A Single-Phase Compact Size Asymmetrical Inverter Topology for Renewable Energy Application

Mohd Faraz Ahmad, M Saad Bin Arif (), Abhishek Bhardwaj, Ahsan Waseem, Jose Rodriguez and Mohamed Abdelrahem ()
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Mohd Faraz Ahmad: Department of Electrical Engineering, Z. H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202001, India
M Saad Bin Arif: Department of Electrical Engineering, Z. H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202001, India
Abhishek Bhardwaj: Department of Electrical Engineering, Z. H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202001, India
Ahsan Waseem: Department of Electrical Engineering, Z. H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202001, India
Jose Rodriguez: Center for Energy Transition, Universidad San Sebastián, Santiago 8420524, Chile
Mohamed Abdelrahem: High-Power Converter Systems (HLU), Technical University of Munich (TUM), 80333 Munich, Germany

Energies, 2025, vol. 18, issue 19, 1-20

Abstract: This paper presents an improved structure of an asymmetrical single-phase multilevel inverter topology with reduced device count. The proposed topology achieves 19 voltage levels at the output using only 12 power switches and 3 DC sources. The topology can be easily extended, resulting in a modular topology with more voltage levels at higher voltages. Moreover, the reliability analysis of the proposed converter results in a higher mean time to fault. The simulation is performed in MATLAB/Simulink, and a hardware prototype is developed to validate the circuit’s performance. A low-frequency Nearest Level Control PWM technique is implemented to generate switching signals and achieves 4.30% THD in output voltage. The PLECS software is used for power loss and efficiency analysis, resulting in a maximum efficiency of 99.08%. The proposed converter has been compared with other MLI topologies to demonstrate its superiority. The results indicate that the proposed topology has proven superior and outperformed other topologies in various parameters, making it suitable for renewable energy applications.

Keywords: multilevel inverter (MLI); asymmetrical; nearest level control (NLC); total standing voltage (TSV); cost factor (CF); reliability; reduce device count; total harmonic distortion (THD); mean time to failure (MTTF) (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: 2025
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