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10.05.2024 | Original Paper

Enhancing grid stability: a hybrid control strategy for DFIG-based wind turbines to mitigate sub-synchronous oscillations

verfasst von: M. Anju, K. V. Shihabudheen, S. J. Mija

Erschienen in: Electrical Engineering

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Abstract

The global development of wind energy conversion systems is continually evolving, and it has emerged as a crucial element in the functioning of electrical grids across most nations. The doubly fed induction generator (DFIG), which is the most widely used wind turbine, has received considerable attention. Nonetheless, the incorporation of DFIG-based wind turbines into power grids equipped with series compensation renders them susceptible to sub-synchronous resonance (SSR). Within the realm of static SSR, two crucial factors contribute to this phenomenon: the induction generator effect (IGE) and torsional interactions (TI). This study examines the potential use of stability boosting supplementary controllers (SBSC) along with voltage source converter based FACTS devices to mitigate steady-state SSR under weak grid conditions. SBSC consists of a sub-synchronous resonance damping controller (SSRDC) and an inertia-based controller (IBC), which are incorporated into the conventional back-back controller of the DFIG. The SSRDC uses an appropriate input control signal that is highly appreciable for mitigating the IGE effects of SSR and is provided in the best location of the rotor-side converter and grid-side converter. IBC is introduced to suppress the multi-mass drive train TI that occurs owing to the influence of the mechanical dynamics in the electrical network. Variable compensation in the transmission line is effectively provided with the help of a static synchronous series compensator. The controller parameters of the SBSC and flexible AC transmission system (FACTS) devices are optimized using particle swarm optimization. Small-signal stability investigations for the proposed hybrid controllers involve employing the eigenvalue method, and verification of these findings is conducted through time-domain analysis. To substantiate the superior performance of the proposed hybrid controller strategy, an experimental validation is conducted.

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Literatur
Metadaten
Titel
Enhancing grid stability: a hybrid control strategy for DFIG-based wind turbines to mitigate sub-synchronous oscillations
verfasst von
M. Anju
K. V. Shihabudheen
S. J. Mija
Publikationsdatum
10.05.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Electrical Engineering
Print ISSN: 0948-7921
Elektronische ISSN: 1432-0487
DOI
https://doi.org/10.1007/s00202-024-02387-8