DUAL-MODE COMMON-GROUND TYPE INVERTER APPLIED TO PHOTOVOLTAIC GRID CONNECTION

Liang Guozhuang; Han Peisong; Zhao Huanwen; Wang Fei; Cao Yuan; Tian Hanlei

doi:10.19912/j.0254-0096.tynxb.2022-1460

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (1) : 20-24. DOI: 10.19912/j.0254-0096.tynxb.2022-1460

DUAL-MODE COMMON-GROUND TYPE INVERTER APPLIED TO PHOTOVOLTAIC GRID CONNECTION

Liang Guozhuang¹, Han Peisong¹, Zhao Huanwen², Wang Fei³, Cao Yuan⁴, Tian Hanlei¹

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Abstract

Research a novel transformerless dual-mode voltage source inverter（VSI）in which the common ground structure short-circuits the parasitic capacitance and theoretically completely eliminates leakage currents. The inverter consists of a switching-boost-buck（SBB）module integrated with an LC filter network and has a good symmetry of the output waveform. The proposed topology features a wide input voltage range to meet the grid voltage gain, a compact structure, and a simple modulation strategy. Meanwhile, the SBB module allows for soft charging and current stress control within the permissible range. The structural characteristics and operating principle of the inverter are described in detail, a closed-loop controller is designed. The final study results show the feasibility and good performance of the proposed VSI.

Key words

photovoltaic system / inverters / transformerless / boost-buck / leakage current

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Liang Guozhuang, Han Peisong, Zhao Huanwen, Wang Fei, Cao Yuan, Tian Hanlei. DUAL-MODE COMMON-GROUND TYPE INVERTER APPLIED TO PHOTOVOLTAIC GRID CONNECTION[J]. Acta Energiae Solaris Sinica. 2024, 45(1): 20-24 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1460

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