CN103701378B - A kind of output power control method for wind driven generator - Google Patents

Abstract

The invention belongs to wind driven generator output power and control technical field, disclose a kind of output power control method for wind driven generator.This output power control method for wind driven generator, including: the rotating speed of wind-driven generator is periodically sampled, in each rotating speed sampling period, the tachometer value obtained according to sampling, by the torque value that the rotational speed and torque curve acquisition of wind-driven generator is corresponding, and draw wind-driven generator output within the corresponding rotating speed sampling period；During the rotating speed of wind-driven generator is periodically sampled, in each rotating speed sampling period after the starting stage, draw the arithmetic mean of instantaneous value of wind-driven generator output within front n the rotating speed sampling period, then according to the wind-driven generator arithmetic mean of instantaneous value of output within front n the rotating speed sampling period and the rated power of wind-driven generator, the output torque of wind-driven generator is controlled.

Description

A kind of output power control method for wind driven generator

Technical field

The invention belongs to wind driven generator output power and control technical field, particularly to a kind of wind-driven generator output work Rate control method.

Background technology

For wind-driven generator, when wind speed rapidly increases to higher than rated wind speed, now rotating speed can quickly raise, Conventional output power scheme is: the torque of wind-driven generator maintains essentially in nominal torque；Pitch-controlled system quickly responds With control rotating speed near rated speed, but restricted by pitch rate and change oar time delay, general fan blade in reality Propeller pitch angle rate of change is limited in 4-6 °/s, if wind speed change is very fast, propeller pitch angle rate of change likely occur because limited and Following the tracks of slowly, rotating speed controls to there will be larger fluctuation, even occurs that hypervelocity is shut down.The additionally frequent movement of pitch-controlled system, at leaf Sheet root produces the biggest fatigue load, and then has influence on the service life of blade.

Summary of the invention

It is an object of the invention to propose a kind of output power control method for wind driven generator.The present invention can be with speed faster Degree makes the rotating speed of wind-driven generator revert to the rated speed of wind-driven generator.Ensureing that unit not long-play is at overload shape While state, the action frequency of pitch-controlled system, and then the fatigue load of reduction root of blade can be reduced, increase blade and become oar The service life of bearing.

For realizing above-mentioned technical purpose, the present invention adopts the following technical scheme that and is achieved.

A kind of output power control method for wind driven generator, including: the rotating speed of wind-driven generator is periodically adopted Sample is in each rotating speed sampling period, according to rotating speed sampled value, corresponding by the rotational speed and torque curve acquisition of wind-driven generator Torque value, rotating speed sampled value is multiplied with the torque value of acquisition, show that wind-driven generator is within the corresponding rotating speed sampling period Output；

During periodically sampling the rotating speed of wind-driven generator, the 1st rotating speed sampling period is to the n-th rotating speed Sampling period is the starting stage, and n is the natural number more than 1；In each rotating speed sampling period after the starting stage, obtain air-out The arithmetic mean of instantaneous value of power generator output within front n the rotating speed sampling period, then according to wind-driven generator at front n Defeated to wind-driven generator of the arithmetic mean of instantaneous value of the output in the rotating speed sampling period and the rated power of wind-driven generator Go out torque to be controlled.

The feature of the present invention and further improvement is that:

The rated power of described wind-driven generator is P_Specified, in the 1st rotating speed sampling period, by wind-driven generator at the 1st turn The output P in speed sampling period₁Divided by n, obtain the design of wind-driven generator output within the 1st rotating speed sampling period Meansigma methodsThen according to P₁With P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, drew for the 1st rotating speed sampling period The torque set-point T of wind-driven generator₁；The torque set-point T of the wind-driven generator according to the 1st rotating speed sampling period₁To wind-force The output torque of electromotor is controlled, and by T₁The tachometer value ω recorded with the 1st rotating speed sampling period₁It is multiplied, obtains the 2nd turn The reference power P of the wind-driven generator in speed sampling period₂'；

In the i-th rotating speed sampling period, wind-driven generator output within i the rotating speed sampling period set is asked With, i takes 2 to n, and i the rotating speed sampling period of described setting refers to that the 1st rotating speed sampling period is to the i-th rotating speed sampling period；Will summation The result of computing, divided by n, obtains the design meansigma methods of wind-driven generator output within i the rotating speed sampling period setThen according to P_i' and P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, draw the wind-force in the i-th rotating speed sampling period The torque set-point T of electromotor_i；The torque set-point T of the wind-driven generator according to the i-th rotating speed sampling period_iTo wind-driven generator Output torque be controlled, and by T_iThe tachometer value ω recorded with the i-th rotating speed sampling period_iIt is multiplied, obtains i+1 rotating speed and adopt The reference power P of the wind-driven generator in sample cycle_i+1'；

In the jth rotating speed sampling period, wind-driven generator output within n the rotating speed sampling period set is asked With, j takes the natural number more than n, and n the rotating speed sampling period of described setting refers to that the jth-n+1 rotating speed sampling period adopts to jth rotating speed The sample cycle；By the result of summation operation divided by n, obtain wind-driven generator output work within n the rotating speed sampling period set The arithmetic mean of instantaneous value of rateThen according to P_j' and P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, show that jth turns The torque set-point T of the wind-driven generator in speed sampling period_j；The torque of the wind-driven generator according to the jth rotating speed sampling period is given Definite value T_jOutput torque to wind-driven generator is controlled, and by T_jThe tachometer value ω recorded with the jth rotating speed sampling period_jPhase Take advantage of, obtain the reference power P of the wind-driven generator in jth+1 rotating speed sampling period_j+1'。

In the 1st rotating speed sampling period, obtaining setting of wind-driven generator output within the 1st rotating speed sampling period Meter meansigma methodsAfterwards, the 1st torque modification coefficient d T is determined according to below equation₁:

dT₁=dT₁'×k₁

dT₁' take 1, whenTime, k₁=1；WhenAnd P₁>P_SpecifiedTime, k₁∈ [0.995,1)；WhenAnd P₁=P_SpecifiedTime, k₁∈(1,1.005]；WhenAnd P₁>P_SpecifiedTime, k₁∈(1,1.005]；WhenOr P₁ <P_SpecifiedTime, k₁∈(1,1.005]；

Determining the 1st torque modification coefficient d T₁Afterwards, the 2nd torque modification coefficient intermediate value dT is determined₂' adopt with the 1st rotating speed The torque set-point T of the wind-driven generator in sample cycle₁, dT₂'=dT₁, T₁=dT₁×T_e, T_e=1.05T_Specified, T_SpecifiedFor wind-driven generator Nominal torque；It is then determined that the reference power P of the wind-driven generator in the 2nd rotating speed sampling period₂', P₂'=T₁×ω₁；

In the i-th rotating speed sampling period, obtaining wind-driven generator output work within i the rotating speed sampling period set The design meansigma methods of rateAfterwards, the i-th torque modification coefficient d T is determined according to below equation_i:

dT_i=dT_i'×k_i

WhenTime, k_i=1；WhenAnd P_i'>P_SpecifiedTime, k_i∈ [0.995,1)；WhenAnd P_i'=P_SpecifiedTime, k_i∈(1,1.005]；WhenAnd P_i'>P_SpecifiedTime, k_i∈(1,1.005]；WhenOr P_i'<P_Specified Time, k_i∈(1,1.005]；

Determining the i-th torque modification coefficient d T_iAfterwards, i+1 torque modification coefficient intermediate value dT is determined_i+1' and i-th turn The torque set-point T of the wind-driven generator in speed sampling period_i, dT_i+1'=dT_i, T_i=dT_i×T_e；It is then determined that the sampling of i+1 rotating speed The reference power P of the wind-driven generator in cycle_i+1', P_i+1'=T_i×ω_i；

In the jth rotating speed sampling period, obtaining wind-driven generator output work within n the rotating speed sampling period set The arithmetic mean of instantaneous value of rateAfterwards, jth torque modification coefficient d T is determined according to below equation_j:

dT_j=dT_j'×k_j

WhenTime, k_j=1；WhenAnd P_j'>P_SpecifiedTime, k_j∈ [0.995,1)；When And P_j'=P_SpecifiedTime, k_j∈(1,1.005]；WhenAnd P_j'>P_SpecifiedTime, k_j∈(1,1.005]；WhenOr P_j'< P_SpecifiedTime, k_j∈(1,1.005]；

Determining jth torque modification coefficient d T_jAfterwards, jth+1 torque modification coefficient intermediate value dT is determined_j+1' turn with jth The torque set-point T of the wind-driven generator in speed sampling period_j, dT_j+1'=dT_j, T_j=dT_j×T_e；It is then determined that the sampling of jth+1 rotating speed The reference power P of the wind-driven generator in cycle_j+1', P_j+1'=T_j×ω_j。

In each rotating speed sampling period after the starting stage, by the rated speed of rotating speed sampled value Yu wind-driven generator Make difference operation, obtain rotating speed difference；With described rotating speed difference as foundation, the propeller pitch angle of the blade of wind-driven generator is carried out PID Control；Then the result controlled according to PID, and utilize pitch-controlled system that the propeller pitch angle of the blade of wind-driven generator is controlled.

The torque of wind-driven generator is controlled comprising the following steps by the described torque set-point according to wind-driven generator: Torque set-point according to wind-driven generator, uses Direct Torque Control to control the output torque of wind-driven generator System.

The invention have the benefit that the torque set-point of wind-driven generator can effectively be limited by the present invention, The rotating speed of wind-driven generator can be made to revert to the rated speed of wind-driven generator with speed faster again.When ensureing that unit is the longest Between operate in overload while, can reduce the action frequency of pitch-controlled system, and then reduce the fatigue load of root of blade, Increase blade and the service life of pitch variable bearings.

Accompanying drawing explanation

Fig. 1 is the close loop control circuit schematic diagram of a kind of output power control method for wind driven generator of the present invention；

Fig. 2 is the acquisition process schematic diagram of the wind-driven generator of present invention torque set-point after the starting stage；

Fig. 3 is the rotating speed time graph schematic diagram of turbulent wind；

Fig. 4 is wind driven generator output power curve contrast schematic diagram under two kinds of control methods；

Fig. 5 is wind-driven generator speed curves contrast schematic diagram under two kinds of control methods；

Fig. 6 is that wind-driven generator exports torque curve contrast schematic diagram under two kinds of control methods；

Fig. 7 is rotor blade pitch angular curve contrast schematic diagram under two kinds of control methods；

Fig. 8 is rotor blade pitch angular curve local contrast schematic diagram under two kinds of control methods.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings:

With reference to Fig. 1, for the close loop control circuit schematic diagram of a kind of output power control method for wind driven generator of the present invention. This output power control method for wind driven generator includes wind driven generator torque control method and the control at rotor blade pitch angle Method.Wherein, wind driven generator torque control method includes periodically sampling the rotating speed of wind-driven generator.The present invention In embodiment, the rotating speed sampling period of wind-driven generator is 0.02s.With the rotating speed obtained of sampling as foundation, the wind-force of the present invention Generator torque control method may be made that quickly response.

In each sampling period, according to rotating speed sampled value, and by the rotational speed and torque curve acquisition of wind-driven generator Corresponding torque value, the rotational speed and torque curve of wind-driven generator is known quantity, is generally provided by the manufacturer of wind-driven generator. Then rotating speed sampled value is multiplied with the torque value of acquisition, it is possible to calculate wind-driven generator in the corresponding rotating speed sampling period Output in (i.e. this rotating speed sampling period).Such as, in some rotating speed sampling period, rotating speed sampled value is a；At wind-force In the rotational speed and torque curve of electromotor, the torque value corresponding with a is b, then defeated in this rotating speed sampling period of wind-driven generator Going out power is a*b.

The rated power of wind-driven generator is P_Specified(being provided by the manufacturer of wind-driven generator), when wind-driven generator starts After, in the 1st rotating speed sampling period, calculate the wind-driven generator output work in the 1st rotating speed sampling period as procedure described above Rate P₁, then calculate the design meansigma methods of wind-driven generator output within the 1st rotating speed sampling period

${\stackrel{\&OverBar;}{P}}_1=\frac{P_1}{n}$

Wherein, n is the natural number more than 1, and such as, n takes 3 to 7.Then drew for the 1st rotating speed sampling week according to below equation The torque set-point T of the wind-driven generator of phase₁:

T₁=dT₁×T_e

dT₁=dT₁'×k₁

T_e=1.05T_Specified

dT₁' it is the 1st torque modification coefficient intermediate value, dT₁' take 1, T_SpecifiedFor the nominal torque of wind-driven generator (generally by wind The manufacturer of power generator provides).WhenTime, k₁=1；WhenAnd P₁>P_SpecifiedTime, k₁=0.999；WhenAnd P₁=P_SpecifiedTime, k₁=1.005；WhenAnd P₁>P_SpecifiedTime, k₁=1.005；WhenOr P₁<P_SpecifiedTime, k₁=1.005。

Then, according to the torque set-point T of the wind-driven generator in the 1st rotating speed sampling period₁Output to wind-driven generator Torque is controlled (for example with Direct Torque Control).

Determining the 1st torque modification coefficient d T₁Afterwards, the 2nd torque modification coefficient intermediate value is calculated according to below equation dT₂':

dT₂'=dT₁

Calculate the reference power P of the wind-driven generator in the 2nd rotating speed sampling period₂':

P₂'=T₁×ω₁。

ω₁It it is the rotating speed recorded in the 1st rotating speed sampling period.

In the i-th rotating speed sampling period, wind-driven generator output within i the rotating speed sampling period set is asked With, i takes 2 to n, and i the rotating speed sampling period of above-mentioned setting refers to that the 1st rotating speed sampling period is to the i-th rotating speed sampling period.Will summation The result of computing, divided by n, obtains the design meansigma methods of wind-driven generator output within i the rotating speed sampling period setIt is to say,Can be obtained by following computing formula:

${\stackrel{\&OverBar;}{P}}_i=\frac{\underset{k=1}{\overset{i}{\mathrm{\&Sigma;}}}{P}_k}{n}$

P_kFor wind-driven generator at the output in kth rotating speed sampling period.Then, calculated for the i-th rotating speed sampling period The torque set-point T of wind-driven generator_i:

T_i=dT_i×T_e

dT_i=dT_i'×k_i

T_e=1.05T_Specified

dT_i' it is the i-th torque modification coefficient intermediate value, whenTime, k_i=1；WhenAnd P_i'>P_Specified Time, k_i=0.999；WhenAnd P_i'=P_SpecifiedTime, k_i=1.005；WhenAnd P_i'>P_SpecifiedTime, k_i=1.005；WhenOr P_i'<P_SpecifiedTime, k_i=1.005。

Now, according to the torque set-point T of the wind-driven generator in the i-th rotating speed sampling period_iOutput to wind-driven generator Torque is controlled (for example with Direct Torque Control).

Determining the i-th torque modification coefficient d T_iAfterwards, i+1 torque modification coefficient intermediate value is calculated according to below equation dT_i+1':

dT_i+1'=dT_i

Then the reference power P of the wind-driven generator in i+1 rotating speed sampling period is calculated_i+1':

P_i+1'=T_i×ω_i。

ω_iIt it is the rotating speed recorded in the i-th rotating speed sampling period.

The control method that wind-driven generator in i-th rotating speed sampling period exports torque below is illustrated:

As n=5 and i=2, in the 2nd rotating speed sampling period, wind-driven generator is within 2 the rotating speed sampling periods set The design meansigma methods of outputFor:

${\stackrel{\&OverBar;}{P}}_2=\frac{\underset{k=1}{\overset{2}{\mathrm{\&Sigma;}}}{P}_k}{5}$

Now, dT₂' and P₂' for known quantity, according to above-mentioned computational methods, the wind-driven generator in the 2nd rotating speed sampling period Torque set-point T₂Just can calculate.At this time it is also possible to calculate the 3rd torque modification coefficient intermediate value dT₃' and the 3rd turn The reference power P of the wind-driven generator in speed sampling period₃'。

As n=5 and i=5, in the 5th rotating speed sampling period, wind-driven generator is within 5 the rotating speed sampling periods set The design meansigma methods of outputFor:

${\stackrel{\&OverBar;}{P}}_5=\frac{\underset{k=1}{\overset{5}{\mathrm{\&Sigma;}}}{P}_k}{5}$

Now, dT₅' and P₅' for known quantity, according to above-mentioned computational methods, the wind-driven generator in the 5th rotating speed sampling period Torque set-point T₅Just can calculate.At this time it is also possible to calculate the 6th torque modification coefficient intermediate value dT₆' and the 6th turn The reference power P of the wind-driven generator in speed sampling period₆'。

1st rotating speed sampling period was the starting stage to the n-th rotating speed sampling period.With reference to Fig. 2, for the wind-power electricity generation of the present invention The acquisition process schematic diagram of machine torque set-point after the starting stage.After the starting stage, in the jth rotating speed sampling period In, by wind-driven generator output summation within n the rotating speed sampling period set, j takes the natural number more than n, described N the rotating speed sampling period set refers to that the jth-n+1 rotating speed sampling period is to the jth rotating speed sampling period；By the result of summation operation Divided by n, obtain the arithmetic mean of instantaneous value of wind-driven generator output within j the rotating speed sampling period setNamely Say,Can be obtained by following computing formula:

${\stackrel{\&OverBar;}{P}}_j=\frac{\underset{m=j-n+1}{\overset{j}{\mathrm{\&Sigma;}}}{P}_m}{n}$

P_mFor wind-driven generator at the output in m rotating speed sampling period.Then, the jth rotating speed sampling period is calculated The torque set-point T of wind-driven generator_j:

T_j=dT_j×T_e

dT_j=dT_j'×k_j

T_e=1.05T_Specified

dT_j' for jth torque modification coefficient intermediate value, whenTime, k_j=1；WhenAnd P_j'>P_Specified Time, k_j=0.999；WhenAnd P_j'=P_SpecifiedTime, k_j=1.005；WhenAnd P_j'>P_SpecifiedTime, k_j=1.005；WhenOr P_j'<P_SpecifiedTime, k_j=1.005。

Now, according to the torque set-point T of the wind-driven generator in jth rotating speed sampling period_jOutput to wind-driven generator Torque is controlled (for example with Direct Torque Control).

Determining jth torque modification coefficient d T_jAfterwards, jth+1 torque modification coefficient intermediate value is calculated according to below equation dT_j+1':

dT_j+1'=dT_j

Then the reference power P of the wind-driven generator in jth+1 rotating speed sampling period is calculated_j+1':

P_j+1'=T_j×ω_j。

ω_jThe rotating speed recorded for the jth rotating speed sampling period.

The control method that wind-driven generator in the jth rotating speed sampling period exports torque below is illustrated:

As n=5 and j=6, j-n+1=2；In the 6th rotating speed sampling period, wind-driven generator is adopted at 6 rotating speeds set The arithmetic mean of instantaneous value of the output in the sample cycleFor:

${\stackrel{\&OverBar;}{P}}_6=\frac{\underset{m=2}{\overset{6}{\mathrm{\&Sigma;}}}{P}_m}{5}$

Now, dT₆' and P₆' for known quantity, according to above-mentioned computational methods, the wind-driven generator in the 6th rotating speed sampling period Torque set-point T₆Just can calculate.At this time it is also possible to calculate the 7th torque modification coefficient intermediate value dT₇' and the 7th turn The reference power P of the wind-driven generator in speed sampling period₇'。

In conjunction with Fig. 1, the control method at the rotor blade pitch angle of the present invention includes procedure below: after the starting stage In each rotating speed sampling period, the rated speed of rotating speed sampled value Yu wind-driven generator is made difference operation, obtain rotating speed difference；With Described rotating speed difference is foundation, and the propeller pitch angle of the blade of wind-driven generator is carried out PID control (now, in addition it is also necessary to by blade Propeller pitch angle is limited between 0 degree to 90 degree)；Then the result (i.e. the set-point of the propeller pitch angle of blade) controlled according to PID, and profit With pitch-controlled system, the propeller pitch angle of the blade of wind-driven generator is controlled.

With a specific embodiment, a kind of output power control method for wind driven generator of the present invention is illustrated below, In this specific embodiment, external wind is turbulent wind.With reference to Fig. 3, for the speed curves schematic diagram of turbulent wind.Horizontal stroke in Fig. 3 Axle is the time, and the longitudinal axis is the rotating speed of outside turbulent wind.

In this specific embodiment, using two kinds of methods to be controlled wind driven generator output power, one is tradition Control methods of tabling look-up (by rotational speed and torque curve produce wind-driven generator torque set-point), another is the wind of the present invention Power generator output power control method.With reference to Fig. 4, for right under two kinds of control methods of wind driven generator output power curve Compare schematic diagram.In conjunction with Fig. 3, when wind speed rapid increase, the output power control method for wind driven generator of the present invention can make wind Power generator output is quickly returned to the rated power (2MW) of wind-driven generator.

With reference to Fig. 5, for wind-driven generator speed curves contrast schematic diagram under two kinds of control methods.Wherein, vertical in Fig. 5 The unit of coordinate is for turning every point (rpm).From figure 5 it can be seen that compared with control methods of tabling look-up, at the wind-driven generator of the present invention In output power control method, it is possible to significantly more suppression wind-driven generator rotating speed rises, the fluctuation of the rotating speed of wind-driven generator The least, such that it is able to reduce the frequent movement of pitch-controlled system, be conducive to extending the service life of pitch-controlled system.Reference Fig. 6, for Wind-driven generator output torque curve contrast schematic diagram under two kinds of control methods.Under two kinds of control methods, wind-power electricity generation The situation of change of machine output torque keeps consistent substantially.

With reference to Fig. 7, for rotor blade pitch angular curve contrast schematic diagram under two kinds of control methods.With reference to Fig. 8, for wind Impeller blade propeller pitch angle curve local contrast schematic diagram under two kinds of control methods.From Fig. 7 and Fig. 8, with control methods of tabling look-up Comparing, in the output power control method for wind driven generator of the present invention, the blade pitch angle change of wind-driven generator is more steady, Thus decrease the frequent movement of pitch-controlled system.

The torque set-point of wind-driven generator can effectively be limited by the present invention, can make wind with speed faster again The rotating speed of power generator revert to the rated speed of wind-driven generator.Ensureing same at overload of unit not long-play Time, can reduce the action frequency of pitch-controlled system, and then reduce the fatigue load of root of blade, increase blade and pitch variable bearings Service life.

Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof Within, then the present invention is also intended to comprise these change and modification.

Claims (4)

1. an output power control method for wind driven generator, including: the rotating speed of wind-driven generator is periodically sampled, It is characterized in that, in each rotating speed sampling period, according to rotating speed sampled value, by the rotational speed and torque curve of wind-driven generator Obtain corresponding torque value, rotating speed sampled value is multiplied with the torque value of acquisition, show that wind-driven generator is in corresponding rotating speed sampling Output in cycle；

During periodically sampling the rotating speed of wind-driven generator, the 1st rotating speed sampling period sampled to the n-th rotating speed Cycle is the starting stage, and n is the natural number more than 1；In each rotating speed sampling period after the starting stage, show that wind-force is sent out The arithmetic mean of instantaneous value of motor output within front n the rotating speed sampling period, then according to wind-driven generator at front n rotating speed The output of wind-driven generator is turned by the arithmetic mean of instantaneous value of the output in the sampling period and the rated power of wind-driven generator Square is controlled；

Wherein, the rated power of described wind-driven generator is P_Specified, in the 1st rotating speed sampling period, by wind-driven generator the 1st The output P in rotating speed sampling period₁Divided by n, obtain setting of wind-driven generator output within the 1st rotating speed sampling period Meter meansigma methodsThen according to P₁With P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, draw the 1st rotating speed sampling week The torque set-point T of the wind-driven generator of phase₁；The torque set-point T of the wind-driven generator according to the 1st rotating speed sampling period₁To wind The output torque of power generator is controlled, and by T₁The tachometer value ω recorded with the 1st rotating speed sampling period₁It is multiplied, obtains the 2nd The reference power P of the wind-driven generator in rotating speed sampling period₂'；

In the i-th rotating speed sampling period, by wind-driven generator output summation within i the rotating speed sampling period set, i Taking 2 to n, i the rotating speed sampling period of described setting refers to that the 1st rotating speed sampling period is to the i-th rotating speed sampling period；By summation operation Result divided by n, obtain the design meansigma methods of wind-driven generator output within i the rotating speed sampling period set Then according to P_i' and P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, show that the wind-force in the i-th rotating speed sampling period is sent out The torque set-point T of motor_i；The torque set-point T of the wind-driven generator according to the i-th rotating speed sampling period_iTo wind-driven generator Output torque is controlled, and by T_iThe tachometer value ω recorded with the i-th rotating speed sampling period_iIt is multiplied, obtains the sampling of i+1 rotating speed The reference power P of the wind-driven generator in cycle_i+1'；

In the jth rotating speed sampling period, by wind-driven generator output summation within n the rotating speed sampling period set, j Taking the natural number more than n, n the rotating speed sampling period of described setting refers to that the jth-n+1 rotating speed sampling period is to jth rotating speed sampling week Phase；By the result of summation operation divided by n, obtain wind-driven generator output within n the rotating speed sampling period set Arithmetic mean of instantaneous valueThen according to P_j' and P_SpecifiedMagnitude relationship andWith P_SpecifiedMagnitude relationship, show that jth rotating speed is adopted The torque set-point T of the wind-driven generator in sample cycle_j；The torque set-point T of the wind-driven generator according to the jth rotating speed sampling period_j Output torque to wind-driven generator is controlled, and by T_jThe tachometer value ω recorded with the jth rotating speed sampling period_jIt is multiplied, obtains The reference power P of the wind-driven generator in jth+1 rotating speed sampling period_j+1'。

2. a kind of output power control method for wind driven generator as claimed in claim 1, it is characterised in that adopt at the 1st rotating speed In the sample cycle, in the design meansigma methods obtaining wind-driven generator output within the 1st rotating speed sampling periodAfterwards, according to Below equation determines the 1st torque modification coefficient d T₁:

dT₁=dT₁'×k₁

dT₁' take 1, whenTime, k₁=1；WhenAnd P₁>P_SpecifiedTime, k₁∈[0.995,1)；When And P₁=P_SpecifiedTime, k₁∈(1,1.005]；WhenAnd P₁>P_SpecifiedTime, k₁∈(1,1.005]；WhenOr P₁<P_Specified Time, k₁∈(1,1.005]；

Determining the 1st torque modification coefficient d T₁Afterwards, the 2nd torque modification coefficient intermediate value dT is determined₂' and the 1st rotating speed sampling week The torque set-point T of the wind-driven generator of phase₁, dT₂'=dT₁, T₁=dT₁×T_e, T_e=1.05T_Specified, T_SpecifiedFor wind-driven generator Nominal torque；It is then determined that the reference power P of the wind-driven generator in the 2nd rotating speed sampling period₂', P₂'=T₁×ω₁；

In the i-th rotating speed sampling period, obtaining wind-driven generator output within i the rotating speed sampling period set Design meansigma methodsAfterwards, the i-th torque modification coefficient d T is determined according to below equation_i:

dT_i=dT_i'×k_i

WhenTime, k_i=1；WhenAnd P_i'>P_SpecifiedTime, k_i∈[0.995,1)；WhenAnd P_i'= P_SpecifiedTime, k_i∈(1,1.005]；WhenAnd P_i'>P_SpecifiedTime, k_i∈(1,1.005]；WhenOr P_i'<P_SpecifiedTime, k_i ∈(1,1.005]；

Determining the i-th torque modification coefficient d T_iAfterwards, i+1 torque modification coefficient intermediate value dT is determined_i+1' and the sampling of the i-th rotating speed The torque set-point T of the wind-driven generator in cycle_i, dT_i+1'=dT_i, T_i=dT_i×T_e；It is then determined that the i+1 rotating speed sampling period The reference power P of wind-driven generator_i+1', P_i+1'=T_i×ω_i；

In the jth rotating speed sampling period, obtaining wind-driven generator output within n the rotating speed sampling period set Arithmetic mean of instantaneous valueAfterwards, jth torque modification coefficient d T is determined according to below equation_j:

dT_j=dT_j'×k_j

WhenTime, k_j=1；WhenAnd P_j'>P_SpecifiedTime, k_j∈[0.995,1)；WhenAnd P_j' =P_SpecifiedTime, k_j∈(1,1.005]；WhenAnd P_j'>P_SpecifiedTime, k_j∈(1,1.005]；WhenOr P_j'<P_SpecifiedTime, k_j∈(1,1.005]；

Determining jth torque modification coefficient d T_jAfterwards, jth+1 torque modification coefficient intermediate value dT is determined_j+1' and the sampling of jth rotating speed The torque set-point T of the wind-driven generator in cycle_j, dT_j+1'=dT_j, T_j=dT_j×T_e；It is then determined that jth+1 rotating speed sampling period The reference power P of wind-driven generator_j+1',

P_j+1'=T_j×ω_j。

3. a kind of output power control method for wind driven generator as claimed in claim 1, it is characterised in that in starting stage mistake After each rotating speed sampling period in, the rated speed of rotating speed sampled value Yu wind-driven generator is made difference operation, obtains speed discrepancy Value；With described rotating speed difference as foundation, the propeller pitch angle of the blade of wind-driven generator is carried out PID control；Then according to PID control Result, and utilize pitch-controlled system that the propeller pitch angle of the blade of wind-driven generator is controlled.

4. a kind of output power control method for wind driven generator as claimed in claim 1, it is characterised in that described according to wind-force The torque of wind-driven generator is controlled comprising the following steps by the torque set-point of electromotor: according to the torque of wind-driven generator Set-point, uses Direct Torque Control to be controlled the output torque of wind-driven generator.