Non‑isolated H10 three‑phase inverter for leakage current suppression

Haixiao Ma; Zhaixing Lan; Zefeng Chen

Non‑isolated H10 three‑phase inverter for leakage current suppression

Haixiao Ma

Zhaixing Lan

Zefeng Chen

Vol. 20, No. 5, pp. 1139-1148, Sep. 2020

10.1007/s43236-020-00121-8

Non-isolated photovoltaic power generation system

Leakage current

H10 inverter

Clamping circuit

Common-mode voltage (CMV)

Abstract

In recent years, an increasing amount of attention has been paid to non-isolated photovoltaic power generation systems, where leakage current suppression is one of the key issues to be addressed. In view of this problem, this paper proposes a novel ten-switch three-phase circuit that is referred to as an H10 inverter. This circuit is obtained by adding two isolating switches and a clamping circuit to the traditional three-phase inverter (H6 inverter). The working principle of the proposed system is analyzed. On the basis of the logic relationship between the common-mode voltage (CMV) and the switching states, a control strategy combining carrier modulation and logic operation is proposed. With this proposed control strategy, the H10 inverter can effectively reduce the variation of the CMV and improve the leakage current suppression. Finally, simulation and experimental platforms are built for the inverter system, and the obtained results are compared with those of a traditional three-phase inverter to verify the correctness of the theoretical analysis.

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Cite this article

[IEEE Style]

H. Ma, Z. Lan, Z. Chen, "Non‑isolated H10 three‑phase inverter for leakage current suppression," Journal of Power Electronics, vol. 20, no. 5, pp. 1139-1148, 2020. DOI: 10.1007/s43236-020-00121-8.

[ACM Style]

Haixiao Ma, Zhaixing Lan, and Zefeng Chen. 2020. Non‑isolated H10 three‑phase inverter for leakage current suppression. Journal of Power Electronics, 20, 5, (2020), 1139-1148. DOI: 10.1007/s43236-020-00121-8.