2026-04-05T10:53:50Zhttps://recercat.cat/oai/request

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

An observer-based composite identifier for online estimation of the Thévenin equivalent parameters of a power system Zonetti, Daniele Ortega, Romeo Cisneros, Rafael Bobtsov, Alexey Mancilla David, Fernando Gomis Bellmunt, Oriol 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 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) 2024-03-15 Article https://onlinelibrary.wiley.com/doi/10.1002/asjc.3345 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124292OB-I00/ES/ANALISIS ELECTRICO DE REGIMEN PERMANENTE Y CORTOCIRUCITO, Y REPRESENTACION EQUIVALENTE PARA SISTEMAS ELECTRICOS MODERNOS CON ELECTRONICA DE POTENCIA Y GENERACION RENOVABLE/ http://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International John Wiley & sons