三相PWM整流动态性能改进策略研究

Control Scheme on Improving Dynamic Performance of Three-Phase PWM

为了给电动汽车提供稳定的充放电环境,针对传统整流装置输入侧谐波严重、功率因数较低的缺点,提出一种基于改进迭代比例积分(PI)控制的谐波抑制方法。同时,采取改进电流预测控制方式加强系统的动态响应性能,可明显减小电网电流的总谐波失真(THD)。此外,结合运用迭代思想的重复控制能消除周期性干扰的特性,实现输入电流无误差渐进跟踪输入正弦电压的要求,并可消除重复畸变。最后,仿真和实验结果验证了所提出控制策略的正确性。

In order to provide stable environment of charging-and-discharging for electric vehicle,a suppression method based on improved iteration proportional-integral（ PI） control is proposed for changing the disadvantage of large harmonic contamination and low power factor on the AC side in traditional rectifying device. The improved deadbeat current control method is chosen to enhance dynamic performance of the system and effectively reduce total harmonic distortion（ THD） of grid current. In addition,combing the characteristic of eliminating periodic interference of repetitive control,the requirement of current progressive tracking voltage correctly is realized and the repetitive distortion is removed. Finally,the simulation and experimental results prove the validity of this strategy by comparing with traditional method.