An Improved UFLS Scheme based on Estimated Minimum Frequency and Power Deficit

Hassan Haes Alhelou, M. E. H. Golshan, R. Zamani, M. P. Moghaddam, Takawira C. Njenda, Pierluigi Siano, Mousa Marzband

Research output: Contribution to conferencePaperpeer-review

16 Citations (Scopus)
73 Downloads (Pure)


In the event of a power system disturbance, it is important that the decision to implement under frequency load shedding is based on both the minimum frequency and the magnitude of the disturbance. In this paper, we propose the use of higher order polynomial curve fitting to estimate the minimum frequency. If the prediction shows that the minimum frequency threshold will be violated, the magnitude of the total disturbance is estimated using the swing equation. In addition, the minimum amount of load that must be shed to restore the frequency just above the minimum value can also be directly calculated. Simulations are carried out for the considered Taiwan power system and the results prove the efficiency of the proposed technique.
Original languageEnglish
Number of pages6
Publication statusPublished - 26 Aug 2019
Event2019 IEEE Milan PowerTech - Milan, Italy
Duration: 23 Jun 201927 Jun 2019


Conference2019 IEEE Milan PowerTech


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