Application of a decentralized adaptive output feedback based on backstepping to power systems

This paper considers an application of the decentralized adaptive output feedback scheme developed previously by the authors (1995) to maintain global robustness to parametric and dynamic uncertainties among interconnections in large-scale power systems and also rejection of any bounded, unmeasurable disturbances entering the system. The proposed design utilizes only feedback from local rotor angle measurements. The scheme is applied to a two axis (fourth order) model of the generator with a second order turbine/governor model and an IEEE type I excitation control (fifth order) for each subsystem. The design presented is also applicable to higher order models of the generator and turbine/governor system. Furthermore, the design methodology proposed here obviates the need for controller redesign and therefore maintains robust connective stability if individual subsystems are appended or removed.