Research And Design Of Voltage-source Four-quadrant PWM Converter

With the development of power electronics and power switching devices, the PWMrectifier gradually become a hot topic. PWM rectifier has the advantages of sinusoidalinput current, high power factor and bidirectional power flow，so it is widely used in newenergy field and high-performance AC drive field. This thesis focuses on the research anddesign of voltage-source four-quadrant three-phase PWM converter, using systemmodeling and simulation method to study it.On the basis of in-depth analysis of the main circuit of voltage-source PWM rectifier,a PWM rectifier mathematical model based on the two-phase synchronous rotatingcoordinate system is adapted. Using feedforward decoupling control method to achieveindependent current control in rotating coordinate system and design the dual closed-loopcontrol system based on the PI regulator. This thesis presents the design principles andcorresponding formula of DC bus voltage selection,DC capacitor, the AC side inductorand power module circuit. In addition,a detailed analysis of inductor design,three-phasegrid voltage synchronization technology and solutions of inrush current are discussed.This thesis constructed the simulation platforms based on Saber Designer softwareand completes parameters debugging of main circuit and PI regulator. Then, analysis ofthe relationship between system dynamic performance and AC side inductance ispresented.Three-phase voltage synchronous technology and the design of inductor are alsoexperimental verified.On the simulation platforms,a series of running experiments arecompleted, such as starting test,variable load test, rectifier to inverter running test and soon.All the simulation results demonstrate the good dynamic performance of the system.