CN108233401A - Flexible direct-current transmission converter power regulating method - Google Patents
Flexible direct-current transmission converter power regulating method Download PDFInfo
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- CN108233401A CN108233401A CN201711474354.XA CN201711474354A CN108233401A CN 108233401 A CN108233401 A CN 108233401A CN 201711474354 A CN201711474354 A CN 201711474354A CN 108233401 A CN108233401 A CN 108233401A
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Classifications
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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
-
- 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
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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 flexible direct-current transmission converter power regulating methods, belong to Power System Flexible technical field of direct current power transmission.The strategy includes control analysis converter power mathematical model and control mode；Find that transverter is active and reactive power decouples PI control modes according to analysis model and control mode；Positive-negative sequence compensation electric current is effectively worth to according to control PI values limitation power output and alternating voltage deviation.Solves the low-voltage crossing ability crossed flow problem and enhance MMC transverters when symmetrically or non-symmetrically failure occurs for system net side by the present invention.Overcurrent is effectively inhibited when can be to failure, while enhances the low-voltage crossing ability of transverter, and can be effectively applied to different occasions.
Description
Technical field
The present invention relates to Power System Flexible technical field of direct current power transmission, more particularly to a kind of flexible direct-current transmission converter
Power regulating method, em ergency power support control strategy when being MMC flexible direct-current transmission system net side failure.
Background technology
With the rapid growth of China's economy, the demand to the energy further improves.At present, China oneself through foring with fire
Based on electricity and water power, wind energy, the energy resource supply pattern of the new and renewable energies development in an all-round way such as solar energy.It is same with this
When, Chinese large-sized coal electricity and wind power base are mainly distributed on western and northwestern, Hydropower Base and concentrate on southwest, send out
Electric base apart from load center farther out.It sends outside for realization electric power and distributes rationally on a large scale on a large scale, it is necessary to develop effective energy
Source mode of movement, based on modularization multi-level converter MMC-HVDC (Modular Multilevel Converter Based
On HVDC, MMC-HVDC) flexible direct current power transmission system come into being.
Modularization multi-level converter is that the side that Conventional switch devices are directly connected is substituted by way of sub-module cascade
Formula, by feat of its modularization, can automatic shutoff, low harmonic content, switching frequency it is low and the advantages that loss, voltage class are easily expanded
It receives significant attention, as other transverters, while it can realize that active power and reactive power individually control, in its energy
In the range of force curve, MMC can adjust AC system voltage, it can be achieved that static var compensation by changing the reactive power of output
Repay function.According to its technological merit, flexible DC transmission technology is suitable for that wind field is grid-connected, the asynchronous interconnection of AC system, isolated island supply
The fields such as electricity, distributed power generation is grid-connected, multi-terminal HVDC transmission and the transformation of urban power distribution network underground, therefore the modular multilevel change of current
The application of device high voltage dc transmission technology increasingly attracts attention.
In order to maintain ac bus voltage stabilization, a kind of method is above-mentioned said harmonic carcellation component, another method
Exactly control power output.At present, it is had been supplied in MMC control systems by dq decoupling control harmonic carcellation components methods,
In the case of no any control mode, when system exchange side breaks down, since inner and outer ring speed control is too slow, hold very much
The system of easily causing crosses overvoltage problem after flow problem and light current net fault clearance, therefore, how to control when AC fault occurs
MMC converter powers output processed is the key that solve the problems, such as.In addition, electric grid operating personnel need the change of current of each connection power grid
Device all has low-voltage crossing ability, this has higher requirement to MMC transverter Reactive Power Controls.
Invention content
The purpose of the present invention is to provide a kind of flexible direct-current transmission converter power regulating methods, solve the prior art
The low-voltage crossing ability crossed flow problem and enhance MMC transverters during the existing exchange side system failure.By limiting power
PI parameters inhibit overcurrent problem, while the generation of alternating voltage deviation virtual value is taken to support current reference value Δ iref, when three
Generation only controls forward-order current during with respect to earth faultIt is generated when single-phase fault to groundOnly control negative-sequence current, with
Promote transverter low-voltage crossing ability.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
Flexible direct-current transmission converter power regulating method, is as follows：
Step 1：Modular multi-level flexible direct-current transmission system model is simplified, to test the adjustment side
Method；
Step 2：Establish system model power mathematical model；
Step 3：Determine system master method；
Step 4：Inhibit method for controlling overcurrent when determining to break down；
Step 5：It determines that MMC is idle and supports control.
The simplified model of modular multi-level flexible direct-current transmission system described in step 1, wherein MMC1 and MMC2 are mould
Block multilevel converter, both sides AC system are equivalent to alternating-current voltage source and AC impedance by Dai Weinan, will by transformer
AC power is connected with MMC, and DC side is directly connected to back-to-back by cable.
System model power mathematical model is established described in step 2, determines to be transported to the active of MMC current conversion stations from AC system
With acrobatic skill power mathematic(al) representation.
Determine that the main control mode of system uses vector controlled described in step 3；DC voltage is determined to MMC1 uses and determines nothing
Work(power control, MMC2 uses determine active power and determine Reactive Power Control；Control system uses positive sequence and negative phase-sequence control strategy.
Inhibit method for controlling overcurrent when determining to break down described in step 4,2 net side does three-phase shortcircuit ground connection event in port
Barrier, Converter Station Valve side power quality when analyzing failure according to steady state power expression formula, by limiting exterior ring power PI values, inhibit
Overcurrent during failure.
The idle methods controlled of supporting of MMC are determined described in step 5 is：Reactive power can be provided when AC fault to prop up
Support alternating voltage；Further improve MMC performances, transverter net side busbar voltage when detecting failure, when alternating voltage is sagging into
Support that row is idle.
The beneficial effects of the present invention are：The output of power outer shroud PI values is limited, while inner ring positive-negative sequence current dq is decoupled
Control strategy when symmetrical and asymmetrical alternating current failure occurs for system, is controlled according to voltage on line side deviation, and correspondence is provided separately just
Sequence and negative phase-sequence reactive current are supported.This strategy is with obvious effects to the reactive current of alternating voltage is supported to support.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the application, this hair
Bright illustrative example and its explanation do not constitute improper limitations of the present invention for explaining the present invention.
Fig. 1 is MMC-HVDC simplified models；
Fig. 2 is Baseline Control Strategy；
Voltage, current waveform when Fig. 3 is three-phase ground failure；
Current waveform after Fig. 4 is plus controls；
Fig. 5 is voltage deviation control principle drawing；
Fig. 6 is voltage deviation control flow chart；
Fig. 7 is to add voltage, current waveform after positive sequence control；
Changed power when Fig. 8 is three-phase fault；
Fig. 9 is negative-sequence current control strategy；
Figure 10 is to add voltage, current waveform after negative phase-sequence control；
Figure 11 is idPositive- and negative-sequence currents.
Specific embodiment
The detailed content and its specific embodiment further illustrated the present invention below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Figure 10, flexible direct-current transmission converter power regulating method of the invention, the strategy includes control
System analysis converter power mathematical model and control mode；Find that transverter is active and idle according to analysis model and control mode
Power decoupled PI control modes；Positive-negative sequence compensation is effectively worth to according to control PI values limitation power output and alternating voltage deviation
Electric current.It is solved by the present invention and crosses flow problem and the enhancing MMC changes of current when symmetrically or non-symmetrically failure occurs for system net side
The low-voltage crossing ability of device.Overcurrent is effectively inhibited when can be to failure, while enhances the low-voltage crossing ability of transverter,
And different occasions can be effectively applied to.It is as follows：
Step 1：Modular multi-level flexible direct-current transmission system model is simplified, to test the adjustment side
Method；
Step 2：Establish system model power mathematical model；
Step 3：Determine system master method；
Step 4：Inhibit method for controlling overcurrent when determining to break down；
Step 5：It determines that MMC is idle and supports control.
The simplified model of modular multi-level flexible direct-current transmission (MMC-HVDC) system described in step 1 as shown in Figure 1,
Wherein MMC1 and MMC2 is modularization multi-level converter, and both sides AC system is equivalent to alternating-current voltage source and is exchanged by Dai Weinan
AC power is connected by impedance by transformer with MMC, and DC side is directly connected to back-to-back by cable.
Modular multi-level flexible direct-current transmission (MMC-HVDC) system model power mathematical model is established described in step 2,
The determining active and acrobatic skill power mathematic(al) representation that MMC current conversion stations are transported to from AC system.
The main control mode of more level flexible DC power transmission (MMC-HVDC) systems of determining moduleization described in step 3 is using arrow
Amount control；MMC1 is used and determines DC voltage and determines Reactive Power Control, MMC2, which is used, to be determined active power and determine reactive power control
System；Control system uses positive sequence and negative phase-sequence control strategy.
Inhibit method for controlling overcurrent when determining to break down described in step 4,2 net side does three-phase shortcircuit ground connection event in port
Barrier, Converter Station Valve side power quality when analyzing failure according to steady state power expression formula, by limiting exterior ring power PI values, inhibit
Overcurrent during failure.
The idle methods controlled of supporting of MMC are determined described in step 5 is：Reactive power can be provided when AC fault to prop up
Support alternating voltage；Further improve MMC performances, transverter net side busbar voltage when detecting failure, when alternating voltage is sagging into
Support that row is idle.
The present invention has carried out equivalent-simplification to modular multi-level flexible direct-current transmission (MMC-HVDC) system model, such as schemes
Shown in 1, to test proposed control strategy.Wherein MMC1 and MMC2 is modularization multi-level converter, and both sides exchange is
System is equivalent to alternating-current voltage source and AC impedance by Dai Weinan, AC power is connected with MMC by transformer, DC side leans against
The back of the body is directly connected to by cable.
The MMC-HVDC systems design parameter is listed by table 1.
1 system major parameter of table
The active and reactive power mathematic(al) representation that MMC current conversion stations are transported to from AC system is：
P=P0+P1sin(2ωt)+P2cos(2ωt)
Q=Q0+Q1sin(2ωt)+Q2cos(2ωt)
Wherein
U during stable stateqIt is 0, while in order to prevent power electronic devices overcurrent in MMC, negative phase-sequence electricity when controlling value and power reference
Stream is set as 0, and power expression is during so as to obtain stable state：
According to MMC converter powers expression formula during stable state, decomposition can obtain forward-order current reference value under dq axis coordinate systems
For：
Shown in Figure 2, for flexible DC power transmission using vector controlled, vector control strategy can be decomposed into inner ring electricity
Stream controller and Outer Loop Power Controller.Transverter is often held while is had to two kinds of physical quantitys of active power class and reactive power class
Control, and must be with the presence of one end to DC voltage control.MMC1 is determines DC voltage and determines Reactive Power Control, at the same time
MMC2 is determines active power and determines Reactive Power Control.Control system is using positive sequence and negative phase-sequence control control strategy, when exchange is
Positive sequence, which controls, when during system stable state or symmetric fault occurs works, and negative phase-sequence control is only in the asymmetric event of AC system generation
It is just activated during barrier.
Three-phase shortcircuit earth fault is done in test 2 net side of system port, Converter Station Valve side electric energy matter when Fig. 3 illustrates failure
Amount.It can be seen from the figure that when only conventional vector controlled, generation current reference value is controlled by outer shroud PI, then instruct interior
Circular current controls, and speed control is difficult very much quick adjusting fault current slowly, therefore can cause overcurrent in AC fault.
In order to improve the performance of MMC, according to power expression during the stable state of (4), under steady state conditions output for ±
1.5pu, by limiting exterior ring power PI values, it is possible to cross flow problem when eliminating failure, when failure the output of PI controllers stand
Quarter is reduced to 0, and after failure cleaning, after certain delay, power output is restored to the 1.5pu before failure.In order to
This control strategy validity is detected, after system addition control, 2 net side is a length of when doing at the identical place identical moment in port
The ground connection experiment of 0.25s durations three-phase shortcircuit, the current on valve side waveform of port 2 are as shown in Figure 4.
Pass through Fig. 3 and Fig. 4 fault current waveforms before and after comparison plus control, hence it is evident that it finds by limiting exterior ring power PI values,
It can be very good overcurrent problem during inhibition failure.
It is 0 by limiting exterior ring power PI values when fault in ac transmission system, we can see that very well from simulation result
Cross flow problem when inhibiting failure, however, electric grid operating person requires MMC that can provide reactive power when AC fault to prop up
It supports alternating voltage rather than power output is become 0.
In order to further improve the performance of MMC, transverter net side busbar voltage during by detecting failure, it is desirable that be when exchange
It needs to carry out idle support when voltage is sagging, according to power grid criterion, when net side busbar voltage deviation is more than Δ U limit values, high pressure
DC converter needs to provide reactive current support, and Fig. 5 shows that reactive current injection grade and net survey busbar voltage deviation are closed
System.It is symmetrical or unbalanced fault further according to whether occurring negative sequence component differentiation in system, when symmetric fault generates positive sequence
Reactive current supports reference valueNegative phase-sequence reactive current is generated during unbalanced fault and supports reference value
When symmetrical alternating current failure occurs for net side, Outer Loop Power Controller PI values are set as 0, pass through Fig. 5 voltage deviation controls
System strategy is generated with three-phase fault signalValue, while by Regulate signalIt is added toThere was only inner ring at this time
Current control and positive sequence active component support signalIt works, net side symmetric fault positive sequence control strategy is as shown in Figure 6.
Changed power when Fig. 8 illustrates port 2 from 0 second to 2 second, system operation is active in nominal before the failure
Power is that -230MW (transverter is inverter in 2 function of port, and electric energy is provided for AC network) reactive power is -40MVar.
When AC fault occurs, active power drops to 0, and transverter starts to get over the reactive power of 100MVar to AC system injection,
Transverter has capacity of self-regulation in itself.
As generation asymmetrical alternating current failure, idAnd iqPositive sequence instruction be set as 0, as shown in figure 9, another Regulate signalIt is added toIn signal, failure phase phase voltage deviation virtual value and fault-signal are used for calculating
Singlephase earth fault is done on 2 ac bus of port at the 0.5s moment, fault time continues 0.25s, to detect
The low-voltage crossing ability of negative phase-sequence control.As shown in Figure 10, when c phase faults occur for net side, valve side c phases are instantaneously fallen with b phase voltages
It falls, non-faulting phase a phase voltages remain unchanged.Negative phase-sequence control provides negative-sequence currentB and c two-phase voltages is maintained to remain unchanged,
Meet low-voltage crossing curve requirement.Flow problem was not present in fault current during simultaneous faults, demonstrated negative phase-sequence control suppression well
It has made and has crossed flow problem.
I during Figure 11 is depicted from 0 second to 2 seconddPositive and negative sequence current component, when asymmetric single-phase fault occurs, just
Sequence electric current0 is rapidly decreased to, at the same time transverter negative-sequence current control is excited, and providing negative phase-sequence to trouble point supports electric currentImprove transverter low-voltage crossing ability.
Traditional voltage source converter inner and outer ring control speed is too slow, in fault in ac transmission system meaning cause voltage fluctuation and
Overcurrent problem.The present invention proposes limitation power outer shroud PI value outputs, while to inner ring positive-negative sequence current dq decoupling control plans
Slightly, it is corresponding that positive sequence is provided separately and bears when system occurs symmetrically and during asymmetrical alternating current failure, to be controlled according to voltage on line side deviation
Sequence reactive current is supported.It finally does three in a test system relatively to test with single-phase fault to ground, the results showed that this strategy is right
The reactive current support for supporting alternating voltage is with obvious effects, and MMC transverters solve mistake caused by different AC faults well
Electric current and voltage fluctuation problem demonstrate the validity of proposed control strategy.
The foregoing is merely the preferred embodiments of the present invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention,
It should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of flexible direct-current transmission converter power regulating method, it is characterised in that：It is as follows：
Step 1：Modular multi-level flexible direct-current transmission system model is simplified, to test the method for adjustment；
Step 2：Establish system model power mathematical model；
Step 3：Determine system master method；
Step 4：Inhibit method for controlling overcurrent when determining to break down；
Step 5：It determines that MMC is idle and supports control.
2. flexible direct-current transmission converter power regulating method according to claim 1, it is characterised in that：Described in step 1
Modular multi-level flexible direct-current transmission system simplified model, MMC1 therein and MMC2 are the modular multilevel change of current
Device, both sides AC system are equivalent to alternating-current voltage source and AC impedance by Dai Weinan, by transformer by AC power and MMC phases
Even, DC side is directly connected to back-to-back by cable.
3. flexible direct-current transmission converter power regulating method according to claim 1, it is characterised in that：Described in step 2
System model power mathematical model is established, determines to be transported to the active and acrobatic skill power mathematical table of MMC current conversion stations from AC system
Up to formula.
4. flexible direct-current transmission converter power regulating method according to claim 1, it is characterised in that：Described in step 3
Determine that the main control mode of system uses vector controlled；MMC1 is used and determines DC voltage and determines Reactive Power Control, MMC2 is adopted
With determining active power and determine Reactive Power Control；Control system uses positive sequence and negative phase-sequence control strategy.
5. flexible direct-current transmission converter power regulating method according to claim 1, it is characterised in that：Described in step 4
Inhibit method for controlling overcurrent when determining to break down, 2 net side does three-phase shortcircuit earth fault in port, change of current when analyzing failure
It stands valve side power quality, according to steady state power expression formula, by limiting exterior ring power PI values, overcurrent when inhibiting failure.
6. flexible direct-current transmission converter power regulating method according to claim 1, it is characterised in that：Described in step 5
Determining the idle methods controlled of supporting of MMC is：Reactive power can be provided when AC fault to support alternating voltage；Further
Improve MMC performances, transverter net side busbar voltage when detecting failure carries out idle support when alternating voltage is sagging.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038658A (en) * | 2018-07-24 | 2018-12-18 | 全球能源互联网研究院有限公司 | Off-lying sea wind-powered electricity generation flexible direct current transmitting system and land AC single phase ground fault traversing method |
| CN109378859A (en) * | 2018-11-15 | 2019-02-22 | 深圳市禾望电气股份有限公司 | High pressure traversing control method, static reactive generator and storage medium |
| CN109546675A (en) * | 2019-01-08 | 2019-03-29 | 云南电网有限责任公司 | Series connection MMC inverter control method for coordinating for high pressure flexible direct current system |
| CN110048455A (en) * | 2019-04-24 | 2019-07-23 | 湖南大学 | Sagging control inverter and its control method with weak grid fault ride-through capacity |
| CN110426664A (en) * | 2019-08-07 | 2019-11-08 | 浙江大学 | A kind of the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method of two current sensors of band |
| CN112306043A (en) * | 2020-11-06 | 2021-02-02 | 广东电网有限责任公司佛山供电局 | Test method for three-port MMC energy control device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038658A (en) * | 2018-07-24 | 2018-12-18 | 全球能源互联网研究院有限公司 | Off-lying sea wind-powered electricity generation flexible direct current transmitting system and land AC single phase ground fault traversing method |
| CN109378859A (en) * | 2018-11-15 | 2019-02-22 | 深圳市禾望电气股份有限公司 | High pressure traversing control method, static reactive generator and storage medium |
| CN109378859B (en) * | 2018-11-15 | 2022-06-24 | 深圳市禾望电气股份有限公司 | High voltage ride through control method, static var generator and storage medium |
| CN109546675A (en) * | 2019-01-08 | 2019-03-29 | 云南电网有限责任公司 | Series connection MMC inverter control method for coordinating for high pressure flexible direct current system |
| CN109546675B (en) * | 2019-01-08 | 2022-07-01 | 云南电网有限责任公司 | Coordination control method for serial MMC current converter of high-voltage flexible direct-current system |
| CN110048455A (en) * | 2019-04-24 | 2019-07-23 | 湖南大学 | Sagging control inverter and its control method with weak grid fault ride-through capacity |
| CN110048455B (en) * | 2019-04-24 | 2021-06-01 | 湖南大学 | Droop control inverter with weak grid fault ride-through capability and control method thereof |
| CN110426664A (en) * | 2019-08-07 | 2019-11-08 | 浙江大学 | A kind of the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method of two current sensors of band |
| CN112398156A (en) * | 2019-11-19 | 2021-02-23 | 国网福建省电力有限公司 | Offshore wind power system fault combined ride-through method based on flexible-direct MMC current converter |
| CN112398156B (en) * | 2019-11-19 | 2023-06-23 | 国网福建省电力有限公司 | Marine wind power system fault joint traversing method based on soft-direct MMC converter |
| CN112306043A (en) * | 2020-11-06 | 2021-02-02 | 广东电网有限责任公司佛山供电局 | Test method for three-port MMC energy control device |
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