传统准Z源桥式并网逆变器（GCI）具有允许桥臂直通、直流电压利用率高等优点,但存在体积大、可靠性低和共模漏电流高的缺陷。针对传统准Z源桥式GCI的问题,首先提出一种具有更小体积的新型耦合电感线圈Z源光伏并网逆变器（ZPGCI）及其调制策略。然后,对ZPGCI的运行模态、共模漏电流与桥臂直通状态进行探究,理论研究表明新型ZPGCI不仅具有允许桥臂直通和可靠性高的优点,且可有效抑制传统准Z源桥式GCI的高频共模漏电流。最后,对传统准Z源桥式GCI和新型ZPGCI进行对比实验分析,验证ZPGCI电路设计及其理论推理的正确性。
Abstract
The quasi-Z-source H-bridge grid-connected inverter（GCI） is well known as its no shoot-through problem and high efficiency of DC voltage, but the common-mode leakage current exists in the power frequency cycle. To solve the problems of quasi-Z-source H-bridge GCI, a new Z-Source photovoltaic grid-connected inverter （ZPGCI） with coupled cnductor coil topology is proposed. Also, a unipolar sinusoidal pulse width modulation （USPWM） strategy that can make the common-mode voltage constant is presented. Secondly, operating modes, common-mode leakage current and direct operating mode analysis shows that ZPGCI not only has the advantages of no shoot-through problem and high reliability, but also can eliminate the high-frequency common-mode leakage current of quasi-Z-source H-bridge GCI. At last, the correctness of the novel ZPGCI topology and theoretical analysis are verified by the comparison experiment of traditional quasi-Z-source H-bridge GCI and new ZPGCI circuit.
关键词
光伏发电 /
并网 /
逆变器 /
漏电流 /
Z源
Key words
photovoltaic power /
grid connected /
inverters /
leakage current /
Z-source
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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（SCITLAB-1013）; 现代农业装备与技术教育部重点实验室开放基金（MAET202104）; 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（TB2023025）
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