CHB逆变器移幅载波调制法及其功率均衡控制策略  

Amplitude Shifted Carrier Modulation Method and Its Power Balance Control Strategy for CHB Inverter

作　　者：李宋 肖云煌 LI Song;XIAO Yunhuang(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013, China;Operation Department,Guangzhou Metro,Guangzhou 510310,China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013 [2]广州地铁集团有限公司运营事业总部,广州510310

出　　处：《电力系统及其自动化学报》2019年第1期25-30,46,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51767007);江西省工业科技支撑计划资助项目(20161BBE50057);江西省自然科学基金资助项目(20161BAB206157);江西省教育厅自然科学基金资助项目(GJJ180306)

摘　　要：针对级联H桥(CHB)多电平逆变器移幅载波调制法存在的功率均衡问题,提出了上、下载波1/4输出周期互换和上、下载波相邻间隔互换两种不同的功率均衡控制策略。通过改变三角载波的排列方式,使得不同H桥单元的功率器件开关频率和导通时间接近。调整逆变器各H桥单元的输出电压波形,在保证输出电压波形质量的同时能够实现各H桥单元在一个输出周期内的功率均衡。文中对提出的两种不同的调制策略进行了详细地分析和对比研究。仿真结果验证了这两种均衡策略的可行性。In consideration of the problem of power imbalance in the amplitude shifted carrier modulation for cascaded H-bridge ( CHB ) multilevel inverter , two different power balance control strategies are proposed , in which 1/4 output cycles and the nearby intervals of uplink/downlink carriers are commuted , respectively. The switching frequency and turn-on time of power devices in different H-bridge cells can approach each other through changing the arrangement of triangular carriers. The output voltage waveform of each H-bridge cell is adjusted , such that the power balance among H-bridge cells in one output cycle can be achieved while guaranteeing the quality of output waveform. The two new mod-ulation strategies are analyzed and compared in detail , and simulation results verify the validity of the two balance strat-egies.

关 键 词：级联型多电平逆变器 移幅载波调制法 功率均衡控制 

分 类 号：TM464[电气工程—电器]