Coordinated Converter-Charger for Hybrid Fuel Cell-Battery Power Sources

Both the fuel cell and battery have timely dynamic response to the step-profile load input. The current overshoot followed by a voltage undershoot behavior happen the step-up load, particularly. These phenomena are closely related to mass transfer mechanisms such as the water/gas transport by the redistribution of membrane water content in the fuel cell and the charge double-layer effect in the battery. When the load demand is beyond the rated power of the fuel cell system, the battery immediately powers to the load with a transient discharging current especially in the step-profile load power. This study presents a new control strategy for hybrid fuel cell-battery power sources with transient and overshoot considered. The results show that the proposed hybrid fuel cell-battery power source not only acting as a power stabilizer but also dynamically satisfying the step-profile load demand.

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Evaluation of the water-gas shift and CO methanation processes for purification of reformate gases and the coupling to a PEM fuel cell system

Journal of Power Sources ◽

10.1016/j.jpowsour.2004.12.032 ◽

2005 ◽

Vol 145 (1) ◽

pp. 50-54 ◽

Cited By ~ 40

Author(s):

Marcelo S. Batista ◽

Elisabete I. Santiago ◽

Elisabete M. Assaf ◽

Edson A. Ticianelli

Keyword(s):

Fuel Cell ◽

Pem Fuel Cell ◽

Cell System ◽

Water Gas Shift ◽

Fuel Cell System ◽

Co Methanation ◽

Water Gas

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A Dynamic Model for a Closed-Loop Continuous Energy System Using Solar Power

Energy Conversion and Resources ◽

10.1115/imece2006-14550 ◽

2006 ◽

Author(s):

Bradford M. Culwell ◽

Shripad T. Revankar ◽

Radhika Kotha

Keyword(s):

Fuel Cell ◽

Solar Energy ◽

Dynamic Model ◽

Closed Loop ◽

Solar Power ◽

Cell System ◽

Solar Array ◽

Fuel Cell System ◽

Power Sources ◽

Regenerative Fuel Cell

One key advantage of solar power over more traditional power sources is its modular nature, allowing it to be used in remote locations or as a supplementary source of power. Recent studies show fuel cell technology as a good means of providing a continuous supply of electricity from a solar array, eliminating drawbacks caused by solar energy's cyclical nature. The high power density of such a system makes it ideal for use in areas such as unmanned aerial vehicles and space exploration. Due to the complexity and relatively high initial cost of current fuel cells, however, optimization of such a system is critical. This paper examines a dynamic model of a solar regenerative fuel cell system built in MATLAB Simulink. The system uses a polymer electrolyte membrane (PEM) fuel cell, running on stored hydrogen and oxygen, to produce power when solar energy is insufficient. It uses a PEM based electrolyzer to produce hydrogen and oxygen from water when solar energy exceeds demand. The mathematical model includes modules for each component, including solar cells, fuel cell, electrolyzer, and auxiliary systems. Models were built based on fundamental physics to the extent practical. The individual modules were first tested for their performances and then were integrated to form an integrated solar powered regenerative fuel cell system. The simulations were carried out for a day and night cycle and the results show that the closed loop system can be operated providing continuous supply of electric power.

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Investigation of Operating Parameters in Conjunction with Catalyst Deactivation of the Water-Gas Shift Reactor in a Fuel Cell System

ECS Transactions ◽

10.1149/06501.0099ecst ◽

2015 ◽

Vol 65 (1) ◽

pp. 99-114 ◽

Cited By ~ 6

Author(s):

D. Krekel ◽

R. C. Samsun ◽

J. Pasel ◽

M. Prawitz ◽

R. Peters ◽

...

Keyword(s):

Fuel Cell ◽

Catalyst Deactivation ◽

Cell System ◽

Water Gas Shift ◽

Operating Parameters ◽

Fuel Cell System ◽

Water Gas

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Dynamic Modeling of a Solid Oxide Fuel Cell System in Modelica

ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2 ◽

10.1115/fuelcell2010-33053 ◽

2010 ◽

Author(s):

Daniel Andersson ◽

Erik A˚berg ◽

Jinliang Yuan ◽

Bengt Sunde´n ◽

Jonas Eborn

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Steam Reforming ◽

Cell System ◽

Solid Oxide ◽

Water Gas Shift ◽

Oxide Fuel ◽

Fuel Cell System ◽

Water Gas ◽

Stack Model

In this study a dynamic model of a solid oxide fuel cell (SOFC) system has been developed. The work has been conducted in a cooperation between the Department of Energy Sciences, Lund University, and Modelon AB using the Modelica language and the Dymola modeling and simulation tool. Modelica is an equation based, object oriented modeling language, which promotes flexibility and reuse of code. The objective of the study is to investigate the suitability of the Modelica language for dynamic fuel cell system modeling. A cell electrolyte model including ohmic, activation and concentration irreversibilities is implemented and verified against simulations and experimental data presented in the open literature. A 1D solid oxide fuel cell model is created by integrating the electrolyte model and a 1D fuel flow model, which includes dynamic internal steam reforming of methane and water-gas shift reactions. Several cells are then placed with parallel flow paths and connected thermally and electrically in series. By introducing a manifold pressure drop, a stack model is created. The stack model is applied in a complete system including an autothermal reformer, a catalytic after-burner, a steam generator and heat exchangers. Four reactions are modeled in the autothermal reformer; two types of methane steam reforming, the water-gas shift reaction and total combustion of methane. The simulation results have been compared with those in the literature and it can be concluded that the models are accurate and that Dymola and Modelica are tools well suited for simulations of the transient fuel cell system behaviour.

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