改进的永磁同步电机直接转矩控制系统仿真实现  

Simulation of improved direct torque control system for permanent magnet synchronous motor

作　　者：王玲芝[1] 

机构地区：[1]西安邮电学院计算机系,陕西西安710061

出　　处：《电力系统保护与控制》2009年第19期65-68,共4页Power System Protection and Control

基　　金：陕西省自然科学基础研究计划项目(SJ08-ZT14);西安市科技计划项目(CXY08017(1))

摘　　要：直接转矩控制的主要缺点是低速时转矩脉动大。其中一个重要原因是电机在运行中存在温度升高及电流频率变化等现象,定子电阻的阻值发生变化,使定子磁链的估计精度降低,导致电磁转矩出现较大的脉动。针对这一问题,设计了一种改进的永磁同步电机直接转矩控制系统。根据实际转矩和给定转矩的偏差,提出了一种使用PI控制器补偿定子电阻变化的方法。仿真表明该控制系统可以减小磁链和转矩脉动,改善了系统的运行性能,提高了系统对电机参数变化的鲁棒性。The main disadvantage is of high torque ripple at low rate. An important reason is that stator resistance value changes for the phenomenon of rising temperature and changing current frequency when motor is running. Thus the estimation precision of stator flux decreases, leading to high electromagnetic torque ripple. Aiming at this problem, a direct torque control system of permanent magnet synchronous motor is devised. According to the error between actual torque and reference torque, a means for compensating stator resistance variation using PI controller is proposed. The simulation results show that the control system can reduce the flux and torque ripple. The running performance of system is improved and the robustness to parameters variation is enhanced.

关 键 词：永磁同步电机 直接转矩控制 转矩脉动 PI控制器 定子电阻变化 

分 类 号：TM341[电气工程—电机]