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Analysis of DC-DC Converter Stability in Fuel Cell Powered Portable Electronic Systems
작성자 관리자 작성일 2009-08-21
논문집명 IEEE Power Electronics Specialist Conference 발행년도 2006 . 06
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24.Analysis of DC-DC Converter Stability in Fuel Cell Powered Portable Electronic Systems.pdf

L. Palma, M. Harfman-Todorovic, P. Enjeti, Sewan Choi“Analysis of DC-DC Converter Stability in Fuel Cell Powered Portable Electronic Systems”

Abstract : Fuel cell is an emerging power source for portable load), it is necessary to stack many in series to obtain a electronic systems. The steady state DC output of a fuel cell reasonable output voltage. suffers from a 2 to 1 voltage variation from no load to full load. A boost type DC-DC converter is employed to generate a regulated output voltage. The internal impedance of the fuel cell consists of a membrane resistance Rm, and two parallel resistor/capacitor (Rp1-C1 ; Rp2-C2) elements related to the electron transport phenomena in the anode and cathode. It is shown that this internal impedance can influence the dynamic response of the DC-DC converter, often in a manner that _ degrades regulator performance. In this paper the effect of the fuel cell internal impedance on the dynamic performance of the power converter is fully analyzed. Design inequalities are reviewed in per-unit quantities to better understand the interaction between the converter, fuel cell and potential instability conditions. An approach to utilize supercapacitors to enhance stability and improve dynamics is explored. A method to calculate the value of the supercapacitor required is also X detailed. Finally, experimental results obtained on a 30W PEM Fig la An example 30W portable fuel cell system fuel cell system powering a DC-DC boost converter are discussed in detail.