A Method for the Design of UFLS Scheme with Dynamic Correction


This paper presents an adaptive Under Frequency Load Shedding scheme based on Wide Area Measurement System. Due to the lack of enough adaptability to the operation state of the system, the traditional successive approximation under frequency load shedding method will cause excessive cut or undercut problems inevitably. This method consists first in a comprehensive weight index including load characteristics and inertias of generators. Then active-power deficit calculation based on the Low-order Frequency Response Model, concerning the effect of voltage was put forward. Finally, a dynamic correction of the load shedding amount was proposed to modify the scheme. This approach was applied to IEEE-39 system and the simulation results indicated that the proposed method was effective in reducing the load shedding amount as well as the frequency recovery time.

Share and Cite:

Z. Song, J. Liu, Y. Liu, M. Bazargan and W. Liang, "A Method for the Design of UFLS Scheme with Dynamic Correction," Energy and Power Engineering, Vol. 5 No. 4B, 2013, pp. 442-447. doi: 10.4236/epe.2013.54B085.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Y. S. Xue, X. C. Ren, Q. H. Wu, et al, A Review on Optimization and Coordination of Under Frequency/voltage Load Shedding,” Automation of Electric Power Systems, Vol. 33, No. 9, 2009, pp. 100-107.
[2] V. V. Terzija and J. Koglin, “Adaptive Underfrequency Load Shedding Integrated with A Frequency Estimation Numerical Algorithm,” IEEE Proceedings: Generation, Transmission and Distribution, Vol. 149, No. 6, 2002, pp. 713-718.
[3] W. B. Hou, T. Q. Liu and X. Y. Li, “Under-Frequency Load Shedding Based on Comprehensive Weight and Wide Area Measurement System,” Power System Protection and Control, Vol. 39, No. 21, 2011, pp. 70-75.
[4] H. Kottickd, “Optimization of Load Shedding System,” IEEE Trans Energy Convers, Vol. 8, No. 6, 1993, pp. 593-598.
[5] P. M. Anderson and Mirheydarm, “An Adaptive Method for Setting under Frequency Load Shedding Relays,” IEEE Transactions on Power Systems, Vol. 5, 1992, pp. 647-655.
[6] SEETHALEKSHMIK, SINGHSN, SRIVASTAVASC. WAMS Assisted Frequency and Voltage Stability Based Adaptive Load Shedding Scheme, Power&Energy Society General Meeting Calgary, A, B, 2009, Vol. 1, pp. 1-8.
[7] H. Zhou, Q. Li and T. Lin, “Power System Disturbance and Operation Identification Based on WAMS,” Electric Power Automation Equipment, Vol. 31, No. 2, 2011, pp. 7-11.
[8] M. S. Pasand and R. Mihalic, ”New Centralized Adaptive under Frequency Load Shedding Algorithms,” in Proc. Conf. Power Engineering, 2007 Large Engineering Systems, Oct.10-12. 2007, pp. 44-48.
[9] U. Rudez and R. Mihalic, “Monitoring the First Frequency Derivative to Improve Adaptive Under frequency Load-Shedding Schemes,” IEEE Transactions on Power Systems, 2011, Vol. 26, No. 2, pp. 839-846. doi:10.1109/TPWRS.2010.2059715

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.