Z-SOURCE PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH COMMON-MODE LEAKAGE CURRENT INHIBITION

Dai Yunzhong; Tang Hao; Liu Mingxuan; Chen Yongli; Yan Caixiu; Yang Xinmao

doi:10.19912/j.0254-0096.tynxb.2022-1776

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (3) : 517-522. DOI: 10.19912/j.0254-0096.tynxb.2022-1776

Z-SOURCE PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH COMMON-MODE LEAKAGE CURRENT INHIBITION

Dai Yunzhong^1,2, Tang Hao¹, Liu Mingxuan¹, Chen Yongli¹, Yan Caixiu¹, Yang Xinmao¹

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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.

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photovoltaic power / grid connected / inverters / leakage current / Z-source

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Dai Yunzhong, Tang Hao, Liu Mingxuan, Chen Yongli, Yan Caixiu, Yang Xinmao. Z-SOURCE PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH COMMON-MODE LEAKAGE CURRENT INHIBITION[J]. Acta Energiae Solaris Sinica. 2024, 45(3): 517-522 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1776

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