三相电压型PWM整流器小信号建模及其控制器设计

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Abstract This paper deals with the analysis of the average large-signal model and zero-sequence component of a three-phase voltage source PWM rectifier (VSR). Based on it, a decoupled small-signal dynamic model is developed in dq coordinate system. By using the derived model, inner current and outer voltage control loops are developed and analyzed respectively. After properly setting the crossover frequency of the control loop, the zero position of the open loop transfer function is adjusted with a trade-off of the phase margin and the loop gain of low frequency. At last, the optimized controller parameters are obtained paying attention to both stability and disturbance rejection capability. Finally, an experimental prototype controlled by a TMS320F2812 DSP is built and tested. Both the simulation and experimental results illustrate the validity of the theoretic analysis.

Key words： Three-phase voltage source PWM rectifier small-signal model PI controller adjusting of zero position

Received: 22 January 2009 Published: 04 March 2014

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TM461

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