CN108539796A - Fault ride-through and energy dissipation control method for wind power bipolar flexible direct-current power grid - Google Patents
Fault ride-through and energy dissipation control method for wind power bipolar flexible direct-current power grid Download PDFInfo
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- H02J3/386—
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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]
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Abstract
The invention discloses a fault ride-through and energy dissipation control method for a wind power bipolar flexible direct-current power grid, which comprises the following steps of: 1, stabilizing the frequency of an outlet of the wind driven generator through an FPC (flexible printed circuit); 2, if the direct current voltage drop detected by the WFMMC and the GSMMC is lower than a set value, turning to 3, otherwise, continuing to detect; step 3, if the converter fails, turning to step 4, and if the direct current short circuit fails, turning to step 5; 4, the fault current converter is quitted from operation, the dissipation resistance determines the input size through a grading input strategy, and the power born by the original fault pole current converter is consumed; 5, setting the constant direct-current voltage GSMMC and the two WFMMCs as zero direct-current control, keeping the constant power GSMMC unchanged, and reducing the direct-current voltage by reducing the direct-current modulation ratio Mdc of the constant direct-current voltage GSMMC; and when the dissipation resistance device detects that the voltage of the WFMMC direct current side is lower than a set threshold value, the thyristor is controlled to be conducted, and wind power energy in a fault period is consumed through the dissipation resistance. The invention realizes no-blocking ride-through direct current fault.
Description
Technical field
The present invention relates to electric system transmission ＆ distribution electro-technical fields, more particularly, to a kind of bipolar soft straight power grid of wind-powered electricity generation
Fault traversing and energy dissipation control method.
Background technology
With the demand of generation of electricity by new energy and the development of HVDC Transmission Technology, D.C. high voltage transmission is currently widely used for greatly
In type wind-electricity integration long-distance sand transport.Establish has active reactive control using the flexible direct current power grid of modularization multi-level converter
System decoupling, can various technical advantages such as connected with passive power grid, be to realize the remote grid-connected effective ways of large-scale wind power.
In recent years, there are many scholars both at home and abroad has been carried out widely for using the control system of flexible direct current wind-electricity integration
Research.Yang Yue it is uncommon et al. (Yang Yue is uncommon, He Zhiyuan, Zhou Yang, wait the Xiamen ± 320kV flexible DC power transmission engineerings control mode and
Runnability [J] intelligent grids, 2016,4 (3):The Controlling operation method of true dipolar configuration 229-234.) is had studied, it is positive and negative
Pole is completely independent, and when monopole breaks down, non-faulting pole still can improve the operational reliability of system with transimission power,
It is with a wide range of applications in multiterminal element power grid.
In remote distance power conveying, multiterminal element power grid generally use overhead line is attached.Due to overhead transmission line event
Barrier rate is high, and flexible direct current power grid need to have line fault processing capacity, while to prevent current conversion station from breaking down, flexible direct current electricity
Net should also have converter fault processing capacity.For DC line fault, current research focuses primarily upon pseudo- bipolar, point-to-point
It the Fault Isolation of system and passes through, and the fault handling method after networking for multiterminal is still not clear；For converter fault, mesh
Before have scholar propose receiving end current conversion station it is out of service after power turn generation strategy, but for the even more serious sending end change of current of situation
The control of device failure operation rarely has research.
By half-bridge submodule (half bridge sub-module, HBSM) and full-bridge submodule (full bridge
Sub-module, FBSM) composition mixed type multi-level converter (modular multilevel converter, MMC) tool
Standby AC/DC decoupling ability, can not be latched transverter through fault, and can be continuously wind turbine and provide alternating voltage support, therefore
The failure problems of power grid can be successfully managed using mixed type MMC structure flexible direct current power grids.But existing literature is focused on mixing
The ontology research of mould assembly MMC, such as submodule proportional arrangement, the design etc. of DC Line Fault traverse controller, for being applied to wind
The grid-connected research of electricity is seldom, multiterminal element (multi-terminal DC, MTDC) system-level malfunction operation especially containing wind-powered electricity generation
Control research.
Either current conversion station or DC line fault, due to wind power plant during failure continuous output power, if not adopting
Energy dissipation measure, superfluous power is taken to be filled into MMC, it will to lead to current conversion station submodule capacitance overvoltage even power grid
Collapse.In order to solve this problem, (Dong Xu, high Stump, Wang Feng yearn for Dong Xu et al., wait wind-powered electricity generations through making somebody a mere figurehead flexible DC power transmission
Grid-connected alternating current-direct current fault traversing technology [J] the Automation of Electric Systems of circuit, 2016,40 (18):It 48-55.) proposes straight
The method of parallel connection resistance for dissipation on Flow Line, to absorb wind power during failure, but its required resistance is excessive, and at
This height takes up a large area.
Further, above-mentioned existing scheme is directed to more using flexible DC transmission technology progress wind-electricity integration composition
Alternating current-direct current fault traversing, fault energy dissipation and the submodule internal overvoltage of bipolar DC power grid is held to carry out comprehensive analysis.
Invention content
In view of the drawbacks of the prior art, it is an object of the invention to solve existing scheme for defeated using flexible direct current
Power technology carries out wind-electricity integration and constitutes in the alternating current-direct current fault traversing of multiterminal bipolar DC power grid, fault energy dissipation and submodule
Portion's overvoltage carries out the technical issues of comprehensive analysis.
To achieve the above object, the present invention provides fault traversing and the energy dissipation control of a kind of bipolar soft straight power grid of wind-powered electricity generation
Method, the bipolar soft straight power grid of wind-powered electricity generation include 3 wind power plants, two wind farm side current conversion stations (wind farm MMC, WFMMC), two
A grid side current conversion station (grid side MMC, GSMMC) resistance for dissipation device and copped wave resistance device, wherein：Wind power plant is defeated
Go out and connect by AC three-phase busbar between wind farm side current conversion station WFMMC, wind farm side current conversion station WFMMC is changed with grid side
Positive and negative anodes transverter in station is separately connected using double back DC power transmission line between the GSMMC of stream station；The resistance for dissipation device is simultaneously
It is associated in the exchange side of two wind farm side current conversion station WFMMC, the copped wave resistance device is connected in parallel on total power inside wind power plant and becomes
Between the DC link positive and negative anodes of frequency device, including：
Step (1) makes wind-driven generator export frequency stabilization by total power frequency converter FPC, and wind power generator uses paddle
Elongation control realizes that maximal power tracing, total power frequency converter FPC pusher sides use constant dc power control, total power frequency converter FPC electricity
Net side uses constant DC voltage control, to export stable wind power；
The wind farm side current conversion station WFMMC and grid side current conversion station GSMMC is with DC Line Fault ride-through capability
Using alternating voltage control is determined, grid side current conversion station GSMMC, which is used, determines direct current by mixed type MMC, wind farm side current conversion station WFMMC
Voltage-controlled system；
The each current conversion station of step (2) judges whether bipolar soft straight power grid breaks down by detecting its DC port voltage,
If wind farm side current conversion station WFMMC and grid side current conversion station GSMMC detection DC voltages fall less than setting value, bipolar soft straight
Grid collapses, go to step (3), otherwise continue to detect；
Step (3) judges short trouble type, makes different disposition；Converter fault is then gone to step (4), direct-current short circuit event
Barrier is then gone to step (5), wherein converter fault refers to connection wind farm side current conversion station WFMMC monopole converter faults；Direct-current short circuit
Failure refers to the DC line short trouble between wind farm side current conversion station WFMMC and grid side current conversion station GSMMC；
(4) the failure pole transverter of wind farm side current conversion station WFMMC is out of service, system top level control issues dissipation electricity
Resistance control thyristor input instruction, resistance for dissipation determine input size by being classified input strategy, consume the change of current of original failure pole
The power that device undertakes；
(5) DC voltage current conversion station GSMMC will be determined and two wind farm side current conversion station WFMMC are set as zero direct current flow control
System, determines power current conversion station GSMMC and remains unchanged, and determines DC voltage current conversion station GSMMC HVDC Modulation ratio Mdc by reducing, reduces
DC voltage is not latched operation to realize；When resistance for dissipation device detection wind farm side current conversion station WFMMC DC voltages are less than
Given threshold time control turn on thyristors determines input size by resistance for dissipation grading control strategy, consumes wind during failure
Electric flux；
After Failure elimination, the grid side current conversion station GSMMC that zero DC current controls is reverted into constant DC voltage control,
Reference voltage level makes DC voltage rapid increase stablize using oblique ascension function；Wind farm side current conversion station WFMMC reverts to submodule
Average voltage controls, and wind power re-starts conveying；
The copped wave resistance device limits wind turbine by detecting the DC voltage of total power frequency converter after Failure elimination
Power output ensures that the safety of wind power is sent out, goes to step (2).
Optionally, the exchange outer shroud of wind farm side current conversion station WFMMC is exchanged using alternating voltage amplitude and FREQUENCY CONTROL is determined
Outer shroud exports alternating current reference value and exchanges inner ring to it, so that alternating current tracking is increased by PI controls and stablizes to rated value；
The direct current outer shroud of wind farm side current conversion station WFMMC is controlled using submodule average capacitor voltage, and direct current outer shroud exports DC voltage
Reference value is controlled by PI to direct current inner ring and generates HVDC Modulation ratio Mdc, to export DC voltage.
Optionally, in the step (5), resistance for dissipation detects wind farm side current conversion station WFMMC DC side DC voltages
It is put into when less than 0.9pu, for absorbing remaining wind-powered electricity generation energy, to protect WFMMC submodules safety and fan safe；In event
After barrier is removed, the cut-out of resistance for dissipation device.
Optionally, two wind farm side current conversion station WFMMC and two grid side current conversion station GSMMC include A, B, C three-phase,
Per being mutually made of upper and lower two bridge arms, each bridge arm is made of semi-bridge type submodule and the mixing of bridge-type submodule equal proportion；
When normal work, two wind farm side current conversion station WFMMC are for determining grid entry point alternating voltage, a grid side current conversion station
GSMMC is used to determine the active power that it is received, another grid side current conversion station GSMMC is for determining DC voltage.
Optionally, the exchange outer shroud reference value of the grid side current conversion station GSMMC controls is all submodule electricity of transverter
Hold average voltage, grid side current conversion station GSMMC inner ring controls alternating current；One grid side current conversion station GSMMC is straight
It flows outer shroud and uses constant dc power control, another grid side current conversion station GSMMC direct current outer shroud uses DC voltage control, for stablizing
The DC voltage of the bipolar soft straight power grid of entire wind-powered electricity generation.
Optionally, the resistance for dissipation device realizes switching using high speed thyristor control resistance for dissipation；Wind power plant is set
Fluctuation threshold puts into the resistance for dissipation device to side current conversion station WFMMC DC voltages when threshold value is less than lower limiting value up and down, prevents
The power electronic devices in wind power damage wind farm side current conversion station WFMMC during failure.
Optionally, the resistance for dissipation classification input strategy meets dissipation need according to different wind power outputs and fault type
It asks, if wind power plant nominal output is PN, output of wind electric field is ρ P in actual motionN(0≤ρ≤1), ρ=Pout/PN, ρ is practical transports
Row power perunit value, PoutFor real output, resistance for dissipation is by being classified input strategy：
Work as ρ<0.5, when DC line fault, resistance for dissipation puts into 70 Ω, and when sending end converter fault, resistance for dissipation is not thrown
Enter；
When ρ=0.5, DC line fault, resistance for dissipation puts into 70 Ω, and when sending end converter fault, resistance for dissipation is thrown
Enter 140 Ω；
When 0.5<ρ<0.75, when DC line fault, resistance for dissipation puts into 35 Ω, and when sending end converter fault, dissipate electricity
105 Ω of resistance input；
When 0.75≤ρ≤1, DC line fault, resistance for dissipation puts into 35 Ω, and when sending end converter fault, dissipate electricity
70 Ω of resistance input.
Optionally, the copped wave resistance device is located in total power frequency converter FPC, and the deviation of FPC DC voltages is passed through
It is compared with triangular wave after PI links, to determine the conducting dutycycle of chopper circuit；When FPC DC voltages are more than amplitude limit value
When, input copped wave resistance inhibits its outlet power, and wind-powered electricity generation is made steadily to send out.
Optionally, the controlled volume of the submodule average capacitor voltage control is the average electricity of three-phase bridge arm whole submodule
Hold voltage, submodule average capacitor voltage equalization stable is made by given command value 1pu.
Optionally, the input strategy of the controller of each current conversion station, resistance for dissipation device and copped wave resistance device both can be used
Flexible direct current power transmission system of the aerial DC power transmission line as transmission of electricity medium, can also use direct current cables or direct current cables and
The flexible direct current power transmission system of direct current overhead line mixing.
It should be noted that if not doing specified otherwise, each current conversion station referred in the present invention refers to each wind power plant
Side current conversion station WFMMC and grid side current conversion station GSMMC.It does not repeat below.
Optionally, AC current control device is to include altogether based on the decoupling controller under rotational coordinates in each current conversion station
Two control channels of work(current control and reactive current control.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit：
(1) the wind-electricity integration system based on mixed type MTDC can pass through DC Line Fault without locking；It is proposed resistance for dissipation with
The switching criterion of the strategy of wind-powered electricity generation energy when the cooperation of copped wave resistance absorbs failure, resistance for dissipation and copped wave resistance detects local letter
Number amount, needs not rely upon the communication of leaving from station of long distance.
(2) rely on resistance for dissipation classification input, when system sending end monopole transverter is out of service because of failure, absorb superfluous
Energy makes wind turbine be able to maintain that normal operation, system operation smooth transition, power continuous transmission.
(3) submodule is controlled using average capacitor voltage, makes MMC submodules capacitor in transverter and line fault process
In operate within the scope of 0.8~1.2pu always, provide alternating voltage for grid entry point, protect the safe operation of system.
Description of the drawings
Fig. 1 is the mixed type MMC topology diagrams provided by the invention being made of bridge-type submodule semi-bridge type submodule；
Fig. 2 is provided by the invention using the very bipolar MMC-MTDC wind-electricity integrations topological structure schematic diagrames of mixed type MMC；
Fig. 3 is the logic diagram that the system failure provided by the invention differentiates detection；
Fig. 4 is the control structure block diagram of mixed type MTDC wind-electricity integration systems provided by the invention；
Fig. 5 is the control strategy schematic diagram of resistance for dissipation provided by the invention and copped wave resistance；
Fig. 6 is the power flow distribution schematic diagram of DC grid before and after converter fault provided by the invention；Wherein, Fig. 6
(a) it is normal operation DC grid power flow, Fig. 6 (b) is DC grid power flow after converter fault；
Fig. 7 is monopole transverter provided by the invention simulation result schematic diagram out of service；Wherein, Fig. 7 (a) is direct current
Line voltage distribution, Fig. 7 (b) are failure pole and non-faulting pole DC line electric current, and Fig. 7 (c) is grid entry point alternating voltage, and Fig. 7 (d) is
Wind field side current conversion station submodule average capacitor voltage, Fig. 7 (e) are the positive converter power of each current conversion station, and Fig. 7 (f) is respectively to change
The cathode converter power at station is flowed, the transimission power of Fig. 7 (g) positive circuits between each current conversion station, Fig. 7 (h) is between each current conversion station
The transimission power of anode circuit, Fig. 7 (i) are resistance for dissipation absorbed power；
Fig. 8 is the simulation result that DC bipolar short trouble provided by the invention passes through；Wherein, Fig. 8 (a) is DC line
Voltage, Fig. 8 (b) are grid-connected side alternating voltage, and Fig. 8 (c) is monopolar line transimission power, and Fig. 8 (d) is monopole converter power,
Fig. 8 (e) is DC line electric current, and Fig. 8 (f) is grid side current conversion station A phase bridge arm currents, and Fig. 8 (g) is wind farm side current conversion station A
Phase bridge arm current, Fig. 8 (h) be resistance for dissipation absorbed power, Fig. 8 (i) be give, receiving end current conversion station submodule average capacitor voltage,
Fig. 8 (j) is copped wave resistance absorption power, and Fig. 8 (k) controls for resistance for dissipation switching, and Fig. 8 (l) controls for copped wave resistance switching.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be 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.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of wind-powered electricity generations to connect bipolar soft straight power grid
Fault traversing and classification energy dissipation control method, its object is to make no matter normal operation or transverter or AC line
During the failure of road, it may ensure that ac and dc current, voltage maintain in safe range.Wind turbine is able to maintain that normal operation, from
And realize that the alternating current-direct current failure of wind-electricity integration system is passed through and fast quick-recovery without locking, solve alternating current-direct current of the existing technology therefore
The lower wind turbine off-grid problem of barrier.
The specific technical solution of above-mentioned purpose to realize the present invention, use is as follows：
A kind of wind-powered electricity generation connects the fault traversing and classification energy dissipation control method of bipolar soft straight power grid, the flexible direct current
Power grid include 3 wind power plants, 2 wind farm side current conversion stations WFMMC1 and WFMMC2, two grid side current conversion station GSMMC1 and
GSMMC2,3 groups of resistance for dissipation devices and 3 groups of copped wave resistance devices, wherein each current conversion station is made of positive and negative polarities transverter,
Wind power plant export and wind farm side current conversion station WFMMC between is connected by AC three-phase busbar, wind farm side current conversion station WFMMC with
Between grid side current conversion station GSMMC positive and negative anodes transverter is separately connected using twice DC power transmission lines；The resistance for dissipation dress
The exchange side for being connected in parallel on WFMMC is set, the copped wave resistance device is connected in parallel on the DC contact of total power frequency converter inside wind power plant
Between line positive and negative anodes；This approach includes the following steps：
(1) wind-driven generator outlet frequency stabilizes to 50Hz by total power frequency converter FPC, and wind-driven generator uses pitch
Angle control realizes that maximal power tracing, the pusher side of total power frequency converter FPC use constant dc power control, and grid side, which uses, determines direct current
Voltage controls, to export stable wind power；The four end current conversion stations for forming flexible direct current power grid are with DC Line Fault
The mixed type MMC of ride-through capability；Wind farm side WFMMC1, WFMMC2 are used using alternating voltage control, grid side GSMMC3 is determined
Constant dc power control, GSMMC4 use constant DC voltage control；
(2) each current conversion station judges whether flexible direct current network breaks down, is then by detecting its DC port voltage
(3) are gone to step, otherwise continue to detect；The current conversion station includes wind farm side WFMMC and grid side GSMMC；
(3) failure judgement type makes different disposition；Converter fault then goes to step (4), and (system issues the change of current of failure pole
Device instruction out of service), DC line fault then goes to step (5), and (grid side GSMMC and wind farm side WFMMC detections are straight at this time
When flowing Voltage Drop less than setting value)；
The converter fault refers to wind farm side current conversion station WFMMC2 monopole converter faults；The DC line fault refers to
DC line short trouble between wind farm side current conversion station WFMMC and grid side GSMMC；
(4) transverter operating status is detected, when a failure occurs it, superior system issues current conversion station exit instruction, and triggers
The anti-parallel thyristor conducting for controlling resistance for dissipation selects resistance for dissipation classification to dissipate according to wind power output situation；
Failure pole DC grid may be regarded as three end ring network operations at this time, wherein determine power GSMMC3 and balanced station GSMMC4 it
Between power transmission reversion；Four end ring net of non-faulting pole still maintains normal operation.
(5) when grid side GSMMC and wind farm side WFMMC detection DC voltages are fallen less than setting value, setting value is optional
0.9pu shows generation direct-current short circuit failure, and being changed commanders by DC control ring cutting, it is set as the control of zero DC current, passes through
Its HVDC Modulation ratio Mdc is reduced, DC voltage is reduced, operation is not latched to realize；When resistance for dissipation device detects WFMMC direct currents
Side voltage is less than given threshold time control turn on thyristors, and resistance for dissipation selects suitable resistance value according to classification input strategy, disappears
Wind-powered electricity generation energy during consumption failure；
After DC Line Fault is removed, resistance for dissipation branch cut-out, grid side GSMMC4 reverts to constant DC voltage control, joins
Examine voltage value makes DC voltage tracking stablize using oblique ascension function；Wind farm side WFMMC can be enabled to revert to by DC control ring
Submodule average voltage controls, and wind power re-starts conveying；The copped wave resistance device is by detecting total power frequency converter
DC voltage, after Failure elimination, limit power of fan output, ensure wind power safety send out, go to step (2).
Fault traversing control of the present invention and energy dissipation method, mixed type MMC, that is, grid side GSMMC and wind power plant
Side WFMMC realizes the independent control of alternating current-direct current control, further passes through existing modulation strategy by AC/DC decoupling so that
Each bridge arm exports each bridge arm output voltage reference value, you can realizes the control simultaneously to alternating current and DC current.In direct current
DC voltage is reduced by negative input submodule when failure, achievees the effect that pass through DC Line Fault, while resistance for dissipation without locking
Surplus power during coordinating MMC to absorb failure ensures the safe operation of transverter and wind turbine.
Preferably, the exchange outer shroud of wind farm side WFMMC is handed over using alternating voltage amplitude and FREQUENCY CONTROL, outer shroud output is determined
Current reference value is flowed to its inner ring, so that alternating current tracking is increased by PI controls and is stablized to rated value；Wind farm side WFMMC's
Direct current outer shroud is controlled using submodule average capacitor voltage, and output direct voltage reference value to direct current inner ring is controlled by PI and produced
Raw HVDC Modulation ratio Mdc, to export DC voltage.
Preferably, in the step (5), resistance for dissipation detects to be put into when DC voltage is less than 0.9pu, surplus for absorbing
Remaining wind-powered electricity generation energy, to protect MMC submodules safety and fan safe.
Preferably, the current conversion station include A, B, C three-phase, per mutually be made of upper and lower two bridge arms, each bridge arm by
Semi-bridge type submodule and bridge-type submodule equal proportion mixing composition；When normal work, WFMMC1, WFMMC2 are for determining wind-powered electricity generation
Grid entry point alternating voltage；GSMMC3 receives active power for determining, GSMMC4 is for determining DC voltage.
Preferably, the exchange outer shroud reference value of the net side GSMMC controls is flat for all submodule capacitor voltages of transverter
Mean value, net side GSMMC inner ring control alternating current；The use of net side GSMMC direct current outer shrouds determines DC voltage or determines power
Control.
Preferably, the resistance for dissipation device controls the switching of resistance for dissipation using high speed thyristor；Wind farm side is set
DC voltage fluctuation threshold value resistance for dissipation device input when less than lower limiting value, prevents the wind power during failure from damaging
Power electronic devices in transverter.Because WFMMC can run without interruption during failure, to persistently be provided for wind power plant
Alternating voltage absorbs the wind power during alternating current-direct current failure so this resistance for dissipation can be connected in parallel on WFMMC exchange side,
Required resistance value is smaller and relatively easy realization.
Preferably, the copped wave resistance device is located in total power frequency converter FPC, and the deviation of FPC DC voltages is passed through
It is compared with triangular wave after PI links, to determine the conducting dutycycle of chopper circuit；When FPC DC voltages are more than amplitude limit value
When, input copped wave resistance inhibits its outlet power, and wind-powered electricity generation is made steadily to send out.Why in this way, being because of wind after fault clearance
Electrical power is sent out again, and DC current is also not up to rated value at this time, and the wind power injection of quota can make transverter submodule
Overvoltage.
Preferably, the HVDC Modulation ratio Mdc amplitude limits of all MMC are 1.2pu, ensure that DC line insulation is not destroyed, are
System being capable of safe operation.
Preferably, AC current control device is to include altogether based on the decoupling controller under rotational coordinates in each current conversion station
Two control channels of work(current control and reactive current control.
Preferably, the controlled volume of the submodule average capacitor voltage control is the average electricity of three-phase bridge arm whole submodule
Hold voltage, submodule average capacitor voltage equalization stable is made by given command value 1pu.
Preferably, the input strategy of the controller of each current conversion station, resistance for dissipation device and copped wave resistance device both can be used
Flexible direct current power transmission system of the aerial DC power transmission line as transmission of electricity medium, can also use direct current cables or direct current cables and
The flexible direct current power transmission system of direct current overhead line mixing.
Apoplexy of the present invention is electrically connected the fault traversing of bipolar soft straight power grid and classification energy dissipation control method includes altogether
WFMMC controls, GSMMC controls and energy dissipation control four control systems.Wherein permanent magnet synchronous wind generator uses pitch
Angle control realizes that the generator-side converter wear of maximal power tracing (full power converter, FPC) uses constant dc power control, net
Side current transformer uses constant DC voltage control, to export stable wind power.The wind farm side of mixed type MMC is handed over using fixed
The voltage-controlled system of galvanic electricity, grid side use constant DC voltage control and constant dc power control, controlled during DC Line Fault, so that it is guaranteed that directly
During flowing failure, overcurrent does not occur for the semiconductor devices of current conversion station.
GSMMC uses AC/DC decoupling independent control, including ac control circuit and DC loop.Ac control circuit will
The capacitance voltage control of all submodules is constant, to maintain the active power balance of system alternating current-direct current side.DC control ring is adopted
With double-closed-loop control, outer shroud controls DC voltage or active power, and inner ring controls DC current, when detecting failure, by changing
The reference value of circular current in becoming, realizes fault traversing.
Wherein, current inner loop control is based on the decoupling control under rotational coordinates, includes active current control and idle altogether
Two control channels of current control.The command value of watt current is generated by an active outer ring controller, the active outer shroud control
Device is used to control the total energy energy or the characterization such as all submodule capacitor voltage average values of MMC or DC voltage MMC of MMC storages
The physical quantity of institute's storage energy.
Wherein, since wind power plant is passive system, exchange side voltage should be supported by WFMMC.The exchange of WFMMC controls back
Road is controlled for controlling alternating voltage, DC control outer shroud using submodule average capacitor voltage, one side control submodule electricity
Hold voltage to maintain to stablize, another aspect system is used as the channel of alternating current-direct current power transmission by submodule capacitor voltage, is had
The transmission of work(power.
Wherein, the output of the AC current control device is MMC AC modulation ratios, and the output of DC current controller is
MMC HVDC Modulation ratios can reduce the HVDC Modulation ratio of GSMMC by negative input full-bridge submodule, to realize zero direct current
Pressure operation.
During current conversion station or DC Line Fault, although mixed type MMC may be implemented to run without locking, due to wind power
Receiving end can not be got forwarded to, will be filled into transverter causes submodule capacitance over-pressed, endangers the safety of whole system.Using current conversion station
Between communicate, allow wind turbine downrating to be a kind of feasible coping style.But this method is due to depending on communication, response speed
Slowly, and communication system can also impact the control during failure.
Although the mode of addition resistance for dissipation increases extra cost, but it has ensured the safety of system, dissipative effect
Also more excellent.Since WFMMC can run without interruption during failure, to persistently provide alternating voltage for wind power plant, because
This proposes one kind R in WFMMC exchange side parallel three phase resistance for dissipation, installation position such as Figure of abstract1It is shown, required resistance
It is worth smaller and relatively easy realization.Meanwhile in order to ensure the safety of transverter in the system recovery procedure after fault clearance, in wind
FPC installs copped wave resistance in machine, and guarantee system, which restores power, steadily to be sent out, R in installation position such as Figure of abstract2Institute
Show.
The DC voltage value of detection WFMMC is compared with threshold value in real time, exports switching signal to resistance for dissipation.Inspection in real time
The DC voltage for surveying FPC, copped wave resistance is controlled by the way of duty ratio, avoids fan outlet overtension.Selected threshold is answered
Pay attention to avoiding the fluctuation range of voltage normal operation, in order to avoid controller is caused to malfunction.To ensure that resistance for dissipation can accurately be thrown
It cuts, its shutdown is controlled using antiparallel thyristor, copped wave resistance controls break-make using IGBT, and the two turn-off time is in microsecond
Rank.
Fig. 1 is the mixed type MMC topologys that control system proposed by the invention can be used, and each bridge arm is by half full-bridge
Submodule FBSM and half half-bridge submodule HBSM are connected in series.Each bridge arm contains the submodule that can export negative voltage,
DC voltage can be adjusted while bridge arm submodule capacitor voltage remains specified.Wherein, Va, Vb and Vc be respectively A, B,
Each phase voltage value of C three-phases, R are bridge arm equivalent resistance, and L is bridge arm reactor, and Vdc is DC voltage, and Vpa, Vna are respectively up and down
Bridge arm output voltage.Control system designed by the present invention is suitable for various it is known that bridge arm, which has output, continues negative voltage
The MMC topologys of ability.
Fig. 2 show the soft straight wind-electricity integration system topological in bipolar four end, as shown in Fig. 2, including 3 wind power plants, two wind
It electric field side current conversion station WFMMC1 and WFMMC2, two grid side current conversion stations GSMMC1 and GSMMC2, resistance for dissipation device and cuts
Wave resistance device, wherein：Wind power plant, which is exported, to be connected between wind farm side current conversion station WFMMC by AC three-phase busbar, wind-powered electricity generation
Positive and negative anodes in station are separately connected using double back DC power transmission line between the side current conversion station WFMMC and grid side current conversion station GSMMC of field
Transverter；Resistance for dissipation device is connected in parallel on the exchange side of two wind farm side current conversion station WFMMC, and copped wave resistance device is connected in parallel on wind
Inside electric field between the DC link positive and negative anodes of total power frequency converter.Wherein, wind farm side current conversion station WFMMC1 and WFMMC2
Alternatively referred to as mixed type MMC1 and mixed type MMC2, grid side current conversion station GSMMC1 alternatively referred to as determine power current conversion station or mixed type
MMC3, grid side current conversion station GSMMC2 alternatively referred to as determine DC voltage current conversion station or mixed type MMC4.As shown in Fig. 2, the electricity that dissipates
It hinders in device such as figure shown in R1, copped wave resistance device R2 is connected in parallel between the DC link of FPC.
The bipolar soft straight wind-electricity integration system topological in four ends summarizes 3 large-scale permanent magnet direct-driven wind power plant, fan outlet
It is separately connected by step-up transformer and wind field side current conversion station.Four flexible direct current converter stations connect into looped network knot by overhead line
Structure, and dc circuit breaker is installed at every circuit both ends, facilitate and carries out line maintenance or isolation.
Four end flexible direct current looped networks in Fig. 2 are by 1 adjustable power current conversion station, the balance of 1 control network voltage
Current conversion station and 2 wind field side current conversion station compositions, each current conversion station are all made of the bipolar metallic return ground connection mode of connection, each pole change of current
Device is all made of the mixed type MMC topologys having without locking fault ride-through capacity.F in Fig. 21Positive transverter occurs for sending end MMC2
Failure, F2When being overhauled for MMC1 and MMC4 DC lines, DC bipolar short trouble occurs for MMC2 and MMC3.For during making failure
System can normal operation, the exchange outlet resistance for dissipation R in parallel of current conversion station in wind field side1, bypassed by 4 groups of identical bands
Switch Ski(i=1,2,3,4) resistance RminIn series, resistance value can be according to the different flexible modulations of wind field output.In total power
Current transformer DC link interpolar installs copped wave resistance R2Limit fan outlet power, by with resistance for dissipation R1Cooperation, realize
Energy collaboration dissipates during failure.For ensure resistance for dissipation can accurate switching, its shutdown is controlled using antiparallel thyristor,
Copped wave resistance controls break-make using IGBT, and the two turn-off time is in microsecond rank.Due in remote extensive power transmission
In generally overhead line is used to convey, therefore the present invention is illustrated by taking overhead line as an example, and the control method proposed is equally applicable to
Using the flexible direct current power transmission system of direct current cables or direct current cables and direct current overhead line series-parallel connection circuit.
Fig. 3 is the logic diagram that the system failure proposed by the invention differentiates detection.As shown in figure 3, fault distinguishing includes
Following steps：
Each current conversion station judges whether flexible direct current network breaks down, is, sentence by detecting its DC port voltage
Disconnected fault type, makes different disposition, otherwise continues to detect.
Then system issues the instruction out of service of failure pole transverter to converter fault, and superior system issues current conversion station and exits finger
It enables, and triggers the anti-parallel thyristor conducting of control resistance for dissipation, select resistance for dissipation classification to dissipate according to wind power output situation；
Failure pole DC grid may be regarded as three end ring network operations at this time, wherein determining the power between power GSMMC3 and balanced station GSMMC4
Transmission reversion；Four end ring net of non-faulting pole still maintains normal operation.Grid side GSMMC and wind farm side WFMMC detect direct current
When Voltage Drop is less than setting value, the optional 0.9pu of setting value shows that direct-current short circuit failure occurs, can pass through DC control ring cutting
Changing commanders, it is set as the control of zero DC current, by reducing its HVDC Modulation ratio Mdc, reduces DC voltage, is not latched with realizing
Operation；When resistance for dissipation device detection WFMMC DC voltages are less than given threshold time control turn on thyristors, resistance for dissipation root
Suitable resistance value is selected according to classification input strategy, consumes wind-powered electricity generation energy during failure.
After DC Line Fault is removed, resistance for dissipation branch cut-out, grid side GSMMC4 reverts to constant DC voltage control, joins
Examine voltage value makes DC voltage tracking stablize using oblique ascension function；Wind farm side WFMMC can be enabled to revert to by DC control ring
Submodule average voltage controls, and wind power re-starts conveying；The copped wave resistance device is by detecting total power frequency converter
The DC voltage of FPC limits power of fan output after Failure elimination, ensures that the safety of wind power is sent out.
Fig. 4 is the control method that wind-powered electricity generation provided by the present invention connects bipolar soft straight power grid, permanent magnet synchronous wind generator
Realize that maximal power tracing, the generator-side converter wear of FPC use constant dc power control using award setting, net side current transformer is using fixed
DC voltage control, to export stable wind power.In mixed type MMC inner ring current control levels, mainly by alternating current
Flow control, DC current control are constituted.The exchange outer shroud of WFMMC determines AC current control using alternating voltage control, inner ring is determined；
Direct current outer shroud is controlled using submodule average capacitor voltage, inner ring constant DC current control.The exchange outer shroud of GSMMC uses submodule
Block average capacitor voltage controls, and inner ring determines AC current control；Direct current outer shroud constant DC voltage control or constant dc power control, inner ring
Constant DC current control.Wherein direct current inner ring and outer shroud control are Novel control circuits proposed by the invention, and conventional MMC
It includes exchange inner and outer ring control to control its inner ring current control only.According to MMC basic theories, when bridge arm circulation is adequately suppressed
When, the expression formula of bridge arm current is iarm=idc/3+iac/ 2, wherein iarm、idc、iacRespectively represent bridge arm current, DC current,
And each phase alternating currents of MMC, when DC current and alternating current are controlled simultaneously, bridge arm current will be controlled in safe range
Interior, so that it is guaranteed that under any operating mode, MMC will not be latched because of bridge arm overcurrent.Existing controller on design architecture,
Do not consider while controlling the alternating current and DC current of MMC.
Wherein, each primary variables involved in Fig. 4, physical significance ginseng are shown in Table 1：
Table 1
In the submodule average capacitor voltage control of Fig. 4, actual value can be by the sum of all submodule capacitor voltage values
After addition divided by submodule total number and obtain.During being passed through due to DC Line Fault, main input has the son of output direct current negative pressure
Module, for improve controller response speed, submodule capacitor voltage average value can also be it is all have output direct current negative pressure
The average value of the capacitance voltage of the submodule of ability.The exchange watt current command value can also be by controlling the total of MMC storages
The outer ring controller of energy generates.
In Fig. 4, receiving end current conversion station GSMMC mainly undertakes following task：1, DC voltage stability is controlled.2, wind-powered electricity generation work(is dissolved
Rate, therefore two current conversion stations of receiving end are respectively adopted constant DC voltage control and determine active power controller, the two exchange outer shroud is adopted
It is controlled with submodule average capacitor voltage, the direct current outer shroud employing mode I for determining DC voltage station makes DC voltage tracking stablize, fixed
The direct current outer shroud employing mode II of active power makes current conversion station power invariability.
State I II is to pass through control under DC bipolar short trouble in Fig. 4, when WFMMC and GSMMC detect direct current
When pressure is fallen, DC control ring cutting is changed to the control of zero DC current, to reduce HVDC Modulation ratio Mdc.Instant of failure DC voltage will
It plummets, resistance for dissipation detects to be put into when DC voltage is less than 0.9pu, for absorbing remaining wind-powered electricity generation, to protect MMC
Submodule safety and fan safe.
Bottom control includes modulation and submodule capacitor voltage Pressure and Control in Fig. 4, can refer to known technology hand
Section.By above-mentioned elaboration it is found that during normal operation and DC Line Fault, the AC current control of controller that the present invention designs with
DC current control is identical controller, is not necessarily to switch control logic, avoids control logic and be switched to what system was brought
Disturbance, substantially increases the safety of system operation.
Table 2 is that resistance for dissipation proposed by the invention is classified input control strategy, individually to collect wind power plant 1500MW, and
For the voltage 230kV of site, Rmin35 Ω, resistance for dissipation are taken to put into feelings using resistance series connection of 4 group of 35 Ω with by-pass switch
For condition as shown in the table in DC line fault, resistance for dissipation need to consume all power that wind power plant is sent out, when wind power plant exports
When less than or equal to 0.5 times of rated power, R170 Ω are needed, i.e., connect two R per phase resistance for dissipationmin；When wind power plant output is more than
When 0.5 times of rated power, R135 Ω are needed, i.e., per phase resistance for dissipation by a RminComposition.In sending end converter fault, dissipate
Resistance only needs the half-power that consumption wind-powered electricity generation place is sent out, specific resistance for dissipation classification input control strategy as shown in table 2.
Table 2
For this purpose, Fig. 5 discloses the cooperation control strategy of resistance for dissipation of the present invention and copped wave resistance.UdcpuWith
UdcminThe DC voltage actual motion value of the soft straight power grid in respectively four ends and lower threshold (perunit), BasResistance for dissipation in order to control
The IGBT group signal of input, SkControl is that resistance for dissipation is classified input control device, Ski(i=1,2,3,4) it is series connection
Resistance RminThe control signal of by-pass switch, Udcpu_fpcAnd UclinThe DC voltage actual value and upper limit threshold of respectively FPC, Scp
For the switching signal of copped wave resistance.
(1) transverter operating status is detected, when a failure occurs it, superior system issues current conversion station exit instruction, and triggers
The anti-parallel thyristor conducting for controlling resistance for dissipation selects resistance for dissipation classification to dissipate according to wind power output situation.
(2) the DC voltage perunit value of detection WFMMC is compared with lower threshold, and DC line short trouble occurs
When, DC voltage falls rapidly, when detecting its perunit value UdcpuLess than UdcminWhen (0.9pu), comparator exports switching signal
Turn on thyristors is triggered, resistance for dissipation is put at this time.According to wind power output for the demand of power dissipation, corresponding dissipate is selected
Resistance sizes.
(3) DC voltage for detecting FPC in real time, when it is more than upper limit threshold UclimWhen (1.1pu), by PI controllers and
Sluggish comparing element exports IGBT Continuity signals, and extra electric energy is passed through copped wave resistance R2It consumes, to make DC side not
Overvoltage, wind power steadily export.
When monitoring to occur DC Line Fault, in order to further decrease direct fault current, DC Line Fault can be being monitored
Afterwards, integrator DC current inner ring controlled is reset, or be set as HVDC Modulation than lower limit so that integrator is new
Initial value under start to integrate, reduce HVDC Modulation ratio.
When monitoring to occur DC Line Fault, in order to reduce the charge and discharge of submodule capacitor voltage, direct current can be being monitored
After failure, the integrator of submodule average capacitor voltage controller is reset, so that integrator starts under new initial value
Integral exchanges watt current command value after reducing DC Line Fault generation, reduces charge/discharge of the exchange side to MMC submodule capacitances
Effect.
Fig. 6 (a), (b) are failure pole transverter front and back current conversion station out of service and line power distribution, with most serious feelings
For condition lower monopole converter fault, wind power plant sends out rated power 1500MW, power distribution when each current conversion station normal operation
As shown in Fig. 6 (a)：WFMMC1 positive and negative anodes online value and power reference is 1500MW；WFMMC2 positive and negative anodes online value and power reference
It is 750MW；GSMMC3 is constant dc power control, and the off line value and power reference of positive and negative anodes is 750MW；GSMMC4 is to determine DC voltage
Control, the off line value and power reference of positive and negative anodes is 1500MW.
When MMC2 anode transverters break down, sending instructions under system keeps positive transverter out of service, dissipates at this time
Resistance puts into 70 Ω, absorbs the 750MW wind powers that original positive transverter undertakes, and positive DC power grid may be regarded as three end ring nets
Operation, wherein determining the power transmission reversion between power MMC3 and balanced station MMC4；Four end ring net of cathode still maintains normally to transport
Row.The distribution of the power of each circuit and current conversion station is as shown in Fig. 6 (b) after converter fault.
Fig. 7 (a) is the DC voltage of DC grid, it can be seen that transverter front and back DC voltage out of service remains steady
It is fixed.Fig. 7 (b) is the DC current of MMC2 positive and negative anodes, and system detectio is out of service to anode converter fault after 1.2s, flows through just
It is 0 that the DC current of pole transverter, which is reduced rapidly, and cathodal current maintains normal operation.Wind farm side mixed type MMC is transported without locking
Row, makes synchronization AC voltage continue controlled steady, as shown in Fig. 7 (c).After MMC2 anode transverters are out of service, resistance for dissipation
Input absorbs the power that original positive transverter receives, and has made average capacitor voltage in the submodule electric discharge of input moment MMC2
Fall, MMC1 is unaffected, as shown in Fig. 7 (d).Fig. 7 (e)-(h) be before and after failure in DC grid each positive and negative anodes transverter and
The power flow situation of change of DC line, it can be seen that system transimission power is only than reducing MMC2 anode transverters before failure
The power originally carried, as current conversion station and Line Flow redistribute after failure, system enters new steady-state operation.Fig. 7 (i)
It is consistent with the power shortage after the system failure for the power that MMC1 and MMC2 exchange side resistance for dissipation absorbs, demonstrate input consumption
Dissipate the validity of resistance.
In Fig. 8 (a), because failure quickly falls to zero, current conversion station detects to be switched DC voltage after DC voltage falls
It is controlled to zero DC current.Since mixed type MMC is run during failure without locking, wind field side transverter Neutron module is instantaneously put
Electricity is supplemented in time, and current conversion station can still control alternating-voltage stabilization, as shown in Fig. 8 (b).Fig. 8 (c) (d) is respectively failure
The power distribution situation of front and back monopolar line and current conversion station, it can be seen that system in 1.3s because of failure power fall down, until 1.5s work(
Rate restores conveying, and the soft straight power grid of four end wind-powered electricity generations enters open loop steady-state operation after 1.65s, and maintenance circuit restores transmission, warp after 1.8s
It crosses 0.05s systems and enters closed loop steady-state operation, it is consistent with normal operating condition before line maintenance.Fig. 8 (e)-(g) can be seen that
Although the instantaneous DC current of failure rises to twice of rated value or more, the bridge arm current of mixed type MMC is still in safe model
In enclosing.In Fig. 8 (h), when DC voltage drops to 0.9pu or less, MMC1 and MMC2 exchange side resistance for dissipation absorbs age at failure
Between the power that sends out of wind power plant, ensure balancing energy in current conversion station.Therefore, the submodule capacitance of GSMMC and WFMMC will not occur
Overvoltage and overcurrent phenomenon, as shown in Fig. 8 (i).After 1.4s fault clearances, GSMMC4 restores constant DC voltage control, WFMMC
Power between GSMMC restores conveying.The DC voltage of copped wave resistance detection FPC, prevent because wind-powered electricity generation instantaneous power it is excessively high to
Current conversion station brings harm, shown in the power such as Fig. 8 (j) absorbed.Fig. 8 (k), (l) are respectively resistance for dissipation and copped wave resistance
Switching controls signal, and the resistance for dissipation controlled using thyristor, which need to meet in 0.5ms, to be connected, the copped wave resistance controlled using IGBT
Conducting in 0.02ms need to be met.Whole system restores the operation of closed loop normal table after 1.85s, conveys rated power.
The above analysis demonstrates the soft straight power grid in four end of wind-powered electricity generation and is passed through with DC Line Fault and fast restoration capabilities, during failure
Energy dissipation unit can effectively absorb wind power.
The present invention discloses the fault traversing and classification energy dissipation control method that a kind of wind-powered electricity generation connects bipolar soft straight power grid,
When DC line fault, ac and dc current is respectively controlled by mixed type MMC, it is complete by negative input in DC Line Fault
Bridge type submodule makes MMC be operated near zero DC voltage, and DC Line Fault, which can be realized, without locking MMC passes through；It adopts
System operation reliability is improved with the bipolar mode of connection, in monopole converter fault by being classified energy dissipation control, is made non-
Failure pole is still able to maintain that normally, wind power plant during failure will not off-grid, still keep normal operation.
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, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation, which is characterized in that the wind-powered electricity generation is double
Extremely soft straight power grid includes 3 wind power plants, two wind farm side current conversion station WFMMC, two grid side current conversion station GSMMC, dissipate electricity
Device and copped wave resistance device are hindered, wherein：Wind power plant exports between wind farm side current conversion station WFMMC through AC three-phase mother
Line connects, and is separately connected using double back DC power transmission line between wind farm side current conversion station WFMMC and grid side current conversion station GSMMC
Positive and negative anodes transverter in standing；The resistance for dissipation device is connected in parallel on the exchange side of two wind farm side current conversion station WFMMC, described to cut
Wave resistance device is connected in parallel on inside wind power plant between the DC link positive and negative anodes of total power frequency converter, including：
Step (1) makes wind-driven generator export frequency stabilization by total power frequency converter FPC, and wind power generator uses propeller pitch angle
Control realizes that maximal power tracing, total power frequency converter FPC pusher sides use constant dc power control, total power frequency converter FPC grid sides
Using constant DC voltage control, to export stable wind power；
The wind farm side current conversion station WFMMC and grid side current conversion station GSMMC is the mixing with DC Line Fault ride-through capability
Using alternating voltage control is determined, grid side current conversion station GSMMC is voltage-controlled using direct current is determined by type MMC, wind farm side current conversion station WFMMC
System；
The each current conversion station of step (2) judges whether bipolar soft straight power grid breaks down, if wind by detecting its DC port voltage
Electric field side current conversion station WFMMC and grid side current conversion station GSMMC detection DC voltages fall less than setting value, then bipolar soft straight power grid
It breaks down, goes to step (3), otherwise continue to detect；
Step (3) judges short trouble type, makes different disposition；Converter fault is then gone to step (4), and direct-current short circuit failure is then
It goes to step (5), wherein converter fault refers to connection wind farm side current conversion station WFMMC monopole converter faults；Direct-current short circuit failure
Refer to the DC line short trouble between wind farm side current conversion station WFMMC and grid side current conversion station GSMMC；
(4) the failure pole transverter of wind farm side current conversion station WFMMC is out of service, system top level control issues resistance for dissipation control
The input instruction of combinations brake tube, resistance for dissipation determine input size by being classified input strategy, consume original failure pole transverter and hold
The power of load；
(5) DC voltage current conversion station GSMMC and two wind farm side current conversion station WFMMC will be determined and be set as the control of zero DC current,
Determine power current conversion station GSMMC to remain unchanged, determines DC voltage current conversion station GSMMC HVDC Modulation ratio Mdc by reducing, reduce direct current
Voltage is not latched operation to realize；When resistance for dissipation device detection wind farm side current conversion station WFMMC DC voltages are less than setting
Threshold value time control turn on thyristors determines input size by resistance for dissipation grading control strategy, consumes wind-powered electricity generation energy during failure
Amount；
After Failure elimination, the grid side current conversion station GSMMC that zero DC current controls is reverted into constant DC voltage control, is referred to
Voltage value makes DC voltage rapid increase stablize using oblique ascension function；It is average that wind farm side current conversion station WFMMC reverts to submodule
Voltage controls, and wind power re-starts conveying；
The copped wave resistance device limits power of fan by detecting the DC voltage of total power frequency converter after Failure elimination
Output ensures that the safety of wind power is sent out, goes to step (2).
2. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1, feature
It is, the exchange outer shroud of wind farm side current conversion station WFMMC is handed over using alternating voltage amplitude and FREQUENCY CONTROL, exchange outer shroud output is determined
It flows current reference value and exchanges inner ring to it, so that alternating current tracking is increased by PI controls and stablize to rated value；Wind farm side changes
The direct current outer shroud of stream station WFMMC is controlled using submodule average capacitor voltage, and direct current outer shroud exports direct voltage reference value to directly
Inner ring is flowed, is controlled by PI and generates HVDC Modulation ratio Mdc, to export DC voltage.
3. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1, feature
It is, in the step (5), when resistance for dissipation detects that wind farm side current conversion station WFMMC DC side DC voltages are less than 0.9pu
Input, for absorbing remaining wind-powered electricity generation energy, to protect WFMMC submodules safety and fan safe；After fault clearance, consumption
Dissipate resistance device cut-out.
4. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1, feature
Be, two wind farm side current conversion station WFMMC and two grid side current conversion station GSMMC include A, B, C three-phase, per mutually by it is upper,
Lower two bridge arms composition, each bridge arm are made of semi-bridge type submodule and the mixing of bridge-type submodule equal proportion；Normal work
When, two wind farm side current conversion station WFMMC are for determining grid entry point alternating voltage, and a grid side current conversion station GSMMC is for true
The fixed active power that it is received, another grid side current conversion station GSMMC is for determining DC voltage.
5. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1 or 2, special
Sign is that the exchange outer shroud reference value of the grid side current conversion station GSMMC controls is flat for all submodule capacitor voltages of transverter
Mean value, grid side current conversion station GSMMC inner ring control alternating current；One grid side current conversion station GSMMC direct current outer shroud is adopted
With constant dc power control, another grid side current conversion station GSMMC direct current outer shroud uses DC voltage control, for stablizing entire wind-powered electricity generation
The DC voltage of bipolar soft straight power grid.
6. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1 or 3, special
Sign is that the resistance for dissipation device realizes switching using high speed thyristor control resistance for dissipation；Wind farm side current conversion station is set
Fluctuation threshold puts into the resistance for dissipation device to WFMMC DC voltages when threshold value is less than lower limiting value up and down, during preventing failure
Wind power damage wind farm side current conversion station WFMMC in power electronic devices.
7. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1 or 3, special
Sign is that the resistance for dissipation classification input strategy meets dissipation requirements according to different wind power outputs and fault type, if wind-powered electricity generation
Field nominal output is PN, output of wind electric field is ρ P in actual motionN(0≤ρ≤1), ρ=Pout/PN, ρ is actual motion power mark
One value, PoutFor real output；
Work as ρ<0.5, when DC line fault, resistance for dissipation puts into 70 Ω, and when sending end converter fault, resistance for dissipation is not put into；
When ρ=0.5, DC line fault, resistance for dissipation puts into 70 Ω, when sending end converter fault, resistance for dissipation input 140
Ω；
When 0.5<ρ<0.75, when DC line fault, resistance for dissipation puts into 35 Ω, and when sending end converter fault, resistance for dissipation is thrown
Enter 105 Ω；
When 0.75≤ρ≤1, DC line fault, resistance for dissipation puts into 35 Ω, and when sending end converter fault, resistance for dissipation is thrown
Enter 70 Ω.
8. the fault traversing and energy dissipation control method of the bipolar soft straight power grid of wind-powered electricity generation according to claim 1, feature
Be, the copped wave resistance device is located in total power frequency converter FPC, by the deviation of FPC DC voltages after PI links with
Triangular wave is compared, to determine the conducting dutycycle of chopper circuit；When FPC DC voltages are more than amplitude limit value, copped wave is put into
Resistance inhibits its outlet power, and wind-powered electricity generation is made steadily to send out.
9. according to the fault traversing and energy dissipation controlling party of the bipolar soft straight power grid of claim 1-7 any one of them wind-powered electricity generations
Method, which is characterized in that the controlled volume of the submodule average capacitor voltage control is the average electricity of three-phase bridge arm whole submodule
Hold voltage, submodule average capacitor voltage equalization stable is made by given command value 1pu.
10. according to the fault traversing and energy dissipation controlling party of the bipolar soft straight power grid of claim 1-8 any one of them wind-powered electricity generations
Method, which is characterized in that frame both can be used in the input strategy of the controller of each current conversion station, resistance for dissipation device and copped wave resistance device
Flexible direct current power transmission system of the empty DC power transmission line as transmission of electricity medium, can also use direct current cables or direct current cables with it is straight
Flow the flexible direct current power transmission system of overhead line mixing.
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