变电感参数三电平不可逆PWM整流器的电流PI优化控制

摘要

In vector controlled three phase three level unidirectional PWM rectifier,the exact inductor value of smoothing chock is needed,however,in compact rectifier,when iron dust core is used,the inductance is varied under different input currents,input voltages and output loads,this variation resulted in nonlinear current loop response and control parameters in digital implementation. So it is difficult to meet the demands of power factor and THD of current when in the condition of wide input voltage range and variable inductance.This paper,by analysis the modeling and current loop transfer function of rectifier,an optimized design of proportion in PI current controller is presented in order to reduce the effect of variable inductor value.Then the controller designing rules are derived with the help of current loop mode.This strategy ensures lower harmonic current and improves the power factor in full load and full range input voltage.Simulation and experimental results verify the feasibility and effectiveness of the proposed control strategy.%在矢量控制PWM整流中,需要精确地输入电感值作为控制参数。而高功率密度AC-DC整流器中输入电感常采用铁粉心作为电感材质,这些材质磁心的电感值随着输入电压、输入电流和负载的变化而变化,电感值的变化导致电流环增益和控制参数发生变化。因此,采用传统的控制方法比较难满足宽输入电压和变电感量条件下整流器控制性能的要求。文中提出采用优化电流PI控制器的矢量控制实现三相三电平不可逆PWM整流,该策略能够在宽输入电压范围和变电感值下实现PF（Power Factor）值和电流THD的优化控制。文章在分析三电平不可逆PW