A Family of Non-Isolated Photovoltaic Grid Connected Inverters without Leakage Current Issues

Baojian Ji; Jianhua Wang; Feng Hong; Shengming Huang

A Family of Non-Isolated Photovoltaic Grid Connected Inverters without Leakage Current Issues

Vol. 15, No. 4, pp. 920-928, Jul. 2015

10.6113/JPE.2015.15.4.920

Common-mode voltage

Leakage current

Non-isolated inverter

Photovoltaic

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Abstract

Transformerless solar inverters have a higher efficiency than those with an isolation link. However, they suffer from a leakage current issue. This paper proposes a family of single phase six-switch transformerless inverter topologies with an ac bypass circuit to solve the leakage current problem. These circuits embed two unidirectional freewheeling current units into the midpoint of a full bridge inverter, to obtain a freewheeling current path, which separates the solar panel from the grid in the freewheeling state. The freewheeling current path contains significantly fewer devices and poor performance body diodes are not involved, leading to a higher efficiency. Meanwhile, it is not necessary to add a voltage balancing control method when compared with the half bridge inverter. Simulation and experiments are provided to validate the proposed topologies.

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Cite this article

[IEEE Style]

B. Ji, J. Wang, F. Hong, S. Huang, "A Family of Non-Isolated Photovoltaic Grid Connected Inverters without Leakage Current Issues," Journal of Power Electronics, vol. 15, no. 4, pp. 920-928, 2015. DOI: 10.6113/JPE.2015.15.4.920.

[ACM Style]

Baojian Ji, Jianhua Wang, Feng Hong, and Shengming Huang. 2015. A Family of Non-Isolated Photovoltaic Grid Connected Inverters without Leakage Current Issues. Journal of Power Electronics, 15, 4, (2015), 920-928. DOI: 10.6113/JPE.2015.15.4.920.