空间矢量调制型凸极同步电动机直接转矩控制

Direct Torque Control of Salient Pole Synchronous Motor Using Space Vector Modulation

凸极同步电动机的定子磁链变化时间常数通常较小,采用传统的双滞环直接转矩控制(DTC)策略使得电机的电磁转矩和定子磁链存在着较大的脉动。将空间矢量调制型直接转矩控制(SVM-DTC)策略引入到凸极同步电动机,优化的空间电压矢量组合实现了转矩、磁链误差的精确补偿,同时保证功率器件开关频率恒定。仿真结果表明,与凸极同步电动机传统DTC相比,基于SVM-DTC策略的控制系统能够使电机定子电流畸变率明显降低;转矩和定子磁链脉动显著减小;转矩响应速度快;运行平稳。

The salient pole synchronous motor has typically quite small time constant of stator flux linkage in transient. Therefore the electromagnetic torque and stator flux linkage existed large ripples if the traditional direct torque control （DTC） strategy with torque and flux linkage hystereses was adopted. The space vector modulation （SVM） technique was introduced into the conventional salient pole synchronous motor DTC system, and was analyzed thoroughly, in order to obtain an optimal resultant voltage vector for accurate torque and flux linkage control and constant switching frequency, The simulation results indicate that the total harmonic distortion （THD） of stator current is decreased greatly and the torque and flux linkage ripples dramatically reduce based on the SVM-DTC strategy which also has an excellent dynamic performance.