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oai:recercat.cat:2117/4062742026-01-22T04:31:15Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Zonetti, Daniele author Ortega, Romeo author Cisneros, Rafael author Bobtsov, Alexey author Mancilla David, Fernando author Gomis Bellmunt, Oriol author 2024-03-15 We consider a Thévenin equivalent circuit capturing the dynamics of a power grid as seen from the point of common coupling with a power electronic converter and propose a solution to the problem of online identification of the corresponding circuit parameters. For this purpose, we first derive a linear regression model in the conventional abc coordinates that, unfortunately, suffers from severe lack of identifiability properties. In spite of this fact, we design a bounded observer-based composite identifier that, requiring only local measurements and knowledge of the grid frequency, ensures global boundedness of the parameters estimation error and convergence to a practically small residual set. An extension that guarantees exponential convergence of these errors to zero, in the case that the grid is dominantly inductive, is further provided. The performance of the proposed identifier, which subsumes a conventional gradient descent algorithm, is illustrated via detailed computer simulations. The work of Oriol Gomis-Bellmunt was supported by the Institució Catalana de Recerca i Estudis Avançats (ICREA), Spain Academia Program. Ministerio de Ciencia e Innovación (Proyecto Equired) (PID2021-124292OB-I00). Postprint (published version) Àrees temàtiques de la UPC::Enginyeria elèctrica Adaptive control systems Power electronics Adaptive control Identification theory Power electronics Power systems Stability theory Sistemes adaptatius Electrònica de potència An observer-based composite identifier for online estimation of the Thévenin equivalent parameters of a power system