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Representative operating and contingency scenarios for the design of UFLS schemes

L. Sigrist, I. Egido, E.F. Sánchez-Úbeda, L. Rouco

This paper studies an approach to identify representative operating and contingency (OC) scenarios for the design of underfrequency load-shedding (UFLS) schemes. In small isolated power systems, contingency scenarios are outages of generating units. Usually, only N-1 outages are considered. In this paper, simultaneous outages of several units are also taken into account. Data mining techniques such as K-Means and Fuzzy C-Means algorithms are used to group scenarios in terms of system frequency and to identify representative OC scenarios. The approach has been applied to the design of UFLS schemes of two of the Spanish isolated power systems. The results have also been compared to the common practice of scenario selection. Clustering techniques yielded to satisfactory results, i.e., representative OC scenarios can be identified. Furthermore, these representative OC scenarios cover a wider range of possible system responses than the scenarios selected following the common practice.

Keywords: Clustering methods, frequency stability, load shedding

IEEE Transactions on Power Systems. Volume: 25 Issue: 2 Pages: 906-913

Journal Impact Factor: JCR impact factor 5.255 (2017)

DOI reference: DOI icon 10.1109/TPWRS.2009.2031839    

Published on paper: May 2010.

    Topics research:
  • *Stability: large disturbance stability, tuning of frequency loadshedding schemes, excitation control, small disturbance stability, tuning of power system stabilizers, identification of AVR and governor models
  • *Forecasting and data mining

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