基于改进型滑模的永磁同步电机控制

Control of permanent magnet synchronous motor based on improved sliding mode

为了解决永磁同步电机传统滑模观测器确定转子位置时产生的抖振和控制系统抗干扰能力较弱的问题,本文提出了一种新的控制策略。该策略采用定子电流和反电动势作为控制变量,并引入具有鲁棒性强,跟踪性能好的高阶滑模变结构观测器,以替代传统的滑模观测器,从而提高系统的抗干扰能力。同时,该策略还使用饱和函数作为切换函数,以削弱抖振现象。此外,引入改进型锁相环来代替反正切函数,用于求解转子位置和转速,避免微分求解时引入噪音信号并减少滤波器导致的相位延迟问题。对于速度环控制,本文采用混合终端非奇异滑模控制器代替传统的PI控制器,以改善系统的动态性能。通过仿真验证,结果表明所提出的策略的正确性和有效性。

To address the issues of vibration during the determination of rotor position by traditional sliding mode observers in permanent magnet synchronous motors and the weak anti-interference capability of the control system,this paper proposes a new control strategy.The strategy takes stator current and back electromotive force as control variables and introduces a robust high-order sliding mode variable structure observer with good tracking performance to replace the traditional sliding mode observer,thereby improving anti-interference capability of the system.Simultaneously,the strategy employs a saturation function as a switching function to mitigate the vibration phenomenon.Furthermore,an improved phase-locked loop is used instead of an arctangent function for solving rotor position and speed to avoid the introduction of noise signals during differential solution and to reduce phase delay issues caused by filters.For speed loop control,this paper adopts a hybrid terminal nonsingular sliding mode controller instead of the traditional PI controller to enhance the system's dynamic performance.Simulation results validate the correctness and effectiveness of the proposed strategy.