WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 24, 2025
State Variable Interactions of Dual Input SEPIC Converters
Authors: , , ,
Abstract: This article addresses the level of interactions between state variables and their eigenmodes of two-input integrated (TII) converters. Here, two-input Buck-SEPIC (TI-BS) and two-input modified Buck-SEPIC (TI-MBS) converters are considered for analysis. Small-signal models are obtained in continuous time and as well as discrete time, and eigenvalues are computed using system matrices “Aavg” and “Phi” respectively. The characteristic equations of TII converters are of fourth order and have four eigenvalues. Here, Participation Factors (PF) analysis is performed to identify the level of interaction between Converter State-Variables In Converter Eigen-Modes (CSVICEM), Converter Eigen-Modes In Converter State-Variables (CEMICSV), and Converter Eigen-Modes In Converter Output Variables (CEMICOV). The participation factor analysis helps to identify the sensitive elements that are present in the converter configuration. The simulation studies are performed for these converters considering a 36 V / 60 V to 48 V, 500 W dc-dc converter for Electric Vehicles. Here, continuous and discrete-time models are obtained, and using these models, CSVICEM, CEMICSV, and CEMICOV are computed, and experimental validation is performed through Hardware in Loop (HIL) using OPAL-RT.
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Keywords: Electric Vehicle, Buck-SEPIC converter, Modified Buck-SEPIC converter, Transfer Function Matrix, Participation Factor Analysis, Hardware in Loop, state-transition matrix, Single Ended Primary Inductor Converter (SEPIC)
Pages: 207-227
DOI: 10.37394/23201.2025.24.24