V53, and V63 are auxiliary valves
  • V14, V36, and V52 are bidirectional shut-off valves.
  • the thyristor valve is composed of a plurality of thyristors and a buffer component connected in series or in parallel with each thyristor.
  • Each of the plurality of first auxiliary sub-modules connected in series is composed of buffer components connected in series or in parallel.
  • the first auxiliary sub-module is composed of a power module, or is composed of a power module and a diode connected in series with the power module.
  • the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and is not compatible with the A fully-controlled power electronic device with reverse voltage blocking capability is composed of anti-parallel diodes.
  • the fully-controlled power electronic device consists of an insulated gate bipolar transistor (IGBT), an integrated gate-commutated thyristor (IGCT), and an injection enhanced gate transistor (Injection Enhanced Gate Transistor). , IEGT), Gate Turn-Off Thyristor (GTO) and Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and other devices that can be turned off.
  • IGBT insulated gate bipolar transistor
  • IGCT integrated gate-commutated thyristor
  • IEGT injection enhanced gate transistor
  • GTO Gate Turn-Off Thyristor
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • the diode branch is composed of a plurality of forward-series diodes and a buffer component connected in series or in parallel with each of the plurality of forward-series diodes.
  • the auxiliary timing control branch is composed of a plurality of power modules connected in series and a buffer component connected in series or in parallel with each of the power modules connected in series.
  • the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and is not compatible with the A fully-controlled power electronic device with reverse voltage blocking capability is composed of anti-parallel diodes.
  • the fully-controlled power electronic device is composed of one or more of turn-off devices such as IGBT, IGCT, IEGT, GTO, and MOSFET.
  • the first power electronic unit is composed of a first auxiliary branch, a buffer component and a second auxiliary branch connected in parallel.
  • the first auxiliary branch and the second auxiliary branch are both composed of two sets of auxiliary timing control branches connected in series in a forward direction.
  • the auxiliary timing control branch is composed of a plurality of power modules connected in series and a buffer component connected in series or in parallel with each of the power modules connected in series.
  • the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and is not compatible with the A fully-controlled power electronic device with reverse voltage blocking capability is composed of anti-parallel diodes.
  • connection points of the two sets of auxiliary timing control branches of the first auxiliary branch and the connection points of the two sets of auxiliary timing control branches of the second auxiliary branch are both external connection points of the auxiliary valve or with the auxiliary valve.
  • the connection point of the other first power electronic unit in the valve is both external connection points of the auxiliary valve or with the auxiliary valve.
  • the fully-controlled power electronic device is composed of one or more of turn-off devices such as IGBT, IGCT, IEGT, GTO, and MOSFET.
  • the second power electronic unit is composed of a third auxiliary branch connected in parallel, an auxiliary timing control branch, a buffer component and a fourth auxiliary branch.
  • Both the third auxiliary branch and the fourth auxiliary branch are composed of two groups of diode branches connected in series in a forward direction.
  • the diode branch is composed of a plurality of forward-series diodes and a buffer component connected in series or in parallel with each of the plurality of forward-series diodes.
  • the auxiliary timing control branch is composed of a plurality of power modules connected in series and a buffer component connected in series or in parallel with each of the power modules connected in series.
  • the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and is not compatible with the A fully-controlled power electronic device with reverse voltage blocking capability is composed of anti-parallel diodes.
  • connection points of the two groups of diode branches of the third auxiliary branch and the connection points of the two groups of diode branches of the fourth auxiliary branch are both external connection points of the auxiliary valve or in the auxiliary valve Connection point for other second power electronic units.
  • the above-mentioned two-way shut-off valve consists of a first two-way shut-off valve branch and a second two-way shut-off valve branch in reverse series with the first two-way shut-off valve branch. It is composed of a branch circuit with a shut-off valve.
  • the first two-way shut-off valve branch and the second two-way shut-off valve branch are each composed of a plurality of second auxiliary sub-modules connected in series and each second auxiliary sub-module connected in series with each second Auxiliary sub-modules are composed of buffer components connected in series or in parallel.
  • the second auxiliary sub-module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability, and
  • the fully-controlled power electronic device without reverse voltage blocking capability is composed of a diode in reverse parallel connection and a buffer component connected in series or parallel with the fully-controlled power electronic device without reverse voltage blocking capability.
  • Figure 3 a shows the two structures of the two-way shut-off valve.
  • Fully-controlled power electronic devices are composed of one or more of the turn-off devices such as IGBT, IGCT, IEGT, GTO, and MOSFET.
  • the above-mentioned two-way shut-off valve consists of a third two-way shut-off valve branch, a fifth auxiliary branch, and a fourth two-way shut-off valve branch connected in parallel. composition.
  • the third two-way shut-off valve branch and the fourth two-way shut-off valve branch are both composed of two two-way shut-off valve timing control branches connected in series in a positive direction.
  • the two-way turn-off valve timing control branch is composed of a plurality of forward-series diodes and a buffer component connected in series or parallel with each forward-series diode.
  • the fifth auxiliary branch is composed of a plurality of second auxiliary submodules connected in series and a buffer component connected in series or in parallel with each of the plurality of second auxiliary submodules connected in series.
  • the second auxiliary sub-module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability, and
  • the fully-controlled power electronic device without reverse voltage blocking capability is composed of a diode in reverse parallel connection and a buffer component connected in series or parallel with the fully-controlled power electronic device without reverse voltage blocking capability.
  • the external connection points of the third two-way shut-off valve branch and the external connection points of the fourth two-way shut-off valve branch are respectively two diode timing control branches of the third two-way shut-off valve branch The connection point of and the connection point of the two diode timing control branches of the fourth bidirectional shut-off valve branch.
  • Fully-controlled power electronic devices are composed of one or more of the turn-off devices such as IGBT, IGCT, IEGT, GTO, and MOSFET.
  • the two-way shut-off valve is composed of two fifth two-way shut-off valve branches connected in anti-parallel.
  • the fifth bidirectional shut-off valve branch is composed of a plurality of full-control power electronic devices connected in series in a forward direction and a buffer component connected in series or in parallel with each full-control power electronic device.
  • the two-way shut-off valve is composed of multiple power device modules connected in series.
  • the power device module is composed of two anti-parallel fully-controlled power electronic devices and a buffer component connected in series or in parallel with each fully-controlled power electronic device.
  • the buffer component is composed of one or more of capacitors, resistance-capacitance circuits, diodes, inductors, and arresters in series or in parallel.
  • diodes are not used, that is, the two structures do not include the structure of the fully-controlled power electronic device and the diode in series or parallel.
  • the fully-controlled power electronic device is composed of one or more of turn-off devices such as IGBT, IGCT, IEGT, GTO, and MOSFET.
  • the embodiment of the present application also provides a method for controlling the topology structure as described above, and the method includes:
  • Step 1 Turn on the i-th thyristor valve, and go to step 2.
  • Step 2 Return to step 1 after a control period T; where i ⁇ [1,6].
  • Control sequence where Sg1 is the control sequence of the thyristor valve, Sg12 is the control sequence of the bidirectional shut-off valve, Sg13 is the control sequence of the auxiliary valve, t 0 is the initial trigger time, ⁇ t on is the conduction time of the thyristor valve, ⁇ t off is the off time of the thyristor valve, ⁇ t' off is the positive blocking time of the thyristor valve, and the control period T is 2 ⁇ .
  • the auxiliary valve receives the trigger signal and turns on, and then the two-way shut-off valve receives the signal to turn off, completing the main branch to the auxiliary valve.
  • Valve commutation process FIG. 7 b shows the main branch to close the auxiliary valve flow stage, at this stage the main branch has been completely shut off, all the current is transferred to the auxiliary valve;
  • Figure 7 c shows the main branch And the auxiliary valve shut-off stage, at this stage the auxiliary valve receives the shut-off signal and shuts off the auxiliary valve.
  • the thyristor valve is in a positive blocking state to withstand the forward voltage.
  • Figure 8 shows the control sequence of multiple valves when a commutation failure or short circuit fault is detected.
  • Sg1 is the control sequence of the thyristor valve
  • Sg12 is the control sequence of the bidirectional shut-off valve
  • Sg13 is the control sequence of the auxiliary valve
  • t 1 is the initial trigger time
  • the control period T is 2 ⁇
  • ⁇ t 1 is the delay time for turning on the auxiliary valve of the i-th bridge arm
  • ⁇ t 2 is the delay for turning off the bidirectional shut-off valve connected to the i-th bridge arm.
  • ⁇ t 3 is the on-time of the auxiliary valve.
  • the period from the main branch current zero crossing to the closing of the auxiliary valve is the off time ⁇ t of the thyristor valve off , ⁇ t off must be greater than the minimum preset off time.
  • Step S1 is executed after the end of the control period in which t f is located, and until the voltage of the hybrid converter topology is restored to stability, the bidirectional shut-off valve connected to the i-th thyristor valve is turned on, and the i-th thyristor valve is turned off. A thyristor valve is connected to the auxiliary valve, and step 1 is performed.
  • Step S1 Turn on the i-th thyristor valve, turn on the bidirectional shut-off valve connected to the i-th thyristor valve, turn off the auxiliary valve connected to the i-th thyristor valve, and perform step S2 after ⁇ t.
  • Step S2 Turn off the bidirectional shut-off valve connected to the i-th thyristor valve, and turn on the auxiliary valve connected to the i-th thyristor valve.
  • step S3 is executed.
  • Step S3 Turn off the auxiliary valve connected to the i-th thyristor valve, and return to step S1 after ⁇ t' off.
  • ⁇ t' off is the length of time that the i-th thyristor valve is in the positive blocking state in a control cycle from step 1 to step 2
  • ⁇ t 1 is the delay time of turning on the auxiliary valve connected to the i-th thyristor valve
  • ⁇ t 2 Is the delay time for shutting off the bidirectional shut-off valve connected to the i-th thyristor valve
  • ⁇ t is the conduction time of the bidirectional shut-off valve connected to the i-th thyristor valve
  • T is a control period
  • This application also provides another method for controlling the topology structure as described above. As shown in FIG. 9, the method includes:
  • Step T1 Turn on the i-th thyristor valve of the hybrid converter topology, turn on the bidirectional shut-off valve connected to the i-th thyristor valve, turn off the auxiliary valve connected to the i-th thyristor valve, and pass ⁇ t After that, step T2 is executed,
  • Step T2 Turn off the bidirectional shut-off valve connected to the i-th thyristor valve, and turn on the auxiliary valve connected to the i-th thyristor valve.
  • step T3 is executed.
  • Step T3 Turn off the auxiliary valve connected to the i-th thyristor valve, after ⁇ t′′ off , return to Step T1.
  • ⁇ t′′ off is the length of time that the i-th thyristor valve is in the positive blocking state in a control cycle
  • ⁇ t is the bidirectional shut-off valve connected to the i-th thyristor valve
  • T is a control period, i ⁇ [1,6].
  • Sg1 is the control sequence of the thyristor valve
  • Sg12 is the control sequence of the shut-off valve
  • Sg13 is the control sequence of the auxiliary valve
  • ⁇ t on is the conduction time of the thyristor valve
  • ⁇ t′′ off is the forward resistance of the thyristor valve.
  • the off time, the control period T is 2 ⁇
  • ⁇ t is the on-time length of the shut-off valve
  • ⁇ t13 is the on-time of the auxiliary valve.
  • the period from the zero current of the main branch circuit to the closing of the auxiliary valve is the off time ⁇ t off of the thyristor valve, and ⁇ t off must be greater than the minimum preset off time.
  • An AC-side controllable shut-off hybrid converter topology includes three parallel branches, three bidirectional shut-off valves, and a converter transformer; each branch has a parallel thyristor valve A branch circuit and an auxiliary valve branch circuit; the thyristor valve branch circuit is composed of two thyristor valves connected in series, and the auxiliary valve branch circuit is composed of two series-connected thyristor valves with controllable shut-off of forward current and blocking capability of forward and reverse voltages.
  • Auxiliary valve composition the connection point between two series-connected thyristor valves is connected to one end of the two-way shut-off valve, and the other end of the two-way shut-off valve is connected to the connection point between the two series-connected auxiliary valves and the converter transformer
  • the output terminal is connected;
  • the hybrid converter topology provided by the embodiment of this application introduces a bidirectional shut-off valve on the AC side to ensure that the thyristor valve has enough reverse recovery time to reliably shut down, and at the same time, an auxiliary valve is used to assist the commutation
  • the problem of commutation failure in the DC system is fundamentally solved; in this structure, the auxiliary valve can quickly transfer the phase current and flexibly control the commutation time area of the thyristor valve.
  • the valve current quickly transfers to the auxiliary valve and passes the full
  • the high-current turn-off characteristics of the controlled device can quickly restore the commutation between the two bridge arms, which greatly accelerates the recovery time of the converter after the commutation fails;
  • the bidirectional shut-off valve can shut off the valve side current in advance, and it is a thyristor at the same time
  • the valve provides reverse voltage, which increases the area of the thyristor valve commutation time, and ensures the reliable shutdown of the thyristor valve.
  • the two-way shut-off valve only needs to be arranged on each phase of the three-phase AC bus, and the number of series is less.
  • the utilization rate is high, and the total loss generated is low; in addition, the structure can be put into use at any time auxiliary valve, which can effectively reduce the loss of thyristor valve, can achieve low voltage and low shut-off angle operation, and greatly reduce the inverter side Reactive power; in the first control method provided by the embodiments of this application, during normal operation, the auxiliary valve is not put into operation, but only needs to bear the voltage stress, and will not negatively affect the various operating conditions of the converter valve; Immediately after the failure or short-circuit fault occurs, the auxiliary valve is put into operation to realize the auxiliary commutation function in a short period of time, and quickly restore the commutation between multiple bridge arms.
  • the second control method provided by the embodiment of the application is a two-way shut-off valve connected to a thyristor valve Alternate operation mode with auxiliary valve, this operation mode can avoid the occurrence of failure failure or short circuit failure, which is beneficial to improve the overall reliability of the converter.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may use one or more computer-usable storage media containing computer-usable program codes, including but not limited to disk storage, compact disc read-only memory (CD-ROM), optical storage, etc. In the form of a computer program product implemented on it.
  • CD-ROM compact disc read-only memory
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Conversion In General (AREA)

Abstract

L'invention concerne un convertisseur hybride à coupure commandable côté courant alternatif, et un procédé de commande. Le convertisseur hybride à coupure commandable côté courant alternatif comprend trois branches parallèles, trois valves de coupure bidirectionnelle, et un transformateur de convertisseur ; chaque branche est constituée d'une branche à valves à thyristor et d'une branche à valves auxiliaires qui sont connectées en parallèle ; la branche à valves à thyristor est constituée de deux valves à thyristor connectées en série, et la branche à valves auxiliaires est constituée de deux valves auxiliaires connectées en série et ayant la capacité de coupure commandable d'un courant direct et la capacité de blocage de tensions directe et inverse ; un point de connexion entre les deux valves à thyristor connectées en série est connecté à une borne d'une valve de coupure commandable bidirectionnelle, et l'autre borne de la valve de coupure commandable bidirectionnelle est connectée à un point de connexion entre les deux valves auxiliaires connectées en série et ayant la capacité de coupure commandable d'un courant direct et la capacité de blocage de tensions directe et inverse, ainsi qu'à une borne de sortie du transformateur de convertisseur.
PCT/CN2020/099842 2020-01-10 2020-07-02 Convertisseur hybride à coupure commandable côté courant alternatif, et procédé de commande WO2021139119A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010027411.5 2020-01-10
CN202010027411.5A CN113131763A (zh) 2020-01-10 2020-01-10 一种交流侧可控关断的混合式换流器拓扑结构及控制方法

Publications (1)

Publication Number Publication Date
WO2021139119A1 true WO2021139119A1 (fr) 2021-07-15

Family

ID=76770897

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/099842 WO2021139119A1 (fr) 2020-01-10 2020-07-02 Convertisseur hybride à coupure commandable côté courant alternatif, et procédé de commande

Country Status (2)

Country Link
CN (1) CN113131763A (fr)
WO (1) WO2021139119A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986178A (zh) * 2014-05-09 2014-08-13 华北电力大学 一种lcc-hvdc拓扑结构及其可控子模块充电初始电压确定方法
CN106026012A (zh) * 2016-06-29 2016-10-12 中国西电电气股份有限公司 一种混合式有源型高压直流断路器
CN108712090A (zh) * 2018-07-03 2018-10-26 清华大学 一种高压直流输电混合换流器
CN109742783A (zh) * 2018-11-14 2019-05-10 南京南瑞继保电气有限公司 混合直流输电系统电压源型换流器在线退出方法及装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986178A (zh) * 2014-05-09 2014-08-13 华北电力大学 一种lcc-hvdc拓扑结构及其可控子模块充电初始电压确定方法
CN106026012A (zh) * 2016-06-29 2016-10-12 中国西电电气股份有限公司 一种混合式有源型高压直流断路器
CN108712090A (zh) * 2018-07-03 2018-10-26 清华大学 一种高压直流输电混合换流器
CN109742783A (zh) * 2018-11-14 2019-05-10 南京南瑞继保电气有限公司 混合直流输电系统电压源型换流器在线退出方法及装置

Also Published As

Publication number Publication date
CN113131763A (zh) 2021-07-16

Similar Documents

Publication Publication Date Title
WO2021022953A1 (fr) Convertisseur hybride basé sur un arrêt commandable et son procédé de commande
US10797487B2 (en) On-line input control method, on-line input and quit device for voltage-source converter unit
WO2014183453A1 (fr) Convertisseur et son procédé de commande
WO2022160929A1 (fr) Unité de commutation active, structure topologique de convertisseur hybride à commutation forcée et procédé
CN105634026A (zh) 一种基于反并联晶闸管全桥子模块换流器的电网换相换流器结构
CN112803798A (zh) 主动换相单元、强迫换相的混合式换流器拓扑结构及方法
Li et al. Active-forced-commutated bridge using hybrid devices for high efficiency voltage source converters
CN112311273B (zh) 一种基于谐振回路的混合式换流器拓扑结构及其控制方法
WO2022160927A1 (fr) Structure de topologie de convertisseur hybride à commutation auxiliaire de bus commun côté courant continu et procédé associé
WO2022160930A1 (fr) Structure de topologie de convertisseur hybride à commutation active et son procédé de commande
WO2022160791A1 (fr) Structure topologique d'un convertisseur hybride et son procédé de commande
CN108616223B (zh) 一种基于igct的模块化多电平换流器及故障处理方法
WO2021139119A1 (fr) Convertisseur hybride à coupure commandable côté courant alternatif, et procédé de commande
CN214380680U (zh) 主动换相单元及强迫换相的混合式换流器拓扑结构
CN114257104A (zh) 主动换相单元以及强迫换相的混合式换流器拓扑结构
CN214380688U (zh) 一种混合式换流器拓扑结构
CN112803797A (zh) 直流侧辅助换相的混合式换流器拓扑结构及其控制方法
CN214380681U (zh) 交流侧可控关断的混合式换流器拓扑结构
CN112311272A (zh) 一种直流侧辅助换相的混合式换流器拓扑结构及其控制方法
CN214256147U (zh) 主动换相单元及强迫换相的混合式换流器拓扑结构
CN107645291B (zh) 一种igbt模块级联的单向直流断路器及其应用方法
CN112310993B (zh) 一种强迫换流的混合式换流器拓扑结构及其控制方法
CN216390813U (zh) 一种主动换相单元以及混合式换流器拓扑结构
CN216451292U (zh) 主动换相单元及混合式换流器拓扑结构
WO2023217218A1 (fr) Circuit parallèle à double convertisseur, procédé et dispositif de commande associés, et système de transmission de puissance à courant continu

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20911363

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20911363

Country of ref document: EP

Kind code of ref document: A1