Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

Truong-Duy Duong, Minh-Khai Nguyen, Tan-Tai Tran, Dai- Van Vo, Young-Cheol Lim and Joon-Ho Choi
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Truong-Duy Duong: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
Minh-Khai Nguyen: Faculty of Electrical and Electronics Engineering, Ho Chi Minh City University of Technology and Education, Ho Chi Minh City 700000, Vietnam
Tan-Tai Tran: Faculty of Electrical Engineering Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City 700000, Vietnam
Dai- Van Vo: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
Young-Cheol Lim: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
Joon-Ho Choi: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea

Energies, 2022, vol. 15, issue 9, 1-18

Abstract: In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase the weight, size, and cost of the inverter while decreasing the efficiency and power density. The transformerless topologies have become a good solution. However, the problem is that commode-mode voltage and leakage current can occur via the stray capacitors between the PV array and the ground of the inverter. Various transformerless inverters have been introduced with different techniques, such as reducing the common-mode voltage or eliminating the leakage current. Furthermore, to introduce the development of transformerless PV inverters, especially in three-phase two-level inverter systems, this paper provides a comprehensive review of various common-mode voltage reduction three-phase two-level inverters.

Keywords: common-mode voltage; transformerless topology; three-phase two-level inverter; leakage current; review (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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