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Developing a New Approach for Reliability Evaluation of Large Scale Composite Systems

Marfou, Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49211 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotuhi Firuzabad, Mahmud
  7. Abstract:
  8. The main concern of power system planners and operators is to serve electric energy services economically and in an acceptable reliability level. Nowadays, in developing integrated large-scale power networks, reliability evaluation becomes a very tough and time-consuming process. The complexity of this assessment is mainly because of the large number of components, their possible operating states, different faults that can happen, and environmental and other affecting parameters. In power systems, in order to address the complexity, reliability evaluation can be conducted in three different levels. The most complicated study among these three levels is HLII that is so-called composite generation and transmission system or composite system in summary. So far, several methods have been proposed for speeding up composite system reliability evaluation. Some of them have focused on reducing the number of contingencies that should be evaluated by selecting system states wisely, while the others tried to accelerate contingency analysis. In this thesis, a novel method is proposed for reliability evaluation of large-scale power systems. In the proposed method, the whole power system is divided into some sub-networks. Then, the reliability of each sub-network is evaluated using the proposed method. In this method, adjacent sub-networks are modeled on the boundary lines, so there is no need to perform optimization across the entire network. Thus, the number of variables and constraints of the optimization problem and consequently the time of contingency analysis will decrease. Finally, the reliability indice of the whole power system are calculated using the results obtained from reliability evaluation of sub-networks. The proposed method is applied on the IEEE-RTS and IEEE RTS-96 test systems and expected demand not supplied (EDNS) and computation time are calculated. Fortunately, this method does not make any significant changes in the accuracy of the results. In addition, the results obtained from the proposed method are compared with some existing methods to demonstrate superiority of the proposed model
  9. Keywords:
  10. Reliability Analysis ; Contingency ; Large Scale Coposite Systems ; Contingency Analysis ; Subnetwork

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