engleski

Linear Model of PEM Fuel Cell Power System for Controller Design Purposes

This paper describes a procedure of obtaining linear model with changeable parameters of the fuel cell (FC) power system. The start point was the nonlinear model of the FC power system based on Polymer Electrolyte Membrane (PEM) FC with Nafion 117 membrane. A basic stack voltage model, membrane hydration and anode flow model are included in nonlinear model. Transfer functions of stack voltage and power in relation to stack current and anode inlet flow are determined for different operating points. The influence of membrane humidity on the stack voltage and power is also considered. Parameters of transfer functions are determined by optimization using Matlab. The obtained results of parameters optimization show the significant variations in parameters, depending on the operating point, thus leading the authors to develop some advanced control strategies for the fuel cell power system.

PEM fuel cell; linear model; nonlinear model

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