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.
作者
魏米兰
曾翔君
汪航
谢静
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)
出处
《电力系统自动化》
EI
CSCD
北大核心
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)~~
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
high-voltage grid connected inverter
five level neutral-point clamped （SL-NPC）
flying-capacitor auxiliary armflying-capacitor
