CN107039993A - Symmetrical bipolar flexible direct-current transmission converter power turns band control method - Google Patents

Symmetrical bipolar flexible direct-current transmission converter power turns band control method Download PDF

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Publication number
CN107039993A
CN107039993A CN201710259291.XA CN201710259291A CN107039993A CN 107039993 A CN107039993 A CN 107039993A CN 201710259291 A CN201710259291 A CN 201710259291A CN 107039993 A CN107039993 A CN 107039993A
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power
band
voltage
pole
current
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CN107039993B (en
Inventor
李超
唐志军
林国栋
石吉银
胡文旺
陈锦山
晁武杰
郭健生
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365Reducing harmonics or oscillations in HVDC
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

Turn band control method the present invention relates to a kind of symmetrical bipolar flexible direct-current transmission converter power.First, the flexible direct-current transmission converter of symmetrical bipolar wiring judges whether transverter uses the bipolar band metallic return method of operation single-end earthed, and non-faulting pole to use bipolar power control model when occurring monopole failure;In this way, then according to failure pole powerP a, non-faulting pole powerP b, monopole rated powerP NCalculate and turned band quantity of power, make it equal toP aWithP NP bIn smaller value;Then, locking failure pole transverter, disconnection failure pole metallic return switch, make system switch to the monopole band metallic return method of operation single-end earthed;Then, Real-Time Model is set up according to transverter device parameter, simulation calculation goes out power and turns tape speed definite valueP N/t1;Finally, non-faulting pole power is turned into tape speed definite value according to power to rise toP bP.It is contemplated that power is provided when occurring monopole failure for symmetrical bipolar transverter turns band control method and theoretical foundation.

Description

Symmetrical bipolar flexible direct-current transmission converter power turns band control method
Technical field
The present invention relates to Technology of HVDC based Voltage Source Converter field, belong to the modular multilevel change of current using symmetrical bipolar wiring Device control technology, is specially that symmetrical bipolar transverter occurs after monopole failure, failure pole power is turned into band to the control of non-faulting pole Method processed.
Background technology
Flexible direct current power transmission system using symmetrical bipolar wiring has the flexible method of operation, and pole I, pole II can integrally be transported OK, also can isolated operation.Under nominal situation, system uses the bipolar band metallic return method of operation single-end earthed, and the two poles of the earth are uneven Electric current is returned by metallic return.When monopole breaks down, by failure pole change of current valve blocking, stop transport, while failure is extremely whole Or Partial Power is transferred to normal pole.Normal pole and metallic return switch to the monopole band metallic return method of operation, and operating current leads to Cross metallic return return.Now, engineering at most remains to the rated capacity of conveying 50%, reduces removal of load and AC network is rushed Degree is hit, power supply reliability is improved.
Lack at present and turn the research contents of band for power, but it is the fast-changing process of power that power, which turns the essence of band,. Works《High voltage dc transmission technology based on voltage source converter》Propose that DC bus capacitor discharge and recharge can be completed in 2ms;Text Offer《The operation characteristic research of symmetrical bipolar flexible direct current transmission system》When emulating converter valve operation characteristic, it can be achieved in 30ms Power step from 200MW to 400MW;Document《Design and the operation characteristic experiment of flexible direct current power transmission system》The change of current of emulation Valve trend Umklapp process can be completed in 40ms and DC voltage is without fluctuation;Document《Xiamen flexible DC power transmission engineering power is dashed forward Become phenomenon and optimisation strategy》Analyze that DC control system control time is asynchronous to cause the mechanism of reactive power jumping phenomenon, And propose optimisation strategy.Above research contents thinks that flexible direct current power transmission system can quickly realize active power change, rank Jump is even inverted, but according to the built flexible DC power transmission engineering test number in the country it has been found that active power instruction change compared with DC bus-bar voltage can be caused to fluctuate when fast, even result in DC over-voltage protection action and trip.To ensure that power turns band process Smoothly complete, it is necessary to propose that power turns band control method and optimizes associated control parameters.
In view of power turns the present situation lacked with control method at present, the present invention proposes the symmetrical bipolar flexible DC power transmission change of current Device power turns band control method.This method proposes that power turns the feasibility condition of band first;Then according to failure pole and non-faulting Pole performance number proposes to be turned the calculating process with quantity of power;Emulation mould is set up by introducing the physical device such as direct current cables parameter Type, proposes that power turns the setting method of tape speed parameter according to simulation result;Finally propose that power turns band control flow.By this Power when to transverter monopole failure occurs for the control method provided is invented to turn to adjust with process analysis procedure analysis and associated control parameters Have great importance.
The content of the invention
Turn band control method it is an object of the invention to provide a kind of symmetrical bipolar flexible direct-current transmission converter power, make Transverter occurs to effectively reduce DC bus-bar voltage fluctuation when failure pole power is quickly turned band to non-faulting pole by monopole failure.This On the one hand invention illustrates power and turns the feasibility condition of band and provide specific control flow;On the other hand propose and turned band power Amount and power turn calculating and the setting method of tape speed parameter.Power is provided when occurring monopole failure by the present invention for transverter Turn band control method, be that associated control parameters adjust offer theoretical foundation and technical support.
To achieve the above object, the technical scheme is that:A kind of symmetrical bipolar flexible direct-current transmission converter power Turn band control method, comprise the following steps,
Step S1:Band feasibility condition is turned according to power and judges whether symmetrical bipolar flexible direct-current transmission converter can carry out work( Rate turns band;
Step S2:According to failure pole powerP a, non-faulting pole powerP b, monopole rated powerP NNumerical computations by turn band a power Measure ΔP
Step S3:Locking failure pole transverter, disconnection failure pole metallic return switch, make system switch to monopole band metallic return list The end ground connection method of operation;
Step S4:Non-faulting pole power is turned into tape speed definite value according to power to rise toP bP
Further, in the step S1, it is that transverter uses bipolar band metallic return list that power, which turns band feasibility condition, The end ground connection method of operation, and non-faulting pole uses bipolar power control model.
Further, in the step S2, band quantity of power Δ is turnedPCalculate as follows:
Turned band quantity of power and should be less than the extremely former performance number of failure:
The extremely original power of non-faulting should be less than monopole rated power plus the power for turning band:
Turned that the greatest measure for meeting above formula condition should be taken with quantity of power, to reduce shadow of the removal of load to AC system Ring, therefore, being turned band power numerical quantity is:
(1).
Further, in the step S4, power turns tape speed definite value and adjusted according to the following steps:
Step S41:Real-Time Model is set up according to symmetrical bipolar flexible direct-current transmission converter device parameter;
Step S42:Transverter is set to the bipolar band metallic return method of operation, failure extremely monopole power single-end earthed in model Control, non-faulting extremely bipolar power control, failure pole powerP aFor rated power, non-faulting pole powerP bIt is zero;
Step S43:Non-faulting pole power in model is setP bRisen to from zeroP NTime t1, power in simulation model is turned belt speed Rate isP N/t1
Step S44:Difference turns under tape speed, and simulation calculation obtains retention time of the DC voltage more than 1.15 times of rated voltages t2
Step S45:t2During more than or equal to 20ms, I section of action of transverter DC over-voltage protection, by t1Increase Δ t, repeat step S43、S44;t2During less than 20ms, I section of transverter DC over-voltage protection is failure to actuate, into step S46;
Step S46:Determine t1Numerical value, power, which turns tape speed fixed value adjusting result, isP N/t1
Further, in the step S44, retention time t of the DC voltage more than 1.15 times of rated voltages2By with lower section Method carries out simulation calculation:
Input to the active power instantaneous value of any one phase upper and lower bridge arm of non-faulting pole transverter and be represented by:
(2)
WhereinU sFor alternating voltage virtual value;I sFor alternating current virtual value;φ is alternating voltage current and phase difference;U dcFor direct current Voltage;I dcFor DC current;
During power turns band, non-faulting pole AC input power is lifted rapidly, but due to direct current cables equivalent reactance Metering function, DC current climbing speed is slower, and converter valve AC input power is more than electricity on DC side power output, bridge arm Hold voltage rise, the energy variation amount of the active power of bridge arm in the unit interval is equal to the increased energy of electric capacity:
(3)
In formulaC 0For submodule electric capacity,NFor every bridge arm submodule quantity,U dcFor current time DC voltage,ΔU dcFor direct current Press variable quantity;
It can be recognized using DC voltage control mode using power control mode, opposite end due to flexible direct-current transmission converter one end Keep constant for opposite end DC voltage, thereforeΔU dcIt is exactly the voltage variety on direct current cables,ΔU dcSubtract direct current cables etc. Imitate resistancerOn voltage, i.e. voltage in direct current cables equivalent reactance, and then calculate and obtain change in the DC current unit interval Amount
(4)
WhereinLThe equivalent reactance of direct current cables;rFor the equivalent resistance of direct current cables;
Subsequent time DC voltage value and current value are:
(5)
Different capacity is obtained by above formula iterative and turns DC voltage waveform under tape speed, according to waveshape direct current Retention time t of the voltage more than 1.15 times of rated voltages2
Compared to prior art, the invention has the advantages that:By experimental verification, controlling party proposed by the present invention Method, can make power during transverter generation monopole failure turn band process and smoothly complete, it is to avoid DC bus-bar voltage fluctuation is excessive to be led Cause DC over-voltage protection action and trip, reduce the impact degree to AC network, improve power supply reliability.
Brief description of the drawings
Fig. 1 is that power of the present invention turns band control flow chart.
Fig. 2 is symmetrical bipolar flexible direct-current transmission converter main wiring circuit figure.
Fig. 3 is that power of the present invention turns tape speed setting method flow chart.
Fig. 4 is that power of the present invention turns DC voltage waveform during band.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
As shown in figure 1, a kind of symmetrical bipolar flexible direct-current transmission converter power of the present invention turns band control method, including Following steps,
Step 1:Band feasibility condition is turned according to power and judges whether symmetrical bipolar flexible direct-current transmission converter can carry out work( Rate turns band;
Step 2:According to failure pole powerP a, non-faulting pole powerP b, monopole rated powerP NNumerical computations by turn band a quantity of power ΔP
Step 3:Locking failure pole transverter, disconnection failure pole metallic return switch, make system switch to monopole band metallic return list The end ground connection method of operation;
Step 4:Non-faulting pole power is turned into tape speed definite value according to power to rise toP bP
In step 1, it is that transverter uses the bipolar band metallic return side of operation single-end earthed that power, which turns band feasibility condition, Formula, and non-faulting pole uses bipolar power control model.
Symmetrical bipolar flexible direct-current transmission converter main wiring circuit is as shown in Fig. 2 transverter is returned using bipolar band metal Line single-end earthed the method for operation when, if monopole breaks down, control and protection system can by failure pole change of current valve blocking, disconnect pole NBS Switch, makes system switch to monopole band metallic return and runs single-end earthed.Failure pole power quickly turns band to non-faulting pole, it is possible to decrease Influence of the removal of load to AC system, improves flexible direct-current transmission converter operational reliability.
Pole I, the control mode of pole II current conversion stations are divided into bipolar power control and monopole Power Control both of which, pole I, pole II can two kinds of control models of flexible combination.It is when taking sending end current conversion station, S2 as receiving end current conversion station, the generation monopole failure of pole I of S1 It is as shown in table 1 that example, adoptable control mode and power turn band feasibility condition.
1st, it is bipolar to be controlled using bipolar power
Active power can turn all or part of power on band extremely II in two interpolar mean allocations when monopole failure occurs for pole I.
2nd, pole I is controlled using monopole Power Control, pole II using bipolar power
Monopole power control instruction sets the active power value of pole I, and bipolar power control instruction sets bipolar total active power value, Therefore the active power value of pole II subtracts the monopole power of pole I equal to general power.Can be by all or part when monopole failure occurs for pole I Power turns band extremely II.
3rd, pole I uses monopole Power Control using bipolar power control, pole II
When monopole failure occurs for pole I, because the power of pole II is set by monopole power control instruction, the power of pole I can not be turned Band extremely II, will occur removal of load phenomenon.
4th, it is bipolar to use monopole Power Control
Power can not be turned to band extremely II when monopole failure occurs for pole I, occur removal of load phenomenon.
Therefore, the feasibility condition that power turns band is:Current conversion station uses the bipolar band metallic return method of operation single-end earthed, And non-faulting pole uses bipolar power control model;
In step 2, calculate as follows being turned band quantity of power:
Turned band quantity of power and should be less than the extremely former performance number of failure:
The extremely original power of non-faulting should be less than monopole rated power plus the power for turning band:
Turned that the greatest measure for meeting above formula condition should be taken with quantity of power, to reduce shadow of the removal of load to AC system Ring, therefore, being turned band power numerical quantity is:
(1).
In step 4, adjusted as shown in figure 3, turning tape speed definite value to power as follows:
Step 41:Real-Time Model is set up according to symmetrical bipolar flexible direct-current transmission converter device parameter;
Step 42:Transverter is set to the bipolar band metallic return method of operation, failure extremely monopole power single-end earthed in model Control, non-faulting extremely bipolar power control, failure pole powerP aFor rated power, non-faulting pole powerP bIt is zero;
Step 43:Non-faulting pole power in model is setP bRisen to from zeroP NTime t1, power in simulation model is turned tape speed ForP N/t1
Step 44:Difference turns under tape speed, and simulation calculation obtains retention time t of the DC voltage more than 1.15 times of rated voltages2
Step 45:t2During more than or equal to 20ms, I section of action of transverter DC over-voltage protection, by t1Increase Δ t, repeat step 43, 44;t2During less than 20ms, I section of transverter DC over-voltage protection is failure to actuate, into step 46;
Step 46:Determine t1Numerical value, power, which turns tape speed fixed value adjusting result, isP N/t1
In step 44, retention time t of the DC voltage more than 1.15 times of rated voltages2Emulation meter is carried out by the following method Calculate:
Input to the active power instantaneous value of any one phase upper and lower bridge arm of non-faulting pole transverter and be represented by:
(2)
WhereinU sFor alternating voltage virtual value;I sFor alternating current virtual value;φ is alternating voltage current and phase difference;U dcFor direct current Voltage;I dcFor DC current;
During power turns band, non-faulting pole AC input power is lifted rapidly, but due to direct current cables equivalent reactance Metering function, DC current climbing speed is slower, and converter valve AC input power is more than electricity on DC side power output, bridge arm Hold voltage rise, the energy variation amount of the active power of bridge arm in the unit interval is equal to the increased energy of electric capacity:
(3)
In formulaC 0For submodule electric capacity,NFor every bridge arm submodule quantity,U dcFor current time DC voltage,ΔU dcFor direct current Press variable quantity;
It can be recognized using DC voltage control mode using power control mode, opposite end due to flexible direct-current transmission converter one end Keep constant for opposite end DC voltage, thereforeΔU dcIt is exactly the voltage variety on direct current cables,ΔU dcSubtract direct current cables etc. Imitate resistancerOn voltage, i.e. voltage in direct current cables equivalent reactance, and then calculate and obtain change in the DC current unit interval Amount
(4)
WhereinLThe equivalent reactance of direct current cables;rFor the equivalent resistance of direct current cables;
Subsequent time DC voltage value and current value are:
(5)
Different capacity is obtained by above formula iterative and turns DC voltage waveform under tape speed, as shown in Figure 4.According to figure 4 waveforms can obtain retention time t of the DC voltage more than 1.15 times of rated voltages2
The object, technical solutions and advantages of the present invention are described in detail above, be should be understood that described above Only presently preferred embodiments of the present invention, is not intended to limit the invention, within the spirit and principles of the invention, is made Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.

Claims (5)

1. a kind of symmetrical bipolar flexible direct-current transmission converter power turns band control method, it is characterised in that:Comprise the following steps,
Step S1:Band feasibility condition is turned according to power and judges whether symmetrical bipolar flexible direct-current transmission converter can carry out work( Rate turns band;
Step S2:According to failure pole power, non-faulting pole power, monopole rated powerNumerical computations by turn band a work( Rate amount
Step S3:Locking failure pole transverter, disconnection failure pole metallic return switch, make system switch to monopole band metallic return list The end ground connection method of operation;
Step S4:Non-faulting pole power is turned into tape speed definite value according to power to rise to
2. symmetrical bipolar flexible direct-current transmission converter power according to claim 1 turns band control method, its feature exists In:In the step S1, it is that transverter uses the bipolar band metallic return method of operation single-end earthed that power, which turns band feasibility condition, And non-faulting pole uses bipolar power control model.
3. symmetrical bipolar flexible direct-current transmission converter power according to claim 1 turns band control method, its feature exists In:In the step S2, turned band quantity of powerCalculate as follows:
Turned band quantity of power and should be less than the extremely former performance number of failure:
The extremely original power of non-faulting should be less than monopole rated power plus the power for turning band:
Turned that the greatest measure for meeting above formula condition should be taken with quantity of power, to reduce shadow of the removal of load to AC system Ring, therefore, being turned band power numerical quantity is:
(1).
4. symmetrical bipolar flexible direct-current transmission converter power according to claim 1 turns band control method, its feature exists In:In the step S4, power turns tape speed definite value and adjusted according to the following steps:
Step S41:Real-Time Model is set up according to symmetrical bipolar flexible direct-current transmission converter device parameter;
Step S42:Transverter is set to the bipolar band metallic return method of operation, failure extremely monopole power single-end earthed in model Control, non-faulting extremely bipolar power control, failure pole powerFor rated power, non-faulting pole powerIt is zero;
Step S43:Non-faulting pole power in model is setRisen to from zeroTime, power in simulation model is turned band Speed is
Step S44:Difference turns under tape speed, and emulation obtains retention time of the DC voltage more than 1.15 times of rated voltages
Step S45:During more than or equal to 20ms, the I section of action of transverter DC over-voltage protection willIncrease, repeat step S43、S44;During less than 20ms, I section of transverter DC over-voltage protection is failure to actuate, into step S46;
Step S46:It is determined thatNumerical value, power, which turns tape speed fixed value adjusting result, is
5. symmetrical bipolar flexible direct-current transmission converter power according to claim 4 turns band control method, its feature exists In:In the step S44, retention time of the DC voltage more than 1.15 times of rated voltagesEmulation meter is carried out by the following method Calculate,
Input to the active power instantaneous value of any one phase upper and lower bridge arm of non-faulting pole transverter and be represented by:
(2)
WhereinFor alternating voltage virtual value;For alternating current virtual value;For alternating voltage current and phase difference;To be straight Flow voltage;For DC current;
During power turns band, non-faulting pole AC input power is lifted rapidly, but due to direct current cables equivalent reactance Metering function, DC current climbing speed is slower, and converter valve AC input power is more than electricity on DC side power output, bridge arm Hold voltage rise, the energy variation amount of the active power of bridge arm in the unit interval is equal to the increased energy of electric capacity:
(3)
In formulaFor submodule electric capacity,For every bridge arm submodule quantity,For current time DC voltage,For direct current Voltage variety;
It can be recognized using DC voltage control mode using power control mode, opposite end due to flexible direct-current transmission converter one end Keep constant for opposite end DC voltage, thereforeIt is exactly the voltage variety on direct current cables,Subtract direct current cables etc. Imitate resistancerOn voltage, i.e. voltage in direct current cables equivalent reactance, and then calculate and obtain change in the DC current unit interval Amount
(4)
WhereinFor the equivalent reactance of direct current cables;For the equivalent resistance of direct current cables;
Subsequent time DC voltage value and current value are:
(5)
Different capacity is obtained by above formula iterative and turns DC voltage waveform under tape speed, according to waveshape direct current Retention time of the voltage more than 1.15 times of rated voltages
CN201710259291.XA 2017-04-20 2017-04-20 Power band-turning control method for symmetrical bipolar flexible direct-current transmission converter Active CN107039993B (en)

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CN108418228A (en) * 2018-03-28 2018-08-17 许继电气股份有限公司 A kind of active power controller method when converter fault and flexible direct current power grid
CN108448549A (en) * 2018-05-09 2018-08-24 华中科技大学 The flexible direct current line protection method of power is measured based on current-limiting reactor
CN109193731A (en) * 2018-08-29 2019-01-11 许继电气股份有限公司 A kind of Poewr control method when flexible direct current network system receiving end failure
CN109193747A (en) * 2018-11-09 2019-01-11 国网经济技术研究院有限公司 Bipolar flexible DC grid neutral conductor change-over switch configures system and conversion method
CN109307825A (en) * 2018-10-26 2019-02-05 中国电力科学研究院有限公司 A kind of method and system obtaining soft straight power grid direct current monopolar line failure measure amount
CN109494779A (en) * 2018-10-26 2019-03-19 中国电力科学研究院有限公司 A kind of method and system obtaining soft straight line commutation device locking failure measure amount
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107800130A (en) * 2017-11-06 2018-03-13 许继电气股份有限公司 The Poewr control method and system of the more current conversion stations of the active flexible direct current system of multiterminal
CN107800130B (en) * 2017-11-06 2020-04-14 许继电气股份有限公司 Power control method and system for multi-converter station of multi-terminal active flexible direct current system
CN108418228A (en) * 2018-03-28 2018-08-17 许继电气股份有限公司 A kind of active power controller method when converter fault and flexible direct current power grid
CN108448549A (en) * 2018-05-09 2018-08-24 华中科技大学 The flexible direct current line protection method of power is measured based on current-limiting reactor
CN109193731A (en) * 2018-08-29 2019-01-11 许继电气股份有限公司 A kind of Poewr control method when flexible direct current network system receiving end failure
CN109307825A (en) * 2018-10-26 2019-02-05 中国电力科学研究院有限公司 A kind of method and system obtaining soft straight power grid direct current monopolar line failure measure amount
CN109494779A (en) * 2018-10-26 2019-03-19 中国电力科学研究院有限公司 A kind of method and system obtaining soft straight line commutation device locking failure measure amount
CN109193747A (en) * 2018-11-09 2019-01-11 国网经济技术研究院有限公司 Bipolar flexible DC grid neutral conductor change-over switch configures system and conversion method
CN109193747B (en) * 2018-11-09 2021-08-10 国网经济技术研究院有限公司 Operation mode conversion method for bipolar flexible direct-current power grid neutral line conversion switch
CN111769581A (en) * 2020-06-09 2020-10-13 中国南方电网有限责任公司超高压输电公司检修试验中心 Three-terminal direct-current transmission project fault power coordination control method
CN111769581B (en) * 2020-06-09 2021-08-27 中国南方电网有限责任公司超高压输电公司检修试验中心 Three-terminal direct-current transmission project fault power coordination control method

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