Research On Three Phase Voltage PWM Rectifier And Its Control Strategies

This paper has introduced a variety of PWM converter topology structures, controlstrategies and their development trend. The paper traded the three phase voltage-sourcePWM rectifiers as the key point and made comprehensively research concerning itstheories.The thesis has analyzed the system models based on the three-phase static coordinatesystem, the two-phase static coordinate system and the two-phase synchronous rotatingcoordinate system from the point of the topology of the main circuit. Then the conditionthat the inverter can operate under four-quadrant is discussed and showed in detail. Twocontrol schemes has been analyzed and achieved from the point of the control of VSR:double closed loop control strategy based on space vector PWM (SVPWM) and directpower control based on space vector PWM (SVM-DPC).On the basis of the analysis aboutthe traditional double closed loop control strategy, this paper has got the math model ofSVM-DPC control, designed flux observer and achieved the concrete realization methodof the scheme.Set up a simulation model of PWM rectifier. And detailed structure diagram ofcontrol circuits sub-modules and SVPWM sub-module was given out. After comparing andanalyzing the simulation results of the two control scheme: verify the two control schemescan make PWM converter realize current sine and unit power operation, and SVM-DPCcontrol has better control performance on the response speed and reliability.