A trajectory sensitivity method for the identification of nonlinear excitation system models

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Abstract
A sensitivity method for identifying parameters of nonlinear synchronous generator models is proposed and applied to the identification of the parameters of IEEE type ST3 and DC1 models. The method generates the sensitivities directly from the nonlinear model and does not require linearization. The use of singular values and singular vectors to detect the identifiability of parameters is discussed. The identification of the parameters requires, in general, very few iterations. The presence of noise in data reduces the identifiability of the parameters. However, reasonable approximations can be obtained if the parameters to be identified are chosen carefully.

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