CN108809113A - A kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method and system - Google Patents
A kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method and system Download PDFInfo
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- CN108809113A CN108809113A CN201810635173.9A CN201810635173A CN108809113A CN 108809113 A CN108809113 A CN 108809113A CN 201810635173 A CN201810635173 A CN 201810635173A CN 108809113 A CN108809113 A CN 108809113A
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- arrester
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- 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
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- 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 a kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method and system, including the following contents：Several arresters are prepared on the main electrical scheme of existing symmetrical monopolar flexible direct current engineering current conversion station, arrester includes arrester, direct current pole busbar arrester, DC line arrester and tietransformer valve side neutral point MOA between tietransformer valve side arrester, bridge arm reactance valve side arrester, bridge arm reactance terminal, by the characteristic parameter of each arrester of determination, the Insulation Coordination of symmetrical monopolar flexible direct current engineering current conversion station is realized.By the characteristic parameter of each arrester of determination, the Insulation Coordination of symmetrical monopolar flexible direct current engineering current conversion station is realized, the very big overvoltage level for limiting current conversion station reduces the design difficulty and construction investment level of engineering.
Description
Technical field
The present invention relates to a kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method and system, belong to flexible straight
Flow field of power transmission.
Background technology
Flexible DC transmission technology (Flexible HVDC) is the direct current transportation of new generation using voltage source converter as core
Technology, it represents the developing direction of the following HVDC Transmission Technology, is a forward-looking and guiding transmission & distribution power technology,
It is to realize one of the important means of reliable power supply, economy, safety.Engineering experience shows compared with conventional AC is transmitted electricity, similarly
Transmission of electricity corridor, the ability to transmit electricity of flexible DC transmission technology is about 1.5 times of transmission line of alternation current, convenient for saving soil in short supply
Resource；Compared with traditional direct current transportation, flexible DC power transmission using flexible quick control mode, can to active power,
Reactive power is independently controlled, and realizes the power transmission to passive network, overcomes the essential defect of customary DC transmission of electricity.
The research of flexible DC transmission technology is in technology and continuously improves, the ever-increasing high speed development of engineer application
Phase, Zhoushan engineering, Nan'ao engineering, Xiamen engineering have been enter into the operation phase, Chongqing Hubei Province back-to-back, Zhangbei County's flexible direct current electricity power engineering
Have been enter into the construction period.Overvoltage and insulation coordination is one of the key technology of flexible DC power transmission engineering construction, research pair
Design, manufacture and the experiment of change of current station equipment and overhead line structures have great importance.Study a kind of Insulation Coordination method solution
Certainly the problem of the excessively high dielectric level of symmetrical monopolar flexible direct current engineering current conversion station is very important.
Invention content
In view of the above-mentioned problems, the object of the present invention is to provide a kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordinations
Method and system, the very big overvoltage level for limiting current conversion station, reduce the design difficulty and construction investment level of engineering.
To achieve the above object, the present invention takes following technical scheme：A kind of symmetrical monopolar flexible direct current engineering current conversion station
Insulation Coordination method, it is characterised in that including the following contents：It is connect in the master of existing symmetrical monopolar flexible direct current engineering current conversion station
Several arresters are prepared on line, arrester includes tietransformer valve side arrester, bridge arm reactance valve side arrester, bridge arm reactance
Arrester, direct current pole busbar arrester, DC line arrester and tietransformer valve side neutral point MOA between terminal,
In, tietransformer valve side arrester is arranged between tietransformer and bridge arm reactor, and bridge arm reactance valve side arrester is set
It sets between bridge arm reactor and converter valve, arrester is arranged between two terminals of bridge arm reactance between bridge arm reactance terminal,
Direct current pole busbar arrester is arranged on the busbar of direct current pole, and the line outlet in direct current pole busbar is arranged in DC line arrester
Place, tietransformer valve side neutral point MOA are arranged in tietransformer valve side neutral point；Pass through the spy of each arrester of determination
Parameter is levied, realizes the Insulation Coordination of symmetrical monopolar flexible direct current engineering current conversion station.
Further, the characteristic parameter selection of each arrester includes the continuous running voltage of arrester, the ginseng of arrester
Examine voltage, the cooperation electric current of arrester and the energy parameter of arrester.
Further, the continuous running voltage of each arrester is specifically configured to：
A：The continuous running voltage of bridge arm reactance valve side arrester：Its continuous running voltage born takes under steady state operating conditions
ValueWherein, Ud is the maximum DC operating voltage of engineering；
B：The continuous running voltage of tietransformer valve side arrester：In the continuous running voltage of net side exchange side arrester
On the basis of, it is obtained by the no-load voltage ratio of transformer；
C：The continuous running voltage of direct current pole busbar arrester and DC line arrester：System maximum DC voltage is superimposed
A small amount of ripple voltage, the amplitude of voltage depend on the control system of both ends transverter, it is therefore an objective to so that the chargeability of arrester compared with
It is low；
D：Residual voltage is multiplied by the alternating current by it by the induction reactance value of reactor between bridge arm reactance terminal
Stream；
E：The continuous running voltage of tietransformer valve side neutral point MOA：Consider tietransformer, neutral point
Under conditions of ground resistance, arrester equipment economy, configured by building PSCAD models progress over-voltage simulation.
Further, the reference voltage of each arrester is specifically configured to：In symmetrical monopolar flexible direct current system, direct current pole
The chargeability of busbar arrester and DC line arrester is no more than 0.7, tietransformer valve side arrester, bridge arm reactance valve side
The chargeability of arrester is 0.78~0.82, arrester and tietransformer net side neutral point MOA NV between bridge arm reactance terminal
Chargeability be no more than 0.5.
Further, the cooperation electric current of each arrester is imitative to building the PSCAD model overvoltage containing arrester by system
It is exact fixed.
Further, each arrester energy parameter of DC side is excessively electric to building the PSCAD models containing arrester by system
Pressure emulation determines.
To achieve the above object, the present invention takes following technical scheme：A kind of symmetrical monopolar flexible direct current engineering current conversion station
Insulation Coordination system, which is characterized in that including tietransformer valve side arrester, bridge arm reactance valve side arrester, bridge arm reactance
Arrester, direct current pole busbar arrester, DC line arrester and tietransformer valve side neutral point MOA between terminal,
In, tietransformer valve side arrester is arranged between tietransformer and bridge arm reactor, bridge arm reactance valve side
Arrester is arranged between bridge arm reactor and converter valve, and arrester is arranged the two of bridge arm reactance between the bridge arm reactance terminal
Between a terminal, the direct current pole busbar arrester is arranged on the busbar of direct current pole, and the DC line arrester is arranged straight
At the line outlet for flowing pole busbar, neutral point MOA setting in tietransformer valve side is in tietransformer valve side neutrality
Point.
Further, the characteristic parameter selection of each arrester includes the continuous running voltage of arrester, arrester
Reference voltage, arrester cooperation electric current and arrester energy parameter.
The invention adopts the above technical scheme, which has the following advantages：1, the present invention is soft in existing symmetrical monopolar
Several arresters are prepared on the main electrical scheme of property DC engineering current conversion station；By the characteristic parameter of each arrester of determination, realize symmetrical
The Insulation Coordination of monopole flexible direct current engineering current conversion station, the very big overvoltage level for limiting current conversion station, reduces engineering
Design difficulty and construction investment level.Foundation is provided to the development of equipment, is laid a good foundation for the implementation of engineering.2, originally
The arrester of the setting of invention includes between tietransformer valve side arrester, bridge arm reactance valve side arrester, bridge arm reactance terminal
Arrester, direct current pole busbar arrester, DC line arrester, tietransformer valve side neutral point MOA, rationally effectively really
The dielectric level of the overvoltage protection level and equipment of each key point of symmetrical monopolar flexible direct current converter station DC side is determined, pair has set
Standby development provides foundation, lays a good foundation for the implementation of engineering.
Description of the drawings
Fig. 1 is symmetrical monopolar flexible direct current engineering current conversion station protection of arrester configuration diagram；
Fig. 2 is the typical waveform schematic diagram of the steady-state voltage of symmetrical monopolar flexible direct current converter station each point, wherein its
In, figure (a)~(e) be respectively between tietransformer valve side arrester AV, bridge arm reactance valve side arrester LV, valve end, bridge arm electricity
Arrester AR and the typical waveform of the direct current pole positions busbar arrester DB between anti-terminal, wherein horizontal axis indicate the time, selection
Time span is 20ms, and engineering voltage class is different, and corresponding steady state voltage is different.
Specific implementation mode
Come to carry out detailed description to the present invention below in conjunction with attached drawing.It should be appreciated, however, that attached drawing has been provided only more
Understand the present invention well, they should not be interpreted as limitation of the present invention.
As shown in Fig. 1~2, symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method provided by the invention, including
The following contents：
1, several arresters are prepared on the main electrical scheme of existing symmetrical monopolar flexible direct current engineering current conversion station, it is specific to prepare
Process is：
The arrester that the present invention prepares includes tietransformer valve side arrester AV, bridge arm reactance valve side arrester LV, bridge
Arrester AR, direct current pole busbar arrester DB, DC line arrester DL and tietransformer valve side are neutral between arm reactance terminal
Point arrester NV, wherein tietransformer valve side arrester AV is arranged between tietransformer and bridge arm reactor, bridge arm electricity
Anti- valve side arrester LV is arranged between bridge arm reactor and converter valve, and arrester AR settings are in bridge arm electricity between bridge arm reactance terminal
Between two anti-terminals, direct current pole busbar arrester DB is arranged on the busbar of direct current pole, and the DL settings of DC line arrester exist
At the line outlet of direct current pole busbar, neutral point MOA NV settings in tietransformer valve side are in tietransformer valve side neutrality
Point.
2, the CCOV (continuous running voltage) of each arrester is set
1) CCOV of bridge arm reactance valve side arrester LV
In symmetrical monopolar system, bridge arm reactance valve side arrester LV is selected according to alternating-current lightning arrestor, under steady state operating conditions
Its continuous running voltage born is that fundamental frequency alternating voltage is superimposed the harmonic voltage generated by system.According to flexible direct current system
The peak value of operation logic, AC wave shape can reach the maximum DC operating voltage Ud of engineering, so its continuous running voltage is general
ValueThe switching overvoltage that bridge arm reactance valve side arrester LV is born needs to consider bridge arm reactor valve side two
Operating modes such as ground connection etc. in phase short trouble or single-phase earthing fault and direct-current polar station.
2) CCOV of tietransformer valve side arrester AV
In symmetrical monopolar system, the selection principle of tietransformer valve side arrester AV is similar to exchange side arrester,
Only tietransformer valve side arrester AV may be non-standard arrester, and the CCOV of tietransformer valve side arrester AV is general
On the basis of the CCOV of net side exchange side arrester, obtained by the no-load voltage ratio (considering most minus tapping) of transformer.Couple transformation
The switching overvoltage that device valve side arrester AV is born needs to consider bridge arm reactor valve side two-phase short-circuit fault and direct current pole
The operating modes such as ground connection in line station.
4) CCOV of direct current pole busbar arrester DB and DC line arrester DL
Direct current pole busbar arrester DB is for protecting the equipment for being connected to direct current pole busbar.In general, to consider lightning ingress
Busbar arrester DB guard spaces in direct current pole under wave overvoltage, should to be mounted on according to thunder intrusion result of calculation
The emphasis equipment of direct current pole busbar different location is adequately protected, therefore can install more direct current pole busbar arrester DB.
The arrester of circuit (cable) inlet installation is considered as DC line (direct current cables) arrester DL.
The CCOV of direct current pole busbar arrester DB and DC line arrester DL are that the superposition of system maximum DC voltage is a small amount of
Ripple voltage, the size of ripple voltage depend on the control system of both ends transverter, select the chargeability of arrester is relatively low more to close
Reason.
Direct current pole busbar arrester DB and DC line arrester DL major limitation thunder intrusions.For symmetrical
For monopolar DC system, the switching overvoltage of direct current pole busbar arrester DB and DC line arrester DL mainly consider bridge arm reactance
Device single-phase earthing or to pole ground fault etc..
5) CCOV of arrester is multiplied by the alternating current by it by the induction reactance value of reactor between bridge arm reactance terminal.
6) CCOV of tietransformer valve side neutral point MOA NV
Tietransformer valve side neutral point MOA NV is typically located at the valve side neutral point of symmetrical monopolar system transformer.
Since transformer neutral point is configured with bigger resistance, in order to control the insulation of transformer neutral point under polar curve earth fault
Level, therefore configure tietransformer valve side neutral point MOA NV.Tietransformer valve side neutral point MOA NV is transported in stable state
Working voltage is very low under row operating mode, does not generally do specific requirement to its CCOV.Its specific operation protection is horizontal, generally in synthesis
Under conditions of considering tietransformer, neutral resistance, the equipment economy such as arrester, by build PSCAD models into
Row over-voltage simulation is distributed rationally.
3, the la tension de reference Uref est of each arrester of DC side is selected
The DC reference voltage Uref of voltage source converter valve DC side arrester is defined as resistor disc direct current ginseng in engineering
Examine the voltage under electric current.Being specifically chosen the corresponding reference current of reference voltage can be related to resistor disc unit area current density.
After the Uref that all types of arresters are determined, its corresponding level of protection can be determined substantially.The size of chargeability depends on oxygen
Change the characteristic of zinc resistor disc, the nonlinear factor of such as VA characteristic curve is superimposed having under harmonic voltage on DC voltage
The temperature of the energy of releasing, installation site (indoor or outdoor) that allow under work(loss size, the aging characteristics of long-term work, overvoltage
Degree and filthy influence and heat dissipation characteristics.
Consider the reliability and economy of equipment, in symmetrical monopolar flexible direct current system, direct current pole busbar arrester
The chargeability of DB and DC line arrester DL are no more than 0.7, for tietransformer valve side arrester AV, bridge arm reactance valve
Side arrester LV arresters can refer to alternating-current lightning arrestor selection, usual tietransformer valve side arrester AV, bridge arm reactance valve side
The chargeability of arrester LV is 0.78~0.82, and arrester AR and tietransformer net side neutral point are lightning-arrest between bridge arm reactance terminal
The chargeability of device NV is no more than 0.5, and under polar curve ground fault condition occurs near current conversion station, symmetrical monopolar system is than symmetrical
The overvoltage that bipolar DC system generates is high, so the direct current arrester in symmetrical monopolar flexible direct current system is recommended to choose lower lotus
Electric rate.
4, the cooperation electric current of DC side arrester is determined
Cooperation current value is emulated by system overvoltage and is determined (by building the PSCAD models containing arrester),
This is not limited, and can be determined according to actual conditions.Research need to consider that energy, separate unit that all types of arresters absorb are lightning-arrest
Need parallel column number and separate unit lightning arrester discharge current peak, the value related to the arrester quantity of its parallel connection outside inside device.Match
The corresponding residual voltage of electric current is closed to determine by the representative overvoltage on the arrester directly (abutting) protection equipment.The research
Journey is to calculate in arrester arrangement and parameter selection and repeatedly adjustment between by its directly the requirement withstanding voltage of protection equipment, is sought
Look for optimal balance point.Final result is preferably to go out to coordinate electric current.For can suffer from the flexible direct current converter station equipment of direct lightning strike,
Determine that arrester lightning impulse cooperation electric current is considered as current conversion station lightning conducter and lightning rod and the united shielding design of needlework.
5, DC side arrester energy parameter
Direct current arrester energy parameter (is kept away as cooperation electric current, and by system overvoltage emulation by building to contain
The PSCAD models of thunder device) it determines.The energy of DC side arrester and current conversion station fault type and duration, control and
The response speed of protection and delay time are closely related.The duration meeting of lightning arrester discharge electric current under different overvoltage events
It is varied from.Ratio energy (kJ/kV) requirement of arrester can be reduced by improving the reference voltage (Uref) of arrester.It is kept away in regulation
When thunder device absorbs energy, the calculated energy value of reply system research considers a rational factor of safety.This factor of safety
Value range be 0%~20%, the factor depend on calculating the tolerance of input data, model used and higher than studied certainly
Determine the probability of arrester energy events appearance.
6, it by carrying out rational arrester combination configuration and parameter selection to symmetrical monopolar flexible direct current converter station, realizes
The Insulation Coordination of symmetrical monopolar flexible direct current engineering current conversion station.Straight-flow system occurs under over-voltage condition, and arrester is in high current
Effect is lower is presented low resistance characteristic, and effective limit value residual voltage at arrester both ends, the entirety for significantly limiting current conversion station are excessively electric
Voltage levels reduce the design difficulty and construction investment level of engineering.
The present invention also provides symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination systems, including tietransformer valve
It is arrester AR between side arrester AV, bridge arm reactance valve side arrester LV, bridge arm reactance terminal, direct current pole busbar arrester DB, straight
Flow Line arrester DL and tietransformer valve side neutral point MOA NV, wherein tietransformer valve side arrester AV is arranged
Between tietransformer and bridge arm reactor, bridge arm reactance valve side arrester LV setting bridge arm reactor and converter valve it
Between, arrester AR is arranged between two terminals of bridge arm reactance between bridge arm reactance terminal, direct current pole busbar arrester DB settings
On the busbar of direct current pole, DC line arrester DL is arranged at the line outlet of direct current pole busbar, in tietransformer valve side
Property point arrester NV be arranged in tietransformer valve side neutral point.
The various embodiments described above are merely to illustrate the present invention, and each implementation steps etc. of wherein method are all that can be varied from
, every equivalents carried out based on the technical solution of the present invention and improvement should not exclude the protection in the present invention
Except range.
Claims (8)
1. a kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method, it is characterised in that including the following contents：
Several arresters are prepared on the main electrical scheme of existing symmetrical monopolar flexible direct current engineering current conversion station, arrester includes connection
It is arrester between transformer valve side arrester, bridge arm reactance valve side arrester, bridge arm reactance terminal, direct current pole busbar arrester, straight
Flow Line arrester and tietransformer valve side neutral point MOA, wherein arrester setting in tietransformer valve side is coupling
Between transformer and bridge arm reactor, bridge arm reactance valve side arrester is arranged between bridge arm reactor and converter valve, bridge arm electricity
Arrester is arranged between two terminals of bridge arm reactance between anti-terminal, and direct current pole busbar arrester is arranged in direct current pole busbar
On, DC line arrester is arranged at the line outlet of direct current pole busbar, the setting of tietransformer valve side neutral point MOA
In tietransformer valve side neutral point；
By the characteristic parameter of each arrester of determination, the Insulation Coordination of symmetrical monopolar flexible direct current engineering current conversion station is realized.
2. symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method according to claim 1, which is characterized in that every
The characteristic parameter selection of one arrester includes the cooperation of the continuous running voltage of arrester, the reference voltage of arrester, arrester
The energy parameter of electric current and arrester.
3. symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method according to claim 1, which is characterized in that each
The reference voltage of arrester is specifically configured to：In symmetrical monopolar flexible direct current system, direct current pole busbar arrester and AC line
The chargeability of road arrester be no more than 0.7, tietransformer valve side arrester, bridge arm reactance valve side arrester chargeability be
0.78~0.82, the chargeability of arrester and tietransformer net side neutral point MOA NV are no more than between bridge arm reactance terminal
0.5。
4. symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method according to claim 1, which is characterized in that each
The cooperation electric current of arrester is determined by system to building the PSCAD model over-voltage simulations containing arrester.
5. symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method according to claim 1, which is characterized in that straight
The stream each arrester energy parameter in side is determined by system to building the PSCAD model over-voltage simulations containing arrester.
6. special according to Claims 1 to 5 any one of them symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination method
Sign is that the continuous running voltage of each arrester is specifically configured to：
A：The continuous running voltage of bridge arm reactance valve side arrester：Its continuous running voltage value born under steady state operating conditionsWherein, Ud is the maximum DC operating voltage of engineering；
B：The continuous running voltage of tietransformer valve side arrester：In the base of the continuous running voltage of net side exchange side arrester
On plinth, obtained by the no-load voltage ratio of transformer；
C：The continuous running voltage of direct current pole busbar arrester and DC line arrester：The superposition of system maximum DC voltage is a small amount of
Ripple voltage, the amplitude of voltage depend on the control system of both ends transverter, it is therefore an objective to so that the chargeability of arrester is relatively low；
D：Residual voltage is multiplied by the alternating current by it by the induction reactance value of reactor between bridge arm reactance terminal；
E：The continuous running voltage of tietransformer valve side neutral point MOA：Consider tietransformer, neutral ground
Under conditions of resistance, arrester equipment economy, configured by building PSCAD models progress over-voltage simulation.
7. a kind of symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination system, which is characterized in that including tietransformer valve
Arrester, direct current pole busbar arrester, DC line are kept away between side arrester, bridge arm reactance valve side arrester, bridge arm reactance terminal
Thunder device and tietransformer valve side neutral point MOA, wherein arrester setting in tietransformer valve side is in connection transformation
Between device and bridge arm reactor, bridge arm reactance valve side arrester is arranged between bridge arm reactor and converter valve, the bridge
Arrester is arranged between two terminals of bridge arm reactance between arm reactance terminal, and the direct current pole busbar arrester is arranged in direct current
On the busbar of pole, the DC line arrester is arranged at the line outlet of direct current pole busbar, in tietransformer valve side
Property point arrester be arranged in tietransformer valve side neutral point.
8. symmetrical monopolar flexible direct current engineering current conversion station Insulation Coordination system according to claim 7, which is characterized in that every
The characteristic parameter selection of one arrester includes the continuous running voltage of arrester, the reference voltage of arrester, arrester
Coordinate the energy parameter of electric current and arrester.
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| CN111162558B (en) * | 2020-02-03 | 2021-11-23 | 国家电网有限公司 | Main wiring system of back-to-back symmetrical single-pole flexible-straight system and selection method thereof |
| CN111585257A (en) * | 2020-05-22 | 2020-08-25 | 西安许继电力电子技术有限公司 | Overvoltage stress control method and device for flexible direct current converter valve |
| CN117154665A (en) * | 2023-09-06 | 2023-12-01 | 国网经济技术研究院有限公司 | Deep overvoltage suppression method for symmetrical monopole flexible-direct system |
| CN117154665B (en) * | 2023-09-06 | 2024-04-16 | 国网经济技术研究院有限公司 | Deep overvoltage suppression method for symmetrical monopole flexible-direct system |
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Application publication date: 20181113 |