直接转矩控制(DTC)相比矢量控制转矩响应快,能够很好地适应对转矩响应要求较高的应用场合。但常规DTC存在转矩脉动、磁链脉动大和谐波电流较大的缺点,可能导致更高的定子铜耗,从而降低驱动效率。针对这一问题,以DTC基本原理为出发点,提出一种用磁链和转矩模糊控制器代替传统滞环比较器的控制策略。常规模糊控制器可能会出现模糊规则不足或得不到充分应用的情况,导致模糊控制效果变差,针对这一不足在转矩环加入变论域模糊控制。使用MATLAB/Simulink对变论域模糊DTC系统进行仿真。仿真结果表明:该变论域模糊控制系统能够有效地抑制转矩脉动、磁链脉动和谐波电流。

The torque response of direct torque control (DTC) was faster than that of vector control. But conventional DTC had the disadvantages of torque ripple, flux ripple and large harmonic current, which may lead to higher copper loss of stator and lower driving efficiency. Based on the basic principle of DTC, a new control strategy, which used flux chain and torque fuzzy controller instead of traditional hysteresis comparator, was proposed to solve this problem. The conventional fuzzy controller may have insufficient fuzzy rules or insufficient application, which led to the deterioration of fuzzy control effect. The torque loop was added to the variable domain fuzzy control. The fuzzy DTC system was simulated by MATLAB/Simulink. The simulation results showed that the fuzzy control system could effectively suppress torque ripple, flux ripple and harmonic current.

TM 351