Research Of A Current-fed Full-bridge Converter And A Src Integrated Three-port Converter

As people are much concerned with the fossil fuels exhaustion and theenvironmental problems caused by the conventional power generation, renewableenergy sources are now widely used. The main subject of this paper is multiportconverters for renewable energy application. Compared with conventional multipleconverters, multiport converters, which promise low-cost, flexible, and more efficientenergy processing, are a promising concept for sustainable electricity generators.A three-port dc-dc converter composed of a current-fed full bridge, a seriesresonant full-bridge, a voltage-fed full bridge and a high frequency multi-windingtransformer is presented in this paper. Soft-switching conditions for the MOSFETs incurrent-fed full-bridge converter and the power flow control are achieved by thephase-shifted PWM control. Besides, the ZCS conditions for series resonant converterand the voltage-fed full bridge could be realized with the LC resonant tank, and theresonant modes judgment method is adopted to control the power for resonantconverter. With combination of the phase-shifted PWM control and the resonantmodes judgment method, the proposed converter can draw power from two differentsources and transfer it to the load simultaneously and individually.Firstly, the detail analysis of operation principle is provided for the proposedconverter. Secondly, based on the switching sequences and the control techniquesadopted, the logic control circuits are designed, of which the correctness is verified bythe simulation result. Furthermore, in order to apply the proposed converter in therenewable energy power generation system, the work modes of the converter and theenergy management scheme are studied in this thesis, and the theory analysis isvalidated through the simulation result. In addition, the main components are designedto build the experimental platform, and based on the control chip Xilinx’s Spartan-3 FPGA XC3S400, the effectiveness of the control principle and the feasible of theproposed converter are verified by the experimental result.