CN108711883A - Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system - Google Patents
Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system Download PDFInfo
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- CN108711883A CN108711883A CN201810505866.6A CN201810505866A CN108711883A CN 108711883 A CN108711883 A CN 108711883A CN 201810505866 A CN201810505866 A CN 201810505866A CN 108711883 A CN108711883 A CN 108711883A
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/107—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of overloads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
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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
Abstract
The application provides a kind of coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system, the decompression of soft lineal wind farm side transverter of uniting is controlled and is combined with the flexible control of Wind turbines crowbar by the present invention, during monopole short-duration failure occurs for straight-flow system, system overcurrent is inhibited using the rectification bridge type crowbar protection circuits of double-fed fan rotor side, the real-time control to active power and electric current is realized by the adjusting to wind turbine set end voltage in control period, the maximized power delivering capability for realizing flexible direct current system non-faulting pole, avoid wind power plant off-grid, reduce the impact to AC network, it has the certain significance in Practical Project.
Description
Technical field
The invention belongs to technical field of electric power system control, and in particular to a kind of wind power plant is through the grid-connected system of flexible DC power transmission
The coordinate fault traversing method of system.
Background technology
For wind power plant through bipolar soft straight grid-connected system, when wherein a pole is broken down, the pole transverter is in the short time
Interior locking, the electric current and power for flowing through failure pole quickly fall to 0.Since wind farm side transverter (WFVSC) is using fixed exchange
Voltage controls and the control at the two poles of the earth is mutual indepedent, and after a wherein pole is latched, another pole transverter still is able to provide to wind power plant
Specified voltage and frequency support, therefore that its will not be reduced in response to the failure of flexible direct current power transmission system is active defeated for wind power plant
Go out.At this time active power will be transferred completely into non-faulting extremely on, cause the electric current of non-faulting pole to increase significantly, seriously threaten the pole
Normal operation.So quickly reducing the active power that wind power plant is sent out so that trigger protection action is not research to straight-flow system
Emphasis.
At present the wind power plant that uses both at home and abroad and soft straight joint fault traversing strategy include mainly voltage drop method, raising frequency method,
The methods of communication method, these methods have respective limitation.By taking voltage drop method as an example, when an error occurs, reduce wind farm side
The voltage setting value of transverter, reduces wind farm side alternating voltage to a lower value, at this time the output wattful power of wind turbine
Rate will be cut down.After fault clearance, alternating voltage control is determined in the recovery of wind farm side transverter.This kind of method be not due to being related to wind turbine
Internal protective device, is easy to generate powerful stress inside Wind turbines, and this side is used in the case of monopole failure
Method can not limit the overcurrent of non-faulting pole, also result in the locking of non-faulting pole.In addition the big ups and downs of alternating voltage can be led
Cause system it is unstable, while with this method wind power plant output power be uncontrollable.
Variable speed constant frequency wind-force based on double-fed type induction machine (double fed induction generator, DFIG)
Generator is the type that current Large Scale Wind Farm Integration mainly uses.At present the rotor of DFIG have installing crowbar protection circuit with
Inhibit rotor-side overvoltage.Rectifying bridge type crowbar protections electric routing resistance --- thyristor branch and diode rectifier bridge structure
At, by the triggering to unique thyristor in circuit come cut and cut off crowbar protect circuit, and then protect pusher side unsteady flow
Device.In the prior art, crowbar protects circuit that short trouble occurs in DFIG stators, starts when voltage seriously falls, and inhibits
DFIG rotor overcurrent helps DFIG to complete low voltage crossing.Traditional crowbar is one kind in grid collapses, wind-powered electricity generation
When field busbar voltage is fallen the device of low voltage crossing, this method and biography are realized by absorbing whole energy that wind power plant is sent out
System mode is different, the characteristics of protecting circuit using crowbar, using this controlled amounts of wind power plant busbar voltage as wind power plant with it is soft
Property DC transmission system carry out the medium of information exchange, the coupled relation between two systems during failure is established, by right
The mode of wind power plant busbar voltage soft readjustment makes Wind turbines be actively engaged in the tune of active power during DC system fault
Section inhibits the overcurrent of the non-faulting pole during soft straight failure.Simultaneously because wind power plant busbar voltage is by wind farm side transverter
Control can maximize the biography of non-faulting pole active power during failure by the value of wind power plant busbar voltage during determining failure
Defeated capacity.
Invention content
Protect circuit to inhibit the principle of rotor-side overvoltage using crowbar, by the crowbar of existing blower interior
Circuit is protected to reduce the output of wind turbine, inhibits the overcurrent of the non-faulting pole during soft straight failure.After crowbar starts,
Double-fed wind turbine is worked in the form of squirrel cage induction motor, at this time the output power P of wind turbineemMeet following functional relation：Pem=
f(Z,ω)·us 2, wherein Z is generator impedance, and ω is generator speed, and f (Z, ω) is a generator impedance and turns
The function of speed, usFor the set end voltage of wind turbine.I.e. the output power of DFIG is directly proportional to the quadratic power of set end voltage, therefore logical
The active power of output of wind turbine can be changed by overregulating set end voltage.
The application utilizes the rotor-side crowbar of traditional Wind turbines by the improvement to existing system grade control method
A kind of structure, it is proposed that coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system.The present invention is by soft direct line
The decompression control of system wind farm side transverter is combined with the control control of the power flexible of Wind turbines crowbar, straight reaching
The protection of Flow Line takes into account flexible direct current system ability to transmit electricity under the premise of requiring.When a wherein pole break down and when being latched,
By reducing the wind power plant busbar voltage of wind farm side converter Control electricity is protected to trigger the crowbar of double-fed blower interior
The control targe for preventing DC line overcurrent is realized on road.Make Wind turbines at this time by controlling wind power plant busbar voltage simultaneously
The active power of output is controllable.
The present invention essentially consists in the situation of change according to line current, active power to the improvement of wind-powered electricity generation field control method,
The set end voltage for controlling Wind turbines, to inhibit the output power and overcurrent of Wind turbines.The present invention is to existing system grade
The improvement of control method, therefore need not can specially increase hardware realization, so that it may so that flexible direct current power transmission system control is same
Coordinate fault when Shi Shixian normally determines alternating voltage control and failure passes through control.
The technical scheme is that：
Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system of the present invention, includes the following steps：
S1, under normal circumstances, wind farm side transverter are exchanged using alternating voltage control mode, wind farm side transverter is determined
Voltage-controlled reference voltage is set as the first setting value under normal circumstances, and wind power plant busbar voltage is stablized at this time；
S2, wind farm side transverter detect whether that monopole, which occurs, to break down, and S1 is returned if monopole failure does not occur,
Step S3 is then carried out in case of monopole failure；
S3, the current sensing means of non-faulting pole measure non-faulting electrode current value, and by the non-faulting electrode current value with
Scheduled limit value input comparator together：If the non-faulting electrode current value is more than limit value, startup separator is needed to pass through plan
Slightly, step S4 is carried out；If the non-faulting electrode current value is less than or equal to limit value, startup separator does not pass through strategy, returns
Step S1；
S4, the second setting value when the reference voltage is set as breaking down, makes wind power plant bus voltage value drop rapidly
It is low, when the wind power plant busbar voltage of double-fed wind turbine is below the startup threshold value that rotor-side crowbar protects circuit, rotor-side
Crowbar protects circuit start；
S5, after crowbar protects circuit start and is latched the control pulse of insulated gate bipolar transistor IGBT, double-fed
Formula induction machine DFIG is worked in the form of wire-wound asynchronous motor, in not controlling state；When reference voltage is to break down
Two setting values are controlled as initial value by Voltage Feedback, and the new value of reference voltage is calculated, and are changed by wind farm side
The control of stream device is so that the value of wind power plant busbar voltage reaches the new value of the reference voltage；
S6, after wind farm side transverter detects straight-flow system monopole Failure elimination, the reference voltage is reset to normally
In the case of the first setting value, the value of wind power plant busbar voltage rises, protected when the value of wind power plant busbar voltage rises to crowbar
When more than the startup threshold value of protection circuit, crowbar protection circuits exit, while restoring insulated gate bipolar transistor IGBT control
Pulse, and return to step S1.
Preferably, the first setting value of the reference voltage under normal circumstances necessarily is greater than double-feedback aerogenerator
Crowbar protects the startup threshold value of circuit, second setting value of the reference voltage in failure to have to be lower than double-fed type wind-force
The startup threshold value of the crowbar protection circuits of generator.
Preferably, second setting value of the reference voltage in failure and double-fed type induction machine DFIG parameters and failure
Preceding output of wind electric field is related, before the second setting value and failure when determining the failure by system emulation between output of wind electric field
Correspondence so that crowbar protect circuit start after, non-faulting electrode current value just reaches the rated value of electric current.
Preferably, the first setting value of the reference voltage under normal circumstances is 1.0p.u., and the reference voltage is in event
The second range of set value when barrier is 0.65-0.9p.u..
Preferably, the second setting value when reference voltage is to break down in the S5 is anti-by voltage as initial value
Feedback control, is calculated the new value of reference voltage, and make wind power plant busbar voltage by the control of wind farm side transverter
Value reach the new value of the reference voltage, be as follows：
uset=ufault-Δu；
Wherein, usetFor the reference voltage of wind farm side transverter alternating voltage control, UfaultIt is handed over for wind farm side transverter
Second setting value of the voltage-controlled reference voltage when breaking down is flowed, Δ u is voltage variety；
Voltage controller is controlled using PI, and voltage variety is obtained by following formula：
Δ u=Kp(Id-Idn)+Ki∫(Id-Idn) dt,
Wherein, IdFor non-faulting electrode current measured value；IdnFor the rated value of monopolar current, it is determined by device characteristics
Predetermined value；KiFor the integral parameter of PI controllers；KpFor the proportionality coefficient of PI controllers；
By the u of acquisitionsetIt is worth the new value of the reference voltage controlled as wind farm side transverter alternating voltage, passes through wind-powered electricity generation
The control of field side transverter is so that wind power plant busbar voltage reaches the new value of reference voltage.
The beneficial effects of the invention are as follows：
1, the present invention is compared with Traditional control, when a wherein pole for flexible direct current power transmission system is latched because of failure, leads to
Decompression control and the side crowbar protection circuit collective effect reduction outputs of double-fed fan rotor for crossing wind farm side transverter are active
Power inhibits the overcurrent of non-faulting pole, therefore fast response time, and voltage fluctuation is small, smaller to the impact of Wind turbines.
2, the application protects circuit using existing double-fed fan rotor side crowbar, therefore need not additionally install additional logical
Believe equipment and other hardware circuits.
Description of the drawings
Fig. 1 is wind power plant through flexible DC power transmission grid-connected system circuit diagram；
Fig. 2 is step-down coordination control flow chart；
Fig. 3 is the control block diagram of wind farm side transverter.
Specific implementation mode
The application protects circuit using the crowbar inside double-feedback aerogenerator, as wind power plant busbar voltage VwfIt is low
Start crowbar when below the startup threshold value of setting and protect circuit, and locking is double while crowbar protection circuit starts
Present insulated gate bipolar transistor (IGBT, Insulated the Gate Bipolar of the rotor-side transverter of wind turbine
Transistor this characteristic for) controlling pulse, the reference voltage of alternating voltage control is set by wind power station control system, is come
Wind power plant busbar voltage is controlled, is realized when straight-flow system monopole breaks down and non-faulting electrode current sets limit value beyond electric current
When, wind farm side transverter voltage is reduced, realizes that fault traversing controls using crowbar protection circuits.In the present embodiment, wind
Electric field is divided into two states through flexible DC power transmission grid-connected system, and first state is wind power plant through flexible DC power transmission grid-connected system
Under normal circumstances, the second state is failure shape when monopole failure occurs through flexible DC power transmission grid-connected system for wind power plant for work
State is with reference to the accompanying drawings described in detail coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system, specifically
Include the following steps：
S1, under normal circumstances, wind farm side transverter is using alternating voltage control mode is determined, by keeping wind power plant busbar
Voltage VwfStabilization, maintain the normal work of double-fed wind turbine, at this time wind power plant busbar voltage VwfValue be equal to the wind farm side change of current
The reference voltage u of device alternating voltage controlsetSetting value Unormal, and set end voltage is equal to the rated voltage of DFIG, monopole electricity
Flow the rated value I of the measured value and monopolar current of IdnIt is equal.Reference voltage usetThere are two pre-defined values, respectively：Normally
In the case of the first setting value UnormalWith the second setting value U when breaking downfault.By nominal case leeward in the present embodiment
Electric field busbar voltage is set as wind farm side transverter reference voltage base value, then UnormalUsual value 1.0p.u., double-fed type wind
The startup threshold value of power generator crowbar protection circuits has to be lower than the first setting value U under normal circumstancesnormal.It breaks down
When the second setting value UfaultHave to be lower than the startup threshold value of double-feedback aerogenerator crowbar protection circuits.UfaultTool
Body value is related with output of wind electric field before DFIG parameters and failure, specially：After crowbar protects circuit start, non-faulting
Electrode current value just reaches the rated value of electric current, to maximize the transmission capacity of non-faulting pole, can pass through in Practical Project
System emulation determines UfaultCorrespondence between output of wind electric field before failure, to establish stipulations between the two, Ufault
It will not change after setting.
S2, wind farm side transverter detect whether generation monopole failure, S1 are returned to if monopole failure does not occur, such as
Fruit occurs then to carry out step S3.When a wherein pole of the wind power plant through flexible DC power transmission grid-connected system is broken down, break down
Failure pole transverter can be latched, wind farm side transverter can detect whether wind power plant is sent out through flexible DC power transmission grid-connected system
Raw monopole failure, and testing result is sent to non-faulting pole.
The current sensing means of S3, non-faulting pole measure non-faulting electrode current size, and by non-faulting electrode current value and in advance
Fixed limit value input comparator together：If non-faulting electrode current value is more than limit value, startup separator is needed to pass through strategy, therefore
Carry out step S4；If non-faulting electrode current value is less than or equal to limit value, startup separator does not pass through strategy, i.e. wind farm side changes
Alternating voltage control, therefore return to step S1 are determined in stream device maintenance.According to the measured value I of non-faulting electrode current IdWhether beyond setting
Limit value IdthDecide whether change wind farm side transverter control mode, at this time non-faulting electrode current I be exactly in step S1 just
Monopolar current I in the case of often：As the measured value I of non-faulting electrode current IdLess than limit value IdthWhen, return to step S1, and when non-
The measured value I of failure electrode current IdMore than IdthWhen, enter step S4.
S4, by reference voltage usetSecond setting value U of value when being set as breaking downfault, i.e. uset=Ufault, make
Obtain wind power plant busbar voltage VwfValue reduce rapidly, as the wind power plant busbar voltage V of double-fed wind turbinewfIt is protected in rotor-side crowbar
When below the startup threshold value of protection circuit, the turn on thyristors signal of triggering rotor-side crowbar protection circuits, rotor-side
The thyristor signal of crowbar protection circuits is switched to 1 from 0, and rotor-side crowbar protects circuit start.UfaultSpecific value
It is related with output of wind electric field before DFIG parameters and failure, it can determine U by system emulation in Practical ProjectfaultWith wind before failure
Correspondence between electric field output, to establish stipulations between the two, UfaultIt will not change after setting, usually take
It is worth range in 0.65-0.9p.u..
S5, when crowbar protects circuit start and after be latched the control pulse of IGBT, double-fed type induction machine (DFIG) with
Wire-wound asynchronous motor form works, in not controlling state.Since crowbar protects the effect of circuit, the output power of DFIG
It is reduced rapidly, the electric current of non-faulting pole also reduces therewith realizes fault traversing.According to fig. 3, by changing wind farm side transverter
Reference voltage usetValue, can be with regulating wind power field busbar voltage VwfValue, to play the work of regulating wind power field output power
With.This method is controlled by Voltage Feedback and is realized, specially：The reference voltage that wind farm side transverter controls alternating voltage
usetInitial value design be voltage setting value U when breaking downfault.Wind power station control system is changed in real time by calculating later
Reference voltage usetValue, expression formula is such as shown in (1)
uset=ufault-Δu (1)；
Wherein, usetFor the reference voltage of wind farm side transverter alternating voltage control, UfaultIt is handed over for wind farm side transverter
Second setting value of the voltage-controlled reference voltage when breaking down is flowed, Δ u is voltage variety；
Voltage controller controls (proportion adjustment and integral adjustment) using PI, and voltage variety is obtained by following formula：
Δ u=Kp(Id-Idn)+Ki∫(Id-Idn) dt (2),
Wherein, IdFor non-faulting electrode current measured value；IdnFor the rated value of monopolar current, it is determined by device characteristics
Predetermined value；KiFor the integral parameter of PI controllers；KpFor the proportionality coefficient of PI controllers.
By the u of acquisitionsetIt is worth the reference voltage level as new wind farm side transverter, passes through wind farm side transverter
Control is so that wind power plant busbar voltage VwfValue reach wind farm side transverter alternating voltage control reference voltage usetIt is new
Value.
S6, after wind farm side transverter detects straight-flow system monopole fault clearance, the reference electricity of alternating voltage control
Ballast is set as u under normal circumstancessetSetting value Unormal, i.e. uset=Unormal, due to Unormal>Ufault, wind power plant busbar voltage
VwfValue rise, as wind power plant busbar voltage VwfValue rise to crowbar protection circuit startup threshold value more than when,
The thyristor signal of crowbar protection circuits is switched to 0 from 1.When crowbar protection circuital currents, which are reduced to, maintains electric current or less
Thyristor turns off, and crowbar protection circuits exit, while restoring IGBT control pulses, and return to step S1.
Below by taking a specific wind power plant as an example：
In this wind power plant, due to needing busbar voltage to be equal to the rated voltage U of DFIGn, by alternating voltage control
Reference voltage usetSetting value UnormalBe set as 1.0p.u., according to set end voltage with the stipulations of wind power output by failure when exchange
Voltage-controlled reference voltage usetSetting value UfaultIt is set as 0.7p.u..And the startup threshold value of circuit is protected to set crowbar
For 0.9p.u..Setting those skilled in the art of these concrete numerical values can be configured according to the actual conditions of wind park.
Under normal circumstances, wind power station control system setting wind farm side transverter, will using alternating voltage control mode is determined
Wind power plant busbar voltage is set as wind farm side transverter reference voltage base value under nominal case, then wind power station control system is set
Determine the reference voltage u of alternating voltage controlset=1.0p.u., wind power plant busbar voltage VwfValue stabilization in 1.0p.u., wind power plant
Output before failure is 1.0p.u..Wind power plant busbar voltage V at this timewfValue be equal to alternating voltage control reference voltage uset's
Setting value Unormal, i.e. Vwf=uset=1.0p.u., set end voltage are equal to the rated voltage of DFIG, and the measured value of monopolar current I
With the rated value I of monopolar currentdnIt is equal.
When wind farm side transverter detects that straight-flow system monopole breaks down and non-faulting electrode current is more prescribed a time limit, wind power plant
The reference voltage u that control system controls alternating voltagesetValue 0.7p.u. is revised as by original 1.0p.u., that is, u is setset
=0.7p.u., wind power plant busbar voltage VwfIt is controlled by wind farm side transverter, also with usetVariation and reduce.When double
Present the wind power plant busbar voltage V of wind turbinewfWhen rotor-side crowbar protects the startup threshold value 0.9p.u. or less of circuit, triggering turns
The thyristor signal of the turn on thyristors signal of sub- side crowbar protections circuit, rotor-side crowbar protection circuits is switched to from 0
1, rotor-side crowbar protects circuit start.
Work as VwfDrop to preset ufaultWhen, the control mode of wind farm side transverter is changed to by determining alternating voltage control
Voltage Feedback controls, and by expression formula (1) and (2), wind farm side transverter is calculated according to the fluctuation of non-faulting electrode current
The new value of the reference voltage of wind farm side transverter under failure so that wind power plant busbar is electric by the control of wind farm side transverter
Press VwfTrack usetVariation.
After wind farm side transverter detects straight-flow system monopole failure removal, wind power station control system, which is reset, to be handed over
Flow voltage-controlled reference voltage uset=1.0p.u. so that wind power plant busbar voltage VwfRise, as wind power plant busbar voltage Vwf
When rising to the startup threshold value of crowbar protection circuits or more, the thyristor signal of crowbar protection circuits is switched to 0 from 1.When
Crowbar protection circuital currents are reduced to thyristor when maintaining electric current or less and turn off, and crowbar protection circuits exit, while extensive
Multiple IGBT controls pulse.Alternating voltage control is determined in the recovery of wind farm side transverter, as wind power plant busbar voltage VwfValue stabilization exist
After 1.0p.u., wind power plant has been then restored to normal condition, realizes wind power plant and occurs through flexible DC power transmission grid-connected system monopole
Fault traversing when failure.
Specific embodiment described herein is only to be given an example to the present invention.The technical field of the invention
Technical staff can make various modifications or additions to the described embodiments or substitute by a similar method, but
Without departing from the spirit of the invention or going beyond the scope defined by the appended claims.
Claims (5)
1. a kind of coordinate fault traversing method of wind power plant through flexible DC power transmission grid-connected system, it is characterised in that：Including as follows
Step：
S1, under normal circumstances, wind farm side transverter, which uses, determines alternating voltage control mode, wind farm side transverter alternating voltage
The reference voltage of control is set as the first setting value under normal circumstances, and wind power plant busbar voltage is stablized at this time；
S2, wind farm side transverter detect whether that monopole, which occurs, to break down, and S1 is returned if monopole failure does not occur, if
Monopole failure occurs and then carries out step S3；
The current sensing means of S3, non-faulting pole measure non-faulting electrode current value, and by the non-faulting electrode current value and make a reservation for
Limit value input comparator together：If the non-faulting electrode current value is more than limit value, startup separator is needed to pass through strategy, into
Row step S4；If the non-faulting electrode current value is less than or equal to limit value, startup separator does not pass through strategy, return to step
S1；
S4, the second setting value when the reference voltage is set as breaking down, makes wind power plant bus voltage value reduce rapidly, when
When the wind power plant busbar voltage of double-fed wind turbine is below the startup threshold value that rotor-side crowbar protects circuit, rotor-side crowbar
Protect circuit start；
S5, after crowbar protects circuit start and is latched the control pulse of insulated gate bipolar transistor IGBT, double-fed type sense
Motor DFIG is answered to work in the form of wire-wound asynchronous motor, in not controlling state；Second when reference voltage is to break down sets
Definite value is controlled as initial value by Voltage Feedback, and the new value of reference voltage is calculated, and passes through wind farm side transverter
Control so that the value of wind power plant busbar voltage reaches the new value of the reference voltage；
S6, after wind farm side transverter detects straight-flow system monopole fault clearance, the reference voltage is reset to normal condition
Under the first setting value, the value of wind power plant busbar voltage rises, when the value of wind power plant busbar voltage rises to crowbar protection electricity
When more than the startup threshold value on road, crowbar protection circuits exit, while restoring insulated gate bipolar transistor IGBT control arteries and veins
Punching, and return to step S1.
2. coordinate fault traversing method of the wind power plant according to claim 1 through flexible DC power transmission grid-connected system, special
Sign is：The first setting value of the reference voltage under normal circumstances necessarily is greater than the crowbar of double-feedback aerogenerator
The startup threshold value of circuit, second setting value of the reference voltage in failure is protected to have to be lower than double-feedback aerogenerator
Crowbar protects the startup threshold value of circuit.
3. coordinate fault traversing method of the wind power plant according to claim 2 through flexible DC power transmission grid-connected system, special
Sign is：
Second setting value of the reference voltage in failure goes out with wind power plant before double-fed type induction machine DFIG parameters and failure
Power is related, and the correspondence before the second setting value and failure when determining failure by system emulation between output of wind electric field makes
After obtaining crowbar protection circuit starts, non-faulting electrode current value just reaches the rated value of electric current.
4. coordinate fault traversing method of the wind power plant according to claim 2 through flexible DC power transmission grid-connected system, special
Sign is：
The first setting value of the reference voltage under normal circumstances be 1.0p.u., the reference voltage in failure second
Range of set value is 0.65-0.9p.u..
5. coordinate fault traversing method of the wind power plant according to claim 1 through flexible DC power transmission grid-connected system, described
The second setting value when reference voltage is to break down in S5 is controlled by Voltage Feedback as initial value, reference is calculated
The new value of voltage, and by the control of wind farm side transverter so that the value of wind power plant busbar voltage reaches the reference voltage
New value, which is characterized in that be as follows：
uset=ufault-Δu；
Wherein, usetFor the reference voltage of wind farm side transverter alternating voltage control, UfaultFor wind farm side transverter alternating current
Second setting value of the reference voltage of voltage-controlled system when breaking down, Δ u are voltage variety；
Voltage controller is controlled using PI, and voltage variety is obtained by following formula：
Δ u=Kp(Id-Idn)+Ki∫(Id-Idn) dt,
Wherein, IdFor non-faulting electrode current measured value；IdnFor the rated value of monopolar current, it is made a reservation for by what device characteristics determined
Value；KiFor the integral parameter of PI controllers；KpFor the proportionality coefficient of PI controllers；
By the u of acquisitionsetIt is worth the new value of the reference voltage controlled as wind farm side transverter alternating voltage, passes through wind farm side
The control of transverter is so that wind power plant busbar voltage reaches the new value of reference voltage.
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