多电平逆变器简化空间矢量调制算法

A Simplified Space Vector Pulse Width Modulation Algorithm for Multi-Level Inverter

基于两电平的多电平逆变器空间矢量脉宽调制简化算法是根据参考矢量的幅值和相位确定参考矢量终点所在小六边形区域,先把参考矢量分解成多电平基本矢量与两电平参考矢量,然后借助传统的两电平七段法合成两电平参考矢量,得到两电平优化开关序列,最后将该优化开关序列与多电平基本矢量相结合得到多电平优化开关序列。该算法计算基本矢量作用时间及生成多电平优化开关序列的复杂性与多电平逆变器的电平数无关。二极管钳位型三电平逆变器的仿真与实验结果验证了所提方法的正确性与可行性。

A simplified space vector pulse width modulation algorithm based on two-level modulation for multi-level inverter is proposed. The algorithm determines the small hexagonal region which the reference vector belongs to according to the amplitude and phase angle of the reference vector. Firstly the reference vector is decomposed into a multi-level basic vector and a two level reference vector, then the two level reference vector is synthesized and the two level optimized switching sequences are obtained by using the traditional two-level seven segments modulation method. Finally the multi-level optimized switching sequences are obtained by adding the multi-level basic vector to the optimized two level switching sequences. The complexity of calculating the basic vector dwelling time and generating the optimized switching sequences has nothing to do with the specific level of the inverter. The correctness and feasibility numbers of the proposed algorithm results of a diode clamped three level inverter. are verified by the simulation and experimental