滑模控制策略在三相PWM整流器中的应用

Application of Sliding Mode Strategy in Three-phase PWM Rectifier

传统的三相电压型PWM整流器一般多采用双闭环控制,即电压外环控制和电流内环控制,控制环节均采用PI算法。但因为PI算法典型的滞后特性,使得双闭环控制的动态响应性能较差,抗干扰能力不强。为了解决这一问题,文章提出了一种用滑模控制算法来代替电压外环的PI算法的新的控制算法。通过MATLAB仿真软件中的Simulink模块进行模型的搭建,通过对比结果表明,滑模控制方式比传统的双闭环控制方式具有更优越的动态性能。

Traditional three-phase voltage-type PWM rectifiers generally adopt double closed-loop control,that is,voltage outer loop control and current inner loop control,and the control links use PI algorithms.However,due to the typical hysteresis characteristics of the PI algorithm,the dynamic response performance of the dual closed-loop control is poor and the anti-interference ability is not strong.In order to solve this problem,the article proposes a new control algorithm that uses sliding mode control algorithm to replace the PI algorithm of the voltage outer loop.The model is built through the Simulink module in MATLAB simulation software.The comparison results show that the sliding mode control method has better dynamic performance than the traditional double closed-loop control method.