CN108649544A - A kind of mechanical high-voltage dc circuit breaker device and its cutoff method - Google Patents

A kind of mechanical high-voltage dc circuit breaker device and its cutoff method Download PDF

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Publication number
CN108649544A
CN108649544A CN201810557198.1A CN201810557198A CN108649544A CN 108649544 A CN108649544 A CN 108649544A CN 201810557198 A CN201810557198 A CN 201810557198A CN 108649544 A CN108649544 A CN 108649544A
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China
Prior art keywords
current
switch
spark gap
branch
voltage
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CN201810557198.1A
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Inventor
司马文霞
付峥争
杨鸣
袁涛
孙魄韬
段盼
韩雪
司燕
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Chongqing University
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Chongqing University
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Priority to CN201810557198.1A priority Critical patent/CN108649544A/en
Publication of CN108649544A publication Critical patent/CN108649544A/en
Priority to PCT/CN2019/076818 priority patent/WO2019227995A1/en
Pending legal-status Critical Current

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    • 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
    • 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
    • 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]

Abstract

The present invention relates to the topology design technical fields of key equipment in straight-flow system, and in particular to a kind of mechanical high-voltage dc circuit breaker device and its cutoff method.Described device, including main branch, the overvoltage of running current and dc circuit breaker both ends when cut-offfing fault current for undertaking DC line, and realize the bidirectional conduction of DC line electric current；Branch is shifted, for generating an oscillating current opposite with main branch current direction, and reversing oscillating current, which is added to, makes the fault current in main branch force zero passage in main branch, and fault current is transferred to transfer branch from main branch to realize；Absorb branch, for absorb and release failure on-off when the energy accumulated；Aftercurrent cut-offs element, connects with main branch, for cut-offfing aftercurrent.

Description

A kind of mechanical high-voltage dc circuit breaker device and its cutoff method
Technical field
The present invention relates to the topology design technical fields of key equipment in straight-flow system, and in particular to a kind of mechanical high-voltage Dc circuit breaker device and its cutoff method.
Background technology
Flexible DC transmission technology is to solve large capacity, long distance power transmission and the effective hand for realizing modern electric transmission Section.Since it has the advantages that flexible separately adjustable active power and reactive power, so flexible DC transmission technology is extensive It is used in extensive regenerative resource transmission of electricity.However, flexible DC transmission technology itself cannot handle DC side line fault. After DC side failure occurs, the fault current in current conversion station increases severely, may be to the equipment in current conversion station, such as：Power electronics is set It is standby, cause electrical breakdown or thermal breakdown.Therefore DC side failure is cut-off to flexible DC power transmission skill with dc circuit breaker The further development of art plays an important role.
Dc circuit breaker can be divided into mechanical dc circuit breaker, hybrid dc circuit breaker and solid state direct current interruption Device.Wherein, since mechanical dc circuit breaker does not contain power electronic devices, compared to hybrid dc circuit breaker and admittedly Stance dc circuit breaker has the advantages that at low cost and on-state loss is small.Further, mechanical dc circuit breaker can be divided into passive Mechanical dc circuit breaker and active mechanical dc circuit breaker.Wherein, since active mechanical dc circuit breaker is compared to passive mechanical Dc circuit breaker has the advantages that switch off time is short, so active mechanical dc circuit breaker has good application prospect.
Active mechanical dc circuit breaker generally by residual electric current breaker, main branch, transfer branch and absorbs branch four It is grouped as.Its main principle of cut-offfing is：When cut-offfing, transfer branch generation one is opposite with main branch fault current direction to shake Electric current is swung, fault current is first gradually transferred to transfer branch from main branch, after the oscillating capacitance electric discharge of transfer branch road, Fault current is to oscillating capacitance reverse charging, when the reverse charging voltage reaches the operation voltage for absorbing branch road arrester, Fault current is transferred to from transfer branch to be absorbed branch progress energy absorption and releases, and finally cut-offs suction by residual electric current breaker Aftercurrent in revenue and expenditure road is completed direct current and is cut-off.And there is following disadvantages for existing active mechanical dc circuit breaker：(1) DC side failure cannot continuously be cut-off in a short time；(2) fault current is not effectively utilized to transfer branch road Oscillating capacitance reverse charging voltage.
Invention content
In view of this, the present invention provide it is a kind of have it is continuous from fill can and continuous connecting-disconnecting function mechanical high-voltage direct current it is disconnected Road device device.
The purpose of the present invention is achieved through the following technical solutions：
A kind of mechanical high-voltage dc circuit breaker device, including
Main branch, the running current for undertaking DC line and dc circuit breaker both ends when cut-offfing fault current Overvoltage, and realize the bidirectional conduction of DC line electric current；
Branch is shifted, for generating an oscillating current opposite with main branch current direction, and by reversing oscillating current So that the fault current in main branch is forced zero passage in the main branch that is added to, is transferred to fault current from main branch to realize Move branch；
Absorb branch, for absorb and release failure on-off when the energy accumulated；
Aftercurrent cut-offs element, connects with main branch, for cut-offfing aftercurrent.
Further, the main branch includes concatenated current transformer and mechanical switch.
Further, the transfer branch is in parallel with main branch, and transfer branch includes concatenated spark gap switch bridge and shakes Swing inductance.
Further, the transfer branch road is also in series with stray resistance.
Further, the spark gap switch bridge includes by spark gap switch S1, spark gap switch S2, spark gap Switch S3, spark gap switch S4It is sequentially connected in series the bridge architecture of composition, the anode of oscillating capacitance is connected to spark gap switch S3 With spark gap switch S4Between, the cathode of oscillating capacitance is connected to spark gap switch S1With spark gap switch S2Between.
Further, the absorption branch is in parallel with main branch, and it includes at least 2 groups of concatenated arresters to absorb branch.
Further, further include control system, the current transformer of main branch send the current signal of acquisition to control system, Control system is switched according to current signal control machinery and spark gap switch is turned on or off.
Further, the control system includes
Fault detection unit compares the electric current for flowing through mechanical switch of current transformer acquisition with failure current thresholds Compared with if the electric current of acquisition is judged as DC side failure more than or equal to failure current thresholds, if acquisition electric current is less than fault current threshold Value, is judged as system normal operation；
Mechanical switch control unit receives the breakdown judge signal that fault detection unit transmits, if breakdown judge signal is DC side failure, then control machinery switch disconnection, if breakdown judge signal is no DC side failure, control machinery switch is kept Conducting state；
Delay unit, be delayed preset time after mechanical switch disconnection；
First pilot spark gap onunit, for during first time failure on-off, being preset in delay unit delay After time, pilot spark gap S1, S3Switch conduction；And
Second pilot spark gap onunit, it is default in delay unit delay during second of failure on-off After time, pilot spark gap S2, S4Switch conduction.
Further, the preset time is 2 milliseconds.
Invention additionally discloses a kind of cutoff methods of mechanical high-voltage dc circuit breaker, include the following steps：
1) on-line monitoring flows through the electric current of mechanical switch, if the electric current is more than malfunction monitoring threshold current, is judged as event Barrier；
2) disjunction mechanical switch；
3) postpone 2 milliseconds after the disjunction of Crush trigger switch, the first pilot spark gap onunit triggers between a pair of of spark Gap switch S1, S3Conducting；
4) the spark gap switch S that the oscillating capacitance being pre-charged passes through conducting1, S3Access transfer branch, generates one and stream Cross the opposite oscillating current in the fault current direction of mechanical switch；
5) when oscillating current amplitude is equal to fault current, mechanical switch realization is cut-off completely, and fault current is to oscillation electricity Hold reverse charging, realization fills backward voltage with automatically to oscillating capacitance；
6) when oscillating capacitance both end voltage reaches lightning arrestor movement voltage, lightning arrestor movement, energy is released from arrester；
7) residual electric current breaker cut-offs the aftercurrent in arrester, completes first time failure on-off；
8) free time, breaker reclosing, if reclosing is in permanent fault, fault detection unit are removed by a segment fault It is judged as failure；
9) disjunction mechanical switch；
10) postpone 2 milliseconds after the disjunction of Crush trigger switch, the second pilot spark gap onunit triggers between a pair of of spark Gap switch S2, S4Conducting；
11) the spark gap switch S that the oscillating capacitance being pre-charged passes through conducting2, S4Access transfer branch, generate one with Flow through the opposite oscillating current in the fault current direction of mechanical switch；
12) when oscillating current amplitude is equal to fault current, mechanical switch realization is cut-off completely, and fault current is to oscillation electricity Hold reverse charging, realization fills backward voltage with automatically to oscillating capacitance；
13) when oscillating capacitance both end voltage reaches lightning arrestor movement voltage, lightning arrestor movement, energy is let out from arrester It puts；
14) residual electric current breaker cut-offs the aftercurrent in arrester, completes second of failure on-off.
By adopting the above-described technical solution, the present invention has the advantage that：
The present invention is used seals in the method for shifting branch by spark gap switch bridge by oscillating capacitance is pre-charged, by not With different groups of other spark gap switches are triggered during failure on-off, effectively utilizes fault current and transfer branch road is vibrated Pre-charge voltage of the reverse charging voltage of capacitance as second of oscillating capacitance, can be to carry out DC side failure in the short time Continuously cut-off.It effectively utilizes fault current and electricity is vibrated as second to the reverse charging voltage of transfer branch road oscillating capacitance The pre-charge voltage of appearance, can be continuously to cut-off DC side failure in the short time, novelty simple in structure, saves cost.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke To be instructed from the practice of the present invention.The target and other advantages of the present invention can by following specification realizing and It obtains.
Description of the drawings
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into The detailed description of one step：
Fig. 1 is a kind of structure chart of mechanical high-voltage dc circuit breaker device of the present invention；
Fig. 2 is the capacitance voltage oscillogram for carrying out failure on-off twice；
Fig. 3 is the fault current waveform figure for carrying out failure on-off twice.
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from Various modifications or alterations are carried out under the spirit of the present invention.
Referring to Fig. 1, the mechanical high-voltage dc circuit breaker device of the present embodiment, including
Main branch 1, including concatenated current transformer TA and mechanical switch K, the normal work for undertaking DC line The overvoltage of electric current and dc circuit breaker both ends when cut-offfing fault current, and realize the bidirectional conduction of DC line electric current；
Branch 2 is shifted, in parallel with main branch, it includes concatenated spark gap switch bridge, oscillation inductance L and miscellaneous to shift branch Dissipate resistance R.It is added to main branch for generating an oscillating current opposite with main branch current direction, and by reversing oscillating current Road makes the fault current in main branch force zero passage, and fault current is transferred to transfer branch from main branch to realize；Institute It includes by spark gap switch S to state spark gap switch bridge1, spark gap switch S2, spark gap switch S3, spark gap opens Close S4It is sequentially connected in series the bridge architecture of composition, the anode of oscillating capacitance C is connected to spark gap switch S3With spark gap switch S4 Between, the cathode of oscillating capacitance C is connected to spark gap switch S1With spark gap switch S2Between.
Branch 3 is absorbed, in parallel with main branch, it includes at least 2 groups of concatenated arrester F to absorb branch, for absorbing and letting out Put the energy accumulated when failure on-off；
Aftercurrent cut-offs element K1, connects with main branch, absorbs aftercurrent in branch arrester for cut-offfing.
Control system (not shown), the current transformer TA of main branch, which send the current signal of acquisition to control, is System, control system are turned on or off according to current signal control machinery switch K and spark gap switch.The control system packet It includes：
Fault detection unit carries out the electric current for flowing through mechanical switch K of current transformer acquisition with failure current thresholds Compare, if the electric current of acquisition is more than or equal to failure current thresholds, be judged as DC side failure, if acquisition electric current is less than fault current Threshold value is judged as system normal operation；
Mechanical switch K control units receive the breakdown judge signal that fault detection unit transmits, if breakdown judge signal is DC side failure, then control machinery switch K disconnections, if breakdown judge signal is no DC side failure, control machinery switch K is protected Hold conducting state；
Delay unit is delayed 2 milliseconds after mechanical switch K is disconnected；
First pilot spark gap onunit, for during first time failure on-off, being delayed 2 milliseconds in delay unit Afterwards, pilot spark gap S1, S3Switch conduction；And
Second pilot spark gap onunit is delayed 2 milliseconds during second of failure on-off in delay unit Afterwards, pilot spark gap S2, S4Switch conduction.
Invention additionally discloses a kind of cutoff methods of mechanical high-voltage dc circuit breaker, include the following steps：
1) on-line monitoring flows through the electric current of mechanical switch K, if the electric current is more than malfunction monitoring threshold current, is judged as event Barrier；
2) disjunction mechanical switch K；
3) postpone 2 milliseconds after Crush trigger switch K disjunctions, the first pilot spark gap onunit triggers between a pair of of spark Gap switch S1, S3Conducting；
4) the spark gap switch S that the oscillating capacitance C being pre-charged passes through conducting1, S3Access transfer branch, generate one with Flow through the opposite oscillating current in the fault current direction of mechanical switch K；
5) when oscillating current amplitude is equal to fault current, mechanical switch K realizations are cut-off completely, and fault current is to oscillation electricity Hold C reverse chargings, realization fills backward voltage with automatically to oscillating capacitance C；
6) when oscillating capacitance C both end voltages reach arrester F operation voltages, arrester F action, energy is from arrester F It releases；
7) residual electric current breaker cut-offs the aftercurrent in arrester F, completes first time failure on-off；
8) free time, breaker reclosing, if reclosing is in permanent fault, fault detection unit are removed by a segment fault It is judged as failure；
9) disjunction mechanical switch K；
10) postpone 2 milliseconds after Crush trigger switch K disjunctions, second a pair of of spark of pilot spark gap onunit triggering Gap switch S2, S4Conducting；
11) the spark gap switch S that the oscillating capacitance C being pre-charged passes through conducting2, S4Access transfer branch, generate one with Flow through the opposite oscillating current in the fault current direction of mechanical switch K；
12) when oscillating current amplitude is equal to fault current, mechanical switch K realizations are cut-off completely, and fault current is to oscillation Capacitance C reverse chargings, realization fill backward voltage with automatically to oscillating capacitance C；
13) when oscillating capacitance C both end voltages reach arrester F operation voltages, arrester F action, energy is from arrester F It releases；
14) residual electric current breaker cut-offs the aftercurrent in arrester F, completes second of failure on-off.
The mechanical high-voltage of the present embodiment is used in the both-end flexible direct current power transmission system that DC voltage level is ± 200kV Dc circuit breaker device and its cutoff method, rated direct current 1kA occur in t=0s in unilateral current conversion station exit Interpolar short circuit metal, and be permanent fault, it is 140 milliseconds that line fault, which goes the free time, disconnected in t=150ms moment direct currents Combined floodgate is thought highly of on road, and setting breaker shifts branch stray resistance R=0.01 Ω, oscillating capacitance C=10 μ F, oscillation inductance L=200 μ H, oscillating capacitance first time pre-charge voltage VC1Shown in=100kV, PSCAD simulation result See Figure 2,3.Fig. 2 is failure twice The capacitance voltage oscillogram cut-off, Fig. 3 are the fault current waveform figure of failure on-off twice.It can be seen that in figure, the present invention proposes It is a kind of have it is continuous from fill can and the mechanical high-voltage dc circuit breaker device and cutoff method of continuous connecting-disconnecting function can be effective Ground is electric as the precharge of second of oscillating capacitance to the reverse charging voltage of transfer branch road oscillating capacitance using fault current Pressure, can realize that continuous fault is cut-off twice in shorter reclosure time.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention Protection domain in.

Claims (10)

1. a kind of mechanical high-voltage dc circuit breaker device, it is characterised in that：Including
Main branch, running current for undertaking DC line and when cut-offfing fault current dc circuit breaker both ends it is excessively electric Pressure, and realize the bidirectional conduction of DC line electric current；
Branch is shifted, for generating an oscillating current opposite with main branch current direction, and reversing oscillating current is superimposed So that the fault current in main branch is forced zero passage on to main branch, fault current is transferred to transfer branch from main branch to realize Road；
Absorb branch, for absorb and release failure on-off when the energy accumulated；
Aftercurrent cut-offs element, connects with main branch, for cut-offfing aftercurrent.
2. a kind of mechanical high-voltage dc circuit breaker device according to claim 1, which is characterized in that the main branch packet Include concatenated current transformer and mechanical switch.
3. a kind of mechanical high-voltage dc circuit breaker device according to claim 2, which is characterized in that the transfer branch In parallel with main branch, transfer branch includes concatenated spark gap switch bridge and oscillation inductance.
4. a kind of mechanical high-voltage dc circuit breaker device according to claim 3, which is characterized in that the transfer branch On be also in series with stray resistance.
5. a kind of mechanical high-voltage dc circuit breaker device according to claim 3, which is characterized in that the spark gap Switch bridge includes by spark gap switch S1, spark gap switch S2, spark gap switch S3, spark gap switch S4It goes here and there successively The bridge architecture of composition is connect, the anode of oscillating capacitance is connected to spark gap switch S3With spark gap switch S4Between, oscillation electricity The cathode of appearance is connected to spark gap switch S1With spark gap switch S2Between.
6. a kind of mechanical high-voltage dc circuit breaker device according to claim 5, which is characterized in that the absorption branch In parallel with main branch, it includes at least 2 groups of concatenated arresters to absorb branch.
7. a kind of mechanical high-voltage dc circuit breaker device according to any one of claim 2-6, which is characterized in that also Including control system, the current transformer of main branch send the current signal of acquisition to control system, and control system is according to electric current Signal controlling machine tool switchs and spark gap switch is turned on or off.
8. a kind of mechanical high-voltage dc circuit breaker device according to claim 7, which is characterized in that the control system Including
The electric current for flowing through mechanical switch of current transformer acquisition is compared by fault detection unit with failure current thresholds, If the electric current of acquisition is more than or equal to failure current thresholds, it is judged as DC side failure, if acquisition electric current is less than failure current thresholds, It is judged as system normal operation；
Mechanical switch control unit receives the breakdown judge signal that fault detection unit transmits, if breakdown judge signal is direct current Side failure, then control machinery switch disconnection, if breakdown judge signal is no DC side failure, control machinery switch is held on State；
Delay unit, be delayed preset time after mechanical switch disconnection；
First pilot spark gap onunit is used for during first time failure on-off, in delay unit delay preset time Afterwards, pilot spark gap S1, S3Switch conduction；And
Second pilot spark gap onunit, during second of failure on-off, in delay unit delay preset time Afterwards, pilot spark gap S2, S4Switch conduction.
9. a kind of mechanical high-voltage dc circuit breaker device according to claim 8, which is characterized in that the preset time It is 2 milliseconds.
10. a kind of cutoff method of the mechanical high-voltage dc circuit breaker as described in any one of claim 1-9, it is characterised in that Include the following steps：
1) on-line monitoring flows through the electric current of mechanical switch, if the electric current is more than malfunction monitoring threshold current, is judged as failure；
2) disjunction mechanical switch；
3) postpone 2 milliseconds after the disjunction of Crush trigger switch, first a pair of of spark gap of pilot spark gap onunit triggering is opened Close S1, S3Conducting；
4) the spark gap switch S that the oscillating capacitance being pre-charged passes through conducting1, S3Access transfer branch, generates one and flows through machine The opposite oscillating current in fault current direction of tool switch；
5) when oscillating current amplitude is equal to fault current, mechanical switch realization is cut-off completely, and fault current is anti-to oscillating capacitance To charging, realization fills backward voltage with automatically to oscillating capacitance；
6) when oscillating capacitance both end voltage reaches lightning arrestor movement voltage, lightning arrestor movement, energy is released from arrester；
7) residual electric current breaker cut-offs the aftercurrent in arrester, completes first time failure on-off；
8) it is gone the free time by a segment fault, breaker reclosing, if reclosing, in permanent fault, fault detection unit judges For failure；
9) disjunction mechanical switch；
10) postpone 2 milliseconds after the disjunction of Crush trigger switch, second a pair of of spark gap of pilot spark gap onunit triggering is opened Close S2, S4Conducting；
11) the spark gap switch S that the oscillating capacitance being pre-charged passes through conducting2, S4Access transfer branch, generate one with flow through The opposite oscillating current in the fault current direction of mechanical switch；
12) when oscillating current amplitude is equal to fault current, mechanical switch realization is cut-off completely, and fault current is anti-to oscillating capacitance To charging, realization fills backward voltage with automatically to oscillating capacitance；
13) when oscillating capacitance both end voltage reaches lightning arrestor movement voltage, lightning arrestor movement, energy is released from arrester；
14) residual electric current breaker cut-offs the aftercurrent in arrester, completes second of failure on-off.
CN201810557198.1A 2018-06-01 2018-06-01 A kind of mechanical high-voltage dc circuit breaker device and its cutoff method Pending CN108649544A (en)

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PCT/CN2019/076818 WO2019227995A1 (en) 2018-06-01 2019-03-04 Mechanical high-voltage direct-current circuit breaker device and breaking method thereof

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WO2019227995A1 (en) * 2018-06-01 2019-12-05 重庆大学 Mechanical high-voltage direct-current circuit breaker device and breaking method thereof
CN111355213A (en) * 2018-12-21 2020-06-30 平高集团有限公司 Direct current breaker
CN111355213B (en) * 2018-12-21 2023-09-01 平高集团有限公司 Direct current breaker
CN110970875A (en) * 2019-10-17 2020-04-07 四川大学 Combined current-limiting type direct current breaker for direct current power grid
CN111211543A (en) * 2020-01-19 2020-05-29 国网江苏省电力有限公司电力科学研究院 Fusing type direct current breaker and control method thereof
CN111211543B (en) * 2020-01-19 2022-06-17 国网江苏省电力有限公司电力科学研究院 Fusing type direct current breaker and control method thereof
US20220224100A1 (en) * 2021-01-12 2022-07-14 Tianjin University Adaptive fault clearing scheme for mmc vsc-hvdc grid based on source-grid coordination
US11444450B2 (en) * 2021-01-12 2022-09-13 Tianjin University Adaptive fault clearing scheme for MMC VSC-HVDC grid based on source-grid coordination
CN112865516A (en) * 2021-02-26 2021-05-28 华北电力大学 Active resonance type direct current change-over switch and control method thereof
CN112886555A (en) * 2021-03-03 2021-06-01 广东电网有限责任公司 Integrated direct-current circuit breaker, direct-current transmission line and fault removing method
CN113422358A (en) * 2021-07-22 2021-09-21 全球能源互联网研究院有限公司 Active oscillation type direct current breaker and application method thereof

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