永磁同步电机模糊直接转矩控制研究

直接转矩控制系统具有良好的动态响应,但转矩及磁链的脉动较大.针对这一问题,用模糊控制器代替传统直接转矩控制系统中的滞环比较器,将电机定子磁链误差、电磁转矩误差及定子磁链空间角三个量作为模糊控制器的输入,进行模糊处理,并在模糊控制器中根据预先制定的模糊推理规则进行模糊推理运算,从而最优的选择出电机所需要的电压矢量,作为模糊控制器的输出,直接控制逆变器的开关状态.仿真结果表明,模糊直接转矩控制在很大程度上可以改善传统直接转矩控制的定子磁链和电磁转矩脉动,并有很好的动态特性.

Fuzzy Direct Torque Control System of Permanent Magnet Synchronous Motors

Direct torque control has excellent dynamic performance, but it has large ripple on stator flux and electromagnetic torque. For the sake of improving the problems, fuzzy logic controller is introduced into the system instead of the hystereesis comparator. In the fuzzy DTC system, the stator flux linkage error, electromagnetic torque error and flux linkage angle of PMSM are all properly fuzzified into several fuzzy subsets to optimally select the voltage space vector in order to smooth the torque, flux linkage and quicken their response. Simulation results indicate that the performances of fuzzy DTC strategy are superior to these of the conventional DTC.