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This article deals with unknown deception attacks detection of hydroelectric generator. Such cyber attacks are switching disturbances that affect the input information transmitted from the power system stabilizer to the plant through a constrained communication network. The generator dynamics can be modeled as an augmented state model, whereas the unknown input reconstruction is obtained from a modified Kalman filter recursions under communication constraints. The obtained design ensures the minimization of disturbances with accurate cyberattack monitoring.

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