Oxygen Excess Ratio control of PEM Fuel Cell System Based on a Fractional Order model Approximation

In order to effectively control takes place, an accurate model is required. High order and complicated system needs for being reduced during analysis and control design. A nonlinear model of PEMFC was primarily linearized to an 8th order. In this paper the fractional calculus is gained to reduce the linear model of FEMFC into a lower order fractional dynamic. In this approach two: Charef's approximation method and a heuristic fractional order approximation algorithm are used. Thereafter a controller will be designed for the lower order approximated system. The quality of the designed controller will be assessed through simulation. The controller will be applied to the linearized and also the original nonlinear model in presence of load disturbance. The same procedure will be gained when the system is reduced through the Hankel matrix. The outcome verifies performance of the fractional order control using a Heuristic algorithm, with respect to the control in the original model, in terms of reducing the negative peak and also the speed of the response.

کلیدواژه ها:

Oxygen Excess Ratio ، Charef's approximation ، Fractional Order model ، PEMFC ، Control