三相VSR的一种改进型前馈补偿控制策略研究

Study on an improved feed-forward compensation control strategy for three-phase VSR

根据三相电压型PWM整流器(VSR)工作原理,工程上常采用传统的电压电流双闭环控制系统,其存在启动时电压过冲、抗干扰能力弱、功率因数降低等问题。为此,提出了在电流内环引入有功电压前馈补偿,在电压外环引入负载电流前馈补偿的控制思想,优化了dq坐标系下的电压电流双闭环控制策略,抑制了启动过程中的电压过冲、增强了系统的抗干扰能力,提高了功率因数。最后通过Matlab/Simulink软件仿真分析,仿真结果验证了改进后的控制策略的可行性和有效性。

According to the working principle of three-phase voltage source PWM rectifier (VSR), the projects are of-tenused in the traditional voltage current double closed loop control strategy , which causes problems such as voltage overshoot , weak anti-interference ability and low power factor .The paper puts forward a modified control strategy , in which an active voltage feed-forward compensationcan be introduced into the current inner-loop, and a load current feed-forward compensation can be introduced into voltage outer-loop.This modified double closed-loop control strategy is able to decrease the voltage overshoot , improve the anti-interference ability of the system , and improve the power factor.Finally, the simulation of the control system was built with Matlab/Simulink, the simulation results have veri-fied the feasibility and effectiveness of the modified control strategy .