Simulation and control of reactants supply and regulation of air temperature in a pem fuel cells system with capacity of 50 KW

Abstract

Nonlinear models of both aheat exchanger ti-for cathode and a direct current electric motor to drive the compressor are sized and incorporated to the mathematical imi,modelViViof a PEM fuel dicell systemd Biidtiwith capacity ofiti50 kW diiof net poweridintended to propel an electric vehicle. A balance of plant is achieved through several controllers to the main control loops. A Model Reference Adaptive, ViV d di Biidti iti idi dii Controller is used to regulate the oxygen excess ratio manipulating the voltage applied to the electric motor. Proportional-Integral controllers are designed to regulate-, the air temperature Btt-i, entering to the cathode ti-V, and to minimize B-id the pressure difference-between the cathode and anode. Despiteithe non-minimum phase behavior observed in the net power delivered by the stack, the closed-loop system tolerates changes iiin currentdemand imiiand keeps thecompressor mioperating in itsregion of maximumViiefficiency.i.