Type of Document	Dissertation
Author	Deng, Yuhang
Author's Email Address	yd05@fsu.edu
URN	etd-09182010-231030
Title	Study of Multiphase Bidirectional DC-DC Converter Interfacing with Energy Storage for Fuel Cell Vehicle Using Power Hardware-In-the-Loop Concept
Degree	Doctor of Philosophy
Department	Electrical and Computer Engineering, Department of
Advisory Committee	Advisor Name Title Simon Foo Committee Chair Hui Li Committee Co-Chair Chris Edrington Committee Member Ming Yu Committee Member Mei Zhang University Representative
Keywords	Energy Storage Bidirectional DC-DC Converter Fuel Cell Vehicle Power Hardware-In-the-Loop Controller Hardware-In-the-Loop
Date of Defense	2010-09-09
Availability	unrestricted
Abstract Being the interface between Energy Storage Element (ESE) and DC bus in Fuel Cell Vehicle (FCV), the high power density bidirectional dc-dc converter is an essential component of the energy management system. In this dissertation, two novel multiphase bidirectional dc-dc converters featuring high power density for FCV application are proposed. Also in this dissertation, the averaged models of the proposed three-phase bidirectional DC-DC converters are developed. In order to study the bidirectional dc-dc converter interfacing with ESE to supply and absorb the electric energy in the FCV system, both the Controller Hardware-In-the-Loop (CHIL) method and Power Hardware-In-the-Loop (PHIL) method are proposed and applied. Phase I is a pure software simulation of the original FCV system. In this phase, the bidirectional dc-dc converter and all other FCV power train components are modeled and simulated on Real Time Digital Simulator (RTDS). As a result of the fast computation through distributed parallel processing of the RTDS, the simulation can provide an accurate enough reference for the following phases. Phase II includes a controller in the simulation loop. The bidirectional dc-dc converter controller is implemented with a real hardware Digital Signal Processor (DSP), which replaces the simulated control system. This Controller Hardware-In-the-Loop increases the realism of the simulation and eliminates the unpredictable error from modeling the controller. The results from the initial phases can be utilized in the Phase III, where the actual hardware bidirectional dc-dc converter prototype is then interfaced with the ESE using Power Hardware-In-the-Loop. The main challenge of this PHIL is the requirement for a highly dynamic bidirectional Simulation-Stimulation (Sim-Stim) interface. This dissertation describes three different interface algorithms (Current-Voltage amplification, Voltage-Current amplification and Voltage-Voltage amplification). The closed-loop stability of the resulting PHIL system is then analyzed in terms of time delay and sampling rate. A prototype of the bidirectional Sim-Stim interface is designed and implemented in hardware to study the bidirectional dc-dc converter interfacing with ESE for FCV using PHIL. The results demonstrate the effectiveness of this approach.
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