CN104601017A - Modularized multi-level converter being able to traverse direct current short circuit fault - Google Patents

Modularized multi-level converter being able to traverse direct current short circuit fault Download PDF

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Publication number
CN104601017A
CN104601017A CN201410827384.4A CN201410827384A CN104601017A CN 104601017 A CN104601017 A CN 104601017A CN 201410827384 A CN201410827384 A CN 201410827384A CN 104601017 A CN104601017 A CN 104601017A
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gate
switch device
controlled switch
fly
wheel diode
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CN104601017B (en
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于心宇
魏应冬
姜齐荣
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Tsinghua University
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Tsinghua University
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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
    • 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
    • H02M7/21—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 triode or transistor type requiring continuous application of a control signal
    • H02M7/217—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a mixed type modularized multi-level converter being able to traverse direct current short circuit fault based on novel clamping submodule, and belongs to the field of power electronic technology and electricity transmission and distribution. The provided novel clamping submodule is able to provide a negative voltage on the passage of the direct current short circuit fault current, thus being beneficial to quickly attenuating the fault current. The provided converter consists of three phases; each phase comprises upper and lower two bridge arms; each bridge arm consists of a plurality of half-bridge submodules, a plurality of clamping submodules and a filter inductor which are connected in series. In the provided modularized multi-level converter structure being able to traverse direct current short circuit fault, the half-bridge submodules and the clamping submodules are cascaded in a mixed type, thus the automatic zero clearing of the direct current short circuit fault current can be achieved with a lower cost; the modularized multi-level converter being able to traverse direct current short circuit fault has the advantages of low cost, fast in fault current clearing speed, free of capacitor voltage balancing problems inside the submodules, and the like.

Description

A kind of modular multi-level converter passing through direct-current short circuit fault
Technical field
The present invention relates to a kind of modular multi-level converter passing through direct-current short circuit fault, belong to power electronic technology and electrical power distribution electrical domain.
Background technology
Compared with traditional high voltage dc transmission technology, flexible high pressure HVDC Transmission Technology adopts the control of full control switching device realization to current transformer, thus have and control flexible, idlely can freely compensate and not rely on AC system and realize the advantages such as commutation, obtaining investigation and application widely in recent years.Especially based on the flexible high pressure DC transmission system of modular multi-level converter structure, many places engineering has been had to put into operation or build at home and abroad.
A kind of catastrophe failure type must considered when direct-current short circuit fault is flexible DC power transmission engineering design operation.But for adopting the current transformer of half-bridge sub modular structure, when DC side is short-circuited fault, anti-paralleled diode in half-bridge submodule easily forms fault point and is fed to loop with the energy that AC system is directly communicated with, and makes current transformer cannot be realized the removing of DC side fault current by the action of its own switch device.For realizing removing to direct-current short circuit fault current, existing document and patent discloses multiple improvement project, wherein by adopting novel sub modular structure to realize, scheme that direct-current short circuit fault current removes has economy and feasibility most.Such as, application number is 201310470755.3, name is called that the Chinese patent of " a kind of modular multi-level converter unsteady flow modular circuit with short-circuit protection " discloses a kind of sub modular structure, this structure is by increasing gate-controlled switch device and clamping diode in submodule inside, make single submodule can provide self back-pressure of forward rated voltage half, thus fault current removing can be realized, but there is multiple electric capacity due to submodule inside in this structure, and only have the electric capacity of half quantity to be charged after a failure, thus there is the unbalanced problem of submodule internal capacitance voltage.
Summary of the invention
The object of the invention is to propose a kind of modular multi-level converter passing through direct-current short circuit fault, the structure of existing modular multi-level converter is improved, by half-bridge sub modular structure and Yi Zhong Clamp-on bit submodule structure Mixed cascading, the mixed proportion of two seed module can be selected according to cost and blocking time flexibly, thus realize the quick removing of direct-current short circuit fault current with lower cost.The electric capacity of Gai Clamp-on bit submodule inside of You Yu all can be charged after failure locking, thus can not there is the unbalanced problem of submodule internal capacitance voltage.
The modular multi-level converter of the passed through direct-current short circuit fault that the present invention proposes, by A phase, B phase and C phase composition, often to be in series by upper brachium pontis and lower brachium pontis, the positive terminal of upper brachium pontis is this phase DC side positive terminal, lower brachium pontis negative pole end is this phase DC side negative pole end, and the tie point of upper brachium pontis negative pole end and lower brachium pontis positive terminal is this cross streams side; Three-phase dc side anode connects together, and becomes the DC side positive pole of the modular multi-level converter that can pass through direct-current short circuit fault; Three-phase dc side negative terminal connects together, and forms the DC side negative pole that can pass through the modular multi-level converter of direct-current short circuit fault; The interchange side of each phase of current transformer respectively phase line end each with AC electrical network is connected;
Described upper brachium pontis and lower brachium pontis are in series with any order by L half-bridge submodule, a M Clamp-on bit submodule and a filter reactor, and wherein L+2M+1 equals the level number of the modular multi-level converter that can pass through direct-current short circuit fault, M>=U lm/ (4U c), U lmfor the modular multi-level converter that can pass through direct-current short circuit fault exchanges side line voltage magnitude, U cfor the rated voltage of the modular multi-level converter half-bridge submodule of direct-current short circuit fault can be passed through;
Described clamp submodule, comprises the first direct current capacitor, the second direct current capacitor, the first gate-controlled switch device, the second gate-controlled switch device, the 3rd gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the 6th gate-controlled switch device, the first fly-wheel diode, the second fly-wheel diode, the 3rd fly-wheel diode, the 4th fly-wheel diode, the 5th fly-wheel diode, the 6th fly-wheel diode, the first catching diode and the second catching diode, the collector electrode of described first gate-controlled switch device, the collector electrode of the second gate-controlled switch device, the collector electrode of the 3rd gate-controlled switch device, the collector electrode of the 4th gate-controlled switch device, the collector electrode of the 5th gate-controlled switch device and the collector electrode of the 6th gate-controlled switch device respectively with the negative electrode of the first described fly-wheel diode, the negative electrode of the second fly-wheel diode, the negative electrode of the 3rd fly-wheel diode, the negative electrode of the 4th fly-wheel diode, the negative electrode of the 5th fly-wheel diode is connected with the negative electrode of the 6th fly-wheel diode, the emitter of the first described gate-controlled switch device, the emitter of the second gate-controlled switch device, the emitter of the 3rd gate-controlled switch device, the emitter of the 4th gate-controlled switch device, the emitter of the 5th gate-controlled switch device, the emitter of the 6th gate-controlled switch device respectively with the anode of the first described fly-wheel diode, the anode of the second fly-wheel diode, the anode of the 3rd fly-wheel diode, the anode of the 4th fly-wheel diode, the anode of the 5th fly-wheel diode, the anode of the 6th fly-wheel diode is connected, the collector electrode of the first described gate-controlled switch device is connected with the positive terminal of the first direct current capacitor with the negative electrode of the first clamping diode simultaneously, the emitter of the first gate-controlled switch device is connected with the collector electrode of the second gate-controlled switch device, as the positive terminal of clamp submodule, the emitter of the second described gate-controlled switch device is connected with the negative pole of the first direct current capacitor with the emitter of the 3rd gate-controlled switch device simultaneously, and the collector electrode of the 3rd described gate-controlled switch device is connected with the negative electrode of the second catching diode with the anode of the first clamping diode, the emitter of the 4th gate-controlled switch device simultaneously, the collector electrode of the 6th described gate-controlled switch device is connected with the positive pole of the second direct current capacitor with the collector electrode of the 4th gate-controlled switch device simultaneously, the emitter of the 5th described gate-controlled switch device is connected with the negative pole of the second DC capacitor with the anode of bis-Clamp-on position diode simultaneously, the collector electrode of the 5th described gate-controlled switch device is connected with the emitter of the 6th gate-controlled switch device, as the negative pole end of clamp submodule.
The modular multi-level converter of the passed through direct-current short circuit fault that the present invention proposes, its advantage is:
By half-bridge sub modular structure and Xin Xing Clamp-on bit submodule structure Mixed cascading, the automatic clear of direct-current short circuit fault current can be realized with lower cost.Owing to adopting Mixed cascading structure, half-bridge submodule number L is Yu the ratio of Clamp-on bit submodule number M can according to reducing costs, reducing the demand flexible design such as fault current checkout time.For the current transformer that the present invention proposes, work as L/M=0, when namely adopting Xin Xing Clamp-on bit submodule completely, its fault current checkout time is the shortest, compared with adopting the modular multi-level converter of full-bridge submodule completely, fault current knows that the time is substantially suitable, but the current transformer three-phase that the present invention proposes saves 12M IGBT altogether; Along with the increase of L/M ratio, needed for the current transformer that the present invention proposes, IGBT and number of diodes reduce further, as L/M=2, compared with adopting the modular multi-level converter of clamp Shuangzi module completely, its fault current checkout time is substantially suitable, but the current transformer three-phase that the present invention proposes saves 6L clamping diode altogether, and installation cost is lower.The ratio of suitable increase L/M, can reduce fault current and reset the time, contribute to modular multi-level converter fast quick-recovery normal operating conditions when impermanency short trouble.Be 201310470755.3 with application number, name is called compared with the sub modular structure that the Chinese patent of " a kind of modular multi-level converter unsteady flow modular circuit with short-circuit protection " proposes; there is not inside modules capacitor voltage equalizing problem in the converter structure that the present invention proposes, therefore can not cause capacitance damage because repeatedly fault postfactor inside modules capacitance voltage is uneven.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the modular multi-level converter of the passed through direct-current short circuit fault that the present invention proposes.
Fig. 2 is the structural representation of upper brachium pontis and lower brachium pontis in the modular multi-level converter shown in Fig. 1.
Fig. 3 is the structural representation of the clamp submodule in the upper brachium pontis shown in Fig. 2 and lower brachium pontis.
Fig. 4 is the change curve of modular multi-level converter fault current before and after dc-side short-circuit fault that the present invention proposes.
Embodiment
The modular multi-level converter of the passed through direct-current short circuit fault that the present invention proposes, its circuit theory diagrams as shown in Figure 1, by A phase, B phase and C phase composition, often to be in series by upper brachium pontis and lower brachium pontis, the positive terminal of upper brachium pontis is this phase DC side positive terminal, lower brachium pontis negative pole end is this phase DC side negative pole end, and the tie point of upper brachium pontis negative pole end and lower brachium pontis positive terminal is this cross streams side; Three-phase dc side anode connects together, and becomes the DC side positive pole DC+ of the modular multi-level converter that can pass through direct-current short circuit fault; Three-phase dc side negative terminal connects together, and forms the DC side negative pole DC-that can pass through the modular multi-level converter of direct-current short circuit fault; Interchange side Ac, Bc, Cc of each phase of current transformer are connected with AC electrical network each phase line end Ag, Bg, Cg respectively;
Upper brachium pontis in above-mentioned modular multi-level converter and lower brachium pontis, its circuit theory diagrams as shown in Figure 2, be in series with any order by L half-bridge submodule, a M Clamp-on bit submodule and a filter reactor, wherein L+2M+1 equals the level number of the modular multi-level converter that can pass through direct-current short circuit fault, M>=U lm/ (4U c), U lmfor the modular multi-level converter that can pass through direct-current short circuit fault exchanges side line voltage magnitude, U cfor the rated voltage of the modular multi-level converter half-bridge submodule of direct-current short circuit fault can be passed through.
Clamp submodule in above-mentioned upper brachium pontis and lower brachium pontis, its circuit theory diagrams as shown in Figure 3, comprise the first direct current capacitor C 1, the second direct current capacitor C 2, the first gate-controlled switch device T 1, the second gate-controlled switch device T 2, the 3rd gate-controlled switch device T 3, the 4th gate-controlled switch device T 4, the 5th gate-controlled switch device T 5, the 6th gate-controlled switch device T 6, the first sustained diode 1, the second sustained diode 2, the 3rd sustained diode 3, the 4th sustained diode 4, the 5th sustained diode 5, the 6th sustained diode 6, the first catching diode D c1with the second catching diode D c2; Described first gate-controlled switch device T 1collector electrode, the second gate-controlled switch device T 2collector electrode, the 3rd gate-controlled switch device T 3collector electrode, the 4th gate-controlled switch device T 4collector electrode, the 5th gate-controlled switch device T 5collector electrode and the 6th gate-controlled switch device T 6collector electrode respectively with the first described sustained diode 1negative electrode, the second sustained diode 2negative electrode, the 3rd sustained diode 3negative electrode, the 4th sustained diode 4negative electrode, the 5th sustained diode 5negative electrode and the 6th sustained diode 6negative electrode be connected; The first described gate-controlled switch device T 1emitter, the second gate-controlled switch device T 2emitter, the 3rd gate-controlled switch device T 3emitter, the 4th gate-controlled switch device T 4emitter, the 5th gate-controlled switch device T 5emitter, the 6th gate-controlled switch device T 6emitter respectively with the first described sustained diode 1anode, the second sustained diode 2anode, the 3rd sustained diode 3anode, the 4th sustained diode 4anode, the 5th sustained diode 5anode, the 6th sustained diode 6anode be connected; The first described gate-controlled switch device T 1collector electrode simultaneously with the first clamping diode D c1negative electrode and the first direct current capacitor C 1positive terminal be connected, the first gate-controlled switch device T 1emitter and the second gate-controlled switch device T 2collector electrode be connected, as clamp submodule positive terminal+; The second described gate-controlled switch device T 2emitter simultaneously with the 3rd gate-controlled switch device T 3emitter and the first direct current capacitor C 1negative pole be connected, the 3rd described gate-controlled switch device T 3collector electrode simultaneously with the first clamping diode D c1anode, the 4th gate-controlled switch device T 4emitter and the second catching diode D c2negative electrode be connected; The 6th described gate-controlled switch device T 6collector electrode simultaneously with the 4th gate-controlled switch device T 4collector electrode and the second direct current capacitor C 2positive pole be connected; The 5th described gate-controlled switch device T 5emitter simultaneously with bis-Clamp-on position diode D c2anode and the second DC capacitor C 2negative pole be connected; The 5th described gate-controlled switch device T 5collector electrode and the 6th gate-controlled switch device T 6emitter be connected, as clamp submodule negative pole end-.
The present invention propose modular multi-level converter when normally running, the 3rd controllable devices T in all clamp submodules 3with the 4th gate-controlled switch device T 4control signal be high level, make T 3and T 4conducting always; When current transformer dc-side short-circuit fault being detected, the control signal of all gate-controlled switch devices is low level, makes all gate-controlled switch devices all be in blocking, and after this short circuit current can decline rapidly, thus each electric device of available protecting is not damaged.
For the three-phase modular multilevel rectifier being applied to three-phase alternating current electrical network, specific embodiments of the invention are described below.
In this embodiment, the parameter of 9 level three-phase modular multilevel current transformers sees the following form.
In the present embodiment, before t=0.5s, current transformer normally works, the 3rd controllable devices T in all clamp submodules 3with the 4th controllable devices T 4control signal be high level, make T 3and T 4conducting always; When t=0.5s, current transformer DC side is short-circuited fault, detect that DC side electric current reaches action threshold value 0.75kA at t=0.5026s, converter control system is low level to the control signal of gate-controlled switch device in all submodules, makes all gate-controlled switch devices all be in blocking.Fig. 4 gives the situation of change of DC side electric current before and after dc-side short-circuit fault, and as seen after each gate-controlled switch device of t=0.5026s current transformer locking, short circuit current declines rapidly, drops to 0 when t=0.5062s, achieves the automatic removing of fault current.

Claims (1)

1. one kind can be passed through the modular multi-level converter of direct-current short circuit fault, it is characterized in that this modular multi-level converter is by A phase, B phase and C phase composition, often to be in series by upper brachium pontis and lower brachium pontis, the positive terminal of upper brachium pontis is this phase DC side positive terminal, lower brachium pontis negative pole end is this phase DC side negative pole end, and the tie point of upper brachium pontis negative pole end and lower brachium pontis positive terminal is this cross streams side; Three-phase dc side anode connects together, and becomes the DC side positive pole of the modular multi-level converter that can pass through direct-current short circuit fault; Three-phase dc side negative terminal connects together, and forms the DC side negative pole that can pass through the modular multi-level converter of direct-current short circuit fault; The interchange side of each phase of current transformer respectively phase line end each with AC electrical network is connected;
Described upper brachium pontis and lower brachium pontis are in series with any order by L half-bridge submodule, a M Clamp-on bit submodule and a filter reactor, and wherein L+2M+1 equals the level number of the modular multi-level converter that can pass through direct-current short circuit fault, M>=U lm/ (4U c), U lmfor the modular multi-level converter that can pass through direct-current short circuit fault exchanges side line voltage magnitude, U cfor the rated voltage of the modular multi-level converter half-bridge submodule of direct-current short circuit fault can be passed through;
Described clamp submodule, comprises the first direct current capacitor, the second direct current capacitor, the first gate-controlled switch device, the second gate-controlled switch device, the 3rd gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the 6th gate-controlled switch device, the first fly-wheel diode, the second fly-wheel diode, the 3rd fly-wheel diode, the 4th fly-wheel diode, the 5th fly-wheel diode, the 6th fly-wheel diode, the first catching diode and the second catching diode, the collector electrode of described first gate-controlled switch device, the collector electrode of the second gate-controlled switch device, the collector electrode of the 3rd gate-controlled switch device, the collector electrode of the 4th gate-controlled switch device, the collector electrode of the 5th gate-controlled switch device and the collector electrode of the 6th gate-controlled switch device respectively with the negative electrode of the first described fly-wheel diode, the negative electrode of the second fly-wheel diode, the negative electrode of the 3rd fly-wheel diode, the negative electrode of the 4th fly-wheel diode, the negative electrode of the 5th fly-wheel diode is connected with the negative electrode of the 6th fly-wheel diode, the emitter of the first described gate-controlled switch device, the emitter of the second gate-controlled switch device, the emitter of the 3rd gate-controlled switch device, the emitter of the 4th gate-controlled switch device, the emitter of the 5th gate-controlled switch device, the emitter of the 6th gate-controlled switch device respectively with the anode of the first described fly-wheel diode, the anode of the second fly-wheel diode, the anode of the 3rd fly-wheel diode, the anode of the 4th fly-wheel diode, the anode of the 5th fly-wheel diode, the anode of the 6th fly-wheel diode is connected, the collector electrode of the first described gate-controlled switch device is connected with the positive terminal of the first direct current capacitor with the negative electrode of the first clamping diode simultaneously, the emitter of the first gate-controlled switch device is connected with the collector electrode of the second gate-controlled switch device, as the positive terminal of clamp submodule, the emitter of the second described gate-controlled switch device is connected with the negative pole of the first direct current capacitor with the emitter of the 3rd gate-controlled switch device simultaneously, and the collector electrode of the 3rd described gate-controlled switch device is connected with the negative electrode of the second catching diode with the anode of the first clamping diode, the emitter of the 4th gate-controlled switch device simultaneously, the collector electrode of the 6th described gate-controlled switch device is connected with the positive pole of the second direct current capacitor with the collector electrode of the 4th gate-controlled switch device simultaneously, the emitter of the 5th described gate-controlled switch device is connected with the negative pole of the second DC capacitor with the anode of bis-Clamp-on position diode simultaneously, the collector electrode of the 5th described gate-controlled switch device is connected with the emitter of the 6th gate-controlled switch device, as the negative pole end of clamp submodule.
CN201410827384.4A 2014-12-25 2014-12-25 Modularized multi-level converter being able to traverse direct current short circuit fault Active CN104601017B (en)

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CN104821736A (en) * 2015-05-15 2015-08-05 国家电网公司 Modularized multi-level converter with function of DC side short circuit protection
CN106160545A (en) * 2016-07-06 2016-11-23 清华大学 A kind of brachium pontis hybrid bipolar modular multi-level converter
CN106452104A (en) * 2016-09-13 2017-02-22 清华大学 Unipolar current cross-connected three-level sub-module
CN107612397A (en) * 2017-10-31 2018-01-19 国网福建省电力有限公司 The clamped submodule of electric capacity, modularization multi-level converter and method of work using it
CN110244168A (en) * 2019-07-16 2019-09-17 青岛海信商用显示股份有限公司 A kind of electric control lock fault detection system and detection method
CN110890742A (en) * 2019-11-25 2020-03-17 上海交通大学 Direct-current side fault ride-through method of low-loss modular multilevel direct-current transformer
CN112713763A (en) * 2020-12-21 2021-04-27 安徽贵博新能科技有限公司 Self-starting method and device of circuit module and power assembly system

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CN103956925A (en) * 2014-04-28 2014-07-30 浙江大学 Hybrid MMC capacitor voltage balance control method
CN104022666A (en) * 2014-05-30 2014-09-03 荣信电力电子股份有限公司 Modularization multi-level converter valve for flexible DC power transmission system
CN104158419A (en) * 2014-08-04 2014-11-19 浙江大学 Method for balancing capacitor voltage of modularization multilevel converter

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WO2013044961A1 (en) * 2011-09-29 2013-04-04 Siemens Aktiengesellschaft Short-circuit current discharge for a sub-module of a modular multi-stage converter (mmc)
CN103731059A (en) * 2013-06-13 2014-04-16 华北电力大学 Novel double-clamping sub-module structure circuit of modular multilevel converter
CN103516243A (en) * 2013-10-10 2014-01-15 清华大学 Modularization multi-level current transformer current transforming module circuit with short-circuit protection function
CN103956925A (en) * 2014-04-28 2014-07-30 浙江大学 Hybrid MMC capacitor voltage balance control method
CN104022666A (en) * 2014-05-30 2014-09-03 荣信电力电子股份有限公司 Modularization multi-level converter valve for flexible DC power transmission system
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CN104821736A (en) * 2015-05-15 2015-08-05 国家电网公司 Modularized multi-level converter with function of DC side short circuit protection
CN106160545A (en) * 2016-07-06 2016-11-23 清华大学 A kind of brachium pontis hybrid bipolar modular multi-level converter
CN106160545B (en) * 2016-07-06 2018-12-11 清华大学 A kind of bridge arm hybrid bipolar modular multi-level converter
CN106452104A (en) * 2016-09-13 2017-02-22 清华大学 Unipolar current cross-connected three-level sub-module
CN106452104B (en) * 2016-09-13 2019-03-29 清华大学 Monopolar current is cross-linked three level submodules
CN107612397A (en) * 2017-10-31 2018-01-19 国网福建省电力有限公司 The clamped submodule of electric capacity, modularization multi-level converter and method of work using it
CN107612397B (en) * 2017-10-31 2023-08-04 国网福建省电力有限公司 Capacitance clamping sub-module, modularized multi-level converter applying same and working method
CN110244168A (en) * 2019-07-16 2019-09-17 青岛海信商用显示股份有限公司 A kind of electric control lock fault detection system and detection method
CN110244168B (en) * 2019-07-16 2021-05-25 青岛海信商用显示股份有限公司 Electric control lock fault detection system and detection method
CN110890742A (en) * 2019-11-25 2020-03-17 上海交通大学 Direct-current side fault ride-through method of low-loss modular multilevel direct-current transformer
CN110890742B (en) * 2019-11-25 2020-11-20 上海交通大学 Direct-current side fault ride-through method of low-loss modular multilevel direct-current transformer
CN112713763A (en) * 2020-12-21 2021-04-27 安徽贵博新能科技有限公司 Self-starting method and device of circuit module and power assembly system

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