基于锁相环的指数趋近率PMSM离散滑模控制系统

Exponential Approach Rate PMSM Discrete Sliding Mode Control System Based on PLL

针对传统滑模控制加低通滤波器滤波后反电势存在明显相位滞后,改进型滑模观测器反电势中存在高频谐波和噪声,在运算时会影响其观测精度,提出一种基于正弦锁相环的改进型指数趋近率离散滑模观测器无位置传感器控制方法,有效地提高了滑模观测器的观测精度。同时为了便于用DSP设计数字化控制程序,采用多种方法对所用控制模块进行了合理的离散化。实验结果表明,该控制系统的转子位置观测精度较高,定子电流品质较好,速度控制稳定、动态性能优异。

In order to solve the obvious phase lag of the back EMF of the traditional sliding mode control with low-pass filter,and the high frequency harmonics and noise in the back EMF of the improved sliding mode observer,which will affect the observation accuracy during the operation,this paper proposes an improved position sensorless control method of the exponential approach rate discrete sliding mode observer based on the sine phase-locked loop,which effectively improves the observation accuracy of the sliding mode observer.At the same time,in order to design the digital control program with DSP,this paper uses many methods to discretize the control module.