A Dual Buck Three-Level PV Grid-Connected Inverter

Baojian Ji; Feng Hong; Jianhua Wang; Shengming Huang

A Dual Buck Three-Level PV Grid-Connected Inverter

Vol. 15, No. 4, pp. 910-919, Jul. 2015

10.6113/JPE.2015.15.4.910

Grid-connected inverter

Leakage current

Non-isolated topology

Photovoltaic

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Abstract

The use of a PV grid-connected inverter with non-isolated topology and without a transformer is good for improving conversion efficiency; however, this inverter has become increasingly complicated for eliminating leakage current. To simplify the complicated architecture of traditional three-level dual buck inverters, a new dual Buck three-level PV grid-connected inverter topology is proposed. In the proposed topology, the voltage on the grounding stray capacitor is clamped by large input capacitors and is equal to half of the bus voltage; thus, leakage current can be eliminated. Unlike in the traditional topology, the current in the proposed topology passes through few elements and does not flow through the body diodes of MOSFET switches, resulting in increased efficiency. Additionally, a multi-loop control method that includes voltage-balancing control is proposed and analyzed. Both simulation and experimental results are demonstrated to verify the proposed structure and control method.

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Cite this article

[IEEE Style]

B. Ji, F. Hong, J. Wang, S. Huang, "A Dual Buck Three-Level PV Grid-Connected Inverter," Journal of Power Electronics, vol. 15, no. 4, pp. 910-919, 2015. DOI: 10.6113/JPE.2015.15.4.910.

[ACM Style]

Baojian Ji, Feng Hong, Jianhua Wang, and Shengming Huang. 2015. A Dual Buck Three-Level PV Grid-Connected Inverter. Journal of Power Electronics, 15, 4, (2015), 910-919. DOI: 10.6113/JPE.2015.15.4.910.