具有模糊检测器的模糊直接转矩控制系统

A Fuzzy Direct Torque Control System With a Fuzzy Estimator

本文建立了模糊电阻检测器以检测感应电动机定子电阻在线值，实验表明利用在线电阻控制定于碰链，提高了磁链的幅值。通过合理选择各控制变量的模糊子集论域范围，得到了模糊直接转矩控制器的控制规则，为提高系统性能，将在线电阻用于模糊控制器各类计算。仿真结果表明了该控制器可有效改善电机低速运行时的动态和稳态性能。

A fuzzy estimator has been set up for measuring on-line stator resistances of an induction motor. The results of experiments have shown that the magnitude of stator magnetic flux, controlled by the resistance from the fuzzy estimator, increases. Through selecting the domains of subsets of the fuzzy variables in fuzzy controller, the fuzzy rules of DTC controller are obtained. In order to improve the systematic performance, the on-line resistances have been taken into account for the various calculations of the fuzzy controller. The simulated results demonstrated that the fuzzy controller can improve the dynamic and static performances of the motor at low speeds evidently.