Solid Oxide Fuel Cells (SOFCs) are electrochemical devices operating at high temperatures, directly transforming chemical energy into electrical energy, offering significant potential as a clean and efficient power generation technology. The primary challenge concerning SOFCs is the intricacy of regulating the output voltage. This challenge is attributed to the strong nonlinearity, swift load variations, and restricted fuel flow. The primary objective of the SOFC system's control is to maintain a constant level of the output voltage respecting the safety intervals of the fuel utilization rate and the oxy/Hyd ratio. In this context, a new adaptive fuzzy PID controller (FPID) approach is proposed to control the output voltage of the SOFC nonlinear system, where two FPIDs controllers were used one for the hydrogen flow and the other for the oxygen flow. Simulation results are presented to demonstrate the effectiveness and accuracy of the proposed approach in front of other control strategists that use a constant ratio between the reactants.

Solid Oxide Fuel Cell (SOFC); nonlinear system; fuzzy controller; PID controller; fuzzy PID controller.