摘要
传统二极管钳位的三电平逆变器运行时,中线电流会造成逆变器直流电压不平衡并影响输出效果。同时逆变器中的开关损耗也是在高电压、大容量应用中必须考虑的问题。为了减少逆变器的损耗及改善直流电压不平衡,本文提出一种直流电压自平衡新型三电平准谐振逆变器及其控制算法。给予直流侧电压自平衡能力,并利用软开关去降低逆变器的开关损耗。通过仿真模型,证明了其结构及控制方案的可行性,并与传统三电平逆变器进行了比较。
This paper presents a combination of a quasi-resonant DC-link（QRDCL） inverter and a generalized three-level inverter.QRDCL inverter can provide a zero voltage condition for the power devices.The voltage stres-ses of the power devices and the switching losses of the inverter can be reduced.Generalized multilevel inverter to-pology provides an alternative way in high level inverter implementation.The generalized multilevel topology gives the inverter a self voltage balancing ability without any assistance from extra circuits.Control strategy of a general-ized three-level QRDCL inverter is proposed.Simulation results of the inverter are also presented to prove the feasi-bility of a generalized three-level QRDCL inverter.
出处
《电工电能新技术》
CSCD
北大核心
2010年第4期31-34,61,共5页
Advanced Technology of Electrical Engineering and Energy
关键词
准谐振直流环节
软开关
多电平逆变器
Quasi-Resonant DC Link（QRDCL）
soft-switching
multilevel inverter
