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Robust stabilization of load frequency control system under networked environment

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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 one-area 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 system.

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Author information

Authors and Affiliations

  1. Electrical and Electronics Engineering Department, University of Benghazi, Benghazi, Libya

    Ashraf Khalil

  2. School of Engineering, University of Warwick, Coventry, UK

    Ji-Hong Wang

  3. King Abdullah II Faculty of Engineering, Princess Sumaya University of Technology, Amman, Jordan

    Omar Mohamed

Authors
  1. Ashraf Khalil
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  2. Ji-Hong Wang
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  3. Omar Mohamed
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Corresponding author

Correspondence to Ashraf Khalil.

Additional information

Recommended by Guest Editor Dongbing Gu

Ashraf 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 Ph.D. 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 IEEE.

His research interests include networked control systems, renewable energy, smart-grids and the impacts of the time delay on power system stability.

ORCID iD: 0000-0001-5668-9781

Ji-HongWang received the B.Eng. 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 Ph.D. 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 journals.

Her research interests include power system modelling, control and monitoring, including large scale power plant modelling and control, energy efficient actuators and systems, nonlinear system control theory with industrial applications.

ORCID iD: 0000-0003-1653-6259

Omar 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 Ph.D. 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.

His research interests include power system analysis, modelling, identification, planning, and control.

ORCID iD: 0000-0003-0618-2012

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Khalil, A., Wang, JH. & Mohamed, O. Robust stabilization of load frequency control system under networked environment. Int. J. Autom. Comput. 14, 93–105 (2017). https://doi.org/10.1007/s11633-016-1041-z

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  • DOI: https://doi.org/10.1007/s11633-016-1041-z

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