Robust stabilization of load frequency control sys

Authors: Ashraf Khalil JiHong Wang Omar Mohamed

Publish Date: 2016/12/29

Volume: 14, Issue: 1, Pages: 93-105

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Abstract

The deregulation of the electricity market made the open communication infrastructure an exigent need for future power system In this scenario dedicated communication links are replaced by shared networks These shared networks are characterized by random time delay and data loss The random time delay and data loss may lead to system instability if they are not considered during the controller design stage Load frequency control systems used to rely on dedicated communication links To meet future power system challenges these dedicated networks are replaced by open communication links which makes the system stochastic In this paper the stochastic stabilization of load frequency control system under networked environment is investigated The shared network is represented by three states which are governed by Markov chains A controller synthesis method based on the stochastic stability criteria is presented in the paper A onearea load frequency control system is chosen as case study The effectiveness of the proposed method for the controller synthesis is tested through simulation The derived proportion integration PI controller proves to be optimum where it is a compromise between compensating the random time delay effects and degrading the system dynamic performance The range of the PI controller gains that guarantee the stochastic stability is determined Also the range of the PI controller gains that achieve the robust stochastic stability is determined where the decay rate is used to measure the robustness of the systemAshraf Khalil received the B Sc and M Sc degrees in electrical engineering from the University of Benghazi Libya in 2000 and 2004 respectively and the PhD degree in electrical engineering from University of Birmingham UK in 2012 In 2012 he was a lecturer at University of Benghazi Libya he is assistant professor since 2014 Currently he is the head of the Electrical and Electronic Engineering Department at University of Benghazi Libya He published more than 30 refereed journal and conference papers He participated in curriculum preparation and assisted in establishing and developing a number of universities and high institutes in Libya In 2012 he participated in preparing and revising curriculum for the Benghazi College of Electrical and Electronics Engineering Technology In 2014 he assisted in establishing Benghazi University of Technology He is a member of IEEEJiHongWang received the BEng degree from Wuhan University of Technology China in 1982 the M Sc degree from Shandong University of Science and Technology China in 1985 and the PhD degree from Coventry University UK in 1995 In 2011 she joined the School of Engineering at the University of Warwick UK Her previous post was in the School of Electronic Electrical and Computer Engineering at the University of Birmingham where she was professor of control and electrical power and deputy director of the Midlands Energy Graduate School She has also served as lecturer and senior lecturer at the University of Liverpool from 1998 to 2007 Currently she is professor at the School of Engineering University of Warwick UK She has published over 100 technical papers and gained two best paper awards Her research has led to several practical innovations She is a technical editor of the IEEE Transactions on Mechatronics and is associate editor of two other international journalsOmar Mohamed received the B Sc and M Sc degrees in electrical engineering from the University of Benghazi Libya in 2005 and 2008 respectively and the PhD degree in electrical engineering from University of Birmingham UK in 2012 In 2012 he was a lecturer at University of Benghazi Libya Currently he is assistant professor at Princess Sumaya University of Technology PSUT Electrical Engineering Department Amman Jordan He has published more than 15 refereed journal and conference papers He is a member of IEEE

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