带负载电流前馈的VIENNA整流器PR控制

Proportional resonant current control strategy with load current feed-forward control for VIENNA rectifier

针对三相VIENNA整流器传统PI控制器存在输入交流静差和抗负载扰动动态性能差的问题,提出一种适用于VIENNA整流器的负载电流前馈比例谐振(PR)控制策略。利用PR控制器有效消除输入电压电流相位差,实现无静差跟踪。并在电流闭环外嵌入负载电流前馈补偿环节,将负载扰动信息通过前馈环节直接作用于电流给定,提高抗负载扰动动态调节时间,增强系统抗扰性。并将所提方法与传统PI控制策略进行性能对比测试,实验结果表明所用方法可以有效提高负载扰动下的动态性能和改善输入功率因数。

Aiming at the disadvantage of the conventional PI controller of three-phase VIENNA rectifier, which has poor input AC static error and anti-load disturbance dynamic performance, a load current feed-forward proportional resonant(PR) control algorithm for VIENNA rectifier was proposed. PR controller is used to eliminate the phase difference between the input voltage and current effectively as well as realize the tracking without static error. The load current feed-forward compensation link is embedded outside the current closed loop, and the load disturbance information is directly acted on the current through the feed-forward link, which improves the dynamic adjustment time of anti-load disturbance and enhances the system immunity. The performance of the proposed method was compared with that of traditional PI control strategy. The test results show that the proposed algorithm can effectively enhance the dynamic performance and input power factor under load disturbance operation condition.