Font Size: a A A

Wide Voltage-gain Range Boost DC-DC Converter For Fuel Cell Vehicles

Posted on:2019-08-18Degree:MasterType:Thesis
Country:ChinaCandidate:L ZhouFull Text:PDF
GTID:2382330593951563Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Traditional fossil fuel resources are depleting quickly,but their continued use contributes to increasing pollution.Development of clean energy systems is essential.With regard to transport,fuel cell vehicles can be considered one of the most essential applications for clean-energy.Fuel cell vehicles can provide clean propulsion power with zero emission,as well as higher energy utilization.However,the use of fuel cells brings challenges,particularly with their low output voltage and “soft” output characteristic.So the fuel cells must be interfaced to the main DC link bus through a step-up DC-DC converter with a wide range of voltage-gain.In addition the input current ripple of the converter for fuel cells must be low enough to prevent accelerated reduction of the life time of the fuel cell.Several typical DC-DC converters has been discussed in this paper.Combining the advantages of these converters,single-switch,wide voltage-gain range boost DC-DC converter and input-parallel output-series DC-DC boost converter with a wide voltage-gain range have been proposed in this paper,respectively.Diode-capacitor structure has been used in single-switch,wide voltage-gain range boost DC-DC converter.The capacitors are charged in parallel and discharged in series which can improve the voltage-gain of the converter.As for the input-parallel output-series DC-DC boost converter with a wide voltage-gain range,an interleaved structure is adopted in the input side to reduce input current ripple.Two capacitors are connected in series on the output side to achieve a high voltage-gain.The operating principles and steady-state characteristics of two converters are presented and analyzed in this paper.Two 400 V,1.6kW,20 kHz experimental prototypes are developed for the converters,and the converters both achieve the wide voltage-gain range(3.3~8).The experimental results validate the effectiveness and feasibility of the proposed converters and their suitability as a power interface for fuel cell vehicles.
Keywords/Search Tags:Fuel cell vehicles, Current ripple, Wide voltage-gain range, Interleaved structure, Diode-capacitor
PDF Full Text Request
Related items