基于改进积分器的异步电动机直接转矩控制系统研究

Study of Induction Motor Direct Torque Control System Based on Improved Integral

针对传统异步电动机直接转矩控制系统中的磁链观测误差,对磁链观测中纯积分带来的直流漂移和积分初值问题以及定子电阻变化对磁链观测的影响进行了改进。通过用低通滤波器来代替纯积分,大大改进了积分效果。由Matalb的仿真结果可知,改进后的磁链观测器提高了对定子电阻的鲁棒性,抑制了直流漂移,提高了控制系统的性能。

Due to observe flux error in direct torque control system, this paper proves the integral in observe flux to solve the problem of direct current excursion and integral initial value. The filter is used in observe flux instead of pure integral. The project is tough to stator resistance. The results of simulation proves the project is in effect and the performance of direct torque control system is increased.