CN101504442A - Real-time detection method for double-SRF dual-feedback aerogenerator rotor current positive and negative components - Google Patents

Abstract

The invention discloses a method for detecting positive and negative sequence components of rotor current of a doubly fed wind power generator under double SRF in real time, which comprises the following steps:1) continuously sampling an instantaneous value of a current three-phase rotor current signal; 2) detecting an angle synchronously rotated with an electric network in the sampling moment; 3) detecting a rotor electrical angle; 4) converting the sampled instantaneous value from a three-phase immobile coordinate system to a two-phase immobile coordinate system; 5) obtaining angles of the positive and negative sequence components of the rotor current at sampling moments through calculation according to a formula (2); 6) obtaining the positive and negative sequence components of the rotor current of the doubly fed wind power generator under the current two-phase immobile coordinate system through calculation according to a formula (3); and 7) performing inverse Clark transform on the positive and negative sequence components of the rotor current of the doubly fed wind power generator under the two-phase immobile coordinate system for calculation to obtain the positive and negative sequence components of the rotor current. The detection method has simple algorithm, no plural calculation, no filter, no need of constructing a synchronous rotating vector for voltage and current, and strong real-time; and the algorithm has no delay, and is easy to realize in engineering.

Description

The real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under two SRF

Technical field

The present invention relates to the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under a kind of couple of SRF, belong to the Electrical Control Technology field.

Background technology

The double-feedback type wind generator technology is the mainstream technology that obtains widespread use in the current Large-scale Wind Turbines.(having the negative sequence voltage component in the line voltage) when uneven appears in the electrical network that inserts when double-fed generator, will cause stator winding heating, generator generation torque pulsation and to problems such as electrical network transmission power vibrations; In the double-fed wind power generator rotor electric current, induce simultaneously positive sequence, negative phase-sequence amount.Therefore, in the control system of the rotor current of double-feedback aerogenerator, must detect double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount real-time,, guarantee safe, the stable and operation efficiently of double-fed generator by control corresponding.

Because the frequency of double-fed wind power generator rotor electric current changes constantly, traditional instantaneous symmetrical component method is realized bigger to the real-time detection difficulty of double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount.Double-fed wind power generator rotor electric current positive sequence, negative phase-sequence quantity measuring method can be divided into following a few class at present:

(1) based on the detection method of low-pass filtering, the characteristics of these class methods: need not be reference with the voltage waveform 1., thereby can be used for detecting the harmonic component of electric current; 2. be too dependent on the adjustment of filter parameter, the phase shift that can't compensating filter causes is subject to the influence of system frequency excursion; 3. can't compensate because the time-delay that low-pass filtering causes;

(2) based on the detection method of trapper, the characteristics of these class methods: need not be reference with the voltage waveform 1., thereby can be used for detecting the harmonic component of electric current; 2. be too dependent on the adjustment of trap parameter, can't compensate the phase shift that trapper causes, be subject to the influence of system frequency excursion;

3. can't compensate because the time-delay that trapper causes.

At the problems referred to above, the present invention proposes double-fed wind power generator rotor electric current positive sequence under a kind of novel couple of SRF, the negative phase-sequence amount method of detection in real time.

Summary of the invention

The technical problem to be solved in the present invention is: overcome the shortcoming of double-fed wind power generator rotor electric current positive-negative sequence quantity measuring method under existing two SRF, double-fed wind power generator rotor electric current positive-negative sequence amount real-time detection method under simple, the practical two SRF of a kind of algorithm is provided.

The technical solution adopted for the present invention to solve the technical problems is as follows: the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under two SRF, this method is by three-phase rotor current sampling module, angular detection module with the synchronized rotation, rotor electrical angle detection module, coordinate transformation module, rotor current positive-negative sequence measuring angle computing module, double-fed wind power generator rotor electric current positive-negative sequence amount computing module under the two-phase rest frame, realize in the real-time detection apparatus that three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module constitutes, specifically comprise the steps:

(1) three-phase rotor current sampling module carries out continuous sampling to the instantaneous value when three-phase rotor current signal, and sampled result is saved as among the sequence form Irotora relevant with time sequencing (k), Irotorb (k), the Irotorc (k);

(2) save as the sequence form θ relevant with the angular detection module of synchronized rotation detects sampling instant with the angle of synchronized rotation and with it with time sequencing _s(k) in;

(3) rotor electrical angle detection module detects the rotor electrical angle of sampling instant and it is saved as the sequence form θ relevant with time sequencing _r(k) in;

(4) coordinate transformation module is converted to the two-phase rest frame with sampled instantaneous value by the three phase static coordinate system, and the result is saved among the sequence form α relevant with time sequencing (k), the β (k); Its transition matrix is:

$\left[\begin{array}{c}\mathrm{\α}\left(k\right)\\ \mathrm{\β}\left(k\right)\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}\mathrm{Irotora}\left(k\right)\\ \mathrm{Irotorb}\left(k\right)\\ \mathrm{Irotorc}\left(k\right)\end{array}\right]---\left(1\right)$

(5) rotor current positive-negative sequence measuring angle computing module is according to the θ of electrical network angular detection module _s(k) detect θ with rotor electrical angle detection module _r(k) calculate rotor current positive sequence, negative phase-sequence amount angle θ in each sampling instant ₊(k), θ _-(k); Its transition matrix is:

$\left[\begin{array}{c}{\mathrm{\θ}}_{+}\left(k\right)\\ {\mathrm{\θ}}_{-}\left(k\right)\end{array}\right]=\left[\begin{array}{cc}1& -1\\ -1& -1\end{array}\right]\left[\begin{array}{c}{\mathrm{\θ}}_s\left(k\right)\\ {\mathrm{\θ}}_r\left(k\right)\end{array}\right]---\left(2\right)$

(6) under the two-phase rest frame double-fed wind power generator rotor electric current positive-negative sequence amount computing module according to α (k), β (k), α (k-1), β (k-1), θ ₊(k), θ _-(k), θ ₊(k-1), θ _-(k-1), calculate current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k); Its conversion formula is:

$\left[\begin{array}{c}{\mathrm{\&alpha;}}_{+}\left(k\right)\\ {\mathrm{\&beta;}}_{+}\left(k\right)\\ {\mathrm{\&alpha;}}_{-}\left(k\right)\\ {\mathrm{\&beta;}}_{-}\left(k\right)\end{array}\right]={\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200910024852E00121.png"\; state="\{\{state\}\}">C</figure-callout>}}_1\&CenterDot;C_2^{-1}\&CenterDot;\left[\begin{array}{c}\mathrm{\&alpha;}\left(k\right)\\ \mathrm{\&beta;}\left(k\right)\\ \mathrm{\&alpha;}(k-1)\\ \mathrm{\&beta;}(k-1)\end{array}\right]---\left(3\right)$

${\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200910024852E00121.png"\; state="\{\{state\}\}">C</figure-callout>}}_1=\left[\begin{array}{cccc}\cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& 0& 0\\ \sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& 0& 0\\ 0& 0& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ 0& 0& \sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\end{array}\right]---\left(4\right)$

$C_2=\left[\begin{array}{cccc}\cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ \sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ \cos \left({\mathrm{\&theta;}}_{+}(k-1)\right)& -\sin \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{-}(k-1)\right)& -\sin \left({\mathrm{\&theta;}}_{-}(k-1)\right)\\ \sin \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \sin \left({\mathrm{\&theta;}}_{-}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{-}(k-1)\right)\end{array}\right]---\left(5\right)$

(7) three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module according to current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k) calculate rotor current positive sequence amount Irotora ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k); Its conversion formula is:

$\left[\begin{array}{c}{\mathrm{Irotora}}_{+}\left(k\right)\\ {\mathrm{Irotorb}}_{+}\left(k\right)\\ {\mathrm{Irotorc}}_{+}\left(k\right)\\ {\mathrm{Irotora}}_{-}\left(k\right)\\ {\mathrm{Irotorb}}_{-}\left(k\right)\\ {\mathrm{Irotorc}}_{-}\left(k\right)\end{array}\right]=\left[\begin{array}{cccc}1& 0& 0& 0\\ -\frac{1}{2}& \frac{\sqrt{3}}{2}& 0& 0\\ -\frac{1}{2}& -\frac{\sqrt{3}}{2}& 0& 0\\ 0& 0& 1& 0\\ 0& 0& -\frac{1}{2}& \frac{\sqrt{3}}{2}\\ 0& 0& -\frac{1}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{\mathrm{\&alpha;}}_{+}\left(k\right)\\ {\mathrm{\&beta;}}_{+}\left(k\right)\\ {\mathrm{\&alpha;}}_{-}\left(k\right)\\ {\mathrm{\&beta;}}_{-}\left(k\right)\end{array}\right]---\left(6\right)$

The coordinate transformation module that relates in the real-time detection apparatus of the inventive method, adopt the form of Clark conversion, the instantaneous value that is used for double-fed wind power generator rotor current signal that sampling is obtained is converted to the two-phase rest frame by the three phase static coordinate system, is output as sequence form α (k), β (k); Described rotor current positive sequence measuring angle, negative phase-sequence measuring angle computing module are used to calculate current rotor current positive sequence measuring angle, negative phase-sequence measuring angle, are output as rotor current positive sequence, the negative phase-sequence amount angle θ in each sampling instant ₊(k), θ _-(k); Double-fed wind power generator rotor electric current positive-negative sequence amount computing module under the described two-phase rest frame, receive α (k), β (k), α (k-1), the β (k-1) of coordinate transformation module output, the θ of rotor current positive sequence measuring angle, the output of negative phase-sequence measuring angle computing module ₊(k), θ _-(k), θ ₊(k-1), θ _-(k-1), calculate current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k); Described three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module receives the positive sequence amount α of double-fed wind power generator rotor electric current positive-negative sequence amount computing module output under the two-phase rest frame ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k) carry out anti-Clark transformation calculations and obtain rotor current positive sequence amount Irotora ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k).

Beneficial effect of the present invention is as follows: than traditional detection method, real-time detection according to double-fed wind power generator rotor electric current positive-negative sequence amount under two SRF proposed by the invention, the real-time positive sequence, the negative phase-sequence amount that realize the double-fed wind power generator rotor electric current detect, and can be applicable in steady-state analysis, performance analysis and the control and compensation of various asymmetric operations of double-fed wind power generator and unbalanced fault; Algorithm is simple, no trap link and filtering link cause time-delay, the calculating of no inverse trigonometric function, real-time; Be easy to Project Realization.

Description of drawings

Fig. 1 proposes the calculation flow chart of the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under two SRF for the present invention.

Fig. 2 is for containing the double-fed wind power generator rotor map of current of positive-negative sequence amount simultaneously.

Fig. 3 divides spirogram for known three-phase double-fed wind power generator rotor current transformation to the α β under the two-phase rest frame.

Fig. 4 divides spirogram for the α β of detected positive-negative sequence amount.

Fig. 5 is detected positive-negative sequence amount three-phase double-fed wind power generator rotor map of current.

Embodiment

The real-time detection apparatus of double-fed wind power generator rotor electric current positive-negative sequence amount under the of the present invention couple of SRF, comprise: three-phase rotor current sampling module, be used for detecting in real time the instantaneous value of current three-phase rotor current signal, and sampled result is saved as among the sequence form Irotora relevant with time sequencing (k), Irotorb (k), the Irotorc (k); With the angular detection module of synchronized rotation, what be used to detect sampling instant saves as the sequence form θ relevant with time sequencing with the angle of synchronized rotation and with it _s(k) in; Rotor electrical angle detection module is used to detect the rotor electrical angle of sampling instant and it is saved as the sequence form θ relevant with time sequencing _r(k) in; Coordinate transformation module is used for the three phase static coordinate system is converted to the two-phase rest frame, and the result is saved among the sequence form α relevant with time sequencing (k), the β (k); Rotor current positive sequence measuring angle, negative phase-sequence measuring angle computing module are used to calculate rotor current positive sequence, the negative phase-sequence amount angle θ in each sampling instant ₊(k), θ _-(k); Double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount computing module under the two-phase rest frame, be used to calculate current under the two-phase rest frame double-fed wind power generator rotor electric current positive-sequence component α ₊(k), β ₊(k), negative sequence component α _-(k), β _-(k); Three phase static coordinate system lower rotor part electric current positive sequence, negative phase-sequence amount computing module are used to calculate rotor current positive sequence amount Irotora ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k).

Be illustrated in figure 1 as the process flow diagram of detection method of the present invention, its specific implementation process is as follows:

When double-fed generator inserts the appearance imbalance of electrical network (having the negative sequence voltage component in the line voltage), in the double-fed wind power generator rotor electric current, induce positive sequence, negative phase-sequence amount.This moment, the instantaneous value of real-time sampling double-fed wind power generator rotor electric current was saved in the sequence form α relevant with time sequencing (k), β (k) through after the coordinate transform, saved as the sequence form θ relevant with time sequencing by acquisitions such as phaselocked loops with the angle of synchronized rotation _s(k), the rotor electrical angle by acquisitions such as scrambler or Speedless sensor detection sampling instant saves as the sequence form θ relevant with time sequencing _r(k), obtain rotor current positive sequence amount Irotora through double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount computing module and rotor current positive sequence, negative phase-sequence amount computing module under the two-phase rest frame after calculating ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k).

The inventor is according to the characteristics of rotor current, proved above judgement by Computer Simulation, in double-fed wind power generator three-phase rotor current, the amplitude and the frequency of positive sequence amount, negative phase-sequence amount change constantly, realize real-time detection to double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount by the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount of the present invention; Algorithm of the present invention owing to can not obtain α (k-1), β (k-1), so can produce a non-model error at initial time, is the waveform after stablizing at initial time in the present embodiment.Fig. 2 is for comprising the double-fed wind power generator rotor current waveform of positive sequence, negative sequence component simultaneously, Fig. 3 divides spirogram for known three-phase double-fed wind power generator rotor current transformation to the α β under the two-phase rest frame, positive-sequence component, negative sequence component by double-fed wind power generator rotor electric current under the two-phase rest frame of Fig. 4 constitute, and Fig. 5 is positive sequence, the negative sequence component waveform of double-fed wind power generator rotor electric current; By above waveform as can be seen, the present invention has realized the real-time detection to double-fed wind power generator rotor electric current positive sequence, negative phase-sequence amount.

Claims (4)

1, the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under two SRF, realize in this method real-time detection apparatus that double-fed wind power generator rotor electric current positive-negative sequence amount computing module, three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module constitute under by three-phase rotor current sampling module, angular detection module, rotor electrical angle detection module, coordinate transformation module, rotor current positive-negative sequence measuring angle computing module, two-phase rest frame with synchronized rotation, specifically comprise the steps:

(1) three-phase rotor current sampling module carries out continuous sampling to the instantaneous value when three-phase rotor current signal, and sampled result is saved as among the sequence form Irotora relevant with time sequencing (k), Irotorb (k), the Irotorc (k);

(2) save as the sequence form θ relevant with the angular detection module of synchronized rotation detects sampling instant with the angle of synchronized rotation and with it with time sequencing _s(k) in;

(3) rotor electrical angle detection module detects the rotor electrical angle of sampling instant and it is saved as the sequence form θ relevant with time sequencing _r(k) in;

(4) coordinate transformation module is converted to the two-phase rest frame with sampled instantaneous value by the three phase static coordinate system, and the result is saved among the sequence form α relevant with time sequencing (k), the β (k); Its transition matrix is:

$\left[\begin{array}{c}\mathrm{\&alpha;}\left(k\right)\\ \mathrm{\&beta;}\left(k\right)\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}\mathrm{Irotora}\left(k\right)\\ \mathrm{Irotorb}\left(k\right)\\ \mathrm{Irotorc}\left(k\right)\end{array}\right]---\left(1\right)$

(5) rotor current positive-negative sequence measuring angle computing module is according to the θ of electrical network angular detection module _s(k) detect θ with rotor electrical angle detection module _r(k) calculate rotor current positive sequence, negative phase-sequence amount angle θ in each sampling instant ₊(k), θ _-(k); Its transition matrix is:

$\left[\begin{array}{c}{\mathrm{\&theta;}}_{+}\left(k\right)\\ {\mathrm{\&theta;}}_{-}\left(k\right)\end{array}\right]=\left[\begin{array}{cc}1& -1\\ -1& -1\end{array}\right]\left[\begin{array}{c}{\mathrm{\&theta;}}_s\left(k\right)\\ {\mathrm{\&theta;}}_r\left(k\right)\end{array}\right]---\left(2\right)$

(6) under the two-phase rest frame double-fed wind power generator rotor electric current positive-negative sequence amount computing module according to α (k), β (k), α (k-1), β (k-1), θ ₊(k), θ _-(k), θ ₊(k-1), θ _-(k-1), calculate current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k); Its conversion formula is:

$\left[\begin{array}{c}{\mathrm{\&alpha;}}_{+}\left(k\right)\\ {\mathrm{\&beta;}}_{+}\left(k\right)\\ {\mathrm{\&alpha;}}_{-}\left(k\right)\\ {\mathrm{\&beta;}}_{-}\left(k\right)\end{array}\right]{=C}_1\&CenterDot;C_2^{-1}\left[\begin{array}{c}\mathrm{\&alpha;}\left(k\right)\\ \mathrm{\&beta;}\left(k\right)\\ \mathrm{\&alpha;}(k-1)\\ \mathrm{\&beta;}(k-1)\end{array}\right]---\left(3\right)$

$C_1=\left[\begin{array}{cccc}\cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& 0& 0\\ \sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& 0& 0\\ 0& 0& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ 0& 0& \sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\end{array}\right]---\left(4\right)$

$C_2=\left[\begin{array}{cccc}\cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& -\sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ \sin \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{+}\left(k\right)\right)& \sin \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)& \cos \left({\mathrm{\&theta;}}_{-}\left(k\right)\right)\\ \cos \left({\mathrm{\&theta;}}_{+}(k-1)\right)& -\sin \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{-}(k-1)\right)& -\sin \left({\mathrm{\&theta;}}_{-}(k-1)\right)\\ \sin \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{+}(k-1)\right)& \sin \left({\mathrm{\&theta;}}_{-}(k-1)\right)& \cos \left({\mathrm{\&theta;}}_{-}(k-1)\right)\end{array}\right]---\left(5\right)$

(7) three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module according to current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k) calculate rotor current positive sequence amount Irotora ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k); Its conversion formula is:

$\left[\begin{array}{c}{\mathrm{Irotora}}_{+}\left(k\right)\\ {\mathrm{Irotorb}}_{+}\left(k\right)\\ {\mathrm{Irotorc}}_{+}\left(k\right)\\ {\mathrm{Irotora}}_{-}\left(k\right)\\ {\mathrm{Irotorb}}_{-}\left(k\right)\\ {\mathrm{Irotorc}}_{-}\left(k\right)\end{array}\right]=\left[\begin{array}{cccc}1& 0& 0& 0\\ -\frac{1}{2}& \frac{\sqrt{3}}{2}& 0& 0\\ -\frac{1}{2}& -\frac{\sqrt{3}}{2}& 0& 0\\ 0& 0& 1& 0\\ 0& 0& -\frac{1}{2}& \frac{\sqrt{3}}{2}\\ 0& 0& -\frac{1}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{\mathrm{\&alpha;}}_{+}\left(k\right)\\ {\mathrm{\&beta;}}_{+}\left(k\right)\\ {\mathrm{\&alpha;}}_{-}\left(k\right)\\ {\mathrm{\&beta;}}_{-}\left(k\right)\end{array}\right]---\left(6\right)$

2, the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under the according to claim 1 couple of SRF is characterized in that: detect sampling instant and the angle sequence form θ synchronized rotation _s(k), adopt phase-locked loop manner to realize.

3, the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under the according to claim 2 couple of SRF is characterized in that: detection rotor electrical angle sequence form θ _r(k), with scrambler or do not have the velocity pick-up technical approach and realize.

4, the real-time detection method of double-fed wind power generator rotor electric current positive-negative sequence amount under the according to claim 1 couple of SRF, it is characterized in that described coordinate transformation module, adopt the form of Clark conversion, the instantaneous value that is used for double-fed wind power generator rotor current signal that sampling is obtained is converted to the two-phase rest frame by the three phase static coordinate system, is output as sequence form α (k), β (k); Described rotor current positive sequence measuring angle, negative phase-sequence measuring angle computing module are used to calculate current rotor current positive sequence measuring angle, negative phase-sequence measuring angle, are output as rotor current positive sequence, the negative phase-sequence amount angle θ in each sampling instant ₊(k), θ _-(k); Double-fed wind power generator rotor electric current positive-negative sequence amount computing module under the described two-phase rest frame, receive α (k), β (k), α (k-1), the β (k-1) of coordinate transformation module output, the θ of rotor current positive sequence measuring angle, the output of negative phase-sequence measuring angle computing module ₊(k), θ _-(k), θ ₊(k-1), θ _-(k-1), calculate current under the two-phase rest frame double-fed wind power generator rotor electric current positive sequence amount α ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k); Described three phase static coordinate system lower rotor part electric current positive-negative sequence amount computing module receives the positive sequence amount α of double-fed wind power generator rotor electric current positive-negative sequence amount computing module output under the two-phase rest frame ₊(k), β ₊(k), negative phase-sequence amount α _-(k), β _-(k) carry out anti-Clark transformation calculations and obtain rotor current positive sequence amount Irotora ₊(k), Irotorb ₊(k), Irotorc ₊(k), negative phase-sequence amount Irotora _-(k), Irotorb _-(k), Irotorc _-(k).

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