CES Transactions on Electrical Machines and Systems
|
2026, 10(1): 64-76
A Step-Up 25-Level Inverter Topology for Photovoltaic Systems
Full
1 the Department of Energy Technology, Aalborg University, Aalborg 9220, Denmark;
2 the Department of Electrical Engineering, University of Isfahan, Isfahan 8174673441, Iran
About Author:
Fatemeh Esmaeili: Fatemeh Esmaeili received the B.Sc. degree in electrical engineering from Tabriz University of Technology, Tabriz, Iran, in 2020, and the M.Sc. degree from the University of Isfahan, Isfahan, Iran, in 2022, where she is currently pursuing the Ph.D. degree in electrical engineering. Since May 2025, she has been a Visiting Researcher with the Department of Energy Technology, Aalborg University, Denmark. Her research interests include power electronics, multilevel voltage source inverters, switched-capacitor converters, robust and nonlinear controllers of power electronic converters, and renewable energy systems. She was a recipient of the best B.Sc. thesis award from the Power Electronics Society of Iran, in 2020.
Hamid Reza Koofigar: Hamid Reza Koofigar received the B.Sc. degree in electronic engineering, the M.Sc. degree in control engineering, and the Ph.D. degree in electrical engineering from Isfahan University of Technology, Isfahan, Iran, in 2003, 2005, and 2009, respectively. Since February 2010, he has been with the University of Isfahan, where he is currently an Associate Professor with the Department of Electrical Engineering. He was a Visiting Researcher with the Department of Electrical and Computer Engineering, Technical University of Munich (TUM), Munich, Germany, from May 2018 to October 2018 and from July 2019 to September 2019. Also, he was a Visiting Research Fellow with the Department of Systems and Control Engineering, Tokyo Institute of Technology, from February 2025 to September 2025. His current research interests include robust control, large-scale systems, and renewable energy systems. He was awarded the SICE International Scholarship, Japan, in 2012, and the Research Fellowship from Bavarian State Ministry of Sciences, Research and the Arts, Germany, in 2019. He is also a Honorary Fellow of the TUM Institute for Advanced Study.
Frede Blaabjerg: Frede Blaabjerg was with ABB-Scandia, Randers, Denmark, from 1987 to 1988. From 1988 to 1992, he got the PhD degree in Electrical Engineering at Aalborg University in 1995. He became an Assistant Professor in 1992, an Associate Professor in 1996, and a Full Professor of power electronics and drives in 1998 at AAU Energy. From 2017 he became a Villum Investigator. He is honoris causa at University Politehnica Timisoara (UPT), Romania in 2017, Tallinn Technical University (TTU), Estonia in 2018 and Honorary Professor at University of Parma, Italy in 2025.
His current research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, Power-2-X, power quality and adjustable speed drives.
He has received 49 IEEE Prize Paper Awards (one of them acknowledged as Time of Time paper in the IEEE Trans. on Power Electronics - doi: 10.1109/TPEL.2004.833453), the IEEE PELS Distinguished Service Award in 2009, the EPEPEMC Council Award in 2010, the IEEE William E. Newell Power Electronics Award 2014, the Villum Kann Rasmussen Research Award 2014, the Global Energy Prize in 2019 and the 2020 IEEE Edison Medal. In 2023 he received the Hitachi Energy Award, in 2021 the EAWE Scientific Award and in 2020 the EPE Outstanding Achievement Award. He has been Vice-President of the Danish Academy of Technical Sciences. From 2020 he has been a Member of the Royal Danish Academy of Sciences and Letters. Since 2020 he has been the chairman of the Danish Council for Research and Innovation Policy.
doi: 10.30941/CESTEMS.2026.00004
Integration of renewable energy sources into power systems requires efficient multilevel inverters, capable of producing high-quality output voltage with low total harmonic distortion (THD). Conventional multilevel inverters often suffer from high component count, high switching stress, low voltage gain, and increased cost, limiting their practical application. This paper introduces a high-gain novel topology for multilevel inverters with reduced number of total components per level count, low voltage stress on power conductive devices, and minimizing a cost function, which depends on the number of components, standing voltage on switches and diodes, output voltage levels, and gain. The designed topology, which can be applied in photovoltaic (PV) systems, utilizes only one direct current (DC) input supply and a modular structure with the ability of capacitor’s voltage self-balancing. The high gain property and low THD of the proposed topology are two advantages that provide sine output waveform, with no need to a high DC input voltage source. Moreover, generalized topology, consisting of cascaded basic units, has been proposed. A comprehensive method has been proposed to determining the values of DC supplies in this configuration, aiming to minimize redundant switching modes and maximize the voltage levels count. The comparison with some other multilevel inverters confirms the desired performance of the basic version given inverter. A prototype has been also implemented and the experimental results have been obtained to verify the advantages of the proposed 25-level topology.
PDF
79
0
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
