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Three-phase PWM rectifier based on DSP

Xiaofeng Wang

Abstract

This paper studied the three-phase PWM(pulse width modulation) rectifier in dual PWM variable frequency speed regulation system.Its control system was designed.The mathematical model of PWM rectifier was derived in the three-phase static coordinate system.On this basis,we introduced two-phase rotating dq coordinate system and developed its mathematical model.Using feed-forward control technology,we designed a double closed-loop control system based on current closed-loop and voltage closed-loop of PI regulator.The PWM rectifier control system with DSP as the core was constructed,which can effectively restrain the harmonic pollution and realize the bidirectional power transmit and the control over ac-side unit power factor closes to 1.

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Available abstract

Key concepts: PWM rectifier, Pulse-width modulation, Control theory (sociology), Rectifier (neural networks), Harmonic, Three-phase, Precision rectifier, Control system