基于ESO的三相PWM整流器电流滑模控制研究

Research on current sliding mode control of three⁃phase PWM rectifier based on ESO

为解决三相PWM整流器在电流滑模控制下的高性能与电流抖振之间的矛盾,提出了一种基于扩张状态观测器(ESO)的新型电流滑模控制方案。采用扩张状态观测器观测系统的总扰动,构建新的滑模控制趋近律,将扰动观测值补偿进滑模控制律中,采用空间矢量脉宽调制的方法产生开关信号,提高系统抗扰动能力的同时削弱电流抖振。仿真和实验结果表明,采用新型电流滑模控制方案的三相PWM整流器实现了单位功率因数运行,具有良好的动态性能和鲁棒性,且与采用传统电流滑模控制方案的PWM整流器相比,总谐波失真降低约50%,静态性能更好。

To solve the contradiction between high performance and current chattering of three⁃phase PWM rectifier under current sliding mode control,a new current sliding mode control scheme based on Extended State Observer(ESO)is proposed.The extended state observer is used to observe the total disturbance of the system,and a new sliding mode control approach law is constructed,then the disturbance observation value is compensated into the sliding mode control law,which improves the system’s anti⁃disturbance capability and reduces current chattering.The space vector pulse width modulation method is used to generate the switching signal.Simulation and experimental results show that the three⁃phase PWM rectifier using the new current sliding mode control scheme achieves unit power factor operation,has good dynamic performance and robustness.Compared with the PWM rectifier using the traditional current sliding mode control scheme,it’s total harmonic distortion is reduced by about 50%,and has better static performance.