CN104362872B - Voltage type PWM (pulse-width modulation) rectifier, and method and device for controlling voltage type PWM rectifier - Google Patents
Voltage type PWM (pulse-width modulation) rectifier, and method and device for controlling voltage type PWM rectifier Download PDFInfo
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Abstract
The invention relates to the field of power electronic technologies and nonlinear control application, and discloses a voltage type PWM (pulse-width modulation) rectifier, and a method and a device for controlling the voltage type PWM rectifier. The method includes acquiring three-phase line voltages, three-phase currents and direct-current output voltages of an alternating-current side of the rectifier; acquiring expected currents i<*>d and i<*>q and expected direct-current voltages u<*>DC of the three-phase currents in shafts d and q; controlling the rectifier according to a rectification controller under the imbalance condition of a power grid. The rectification controller is built on the basis of an EL (Euler-Lagrange) formula model. The voltage type PWM rectifier, the method and the device have the advantages that all harmonic waves in input currents of the rectifier can be eliminated or suppressed only by the aid of real-time values of the voltages and the currents, accordingly, the voltage type PWM rectifier and the device are simple in structure, and the performance can be obviously improved.
Description
Technical Field
The invention relates to the field of power electronic technology and nonlinear control application, in particular to a control method and device of a voltage type PWM rectifier and the voltage type PWM rectifier.
Background
The voltage type PWM rectifier has the advantages of network side current sine, unit power factor, energy bidirectional flow and constant direct current voltage control, and is widely applied to the industry. The advantages of the voltage-type PWM rectifier are generally obtained by utilizing various linear control strategies and nonlinear control strategies under the premise of assuming the balance of a power grid. In practical applications, the voltage type PWM rectifier works in an unbalanced state, especially, the grid voltage is unbalanced, which causes the existence of ac negative sequence current and negative sequence voltage, so that odd harmonics will appear in the ac current, even harmonics will appear in the dc voltage, and the performance of the rectifier is adversely affected.
Since the rectifier works in a balanced or unbalanced state of the grid, various solutions have been proposed in the prior art to improve the performance of the rectifier. For example: firstly, a current loop in a two-phase static alpha beta coordinate system adopts a rectifier unbalance control strategy of an internal model controller, thereby not only realizing the no-difference tracking control of positive and negative sequence currents, but also enabling the system to obtain strong robustness. Second, the use of dual current regulators in the positive and negative rotating synchronous frame avoids the need for a full band filter to extract the positive and negative sequence components, and the use of a resonant-gain path in the current regulators reduces steady state errors. And thirdly, obtaining a current control instruction under a positive and negative sequence dq coordinate system through the relation of voltage, current and power, and controlling by adopting a PI regulator.
The control strategy in the prior art researches the rectifier current control problem from different angles, and for a rectifier with nonlinear property controlled by a linear controller (such as a PI (proportional integral), a proportional resonant controller and a generalized integrator), the control structure of the rectifier is complex and the performance is poor. For a nonlinear controller (such as an active disturbance rejection and a sliding mode variable structure), the control algorithm is complex, and calculation delay is caused; for power control, the above problems also exist when a linear controller is used, and when a power meter is used, the switching frequency is uncertain, which brings difficulty to the design of the alternating current filter reactor. The current control circuit aims at the problems of the current control of the existing rectifier.
Disclosure of Invention
The invention provides a voltage type PWM rectifier control method and device and a voltage type PWM rectifier, and solves the technical problems that in the prior art, a rectifier control structure is complex, performance is poor, and harmonic waves appear in input current.
The purpose of the invention is realized by the following technical scheme:
a control method of a voltage type PWM rectifier comprises the following steps:
obtaining three-phase line voltage u of AC side of rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC；
Obtaining expected current i of three-phase current on dq axis* d、i* qAnd a desired DC voltage u* DC；
Controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, wherein the model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on the EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is the switching functions Sa, Sb, Sc in the three-phase stationary coordinate system.
A control apparatus for a voltage-mode PWM rectifier, comprising:
a first obtaining module for obtaining the three-phase line voltage u at the AC side of the rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC；
A second obtaining module for obtaining the expected current i of the three-phase current on the dq axis* d、i* qAnd a desired DC voltage u* DC；
The control module is used for controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, wherein the model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on the EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is the switching functions Sa, Sb, Sc in the three-phase stationary coordinate system.
A voltage type PWM rectifier comprises a rectifier and a rectification controller, wherein the rectification controller is used for obtaining three-phase line voltage u on the AC side of the rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC(ii) a Obtaining expected current i of three-phase current on dq axis* d、i* qAnd a desired DC voltage u* DC(ii) a Controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, wherein the model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on the EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is a switching function S under a three-phase static coordinate systema、Sb、Sc。
According to the voltage type PWM rectifier and the control method and device thereof, provided by the invention, the expected current i of the three-phase current on the dq axis is obtained by obtaining the three-phase line voltage, the three-phase current and the direct current output voltage on the alternating current side of the rectifier* d、i* qAnd a desired DC voltage u* DCAnd controlling the rectifier under the condition of power grid unbalance according to a rectification controller established based on an EL equation model. All harmonic waves in the input current of the rectifier can be eliminated or suppressed only by the real-time values of the voltage and the current, the structure is simple, and the performance is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used 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 inventive exercise.
Fig. 1 is a main circuit structure diagram of a voltage-type PWM rectifier according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a voltage-type PWM rectifier according to an embodiment of the present invention;
fig. 3 is a flow chart of the establishment of the commutation controller according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device of a voltage-type PWM rectifier according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a voltage-type PWM 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.
Fig. 1 is a structural diagram of a main circuit of a voltage-type PWM rectifier provided in an embodiment of the present invention, and the main circuit of the three-phase voltage-type PWM rectifier is as shown in fig. 1 under the assumption that parameters of filters on a network side are the same and no loss occurs in a switching device. When the power grid is unbalanced, three-phase voltage ua+ub+ucNot equal to 0; the current satisfies ia+ib+ic＝0；Sa+Sb+Sc≠0(Sa、Sb、ScAs a function of the drive switch of each phase bridge arm, Si1 represents that the upper bridge arm is on and the lower bridge arm is off; siWhen the upper bridge arm is turned off, the lower bridge arm is turned on; i ═ a, b, c). From fig. 1, a mathematical model of a rectifier with line voltage, line switching value, ac current and dc voltage as variables can be obtained as follows:
Sab、Sbc、Scaas a function of the line switch, Sab＝Sa-Sb、Sbc＝Sb-Sc、Sca＝Sc-Sa，uab、ubc、ucaFor the line voltage of the power grid, the three-phase current is ia、ib、ic，uDCIs a dc output voltage.
Based on the application scenario shown in fig. 1, a control method of a voltage-type PWM rectifier provided in an embodiment of the present invention is described by taking control of a driving switching function as an example, as shown in fig. 2, the method includes the following steps:
step 201, acquiring a three-phase line voltage, a three-phase current and a direct current output voltage at an alternating current side of a rectifier;
wherein, the voltage sensor can be used to obtain the three-phase line voltage u on the AC side of the rectifierab、ubc、ucaAnd a DC output voltage uDCObtaining three-phase current i by means of current sensora、ib、ic；
202, acquiring expected current and expected direct-current voltage of three-phase current under a two-phase synchronous rotating coordinate system;
wherein i* d、i* qThe DC voltage is equal to the given voltage for the expected current in the two-phase synchronous rotating coordinate systemThe desired requirement is i* d＝Im(to balance amplitude of AC phase current for steady state operation), i* q＝0、u* DCIs a constant value. u. of* DCTo meet the load requirements and(Ummagnitude to balance the ac phase voltages for the grid). According to the AC-DC side power balance (neglecting switching losses), ImIs calculated byIs of the formulau* DCDesired DC output voltage, R is filter resistance, RLFor equivalent DC load, uldThe line voltage is under a two-phase synchronous rotating coordinate system.
And 203, controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model.
The model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on an EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is the switching functions Sa, Sb, Sc in the three-phase stationary coordinate system.
The embodiment of the invention provides a control method of a voltage type PWM (pulse-width modulation) rectifier, which is used for acquiring three-phase line voltage, three-phase current and direct-current output voltage at the alternating current side of the rectifier to acquire expected current i of the three-phase current on a dq axis* d、i* qAnd a desired DC voltage u* DCAnd controlling the rectifier under the condition of power grid unbalance according to a rectification controller established based on an EL equation model. All harmonic waves in the input current of the rectifier can be eliminated or suppressed only by the real-time values of the voltage and the current, the structure is simple, and the performance is obviously improved.
Before step 201 of the embodiment of the present invention, a rectification controller needs to be established in advance, and the following process of establishing the rectification controller is described in detail, and as shown in fig. 3, an establishment flowchart of the rectification controller includes the following steps:
step 301, carrying out three-phase line current i on the alternating current side of the rectifiera、ib、icPerforming Park transformation to obtain two-phase synchronous rotation coordinatesUnder-system AC side current id、iq；
Wherein, according to the matrix
To ia、ib、icPerforming Park conversion to obtain alternating side current i under a two-phase synchronous rotating coordinate systemd、iq，
Step 302, a line switching function S of the rectifier under a three-phase static coordinate systemab、Sbc、ScaAnd three phase line voltage uab、ubc、ucaPerforming Park transformation to obtain a switching function S under a two-phase synchronous rotating coordinate systemld、SlqAnd an AC side voltage uld、ulq；
Wherein, according to the matrixFor the switching function Sab、Sbc、ScaAnd three phase line voltage uab、ubc、ucaPerforming Park transformation to obtain a switching function S under a two-phase synchronous rotating coordinate systemld、SlqAnd an AC side voltage uld、ulq。
Wherein, the steps 301-302 have no sequence.
Step 303, id、iq、uld、ulq、Sld、SlqSubstituted intoThe mathematical model of the rectifier under a three-phase static coordinate system is used for obtaining the mathematical model of the rectifier under a two-phase synchronous rotating coordinate system;
wherein, i isd、iq、uld、ulq、Sld、SlqSubstituting the two-phase synchronous rotation coordinate system into the formula (1) to obtain a mathematical model of the rectifier under the two-phase synchronous rotation coordinate systemIn the formula (4), id、iqThe components of the alternating current on d and q axes; sld、SlqComponents of the line switching function on d and q axes; u. ofld、ulqThe components of the grid voltage on the d and q axes are shown.
And step 304, establishing the rectification controller according to an EL equation model and a mathematical model of the rectifier under a two-phase synchronous rotating coordinate system.
In order to obtain a passive control strategy of the rectifier based on an EL equation (Euler-Lagrange equation) in step 405, a rectification controller needs to be established according to an EL equation model and a mathematical model of the rectifier under a two-phase synchronous rotating coordinate system, and the method specifically includes the following steps:
step 305-1, converting a mathematical model of the rectifier under a two-phase synchronous rotating coordinate system into an EL equation model;
wherein the formula (4) is converted into an EL modelIn the formula (5)The derivative of x with respect to time is represented,in the form of an anti-symmetric matrix,
305-2, injecting damping into an EL equation model to obtain a control law of the rectification controller;
wherein, the expected current vector of the rectifier is x*Error current vector xe＝x-x*. The formula (5) is changed intoError energy function of
The 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 adopteddxe＝(R+Ra)xe，RaIn order to damp the injection matrix,ra1、ra2、ra3for settable normal numbers, when a damping injection matrix is introduced, equation (6) becomesDeriving an energy error function Let the control law of the controller beThe derivative of the energy error function with respect to timeSo that He(x)→0，x→x*Under the action of the formula (7), the rectifier can achieve the control target and adjust RaCan adjust He(x) To a speed of 0. From equation (7), the line switching function to achieve the control objective can be obtained
Formula (8), ra1、ra2In order to provide for the damping of the injection,is idIs calculated from the expected value of (c). When the three-phase voltage type PWM rectifier operates in a steady state under the condition of unbalanced power grid, the current on the grid side is sinusoidal, the expected power factor is 1, and the direct-current voltage is equal to the given voltageThen(ImAmplitude for balancing AC phase current for steady state operation
And 305-3, establishing a rectification controller according to the control law of the rectification controller.
Wherein the output of the rectification controller is switching functions Sa, Sb and Sc,
△S＝Sa+Sb+Scwherein, first, S is passedldAnd SlqCarrying out inverse transformation from dq0 to abc to obtain line switch functions Sab, Sbc and Sca in a three-phase static coordinate system,
Sab＝Sldsin(ωt+30°)+Slqcos(ωt+30°)，Sbc＝Sldsin(ωt-90°)+Slqcos(ωt-90°)，
Sca＝Sldsin(ωt+150°)+Slqcos(ωt+150°)，Sab、Sbc、Scafrom SldAnd SlqThe inverse transformation of dq0 to abc is performed, and formula (10) is substituted into formula (1) to obtainWherein △ u is ua+ub+uc。
To overcome the effect of △ u on the AC current, according to equation (10), one can choose to do soThen there is
The PWM signal obtained from equation (12) can be implemented when the grid is unbalanced, and when the passive current controller ensures that the ac current is sinusoidal, the grid voltage imbalance must cause the imbalance of the switching function, i.e., the imbalance of the input voltage of the rectifier compensates the imbalance of the grid voltage.
An embodiment of the present invention provides a control device for a voltage-type PWM rectifier, as shown in fig. 4, including:
a first obtaining module 410, configured to obtain a three-phase line voltage u at an ac side of the rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC；
A second obtaining module 420 for obtaining the expected current i of the three-phase current in the dq axis* d、i* qAnd a desired DC voltage u* DC；
A control module 430, configured to control the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, where the model of the rectifier is a mathematical model in a three-phase stationary coordinate system, the rectification controller is a passive controller based on the EL equation model, and an input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is the switching functions Sa, Sb, Sc in the three-phase stationary coordinate system.
Wherein the control module comprises:
a first transformation unit 431, configured to transform the three-phase line current i on the ac side of the rectifier acquired by the first acquisition modulea、ib、icConverted into alternating side current i under two-phase synchronous rotating coordinate systemd、iq；
A second transformation unit 432, configured to transform the three-phase line voltage u on the ac side of the rectifier obtained by the first obtaining moduleab、ubc、ucaConverted into AC side voltage u under two-phase synchronous rotating coordinate systemld、ulq；
A damping input unit 433 for inputting a damping ra1、ra2；
A current calculating unit 434 for calculating a current according to the line voltage u in the two-phase synchronous rotating coordinate systemldEquivalent DC load, input resistor R, desired DC output voltage u* DCExpected current i in two-phase synchronous rotating coordinate system* d；
A process control unit 435 for controlling the process according to id、iq、uld、ulq、ra1、ra2、uDC、Calculating the outgoing line switch function Sab、Sbc、ScaAccording to the line switch functions Sab, Sbc, ScaAnd calculating switching functions Sa, Sb and Sc, and controlling the rectifier under the condition of unbalanced power grid through the switching functions Sa, Sb and Sc.
Wherein the processing control unit 435 includes:
a calculation subunit 4351 for calculating according to id、iq、uld、ulq、ra1、ra2、uDC、Calculating a line switch function under a two-phase synchronous rotating coordinate system
Control output subunit 4352 for pair SldAnd SlqPerforming Park inverse transformation to obtain line switch functions Sab, Sbc and Sca under a three-phase static coordinate system;
the control execution subunit 4353 is configured to calculate switching functions Sa, Sb, and Sc according to the line switching functions Sab, Sbc, and Sca, and control the rectifier according to the switching functions Sa, Sb, and Sc when the power grid is unbalanced.
The embodiment of the present invention further provides a voltage-type PWM rectifier, as shown in fig. 5, which includes a rectifier 510 and a rectification controller 520, wherein the rectification controller 520 is configured to obtain three-phase lines on an ac side of the rectifierVoltage uab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC(ii) a Obtaining expected current i of three-phase current on dq axis* d、i* qAnd a desired DC voltage u* DC(ii) a Controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, wherein the model of the rectifier is a mathematical model under a three-phase static coordinate system, the rectification controller is a passive controller based on the EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is the switching functions Sa, Sb, Sc in the three-phase stationary coordinate system.
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 (2)
1. A control method of a voltage type PWM rectifier is characterized by comprising the following steps:
obtaining three-phase line voltage u of AC side of rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC；
Obtaining expected current i of three-phase current on dq axis* d、i* qAnd a desired DC voltage u* DC；
Modeling based on EL equationThe rectifier is controlled by a vertical rectification controller under the condition of unbalanced power grid, wherein a model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on an EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is switching functions Sa, Sb and Sc under a three-phase static coordinate system;
the establishing of the rectification controller according to the EL equation model and the mathematical model of the rectifier under the two-phase synchronous rotating coordinate system comprises the following steps:
converting a mathematical model of the rectifier under a two-phase synchronous rotating coordinate system into an EL equation model;
injecting damping into an EL equation model to obtain a control law of the rectification controller;
establishing a rectification controller according to the control law of the rectification controller, wherein the output of the rectification controller
Sa＝(1/3)*(Sab-Sca+△S)、
Sb＝(1/3)*(Sbc-Sab+△S)、
Sc＝(1/3)*(Sca-Sbc+△S)，△S＝Sa+Sb+Sc，
Wherein,
Sab＝Sldsin(ωt+30°)+Slqcos(ωt+30°)，
Sbc＝Sldsin(ωt-90°)+Slqcos(ωt-90°)，
Sca＝Sldsin(ωt+150°)+Slqcos(ωt+150°)，
ra1、ra2in order to provide for the damping of the injection,is idThe expected value of (d); the L is inductance, the R is resistance of the filter, the omega is angular frequency, and the t is time; the rectification controller established based on the EL equation model comprises:
for three-phase line current i at AC side of the rectifiera、ib、icPerforming Park conversion to obtain alternating side current i under a two-phase synchronous rotating coordinate systemd、iq；
Line switching function S of the rectifier in a three-phase stationary coordinate systemab、Sbc、ScaAnd three phase line voltage uab、ubc、ucaPerforming Park transformation to obtain a switching function S under a two-phase synchronous rotating coordinate systemld、SlqAnd an AC side voltage uld、ulq；
Will id、iq、uld、ulq、Sld、SlqSubstituting the mathematical model of the rectifier under a three-phase static coordinate system to obtain the mathematical model of the rectifier under a two-phase synchronous rotating coordinate system;
and establishing the rectification controller according to an EL equation model and a mathematical model of the rectifier under a two-phase synchronous rotating coordinate system.
2. A control apparatus for a voltage-mode PWM rectifier, comprising:
a first obtaining module for obtaining the three-phase line voltage u at the AC side of the rectifierab、ubc、ucaThree-phase current ia、ib、icAnd a DC output voltage uDC；
A second obtaining module for obtaining the expected current i of the three-phase current on the dq axis* d、i* qAnd a desired DC voltage u* DC；
The control module is used for controlling the rectifier under the condition of unbalanced power grid according to a rectification controller established based on an EL equation model, wherein the model of the rectifier is a mathematical model under a two-phase synchronous rotating coordinate system, the rectification controller is a passive controller based on the EL equation model, and the input of the rectification controller is uab、ubc、uca、ia、ib、ic、i* dThe output of the rectification controller is switching functions Sa, Sb and Sc under a three-phase static coordinate system; the control module includes:
a first conversion unit, configured to convert the three-phase line current i on the ac side of the rectifier acquired by the first acquisition modulea、ib、icConverted into alternating side current i under two-phase synchronous rotating coordinate systemd、iq；
A second conversion unit for converting the three-phase line voltage u on the AC side of the rectifier obtained by the first obtaining moduleab、ubc、ucaConverted into AC side voltage u under two-phase synchronous rotating coordinate systemld、ulq；
A damping input unit for inputting a damping ra1、ra2；
A current calculating unit for calculating a current according to the line voltage u in the two-phase synchronous rotating coordinate systemldDC load, filter resistor R, desired DC output voltage u* DCCalculating expected current i under a two-phase synchronous rotating coordinate system* d；
A process control unit for controlling the process according to id、iq、uld、ulq、ra1、ra2、uDC、i* dCalculating out line switch functions Sab, Sbc and Sca, calculating out switch functions Sa, Sb and Sc according to the line switch functions Sab, Sbc and Sca, and controlling the rectifier under the condition of unbalanced power grid through the switch functions Sa, Sb and Sc;
the process control unit includes:
a calculation subunit for calculating according to id、iq、uld、ulq、ra1、ra2、uDC、i* dCalculating the linear switching function under the two-phase synchronous rotating coordinate system
Control output subunit for S pairldAnd SlqPerforming Park inverse transformation to obtain line switch functions Sab, Sbc and Sca under a three-phase static coordinate system;
the control execution subunit is used for calculating switching functions Sa, Sb and Sc according to the line switching functions Sab, Sbc and Sca and controlling the rectifier under the condition of unbalanced power grid through the switching functions Sa, Sb and Sc; l is inductance, ω is angular frequency, and t is time.
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| CN113472223B (en) * | 2021-06-29 | 2022-04-26 | 南京航空航天大学 | Control method of Vienna rectifier under power grid imbalance |
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| CN102891614A (en) * | 2012-10-26 | 2013-01-23 | 河南师范大学 | Improved dead-beat control method for pulse width modulation (PWM) rectifier at unbalance of voltage of power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Non-Patent Citations (3)
| Title |
|---|
| 基于无源性理论的电压不平衡条件下PWM整流器非线性控制策略;吕学志，等;《电力系统保护与控制》;20130316;第41卷(第6期);第71-76页 * |
| 电压型PWM整流器数学模型及非线性控制策略;王久和;《北京信息科技大学学报》;20110815;第26卷(第4期);第15-20页 * |
| 电网不平衡时电压型PWM整流器控制策略;王久和，杨秀媛;《中国电机工程学报》;20110625;第31卷(第18期);正文第2章 * |
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