In order to suppress the torque pulsations in the drive system of a common busbar open-winding permanent magnet synchronous traction motor and the zero-sequence currents generated by the common-mode voltage and the third-harmonic counteracting potential acting on the zero-axis circuit,a self-immune cascade model predictive current control method was proposed. First,the first effective voltage vector was used to increase the q-axis current and the second effective voltage vector was used to decrease the q-axis current in the first level. This new filtering combination rule grouped the two effective vectors based on their effect of the q-axis current for optimization and allocated the action time optimally. Second,the zero-axis components of the effective voltage vectors selected in the first level were locally optimized in the second level;and in the third level,the zero-axis current components generated by the system in the first and second levels were optimized by using zero vectors with opposite polarity to suppress them with precise allocation of the action time. Then,in the fourth level,the switching state was locally optimized for the voltage vectors selected in the first three levels,and the optimal voltage vector combination of low switching frequency states was determined to act on the inverter. Finally,the self-immunity control was introduced to reduce the overshoot of the speed regulation during the motor startup and acceleration process and the proposed strategy was compared with dual-vector model predictive current control in both steady-state and dynamic simulations. The results show that the proposed strategy has a good suppression effect on torque pulsation,zero-axis current,total harmonic distortion rate,switching frequency and speed regulation overshoot. It avoids the weight coefficient rectification in the multi-objective cost function of the traditional model predictive control,which has an obvious improvement on the control performance of the system. The results of the study provide a reference for further research on weak magnetism control of the drive system of permanent magnet synchronous traction motor with common busbar open-winding and the application of the drive control system to locomotive traction.
关键词
开绕组永磁同步牵引电机/级联模型预测/转矩脉动/零轴电流/自抗扰控制
Key words
open-winding permanent magnet synchronous traction motors/cascade model prediction/torque pulsation/zero-sequence current/self-immune control
维普
万方数据