Ultracapacitor Boosted Fuel Cell Hybrid Vehicle

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Title: Ultracapacitor Boosted Fuel Cell Hybrid Vehicle
Author: Chen, Bo
Abstract: With the escalating number of vehicles on the road , great concerns are drawn to the large amount of fossil fuels they use and the detrimental environmental impacts from their emissions . A lot of research and development have been conducted to explore the alternative energy sources . The fuel cell has been widely considered as one of the most promising solutions in automobile applications due to its high energy density , zero emissions and sustainable fuels it employs . However , the cost and low power density of the fuel cell are the major obstacles for its commercialization . This thesis designs a novel converter topology and proposes the control method applied in the Fuel Cell Hybrid Vehicles (FCHVs ) to minimize the fuel cell's cost and optimize the system's efficiency . Unlike the previous work , the converters presented in the thesis greatly reduce the costs of hardware and energy losses during switching . They need only three Metal -Oxide -Semiconductor Field -Effect Transistors (MOSFETs ) to smoothly accomplish the energy management in the cold start , acceleration , steady state and braking modes . In the converter design , a boost converter connects the fuel cell to the DC bus because the fuel cell's voltage is usually lower than the rating voltage of the motor . In this way , the fuel cell's size can be reduced . So is the cost . With the same reason , the bidirectional converter connected to the ultracapacitor works at the buck pattern when the power is delivered from the DC bus to the ultracapacitor , and the boost converter is selected when the ultracapacitor provides the peaking power to the load . Therefore , the two switches of the bi -directional converter don't work complementarily but in different modes according to the power flow's direction . Due to the converters' simple structure , the switches' duty cycles are mathematically analyzed and the forward control method is described . The fuel cell is designed to work in its most efficient range producing the average power , while the ultracapacitor provides the peaking power and recaptures the braking power . The simulation results are presented to verify the feasibility of the converter design and control algorithm .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -886
Date: 2010-01-14


Ultracapacitor Boosted Fuel Cell Hybrid Vehicle. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -886 .

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