Stability Analysis and Efficiency Improvement of a Multi-converter System Using Multi-objective Decision Making

doi:10.23919/CJEE.2023.000022

Chinese Journal of Electrical Engineering ›› 2023, Vol. 9 ›› Issue (2): 71-83.doi: 10.23919/CJEE.2023.000022

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Stability Analysis and Efficiency Improvement of a Multi-converter System Using Multi-objective Decision Making

Rashmi Patel^*, R. Chudamani

Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology, Ichchhanath, Athawalines, Surat 395007, India

Received:2022-07-05 Revised:2022-09-30 Accepted:2023-01-20 Online:2023-06-25 Published:2023-06-28
Contact: *E-mail: rkp17.1978@gmail.com
About author:Rashmi Patel received her B.E. degree in Electrical Engineering from the Sardar Vallabhbhai Regional College of Engineering and Technology, Surat, India, in 1999, and her M.Tech. degree in Electrical Engineering from the Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat, India, in 2010. Presently, she is pursuing a Ph.D. under the guidance of Dr. R. Chudamani in the Department of Electrical Engineering, SVNIT. She can be contacted at rkp17.1978@gmail.com.
R. Chudamani received her B.E. degree in Electrical Engineering from the Sardar Vallabhbhai Regional College of Engineering and Technology, Surat, India, in 1990, her M.Tech. degree (Power Electronics) in Electrical Engineering from IIT, Delhi, India, in 1997, and her Ph.D. in Electrical Engineering from IIT, Madras, India, in 2009. Currently, she is a Professor in the Department of Electrical Engineering, SVNIT, Surat, Gujarat, India. In this position, she has been active in both teaching and research. Her research interests are in the areas of power electronics and drives. She can be contacted at rc@eed.svnit.ac.in.

Abstract

Abstract: Multi-converter system is mainly used in advanced automotive systems. Different converters and inverters are taking part in automotive systems to provide different voltage levels in a multi-converter system. It involves constant voltage load (CVL), constant power load (CPL) and other loads. The CPL in such systems offers negative impedance characteristic and it creates a destabilizing effect on the main converter. The effect of destabilization can be reduced by increasing the CVL or inserting parasitic components. Attempts have been made by authors to improve the stability by using parasitics of different components such as switch, diode and inductor. Influence of insertion of parasitics including the series equivalent resistance of the filter capacitor and variation in CVL on the performance of main converter is mathematically analyzed and conflicting behavior between system stability and efficiency is observed. The optimum solution between these two functions is obtained by using multi-objective decision making (MODM) by varying parasitics of different components and CVL. An attempt has been made to demonstrate the effect of CVL load and the parasitics on the stability and efficiency of the main converter, experimentally.

Key words: Multi-converter system, constant power load (CPL), stability, parasitic elements, efficiency and multi-objective decision making (MODM)

Rashmi Patel, R. Chudamani. Stability Analysis and Efficiency Improvement of a Multi-converter System Using Multi-objective Decision Making[J]. Chinese Journal of Electrical Engineering, 2023, 9(2): 71-83.

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Stability Analysis and Efficiency Improvement of a Multi-converter System Using Multi-objective Decision Making

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