基于指数滑模变结构的永磁同步电机直接转矩控制系统研究  

The Research of Direct Torque Control System for Permanent Magnet Synchronous Motor Based on Exponent Variable Structure Sliding Mode Control

作　　者：陆晋[1] 乔微[1] 刘贤兴[1] 朱湘临[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电气自动化》2007年第4期8-10,共3页Electrical Automation

摘　　要：直接转矩控制(DTC)是一种高性能的控制方法。但传统的直接转矩控制系统采用纯积分的电压模型作为磁链观测器,存在着误差积累以及直流偏移问题,利用两个滞环比较器对转矩和磁链进行控制,虽然响应速度快,鲁棒性强,但导致了电流和转矩的波动。本文提出了一种新颖的改进策略,用指数滑模变结构控制器来替换 PI 速度调节器,并构建永磁同步电机指数滑模变结构直接转矩控制系统,在保留传统 DTC 动态性能的情况下,提高了电机的低速性能,减小了转矩脉动和电磁噪声,仿真和实验结果验证了该策略的可行性。Direct torque control （DTC） is a high performance control method, but the flux observer of traditional direct torque control system is making up of the pure integral voltage model and so occurs the problems of accumulate error and direct current excursions. Torque and flux are controlled by torque and flux hysteresis, the system has speedy response and excellence dynamic performance, but occurs the defect of current and torque ripple. A novel strategy which use exponent variable structure sliding mode controller to instead of PI speed controller was put forward in the paper, and the DTC system of PMSM based on exponent variable structure sliding mode were built. The torque at low speed is improved, and the torque ripple and electromagnetic noise are weakened and keep dynamic performance of the basic DTC. Simulation and experiment results indicate the validity of this method.

关 键 词：直接转矩控制 永磁同步电机 滑模变结构 PI调节器 

分 类 号：TM921.2[电气工程—电力电子与电力传动]