Research Of PWM Rectifier Based On Vector Control

With the rapid development of power electronics technology, especially the increasingly urgent need to the high performance, the PWM rectifier technology has drawn more and more attentions while been widely used. As the research focus, The three-phase voltage source PWM rectifier has many advantages, including the high power factor,high output DC-voltage stability,good dynamic performance and bi-directional flow of energy. Of particular importance is that it successfully solves the harmonic pollution problem brought by the traditional uncontrolled,phase controlled rectifier devices.This paper firstly analyses the basic principle of operation of the three-phase voltage source PWM rectifier as well as the topology structure, mathematical model and control strategy; the detail discussions and characters of the voltage vector oriented control (VOC) and virtual-flux vector oriented control (VFOC) are also presented, including a new method of flux observer and the effectiveness proved by simulation.Secondly, senseless AC current control scheme is proposed with the purpose of improving system reliability, reducing the cost and volume of control system according to the VFOC, the simulation gives a positive answer to the feasibility of this control idea. Then the three control methods are compared and studied, acquired their respective control performance, shortcomings and advantages. The conclusive analysis is also stated.Finally, this paper provides a design rule of inductance, capacitance and PI regulator. An experiment prototype based on TMS320LF2407 has been made as some software programs debugged. Eventually, some testing results are shown.