Design and Implementation of a Soft-Switched Multiport Bidirectional Converter

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Mirzahosseini, Ramin | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42935 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Tahami, Farzad
Abstract:
In recent years, multiport bidirectional converters have been a center of attention in renewable energy systems. This research focuses on three-port bidirectional converters. First, series resonant bidirectional converter is precisely analyzed. This analysis includes sinusoidal, exact state space and small signal analysis through phasor concept. This converter can work in higher switching frequencies and higher power ratings in comparison with common DAB bidirectional converter due to its inductor impedance cancellation. To increase power rating a three-phase version is proposed which has reduced output filter capacitance. Then, three-port bidirectional resonant converter is proposed and analyzed. Soft-Switching regions are obtained through analysis and three different designs with different desired Soft-Switching types are proposed for an example. There are desired soft-switching types depend on the switches chosen in each design. In addition, a decoupling network is utilized to control the three-port converter after the small signal model of the converter is obtained. Simulation and experimental results are also presented
Keywords:
Soft-Switching ; Resonant Converter ; Resonant Frequencies ; Bidirectional Converter ; Three Port Bidirectional Converter

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