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The Study of Three-phase Voltage Source PWM Rectifier and Control Strategy

Author: LiuYunZhao
Tutor: XiaoBing
School: South China University of Technology
Course: Control Engineering
Keywords: PWM rectifier LCL filter Direct current control SVPWM
CLC: TM461
Type: Master's thesis
Year: 2012
Downloads: 250
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Abstract


As a result of large scale using of power electronic device in practical applications,harmonic pollution is increasing day by day. As people become increasingly demanding greenpower, the traditional non-controlled and semi-controlled rectifier device can no longer meetthe needs of practical application. The three-phase voltage source PWM rectifier get people’ sattention with a two-way flow of energy, working in unity power factor, network-side currentclose to sine wave, reactive power regulation, and a series of advantages.The study analyzes the principle of the three phase voltage source PWM rectifier,according to the topological structure of the main circuit for PWM rectifier. Also it deducesthe mathematical model in three-phase coordinate system based on the switch function, andestablishes mathematics model in static coordinate system and rotation coordinate system.What’s more, the current transfer process of the rectifier is briefly analyzed.According to the principle of the LCL filter, this paper puts forward a design method ofthe parameters of the LCL filter. Through comparative study with traditional three aspectssuch as the L filter based on the total inductance, the resonance frequency and differentfrequency band of the harmonic control ability, it comes to the conclusion that in the samelevel of harmonic, the total inductance of LCL filter is about a third of the L filter. This canobservably reduce the cost of the system.This paper briefly introduces the PWM rectifier of several common current controlstrategy. According to the direct current control strategy based on voltage-oriented, themathematical model in rotation coordinate, and the application of the network voltagefeed-forward principle, the double closed loop control system of voltage and current isdesigned. Then, finish the simulation experiment under the simulink environment, and verifythe systematic exactness and feasibility by analyzing the simulation results.Finally, adopting high speed digital signal processor TMS320F28035as key processingunit, make an actual production of a20KW PWM rectifier prototype. And we realize thePWM converter’s main function through the control software of PWM rectifier, which is donein the C/C++integrated development environment.

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