RESEARCH ON LEAKAGE CURRENT SUPPRESSION OF A NEW THREE-PHASE BUCK-BOOST PHOTOVOLTAIC INVERTER

Wang Liqiao; Lin Jian; Zhu Wentong; Zhang Jiamu; Dong Ziliang

doi:10.19912/j.0254-0096.tynxb.2020-1199

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (7) : 101-108. DOI: 10.19912/j.0254-0096.tynxb.2020-1199

RESEARCH ON LEAKAGE CURRENT SUPPRESSION OF A NEW THREE-PHASE BUCK-BOOST PHOTOVOLTAIC INVERTER

Wang Liqiao¹, Lin Jian¹, Zhu Wentong¹, Zhang Jiamu², Dong Ziliang¹

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Abstract

The common mode current is one of the key factors limiting the widespread use of transformerless PV inverters. Thus, A new three-phase Buck-Boost inverter which can be used in solar PV systems is proposed in this paper to solve this problem. This paper firstly introduces the topology of the inverter, analyzing its working principle, deriving the expression of its common-mode voltage at any operating mode. The influence of the Sinusoidal Pulse Width Modulation （SPWM） on common-mode voltage （CMV） existing in this inverter and leakage current are then analyzed. Finally, the above scheme is verified by the simulation and experimental setup. According to the results and data from the experiments, this new inverter is effective and feasible.

Key words

transformerless PV inverter / leakage current / SPWM / step-up/down

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Wang Liqiao, Lin Jian, Zhu Wentong, Zhang Jiamu, Dong Ziliang. RESEARCH ON LEAKAGE CURRENT SUPPRESSION OF A NEW THREE-PHASE BUCK-BOOST PHOTOVOLTAIC INVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(7): 101-108 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1199

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