一种基于三电平逆变器的双矢量预测转矩控制

Two-vector-based predictive torque control based on three-level inverter

为了解决三电平逆变器供电的永磁同步电机控制系统中,传统的单矢量预测转矩控制策略导致的电机输出转矩脉动大的问题,文中提出一种基于中点钳位式三电平逆变器的双矢量预测转矩控制策略。该策略通过两次预测模型寻优,在一个控制周期内作用两个电压矢量,达到减少电机输出转矩脉动并同时平衡中点电位的目的。仿真实验验证了所提算法的可行性与优越性。

In order to reduce the torque ripple of the traditional single-vector-based predictive torque control(SVB-PTC)strategy of the permanent magnet synchronous motor(PMSM)drive system powered by a three-level voltage source inverter(3L-VSI),a two-vector-based predictive torque control(TVB-PTC)strategy is proposed for three-level neutral point clamped(NPC)inverter in this paper.The method performs two cost functions to select the two optimal voltage vectors in one sampling period to decrease current ripple and balance neutral point voltage of 3L-VSI.The simulation results of PMSM system verify the feasibility and superiority of the proposed method.