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Reliability Assessment of DSSC devices and Optimal Placement of them with the aim of Enhancing Power System Loadability and Reliability

Dorostkar Ghamsari, Mohammad Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40202 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotuhi-Firuzabad, Mahmoud
  7. Abstract:
  8. One of the important problems in fulfilling the consumers' power demand that has been especially intensified after restructuring is transmission line congestion. To solve this problem, either new transmission lines should be constructed or the existing transmission lines should be better utilized. Construction of new transmission lines is both expensive and time consuming. Therefore, it is usually better to enhance the utilization of the existing transmission assets. FACTS devices have been introduced over the past decades to enhance power systems operation. However, wide scale deployment of them has not occurred yet due to their high initial investment cost and some other problems. In order to remove these barriers, the concept of distributed FACTS (D-FACTS) was proposed recently. D-FACTS are low power rated devices and can be manufactured with commercially available electronic components. Consequently, they have the potential of low cost production. Therefore, it is expected that they will be widely used in the transmission networks. Distributed Static Series Compensator (DSSC) is a new type of D-FACTS devices that has been recently introduced to realize active control of power flow. Comprehensive studies should be performed on DSSCs to examine their impacts on power systems operation. In this research, a comprehensive reliability model is presented for the DSSC, and then, the impact of DSSCs on power systems reliability is evaluated. Moreover, optimal DSSCs placement with the aim of improving the system loadability and reliability is conducted. To make the optimization problem linear, an approximate mathematical model for the DSSC is presented and its accuracy is examined. The optimization problem is solved using the mixed integer linear programming (MILP) method. The optimization problem cannot have more than one objective and it is necessary to compromise between improving the system loadability and reliability. To do this, the Pareto method is used and a new algorithm is presented to calculate the Pareto-points. In all studies, constraints of DC load flow model are taken into account. The IEEE reliability test system (RTS) is modified, and different case studies as well as a wide range of sensitivity analyses are conducted on it to both examine the effectiveness of the proposed formulations and the impact of some important factors
  9. Keywords:
  10. Power System Reliability ; Optimal Placement ; Distributed Static Series Compensator (DSSC) ; Reliability System ; Reliability Model

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