一种新颖的三电平光伏逆变器调制策略研究  

Research on a Novel Modulation Strategy of Three-level Photovoltaic Grid-connected Inverter

作　　者：戴文君[1] 张兴[1] 王付胜[1] 邵章平[1] 

机构地区：[1]合肥工业大学,电气与自动化工程学院,安徽合肥230009

出　　处：《电力电子技术》2014年第1期4-5,14,共3页Power Electronics

基　　金：国家自然科学基金(51277051)~~

摘　　要：针对三电平光伏并网逆变器空间矢量脉宽调制(SVPWM)共模电压高、反相载波调制直流电压利用率低和中点电位不可控等问题,提出一种无小矢量参与合成的调制策略。介绍了该调制策略的矢量合成原则,计算了参与合成的矢量作用时间,分析了该调制策略的低共模电压、高直流电压利用率和中点电位自平衡的优点。最后,搭建10 kW三电平光伏并网逆变器样机并进行实验验证,实验结果证明了理论分析的正确性。According to the space vector pulse width modulation （SVPWM） with large common mode voltage, and ph- ase opposition disposition with low DC voltage utilization and uncontrollable neutral point voltage, a novel modulation strategy of three-level photovoltaie grid-connected inverter without small vectors is proposed.By introducing the vector synthesis principle, calculating the acting time of synthesizing voltage vectors, it is obvious that this modulation strate- gy has advantages of low common mode voltage ,high DC voltage utilization and balanced neutral point voltage.Final- ly, a 10 kW three-level photovohaie grid-connected system is built and the experimental results demonstrate the avail- ability and correctness of the proposed modulation strategy.

关 键 词：逆变器 共模电压 电压利用率 

分 类 号：TM454[电气工程—电器]