Design and Control Aspects Of Two Input Integrated DCDC Converters For Constant Power Loads

Abstract

This thesis investigates modelling and controller design aspects of Two-Input newlineIntegrated DC-DC Converters, specifically focusing on DC microgrid systems which are newlineconnected to Constant Power Loads (CPLs). The switched mode converters are energy efficient newlinecompared to linear regulators. These converters find applications for single as well as multiple newlinesources. DC-DC converters play a vital role to tap the power from multiple sources and feed to newlineeither a common DC bus or stand-alone loads. These structures allow both flexibility and newlinereliability in DC-power conversion. Multiple sources feeding multiple loads though demand a newlinegreater number of converters but provide better reliability, whereas only one converter newline(Integrated converter) is sufficient enough to draw power from multiple sources feeding to a newlinecommon dc bus. newlineA single integrated converter that accommodates different types of sources forms a newlinemulti-input converter (MIC) or a multi-port converter (MPC). Such MIC can continue to newlineoperate even if some of the DC sources fail. The MICs/MPCs are broadly classified into newlineisolated and non-isolated topologies. Based on the power flow, MICs are classified as newlineunidirectional or bi-directional converters. In case of power processing using two DC sources, newlinea two-input integrated converter is a viable option for power control as it uses less number of newlinecomponents and is simple in structure. In this study, two different innovative two input newlineintegrated converter topologies are considered: (i)Two-Input Integrated Modified Buck SEPIC newline(TII-MBS) and (ii) Novel Two-Input Integrated High Gain Boost SEPIC (TII-HGBS). The TIIMBS converter is designed to achieve an output voltage of 48V from the input voltages E1=60V newlineand E2=36V. The TII-HGBS converter, designed to achieve an output voltage of 100V from newlinethe input voltages E1=24V and E2=24V. and for these converters the modelling aspects and newlinedesign of converter circuit parameters were explored in detail. newline