Research On Three-Phase Voltage Source 4-Quadrant Rectifier Based On Fuzzy PID Control

The rectifiers are widely used in many occasions of national life and production, like its application in industrial production, rail transit, or power grid optimization. However, traditional rectifiers bring serious harmonic pollution to grid, lower electric energy quality and affect the safety of grid. PWM rectifier has many advantages such as high power factor, low harmonic pollution and ability of 4-quadrant operation, which can be used to solve the harmonic pollution from the source. Therefore, this thesis conducted the research of three-phase voltage source 4-quadrant rectifier and its control system theoretically and practically.This thesis started from the main circuit topology of three-phase voltage source 4-quadrant rectifier, analyzed its working principle, and established the mathematical model in different coordinates. On this basis, this thesis introduced the SVPWM modulation technique, and designed the control parameters of double closed loop control method based on grid voltage orientation, and put forward means to optimize control performance by using piecewise fuzzy PI controller in the outer voltage loop and using adaptive fuzzy controller in the inner current loop.Then, according to the characteristics of the rectifier and system requirements, this thesis accomplished the main circuit parameter design and key components selection, and built simulation model of main circuit and control system with Matlab to analyze whether the main circuit design is reasonable, and to compare the control performance of traditional PID control and Fuzzy PID control. The simulation results show the parameter design is correct and the improvement of control is effective.Finally, this thesis designed each circuit of the rectifier control system, analyzed circuit diagrams and parameter calculation in detail, gave the analysis of key design and program of DSP system, accomplished experiment environment of rectifier based on TMS32F28335 and performed the experiment. The experiment results show rectifier design is correct and the control is doable.