Dynamic Model of a Virtual Air Gap Reactor

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-08-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
10
2521-2530
Series
IEEE Transactions on Power Delivery, Volume 38, issue 4
Abstract
Variable reactors have been a vital component of power networks for decades, where they have been used as fault-current limiting devices or for reactive power compensation. Traditionally, modifying the inductance of predominantly mechanically operated variable reactors requires seconds to minutes. In contrast, virtual air gap (VAG) reactors can change the inductance within milliseconds, potentially improving power system stability. Existing dynamic models of VAG reactors cannot capture the entire system dynamics, limiting their applicability for simulations in the time-domain. This research presents two dynamic VAG reactor models, one with and one without core losses. The models capture all significant system dynamics using electromagnetic principles and VAG reactor flux linkage behavior. The proposed models were experimentally validated using a small VAG reactor. Over a broad operating range, both models accurately reproduce the dynamic behavior, transient response, and dominant harmonics of the small VAG reactor. Consequently, the models may be used for a variety of applications, such as time-domain simulations, harmonic analysis, and the development of suitable controllers for VAG reactors. In addition, engineers may use the core loss omitting model as a VAG reactor design tool, as the actual reactor is not required for modeling.
Description
Publisher Copyright: Author
Keywords
Dynamic model, Finite element analysis, finite element method (FEM), Inductors, Magnetic cores, Magnetization, Power system dynamics, variable reactor, virtual air gap (VAG), Voltage measurement, Windings
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Citation
Sevsek , D , Hinkkanen , M , Kukkola , J & Lehtonen , M 2023 , ' Dynamic Model of a Virtual Air Gap Reactor ' , IEEE Transactions on Power Delivery , vol. 38 , no. 4 , pp. 2521-2530 . https://doi.org/10.1109/TPWRD.2023.3245123