电流型并网逆变器（CSGCI）具有允许桥臂直通,升压性能好等优点,但现有CSGCI不仅需设置重叠时间,且存在高频共模漏电流较大的问题。针对该缺陷,该文首先提出一种无需设置重叠时间的无变压器型CSGCI拓扑及其单极性SPWM调制策略;其次对CSGCI的工作模态和共模漏电流进行分析;然后详细分析模态转换时的换流过程,研究表明：新型CSGCI不仅高频共模漏电流得到了有效抑制,且在无需设置重叠时间的情况下,能顺利完成换流;最后,通过硬件电路实验验证了该逆变器设计和理论分析的正确性。
Abstract
Current source grid-connected inverter （CSGCI） is well known as its no shoot-through problem and superior boost characteristics. However, existing CSGCI not only needs to set the overlap time, but also has the problem of high frequency common mode leakage current. To overcome these imperfections, a new transformerless CSGCI with non-overlapping time （TCSGCI-NT） topology and its unipolar SPWM strategy are proposed. Then, the operating modes and common-mode leakage current of the TCSGCI-NT are analyzed. The commutating current during mode conversion is explored in detail. The analysis result shows that the TCSGCI-NT has the advantages of the non-overlapping time and can completely meet the condition of eliminating common-mode leakage current. Finally, the experimental results verify the correctness of the TCSGCI-NT circuit design and theoretical analysis.
关键词
光伏发电 /
并网 /
逆变器 /
漏电流 /
无重叠时间
Key words
photovoltaic generation /
grid connected /
inverter /
leakage current /
non-overlapping time
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基金
厅市共建智能终端四川省重点实验室开放基金课题（SCITLAB-1013）; 宜宾职业技术学院院级科研项目（ZRKY21ZDXM-02; ybzy20cxtd02）; 四川省博士后科研项目特别资助项目（耦合电感Z源光伏并网逆变器拓扑及其漏电流抑制技术）
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