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Research on PWM Rectifier and Its Nonlinear Control Strategies
Author: LiuKun
Tutor: LiuJinBo
School: Shandong University
Course: Control Theory and Control Engineering
Keywords: PWM rectifier Inputoutput feedback linearization Space Vector Pulse Width Modulation Threephase asynchronous motor speedadjustment Vector control
CLC: TM461
Type: Master's thesis
Year: 2010
Downloads: 445
Quote: 5
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Abstract
Traditional uncontrolled diode rectifier and phase controlled rectifier consisted of halfcontrolled thyristor, have some drawbacks:low acside power factor, big current ripple and unrevisable power flow. PWM rectifier selfturnoffdevice can make the grid current approach to sine wave、grid power factor come to 1、four quadrant circulate、actively eliminate acside harmonic pollution of inverter and economize energy resources. It has many advantages such as rapid motion response、DC voltage controllable and load disturb resistible.In this paper, the author lays a strong emphasis on study of threephase voltage source PWM rectifier and its control methods. The fourquadrant working principle of PWM rectifier has been explained here, and the control goals of PWM rectifier will be achieved as long as the acside current has been controlled. The paper deduces the math model based on switch function under reference frame (a, b, c), then deduces the twophase quiescent reference frame and twophase rotary reference frame math model after using the reference frame transform. It can be found that threephase voltage source PWM rectifier is a timevarying、strongcoupling、complex coupled nonlinear system. Traditional control scheme usually designs controller based on the smallsignal linearized model near the steadystate work point. But it needs a larger DCside capacitor, and the global stability of the system can not be proved theoretically.This paper applies nonlinear control theories to design the controller for the converter system consisted of PWM rectifier. The implementation of specific is: According to the systems control goal, the doubleclosedloop control structure consisted of inner current loop and outer voltage loop has been designed, and then using voltage oriented control, the inner current loop controller and outer voltage loop controller of threephase voltage source PWM rectifier can be designed by inputoutput feedback linearization and the sliding mode control method.For threephase asynchronous motor AC speedadjustment system, this paper lays a strong emphasis on study of asynchronous motor AC speedadjustment system consisted of dualPWM converters. The design and control strategies of the whole speedadjustment system has been given here after analyzing the the mathematical model and the principle of vector control of threephase asynchronous motor. The author applies cascade structure of nonlinear control scheme based on inputoutput feedback linearization to design controller for acside rectifier and applies rotorfluxoriented Vector Control to design controller for motorside inverter.Many simulation experiments have been finished by the MATLAB simulation toolbox for verifying the validity of above schemes. The simulation results show that: threephase voltage source PWM rectifier dcside voltage is steady、controllable and load disturb resistible, acside power factor is controllable (such as unit power factor) and power can flow bidirectionally; Besides, for threephase asynchronous motor AC speedadjustment system, the control goals of threephase asynchronous motor’s speed can be achieved and the robustness of the system is strong for load fluctuation.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Rectifier
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