基于旁路电容的L型滤波光伏并网逆变器漏电流抑制方法

doi:10.19595/j.cnki.1000-6753.tces.160588

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Abstract In the traditional non-transformer PV grid-connected inverter systems, the additional AC-side or DC-side bypass switches are usually added into the inverters to solve the problem of the leakage current. However, the additional bypass switches increase the system cost, and also need extra driving circuits leading to complex circuit structure and complicated control. Therefore, a new solution based on the bypass capacitor is proposed to suppress the leakage current. The typical L-filter-based PV inverter is considered. Based on the common-mode model, the bypass capacitor scheme is proposed to reduce the leakage current. The effects of different values of bypass capacitances on the common-mode characteristics are discussed. The proposed scheme can effectively bypass the high frequency component of the common-mode voltage, and keep the parasitic capacitors voltage almost constant. Accordingly, the leakage current can be suppressed in an effective way. Finally, the experimental results verify the effectiveness of the proposed solution.

Key words： PV system L-type filter grid-connected inverter bypass capacitor leakage current

Published: 10 October 2017

PACS:

TM46

Fund:国家自然科学基金（51477148）,河北省引进留学人员资助项目（CL201622）和河北省自然科学基金（E2015203407、E2016203156）资助项目

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	Articles by authors
	Guo Zhongnan
	Guo Xiaoqiang
	Li Jian
	Shen Hong
	Wang Baocheng
	Zhang Chunjiang

Cite this article:

Guo Zhongnan,Guo Xiaoqiang,Li Jian等. Leakage Current Suppression Solution of L-Filter-Based Photovoltaic Grid-Connected Inverter with Bypass Capacitors[J]. Transactions of China Electrotechnical Society, 2017, 32(18): 259-266.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160588 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I18/259

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