基于滑模变结构的PMSM控制系统的研究

针对永磁同步电机(PMSM)矢量控制系统中易受机械式传感器影响的问题,设计了一套基于滑模变结构控制(SMC)的永磁同步电机控制系统.由于永磁同步电机在运动时受到负载突变和系统参数变化会影响整个控制系统的稳定性,提出了具有开关结构的非线性滑模变结构控制的系统.首先分析了永磁同步电机在旋转坐标系下的数学模型,在此基础引入双闭环一阶滑模变结构控制系统,实现对PMSM的转速和转矩控制.仿真实验表明,滑模变结构控制系统不会受到外界变化的影响,永磁同步电机的转速和转矩都能稳定运行.滑模变结构控制系统响应更快,抗干扰能力大大提高,鲁棒性更强.

Research on Control System of PMSM Based on Sliding Mode Control

A permanent magnet synchronous motor (PMSM) control system based on sliding mode control (SMC) system is designed to solve the problem that the vector control system of PMSM is susceptibly affected by mechanical sensor.When PMSM is rotating,the stability of the whole control system is susceptibly affected due to load mutation and system parameters change.To solve this problem,a nonlinear sliding mode control system with switch structure is proposed.The mathematical model of PMSM is analyzed firstly in a rotating coordinate.On above basis,the first-rank double-loop sliding mode control system is introduced to control speed and torque of the PMSM.The simulation results show that sliding mode variable structure control system is not affected by the external changes,the speed and torque of the PMSM can be kept stable.The sliding mode control system possesses faster response,stronger robustess,and anti-interference ability is greatly improved.