CN110456209A - A kind of direct-current short circuit property judgment method and direct current system reclosing method - Google Patents
A kind of direct-current short circuit property judgment method and direct current system reclosing method Download PDFInfo
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- CN110456209A CN110456209A CN201910759530.7A CN201910759530A CN110456209A CN 110456209 A CN110456209 A CN 110456209A CN 201910759530 A CN201910759530 A CN 201910759530A CN 110456209 A CN110456209 A CN 110456209A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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Abstract
The invention discloses a kind of direct-current short circuit property judgment method and direct current system reclosing methods, it include: the mechanical DCCB separating brake of coupled mode after direct-current short circuit failure occurs, and the default alternating-current detection signal that mixed type MMC is generated is injected into DC power transmission line；Detection is located at the DC voltage response of the mechanical DCCB output end of coupled mode of DC power transmission line port；When DC voltage response is less than preset voltage criterion, then direct-current short circuit failure is permanent fault, and the mechanical switch of the mechanical DCCB of coupled mode is not closed, and waits the maintenance of DC transmission system line fault；Otherwise, direct-current short circuit failure is transient fault, is closed the mechanical switch of the mechanical DCCB of coupled mode；The present invention avoids the mechanical DCCB reclosing of coupled mode in permanent fault, reduces the requirement of flexible HVDC transmission system DCCB Breaking capacity mechanical to coupled mode, and accelerates resume speed of the direct current system after transient fault removing.
Description
Technical field
The invention belongs to flexible direct-current transmission fields, more particularly, to a kind of direct-current short circuit property judgment method
And direct current system reclosing method.
Background technique
Flexible direct current based on modularization multi-level converter (Modular multilevel converter, MMC) is defeated
Electric system has the characteristics that low decoupled active and reactive control, harmonic content, Yi Tuozhan, there is no commutation failures, send out in new energy
Electricity is grid-connected, regional power grid is asynchronous interconnects, has broad application prospects to passive system power supply etc..In view of it is remote,
Cost problem present in large capacity transmission, soft straight transmission system carry out extensive power transmission frequently with overhead transmission line.It is aerial
It is higher that transient fault probability occurs for transmission line of electricity, therefore need to configure effective method for restarting, and system is allowed to disappear in transient fault
Fast quick-recovery is operated normally to improve the utilization rate of flexible HVDC transmission system again after mistake.
Bridge-type MMC based on bridge-type submodule can be by being latched insulated gate bipolar transistor (Insulated
Gate Bipolar Transistor, IGBT) mode block fault current, design controller active control can also be passed through
Direct fault current.The power device number as needed for bridge-type MMC is 2 times of semi-bridge type MMC, increases the cost of inverter
And loss.Mixed type MMC is formed by bridge-type submodule and semi-bridge type sub-module cascade, can be controlled DC current, In
Active fault current limiting during failure is aided with low capacity dc circuit breaker isolated fault route, becomes and have both economy and skill
The selection of art advantage.
Flexible direct current power grid need to consider the cooperation of mixed type MMC and dc circuit breaker quickly to remove DC Line Fault so that
Sane system can run without interruption.After Fault Isolation, first waits route to go free completion, then unlock inverter or coincidence again
Lock dc circuit breaker (DC Circuit Breaker, DCCB), by judging whether route DC voltage is established, to realize to event
Hinder the judgement of property.If DC voltage restores, prove that failure has been removed, it can be with the normal operation of recovery system；If straight
Galvanic electricity pressure can not be restored, then be judged as permanent fault.There are certain blindness and reboot time to choose for this method for restarting
Improper problem can cause secondary hazards to system when restarting in permanent fault, be unfavorable for the safe operation of system, and
The secondary technical need cut-off proposes requirements at the higher level to the Breaking capacity and dissipation energy of dc circuit breaker.For based on mixed
Mould assembly MMC's makes somebody a mere figurehead soft lineal system, and still controllable DC voltage/current, has active Injection Signal during DC Line Fault
Ability.On the other hand, after main branch separating brake, change of current branch is still series among route the mechanical DCCB topology of coupled mode,
Circulation for inverter Injection Signal provides path.
Therefore, adaptive reclosing control technology inject based on mixed type MMC active signal is studied, it is soft to be that raising is maked somebody a mere figurehead
The important channel of property DC grid operational reliability.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of direct-current short circuit property judgment method and
Direct current system reclosing method, it is intended to solve existing flexible direct current system because that can not identify that direct-current short circuit nature of trouble leads to weight
It closes a floodgate in the permanent fault the problem of.
To achieve the above object, on the one hand, the present invention provides a kind of direct-current short circuit property judgment methods, comprising:
The mechanical DCCB separating brake of coupled mode after direct-current short circuit failure occurs, and mixed type MMC is generated into preset exchange
Detection signal is injected into DC power transmission line；
Detection is located at the DC voltage response of the mechanical DCCB output end of coupled mode of DC power transmission line port；
When the DC voltage response is less than preset voltage criterion, then direct-current short circuit failure is permanent fault；
Otherwise, direct-current short circuit failure is transient fault；
Wherein, the frequency of the preset alternating-current detection signal accesses the direct current transportation after short trouble according to change of current branch
The resonance frequency of route is set, and realizes that the preset alternating-current detection signal flows through the change of current branch of the mechanical DCCB of coupled mode；
The preset voltage criterion is accessed according to the amplitude of the preset alternating-current detection signal and the change of current branch
The parameter setting of DC power transmission line after short trouble.
Preferably, the preset alternating-current detection signal is generated by the DC current controller of mixed type MMC, when injection is pre-
If alternating-current detection signal when, the HVDC Modulation of DC current controller is than the frequency of signal and preset alternating-current detection signal
Frequency is consistent；
The injection length of preset alternating-current detection signal is cut-off for the mechanical DCCB of coupled mode and DC transmission system route
It goes after the completion of dissociating.
Preferably, when injecting preset alternating-current detection signal, the HVDC Modulation is 1pu~1.1pu than the amplitude of signal.
Preferably, DC transmission system includes DC power transmission line, mixed type MMC and the mechanical DCCB of coupled mode；
The both ends of each DC power transmission line are provided with the mechanical DCCB of coupled mode, the output of the mixed type MMC
The end connection mechanical DCCB of coupled mode；
The mixed type MMC is for being converted to direct current signal for AC signal or direct current signal being converted to AC signal；
When direct-current short circuit failure occurs, generates preset alternating-current detection signal and be transmitted to the mechanical DCCB of coupled mode.
Preferably, the mechanical DCCB of the coupled mode includes high-pressure side module and low-pressure side module；Wherein, high-pressure side module
Including mechanical switch, energy-absorbing branch and change of current branch；When short trouble occurs for the DC power transmission line, the mechanical switch
It opens, short circuit current is absorbed after flowing through change of current branch by energy-absorbing branch.
Preferably, the mixed type MMC includes DC Line Fault property identification control module；When generation direct-current short circuit failure
Afterwards, DC Line Fault property identification control module is for generating preset alternating-current detection signal.
On the other hand, it is based on direct-current short circuit property judgment method, the present invention provides a kind of direct current system reclosings
Method, comprising:
When judging short trouble for permanent fault, the control mechanical DCCB of coupled mode enters blocking, so that institute
The mechanical switch for stating the mechanical DCCB of coupled mode is not closed, and waits the maintenance of DC transmission system line fault；
When judging short trouble for transient fault, the mechanical DCCB reclosing of coupled mode is controlled, the coupling is closed
The mechanical switch of the mechanical DCCB of type.
Contemplated above technical scheme through the invention can obtain following compared with prior art
The utility model has the advantages that
The present invention proposes a kind of direct-current short circuit fault distinguishing method and DC transmission system reclosing method, by mixing
DC Line Fault property is set in the DC current controller of type MMC and recognizes control module, allows mixed type MMC in DC Line Fault
After generation and the mechanical DCCB separating brake of coupled mode, passes through switching control DC Line Fault property and recognize the preset friendship of control module generation
Stream detection signal, the coupled mechanical DCCB branch of type is injected into faulty line, by judging that the mechanical DCCB of coupled mode is defeated
The DC voltage response size of outlet, judges the property of short trouble, under the property for knowing short trouble, can keep away completely
Exempt from the mechanical DCCB reclosing of coupled mode in permanent fault, reduces flexible HVDC transmission system DCCB mechanical to coupled mode and open
The requirement of disconnected capacity, simplifies the design of the mechanical DCCB topology of coupled mode, improves flexible HVDC transmission system safety.
Detailed description of the invention
Fig. 1 is a kind of mixed type MMC topology diagram that embodiment provides；
Fig. 2 is a kind of control logic schematic diagram for mixed type MMC that embodiment provides；
Fig. 3 is a kind of structural schematic diagram for the mechanical DCCB of coupled mode that embodiment provides；
Fig. 4 is the logical circulation road that preset alternating-current detection signal is injected after the mechanical DCCB of coupled mode that embodiment provides is cut-off
Diameter；
Schematic equivalent circuit when Fig. 5 is a kind of permanent fault of embodiment offer；
Schematic equivalent circuit when Fig. 6 is a kind of transient fault of embodiment offer；
Fig. 7 is a kind of DC transmission system reclosing method based on direct-current short circuit fault distinguishing method that embodiment provides
Flow diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The thinking of technical solution of the present invention is specific as follows: after DC transmission system route goes to dissociate, passing through switching and mixes
The DC current control model of type MMC generates preset alternating-current detection signal, the change of current branch of the coupled mechanical DCCB of type
It is injected into faulty line；It is short in permanent direct-current short circuit failure and instantaneity direct current according to the preset alternating-current detection signal of injection
Different response characteristic under the failure situations of road, differentiates short trouble property, to avoid the mechanical DCCB weight of coupled mode
It closes a floodgate in permanent fault, reduces the requirement of flexible HVDC transmission system DCCB capacity mechanical for coupled mode, simplify coupling
The design of the mechanical DCCB topology of type improves the safety of flexible HVDC transmission system, reduces DC engineering construction cost.
Specifically, the present invention provides a kind of direct-current short circuit property judgment methods, comprising:
The mechanical DCCB separating brake of coupled mode after direct-current short circuit failure occurs, and mixed type MMC is generated into preset exchange
Detection signal is injected into DC power transmission line；
Detection is located at the DC voltage response of the mechanical DCCB output end of coupled mode of DC power transmission line port；
When the DC voltage response is less than preset voltage criterion, then direct-current short circuit failure is permanent fault；
Otherwise, direct-current short circuit failure is transient fault；
Wherein, the frequency of preset alternating-current detection signal accesses the DC power transmission line after short trouble according to change of current branch
Resonance frequency setting, realize that the preset alternating-current detection signal flows through the change of current branch of the mechanical DCCB of coupled mode；
Preset voltage criterion accesses short trouble according to the amplitude of preset alternating-current detection signal and the change of current branch
The parameter setting of DC power transmission line afterwards.
Preferably, preset alternating-current detection signal is generated by the DC current controller of mixed type MMC, preset when injecting
When alternating-current detection signal, the frequency of the HVDC Modulation of DC current controller than the frequency of signal and preset alternating-current detection signal
Unanimously；
The injection length of preset alternating-current detection signal is cut-off for the mechanical DCCB of coupled mode and DC transmission system route
It goes after the completion of dissociating.
More specifically, DC current controller includes DC Line Fault property identification control module；When generation direct-current short circuit event
After barrier, DC Line Fault property identification control module is for generating preset alternating-current detection signal.
More specifically, DC Line Fault property identification control mould is provided in the DC current controller of mixed type MMC
Block designs specific reference quantity by recognizing in control module instruction value in DC Line Fault property, and as DC Line Fault
The control instruction value of DC current controller after generation and the mechanical DCCB separating brake of coupled mode；The control instruction value is as preset
Alternating-current detection signal, according to the preset alternating-current detection signal of injection in permanent direct-current short circuit failure and instantaneity direct-current short circuit
Different response characteristic under failure situations, differentiates short trouble property.When being determined as permanent fault, locking coupling
The mechanical DCCB of type waits direct current transmission line fault maintenance；When being determined as transient fault, then reclosing is normally carried out.
Preferably, HVDC Modulation ratio M can be used in DC Line Fault property identification control moduledc, by presetting MdcInstruction value is
Preset alternating-current detection signal, injected pulse or alternating signal are to faulty line.
Specifically, HVDC Modulation ratio MdcPreset value can be pulsed quantity, alternating quantity etc., by injecting preset exchange detection letter
Number, branch in power grid is connected to via the mechanical DCCB of coupled mode and is connected, and is generated not according to permanent fault or transient fault
Same response.
Preferably, the amplitude of preset alternating-current detection signal should not be too large, and minimize the influence to DC transmission system,
The frequency of preset alternating-current detection signal should be set premised on the change of current branch by the mechanical DCCB of coupled mode, can basis
The resonance frequency of equivalent circuit carries out calculating determination.
Specifically, after nature of trouble anticipation criterion is by flowing into faulty line based on preset alternating-current detection signal, in wink
The difference that when property failure and permanent fault generate is responded and is extracted.The signal circulation path of permanent fault and transient fault
Different, equivalent circuit is entirely different, therefore the response generated also has different.Time domain or frequency are carried out to route transient
Domain analysis obtains the transient response difference of permanent fault and transient fault, to extract fault characteristic value, obtains permanent
Property failure distinguish criterion.
Further, AC line voltage, direct current can be used in permanent fault characteristic quantity and transient fault characteristic quantity
The response of the signals such as the DC voltage of the mechanical DCCB output end of line current, coupled mode is criterion.
Further, in order to improve the accuracy that nature of trouble recognizes, the mechanical DCCB output end of coupled mode can be used
DC voltage response be criterion, preset voltage criterion U is setline_set, straight when the mechanical DCCB output end of coupled mode
Galvanic electricity presses response to be less than preset voltage criterion Uline_setWhen, then it can determine whether that failure is permanent fault；Otherwise, then it can determine whether
Failure is transient fault.
Above-mentioned direct-current short circuit fault distinguishing method based on DC transmission system include: DC power transmission line, mixed type MMC
With the mechanical DCCB of coupled mode；
The both ends of each DC power transmission line are provided with the mechanical DCCB of coupled mode, the output of the mixed type MMC
The end connection mechanical DCCB of coupled mode；
The mixed type MMC is for being converted to direct current signal for AC signal or direct current signal being converted to AC signal；
When short trouble occurs, generates preset alternating-current detection signal and be transmitted to the mechanical DCCB of coupled mode.
Preferably, the mechanical DCCB of the coupled mode includes high-pressure side module and low-pressure side module；Wherein, high-pressure side module
Including mechanical switch, energy-absorbing branch and change of current branch；When short trouble occurs for the DC power transmission line, the mechanical switch
It opens, short circuit current is absorbed after flowing through change of current branch by energy-absorbing branch.
Preferably, the mixed type MMC includes DC Line Fault property identification control module；When generation direct-current short circuit failure
Afterwards, DC Line Fault property identification control module is for generating preset alternating-current detection signal.
Based on direct-current short circuit property judgment method, the present invention provides a kind of direct current system reclosing methods, comprising:
When judging short trouble for permanent fault, the control mechanical DCCB of coupled mode enters blocking, so that institute
The mechanical switch for stating the mechanical DCCB of coupled mode is not closed, and waits the maintenance of DC transmission system line fault；
When judging short trouble for transient fault, the mechanical DCCB reclosing of coupled mode is controlled, the coupling is closed
The mechanical switch of the mechanical DCCB of type.
When permanent fault occurs for current aerial flexible direct current power grid, may face secondary point of breaker reclosing
Lock problem proposes a kind of based on mixed type MMC preset alternating-current detection signal injection flexible HVDC transmission system reclosing side
Method.After DC Line Fault generation and the mechanical DCCB separating brake of coupled mode, the DC current control model of switching mixed type MMC is generated
Preset alternating-current detection signal, the coupled mechanical DCCB branch of type are injected into faulty line；According to Injection Signal permanent
Different response characteristics, differentiates short trouble property under direct-current short circuit failure and instantaneity direct-current short circuit failure situations,
To avoid the mechanical DCCB reclosing of coupled mode in permanent fault, it is mechanical to coupled mode to reduce flexible HVDC transmission system
The requirement of DCCB Breaking capacity simplifies the design of the mechanical DCCB topology of coupled mode, improves flexible HVDC transmission system safety,
Reduce DC engineering construction cost.
Embodiment
The physical significance of each primary variables or abbreviation that embodiment is related to is listed in the table below in 1:
Table 1
Fig. 1 is a kind of mixed type MMC topology that embodiment uses, each of which bridge arm is by 50% bridge-type submodule
(FBSM) it is connected in series with 50% semi-bridge type submodule (HBSM), for bridge-type submodule, operating mode is as shown in table 2,
It is characterized in that negative voltage can be exported, inverter can be made to run in negative pressure, wherein T1-T4 respectively indicates each bridge-type submodule
Four IGBT, U of blocksmIndicate the voltage of submodule output, UCIndicate submodule capacitor voltage, control involved in the present embodiment
For system suitable for each known, the MMC that can stablize output negative voltage is topological.
Table 2
Fig. 2 is the control logic schematic diagram of mixed type MMC, includes DC Line Fault in DC current controller as can be seen from Figure 2
Property recognizes control module, and after DC transmission system route goes to dissociate, starting DC Line Fault property recognizes control module, will be straight
Flow modulation ratio signal MdcInput terminal switch to preset value, so that generating preset alternating-current detection signal is injected into DC Line Fault line
Road carries out nature of trouble anticipation, which uses alternating signal, and former HVDC Modulation is than the alternating-current detection signal that signal is predetermined
Replace, preset alternating-current detection signal amplitude is chosen for 1pu~1.1pu in the present embodiment, and frequency is to pass through coupled mode machinery
It is set premised on formula DCCB change of current branch, calculating determination is carried out according to the resonance frequency of equivalent circuit.
Fig. 3 is a kind of structural schematic diagram for the mechanical DCCB of coupled mode that embodiment provides.The mechanical DCCB packet of coupled mode
Include high-pressure side module and low-pressure side module, high-pressure side module is made of mechanical switch, change of current branch and energy-absorbing branch, manufacture at
This and running wastage are relatively low；Mechanical switch is closed when operating normally, and after DC Line Fault generation, mechanical switch quickly divides
Lock, fault current flow through change of current branch and energy-absorbing branch.
Fig. 4 is the change of current Zhi Luxiang event that converter station passes through the mechanical DCCB of coupled mode after the mechanical DCCB of coupled mode is disconnected
Barrier point injects the guiding path of preset alternating-current detection signal；Change of current branch is since the devices such as inductance or capacitor exist, with direct current
Network still has electrical connection, and the preset alternating-current detection signal that inverter issues flows into faulty line by change of current branch.
The equivalent circuit that Fig. 5 is DC Line Fault when being permanent fault, inverter are equivalent to DC voltage source DC Line Fault
Property recognizes the superposition of control module, and the change of current branch of the mechanical DCCB of coupled mode constitutes inductor-capacitor access.Wherein, coupling
Inductance on the right side of the mechanical DCCB access of mould assembly is current-limiting reactor, and by calculating the resonance frequency of equivalent circuit, it is suitable to choose
MdcAs preset alternating-current detection signal, the AC line voltage response quautity for being easy detection can produce.
The equivalent circuit that Fig. 6 is DC Line Fault when being transient fault, after transient fault is removed, both ends mixed type MMC
It is connected with direct current transportation overhead line by the mechanical DCCB change of current branch of coupled mode at both ends, constitutes complete loops.
Fig. 7 is a kind of DC transmission system reclosing method based on direct-current short circuit fault distinguishing method that embodiment provides
Flow chart, comprising the following steps:
(1) direct-current short circuit fault-signal, the mechanical DCCB separating brake of coupled mode are detected；
(2) the DC current control model for switching mixed type MMC injects preset exchange detection letter to DC transmission system
Number；
(3) the response characteristic amount for extracting preset alternating-current detection signal, judges whether it meets permanent fault criterion, into
The anticipation of row nature of trouble；
To reduce the extraction difficulty of detection signal, while increasing the detection sensitivity of nature of trouble criterion, using coupled mode
The DC voltage response of mechanical DCCB output end is criterion, and preset voltage criterion U is arrangedline_set, when coupled mode machinery
The DC voltage response of formula DCCB output end is less than preset voltage criterion Uline_setWhen, then it can determine whether that failure is permanent event
Barrier；Otherwise, then it can determine whether that failure is transient fault；
(4) reclosing action director recognizes criterion, when being determined as permanent fault, coupled mode machine based on nature of trouble
Tool formula DCCB enters blocking, waits the maintenance of DC transmission system line fault；When being determined as transient fault, then couple
The mechanical DCCB of type carries out rapidly reclosing.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of direct-current short circuit property judgment method characterized by comprising
The mechanical DCCB separating brake of coupled mode after direct-current short circuit failure occurs, and the default exchange that mixed type MMC is generated detects
Signal is injected into DC power transmission line；
Detection is located at the DC voltage response of the mechanical DCCB output end of coupled mode of DC power transmission line port；
When the DC voltage response is less than preset voltage criterion, then direct-current short circuit failure is permanent fault；Otherwise,
The direct-current short circuit failure is transient fault；
Wherein, the frequency of the preset alternating-current detection signal accesses the DC power transmission line after short trouble according to change of current branch
Resonance frequency setting；
The preset voltage criterion accesses short circuit according to the amplitude of the preset alternating-current detection signal and the change of current branch
The parameter setting of DC power transmission line after failure.
2. direct-current short circuit property judgment method according to claim 1, which is characterized in that the preset exchange inspection
Signal is surveyed to be generated by the DC current controller of mixed type MMC, when injecting preset alternating-current detection signal, DC current control
The HVDC Modulation of device is more consistent with the frequency of preset alternating-current detection signal than the frequency of signal；
The injection length of preset alternating-current detection signal is that the mechanical DCCB of coupled mode is cut-off and DC transmission system route goes to swim
From after the completion.
3. direct-current short circuit property judgment method according to claim 2, which is characterized in that the injection preset friendship
When stream detection signal, the HVDC Modulation is 1pu~1.1pu than the amplitude of signal.
4. direct-current short circuit fault distinguishing method according to claim 2 or 3, which is characterized in that the DC transmission system
Including DC power transmission line, mixed type MMC and the mechanical DCCB of coupled mode；
The output end that the both ends of each DC power transmission line are provided with coupled mode a mechanical DCCB, the mixed type MMC connects
Meet the mechanical DCCB of coupled mode；
The mixed type MMC is for being converted to direct current signal for AC signal or direct current signal being converted to AC signal；It is sending out
When raw direct-current short circuit failure, generates preset alternating-current detection signal and be transmitted to the mechanical DCCB of coupled mode.
5. direct-current short circuit property judgment method according to claim 4, which is characterized in that the coupled mode is mechanical
DCCB includes high-pressure side module and low-pressure side module；Wherein, high-pressure side module includes mechanical switch, energy-absorbing branch and change of current branch
Road；When short trouble occurs for the DC power transmission line, the mechanical switch is opened, and short circuit current flows through quilt after change of current branch
Energy-absorbing branch absorbs.
6. direct-current short circuit fault distinguishing method according to any one of claims 1 to 5, which is characterized in that the mixed type MMC
Control module is recognized including DC Line Fault property；After direct-current short circuit failure occurs, DC Line Fault property recognizes control module and uses
In the preset alternating-current detection signal of generation.
7. the direct current system reclosing method based on direct-current short circuit fault distinguishing method described in claim 1, comprising:
When judging short trouble for permanent fault, the mechanical switch of the mechanical DCCB of coupled mode is not closed, and is waited straight
Flow transmission system line trouble hunting；
When judging short trouble for transient fault, it is closed the mechanical switch of the mechanical DCCB of the coupled mode.
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| CN111142044A (en) * | 2020-02-05 | 2020-05-12 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN113315101A (en) * | 2021-05-28 | 2021-08-27 | 国网冀北综合能源服务有限公司 | Short-circuit fault recovery device and method |
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| CN110095688A (en) * | 2019-05-08 | 2019-08-06 | 国网河南省电力公司电力科学研究院 | LCC-MMC mixes three end DC transmission system fault detection methods and device |
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| CN111142044B (en) * | 2020-02-05 | 2022-03-18 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN113315101A (en) * | 2021-05-28 | 2021-08-27 | 国网冀北综合能源服务有限公司 | Short-circuit fault recovery device and method |
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Application publication date: 20191115 |