基于滑模观测器的永磁同步电机电流偏差解耦控制

Current Deviation Decoupling Control with a Sliding Mode Observer for Permanent Magnet Synchronous Motor

为解决传统电压前馈解耦控制对电机参数敏感、抗扰性差的问题,该文提出一种基于滑模观测器的电流偏差解耦控制方法。通过计算偏差解耦控制电流的耦合项,发现相对于传统电压前馈解耦,偏差解耦的耦合项简单且易于控制,解决了传统电压前馈解耦控制解耦效果不理想的问题。通过电流滑模观测器的跟踪特性,将定子电流的估计值作为状态变量,反馈到系统输入端,用以补偿定子电流误差值。该方法不仅对电流环实现更好的补偿控制,还实现d、q轴电流完全解耦,保证系统动态响应速度,提高了系统的抗扰性。通过仿真和实验证明所提出控制器的有效性。

In this paper,a permanent magnet synchronous motor current controller based on a sliding mode observer is proposed for improving the robustness to parameter perturbations and load disturbances.By calculating the current deviation decoupling control coupling term,it is found that the deviation decoupling coupling term is simple compared with the conventional voltage feed-forward decoupling.It solves the unsatisfactory decoupling effect of the conventional voltage feed-forward decoupling control.Through the tracking characteristics of the current sliding mode observer,the estimated value of the stator current is taken as a state variable and fed back to the system input terminal to compensate the current error value.This method not only achieves better compensation control for the current loop,but also completely decouples the d and q axis currents,ensuring the dynamic response speed of the system and improving the immunity of the system.The proposed controller is found to be more effective than the conventional controller through simulations and experiments.