永磁同步电机滑模变结构直接转矩控制研究

Variable structure sliding mode control for PMSM DTC

为了克服传统永磁同步电机直接转矩控制中存在的磁链和转矩脉动较大、逆变器开关频率不恒定等问题,引入了滑模变结构控制策略。详述了滑模变结构的基本原理、永磁同步电动机滑模变结构模型,分析了抖振产生原因及其对策,推导了滑模变结构控制律。仿真结果表明该控制策略极大地改善了系统的动、静态性能,对系统参数和外部干扰表现出较强的鲁棒性。

To solve those problems associated with conventional Direct Torque Control （DTC） of Permanent Magnet Synchronous Motor （PMSM）, such as high flux and torque ripple, inverter switching frequency, a new control strategy of Variable Structure Sliding Mode （VSS）is proposed. It explains the basic theory of Variable Structure Sliding Mode （VSS）and the model of Variable Structure Sliding Mode（VSS） Control for the PMSM in detail, analyses the reason and countermeasure of chattering, derivates the Variable Structure Sliding Mode Control law. The simulation results show that the control strategy strongly improves the dynamic and static operation performance, and it has stronger robust to motor parameter and disturbance.