具有飞跨电容辅助桥臂的五电平高压并网逆变器  

Five-level High-voltage Grid-connected Inverter with Flying-capacitor Auxiliary Arm

作　　者：魏米兰 曾翔君[1] 汪航 谢静[1] 龚德林 WEI Milan, ZENG Xiangjun, WANG Hang, XIE Jing, GONG Delin(School of Electrical Engineering, Xi＇ an Jiaotong University, Xi＇ an 710049, 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：《电力系统自动化》2018年第7期130-138,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51477134)~~

摘　　要：结合当前五电平高压并网逆变器拓扑研究现状,提出了一种具有飞跨电容辅助桥臂的五电平中点钳位(5L-NPC)逆变器拓扑,并利用飞跨电容技术实现了中点自平衡,可作为10kV等级的风力发电、光伏等大功率并网逆变器或静止同步补偿器(STATCOM)。首先分析了造成常规5LNPC逆变器3个直流中点不平衡的原因,随后详细说明了飞跨电容技术实现中点自平衡的原理,并给出了相关参数的选取范围,最后通过实验验证了所提拓扑的正确性与可行性。Based on the research status of the topology of five level high-voltage grid connected inverter, a five-level neutral point clamped （5L-NPC） inverter topology with flying capacitor auxiliary arm is proposed, and the self balancing of neutral point is realized by flying capacitor technology. The proposed converter can be used as a high-power grid-connected inverter or a static synchronous compensator （STATCOM） in the 10 kV wind power conversion system and photovoltaic power generation system. Firstly, the causes of unbalancing problem of the three neutral points in a conventional 5L NPC inverter are analyzed. Then, the self-balancing principle of the neutral-point by using the flying-capacitor technology is explained in detail, and the selection range of the relevant parameters is given. Finally, the correctness and feasibility of the proposed topology are verified.

关 键 词：高压并网逆变器 五电平中点钳位 飞跨电容辅助桥臂 飞跨电容 

分 类 号：TM464[电气工程—电器]