三相电压型PWM整流器滑模控制算法研究

Research on Sliding Mode Control Algorithm of Three-Phase Voltage Source PWM Rectifier

三相电压型PWM整流器通常采用传统的线性双闭环控制器结构,由于PI控制的滞后性,双闭环PI控制难以保证系统在扰动下具有良好的动态性能。考虑三相电压型PWM整流器的非线性特征,利用滑模变结构对外部干扰和系统参数变化的强鲁棒性,设计了一种采用滑模变结构非线性控制算法。在Matlab/Simulink中搭建了PWM整流器控制系统仿真模型。滑模变结构控制算法与双闭环PI控制算法调节性能的对比表明,滑模变结构控制算法具有更好的动稳态性能。

The three-phase voltage source PWM rectifier usually adopts the traditional linear double closed-loop controller structure. Due to the hysteresis of PI control,the double closed-loop PI control is difficult to ensure the system has good dynamic performance under disturbance. Considering the nonlinear characteristics of three-phase voltage source PWM rectifier ,a nonlinear control algorithm based on sliding mode variable structure is designed by using the strong robustness of sliding mode variable structure to external disturbances and system parameter changes. The simulation model of PWM rectifier control system is built in Matlab/Simulink. The comparison between the regulation performance of the sliding mode variable structure control algorithm and the double closed-loop PI control algorithm shows that the sliding mode variable structure control algorithm has better dynamic steady state performance.