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Title: Dynamic performance improvement in boost and buck-boost-derived power electronic converters
Keywords: boost, buck-boost, cascade buck-boost,fuzzy logic controller ,Tri-state, power converter
Issue Date: 24-Nov-2005
Citation: KANAKASABAI VISWANATHAN (2005-11-24). Dynamic performance improvement in boost and buck-boost-derived power electronic converters. ScholarBank@NUS Repository.
Abstract: The dynamic performance of boost and buck-boost-derived dc-dc converters is slow. While small-signal response is slow due to the presence of an RHP zero in the control-transfer-function, large-signal response is slow due to the linear nature of employed controllers. In this thesis, solutions to overcome these dynamic response problems are proposed. The solutions are obtained in two ways namely, by enhancements in the design of converter/controller and by modifying the converter topology. Under the first approach, improvement in dynamic performance is achieved by using a a??Non-linear-Function-Controller (NLFC)a?? proposed in this thesis. Under the second approach, a novel a??tri-statea?? class of converters that have an extra-degree of control-freedom, using which excellent dynamic performance improvement becomes possible is proposed. The control-freedom offered by tri-state boost converter is exploited by a??constant-Do,a?? direct-dual-mode, and indirect-dual-mode control methods. Finally, extension of tri-state concept for applications in single-phase power-factor-correction to achieve performance improvement is also studied.
Appears in Collections:Ph.D Theses (Open)

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