基于滑模变结构永磁同步电机的直接转矩控制

PMSM-DTC based on sliding mode variable structure

采用传统的直接转矩控制策略时,电机电磁转矩和磁链脉动较大,并且逆变器开关频率不恒定.为解决该问题,将滑模变结构控制策略引入永磁同步电机直接转矩控制系统中,应用Matlab/Simulink对其进行仿真研究,并且实现了基于TMS320LF2407滑模变结构永磁同步电机的直接转矩控制,并对控制系统动、静态性能与传统直接转矩控制进行了对比研究.仿真和实验结果表明:与传统直接转矩控制相比较,滑模变结构直接转矩控制系统中定子磁链和电磁转矩脉动大幅度降低,而动态响应速度基本相同,逆变器开关频率恒定.

Permanent magnet synchronous motor（PMSM） drive based on conventional direct torque control（DTC） has large ripples of the electromagnetic torque and flux linkage,and also has variable switching frequency.To resolve above problems,sliding mode variable structure control（SMVSC） was introduced into the PMSM DTC.This strategy was numerically simulated by Matlab/Simulink toolbox,and the SMVSC-DTC PMSM drive system based on digital signal processor（DSP） TMS320LF2407 was implemented.Static and dynamic performances of two schemes were analyzed.Both simulation and experimental results show that the proposed SMVSC-DTC can dramatically improve the static performances while preserve the dynamic performances of conventional DTC,and fix the variable switching frequency.