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This paper focuses on observer based fault reconstruction for a class ofnonlinear uncertain systems with Lipschitz nonlinearities. An adaptive-gainSuper-Twisting (STW) observer is developed for observing the system states,where the adaptive law compensates the uncertainty in parameters. The inherentequivalent output error injection feature of STW algorithm is then used toreconstruct the fault signal. The performance of the proposed observer isvalidated through a Hardware-In-Loop (HIL) simulator which consists of acommercial twin screw compressor and a real time Polymer Electrolyte Membranefuel cell emulation system. The simulation results illustrate the feasibilityand effectiveness of the proposed approach for application to fuel cellsystems.

Adaptive High Order Sliding Mode Observer Based Fault Reconstruction for a Class of Nonlinear Uncertain Systems: Application to PEM Fuel Cell System