2026-04-22T04:46:35Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/65162025-04-29T13:52:06Zcom_20.500.11984_473col_20.500.11984_478

00925njm 22002777a 4500 dc Ugarte Valdivielso, Jone author Aizpurua Unanue, Jose Ignacio author Barrenetxea, Manex author 2024 Transformers are one of the key assets in AC distribution grids and renewable power integration. During transformer energization inrush currents appear, which lead to transformer degradation and can cause grid instability events. These inrush currents are a consequence of the transformer's magnetic core saturation during its connection to the grid. Transformer cores are normally modelled by the Jiles-Atherton (JA) model which contains five parameters. These parameters can be estimated by metaheuristic-based search algorithms. The parameter initialization of these algorithms plays an important role in the algorithm convergence. The most popular strategy used for JA parameter initialization is a random uniform distribution. However, techniques such as parameter initialization by Probability Density Functions (PDFs) have shown to improve accuracy over random methods. In this context, this research work presents a framework to assess the impact of different parameter initialization strategies on the performance of the JA parameter estimation for inrush current studies. Depending on available data and expert knowledge, uncertainty levels are modelled with different PDFs. Moreover, three different metaheuristic-search algorithms are employed on two different core materials and their accuracy and computational time are compared. Results show an improvement in the accuracy and computational time of the metaheuristic-based algorithms when PDF parameter initialization is used. 1937-4208 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=177527 https://hdl.handle.net/20.500.11984/6516 inrush current Transformers Jiles-Atherton model metaheuristic-based search Probability density function uncertainty ODS 9 Industria, innovación e infraestructura Uncertainty Distribution Assessment of Jiles-Atherton Parameter Estimation for Inrush Current Studies