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Output feedback transient stabilization and voltage regulation of synchronous generators

Abstract : In this brief note we consider the transient stabilization and voltage regulation problem addressed in Ref. (1) for a synchronous generator connected to an infinite bus. We show how a much simpler output feedback controller can be obtained if a different stability analysis is carried out: a suitable change of coordinates is performed so that advantageous triangularity properties of the regulation error dynamics are highlighted. A novel first order estimator for the uncertain mechanical input power is designed which, in contrast to Ref. (1), is the only adaptation scheme used by the controller. The innovative crucial step in the presented control design relies on relaxing the constraint imposed by the backstepping techniques adopted in Ref. (1) and constituted by the required availability of the regulation/tracking error variables: the converging estimate of the mechanical input power directly becomes the reference value for the electrical power and allows for the straightforward computation of the uncertain power angle constant value guaranteeing voltage regulation at steady-state.
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Cristiano Maria Verrelli, G. Damm. Output feedback transient stabilization and voltage regulation of synchronous generators. International Journal of Robust and Nonlinear Control, Wiley, 2012, 22 (13), pp.1495-1504. ⟨10.1002/rnc.1762⟩. ⟨hal-02936784⟩

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