基于窄脉冲消除的三电平逆变器矢量不对称死区补偿调制策略研究  

Research on Vector Asymmetric Dead-time Compensation Modulation Strategy of Three-level Inverter Based on Narrow Pulse Elimination

作　　者：肖宏伟 何英杰[1] 刘进军[1] 李毅[1] XIAO Hongwei;HE Yingjie;LIU Jinjun;LI Yi(Electrical engineering College,Xi’an Jiao Tong University,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《中国电机工程学报》2021年第4期1386-1397,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51777158);陕西省自然科学基金项目(2018JM5008);西安市科技计划项目(201805034YD12CG18-2)。

摘　　要：针对三电平二极管中点钳位型逆变器因死区效应和窄脉冲造成的负载电流畸变问题,探讨死区补偿过程中一个开关周期相同矢量作用时间分配的不对称性,详细介绍矢量序列在非极端窄脉冲和极端窄脉冲情况下的处理方法。研究一个开关周期同时实现死区补偿和窄脉冲消除方法的矛盾性,提出一种不对称矢量作用时间死区补偿和窄脉冲消除分区执行的调制策略。若合成矢量在死区补偿指特区域内,系统根据交流侧电流方向进行非对称矢量作用时间死区补偿。对含有窄脉冲的矢量区域通过该非极端窄脉冲和极端窄脉冲的判断及消除方法进行处理。采用DSP和FPGA组成的控制系统对该调制方法进行实验。结果表明,该调制方法可有效地降低系统的谐波畸变率值,消除交流侧输出的极端窄脉冲,并解决死区补偿和窄脉冲抑制算法执行过程中相互干扰的问题。For the problem of load current distortion caused by the dead time effect and narrow pulse in the Three Level Neutral Point Clamped Inverter,the asymmetry of the time distribution of the same vector action during a switching period after the dead time compensation was discussed.The processing method of vector sequence in the case of non-extremely narrow pulse and extremely narrow pulse was introduced in detail.The paper studied the contradiction of a switching cycle that simultaneously implements dead time compensation and narrow pulse elimination,and proposed a modulation strategy that performs asymmetric vector action time dead time compensation and narrow pulse elimination partition execution.If the resultant vector was within a specific area of the dead time compensation,the system performs dead time compensation of the asymmetric vector action time according to the direction of the AC side current.The vector area containing narrow pulses was processed by the judgment and elimination methods of non-extreme narrow pulses and extreme narrow pulses in this paper.The control system composed of DSP and FPGA was used to experiment the modulation method.The results show that the modulation method in this paper can effectively reduce the total harmonic distortion(THD)value of the system and solve the problem of narrow pulses.

关 键 词：三电平逆变器 死区补偿 窄脉冲 空间矢量脉宽调制 管压降 

分 类 号：TM464[电气工程—电器]