Four-Switch Five-Level Common-Ground Transformerless Inverter

Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:
Conference Proceeding
2022 14th Seminar on Power Electronics and Control, SEPOC 2022, 2022, 00, pp. 1-6
Issue Date:
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This paper presents a common-ground five-level transformerless inverter for solar photovoltaic (PV) applications. In the proposed inverter, the grid neutral line is directly connected to the negative pole of the dc bus eliminating the common-mode leakage current which is a critical problem in grid-connected PV systems. Moreover, the proposed inverter has only four power switches, making the first five-level common-ground topology with less than six switches found in the recent literature. In addition to low switch count, only two switches are operating in high-frequency. The operation modes, the design guidelines as well as a modulation strategy are presented. Simulation and experimental results are obtained to demonstrate the performance of the proposed inverter.
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