Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 36, Issue 2, Pages 1482-1492Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2020.3009628
Keywords
Power system dynamics; Generators; Rotors; Reduced order systems; Power system stability; Shape; Coherency identification; generator aggregation; dynamic model reduction; number of clusters; slow coherency
Categories
Funding
- NWO's ESI-BIDA program [647.003.004]
- Dutch Scientific Council NWO
- General Electric
- VSL
- TSO TenneT
- DSOs Alliander-Qirion
- Stedin
- Enduris
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This paper introduces a new approach for identifying generator slow coherency by minimizing normalized cuts, guiding the choice of group number, and combining with an improved inertial generator aggregation method to produce accurate dynamic equivalents even with a lower number of generator groups.
Identifying generator coherency with respect to slow oscillatory modes has numerous power system use cases including dynamic model reduction, dynamic security analysis, or system integrity protection schemes (e.g., power system islanding). Despite their popularity in both research and industry, classic eigenvector-based slow coherency techniques may not always return accurate results. The multiple past endeavors to improve their accuracy often lack a solid mathematical foundation. Motivated by these deficiencies, we propose an alternative consistent approach to generator slow coherency. Firstly, a new approach is introduced to accurately detect slow coherent generators by effectively minimizing generic normalized cuts. As a by-product, the new approach can also guide the choice of the number of slow coherent groups. Secondly, it is shown that the combination of the the proposed slow coherency approach and an enhanced version of the inertial generator aggregation method allows to produce accurate dynamic equivalents even if the selected number of generator groups is relatively low.
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