CN102664413B - Method for controlling harmonic current of full-power converter for suppressing wind power grid integration and controller - Google Patents

Abstract

The invention discloses a method for controlling the harmonic current of a full-power converter for suppressing wind power grid integration and a controller. The method comprises the following steps of: acquiring three-phase current and three-phase voltage of a grid-integrated converter, performing constant power conversion on an acquired network side three-phase current signal from a static three-phase coordinate system to synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems, and performing low pass filtering to obtain a dq axis component; and obtaining a dq axis control voltage by adopting a network voltage directional vector control way, performing constant power conversion on the control voltage from synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems to the static three-phase coordinate system to obtain a fundamental wave control voltage and five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages, adding the fundamental wave control voltage and the five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages to obtain a final control voltage, and modulating the final control voltage to obtain a control switch signal, so that accurate control of five-time, seven-time, eleven-time and thirteen-time harmonic current is realized.

Description

Suppress full power convertor harmonic current control method and controller for wind-electricity integration

Technical field

The present invention relates to current control method and controller, full power convertor harmonic current control method and controller for especially a kind of inhibition wind-electricity integration.

Background technology

In adopting the grid-connected wind generator system of full power convertor, grid-connected converter net side reactor inductance value is generally less, its switching frequency is low, the nonlinear characteristics such as the dead band of mains by harmonics voltage and inverter power electronic switching device and tube voltage drop will make grid-connected converter produce low order (5,7,11,13 times) harmonic current largely, wherein especially heavier with 5 times, 7 subharmonic current compositions.This will cause the wave distortion of wind generator system grid-connected current, and sine variation has a strong impact on the wind generator system output quality of power supply, reduces stability and the reliability of system works.

At present, for the grid-connected harmonic current of wind generator system, suppress more existing solutions, one of them, mainly for generator side converter positive-negative sequence current component in wind generator system and each low-order harmonic current component, adopt a kind of traditional PI adjuster to add much frequency resonance (PI-MFR) controller structure, generator positive-negative sequence current under unbalanced source voltage and each low-order harmonic electric current are realized to accurately control.But this technology is the harmonic current braking measure to net side converter not.

Harmonic wave for power network current of variable-speed constant-frequency doubly-fed wind power generator system suppresses in addition, by extracting the AC harmonic current component in power network current and being changed to corresponding harmonic wave controlled quentity controlled variable with the contravariant of contrary angular direction, harmonic current reference value as net side inverter, and control the corresponding harmonic compensation amount of output by net side inverter, reach the object that suppresses harmonic current.But this technology is not considered the cross-couplings influence of harmonic current ring and the mutual interference effect between different frequency harmonic wave, this will be unfavorable for grid-connected harmonic current to realize the stable operation of accurately control and the system of assurance.

Adoption rate resonant controller suppresses grid-connected harmonic current at present, because ratio resonant controller algorithm is more complicated, is unfavorable for Project Realization, and it is difficult to eliminate the phase mutual interference between different frequency harmonic current.On the other hand, because the resistance of net side reactor is generally very little, the impact of net side low-order harmonic reactance will account for leading role in grid-connected harmonic current suppresses.And the control program that prior art is carried is all not yet considered the cross-couplings impact of low-order harmonic reactance on harmonic current ring, this will be unfavorable for grid-connected harmonic current to realize the stable operation of accurately control and the system of assurance.

Summary of the invention

For the problems referred to above, the invention provides the low-order harmonic electric current of full power convertor grid side converter for a kind of effective inhibition wind-electricity integration, improve wind generator system network electric energy quality, be conducive to improve the full power convertor harmonic current control method for inhibition wind-electricity integration of the stability of wind generator system work, and controller.

In order to solve the problems of the technologies described above, the invention provides full power convertor harmonic current control method for a kind of inhibition wind-electricity integration, it is characterized in that, comprise the following steps:

(1) gather the three-phase current i of grid-connected converter _ga, i _gb, i _gc:

(2) gather electrical network three-phase voltage u _ga, u _gb, u _gc;

(3) three phase network voltage signal u _ga, u _gb, u _gcthrough static three-phase abc coordinate system transformation, to the permanent power conversion of static two-phase α β reference axis coordinate system, obtain the voltage e under α β axis coordinate system _α, e _β,

$\left[\begin{array}{c}{e}_{\mathrm{\α}}\\ e_{\mathrm{\β}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \sqrt{\frac{3}{4}}& -\sqrt{\frac{3}{4}}\end{array}\right]\left[\begin{array}{c}{e}_{\mathrm{ga}}\\ e_{\mathrm{gb}}\\ e_{\mathrm{gc}}\end{array}\right]$

Line voltage is directed, obtains line voltage e _gdwith electrical network electrical degree θ _g,

$e_{\mathrm{gd}}=\sqrt{e_{\mathrm{\α}}^2+e_{\mathrm{\β}}^2},$ ${\mathrm{\θ}}_g=\arctan \frac{e_{\mathrm{\β}}}{e_{\mathrm{\α}}}$

(4) by the net side converter three-phase current signal i collecting _ga, i _gb, i _gcthrough static abc tri-phase coordinate systems, to synchronous rotating frame after permanent power conversion, then pass through low pass filter filtering, obtain fundamental current dq axle component i _gd1and i _gq1;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 5 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain the dq axle component i of electric current under 5 times of synchronous angular velocity rotating coordinate systems _gd5and i _gq5;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 7 times of synchronous angular velocity rotating coordinate systems _gd7and i _gq7;

Wherein, the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system is:

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 11 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 11 times of synchronous angular velocity rotating coordinate systems _gd11and i _gq11;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 13 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 13 times of synchronous angular velocity rotating coordinate systems _gd13and i _gq13;

(5) by first-harmonic control loop outer voltage PI output, obtain first-harmonic control loop current inner loop d shaft current set-point, current inner loop q axle set-point is 0, and its calculating formula is;

$\left\{\begin{array}{c}{i}_{\mathrm{gd}1}^{*}=(K_p+K_i/s)(U_{\mathrm{dc}}^{*}-U_{\mathrm{dc}})\\ i_{\mathrm{gq}1}^{*}=0\end{array}\right.$

Wherein, K _pand K _ibe respectively first-harmonic control loop outer voltage dq axle pi regulator proportionality coefficient and integral coefficient;

(6) adopt the vector control mode of line voltage orientation, by d, q shaft current is given and step (4) obtains i _gd1, i _gq1, by first-harmonic governing equation, obtain d, q axle control voltage u _cd1and u _cq1,

$\left\{\begin{array}{c}{u}_{\mathrm{cd}1}=U_{\mathrm{cd}1}^{\′}+{\mathrm{\ΔU}}_{\mathrm{cd}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gd}1}^{*}-i_{\mathrm{gd}1})+{\mathrm{\ωL}}_g{i}_{\mathrm{gq}1}+e_{\mathrm{gd}}\\ u_{\mathrm{cq}1}=U_{\mathrm{cq}1}^{\′}+{\mathrm{\ΔU}}_{\mathrm{cq}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gq}1}^{*}-i_{\mathrm{gq}1})-{\mathrm{\ωL}}_g{i}_{\mathrm{gd}1}\end{array}\right.$

Wherein, K _p1and K _i1be respectively first-harmonic control loop current inner loop dq axle pi regulator proportionality coefficient and integral coefficient; ω is synchronous rotary angular speed, L _gfor reactor inductance.

(7) the fundamental current dq axle calculating is controlled to component of voltage u _cd1and u _cq1via synchronous rotating frame, after the permanent power conversion of static abc tri-phase coordinate systems, obtain fundamental current three phase control voltage u _cabc1;

Wherein: synchronous rotating frame to the permanent power conversion of static abc tri-phase coordinate systems is:

(8) 5,7,11,13 subharmonic current dq axle component set-points are all made as to 0, through 5,7,11,13 subharmonic current governing equations,

$\left\{\begin{array}{c}{u}_{\mathrm{<figure-callout\; id="5"\; label="cd"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">cd</figure-callout>}5}={-5\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="5"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i5}/s)(i_{\mathrm{<figure-callout\; id="5"\; label="gq"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">gq</figure-callout>}5}^{*}-i_{\mathrm{gq}5})\\ u_{\mathrm{<figure-callout\; id="5"\; label="cq"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">cq</figure-callout>}5}=5\mathrm{\&omega;}{L}_g({\mathrm{<figure-callout\; id="5"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i5}/s)(i_{\mathrm{<figure-callout\; id="5"\; label="gd"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">gd</figure-callout>}5}^{*}-i_{\mathrm{gd}5})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{<figure-callout\; id="7"\; label="cd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">cd</figure-callout>}7}=7{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="7"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i7}/s)(i_{\mathrm{<figure-callout\; id="7"\; label="gq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">gq</figure-callout>}7}^{*}-i_{\mathrm{gq}7})\\ u_{\mathrm{<figure-callout\; id="7"\; label="cq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">cq</figure-callout>}7}=-7{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="7"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i7}/s)(i_{\mathrm{<figure-callout\; id="7"\; label="gd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">gd</figure-callout>}7}^{*}-i_{\mathrm{gd}7})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{<figure-callout\; id="11"\; label="cd"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">cd</figure-callout>}11}=-11{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="11"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i11}/s)(i_{\mathrm{<figure-callout\; id="11"\; label="gq"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">gq</figure-callout>}11}^{*}-i_{\mathrm{gq}11})\\ u_{\mathrm{<figure-callout\; id="11"\; label="cq"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">cq</figure-callout>}11}=11{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="11"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i11}/s)(i_{\mathrm{<figure-callout\; id="11"\; label="gd"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">gd</figure-callout>}11}^{*}-i_{\mathrm{gd}11})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{<figure-callout\; id="13"\; label="cd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">cd</figure-callout>}13}=13{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="13"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i13}/s)(i_{\mathrm{<figure-callout\; id="13"\; label="gq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">gq</figure-callout>}13}^{*}-i_{\mathrm{gq}13})\\ u_{\mathrm{<figure-callout\; id="13"\; label="cq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">cq</figure-callout>}13}=-13{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="13"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i13}/s)(i_{\mathrm{<figure-callout\; id="13"\; label="gd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">gd</figure-callout>}13}^{*}-i_{\mathrm{gd}13})\end{array}\right.$

Obtain respectively 5,7,11,13 subharmonic bucking voltage dq axle components; Wherein: K _p5, K _p7, K _p11, K _p13and K _i5, K _i7, K _i11, K _i13be respectively 5,7,11,13 subharmonic current control loop dq axle pi regulator proportionality coefficient and integral coefficients.

(9) 5 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd5, u _cq5through 5 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 5 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc5:

7 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd7, u _cq7through 7 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 7 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc7:

11 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd11, u _cq11through 11 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 11 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc11:

13 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd13, u _cq13through 13 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 13 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc13:

(10) first-harmonic is controlled to voltage u _cabc1obtain 5,7,11,13 subharmonic three phase control voltage u with described (9) step _cabc5, u _cabc7, u _cabc11, u _cabc13addition obtains grid side converter and finally controls voltage u _ca, u _cb, u _cc;

(11) will finally control voltage u _ca, u _cb, u _ccafter the modulation of space vector pulse width modulation module, obtain the switching signal of controlling described grid side converter.

Full power convertor harmonic current controller for a kind of inhibition wind-electricity integration, it is characterized in that, comprise voltage hall sensor and current Hall transducer, wherein voltage hall sensor is connected with abc/ α β coordinate transformation module, described current Hall transducer is connected with harmonic current detection module, the output of described abc/ α β coordinate transformation module is connected with the input of described harmonic current detection module, the output of described harmonic current detection module is connected with respectively first-harmonic control loop and harmonic wave inhibitory control loop, the output of described abc/ α β coordinate transformation module is also connected with the input in harmonic wave inhibitory control loop with described first-harmonic control loop, the output of described first-harmonic control loop is connected with the input that synchronous angular velocity rotational coordinates is tied to the permanent power conversion module of static abc tri-phase coordinate systems, the output in this perseverance power conversion module and harmonic wave inhibitory control loop is all connected with the input of adder, the output of this adder is connected with the input of space vector pulse width modulation module, the output of this space vector pulse width modulation module is connected with the control input end of grid side converter.

Harmonic current detection module comprises synchronous permanent power conversion module, 5 times of permanent power conversion modules, 7 times of permanent power conversion modules, 11 times of permanent power conversion modules, 13 times of permanent power conversion modules, the first low pass filter, the second low pass filter, the 3rd low pass filter, the 4th low pass filter and the 5th low pass filter, wherein synchronous permanent power conversion module, 5 times of permanent power conversion modules, 7 times of permanent power conversion modules, the input of 11 times of permanent power conversion modules and 13 times of permanent power conversion modules is connected with described current Hall transducer respectively, described synchronous permanent power conversion module, 5 times of permanent power conversion modules, 7 times of permanent power conversion modules, the output of 11 times of permanent power conversion modules and 13 times of permanent power conversion modules respectively with the first low pass filter, the second low pass filter, the 3rd low pass filter, the 4th low pass filter is connected with the input of the 5th low pass filter, and the output of the first low pass filter is connected with the input of described first-harmonic control loop, the second low pass filter, the 3rd low pass filter, the output of the 4th low pass filter and the 5th low pass filter is connected with the input in described harmonic wave inhibitory control loop.

Harmonic wave inhibitory control loop comprises 5 subharmonic current control loops, 7 subharmonic current control loops, 11 subharmonic current control loops and 13 subharmonic current control loops and 5 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, 11 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems and the permanent power conversion module that 13 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems, described 5 subharmonic current control loops, 7 subharmonic current control loops, the input of 11 subharmonic current control loops and 13 subharmonic current control loops respectively with the second low pass filter, the 3rd low pass filter, the 4th low pass filter and the 5th low pass filter output be connected, 5 subharmonic current control loops, 7 subharmonic current control loops, the output of 11 subharmonic current control loops and 13 subharmonic current control loops is tied to respectively the permanent power conversion module of static abc tri-phase coordinate systems with 5 times of synchronous angular velocity rotational coordinatess, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, the permanent power conversion module that 11 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems is connected with the input that 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, 5 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module of static abc tri-phase coordinate systems, the permanent power conversion module that 11 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems is connected with the output of permanent power conversion module and the input of adder that 13 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems, the output of this adder is connected with the input of space vector pulse width modulation module, the output of this space vector pulse width modulation module is connected with the control input end of grid side converter.

The invention has the beneficial effects as follows:

Can effectively suppress the low-order harmonic electric current of full power convertor grid side converter for wind-electricity integration, improve wind generator system network electric energy quality, be conducive to improve stability and the reliability of wind generator system work.

Adopt after harmonic current braking measure of the present invention, net side three-phase current sine degree is better improved, and the great amplitude of low-order harmonic current ratio reduces; The proportion that harmonic current components accounts for fundamental current obviously declines, and adopts the present invention to have good inhibitory action to the low-order harmonic electric current of the grid-connected converter output of net side in real system.

The present invention takes into full account phase mutual interference between different frequency harmonic current and the cross-couplings influence of harmonic current ring, the accurate control of realization to 5,7,11,13 subharmonic currents, reach the object that suppresses grid-connected converter 5,7,11,13 subharmonic currents, this invention control algolithm is simple simultaneously, is easy to realize.

Accompanying drawing explanation

Fig. 1 is a kind of control principle block diagram of full power convertor harmonic current for wind-electricity integration that suppresses provided by the invention;

Fig. 2 is the graph of a relation between static α β coordinate system, 5 times of synchronous angular velocity rotating coordinate systems, 7 times of synchronous angular velocity rotating coordinate systems, 11 times of synchronous angular velocity rotating coordinate systems and 13 times of synchronous angular velocity rotating coordinate systems;

Fig. 3 is grid-connected with full power convertor grid side converter first-harmonic control drawing;

Fig. 4 suppresses 5,7 subharmonic current control drawings;

Fig. 5 suppresses 11,13 subharmonic current control drawings;

Fig. 6 is control and the embodiment of the present invention comparison of wave shape figure of prior art;

Fig. 7 is control and the embodiment of the present invention comparison of wave shape figure of prior art.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in further detail.

As shown in Fig. 1 to 5, full power convertor harmonic current control method for a kind of inhibition wind-electricity integration, is characterized in that, comprises the following steps:

(1) gather the three-phase current i of grid-connected converter _ga, i _gb, i _gc:

(2) gather electrical network three-phase voltage u _ga, u _gb, u _gc;

(3) three phase network voltage signal u _ga, u _gb, u _gcthrough static three-phase abc coordinate system transformation, to the permanent power conversion of static two-phase α β reference axis coordinate system, obtain the voltage e under α β axis coordinate system _α, e _β,

$\left[\begin{array}{c}{e}_{\mathrm{\&alpha;}}\\ e_{\mathrm{\&beta;}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \sqrt{\frac{3}{4}}& -\sqrt{\frac{3}{4}}\end{array}\right]\left[\begin{array}{c}{e}_{\mathrm{ga}}\\ e_{\mathrm{gb}}\\ e_{\mathrm{gc}}\end{array}\right]$

Line voltage is directed, obtains line voltage e _gdwith electrical network electrical degree θ _g,

$e_{\mathrm{gd}}=\sqrt{e_{\mathrm{\&alpha;}}^2+e_{\mathrm{\&beta;}}^2},$ ${\mathrm{\&theta;}}_g=\arctan \frac{e_{\mathrm{\&beta;}}}{e_{\mathrm{\&alpha;}}}$

(4) by the net side converter three-phase current signal i collecting _ga, i _gb, i _gcthrough static abc tri-phase coordinate systems, to synchronous rotating frame after permanent power conversion, then pass through low pass filter filtering, obtain fundamental current dq axle component i _gd1and i _gq1;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 5 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain the dq axle component i of electric current under 5 times of synchronous angular velocity rotating coordinate systems _gd5and i _gq5;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 7 times of synchronous angular velocity rotating coordinate systems _gd7and i _gq7;

Wherein, the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system is:

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 11 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 11 times of synchronous angular velocity rotating coordinate systems _gd11and i _gq11;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 13 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 13 times of synchronous angular velocity rotating coordinate systems _gd13and i _gq13;

(5) by first-harmonic control loop outer voltage PI output, obtain first-harmonic control loop current inner loop d shaft current set-point, current inner loop q axle set-point is 0, and its calculating formula is;

$\left\{\begin{array}{c}{i}_{\mathrm{gd}1}^{*}=(K_p+K_i/s)(U_{\mathrm{dc}}^{*}-U_{\mathrm{dc}})\\ i_{\mathrm{gq}1}^{*}=0\end{array}\right.$

Wherein, K _pand K _ibe respectively first-harmonic control loop outer voltage dq axle pi regulator proportionality coefficient and integral coefficient;

(6) adopt the vector control mode of line voltage orientation, by d, q shaft current is given and step (4) obtains i _gd1, i _gq1, by first-harmonic governing equation, obtain d, q axle control voltage u _cd1and u _cq1,

$\left\{\begin{array}{c}{u}_{\mathrm{cd}1}=U_{\mathrm{cd}1}^{\&prime;}+{\mathrm{\&Delta;U}}_{\mathrm{cd}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gd}1}^{*}-i_{\mathrm{gd}1})+{\mathrm{\&omega;L}}_g{i}_{\mathrm{gq}1}+e_{\mathrm{gd}}\\ u_{\mathrm{cq}1}=U_{\mathrm{cq}1}^{\&prime;}+{\mathrm{\&Delta;U}}_{\mathrm{cq}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gq}1}^{*}-i_{\mathrm{gq}1})-{\mathrm{\&omega;L}}_g{i}_{\mathrm{gd}1}\end{array}\right.$

Wherein, K _p1and K _i1be respectively first-harmonic control loop current inner loop dq axle pi regulator proportionality coefficient and integral coefficient; ω is synchronous rotary angular speed, L _gfor reactor inductance.

(7) the fundamental current dq axle calculating is controlled to component of voltage u _cd1and u _cq1via synchronous rotating frame, after the permanent power conversion of static abc tri-phase coordinate systems, obtain fundamental current three phase control voltage u _cabc1;

Wherein: synchronous rotating frame to the permanent power conversion of static abc tri-phase coordinate systems is:

(8) 5,7,11,13 subharmonic current dq axle component set-points are all made as to 0, through 5,7,11,13 subharmonic current governing equations,

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="5"\; label="u\; cd"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cd}}={-5\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="5"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+{\mathrm{<figure-callout\; id="5"\; label="K\; i"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_i/s)(i_{\mathrm{gq}5}^{*}-i_{\mathrm{gq}5})\\ {\mathrm{<figure-callout\; id="5"\; label="u\; cq"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cq}}=5\mathrm{\&omega;}{L}_g({\mathrm{<figure-callout\; id="5"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+{\mathrm{<figure-callout\; id="5"\; label="K\; i"\; filenames="HDA00001637382900011.png,HDA00001637382900031.png"\; state="\{\{state\}\}">K</figure-callout>}}_i/s)(i_{\mathrm{gd}5}^{*}-i_{\mathrm{gd}5})\end{array}\right.$

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="7"\; label="u\; cd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cd}}=7{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="7"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+{\mathrm{<figure-callout\; id="7"\; label="K\; i"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_i/s)(i_{\mathrm{gq}7}^{*}-i_{\mathrm{gq}7})\\ {\mathrm{<figure-callout\; id="7"\; label="u\; cq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cq}}=-7{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="7"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+{\mathrm{<figure-callout\; id="7"\; label="K\; i"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_i/s)(i_{\mathrm{gd}7}^{*}-i_{\mathrm{gd}7})\end{array}\right.$

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="11"\; label="u\; cd"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cd}}=-11{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="11"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i11}/s)(i_{\mathrm{gq}11}^{*}-i_{\mathrm{gq}11})\\ {\mathrm{<figure-callout\; id="11"\; label="u\; cq"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cq}}=11{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="11"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900032.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i11}/s)(i_{\mathrm{gd}11}^{*}-i_{\mathrm{gd}11})\end{array}\right.$

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="13"\; label="u\; cd"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cd}}=13{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="13"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i13}/s)(i_{\mathrm{gq}13}^{*}-i_{\mathrm{gq}13})\\ {\mathrm{<figure-callout\; id="13"\; label="u\; cq"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{cq}}=-13{\mathrm{\&omega;L}}_g({\mathrm{<figure-callout\; id="13"\; label="K\; p"\; filenames="HDA00001637382900011.png,HDA00001637382900021.png"\; state="\{\{state\}\}">K</figure-callout>}}_p+K_{i13}/s)(i_{\mathrm{gd}13}^{*}-i_{\mathrm{gd}13})\end{array}\right.$

Obtain respectively 5,7,11,13 subharmonic bucking voltage dq axle components; Wherein: K _p5, K _p7, K _p11, K _p13and K _i5, K _i7, K _i11, K _i13be respectively 5,7,11,13 subharmonic current control loop dq axle pi regulator proportionality coefficient and integral coefficients.

(9) 5 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd5, u _cq5through 5 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 5 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc5:

7 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd7, u _cq7through 7 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 7 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc7:

11 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd11, u _cq11through 11 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 11 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc11:

13 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd13, u _cq13through 13 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 13 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc13:

(10) first-harmonic is controlled to voltage u _cabc1obtain 5,7,11,13 subharmonic three phase control voltage u with described (9) step _cabc5, u _cabc7, u _cabc11, u _cabc13addition obtains grid side converter and finally controls voltage u _ca, u _cb, u _cc;

(11) will finally control voltage u _ca, u _cb, u _ccafter the modulation of space vector pulse width modulation module, obtain the switching signal of controlling described grid side converter.

Full power convertor harmonic current controller for a kind of inhibition wind-electricity integration, it is to realize suppressing the hardware designs of full power convertor harmonic current control method for wind-electricity integration, comprise for gathering the voltage hall sensor 3 of electrical network three-phase voltage and for gathering the current Hall transducer 4 of grid-connected converter three-phase current, wherein voltage hall sensor 3 is connected with abc/ α β coordinate transformation module 5, described current Hall transducer 4 is connected with harmonic current detection module, the output of described abc/ α β coordinate transformation module 5 is connected with the input of described harmonic current detection module, the output of described harmonic current detection module is connected with respectively first-harmonic control loop 19 and harmonic wave inhibitory control loop, the output of described abc/ α β coordinate transformation module 5 is also connected with the input in harmonic wave inhibitory control loop with described first-harmonic control loop 19, the output of described first-harmonic control loop 19 is connected with the input that synchronous angular velocity rotational coordinates is tied to the permanent power conversion module 20 of static abc tri-phase coordinate systems, the output in this perseverance power conversion module 20 and harmonic wave inhibitory control loop is all connected with the input of adder 22, the output of this adder 22 is connected with the input of space vector pulse width modulation module 2, the output of this space vector pulse width modulation module 2 is connected with the control input end of grid side converter 1.

Harmonic current detection module comprises synchronous permanent power conversion module 6, 5 times of permanent power conversion modules 7, 7 times of permanent power conversion modules 8, 11 times of permanent power conversion modules 9, 13 times of permanent power conversion modules 10, the first low pass filter 211, the second low pass filter 212, the 3rd low pass filter 213, the 4th low pass filter 214 and the 5th low pass filter 215, wherein synchronous permanent power conversion module 6, 5 times of permanent power conversion modules 7, 7 times of permanent power conversion modules 8, the input of 11 times of permanent power conversion modules 9 and 13 times of permanent power conversion modules 10 is connected with described current Hall transducer 4 respectively, described synchronous permanent power conversion module 6, 5 times of permanent power conversion modules 7, 7 times of permanent power conversion modules 8, the output of 11 times of permanent power conversion modules 9 and 13 times of permanent power conversion modules 10 respectively with the first low pass filter 211, the second low pass filter 212, the 3rd low pass filter 213, the 4th low pass filter 214 is connected with the input of the 5th low pass filter 215, and the output of the first low pass filter 211 is connected with the input of described first-harmonic control loop 19, the second low pass filter 212, the 3rd low pass filter 213, the output of the 4th low pass filter 214 and the 5th low pass filter 215 is connected with the input in described harmonic wave inhibitory control loop.

Harmonic wave inhibitory control loop 5 subharmonic current control loops 11,7 subharmonic current control loops 13,11 subharmonic current control loops 15 and 13 subharmonic current control loops 17 and 5 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 12 of static abc tri-phase coordinate systems, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 14 of static abc tri-phase coordinate systems, 11 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 16 of static abc tri-phase coordinate systems and the permanent power conversion module 18 that 13 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems, 5 subharmonic current control loops 11,7 subharmonic current control loops 13, the input of 11 subharmonic current control loops 15 and 13 subharmonic current control loops 17 respectively with the second low pass filter 212, the 3rd low pass filter 213, the 4th low pass filter 214 and the 5th low pass filter 215 output be connected, 5 subharmonic current control loops 11,7 subharmonic current control loops 13, the output of 11 subharmonic current control loops 15 and 13 subharmonic current control loops 17 is tied to respectively the permanent power conversion module 12 of static abc tri-phase coordinate systems with 5 times of synchronous angular velocity rotational coordinatess, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 14 of static abc tri-phase coordinate systems, the permanent power conversion module 16 that 11 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems is connected with the input that 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 18 of static abc tri-phase coordinate systems, 5 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 12 of static abc tri-phase coordinate systems, 7 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 14 of static abc tri-phase coordinate systems, the permanent power conversion module 16 that 11 times of synchronous angular velocity rotational coordinatess are tied to static abc tri-phase coordinate systems is connected with the input of adder 22 with the output that 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module 18 of static abc tri-phase coordinate systems, the output of this adder 22 is connected with the input of space vector pulse width modulation module 2, the output of this space vector pulse width modulation module 2 is connected with the control input end of grid side converter 1.

Contrast accompanying drawing 6 (a) and (b) known, adopts traditional control strategy (as accompanying drawing 6(a)) time, the distortion of net side three-phase current is comparatively serious, and sine is poor, and it is rich in low-order harmonic electric current, wherein especially heavier with 5,7 subharmonic current compositions.And adopting harmonic current braking measure of the present invention (accompanying drawing 6(b)) after, net side three-phase current sine degree is better improved, and the great amplitude of low-order harmonic current ratio reduces; Further net side three-phase current is carried out to spectral contrast analysis, as accompanying drawing 7 (a) and (b), take A phase current as example, the proportion that its 5 subharmonic current component accounts for fundamental current drops to 0.978% by 4.216%, and 7 subharmonic current components account for fundamental current proportion, by 1.25%, drops to 0.40%.As can be seen here, adopt the present invention to there is good inhibitory action to the low-order harmonic electric current of the grid-connected converter output of net side in real system.

The present invention takes into full account phase mutual interference between different frequency harmonic current and the cross-couplings influence of harmonic current ring, the accurate control of realization to 5,7,11,13 subharmonic currents, reach the object that suppresses grid-connected converter 5,7,11,13 subharmonic currents, this invention control algolithm is simple simultaneously, is easy to realize.

The above embodiment of the present invention is to be only explanation example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make on the basis of the above description other multi-form variation and changes.Here cannot give all execution modes exhaustive.Every still row in protection scope of the present invention of apparent variation that technical scheme of the present invention amplifies out or change that belong to.

Claims (2)

1. suppress a full power convertor harmonic current control method for wind-electricity integration, it is characterized in that, comprise the following steps:

(1) gather the three-phase current i of grid-connected converter _ga, i _gb, i _gc:

(2) gather electrical network three-phase voltage u _ga, u _gb, u _gc;

(3) three phase network voltage signal u _ga, u _gb, u _gcthrough static three-phase abc coordinate system transformation, to the permanent power conversion of static two-phase α β reference axis coordinate system, obtain the voltage e under α β axis coordinate system _α, e _β,

$\left[\begin{array}{c}{e}_{\mathrm{\&alpha;}}\\ e_{\mathrm{\&beta;}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \sqrt{\frac{3}{4}}& -\sqrt{\frac{3}{4}}\end{array}\right]\left[\begin{array}{c}{u}_{\mathrm{ga}}\\ u_{\mathrm{gb}}\\ u_{\mathrm{gc}}\end{array}\right]$

Line voltage is directed, obtains line voltage e _gdwith electrical network electrical degree θ _g,

$e_{\mathrm{gd}}=\sqrt{e_{\mathrm{\&alpha;}}^2+e_{\mathrm{\&beta;}}^2},{\mathrm{\&theta;}}_g=\arctan \frac{e_{\mathrm{\&beta;}}}{e_{\mathrm{\&alpha;}}}$

(4) by the net side converter three-phase current signal i collecting _ga, i _gb, i _gcthrough static abc tri-phase coordinate systems, to synchronous rotating frame after permanent power conversion, then pass through low pass filter filtering, obtain fundamental current dq axle component i _gd1and i _gq1;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 5 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain the dq axle component i of electric current under 5 times of synchronous angular velocity rotating coordinate systems _gd5and i _gq5;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 7 times of synchronous angular velocity rotating coordinate systems _gd7and i _gq7;

Wherein, the permanent power conversion of static abc tri-phase coordinate systems to 7 times synchronous angular velocity rotating coordinate system is:

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 11 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 11 times of synchronous angular velocity rotating coordinate systems _gd11and i _gq11;

By the net side converter three-phase current signal i collecting _ga, i _gb, i _gcafter the permanent power conversion of static abc tri-phase coordinate systems to 13 times synchronous angular velocity rotating coordinate system, then pass through low pass filter filtering, obtain electric current dq axle component i under 13 times of synchronous angular velocity rotating coordinate systems _gd13and i _gq13;

(5) by first-harmonic control loop outer voltage PI output, obtain first-harmonic control loop current inner loop d shaft current set-point, current inner loop q axle set-point is 0, and its calculating formula is;

$\left\{\begin{array}{c}{i}_{\mathrm{gd}1}^{*}=(K_p+K_i/s)(U_{\mathrm{dc}}^{*}-U_{\mathrm{dc}})\\ i_{\mathrm{gq}1}^{*}=0\end{array}\right.$

Wherein, K _pand K _ibe respectively first-harmonic control loop outer voltage dq axle pi regulator proportionality coefficient and integral coefficient;

(6) adopt the vector control mode of line voltage orientation, by d, q shaft current is given and step (4) obtains i _gd1, i _gq1, by first-harmonic governing equation, obtain d, q axle control voltage u _cd1and u _cq1,

$\left\{\begin{array}{c}{u}_{\mathrm{cd}1}=U_{\mathrm{cd}1}^{\&prime;}+{\mathrm{\&Delta;U}}_{\mathrm{cd}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gd}1}^{*}-i_{\mathrm{gd}1})+\mathrm{\&omega;}{L}_g{i}_{\mathrm{gq}1}+e_{\mathrm{gd}}\\ u_{\mathrm{cq}1}=U_{\mathrm{cq}1}^{\&prime;}+{\mathrm{\&Delta;U}}_{\mathrm{cq}1}=-(K_{p1}+K_{i1}/s)(i_{\mathrm{gq}1}^{*}-i_{\mathrm{gq}1})-\mathrm{\&omega;}{L}_g{i}_{\mathrm{gd}1}\end{array}\right.$

Wherein, K _p1and K _i1be respectively first-harmonic control loop current inner loop dq axle pi regulator proportionality coefficient and integral coefficient; ω is synchronous rotary angular speed, L _gfor reactor inductance;

(7) the fundamental current dq axle calculating is controlled to component of voltage u _cd1and u _cq1via synchronous rotating frame, after the permanent power conversion of static abc tri-phase coordinate systems, obtain fundamental current three phase control voltage u _cabc1;

Wherein: synchronous rotating frame to the permanent power conversion of static abc tri-phase coordinate systems is:

(8) 5,7,11,13 subharmonic current dq axle component set-points are all made as to 0, through 5,7,11,13 subharmonic current governing equations,

$\left\{\begin{array}{c}{u}_{\mathrm{cd}5}=-5\mathrm{\&omega;}{L}_g(K_{p5}+K_{i5}/s)(i_{\mathrm{gq}5}^{*}-i_{\mathrm{gq}5})\\ u_{\mathrm{cq}5}=5\mathrm{\&omega;}{L}_g(K_{p5}+K_{i5}/s)(i_{\mathrm{gd}5}^{*}-i_{\mathrm{gd}5})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{cd}7}=7\mathrm{\&omega;}{L}_g(K_{p7}+K_{i7}/s)(i_{\mathrm{gq}7}^{*}-i_{\mathrm{gq}7})\\ u_{\mathrm{cq}7}=-7\mathrm{\&omega;}{L}_g(K_{p7}+K_{i7}/s)(i_{\mathrm{gd}7}^{*}-i_{\mathrm{gd}7})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{cd}11}=-11\mathrm{\&omega;}{L}_g(K_{p11}+K_{i11}/s)(i_{\mathrm{gq}11}^{*}-i_{\mathrm{gq}11})\\ u_{\mathrm{cq}11}=11\mathrm{\&omega;}{L}_g(K_{p11}+K_{i11}/s)(i_{\mathrm{gd}11}^{*}-i_{\mathrm{gd}11})\end{array}\right.$

$\left\{\begin{array}{c}{u}_{\mathrm{cd}13}=13\mathrm{\&omega;}{L}_g(K_{p13}+K_{i13}/s)(i_{\mathrm{gq}13}^{*}-i_{\mathrm{gq}13})\\ u_{\mathrm{cq}13}=-13\mathrm{\&omega;}{L}_g(K_{p13}+K_{i13}/s)(i_{\mathrm{gd}13}^{*}-i_{\mathrm{gd}13})\end{array}\right.$

Obtain respectively 5,7,11,13 subharmonic bucking voltage dq axle components; Wherein: K _p5, K _p7, K _p11, K _p13and K _i5, K _i7, K _i11, K _i13be respectively 5,7,11,13 subharmonic current control loop dq axle pi regulator proportionality coefficient and integral coefficients;

(9) 5 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd5, u _cq5through 5 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 5 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc5:

7 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd7, u _cq7through 7 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 7 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc7:

11 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd11, u _cq11through 11 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 11 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc11:

13 subharmonic currents are suppressed to required d, q axle harmonic compensation component of voltage u _cd13, u _cq13through 13 times of synchronous angular velocity rotational coordinatess, be tied to the permanent power conversion of static abc tri-phase coordinate systems, obtain 13 subharmonic currents and suppress required harmonic wave three phase control voltage u _cabc13:

(10) first-harmonic is controlled to voltage u _cabc1obtain 5,7,11,13 subharmonic three phase control voltage u with described (9) step _cabc5, u _cabc7, u _cabc11, u _cabc13addition obtains grid side converter and finally controls voltage u _ca, u _cb, u _cc;

(11) will finally control voltage u _ca, u _cb, u _ccafter the modulation of space vector pulse width modulation module, obtain the switching signal of controlling grid side converter.

2. one kind is suppressed full power convertor harmonic current controller for wind-electricity integration, it is characterized in that, comprise voltage hall sensor (3) and current Hall transducer (4), wherein voltage hall sensor (3) is connected with abc/ α β coordinate transformation module (5), described current Hall transducer (4) is connected with harmonic current detection module, the output of described abc/ α β coordinate transformation module (5) is connected with the input of described harmonic current detection module, the output of described harmonic current detection module is connected with respectively first-harmonic control loop (19) and harmonic wave inhibitory control loop, the output of described abc/ α β coordinate transformation module (5) is also connected with the input in harmonic wave inhibitory control loop with described first-harmonic control loop (19), the output of described first-harmonic control loop (19) is connected with the input that synchronous angular velocity rotational coordinates is tied to the permanent power conversion module (20) of static abc tri-phase coordinate systems, the output in this perseverance power conversion module (20) and harmonic wave inhibitory control loop is all connected with the input of adder (22), the output of this adder (22) is connected with the input of space vector pulse width modulation module (2), the output of this space vector pulse width modulation module (2) is connected with the control input end of grid side converter (1),

Described harmonic current detection module comprises synchronously, 5 times, 7 times, 11 times and 13 times of permanent power conversion modules (6～10), the first～five low pass filter (211～215), wherein synchronous, 5 times, 7 times, 11 times are connected with described current Hall transducer (4) respectively with the input of 13 times of permanent power conversion modules (6～10), described synchronous, 5 times, 7 times, 11 times are connected with the input of described the first～five low pass filter (211～215) respectively with 13 times of permanent power conversion modules (6～10) output, the output of the first low pass filter (211) is connected with the input of described first-harmonic control loop (19), the output of the second～five low pass filter (212～215) is connected with the input in described harmonic wave inhibitory control loop,

Described harmonic wave inhibitory control loop comprises 5 times, 7 times, 11 times and 13 subharmonic current control loops (11, 13, 15, 17) and 5 times, 7 times, 11 times, 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module (12 of static abc tri-phase coordinate systems, 14, 16, 18), described 5 times, 7 times, 11 times and 13 subharmonic current control loops (11, 13, 15, 17) input is connected with the output of described the second～five low pass filter (212～215) respectively, described 5 times, 7 times, 11 times and 13 subharmonic current control loops (11, 13, 15, 17) output respectively with described 5 times, 7 times, 11 times, 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module (12 of static abc tri-phase coordinate systems, 14, 16, 18) input connects, described 5 times, 7 times, 11 times, 13 times of synchronous angular velocity rotational coordinatess are tied to the permanent power conversion module (12 of static abc tri-phase coordinate systems, 14, 16, 18) output is connected with the input of described adder (22).

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