双PWM变频器电容电流反馈控制的研究

Research on capacitance current feedback control for dual-PWM frequency converter

为了减小双PWM变频器的电容容量和稳定直流母线电压,采用了一种新型的电容电流反馈控制策略。该控制策略的特点是在电流前馈的基础上,直接引入电容电流的反馈控制,使电容电流紧紧跟随给定电容电流的变化,实现电容电流无静差调节。建立仿真模型,结果表明该方案优化了直流母线的动态特性,降低了对电容容量的要求。

In order to reduce the capacitance capacity of dual-PWM frequency converter and stable the DC bus voltage, a new kind of capacitance current feedback control strategy is adopted. The characteristics of the control strategy is directly introduced capacitance current feedback control based on current feedforward which make capacitance current closely follow given capacitance current changes,and realize capacitance current no-static poor regulation. The simulation model is established, and the results show that the scheme improves the dynamic cha- racteristics of DC bus, reduces the demands for capacitance capacity.