三相PWM整流器高阶积分端末滑模控制策略

High-Order Integral Terminal Sliding Mode Control Strategy of Three-Phase PWM Rectifier

针对目前三相PWM整流器中PID控制器控制精度不高、鲁棒性较差,且传统积分滑模控制器滑模面抖振现象仍较大等问题,提出了一种三相PWM整流器电流内环高阶积分端末滑模控制策略。该控制策略结合了积分滑模面和端末滑模面,形成一种积分端末滑模面,从而获得有限的收敛时间,降低了稳态误差。并通过结合高阶滑模控制思想和传统P控制策略,提出一种高阶滑模趋近率,使得开关函数出现在控制量高阶方程中,有效降低了滑模面的抖振现象。最后,通过仿真试验证明了该策略的正确性和可行性。

The existing PID controller in the three-phase PWM rectifier has low control accuracy and poor robustness,and the chattering phenomenon of the sliding surface of the traditional integral sliding mode controller is still relatively large.Aiming at these problems,a high-order integral terminal sliding mode control strategy of the three-phase PWM rectifier current inner loop is proposed in this paper.This control strategy combines the integral sliding surface and the end sliding surface to form an integral end sliding surface,so as to obtain a finite convergence time and reduce the steady-state error.And through the combination of high-order sliding mode control ideas and traditional P control strategies,a high-order sliding mode approach rate is developed,so that the switching function appears in the high-order equation of the control variable,the chattering phenomenon of the sliding mode surface is effectively reduced.Finally,the simulation test proves the correctness and feasibility of the strategy.