A Comparative Review on Single Phase Transformerless Inverter Topologies for Grid-Connected Photovoltaic Systems

Md. Faruk Kibria (), Ahmed Elsanabary, Kok Soon Tey, Marizan Mubin and Saad Mekhilef ()
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Md. Faruk Kibria: Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Ahmed Elsanabary: Institute of Power Engineering (IPE), Universiti Tenaga Nasional, Kajang 43000, Malaysia
Kok Soon Tey: Faculty of Computer Science and Information Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
Marizan Mubin: Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Saad Mekhilef: Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia

Energies, 2023, vol. 16, issue 3, 1-24

Abstract: The uses of grid-connected photovoltaic (PV) inverters are increasing day by day due to the scarcity of fossil fuels such as coal and gas. On the other hand, due to their superior efficiency, lower cost, smaller size, and lighter weight when compared to inverters with transformers, transformerless inverters for low-voltage single-phase grid-tied photovoltaic (PV) systems have recently attracted more interest. However, there are some specific challenges, especially leakage current issues, which must be adequately addressed to ensure the safety standards of the grid codes. A variety of topologies has been presented in the literature to eliminate the leakage current using the decoupling or clamping technique. However, choosing an appropriate topology after comparison is challenging because each topology has a unique set of parameters. In this paper, the authors have selected a common set of parameters and simulated all the selected eighteen well-known topologies in MATLAB/Simulink to fairly analyze and compare their common mode characteristics and other output parameters. In addition, the power loss distribution of every switch of each of the eighteen topologies was calculated and presented to better understand the insight of the topologies.

Keywords: AC decoupling; DC decoupling; grid-connected inverter; leakage current; mid-point clamping; solidly clamping; total common mode voltage; transformerless inverter (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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