CN107359605A - A kind of suppression module multilevel converter DC side fault overcurrent method - Google Patents
A kind of suppression module multilevel converter DC side fault overcurrent method Download PDFInfo
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- CN107359605A CN107359605A CN201710817720.0A CN201710817720A CN107359605A CN 107359605 A CN107359605 A CN 107359605A CN 201710817720 A CN201710817720 A CN 201710817720A CN 107359605 A CN107359605 A CN 107359605A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a kind of suppression module multilevel converter DC side fault overcurrent method, it is characterized in, comprises the step of：Using the MMC topologys of bridge arm reactor coupling, bridge arm reactor coupling principle is illustrated；The system dc side fault overcurrent is analyzed；Then the optimal coefficient of coup is chosen.And the validity of this method by simulating, verifying.After failure generation, the MMC fault loop reactance values based on the coupling of bridge arm reactor are larger, hinder fault current growth, gained time for protection act, run systematic steady state.With the advantages that scientific and reasonable, strong applicability, effect is good.
Description
Technical field
The present invention relates to a kind of suppression module multilevel converter (MMC) DC side fault overcurrent method, belong to soft
Property direct current transportation field.
Background technology
Modularization multi-level converter D.C. high voltage transmission (MMC-HVDC) is used as a kind of New Technologies of Electric Power Transmission, using half-bridge
The form of sub-module cascade, there is many advantages, such as degree of modularity is high, harmonic distortion is small, switching loss is low, expansion is good, by
Gradually turn into the high, important component of medium voltage DC Force system.
Modularization multi-level converter D.C. high voltage transmission (MMC-HVDC) system dc side short trouble causes current conversion station
The serious overcurrent of bridge arm, causes power electronic devices to be damaged, and threatens the safe operation of system.Current safeguard measure be
Locking current conversion station after Millisecond delay, then disconnect AC circuit breaker.But before locking, fault current has reached very high number
Value.Existing method blocks fault current, such as full-bridge submodule topology, clamp Shuangzi mould using new MMC topological structures more
Block topology etc..MMC based on full-bridge submodule is most strong to DC side fault current blocking ability, and control technology is simply ripe, but
Device is excessive, substantially increases loss and the input cost of transverter.Shuangzi module is clamped compared with full-bridge submodule, it is required
Number of devices has been reduced, but certain coupling is presented in its structure, adds control and the complexity pressed.And based on void
The overcurrent for intending impedance suppresses strategy, by the way that actual circuit element characteristic is mapped into control system to suppress fault overcurrent,
Inhibition is not notable.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming prior art, there is provided a kind of scientific and reasonable, strong applicability, the good suppression of effect
Modularization multi-level converter DC side fault overcurrent method processed, can be by being sent out based on the MMC that bridge arm reactor couples
Larger bridge arm reactance suppresses the overcurrent before current conversion station locking during raw DC side failure.
Realizing the technical scheme that foregoing invention purpose uses is：A kind of suppression module multilevel converter DC side failure
Overcurrent method, it is characterized in that, it comprises the following steps：
(1) it will be coupled with mutually upper and lower two bridge arm reactance, and establish the MMC topologys of bridge arm reactor coupling：Mutual reactor
Using coaxial and by the way of so that higher coefficient of coup k between two coils be present, the number of turn of two coils is identical, around to phase
Together, heteropleural is connected in parallel in MMC, and in system normal operation, the actual fundamental current on two coils is flowed on the contrary, its electric current
The mutual degaussing in magnetic field is produced, bridge arm inductance is appropriate bridge arm reactance value, does not influence the steady-state operation of system；Occur in system double
During the short trouble of pole, each facies unit forms loop with grounding resistance, and submodule electric capacity discharges rapidly, and alternating short-circuit current influences very
Small, upper and lower two bridge arm current variation tendencies are close, the mutual excitation in magnetic field caused by its electric current, and now bridge arm inductance is very big
Reactance value, hinder short circuit current rise；
(2) the bipolar short trouble overcurrent of analysis system DC side：After bipolar short trouble occurs for dc bus, system shape
State is divided into before current conversion station locking and latter two stage of locking, and before current conversion station locking, bridge arm current is alternating short-circuit current and submodule
The superposition of block capacitance discharge current, and electric capacity electric discharge is the main reason for causing overcurrent, submodule electric capacity is put by IGBT1
Electricity, can be equivalent into a Second-Order RLC Filter Circuit discharge circuit, wherein, RLAnd LLFor line impedance, L0For bridge arm reactance self-induction, M is bridge arm
Reactance mutual inductance, C are submodule electric capacity, RfFor short-circuit resistance, if instant of failure DC line electric current is I0, capacitance voltage U0, then
After failure, fault loop all-in resistance R=RL+Rf, fault loop total inductance L=2L0+2M+LL, the calculation formula of fault current isWherein, attenuation coefficientUndamped oscillation frequencyDamped oscillation
FrequencyMake fault current initial phase angleFault current peak valueThen failure
The calculation formula of electric current can be written asAs can be seen that fault loop total inductance L is bigger, ω is smaller, electric current
The concussion cycle is bigger, and the speed that electric current reaches peak value is slower, and the time is got for protection act；Meanwhile L is bigger, fault current
Peak IpeakIt is smaller, reduce bridge arm over-current level；Fault loop total inductance L=2 (1-k) L0+4kL0+LL, and (1-k) L0To be
Bridge arm reactance during system steady-state operation, is the steady-state operation for not influenceing system, keeps the value constant, by suitably increasing 4kL0
To increase L so that fault overcurrent reduces；
(3) selection of the coefficient of coup：Keep L-M constant, i.e., bridge arm inductance value is constant when systematic steady state is run, and changes coupling
Coefficient k, as coefficient of coup k increases, bridge arm current reduces, and when coefficient of coup k values are excessive, self-induction, mutual inductance can reach very big
Numerical value so that physical device is excessive or can not meet, and excessive coefficient of coup k values cause submodule capacitor voltage fluctuation compared with
Greatly, system reach stable state time it is longer, need to consider choose coefficient of coup k values.
The present invention proposes a kind of suppression module multilevel converter DC side fault overcurrent method, double direct current occurs
It is very big using bridge arm coupling reactance value after the short trouble of pole, fault current growth is hindered, suppresses excessively electric before current conversion station locking
Stream, gains time for protection act.With methodological science, strong applicability, the advantages that effect is good.
Brief description of the drawings
Fig. 1 is the MMC topological diagrams using the coupling of bridge arm reactor；
Fig. 2 is axial plane figure in upper and lower bridge arm coupling reactance；
Fig. 3 is the single-phase decoupling equivalent circuit diagram of submodule electric capacity electric discharge；
Fig. 4 is the relation schematic diagram of self-induction of loop, mutual inductance and the coefficient of coup；
Fig. 5 is the bridge arm average peak current curve synoptic diagram after failure 5ms；
Fig. 6 is the bridge arm transient current profile schematic diagram in A phases after failure 5ms.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Referring to accompanying drawing 1-6, a kind of suppression module multilevel converter DC side fault overcurrent side proposed by the present invention
Method, specific implementation step are as follows：
It referring to Fig. 1, will be coupled with mutually upper and lower two bridge arm reactance, and establish the MMC topologys of bridge arm reactor coupling.In figure
usi、isi(i=a, b, c) represents each phase voltage of transverter AC, electric current, U respectivelydc、IdcConverter DC-side electricity is represented respectively
Pressure, electric current.Transverter has three facies units, and the upper and lower bridge arm of each facies unit is L by n submodule and self-induction0Bridge arm
Reactance is in series.Coupling, mutual inductance M be present with mutually upper and lower two bridge arm reactance, and be heteropleural parallel connection.
Referring to Fig. 2,1-2,3-4 are 2 encapsulating coils of mutual reactor.The number of turn of two coils is identical, around to identical,
Self-induction is L0.Mutual reactor is using coaxially and by the way of so that higher coefficient of coup k between two coils be present.Each
In facies unit, mutual reactor 1,4 ends are connected with n-th, n+1 submodule respectively, and 2,3 ends interconnect and draw output end company
AC is connected to, i.e. MMC is flowed into from 1,3 ports, flowed out from 2,4 ports respectively with mutually upper and lower two bridge arm currents.In system just
Often during operation, the actual fundamental current on two coils is flowed on the contrary, the mutual degaussing of its current induced magnetic field, bridge arm inductance (1-
k)L0For appropriate bridge arm reactance value, the steady-state operation of system is not influenceed；When bipolar short trouble occurs for system, each facies unit
Loop is formed with grounding resistance, submodule electric capacity discharges rapidly, and alternating short-circuit current influences very little, upper and lower two bridge arm currents
Variation tendency is close, the mutual excitation in magnetic field caused by its electric current, and now bridge arm inductance becomes (1+k) L0, it is very big reactance value,
Short circuit current is hindered to rise.
(2) the bipolar short trouble overcurrent of analysis system DC side.After bipolar short trouble occurs for dc bus, system shape
State is divided into before current conversion station locking and latter two stage of locking.Before current conversion station locking, bridge arm current is alternating short-circuit current and submodule
The superposition of block capacitance discharge current, and electric capacity electric discharge is the main reason for causing overcurrent.Submodule electric capacity is put by IGBT1
Electricity, can be equivalent into a Second-Order RLC Filter Circuit discharge circuit, referring to Fig. 3.Wherein, RLAnd LLFor line impedance, L0For bridge arm reactance self-induction,
M is bridge arm reactance mutual inductance, and C is submodule electric capacity, RfFor short-circuit resistance.If instant of failure DC line electric current is I0, capacitance voltage
For U0, then after failure, fault loop all-in resistance R=RL+Rf, fault loop total inductance L=2L0+2M+LL, the calculating of fault current
Formula isWherein attenuation coefficientUndamped oscillation frequencyDecay
Frequency of oscillationMake fault current initial phase angleFault current peak value
Then the calculation formula of fault current can be written asAs can be seen that fault loop total inductance L is bigger, ω is got over
Small, the current oscillation cycle is bigger, and the speed that electric current reaches peak value is slower, and the time is got for protection act；Meanwhile L is bigger, therefore
Hinder current peak IpeakIt is smaller, reduce bridge arm over-current level.Fault loop total inductance can be write as L=2 (1-k) L0+4kL0+LL,
And (1-k) L0Bridge arm reactance when being run for systematic steady state, it is the steady-state operation for not influenceing system, keeps the value constant, pass through
Appropriate increase 4kL0Increase L so that fault overcurrent reduces.
(3) coefficient of coup is chosen.Keep L-M constant, i.e., bridge arm inductance value is constant when systematic steady state is run, and changes coupled systemes
Number k, as coefficient of coup k increases, bridge arm current reduces.Referring to Fig. 4, when coefficient of coup k values are excessive, self-induction, mutual inductance can reach
Very big numerical value so that physical device is excessive or can not meet, and excessive coefficient of coup k values cause submodule capacitor voltage
Fluctuate larger, system reach stable state time it is longer, need to consider choose k values.
Simulation analysis
Example：
Both-end MMC-HVDC systems are built in MATLAB, its detail parameters is as shown in table 1.System controlling cycle is
100 μ s, rectification side determine Reactive Power Control using DC voltage cooperation is determined, and inverter side coordinates fixed idle work(using active power is determined
Rate controls.After MMC-HVDC systematic steady states operation 3.0s, permanent bipolar short trouble is set in rectification side direct current exit, therefore
Barrier resistance is 0.01 Ω.In t=3.005s, i.e. failure implements locking after 5ms occurs.
The level MMC-HVDC system major parameters of table 1 31
Bridge arm average peak current iarmmaxThe average maximum current level of six bridge arms, table can be represented to a certain extent
It is shown as：Wherein IdcFor DC current, isd、isqRespectively d, q shaft current, failure side current conversion station bridge
Arm average peak current is referring to Fig. 5.Using bridge arm average peak current during ordinary reactors t=3.000~3.002s,
Increase in current rate is respectively 3.232kA/ms, 3.076kA/ms in 3.002~3.005s, and short-time current increases after failure occurs
Rapidly, locking moment current value is very big, and this, which does not require nothing more than electronic device, very strong tolerance, it is also necessary to which locking is moved
Make rapid；And bridge arm average peak current during mutual reactor is used in t=3.000~3.002s, 3.002~3.005s
Increase in current rate is respectively 0.850kA/ms, 1.143kA/ms, and increase in current is slow, it is seen that is coupled and suppressed using bridge arm reactor
Fault current significant effect.
Each bridge arm transient current variation tendency is close during failure, by taking bridge arm transient current in the current conversion station A phases of failure side as an example,
Referring to Fig. 6.The system power size of mutual reactor is used in t=3.005s as 7.56kA, is only to use ordinary reactors
System power size 16.72kA 45.22%, it is seen that using the MMC bridge arms fault current ratio of mutual reactor using common
Obvious reduction during reactor.Averagely choose 9 time points in t=3~3.02s sets bipolar short trouble respectively, records
Size of each bridge arm current after 5ms occurs for failure, is summarized in table 2, table 3.It can be seen that by the data comparison of table 2 and table 3
Fault current can obviously reduce using mutual reactor；Different faults moment bridge arm average peak current value fluctuates very little, reflection
Bridge arm average peak current above compares the validity for the different faults moment.
2 each bridge arm of table current instantaneous value (common bridge arm reactor) after failure 5ms
3 each bridge arm of table current instantaneous value (coupling bridge arm reactor) after failure 5ms
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (1)
1. a kind of suppression module multilevel converter DC side fault overcurrent method, it is characterized in that, it comprises the following steps：
(1) it will be coupled with mutually upper and lower two bridge arm reactance, and establish the MMC topologys of bridge arm reactor coupling：Mutual reactor uses
It is coaxial and around mode so that higher coefficient of coup k between two coils be present, the number of turn of two coils is identical, different around to identical
Side is connected in parallel in MMC, and in system normal operation, the actual fundamental current flow direction on two coils is on the contrary, its electric current produces
The mutual degaussing in magnetic field, bridge arm inductance are appropriate bridge arm reactance value, do not influence the steady-state operation of system；Occur in system bipolar short
During the failure of road, each facies unit forms loop with grounding resistance, and submodule electric capacity discharges rapidly, and alternating short-circuit current influences very little,
Upper and lower two bridge arm current variation tendencies are close, the mutual excitation in magnetic field caused by its electric current, and now bridge arm inductance is very big electricity
Anti- value, short circuit current is hindered to rise；
(2) the bipolar short trouble overcurrent of analysis system DC side：After bipolar short trouble occurs for dc bus, system mode point
For before current conversion station locking and latter two stage of locking, before current conversion station locking, bridge arm current is alternating short-circuit current and submodule electricity
The superposition of discharge capacitor electric current, and electric capacity electric discharge is the main reason for causing overcurrent, submodule electric capacity is discharged by IGBT1, can
It is equivalent into a Second-Order RLC Filter Circuit discharge circuit, wherein, RLAnd LLFor line impedance；L0For bridge arm reactance self-induction；M is that bridge arm reactance is mutual
Sense；C is submodule electric capacity；RfFor short-circuit resistance, if instant of failure DC line electric current is I0, capacitance voltage U0, then failure
Afterwards, fault loop all-in resistance R=RL+Rf, fault loop total inductance L=2L0+2M+LL, the calculation formula of fault current isWherein, attenuation coefficientUndamped oscillation frequencyDamped oscillation
FrequencyMake fault current initial phase angleFault current peak valueThen failure
The calculation formula of electric current can be written as i=e-δt[IpeakSin (ω t+ γ)], it can be seen that fault loop total inductance L is bigger, and ω is got over
Small, the current oscillation cycle is bigger, and the speed that electric current reaches peak value is slower, and the time is got for protection act；Meanwhile L is bigger, therefore
Hinder current peak IpeakIt is smaller, reduce bridge arm over-current level；Fault loop total inductance L=2 (1-k) L0+4kL0+LL, and (1-
k)L0Bridge arm reactance when being run for systematic steady state, it is the steady-state operation for not influenceing system, keeps the value constant, by suitably increasing
Big 4kL0Increase L so that fault overcurrent reduces；
(3) selection of the coefficient of coup：Keep L-M constant, i.e., bridge arm inductance value is constant when systematic steady state is run, and changes the coefficient of coup
K, as coefficient of coup k increases, bridge arm current reduces, and when coefficient of coup k values are excessive, self-induction, mutual inductance can reach very big numerical value,
So that physical device is excessive or can not meet, and excessive coefficient of coup k values cause that submodule capacitor voltage fluctuation is larger, is
The time that system reaches stable state is longer, need to consider and choose coefficient of coup k values.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400701A (en) * | 2018-04-24 | 2018-08-14 | 国网冀北电力有限公司电力科学研究院 | A kind of flexible direct current power transmission system |
| CN108494261A (en) * | 2018-04-13 | 2018-09-04 | 东南大学 | A kind of active current-limiting method suitable for MMC type commutator transformer DC Line Fault |
| CN108829989A (en) * | 2018-06-22 | 2018-11-16 | 国网江苏电力设计咨询有限公司 | Flexible direct current system direct current side major loop parameter design method containing superconducting direct current limiter |
| CN109100615A (en) * | 2018-10-19 | 2018-12-28 | 河海大学 | A kind of cable fault localization method based on frequency characteristic |
| CN109787205A (en) * | 2019-02-26 | 2019-05-21 | 东北电力大学 | Converter DC-side fault current suppressing method based on additional virtual inductance coefficent |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050955A (en) * | 2012-12-07 | 2013-04-17 | 国网智能电网研究院 | Over-voltage protection method for modularized multi-level voltage source commutation valve |
| CN104901524A (en) * | 2015-05-26 | 2015-09-09 | 清华大学 | DC bipolar short-circuit fault crossing method for modular multilevel converter |
| WO2016056072A1 (en) * | 2014-10-08 | 2016-04-14 | 三菱電機株式会社 | Power conversion device |
| WO2016180599A1 (en) * | 2015-05-11 | 2016-11-17 | Schneider Toshiba Inverter Europe Sas | Multi-level medium-voltage power converter device having an ac output |
| CN106407494A (en) * | 2016-03-25 | 2017-02-15 | 华北电力大学 | Bipolar short circuit fault current calculation method of MMC-based HVDC system |
| CN106787823A (en) * | 2017-01-10 | 2017-05-31 | 清华大学 | A kind of modularization multi-level converter of the bridge arm reactance with mutual inductance |
| CN107069795A (en) * | 2017-04-27 | 2017-08-18 | 国家电网公司 | A kind of bipolar short-circuit current computational methods of multiterminal MMC HVDC |
-
2017
- 2017-09-12 CN CN201710817720.0A patent/CN107359605A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050955A (en) * | 2012-12-07 | 2013-04-17 | 国网智能电网研究院 | Over-voltage protection method for modularized multi-level voltage source commutation valve |
| WO2016056072A1 (en) * | 2014-10-08 | 2016-04-14 | 三菱電機株式会社 | Power conversion device |
| WO2016180599A1 (en) * | 2015-05-11 | 2016-11-17 | Schneider Toshiba Inverter Europe Sas | Multi-level medium-voltage power converter device having an ac output |
| CN104901524A (en) * | 2015-05-26 | 2015-09-09 | 清华大学 | DC bipolar short-circuit fault crossing method for modular multilevel converter |
| CN106407494A (en) * | 2016-03-25 | 2017-02-15 | 华北电力大学 | Bipolar short circuit fault current calculation method of MMC-based HVDC system |
| CN106787823A (en) * | 2017-01-10 | 2017-05-31 | 清华大学 | A kind of modularization multi-level converter of the bridge arm reactance with mutual inductance |
| CN107069795A (en) * | 2017-04-27 | 2017-08-18 | 国家电网公司 | A kind of bipolar short-circuit current computational methods of multiterminal MMC HVDC |
Cited By (18)
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|---|---|---|---|---|
| CN108494261A (en) * | 2018-04-13 | 2018-09-04 | 东南大学 | A kind of active current-limiting method suitable for MMC type commutator transformer DC Line Fault |
| CN108400701A (en) * | 2018-04-24 | 2018-08-14 | 国网冀北电力有限公司电力科学研究院 | A kind of flexible direct current power transmission system |
| CN108829989B (en) * | 2018-06-22 | 2022-04-01 | 国网江苏电力设计咨询有限公司 | Method for designing parameters of main loop on direct current side of flexible direct current system containing superconducting direct current limiter |
| CN108829989A (en) * | 2018-06-22 | 2018-11-16 | 国网江苏电力设计咨询有限公司 | Flexible direct current system direct current side major loop parameter design method containing superconducting direct current limiter |
| CN109100615A (en) * | 2018-10-19 | 2018-12-28 | 河海大学 | A kind of cable fault localization method based on frequency characteristic |
| CN109100615B (en) * | 2018-10-19 | 2019-11-26 | 河海大学 | A kind of cable fault localization method based on frequency characteristic |
| CN109787205A (en) * | 2019-02-26 | 2019-05-21 | 东北电力大学 | Converter DC-side fault current suppressing method based on additional virtual inductance coefficent |
| CN109800381A (en) * | 2019-03-22 | 2019-05-24 | 清华大学 | The direct-current short circuit current calculation method and system of modularization multi-level converter |
| CN110501919A (en) * | 2019-08-26 | 2019-11-26 | 哈尔滨工业大学 | Modularization multi-level converter number physical mixed emulation interface design method |
| CN110501919B (en) * | 2019-08-26 | 2022-05-03 | 哈尔滨工业大学 | Design method of digital physical hybrid simulation interface of modular multilevel converter |
| CN111009882A (en) * | 2019-12-31 | 2020-04-14 | 全球能源互联网研究院有限公司 | Failure protection control method and system based on MMC solid state redundancy device |
| CN111009882B (en) * | 2019-12-31 | 2021-10-15 | 全球能源互联网研究院有限公司 | Failure protection control method and system based on MMC solid state redundancy device |
| CN111799751A (en) * | 2020-06-10 | 2020-10-20 | 国网江苏省电力有限公司南京供电分公司 | Flexible controller direct current unit fault current calculation method and system |
| CN111799751B (en) * | 2020-06-10 | 2022-10-04 | 国网江苏省电力有限公司南京供电分公司 | Flexible controller direct current unit fault current calculation method and system |
| CN111624392A (en) * | 2020-07-20 | 2020-09-04 | 平顶山学院 | Method, device and equipment for detecting fundamental wave current of single-phase circuit |
| CN111624392B (en) * | 2020-07-20 | 2022-11-22 | 平顶山学院 | Method, device and equipment for detecting fundamental wave current of single-phase circuit |
| CN114024294A (en) * | 2021-10-22 | 2022-02-08 | 武汉大学 | Virtual-entity integrated current limiting system and method suitable for half-bridge type MMC |
| CN114024294B (en) * | 2021-10-22 | 2023-08-15 | 武汉大学 | Virtual-physical integrated current limiting system and method suitable for half-bridge MMC |
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