Open AccessElectronic resistor emulators for ferroresonance damping in MV transformers
Author(s) -
Bayona Eduardo,
Azcondo Francisco,
Brañas Christian,
Diaz Javier,
Martínez Raquel,
Manana Mario,
Mínguez Rafael,
Rodríguez Jose Ivan,
Pigazo Alberto
Publication year - 2019
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2018.5242
Subject(s) - resistor , ferroresonance in electricity networks , electrical engineering , transformer , converters , electromagnetic coil , electronic circuit , voltage , low voltage , engineering , electronic engineering , overvoltage , electronic component , distribution transformer , computer science
The occurrence of ferroresonances, due to the presence of voltage transformers in isolated‐neutral in medium‐voltage (MV) distribution grids, results in overvoltages and overcurrents that may damage the connected equipment. To prevent this phenomenon, the protection windings of the MV transformers have to be properly loaded for damping purposes. Mitigation equipment based on resistors, passive/active circuits and static converters have been proposed in the literature. This study proposes a new variety of mitigation equipment based on very simple power electronic converters operated as configurable resistor emulators. The proposed approach is evaluated theoretically and validated experimentally. A resistor emulator proof of concept is designed and applied for damping ferroresonances due to the occurrence of line‐to‐ground faults in isolated‐neutral MV distribution power systems.