CN107994560A - The new method realized UPFC failures and getted over based on resistance for dissipation - Google Patents

The new method realized UPFC failures and getted over based on resistance for dissipation Download PDF

Info

Publication number
CN107994560A
CN107994560A CN201711384987.1A CN201711384987A CN107994560A CN 107994560 A CN107994560 A CN 107994560A CN 201711384987 A CN201711384987 A CN 201711384987A CN 107994560 A CN107994560 A CN 107994560A
Authority
CN
China
Prior art keywords
resistance
upfc
dissipation
voltage
failure
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201711384987.1A
Other languages
Chinese (zh)
Inventor
郑涛
张滋行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
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 North China Electric Power University filed Critical North China Electric Power University
Priority to CN201711384987.1A priority Critical patent/CN107994560A/en
Publication of CN107994560A publication Critical patent/CN107994560A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A kind of new method realized UPFC failures and getted over based on resistance for dissipation, this method is mainly by parallel among the DC line between the both sides MMC transverters inside UPFCT dc And resistance for dissipationR sh When realizing body exterior failure, the imbalance power from circuit is absorbed by dissipating, reduce the bridge arm current and DC line voltage across poles of parallel connection side MMC, so as to fulfill the purpose of not locking parallel connection side MMC and the positive and negative voltage across poles of stable DC circuit after failure, UPFC is transferred to STATCOM patterns at this time, and output reactive power maintains the busbar voltage of shunt transformer access point.The composition form of accessory circuits is simple, is only made of IGBT and resistance for dissipation, when threshold value of the DC voltage higher than setting, triggers IGBT, puts into resistance for dissipation, absorb imbalance power.Therefore, UPFC fast and effectively get over by failure when this method can realize body exterior failure on the premise of complex hardware circuit is not increased additionally to system.UPFC failures get over the useful supplement of strategy when achievement in research can be as body exterior failure.

Description

The new method realized UPFC failures and getted over based on resistance for dissipation
Technical field
The invention belongs to UPFC relaying configurations field, and in particular to a kind of realizing based on resistance for dissipation is getted over by UPFC failures New method.
Background technology
UPFC is connection in series-parallel mixed type Flexible AC transmission system（Flexible AC transmission system, FACTS）Device, to realize that the real-time control to alternating current circuit and dynamic compensation propose, as the effective of control electric network state Means, it is only necessary to change its control law, be able to or realize and mend at the same time, string is mended, phase shift, the function such as pressure regulation.State at present The transverter topological structure of inside and outside engineer application mainly has three kinds, i.e. two level converters, diode clamp three-level converter And MMC（Modular Multilevel Converter, MMC）, the transverter based on MMC structures due to the degree of modularity is high, Harmonic content is few, troubleshooting capability is strong, is more suitable for high voltage large capcity transmission of electricity and obtains extensive concern.
It is relatively fewer to get over the document of strategy study for UPFC failures both at home and abroad at present, has focused largely on to body interior In the fault characteristic research of failure and relaying configuration, no matter and generally all being used straight after UPFC body interiors or external fault The by-pass switch of lock UPFC is engaged, exits UPFC.Cui Fubo etc.（Cui Fubo, Guo Jianbo, Jing Ping, wait MMC-UPFC ground connection to set Meter and its station internal fault specificity analysis [J] Proceedings of the CSEEs, 2014,34（0）：1-9.）Discuss MMC-UPFC differences The fault characteristic of earthing mode lower valve side ac bus single-phase earthing, is primarily upon influence of the earthing mode to fault characteristic, carries Go out the recommendation on improvement of earthing mode, the fault characteristic and failure for being not directed to body exterior failure get over strategy；Qiu Peng etc.（Fur coat Roc, Zhang Shujun, Huang Xiaoming, wait valve top-cross stream bus-bar fault Preservation tactics in .MMC-HVDC systems to study [J] power train blanket insurances Shield and control, 2014,42（19）：150-154.）After the specific master for providing MMC-HVDC valves side ac bus singlephase earth fault Standby relaying configuration, not to research body exterior failure when fault characteristic and failure get over strategy；Chen Xiaofang etc. （Chen Xiaofang, Zhao Chengyong, Cao chengang. Research on the fault characteristics of HVDC based on modular multilevel converter[C]/ IEEE Electrical Power and Energy Conference. 2011:91-96.）Analyze several classes of MMC-HVDC exchange side The fault characteristic of typical fault, devises negative-sequence current and active power ripple under improved control system suppression unbalanced fault Shape fluctuates, and the design that scheme is getted over to failure has certain reference, but realizes that failure gets over difficulty by control system Spend larger, be not easy to realize；Dong Xu etc.（Dong Xu, Dong Xu, high Stump, Wang Feng, wait wind-powered electricity generations through making somebody a mere figurehead flexible DC power transmission circuit simultaneously Alternating current-direct current fault traversing technology [J] Automation of Electric Systems of net, 2016,40（18）：48-55.）By designing DCCB and consumption Dissipate resistance, it is proposed that a kind of AC and DC fault traversing scheme of MMC-HVDC systems, has certain reference.
Get over therefore, it is necessary to find with accelerating the failure of UPFC when fast, simple method realizes body exterior failure, lead to Cross resistance for dissipation and realize that the failure of UPFC is getted over, it is simple and practicable, it is easy to implement in engineer application.Therefore the achievement in research of the present invention Strategy can be getted over for the failure of the UPFC in existing Practical Project reference is provided.
The content of the invention
In order to the failure of UPFC when realizing body exterior failure is getted over, the present invention proposes a kind of based on resistance for dissipation UPFC failures get over method, when threshold value of the DC voltage higher than setting, trigger IGBT, put into resistance for dissipation, absorb uneven Weigh power.Therefore, this method can realize body exterior failure on the premise of complex hardware circuit is not increased additionally to system When UPFC fast and effectively failure is getted over.Achievement in research can be used as UPFC failures during body exterior failure in Practical Project to get over The useful supplement of strategy.The analytic process of this method is as follows.
（1）The mathematical model of intermediate DC link：
The active power of UPFC and circuit switched, be by DC link in the series side transverter of UPFC and side in parallel transverter Between flow, the dynamic power equilibrium equation of UPFC intermediate DC links is：
In formula：p s The active power absorbed for side transverter in parallel；p lFor the active power of series side transverter output；p loss Table Show transverter and transformer loss.
（2）The control strategy of side transverter in parallel：
The side transverter double close-loop decoupling control block diagram such as attached drawing 6 in parallel being made of power/voltage outer shroud and current inner loop；In figure：q s *The reference value of reactive power is provided for power grid to side transverter in parallel；q s The idle work(provided for power grid to side transverter in parallel The actual value of rate；i * shd 、i * shq For transverter exchange side three-phase input current in side in paralleld、qThe reference value of axis component；i shd 、i shq For transverter exchange side three-phase input current in side in paralleld、qThe actual value of axis component；u * shd 、u * shq For side transverter in parallel Exchange side three-phase input voltaged、qThe reference value of axis component；u shd 、u shq For transverter exchange side three-phase input voltage in side in parallel 'sd、qThe actual value of axis component；u * dc For the reference value of DC voltage；u dc For the actual value of DC voltage；U 1For parallel device The network voltage of access point；ω s For power frequency angular frequency；R sh WithL sh The equivalent resistance and electricity of side transverter inlet wire respectively in parallel Sense.
（3）The control strategy of series side transverter：
The side transverter double close-loop decoupling control block diagram such as attached drawing 7 in parallel being made of power outer shroud and current inner loop；In figure：p * 1、q * 1 Reference value for from series side transverter to the active and reactive power of circuit output；p 1、q 1It is series side transverter to circuit output Active and reactive power reality；i * sed 、i * seq For series side transverter exchange side three-phase output currentd、qThe ginseng of axis component Examine value；i sed 、i seq For series side transverter exchange side three-phase output currentd、qThe actual value of axis component；u * sed 、u * seq For string Join side transverter exchange side three-phase output voltaged、qThe reference value of axis component；u sed 、u seq For series side transverter exchange side three Phase output voltaged、qThe actual value of axis component；u 12q 、u 12d For d, q axis component of series transformer three-phase output voltage；ω s For power frequency angular frequency；R se WithL se The equivalent resistance and inductance of side transverter inlet wire respectively in parallel.
（4）The fault characteristic of UPFC after body exterior failure is analyzed:
1）String become that right side circuit point generation is single-phase or alternate earth fault after after failure, big voltage is added in series transformer net On the winding of side, and go here and there become source side winding bear overcurrent, at this time the active power on circuit less failure when substantially increase, I.e. in series side converter Control block diagramq 1It is far longer than reference valueq * 1, since series side transverter is using determining power control System, therefore series side MMC absorbs unnecessary active power from circuit, which is known as uneven work(by the present invention Rate, causes formula（1）Inp dc Rise, DC capacitor are electrically charged, AC line voltage rise；
2）After failure, big voltage is applied directly to string and becomes source side winding both ends, and string becomes the serious overcurrent of source side winding, coupled to valve side Afterwards, valve side overcurrent, so as to cause series side MMC upper and lower bridge arm overcurrents；
3）The imbalance power that series side MMC is absorbed from circuit, by DC line, is delivered to side MMC in parallel, causes side in parallel MMC bridge arm overcurrents.
According to above-mentioned analysis, a kind of new method realized UPFC failures and getted over based on resistance for dissipation, it is characterised in that bag Include following steps：
Step 1：Ask for resistance for dissipationR sh Resistance value；
Step 2：Monitor the positive and negative voltage across poles of DC lineu dc ；
Step 3：The threshold value of DC voltage is setU dcset ；
Step 4：By the actual value of DC voltageu dc Compared with threshold value, whenu dc >U dcset , triggeringT dc , input dissipates electric ResistanceR sh 。
Brief description of the drawings
Fig. 1 is simulation model schematic diagram.
Fig. 2 be failure after do not have put into resistance for dissipation when MMC bridge arm currents in side in parallel.
Fig. 3 be failure after do not have put into resistance for dissipation when direct current voltage across poles.
Fig. 4 is the MMC bridge arm currents in side in parallel after failure during input resistance for dissipation.
Fig. 5 is the direct current voltage across poles after failure during input resistance for dissipation.
Fig. 6 is power/voltage outer shroud, current inner loop parallel connection side transverter double close-loop decoupling control block diagram.
Fig. 7 power outer shroud, current inner loop parallel connection side transverter double close-loop decoupling control block diagram.
Embodiment
Further illustrate technical scheme below with reference to the accompanying drawings and specific embodiments.
In order to it is clearer show UPFC body exterior failures after, resistance for dissipation stable DC side voltage and suppress in parallel and become The effect of depressor side MMC bridge arm overcurrents, as shown in Figs 1-4, the present invention sets forth resistance for dissipation after failure do not put into and MMC bridge arm currents in side in parallel and direct current voltage across poles in the case of two kinds of input.It is a kind of that UPFC events are realized based on resistance for dissipation Hinder the new method getted over, this method can realize body exterior event on the premise of complex hardware circuit is not increased additionally to system UPFC fast and effectively get over by failure during barrier, it is characterised in that the detailed process of the program is as follows.
（1）Ask for the resistance for dissipation in resistance for dissipationR sh Resistance value；
Step（1）InR sh Method for solving it is as follows：；
In formula：ΔP max For maximum imbalance power.
（2）Monitor the positive and negative voltage across poles of DC lineu dc 。
（3）The threshold value of DC voltage is setU dcset ；
WhereinU dcset Value 1.1 times of DC voltage per unit value when being normal operation.
（4）By the actual value of DC voltageu dc Compared with threshold value, whenu dc >U dcset , triggeringT dc , input dissipates electric ResistanceR sh 。
Work as DC voltageu dc After the threshold value of setting, both deviations are with frequency by PI linksfTriangular wave Compare, caused pulse width modulated wave isT dc Trigger pulse.And triangular wave wherein, the upper limit value of PI links is set as 1, i.e., Amplitude it is identical, lower limit is set as 0, ensure system normal operation oru dc It is reduced toU dcset When following,T dc Do not trigger and lead It is logical.
Presently disclosed techniques scheme is introduced by a specific embodiment further below.
The voltage class of alternating current circuit is 500kV in Fig. 1, and the voltage class of DC line is 180kV, circuit unit length Resistance be 0.00016/m, the reactance of unit length is 0.00368/m, the resistance for dissipation in resistance for dissipationR sh =30 Ω.Make Fig. 1 middle-range series transformers T2When being in t=3s AB phase-to phase faults occur for right side 15km, can be seen that from Fig. 2, Fig. 3 In the case of not putting into resistance for dissipation, the serious overcurrent of side MMC bridge arms in parallel, reaches the working value that valve control is protected（Valve in the present invention The working value of control protection is 2000A）, and DC voltage raises rapidly after failure；Input resistance for dissipation is can be seen that from Fig. 4, Fig. 5 (0.1ms is put into after failure) afterwards, MMC bridge arm currents in side in parallel drop to below the working value of valve control protection, and direct current at this time Pressure is stablized near its rated value.
Simulation result can be seen that the present invention propose by the UPFC failures based on resistance for dissipation get over strategy, this method UPFC fast and effectively events when can realize body exterior failure on the premise of complex hardware circuit is not increased additionally to system Barrier is getted over.
The above, is only the preferable specific embodiment of the present invention, but the scope of application of the present invention is not only limited to this, Any people for being familiar with the technology disclosed herein technical scope in, the change or replacement that can readily occur in, should all contain Cover within the scope of application of the present invention.Therefore, the scope of application of the invention should be subject to the scope of application of claim.

Claims (5)

  1. A kind of 1. new method realized UPFC failures and getted over based on resistance for dissipation, it is characterised in that：The method only needs It is in parallel between DC line between the MMC of UPFC both sidesT dc And resistance for dissipationR sh , the injustice from circuit is absorbed by resistance for dissipation Weigh power, reduces the bridge arm current and DC voltage of parallel connection side MMC, so as to fulfill not locking parallel connection side MMC after failure and surely Determine the purpose of the positive and negative voltage across poles of DC line；This method can be on the premise of complex hardware circuit not be increased additionally to system UPFC fast and effectively get over by failure when realizing body exterior failure.
  2. 2. a kind of new method realized UPFC failures and getted over based on resistance for dissipation, it is characterised in that comprise the following steps：
    （1）Ask for resistance for dissipationR sh Resistance value；
    （2）Monitor the positive and negative voltage across poles of DC lineu dc ；
    （3）The threshold value of DC voltage is setU dcset ；
    （4）By the actual value of DC voltageu dc Compared with threshold value, whenu dc >U dcset , triggeringT dc , put into resistance for dissipationR sh 。
  3. 3. according to the new method realized UPFC failures and getted over based on resistance for dissipation described in claim 2, it is characterised in that：
    Step（1）InR sh Method for solving it is as follows：
    In formula：ΔP max For maximum imbalance power.
  4. 4. according to the new method realized UPFC failures and getted over based on resistance for dissipation described in claim 2, it is characterised in that：
    Step（3）InU dcset Value 1.1 times of DC voltage per unit value when being normal operation.
  5. 5. according to the new method realized UPFC failures and getted over based on resistance for dissipation described in claim 2, it is characterised in that：
    Step（4）T dc Triggering and conducting scheme be：
    Work as DC voltageu dc After the threshold value of setting, both deviations are with frequency by PI linksfTriangle wave, Caused pulse width modulated wave isT dc Trigger pulse；Wherein, the upper limit value of PI links is set as 1, the i.e. width with triangular wave Be worth identical, lower limit is set as 0, ensure system normal operation oru dc It is reduced toU dcset When following,T dc Not triggering and conducting.
CN201711384987.1A 2017-12-20 2017-12-20 The new method realized UPFC failures and getted over based on resistance for dissipation Pending CN107994560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711384987.1A CN107994560A (en) 2017-12-20 2017-12-20 The new method realized UPFC failures and getted over based on resistance for dissipation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711384987.1A CN107994560A (en) 2017-12-20 2017-12-20 The new method realized UPFC failures and getted over based on resistance for dissipation

Publications (1)

Publication Number Publication Date
CN107994560A true CN107994560A (en) 2018-05-04

Family

ID=62039313

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711384987.1A Pending CN107994560A (en) 2017-12-20 2017-12-20 The new method realized UPFC failures and getted over based on resistance for dissipation

Country Status (1)

Country Link
CN (1) CN107994560A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109950916A (en) * 2019-04-11 2019-06-28 华北电力大学 UPFC failure based on mixed type impedance gets over method
CN109950890A (en) * 2019-03-25 2019-06-28 华中科技大学 A kind of full-control type energy-consuming device
CN110086191A (en) * 2019-01-31 2019-08-02 中国电力科学研究院有限公司 A kind of failure of the MMC-UPFC based on current-limiting reactor gets over method
CN110233492A (en) * 2018-12-23 2019-09-13 国网内蒙古东部电力有限公司经济技术研究院 Method for improving power grid stability under direct current blocking fault by using FACTS technology

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383578A (en) * 2008-09-22 2009-03-11 艾默生网络能源有限公司 Dual-feeding motor system having protecting device and protecting method thereof
CN102570503A (en) * 2011-12-30 2012-07-11 东方电气集团东方汽轮机有限公司 Double-fed wind power generation system
CN106026137A (en) * 2016-05-30 2016-10-12 许继电气股份有限公司 Alternating current line fault ride-through control method for unified power flow controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383578A (en) * 2008-09-22 2009-03-11 艾默生网络能源有限公司 Dual-feeding motor system having protecting device and protecting method thereof
CN102570503A (en) * 2011-12-30 2012-07-11 东方电气集团东方汽轮机有限公司 Double-fed wind power generation system
CN106026137A (en) * 2016-05-30 2016-10-12 许继电气股份有限公司 Alternating current line fault ride-through control method for unified power flow controller

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
李文津等: "含动态直流泄能电阻的MMC-HVDC提高风电场低电压穿越能力研究", 《电网技术》 *
郑涛等: "基于MMC的统一潮流控制器交流侧故障特性及保护方案", 《电网技术》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110233492A (en) * 2018-12-23 2019-09-13 国网内蒙古东部电力有限公司经济技术研究院 Method for improving power grid stability under direct current blocking fault by using FACTS technology
CN110086191A (en) * 2019-01-31 2019-08-02 中国电力科学研究院有限公司 A kind of failure of the MMC-UPFC based on current-limiting reactor gets over method
CN109950890A (en) * 2019-03-25 2019-06-28 华中科技大学 A kind of full-control type energy-consuming device
CN109950916A (en) * 2019-04-11 2019-06-28 华北电力大学 UPFC failure based on mixed type impedance gets over method
CN109950916B (en) * 2019-04-11 2020-10-30 华北电力大学 UPFC fault transition method based on mixed impedance

Similar Documents

Publication Publication Date Title
CN107069679B (en) A kind of symmetrical bipolar MMC DC side monopolar grounding fault passes through and restoration methods
Jindal et al. Interline unified power quality conditioner
CN105406499B (en) A kind of intelligent Hybrid HVDC system and fault handling method
CN107994560A (en) The new method realized UPFC failures and getted over based on resistance for dissipation
Hao et al. Voltage limit control of modular multilevel converter based unified power flow controller under unbalanced grid conditions
CN103401263B (en) Mixed type three-pole direct current power transmission system and control method thereof
CN107492902B (en) Railway traction power supply system based on flywheel energy storage device and method for improving power quality of railway traction power supply system
CN104734134B (en) A kind of inverter earthed system
Xu et al. Modular multilevel converter with embedded energy storage for bidirectional fault isolation
CN107359644A (en) A kind of microgrid interface topology apparatus
Xu et al. Protection coordination of meshed MMC-MTDC transmission systems under DC faults
Kale et al. Integration of proactive hybrid circuit breaker with current flow controller for bipolar HVDC grid
CN106936153B (en) Novel extra-high voltage direct current transmission system and operation mode switching method
Wu et al. Active damping control of multiport DC power flow controller for MMC-MTDC with unbalanced AC grid
Sano et al. A fault protection method for avoiding overvoltage in symmetrical monopole HVDC systems by half-bridge MMC
CN106451428B (en) A kind of mixed type Research on Unified Power Quality Conditioner with short-circuit current-limiting function
CN107370130A (en) A kind of hybrid high voltage DC breaker and its control strategy based on modified half-bridge submodule
Kale et al. Coordination of Current Flow Controller with HVDC Circuit Breakers for Meshed HVDC Grid Systems
Li et al. Study on main circuit configuration and control modes for a new LCC-MMC hybrid HVDC system
CN205986160U (en) Dynamic voltage restorer with short -circuit current restricts function
CN107785908A (en) A kind of dynamic electric voltage recovery device with short circuit current limitation function
Wang et al. Protection and pole voltage rebalancing for pole-to-ground faults in symmetrical monopolar HVDC grids
Hu et al. Comparison of three LCC-MMC hybrid HVDC links based on AC fault response characteristics
CN112526261B (en) Fault control strategy test system and method
Chen et al. Coordination control and start-up strategy in flexible DC urban distribution networks for smart cities

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20180504