SINGLE-PHASE NON-ISOLATED BUCK-BOOST INVERTER WITH LEAKAGE CURRENT SUPPRESSION

Wang Liqiao; Xing Xiaoshan; Guan Chenggong

doi:10.19912/j.0254-0096.tynxb.2022-0704

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (9) : 141-150. DOI: 10.19912/j.0254-0096.tynxb.2022-0704

SINGLE-PHASE NON-ISOLATED BUCK-BOOST INVERTER WITH LEAKAGE CURRENT SUPPRESSION

Wang Liqiao, Xing Xiaoshan, Guan Chenggong

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Abstract

In this paper, a single-phase single-stage non-isolated inverter is proposed. The inverter is designed by the Sepic circuit symmetrically and cascaded with the H-bridge circuit, which can not only suppress the leakage current but also realize the Buck-Boost inverter. The inductance and capacitance parameters are small with non-electrolytic capacitors in the topology. Besides, its modulation method is simple and easy to implement, which is suitable for small and medium power PV inverter systems. Firstly, this paper introduces the topology and working principle of the new inverter, in which the principle of suppressing the leakage current in the common mode loop of the system is analyzed in detail. Secondly, according to the different flow modes of intermediate inductor current, different modulation methods are adopted. The Buck-Boost capability is analyzed by formula, and the inductance and capacitance parameters in the topology are designed. Finally, the simulation and experimental verification are completed. The results are consistent with the theoretical analysis.

Key words

single-phase non-isolated inverter / leakage current / Buck-Boost / non-electrolytic capacitor

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Wang Liqiao, Xing Xiaoshan, Guan Chenggong. SINGLE-PHASE NON-ISOLATED BUCK-BOOST INVERTER WITH LEAKAGE CURRENT SUPPRESSION[J]. Acta Energiae Solaris Sinica. 2023, 44(9): 141-150 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0704

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