基于模糊控制的永磁同步电机直接转矩控制

设计了基于模糊控制的永磁同步电机(PMSM)直接转矩控制(DTC)系统,采用模糊控制器取代了传统DTC系统中的磁链和转矩滞环比较器及开关表。仿真结果表明:模糊控制PMSM DTC系统运行良好,可实现四象限运行,与传统开关表相比,可有效减小转矩脉动和平均开关频率。研究了转矩误差论域和零电压矢量对模糊控制性能的影响,并基于转矩角对电压矢量作用的影响规律,提出了考虑转矩角的PMSM模糊直接转矩控制。仿真结果表明:在转矩角较大时,考虑转矩角的PMSM模糊DTC系统可有效减小转矩和磁链脉动,改善控制性能。

Permanent Magnet Synchronous Motor Direct Torque Control Using Fuzzy Control

Permanent magnet synchronous motor (PMSM) direct torque control (DTC) system using fuzzy control was proposed which used fuzzy controllers to replace the hysteresis comparators for stator flux and torque and the switching table. Simulation results show that the proposed fuzzy control system can work properly and realize fourquadrant operation. Compared with the conventional switching table, fuzzy controller could decrease torque ripple and average switching frequency. The effects of universe of torque error and use of zero voltage vector on fuzzy control system were analyzed. Based on the effects of torque angle on voltage vector, a novel fuzzy control PMSM DTC system which took torque angle as the input parameter was proposed. Simulation results show that under large torque angles, the novel fuzzy control system can decrease the ripple of stator flux and torque and improve the control performance compared with conventional fuzzy control.