永磁同步电机调速系统的复合控制策略研究

Research on compound control strategy of permanent magnet synchronous motor speed control system

针对传统PI控制在永磁同步电机中存在调速性能不佳、抗干扰能力不足等问题,文章设计一种新型的复合控制方案——转速外环基于负载转矩观测器的滑模自抗扰控制和电流内环无差拍预测控制。在转速环,引入滑模算法设计非线性误差反馈控制律,提升自抗扰控制的响应速度,同时为适应实际工作环境,设计负载转矩观测器,对扩张观测器进行补偿,改善其干扰观测精度;在电流环,设计无差拍预测控制对电流精准跟踪,使得永磁同步电机动态性能和电流品质得到提高。仿真结果表明,文章提出的新型复合控制策略,对永磁同步电机的综合性能和抗干扰能力有明显提高,有效降低了复杂工况环境对电机的不良影响。

Aiming at the poor speed regulation performance and insufficient anti-interference ability of permanent magnet synchronous motor existing in the traditional PI control,this paper designs a new type of composite control scheme—sliding mode self-immunity control based on load torque observer in the speed outer loop and current inner-loop deadbeat control.In the rotational speed ring,the sliding mode algorithm is introduced to design the nonlinear error feedback control law to improve the response speed of the self-immunity control,and at the same time,to adapt the actual working environment,the load torque observer is designed to compensate for the expansion observer and to improve the accuracy of the disturbance observation;in the current ring,the current is designed to be tracked accurately by the deadbeat control,which makes the dynamic performance of the motor and the quality of the current to be improved.Simulation results show that the new composite control strategy proposed in this paper has significantly improved the comprehensive performance and anti-interference ability of the permanent magnet synchronous motor,and effectively reduces the adverse effects of the complex working condition environment on the motor.