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We consider a Th\'evenin equivalent circuit capturing the dynamics of a powergrid as seen from the point of common coupling with a power electronicconverter, and provide a solution to the problem of online identification ofthe corresponding circuit parameters. For this purpose, we first derive alinear regression model in the conventional abc coordinates and next design abounded observer-based composite identifier that requires local measurementsand knowledge of the grid frequency only. An extension that guaranteesexponential convergence of the estimates, under the additional assumption ofknowledge of the grid X/R ratio, is further provided. The performance of theproposed identifier, which subsumes a conventional gradient descent algorithm,is illustrated via detailed computer simulations.

An Observer-Based Composite Identifier for Online Estimation of the Thevenin Equivalent Parameters of a Power System