Hydrogen and fuel cells — the clean energy system

Rohland, B.; Nitsch, Joachim; Wendt, Hartmut

doi:10.1016/0378-7753(92)80084-o

Cited by 90 publications

(24 citation statements)

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“…In practice, the power distribution among the batteries is realized by regulating the charging currents of the batteries. The following equation relates the current from the fuel-cell stack to three charging currents, assuming no power loss in these power converters: (2) where , , and are the charging currents to three batteries, respectively, is the current from the fuel-cell stack, and , , and are the duty cycles of three buck converters, respectively, and they have values between 0-1.…”

Section: System Architecture Designmentioning

confidence: 99%

“…The field application of a portable charging system may be far away from the utility power systems. In this case, the fuel cell, which is emerging as one of the most promising technologies for the future power sources [2], [3], may provide a good solution for powering the portable battery-charging station [4], [5]. However, the limited power supply of the fuel cell and the nonlinearity of both fuel cells and lithium-ion batteries [6]- [9] present difficulties for the system design.…”

mentioning

confidence: 99%

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Control Strategies for Active Power Sharing in a Fuel-Cell-Powered Battery-Charging Station

Jiang

Dougal

2004

IEEE Trans. on Ind. Applicat.

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Abstract-This paper presents an effective system design for a fuel-cell-powered battery-charging station and three control strategies for active power sharing among the batteries. This battery-charging station allows multiple batteries to be simultaneously charged. Three control strategies were investigated to coordinate the active power distribution among the battery-charging branches. The baseline control strategy was equal rate charging. Two advanced control strategies, proportional rate charging and pulse current charging, were compared to the baseline strategy. These control strategies were realized in MATLAB/Simulink, and the current and voltage regulations were implemented using the classical proportional-integral control approach. The system simulation was conducted in the Virtual Test Bed by embedding Simulink objects of the controller and co-simulating with MATLAB. The experimental tests were performed by compiling Simulink codes of the controller and downloading to the dSPACE platform to control real hardware. The simulation and experimental results are given. Experimental tests validate these control strategies.

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Section: System Architecture Designmentioning

confidence: 99%

mentioning

confidence: 99%

Control Strategies for Active Power Sharing in a Fuel-Cell-Powered Battery-Charging Station

Jiang

Dougal

2004

IEEE Trans. on Ind. Applicat.

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“…The following equation relates the current from the fuel cell to three charging currents. (2) where //, h, and I3 are the average current to three batteries respectively, Ifc is the current of the fuel cell, and d,, rf?. dj are the duty cycles of three buck converters respectively and have values between 0 and 1.…”

Section: Pfc=p\+p2+p3mentioning

confidence: 99%

Strategy for Active Power Sharing in a Fuel-Cell-Powered Charging Station for Advanced Technology Batteries

Jiang¹,

Dougal²

2003

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“…Proton exchange membrane fuel cells (PEMFCs) represent the most feasible fuel cell technology for most stationary and portable applications because of the low operating temperature, use of all solid components, high efficiency, high power density, and rapid startup. [1][2][3][4][5] However, the sluggish kinetics of the ORR at the fuel cell cathode greatly limit the power output. [6][7][8][9] Pt used to catalyze the reaction increases the FC cost to an extent that counteracts its advantage of being more efficient than conventional energy sources, imposing a constraint on commercialization of PEMFC devices wherein the total energy conversion is nearly 70%.…”

Section: Introductionmentioning

confidence: 99%

Highly purified CNTs: an exceedingly efficient catalyst support for PEM fuel cell

et al. 2016

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High performance in PEM fuel cells has been achieved using purified CNTs as catalyst support. Pt/CNT nanocomposites were synthesized by reducing Pt salt on CNTs in the presence of ethylene glycol as solvent and in inert atmosphere. The reactions were carried out using both pristine and purified MWCNTs under different pH and atmospheric conditions. The detailed physical and electrochemical characterization revealed that a highly active catalytic surface could be achieved on reducing Pt on defect-free, purified MWCNTs. A further elaborated mechanism is discussed, which illustrates that reduced Pt nanoparticles form a chelate in the presence of nitrogen at neutral pH. This results in increased stability and enhanced catalytic activity. The I-V performance of a unit PEM fuel cell using the synthesized catalyst (with purified CNTs as catalyst support) showed a peak power density of 818 mW cm À2. The performance repeated in triplicate was found to be consistent and exceptionally high (>80%) in comparison with 448 mW cm À2 , the value obtained while employing pristine CNTs as support and tested under similar conditions. Moreover, a novel experimental support was given to confirm the number of electrons involved in the oxygen reduction reaction (ORR) on these highly purified CNT supported catalysts.

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Hydrogen and fuel cells — the clean energy system

Cited by 90 publications

References 0 publications

Control Strategies for Active Power Sharing in a Fuel-Cell-Powered Battery-Charging Station

Control Strategies for Active Power Sharing in a Fuel-Cell-Powered Battery-Charging Station

Strategy for Active Power Sharing in a Fuel-Cell-Powered Charging Station for Advanced Technology Batteries

Highly purified CNTs: an exceedingly efficient catalyst support for PEM fuel cell

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