有源中点钳位多电平逆变器空间矢量调制与三角载波调制统一理论  

Unified Theory between the Space Vector and the Triangular Carrier-Based PWM Strategies in Active Neutral-Point-Clamped Multilevel Inverters

作　　者：王超[1] 何英杰[1] 宋志顺 彭程 Wang Chao;He Yingjie;Song Zhishun;Peng Cheng(School of Electrical Engineering Xi’an Jiao Tong University,Xi’an 710049 China;Xi’an XD Power Systems Co. Ltd,Xi’an 710065 China)

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]西安西电电力系统有限公司,西安710065

出　　处：《电工技术学报》2017年第14期106-115,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50907052);陕西省自然科学基金(2014JQ7271)资助项目

摘　　要：目前有源中点钳位多电平逆变器(ANPC)中三角载波正弦脉宽调制(SPWM)和空间矢量脉宽调制(SVPWM)之间的统一理论尚缺乏系统的分析和研究。在仔细分析其拓扑结构以及开关序列后,针对其相电压冗余开关状态众多的特点,提出一种全新的调制波分解策略。该方法避免了传统调制波分解策略无法确定相电压冗余状态及开关序列的弊端,同时物理意义明确,可以被应用于级联H桥等其他具有众多相电压冗余状态拓扑的统一理论研究。通过给三相正弦调制波注入零序分量,并根据开关管的自由度进行子调制波分解,经SPWM后的信号直接用来触发开关管的开断,从而得到唯一确定的开关序列,且和SVPWM有相同的控制效果。将该理论推广到n电平下任意段数输出,实验验证了该理论的正确性。Currently,regarding the active neutral-point-clamped multilevel inverters(ANPC),theunified theory between the triangular carrier-based sinusoidal pulse width modulation(SPWM)andspace vector pulse width modulation(SVPWM)hasn’t been systematically analyzed.This paper firstlyfocuses on the topology and switching sequence of ANPC,and then proposes a novel method ofdecomposing modulation wave based on the redundancies of phase voltages.This method avoids thedisadvantages of the conventional method that cannot decide the redundant states of phase voltages andthe switching sequences.Meanwhile,the proposed method has definite physical meaning.It can beused in the topology,which has many phase voltage redundant states such as cascaded H-bridgemultilevel inverters.By injecting zero-sequence voltage into the SPWM modulated wave anddecomposing the new modulation wave according to the number of free switches,the signal of SPWMis used to control the switches directly,then the same sequence of SVPWM modulation can be uniquely determined.At last,the unified theory of the SVPWM and SPWM in N level with arbitrary number ofsegments sequence is deduced.Experimental results have verified the unified theory.

关 键 词：调制波分解策略 空间矢量脉宽调制 三角载波正弦脉宽调制 SVPWM与SPWM的统一 

分 类 号：TM464[电气工程—电器]