In this paper, we propose adaptive nonlinear controllers for the Single-Ended Primary\nInductance Converter (SEPIC).We also consider four distinct situations: AC-DC, DC-DC, Continuous\nConduction Mode (CCM) and Discontinuous Conduction Mode (DCM). A comparative analysis\nbetween classic linear and nonlinear approaches to regulate the control loop is made. Three adaptive\nnonlinear control laws are designed: Feedback Linearization Control (FLC), Passivity-Based Control\n(PBC) and Interconnection and Damping Assignment Passivity-Based Control (IDAPBC). In order to\ncompare the performance of these control techniques, numerical simulations were made in Software\nand Hardware in the Loop (HIL) for nominal conditions and operation disturbances. We recommend\nadaptive controllers for the two different situations: Adaptive Passivity-Based Feedback Linearization\nControl (APBFLC) for the PFC (Power Factor Correction) AC-DC system and IDAPBC-BB (IDAPBC\nBased on Boost converter) for the regulator DC-DC system.
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