TY - JOUR TI - Modeling and control of proton exchange membrane and solid oxide fuel cells and solar cells DO - https://doi.org/doi:10.7282/T3WM1BHM PY - 2014 AB - This dissertation addresses the modeling and control problems of proton exchange membrane fuel cells (PEMFCs) and solid oxide fuel cells (SOFCs), and solar cells in which the Cuk converter used for maximum power point tracking. Sliding mode control techniques are developed to keep pressures of oxygen and hydrogen at the desired values in PEMFCs and SOFCs and a jump parameter linear system controller is designed for the Cuk converter. For PEMFCs, the sliding mode control strategy is applied to both the 5th-order linearized model and the corresponding nonlinear model. The well-known material balance model is linearized, and it is shown that it is asymptotically stable, controllable, and observable at the unique equilibrium point. Then the sliding surfaces for anode and cathode are designed, and sliding mode controllers are proposed for each sliding surface to make hydrogen and oxygen pressures close to each other and at the desired values despite of the abrupt fuel cell current changes. The sliding mode controller for nonlinear PEMFCs model is also designed. For SOFCs model, the sliding surface for anode side is the same as that for PEMFCs, but that of the cathode side is designed to force oxygen pressure to follow hydrogen pressure. The proposed controllers for fuel cells keep very precisely pressures of hydrogen and oxygen at the require values. Especially, the sliding mode controller for SOFCs makes the pressure difference between hydrogen and oxygen very small in both the transient mode and at steady state. For the jump parameter linear system control technique applied to the Cuk converter, with an accelerated algorithm, we have found the optimal values by changing the duty cycle and applied this technique with the integral action to keep the output voltage of the Cuk converter at the desired value despite of a constant disturbance on the input. The proposed controller with integral action outperforms the averaged converter system that has been most commonly used for DC-DC converter model. KW - Electrical and Computer Engineering KW - Proton exchange membrane fuel cells KW - Solid oxide fuel cells LA - eng ER -