Study Of Three-phase PWM Rectifier Based On DSP

The conventional rectifier produce harmonic problem in power system. While three-phase PWM VSR (voltage source rectifier) can provide constant dc bus voltage and get unity power factor. It also has line power feedback capability. So it is becoming interested in power electronics field.With the development of large-scale integrate circuit technology and computer technology, microcomputer-based rectifier controller will become the main stream of rectifier controllers in the future. Constant improvement in rectifier control method set an even higher requirement for the computation of the microcomputer-based rectifier controller. According to this requirement, the paper studies and designs the DSP-based rectifier controller by using DSP (Digital Signal Processor) as the control center.This paper introduces the control function and the developing tendency of PWM rectifier. And, it illustrates DSP's performance advantage compared with the other single chips or general-purpose processors. It deals with the design of the DSP-based rectifier's hardware and the flowchart and realization method of its software from the aspects of control circuit, measuring circuit, main circuit and the method of realizing SVPWM. The paper also introduces use of IPM (Intelligent Power Module), and designs main circuit based on it. Because of the adoption of these advanced technologies, the PWM rectifier structure is simpler, its performance is reliable and its operation convenient.The DSP-based three-phase PWM VSR has been tested in the laboratory. The result of test shows that all functions of the PWM rectifier are efficient.