永磁同步电机控制系统的仿真研究

摘要

Permanent magnet synchronous motor is a non - linear, complex time - varying system with strong current - speed coupling, and the performances of traditional slider mode control are poor.In order to improve the dynamic performances and robustness of control systems, mathematical model of permanent magnet synchronous motor is analysis, a combination model is proposed based on the sliding mode control and auto -disturbance - rejection control.The control system uses sliding mode control to control the electric current of the inner loop, and auto - disturbance rejection control to control the rotary speed of the outer loop.At the same time, the system load disturbances are estimated and compensated.Simulation experiment is carried out in matlab/Simulink environment, and the experimental results show that this control system eliminates the chattering problem in sliding mode control, improves the system robustness under the load disturbance and system parameters disturbance, and has a good dynamic and static performance.%关于同步电机优化控制问题,由于永磁同步电机是一个非线性、复杂时变系统,电流和转速具有强耦合性,采用传统滑块控制方式具有抖振现象,导致加入负载或负载扰动时系统控制性能变差.为了提高控制系统动态性能和鲁棒性,在分析永磁同步电机数学模型的基础上,提出一种滑模控制和自抗扰控制相结合的永磁同步电机控制系统.控制系统利用滑模控制对电机内环电流进行控制,外环采用自抗扰控制对转速进行控制,同时对系统负载扰动进行估计和补偿.在matlab环境下进行了仿真,试验结果表明,控制系统消除了滑模控制存在的严重抖振问题,提高了系统对负载及系统参数扰动的鲁棒性,具有较好动态和静态性能.