基于滑模控制的永磁同步电动机DTC仿真研究

Simulation on Direct Torque Control of PMSM Based on Sliding Mode Control

针对传统永磁同步电动机(PMSM)直接转矩控制(DTC)中转矩和磁链脉动大的问题,在转矩和磁链控制中引入超螺旋滑模变结构,并采用基于莱维飞行的改进粒子群(PSO)算法对其可调参数优化整定。为加快系统动态响应速度,采用速度滑模控制器代替传统PI调节器。使用Matlab/Simulink对引入滑模变结构的DTC系统进行了仿真研究,分别对空载和带载条件下的转速、转矩以及磁链进行分析。仿真结果表明,滑模变结构的引入可有效抑制转矩和磁链脉动,降低转速超调,缩短过渡时间。仿真研究有助于学生更好地理解与应用滑模理论,并增强学生理论结合实际与自主创新意识。

To overcome the shortcoming of large torque and flux ripples in the traditional direct torque control(DTC)of permanent magnet synchronous motor(PMSM),a super-twisting sliding mode variable structure is utilized in torque and flux control and an improved particle swarm optimization(PSO)algorithm based on Levy flight is used to optimize its adjustable parameters.For the purpose of speeding up the dynamic response of the system,a speed sliding mode controller is utilized to replace PI regulator.The DTC system with sliding mode variable structure is simulated by MATLAB/Simulink.The speed,torque and flux waveforms under no-load and load conditions are analyzed respectively.The results demonstrate that the introduction of sliding mode variable structure can effectively suppress the torque and flux ripples.In addition,the speed overshoot is reduced and the transition time is shortened.This simulation study helps students better understand and apply sliding mode theory,and enhances their awareness of theoretical integration and independent innovation.