https://orcid.org/0000-0002-1475-8555
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Abstract
In this paper, a generalized algorithm is proposed to balance the DC-link (DCL) voltage across each power cell of n number of cascaded H-bridge multilevel inverter (CHBMLI), using dc-dc converter, fed from multi solar photovoltaic (SPV) array for standalone application under varying environmental conditions, i.e. variation in radiation and temperature. Due to variation in the environmental conditions, the power flow through each H-bridge modules changes and subsequently the DCL voltage might change. This leads to unequal DC levels in the pole voltage of the CHBMLI, which results in different switching stress of the power modules. Therefore, the life span of the switches will get reduced. To maintain equal switching stress on each H-bridge module, duty cycle of the boost DC to DC converters is varied according to the proposed algorithm. It maintains equal voltage at the output of the boost converter under uniform/non-uniform environmental conditions. To operate the CHBMLI, the triangular carrier phase-shifted modulation has been used. The proposed algorithm as well as performance of the multi-SPV fed CHBMLI is simulated using PSCAD/EMTDC software for three-bridge seven-level CHBMLI. The experimental results are obtained using E4360 Modular Solar Array Simulator and Spartan 3AN FPGA controller for two-bridge five-level CHBMLI.
ACKNOWLEDGEMENT
This research supported by the Science and Engineering Research Board (SERB), DST, Government of India, under the SERB grant number SR/S3/EECE/0053/2012.
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Notes on contributors
Alok Kumar Singh
Alok Kumar Singh received the BTech degree in electrical and electronics engineering from the Uttar Pradesh Technical University Lucknow, India, in 2009, the MTech degree in power electronics and ASIC design from Motilal Nehru National Institute of Technology, Allahabad, India, in 2012. He is currently an assistant professor with the Department of Electrical Engineering, Adani Institute of Infrastructure Engineering, Ahmedabad, India. Prior to this from 2012 to 2013, he was an assistant professor with Anand Engineering College, Agra, India and from 2013 to 2016, he was working as a project staff in SERB (DST) project on solar PV system and completed the PhD degree from the Department of Electrical Engineering, Motilal Nehru National Institute of Technology, Allahabad, India, in 2018. His research interests include power electronics, multilevel and dc-dc converters for renewable energy source applications.
Rahul Sharma
Rahul Sharma was born in Jaipur, India, in 1993. He received the bachelor’s degree from College of Technology and Engineering, Udaipur, India, in 2014, the Master’s degree (Gold Medallist) from Motilal Nehru National Institute of Technology, Allahabad, India, in 2016, and currently pursuing PhD degree from the Indian Institute of Technology, Delhi, India, all in electrical engineering. His areas of research interests include power electronics, custom power devices, power quality, and renewable energy systems. Email: [email protected]
Rajesh Gupta
Rajesh Gupta received the bachelor’s degree from the Madan Mohan Malviya Engineering College, Gorakhpur, India, in 1993, the master’s degree from the Birla Institute of Technology, Ranchi, India, in 1995, and the PhD degree from the Indian Institute of Technology, Kanpur, India, in 2007, all in electrical engineering. He is currently a professor with the Department of Electrical Engineering, Motilal Nehru National Institute of Technology, Allahabad, India. Prior to this from 1995 to 1999, he taught in the Institute of Engineering & Technology, Lucknow, and Govind Ballabh Pant Engineering College, Pauri Garhwal, India. His research interests include control of power electronics converters, multilevel converters, distribution system compensation, and power conversion from renewable sources of energy. Dr Gupta is a reviewer for the IEEE Transcations on Industrial Electronics and IET Power Electronics. He guided 10 PhD students and 45 masters students. Email: [email protected]