Article
A Compact Digitally Controlled Fuel Cell/Battery Hybrid Power Source
Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC
IEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 07/2006; DOI: 10.1109/TIE.2006.878324 Source: IEEE Xplore

Dataset: Graphical and mathematical analysis of fuel cell/battery passive hybridization with K factors
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ABSTRACT: h i g h l i g h t s A novel graphical and mathematical method is utilized for analyzing hybrid system. A piecewise linear model of a fuel cell and a linear I–V model of a battery are suggested. The Kfactors are firstly proposed, K R ¼ R B =R F and K V ¼ ðV B0 À V L Þ=ðV F0 À V L Þ. The current sharing relationship is quantitatively revealed, i.e. K I ¼ K V =K R . a b s t r a c t Hybridization is a promising method for enhancing the quality of the power supplying system including fuel cells which is not capable of meeting load demand statically or dynamically. Though there have been much research advances on hybridization, systematic studies are insufficient to reveal fundamental characteristics. In this study, we systematically categorize passive hybrid topologies, which are battery state of charge (SoC) controlled, fuel cell relative humidity (RH) controlled, and battery–fuel cell controlled, respectively. Each hybrid topology can be analyzed based on the graphical and mathematical method for fundamentally understanding and designing the hybrid system. First, in the graphical method, I–V curves, which represent the characteristics of the intrinsic properties of each device, are used for the understanding of the current sharing and power sharing of the hybrid system. Second, the mathematical method based on the relations deduced from each characterization curve is used for a more detailed understanding on topology to find key factors of hybridization. The results show that the power sharing of hybridization is strongly connected to the fundamental properties of each device, and it can be expressed by a combination of two factors K V and K R , which represent the electrical potential and internal resistance ratio of each device, respectively. 
Conference Paper: Investigation of various operating modes of fuelcell/ultracapacitor/multiple converter based hybrid system
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ABSTRACT: Fuel cells (FC) suffer with low energy density and hence required to be hybridized with Energy Storage Systems(ESS) like ultra capacitors (UC) or batteries to cater to load profiles that have periodic demands for higher power. Generally converters are connected to each ESS and hence they idle most of the time as they are operated only during peak demands. This paper proposes various operating modes in which the converters can be used in interleaved or isolated configurations upon predetermined load demand patterns. This paper analyses various operating modes and proposes control strategy to utilize the converters effectively. A multi objective energy and power management algorithm is derived based on predicted/predefined load pattern to meet tight load regulation, operate fuel cells at MPPT, regeneration and protect fuel cell from starvation. The merits of the proposed configuration are illustrated through theoretical and experimental investigation.Power Electronics and Drive Systems (PEDS), 2013 IEEE 10th International Conference on; 01/2013 
Article: Graphical and mathematical analysis of fuel cell/battery passive hybridization with K factors
[Show abstract] [Hide abstract]
ABSTRACT: h i g h l i g h t s A novel graphical and mathematical method is utilized for analyzing hybrid system. A piecewise linear model of a fuel cell and a linear I–V model of a battery are suggested. The Kfactors are firstly proposed, KR = RB / RF and KV = VB0 VL/ VF0 VL. The current sharing relationship is quantitatively revealed, i.e. KI / KV =KR . Abstract: Hybridization is a promising method for enhancing the quality of the power supplying system including fuel cells which is not capable of meeting load demand statically or dynamically. Though there have been much research advances on hybridization, systematic studies are insufficient to reveal fundamental characteristics. In this study, we systematically categorize passive hybrid topologies, which are battery state of charge (SoC) controlled, fuel cell relative humidity (RH) controlled, and battery–fuel cell controlled, respectively. Each hybrid topology can be analyzed based on the graphical and mathematical method for fundamentally understanding and designing the hybrid system. First, in the graphical method, I–V curves, which represent the characteristics of the intrinsic properties of each device, are used for the understanding of the current sharing and power sharing of the hybrid system. Second, the mathematical method based on the relations deduced from each characterization curve is used for a more detailed understanding on topology to find key factors of hybridization. The results show that the power sharing of hybridization is strongly connected to the fundamental properties of each device, and it can be expressed by a combination of two factors K V and K R , which represent the electrical potential and internal resistance ratio of each device, respectively.Applied Energy 01/2014; 114:135145. · 5.26 Impact Factor
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