基于优化前馈控制的VIENNA整流器动态性能研究

摘要

在传统平均电流控制电压环路基础上,提出了一种基于前馈控制的平均电流控制方案,电压环加入负载前馈控制和电网电压前馈控制,减小直流侧电压超调量;电流环采用误差迭代PI算法,实现无静差调节,优化三相VIENNA整流器的动态响应.所提出的负载前馈变量仅在负载阶跃时更新,在稳态时保持恒定.另外,本文对频域响应特性进行分析并通过仿真加以验证.%Based on the traditional average current control voltage loop,this paper proposed an optimized feedforward control scheme.The voltage control loop introduced the load feedforward control and the grid voltage feedforward control to reduce the voltage overshoot in DC side.The current control loop designed as a proportional controller using error iteration algorithm,which realize floating control and optimize the dynamic response of three-phase VIENNA rectifier.The proposed load feedforward terms updated when the load step and remains constant at steady state.In addition,this paper analyzed the frequency response characteristics and validates them by simulation.