CN108808733A - A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon - Google Patents

A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon Download PDF

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CN108808733A
CN108808733A CN201810722626.1A CN201810722626A CN108808733A CN 108808733 A CN108808733 A CN 108808733A CN 201810722626 A CN201810722626 A CN 201810722626A CN 108808733 A CN108808733 A CN 108808733A
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electromagnetic torque
value
mouse
type wind
cage type
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CN108808733B (en
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尹俊
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North China University of Water Resources and Electric Power
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    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Wind Motors (AREA)

Abstract

A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon, the method is the electromagnetic torque adjust automatically control method controlled by the voltage of voltage control loop in the reactive power compensator to mouse-cage type wind-driven generator, the method includes：Rotor current, which is obtained, by the current transformer measurement on mouse-cage type wind power generator rotor calculates electromagnetic torque；Linear extrapolation is carried out to electromagnetic torque, calculate the average rate of change of electromagnetic torque, pass through controlling electromagnetic torque value, calculate the voltage controling value of reactive power compensator voltage control loop, turn on thyristors angle in reactive power compensator is further calculated, the electromagnetic torque overshoot phenomenon during mouse-cage type wind-driven generator fault recovery is eliminated in the conducting by controlling thyristor.By being based on the improved electromagnetic torque adjust automatically control method of linear prediction, the electromagnetic torque overshoot phenomenon of mouse-cage type wind-driven generator in failover procedure is eliminated.

Description

A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon
Technical field
The invention belongs to control technology on wind electricity generation unit fields, are related to a kind of with reactive power compensator (STATCOM) Mouse-cage type wind-driven generator the control method of electromagnetic torque overshoot phenomenon is eliminated in failover procedure, and in particular to it is a kind of Eliminate the control method of mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon.
Background technology
Research now concerning the controlling electromagnetic torque of (double-fed, permanent magnetism) variable speed model wind-driven generator is very much.But The research of the controlling electromagnetic torque of the present mouse-cage type wind-driven generator in relation to constant speed type is also seldom.In installed wind power plant Wind-driven generator is largely mouse-cage type wind-driven generator.Therefore, it is necessary to study the electromagnetic torques of mouse-cage type wind-driven generator Control method, to reduce the impact force when electromagnetic torque increases suddenly in transmission system suffered by mechanical part.Mouse-cage type wind Power generator is directly connected to power grid, and centre is without any current transformer, therefore, is easy to be influenced by power grid.When power grid is sent out When raw failure, the voltage and frequency of power grid can all influence the electromagnetic torque of mouse-cage type wind-driven generator.Moreover, because mouse-cage type The electromagnetic torque of wind-driven generator is the function of rotor current, and rotor current is directly proportional to terminal voltage, so working as power grid When failure, since set end voltage fluctuates, larger fluctuation, or even production will also occur for the electromagnetic torque in mouse-cage type wind-driven generator Raw electromagnetic torque overshoot phenomenon.
In addition, being influenced by the mutation of moment electromagnetic torque, the sensing unit of the transmission systems such as gearbox will be by very big Mechanical impact force.The torque overload of the gearbox of generation will damage transmission gear, and the service life of gearbox is caused to decline. Especially when an error occurs, when the electromagnetic torque of mouse-cage type wind-driven generator increases above rated value, gear-box will be damaged.And The degree of damage depend on electromagnetic torque overrate number and duration of overload length.In mouse-cage type wind-power electricity generation Machine generator terminal installation reactive power compensator (STATCOM) can effectively compensate for falling for set end voltage, make the variation of electromagnetic torque Cheng Gengjia is steady, can also significantly reduce the fatigue of gearbox in this way, to extend its service life.Therefore, many mouse-cage type wind Power generator is mounted with STATCOM in generator terminal, to realize the control of electromagnetic torque.
The common control control method of mouse-cage type wind-driven generator of installation STATCOM now, is injected most during failure Big reactive current.Although increasing transient stability margin and low voltage ride-through capability in this way, also produces larger electromagnetism and turn Square, in some instances it may even be possible to lead to electromagnetic torque overshoot phenomenon.
Invention content
To solve the above problems, providing a kind of control method for eliminating mouse cage generator electromagnetic torque overshoot phenomenon, needle The controlling party of electromagnetic torque overshoot phenomenon is eliminated in failure process to the mouse-cage type wind-driven generator with reactive power compensator Method.
The purpose of the present invention is what is realized in the following manner：
A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon, the method is by mouse The electromagnetic torque adjust automatically control that the voltage of voltage control loop is controlled in the reactive power compensator of cage modle wind-driven generator Method processed, the method includes：
Step 1：Rotor current Id is obtained by the current transformer measurement on mouse-cage type wind power generator rotor Calculate electromagnetic torque τem；
Step 2：To electromagnetic torque τemLinear extrapolation is carried out, the average rate of change r of electromagnetic torque is calculated, based on linear outer Push away the electromagnetic torque value τ for calculating following time intervalem(t0+Tpred)；Assuming that current time is t0, TpredFor electromagnetic torque Time of measuring interval；
Step 3：Using the specified electromagnetic torque value of system as setting valve, by the electromagnetic torque of following time interval with adjust Electromagnetic torque compared with being limited in maximum, minimum clipping range, export controlling electromagnetic torque value τ by maximum, the minimum limit ratio of valueC；
Step 4：Pass through controlling electromagnetic torque value τC, the voltage controling value of reactive power compensator voltage control loop is calculated, Turn on thyristors angle in reactive power compensator is further calculated, mouse-cage type wind-driven generator is eliminated in the conducting by controlling thyristor Electromagnetic torque overshoot phenomenon during fault recovery.
The step 1 the specific steps are：It is surveyed by the current transformer on mouse-cage type wind power generator rotor Measure rotor current Id, by τem=Cm×IdElectromagnetic torque τ is calculatedem, wherein CmFor the torque of mouse-cage type wind-driven generator Coefficient；
The step 2 the specific steps are：According to electromagnetic torque τemAnd τemVariation tendency to electromagnetic torque τemIt carries out Linear extrapolation calculates the average rate of change r of electromagnetic torque, it is assumed that current time t0, then the calculation formula of average rate of change r ForWherein, τem(t0) it is t0The electromagnetic torque at moment, τem(t0-Tpred) it is upper time of measuring interval The electromagnetic torque measured, TpredFor the time of measuring interval of electromagnetic torque；
It is calculated based on linear extrapolation according to the average rate of change r of calculated electromagnetic torque and the electromagnetic torque at current time Go out the electromagnetic torque value τ of following time intervalem(t0+Tpred), τem(t0+Tpred)=τem(t0)+rTpred。
The step 3 the specific steps are：
It is right using the electromagnetic torque of calculated following time interval as the instantaneous value of the electromagnetic torque of following time interval Electromagnetic torque during generator failure is restored is controlled in advance, to the sensitivity of controlling electromagnetic torque and reduction in increase system Response time, and using the specified electromagnetic torque value of system as setting valve, and by specified turn of 1.2 times of setting valve and 0.8 times Square is set as the maximum of electromagnetic torque, minimum amplitude limit, by the real-time electromagnetic torque of calculated next time interval with adjust The minimax amplitude limit of value is compared, and is limited in maximum, minimum clipping range to controlling electromagnetic torque, will control it Controlling electromagnetic torque value τ afterwardsCIt is calculated,Wherein m is for repairing The proportionality factor of electromagnetic torque, τ are just being measured in real timeem(t0+Tpred) it is based on the calculated following time interval of linear extrapolation Electromagnetic torque value；If τem(t0+Tpred) it is more than maximum amplitude limit τmaxWhen, i.e., the electromagnetic torque value of following time interval is more than most It, will be always to the electromagnetic torque value τ of following time interval when big amplitude limitem(t0+Tpred) through being multiplied by n times (1-m) coefficient until It is limited within maximum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is less than minimum amplitude limit τmin When, it can be always to the electromagnetic torque value τ of following time intervalem(t0+Tpred) by being multiplied by n times (1+m) coefficient until its limitation Within more than minimum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is more than minimum amplitude limit τminAnd Less than maximum amplitude limit τmaxWhen, export electromagnetic torque value controlling value τCEqual to the electromagnetic torque value τ of following time intervalem(t0+ Tpred)。
The step 4 the specific steps are：
Electromagnetic torque value controlling value τ is calculatedCLater, further pass through the relational expression of electromagnetic torque and voltageCalculate the voltage controling value V of reactive power compensator voltage control loopdef；Wherein τCTurn for electromagnetism Square value controlling value, α are electric machine structure constant, and s is revolutional slip, and R, X are mouse-cage type wind-driven generator resistance, leakage reactance；
Pass through voltage controling value VdefThe conduction angle of thyristor in reactive power compensator is calculated,Wherein VmFor thyristor rated voltage；M is conducting voltage pulse number, and the value of m takes thyristor control The switching frequency of system；
Conducting by controlling thyristor makes the output voltage of reactive power compensator be equal to voltage controling value Vdef；It is electric at this time Magnetic torque is limited in maximum, irreducible minimum amplitude range, and the electromagnetism during eliminating mouse-cage type wind-driven generator fault recovery turns Square overshoot phenomenon.
Beneficial effects of the present invention：Increase a control by the reactive power compensator to mouse-cage type wind-driven generator generator terminal Link eliminates mouse-cage type in failover procedure by being based on the improved electromagnetic torque adjust automatically control method of linear prediction The electromagnetic torque overshoot phenomenon of wind-driven generator.
Description of the drawings
Fig. 1 is the flow signal provided by the present invention for eliminating mouse cage generator electromagnetic torque overshoot phenomenon control method Figure.
Fig. 2 is the controlling electromagnetic torque approach application of the present invention in reactive power compensator voltage control loop schematic diagram；
Fig. 3 is the speed diagram of mouse-cage type wind-driven generator；
Fig. 4 is the electromagnetic torque τ em variation diagrams of mouse-cage type wind-driven generator；
Specific implementation mode
A kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon, the method is by mouse The electromagnetic torque adjust automatically control that the voltage of the reactive power compensator voltage control loop of cage modle wind-driven generator is controlled Method, the method includes：
Rotor current I is obtained by the current transformer measurement on mouse-cage type wind power generator rotord, by τem= Cm×IdElectromagnetic torque τ is calculatedem, wherein CmFor the moment coefficient of mouse-cage type wind-driven generator；
According to electromagnetic torque τemAnd τemVariation tendency to electromagnetic torque τemLinear extrapolation is carried out, electromagnetism is calculated and turns The average rate of change r of square, it is assumed that current time t0, then the calculation formula of average rate of change r be Wherein, τem(t0) it is t0The electromagnetic torque value at moment, τem(t0-Tpred) it is the electromagnetic torque that upper time of measuring interval measurement arrives Measured value, TpredFor the time of measuring interval of electromagnetic torque；
It is calculated based on linear extrapolation according to the average rate of change r of calculated electromagnetic torque and the electromagnetic torque at current time Go out the electromagnetic torque value τ of following time intervalem(t0+Tpred), τem(t0+Tpred)=τem(t0)+rTpred；
It is right using the electromagnetic torque of calculated following time interval as the instantaneous value of the electromagnetic torque of following time interval Electromagnetic torque during generator failure is restored is controlled in advance, to the sensitivity of controlling electromagnetic torque and reduction in increase system Response time, and using the specified electromagnetic torque value of system as setting valve, and by specified turn of 1.2 times of setting valve and 0.8 times Square is set as the maximum of electromagnetic torque, minimum amplitude limit, by the real-time electromagnetic torque of calculated next time interval with adjust The minimax amplitude limit of value is compared, and is limited in maximum, minimum clipping range to controlling electromagnetic torque, will control it Controlling electromagnetic torque value τ afterwardsCIt is calculated,Wherein m is for repairing The proportionality factor of electromagnetic torque, τ are just being measured in real timeem(t0+Tpred) it is based on the calculated following time interval of linear extrapolation Electromagnetic torque value；If τem(t0+Tpred) it is more than maximum amplitude limit τmaxWhen, i.e., the electromagnetic torque value of following time interval is more than most It, will be always to the electromagnetic torque value τ of following time interval when big amplitude limitem(t0+Tpred) through being multiplied by n times (1-m) coefficient until It is limited within maximum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is less than minimum amplitude limit τmin When, always to the electromagnetic torque value τ of following time intervalem(t0+Tpred) by being multiplied by n times (1+m) coefficient until it is limited in Within minimum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is more than minimum amplitude limit τminAnd it is small In maximum amplitude limit τmaxWhen, export electromagnetic torque value controlling value τCEqual to the electromagnetic torque value τ of following time intervalem(t0+Tpred)；
Electromagnetic torque value controlling value τ is calculatedCLater, further pass through the relational expression of electromagnetic torque and voltageCalculate the voltage controling value V of reactive power compensator voltage control loopdef；Wherein τCFor electromagnetic torque It is worth controlling value, α is electric machine structure constant, and s is revolutional slip, and R, X are mouse-cage type wind-driven generator resistance, leakage reactance；
Pass through voltage controling value VdefThe conduction angle of thyristor in reactive power compensator is calculated,Wherein VmFor thyristor rated voltage；M is conducting voltage pulse number, and the value of m takes thyristor control The switching frequency of system；
As shown in Fig. 2, making the output voltage of reactive power compensator be equal to voltage controling value by controlling the conducting of thyristor Vdef；Electromagnetic torque is limited in maximum, irreducible minimum amplitude range at this time, eliminates the mouse-cage type wind-driven generator fault recovery phase Between electromagnetic torque overshoot phenomenon.
The validity of this patent institute extracting method, the artificial circuit such as Fig. 2 are demonstrated using power system simulation software PSCAD It is shown.At 3 seconds, three-phase shortcircuit occurred for mouse-cage type wind-driven generator generator terminal, continues 350 milliseconds.The base carried using this patent In the improvement ETSPAA control methods of linear prediction, the electromagnetic torque during mouse-cage type wind-driven generator failure is controlled, Fig. 3 is mouse The speed diagram of cage modle wind-driven generator.
Fig. 4 is the electromagnetic torque τ of mouse-cage type wind-driven generatoremVariation diagram.It can be seen that before the failure, electromagnetic torque is Rated value.During failure occurs, since the set end voltage of generator will be zero, electromagnetic torque is also reduced to zero at this time.Failure After removing, the value of electromagnetic torque fast transient, electromagnetic torque can be rapidly achieved maximum amplitude limit 1.2pu.When voltage be restored to it is specified When value, τem1.2pu is kept to terminate until rotating speed is restored to the i.e. entire recovery process of rated speed, electromagnetic torque just returns to volume later Definite value.Therefore, the method that this patent is carried can allow electromagnetic torque to be no more than the maximum amplitude limit of 1.2pu, to effectively eliminate Electromagnetic torque overshoot phenomenon during mouse-cage type wind-driven generator fault recovery.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art, Under the premise of not departing from general idea of the present invention, several changes and improvements can also be made, these should also be considered as the present invention's Protection domain.

Claims (5)

1. a kind of control method for eliminating mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon, it is characterised in that：The method It is the electromagnetic torque controlled by the voltage of voltage control loop in the reactive power compensator to mouse-cage type wind-driven generator Adjust automatically control method, the method includes：
Step 1：Rotor current Id is obtained by the current transformer measurement on mouse-cage type wind power generator rotor to calculate Electromagnetic torque τem；
Step 2：To electromagnetic torque τemLinear extrapolation is carried out, the average rate of change r of electromagnetic torque is calculated, is based on linear extrapolation meter Calculate the electromagnetic torque value τ of following time intervalem(t0+Tpred)；Assuming that current time is t0, TpredFor the measurement of electromagnetic torque Time interval；
Step 3：Using the specified electromagnetic torque value of system as setting valve, most with setting valve by the electromagnetic torque of following time interval Greatly, electromagnetic torque compared with being limited in maximum, minimum clipping range, export controlling electromagnetic torque value τ by minimum limit ratioC；
Step 4：Pass through controlling electromagnetic torque value τC, the voltage controling value of reactive power compensator voltage control loop is calculated, further Turn on thyristors angle in reactive power compensator is calculated, it is extensive that mouse-cage type wind-driven generator failure is eliminated in the conducting by controlling thyristor Electromagnetic torque overshoot phenomenon during multiple.
2. the control method of mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon as described in claim 1, it is characterised in that： The step 1 the specific steps are：Turned by the current transformer measurement on mouse-cage type wind power generator rotor Electron current Id, by τem=Cm×IdElectromagnetic torque τ is calculatedem, wherein CmFor the moment coefficient of mouse-cage type wind-driven generator.
3. the control method of mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon as described in claim 1, it is characterised in that： The step 2 the specific steps are：According to electromagnetic torque τemAnd τemVariation tendency to electromagnetic torque τemIt carries out linear outer It pushes away, calculates the average rate of change r of electromagnetic torque, it is assumed that current time t0, then the calculation formula of average rate of change r beWherein, τem(t0) it is t0The electromagnetic torque at moment, τem(t0-Tpred) it is that upper time of measuring interval is surveyed The electromagnetic torque measured, TpredFor the time of measuring interval of electromagnetic torque；
It is calculated down based on linear extrapolation according to the average rate of change r of calculated electromagnetic torque and the electromagnetic torque at current time The electromagnetic torque value τ of one time intervalem(t0+Tpred), τem(t0+Tpred)=τem(t0)+rTpred。
4. the control method of mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon as described in claim 1, it is characterised in that： The step 3 the specific steps are：
Using the electromagnetic torque of calculated following time interval as the instantaneous value of the electromagnetic torque of following time interval, to power generation Electromagnetic torque in machine fault recovery is controlled in advance, and to the sensitivity of controlling electromagnetic torque and response is reduced in increase system Time, and the specified electromagnetic torque value of system is set as setting valve, and by the nominal torque of 1.2 times of setting valve and 0.8 times It is set to the maximum of electromagnetic torque, minimum amplitude limit, by the real-time electromagnetic torque of calculated next time interval and setting valve Minimax amplitude limit is compared, and is limited in maximum, minimum clipping range to controlling electromagnetic torque, after control Controlling electromagnetic torque value τCIt is calculated,Wherein m is for correcting in real time Measure the proportionality factor of electromagnetic torque, τem(t0+Tpred) it is that the electromagnetism based on the calculated following time interval of linear extrapolation turns Square value；If τem(t0+Tpred) it is more than maximum amplitude limit τmaxWhen, i.e., the electromagnetic torque value of following time interval is more than maximum amplitude limit When, it will be always to the electromagnetic torque value τ of following time intervalem(t0+Tpred) by being multiplied by n times (1-m) coefficient until its limitation Within maximum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is less than minimum amplitude limit τminWhen, meeting Always to the electromagnetic torque value τ of following time intervalem(t0+Tpred) by being multiplied by n times (1+m) coefficient until it is limited in and is more than Within minimum amplitude limit, just electromagnetic torque value controlling value τCOutput；If τem(t0+Tpred) it is more than minimum amplitude limit τminAnd less than most Big amplitude limit τmaxWhen, export electromagnetic torque value controlling value τCEqual to the electromagnetic torque value τ of following time intervalem(t0+Tpred)。
5. the control method of mouse-cage type wind-driven generator electromagnetic torque overshoot phenomenon as described in claim 1, it is characterised in that： The step 4 the specific steps are：
Electromagnetic torque value controlling value τ is calculatedCLater, further pass through the relational expression of electromagnetic torque and voltageCalculate the voltage controling value V of reactive power compensator voltage control loopdef；Wherein τCFor electromagnetic torque It is worth controlling value, α is electric machine structure constant, and s is revolutional slip, and R, X are mouse-cage type wind-driven generator resistance, leakage reactance；
Pass through voltage controling value VdefThe conduction angle of thyristor in reactive power compensator is calculated,Its Middle VmFor thyristor rated voltage；M is conducting voltage pulse number, and the value of m takes the switching frequency of thyristor control system；
The conducting of control thyristor makes the output voltage of reactive power compensator be equal to voltage controling value Vdef；Electromagnetic torque limits at this time It is scheduled in maximum, irreducible minimum amplitude range, the electromagnetic torque overshoot during eliminating mouse-cage type wind-driven generator fault recovery is existing As.
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