基于模糊PI调节器的无刷双馈电机直接转矩控制

Direct Torque Control for Brushless Doubly-Fed Machine Based on Fuzzy-PI Regulator

传统的无刷双馈电机直接转矩控制系统采用滞环控制器,依据转矩误差、定子磁链幅值误差来选择逆变器的开关状态,过扇区时电流与磁链畸变,导致低速时转矩脉动大,影响了系统的控制效果。针对这一问题,提出了一种基于模糊PI调节器的无刷双馈电机直接转矩控制方案,应用模糊理论设计了控制器的参数。仿真结果表明该方法有效改善了电机的动态特性,减少了转矩脉动,提高了转速、转矩控制精度,扩大了直接转矩控制系统的调速范围。

The inverter switch state was based on the torque error and the stator flux amplitude error in the hysteretic controller which was adopted on the traditional direct torque control for the brushless doubly-fed machine, in this way, current and flux were distorted that results torque ripple in low speed range, even more influents control effect of the whole system. According to this problem, a new direct torque control method with fuzzy-PI regulator for the brushless doubly-fed machine was presented, applying the fuzzy theory to design controller parameters. The simulation results showed that the method was effective to improve the dynamic characteristics of the motor, reduce the torque ripple, improve the speed and the torque control precision, expand the direct torque control system of speed range.