永磁同步电机的改进模型预测自抗扰前馈控制

An Improved Prediction Control Model for PMSM with Active Disturbance Rejection and Feed-Forward Control Strategy

针对永磁同步电机无差拍电流预测控制系统受参数扰动后会引起稳态误差和剧烈抖振的问题,采用一种前馈控制与无差拍控制相结合的改进控制策略,降低了参数扰动引起的电流和转矩脉动。在前馈通路中采用滑模扰动观测器与分数阶积分补偿相结合的快速响应控制策略,解决引入普通前馈控制带来的稳态误差增大问题。滑模观测器的滑模面采用以sgn函数为基础的二阶趋近律,进一步抑制除参数扰动外的干扰项。对传统的无差拍电流预测模型,引入普通前馈控制策略的电流预测模型以及在前馈通路中添加滑模扰动观测器与分数阶补偿策略的改进预测模型进行仿真对比。仿真结果表明:所提策略在不同工况下均可有效消除参数扰动引起的稳态误差并降低电流抖动,永磁同步电机调速系统的鲁棒性和动态性能得到了有效提高。

An improved control strategy combining feedforward control and deadbeat control is adopted to solve the problem of steady-state error and severe chattering caused by parameter perturbation in the deadbeat current predictive control system of permanent magnet synchronous motor(PMSM)and to reduce the current and torque pulsation caused by parameter perturbation.A fast dynamical response strategy combining sliding-mode disturbance observer and fractional integral compensation is proposed to solve the problem of steady-state error increasing caused by introducing ordinary feed-forward control strategy.The second-order sliding mode approach law based on the sgn function is adopted to the sliding mode surface of the observer to further suppress the interference terms except for the parameter disturbance.The traditional deadbeat current predictive control model,the improved current predictive model with the common feedforward control strategy,and the improved prediction model with the sliding mode disturbance observer in the feedforward path and the fractional order integral compensation strategy are simulated and compared.Simulation results show that the effectiveness of the proposed model in eliminating the steady-state error caused by parameter disturbances and in reducing the current pulsation is verified under various working conditions,and both the robustness and the dynamic performance of the PMSM speed regulation system are effectively improved.