Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Non-isolated H10 three-phase inverter for leakage current suppression

  • Ma, Haixiao (College of Automation, Nanjing University of Posts and Telecommunications) ;
  • Lan, Zhaixing (College of Automation, Nanjing University of Posts and Telecommunications) ;
  • Chen, Zefeng (College of Automation, Nanjing University of Posts and Telecommunications)
  • Received : 2020.03.31
  • Accepted : 2020.06.30
  • Published : 2020.09.20
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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.

Keywords

Acknowledgement

This work was sponsored by NUPTSF (Grant nos. NY215128 and NY217064).

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