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Load shedding scheme based on rate of change of frequency and ranked stability index for islanded distribution system connected to mini hydro
Author(s) -
Sapari Norazliani Md.,
Mokhlis Hazlie,
Abu Bakar Ab H.,
Mohamad Hasmaini,
Laghari Javed A.,
Dahalan Mohd R. M.
Publication year - 2017
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22384
Subject(s) - load shedding , control theory (sociology) , voltage , electric power system , stability (learning theory) , generator (circuit theory) , scheme (mathematics) , limit (mathematics) , index (typography) , power (physics) , computer science , engineering , reliability engineering , mathematics , electrical engineering , control (management) , mathematical analysis , physics , quantum mechanics , artificial intelligence , machine learning , world wide web
This paper presents a load shedding scheme for a distribution network connected to mini hydro generations. The proposed scheme uses the rate of change of frequency ( ROCOF ) to estimate the power imbalance and voltage stability ( VS ) to prioritize the load that is to be shed. The load with the most critical voltage stability (which is based on a special index) is given the first priority to be disconnected from the network in order to avoid voltage collapse. By performing load shedding based on the combination of the ROCOF and VS techniques, a better system frequency and enhanced voltage magnitudes can be achieved. The performance of the proposed scheme is validated on existing Malaysian network interconnected with a mini hydro generator. Simulation results show that the proposed scheme not only successfully stabilizes system frequency, but also simultaneously stabilizes the voltage magnitude of the buses within an acceptable limit. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.