CN104362870A - Rectifier control method and device and rectifier - Google Patents

Abstract

The invention relates to the field of electric and electronic technology and nonlinear control and discloses a rectifier control method and device and a rectifier. The rectifier control method includes acquiring expected amplitude Imr of alternating current and sinusoidal alternating voltage ur of six-times power frequency by acquiring input voltage udc, input current idc and output voltage uDC of a DC-DC conversion part of the rectifier, constructing a controller of the DC-DC conversion part according to the EL equation model, and controlling a switch tube of the DC-DC conversion part. The rectifier control method can effectively reduce sudden change of the current of the single-switch three-phase rectifier and prevent current distortion.

Description

Rectifier control method and device and rectifier

Technical Field

The invention relates to the field of power electronic technology and nonlinear control, in particular to a control method and device of a rectifier and the rectifier.

Background

In order to meet the comprehensive performance requirements of the industrial rectifier, research on a unidirectional hybrid three-phase voltage type rectifier is started abroad. The unidirectional hybrid three-phase voltage type rectifier is formed by connecting two rectifiers A, B working in different topological structures and working frequencies in parallel, and supplies power to the same load. The input current of the rectifier A, B is synthesized as a sinusoidal current synchronized to the grid voltage. The rectifier A generally comprises a single-switch three-phase rectifier consisting of a three-phase diode bridge rectifier and a boost type DC/DC converter, and bears most of load power; the rectifier B is a three-phase voltage source type PWM rectifier working at high frequency and bears a small part of load power. In a single-switch three-phase voltage mode rectifier, a single-switch three-phase rectifier a (shown in fig. 1) inputs the current shown in fig. 2. Under the condition that the load power and the voltage thereof are known, according to the three-phase alternating current voltage u and the power balance of the alternating current side and the direct current side, the expected alternating current sinusoidal current of the unidirectional mixed three-phase voltage type rectifier synchronous with the three-phase alternating current voltage can be obtained. According to the unit work of the network side of the unidirectional mixed three-phase voltage type rectifierRate factor and requirement for low harmonics of AC current when u_aThe desired grid-side ac current is iar ═ Imrsin ω t, and Imr can be calculated from the ac-side to load power balance. Taking the a-phase as an example, iar ═ idar + iar (iar, idar and iar are respectively the desired phase currents of the three-phase voltage-type rectifier and the rectifiers a and B), and idr is the desired current on the dc side, as shown in fig. 3, since the desired input current idar of the rectifier a has an abrupt change, and the desired current iar of the rectifier B must have an abrupt change, the rectifier B cannot track the desired current having the abrupt change and distort the input current (as indicated by the dashed circle in fig. 3). Therefore, when the desired ac sinusoidal current of the single-phase hybrid three-phase voltage-type rectifier is known, minimizing the number of sudden changes of the desired current of the rectifiers a and B is a problem that needs to be solved urgently to realize the ac sinusoidal current of the single-phase hybrid three-phase voltage-type rectifier.

Disclosure of Invention

The invention provides a rectifier control method and device and a rectifier, and solves the technical problem that in the prior art, the sudden change of input current of a single-switch three-phase rectifier is large.

The purpose of the invention is realized by the following technical scheme:

a method of controlling a rectifier, comprising:

obtaining input voltage u of DC-DC conversion part of rectifier_dcInput current i_dcOutput voltage u_DC；

Obtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

Controlling a switching tube of the DC-DC conversion part according to a controller which establishes the DC-DC conversion part based on an EL equation model, wherein the controller is a passive controller based on the EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

A control device for a rectifier, comprising:

a first obtaining module for obtaining an input voltage u of the DC-DC conversion part of the rectifier_dcInput current i_dcOutput voltage u_DC

A second obtaining module for obtaining the amplitude I of the desired alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

The control module is used for establishing a controller of the DC-DC conversion part according to an EL equation model and controlling a switching tube of the DC-DC conversion part, wherein the controller is a passive controller based on the EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

A rectifier comprises a three-phase diode bridge rectifier, a DC/DC converter and a controller of the rectifier, wherein the controller of the rectifier is used for acquiring an input voltage u of a DC-DC conversion part of the rectifier_dcInput current i_dcOutput voltage u_DC(ii) a Obtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r(ii) a Controlling a switching tube of the DC-DC conversion part according to a controller which establishes the DC-DC conversion part based on an EL equation model, wherein the controller is a passive controller based on the EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

According to the control method and device of the rectifier and the rectifier provided by the invention, the input voltage u of the DC-DC conversion part of the rectifier is obtained_dcInput current i_dcOutput voltage u_DCObtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_rAnd a controller of the DC-DC conversion part is established according to an EL equation model, and a switching tube of the DC-DC conversion part is controlled. The current sudden change of the single-switch three-phase rectifier can be effectively reduced, and the current distortion is prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a circuit diagram of a single switch three phase rectifier in a single direction hybrid three phase voltage mode rectifier;

FIG. 2 is a waveform diagram of an input current of a single-switch three-phase rectifier according to an embodiment of the present invention;

FIG. 3 is a waveform diagram of the a-phase voltage, current and DC side current at the AC side of rectifiers A and B;

FIG. 4 is a waveform diagram of the a-phase voltage, current and DC-side current at the AC side of the rectifiers A and B after applying the solution of the embodiment of the present invention;

fig. 5 is a circuit diagram of a single-switch three-phase rectifier provided in an embodiment of the present invention;

fig. 6 is a flowchart of a control method of a rectifier according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a control device of a rectifier according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

In order to realize the current waveform shown in fig. 4, a single-switch three-phase rectifier circuit structure shown in fig. 5 is adopted, and fig. 5 is different from fig. 1 in that three small inductors La are added on the alternating current side. In the circuit diagram of the single-switch three-phase rectifier provided in the embodiment of the invention, as shown in fig. 5, the single-switch three-phase rectifier comprises two parts, namely a three-phase diode bridge rectifier and a DC/DC converter, respectively, and the input voltage of the converter is u_dcInput current is i_dcOutput voltage of u_DCThe driving voltage of the switch tube T is u_g，

Based on the circuit diagram shown in FIG. 5, the driving voltage u is applied_gFor example, a method for controlling a rectifier according to an embodiment of the present invention is described, and as shown in fig. 6, the method includes the following steps:

step 601, obtaining an input voltage u of a DC-DC conversion part of a rectifier_dcInput current i_dcOutput voltage u_DC；

Step 602, obtaining an amplitude I of the desired AC current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

Wherein the desired AC current amplitude I_mrObtained by load power balance calculation of an alternating current side, the power frequency of 6 timesSinusoidal ac voltage u of_rBy u_dcObtained by a band-pass filter. To realize a direct side current i_dcIn sinusoidal pulsation, the desired current i in sinusoidal pulsation is obtained_dr. Due to i_dcIs formed by combining three-phase alternating currents of a single-switch three-phase rectifier, if i can be controlled_dcTracing i_drThe current shown in fig. 4 can be realized. Due to u_dcWith the desired i_drWith the same ripple frequency, in order to obtain a desired current i in sinusoidal ripple_drThe required sine alternating current of 6 times of power frequency is firstly measured by u_dcObtaining u by a band-pass filter_r。

Step 603, establishing a controller of the DC-DC conversion part according to the EL equation model, and controlling a switching tube of the DC-DC conversion part.

Wherein the controller is a passive controller based on an EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g. Input current i_dcIs expected value i_drFrom the formula i_dr＝0.5I_mr+Ku_rObtaining, wherein K is an adjustable positive number.

In order to obtain a passive control strategy of the rectifier based on an EL equation (Euler-Lagrange, Euler-Lagrange equation), step 603 requires a controller of the rectifier to be established according to a mathematical model of an EL equation model, and specifically includes the following steps:

603-1, obtaining KVL and KCL equations according to kirchhoff's law;

wherein, KVL equation isEquation of KCL asWherein R is_LThe DC side equivalent load is C, and the DC side capacitance is C.

Step 603-2, transforming the KVL and KCL equations into an EL equation model;

wherein the EL equation model is <math> <mrow> <mi>M</mi> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mo>+</mo> <mi>Jx</mi> <mo>+</mo> <mi>Rx</mi> <mo>=</mo> <mi>u</mi> <mo>,</mo> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mo>=</mo> <mfenced open='(' close=')'> <mtable> <mtr> <mtd> <mfrac> <msub> <mi>di</mi> <mi>dc</mi> </msub> <mi>dt</mi> </mfrac> </mtd> </mtr> <mtr> <mtd> <mfrac> <msub> <mi>du</mi> <mi>DC</mi> </msub> <mi>dt</mi> </mfrac> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mi>M</mi> <mo>=</mo> <mfenced open='(' close=')'> <mtable> <mtr> <mtd> <mn>2</mn> <mi>L</mi> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mi>C</mi> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mi>J</mi> <mo>=</mo> </mrow> </math> $\left(\begin{array}{cc}0& 1-u_g\\ u_g-1& 0\end{array}\right),x=\left(\begin{array}{c}{i}_{\mathrm{dc}}\\ u_{\mathrm{DC}}\end{array}\right),R=\left(\begin{array}{cc}0& 0\\ 0& \frac{1}{R_L}\end{array}\right).$

Step 603-3, injecting damping into the EL equation model $R_a=\left(\begin{array}{cc}{r}_{a1}& 0\\ 0& \frac{1}{r_{a2}}\end{array}\right),$ To obtain a control law of the controller;

wherein, an input current i is set_dcThe desired current vector is x_rError current vector x_e＝x_r-x. The EL equation is modeled as <math> <mrow> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mo>+</mo> <mi>J</mi> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>+</mo> <mi>R</mi> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>=</mo> <mo>-</mo> <mi>u</mi> <mo>+</mo> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>r</mi> </msub> <mo>+</mo> <mi>J</mi> <msub> <mi>x</mi> <mi>r</mi> </msub> <mo>+</mo> <mi>R</mi> <msub> <mi>x</mi> <mi>r</mi> </msub> <mo>,</mo> </mrow> </math> Error energy function ofThe passive controller based on the EL equation has good steady-state performance, but the convergence speed is slow, in order to accelerate the system convergence speed, damping is injected into the controller, so that an error energy function is quickly changed into zero, and damping injection R is adopted_dx_e＝(R+R_a)x_e，R_aIn order to damp the injection matrix, $R_a=$ $\left(\begin{array}{cc}{r}_{a1}& 0\\ 0& \frac{1}{r_{a2}}\end{array}\right),$ r_a1＞0，r_a2is greater than 0. When a damping injection matrix is introduced, it becomes <math> <mrow> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mo>-</mo> <mi>u</mi> <mo>+</mo> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>r</mi> </msub> <mo>+</mo> <mi>Jx</mi> <mo>+</mo> <mi>R</mi> <msub> <mi>x</mi> <mi>r</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>a</mi> </msub> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>-</mo> <msub> <mi>R</mi> <mi>d</mi> </msub> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>,</mo> </mrow> </math> Deriving an energy error function <math> <mrow> <msub> <mover> <mi>H</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mi>x</mi> <mi>e</mi> <mi>T</mi> </msubsup> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mo>,</mo> </mrow> </math> <math> <mrow> <msub> <mover> <mi>H</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mi>x</mi> <mi>e</mi> <mi>T</mi> </msubsup> <mrow> <mo>(</mo> <mo>-</mo> <mi>u</mi> <mo>+</mo> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>r</mi> </msub> <mo>+</mo> <mi>Jx</mi> <mo>+</mo> <mi>R</mi> <msub> <mi>x</mi> <mi>r</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>a</mi> </msub> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>-</mo> <msub> <mi>R</mi> <mi>d</mi> </msub> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math> Let the control law of the controller be <math> <mrow> <mi>u</mi> <mo>=</mo> <mi>M</mi> <msub> <mover> <mi>x</mi> <mo>&CenterDot;</mo> </mover> <mi>r</mi> </msub> <mo>+</mo> <mi>Jx</mi> <mo>+</mo> <mi>R</mi> <msub> <mi>x</mi> <mi>r</mi> </msub> <mo>-</mo> <msub> <mi>R</mi> <mi>a</mi> </msub> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>,</mo> </mrow> </math> The derivative of the energy error function with respect to time <math> <mrow> <msub> <mover> <mi>H</mi> <mo>&CenterDot;</mo> </mover> <mi>e</mi> </msub> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>-</mo> <msubsup> <mi>x</mi> <mi>e</mi> <mi>T</mi> </msubsup> <mrow> <mo>(</mo> <mi>R</mi> <mo>+</mo> <msub> <mi>R</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> <msub> <mi>x</mi> <mi>e</mi> </msub> <mo>&lt;</mo> <mn>0</mn> <mo>,</mo> </mrow> </math> So that H_e(x)→0，x→x_r；

Step 603-4, establishing a controller of the rectifier according to the control law of the controller, wherein the output of the controller of the rectifier <math> <mrow> <msub> <mi>u</mi> <mi>g</mi> </msub> <mo>=</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mrow> <msub> <mi>u</mi> <mi>dc</mi> </msub> <mo>+</mo> <msub> <mi>r</mi> <mrow> <mi>a</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mi>dr</mi> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>dc</mi> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mi>L</mi> <msub> <mover> <mi>i</mi> <mo>&CenterDot;</mo> </mover> <mi>dr</mi> </msub> </mrow> <msub> <mi>u</mi> <mi>DC</mi> </msub> </mfrac> <mo>.</mo> </mrow> </math>

Wherein, under the control law of the controller, the rectifier can realize the control target and adjust R_aCan adjust H_e(x) To a speed of 0. The driving voltage of the switching tube for realizing the control target can be obtained by the control law <math> <mrow> <msub> <mi>u</mi> <mi>g</mi> </msub> <mo>=</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mrow> <msub> <mi>u</mi> <mi>dc</mi> </msub> <mo>+</mo> <msub> <mi>r</mi> <mrow> <mi>a</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mi>dr</mi> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>dc</mi> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mi>L</mi> <msub> <mover> <mi>i</mi> <mo>&CenterDot;</mo> </mover> <mi>dr</mi> </msub> </mrow> <msub> <mi>u</mi> <mi>DC</mi> </msub> </mfrac> <mo>.</mo> </mrow> </math>

The control method of the rectifier provided by the invention obtains the input voltage u of the DC-DC conversion part of the rectifier_dcInput current i_dcOutput voltage u_DCObtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_rAnd a controller of the DC-DC conversion part is established according to an EL equation model, and a switching tube of the DC-DC conversion part is controlled. The current sudden change of the single-switch three-phase rectifier can be effectively reduced, and the current distortion is prevented.

An embodiment of the present invention further provides a control device of a rectifier, as shown in fig. 7, including:

a first obtaining module 710 for obtaining an input voltage u of the rectifier DC-DC converting part_dcInput current i_dcOutput voltage u_DC

A second obtaining module 720 for obtaining the desired amplitude I of the AC current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

A control module 730 for controlling the switching tube of the DC-DC conversion part according to the controller based on the EL equation modelWherein the controller is a passive controller based on an EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

Wherein the second obtaining module 720 includes:

a current calculating unit 721 for calculating a current according to I_mrAnd u_rObtaining the i_drWherein i is_dr＝0.5I_mr+Ku_r；

A load power calculating unit 722 for calculating and obtaining the amplitude I of the desired AC current according to the load power balance of the AC side_mr；

A filtering unit 723 for filtering u_dcFiltering out the sinusoidal alternating voltage u of 6 times of power frequency_r

The embodiment of the invention also provides a rectifier which comprises a three-phase diode bridge rectifier, a DC/DC converter and a controller of the rectifier, wherein the controller of the rectifier is used for acquiring the input voltage u of the DC-DC conversion part of the rectifier_dcInput current i_dcOutput voltage u_DC(ii) a Obtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r(ii) a Controlling a switching tube of the DC-DC conversion part according to a controller which establishes the DC-DC conversion part based on an EL equation model, wherein the controller is a passive controller based on the EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining ra1 as injection damping, and the output of the controller is the driving voltage u of the switching tube_g。

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary hardware platform, and certainly may be implemented by hardware, but in many cases, the former is a better embodiment. With this understanding in mind, all or part of the technical solutions of the present invention that contribute to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments or some parts of the embodiments of the present invention.

The present invention has been described in detail, and the principle and embodiments of the present invention are explained herein by using specific examples, which are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (7)

1. A method of controlling a rectifier, comprising:

obtaining input voltage u of DC-DC conversion part of rectifier_dcInput current i_dcOutput voltage u_DC；

Obtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

Controlling a switching tube of the DC-DC conversion part according to a controller which establishes the DC-DC conversion part based on an EL equation model, wherein the controller is based on EA passive controller of an L equation model, wherein the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

2. Method according to claim 1, characterized in that the input current i_dcIs expected value i_drFrom the formula i_dr＝0.5I_mr+Ku_rObtaining, wherein K is an adjustable positive number.

3. The method of claim 1, wherein the desired alternating current has a magnitude I_mrThe sine alternating voltage u is obtained by load power balance calculation of an alternating current side and is 6 times of the power frequency_rBy u_dcObtained by a band-pass filter.

4. The method of claim 2, wherein the controller for building the DC-DC conversion portion according to the EL equation based model comprises:

obtaining KVL and KCL equations according to kirchhoff's law, wherein the KVL equation is $2L\frac{{\mathrm{di}}_{\mathrm{dc}}}{\mathrm{dt}}+(1-u_g)u_{\mathrm{DC}}-u_{\mathrm{dc}}=0,$ KCL equation is $C\frac{{\mathrm{dc}}_{\mathrm{DC}}}{\mathrm{dt}}+(u_g-1)i_{\mathrm{dc}}+\frac{1}{R_L}{u}_{\mathrm{DC}}=0,$ Wherein R is_LThe direct current side equivalent load is C, and the direct current side capacitor is C;

transforming the KVL and KCL equations into an EL equation model $M\stackrel{.}{x}+\mathrm{Jx}+\mathrm{Rx}=u,$ Wherein, $\stackrel{.}{x}$ $=\left(\begin{array}{c}\frac{{\mathrm{di}}_{\mathrm{dc}}}{\mathrm{dt}}\\ \frac{{\mathrm{du}}_{\mathrm{DC}}}{\mathrm{dt}}\end{array}\right),M=\left(\begin{array}{cc}2L& 0\\ 0& C\end{array}\right),J=\left(\begin{array}{cc}0& 1-u_g\\ u_g-1& 0\end{array}\right),x=\left(\begin{array}{c}{i}_{\mathrm{dc}}\\ u_{\mathrm{DC}}\end{array}\right),R=\left(\begin{array}{cc}0& 0\\ 0& \frac{1}{R_L}\end{array}\right);$

injecting damping into the EL equation model $R_a=\left(\begin{array}{cc}{r}_{a1}& 0\\ 0& \frac{1}{r_{a2}}\end{array}\right),$ To obtain a control law of the controller;

establishing a controller of the rectifier according to the control law of the controller, wherein the output of the controller of the rectifier $u_g=1-\frac{u_{\mathrm{dc}}+r_{a1}(i_{\mathrm{dr}}-i_{\mathrm{dc}})-L{\stackrel{.}{i}}_{\mathrm{dr}}}{u_{\mathrm{DC}}}.$

5. A control device for a rectifier, comprising:

a first obtaining module for obtaining input power of the DC-DC conversion part of the rectifierPress u_dcInput current i_dcOutput voltage u_DC

A second obtaining module for obtaining the amplitude I of the desired alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r；

The control module is used for establishing a controller of the DC-DC conversion part according to an EL equation model and controlling a switching tube of the DC-DC conversion part, wherein the controller is a passive controller based on the EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。

6. The apparatus of claim 5, wherein the second obtaining module comprises:

a current calculating unit for calculating a current according to I_mrAnd u_rObtaining the i_drWherein i is_dr＝0.5I_mr+Ku_r；

A load power calculation unit for calculating the amplitude I of the desired AC current according to the load power balance on the AC side_mr；

A filtering unit for filtering u_dcFiltering out the sinusoidal alternating voltage u of 6 times of power frequency_r。

7. Rectifier comprising a three-phase diode bridge rectifier, a DC/DC converter and a rectifier controller, wherein the rectifier controller is adapted to obtain an input voltage u of the rectifier DC-DC conversion section_dcInput current i_dcOutput voltage u_DC(ii) a Obtaining the desired amplitude I of the alternating current_mrAnd 6 times of power frequency sinusoidal AC voltage u_r(ii) a A controller for establishing a DC-DC conversion part based on an EL equation model, and an on/off control circuit for the DC-DC conversion partControlling by closing the tube, wherein the controller is a passive controller based on an EL equation model, and the input of the controller of the rectifier is u_dc、i_dc、u_DC、i_drAnd r_a1，i_drFor an input current i_dcIs the expected value of i_drFrom I_mrAnd u_rObtaining of_a1For injecting damping, the output of the controller is the driving voltage u of the switching tube_g。