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Optimal Transmission Switching as a Remedial Action to Enhance Power System Reliability

Tabatabaei Khorram, Abbas | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47289 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Abbaspour Tehrani Fard, Ali; Fotuhi Firouzabad, Mahmud
  7. Abstract:
  8. Mainly due to the catastrophic effects of electricity service interruptions and their huge damage costs, transmission networks are always designed as meshed networks wherein load points can be served through alternative redundant paths. This redundancy, although it has positive impacts on reliability in general, may worsen the situation during some contingencies. The number of operating constraints imposed by Kirchhoff’s current and voltage laws increases as the number of branches in transmission networks grows. This increment in the number of constraints may force operators to commit costly generation units in normal operation of the network as well as to invoke more unexpected load shedding when service reliability is jeopardized. This in turn can be translated to higher operation costs and lower service reliability. Accordingly, the idea of using transmission network switching actions as a tool to enhance power system performance has been recently proposed by power system experts and researchers. Northeast Power coordinating Council (NPCC) indicates that TNS can be used as a remedial action to maintain system reliability in abnormal condition, also USA Energy Policy Act of 2005, Sec.1223.a.5 mentioned that TNS mean a technology that increases reliability of existing or new transmission system. Although intentional manoeuvres in transmission networks have been proven to be effective in reducing operation costs as well as in congestion management, its potential impacts on composite system reliability has not been yet studied. Accordingly, this paper endeavors to assess impacts of manual opening of transmission lines and reconfiguration in substations on major attributes of composite system reliability. For doing so, the existing contingency analysis models are extended to consider network switching actions among the set of remedial actions. The extended model is formulated as a mixed integer linear program (MILP) which can be easily solved via commercially available solvers. The model aims at minimizing total damage cost caused by inevitable load shedding following contingencies. In the optimization problem, the output power of generators, load shedding at load points, and binary variables indicating open/close status of switches are the set of decision variables. Numerical studies on modified reliability test system (MRTS) reveal that the switching actions, by avoiding/reducing mandatory load curtailments, can reduce damage cost as well as enhance composite system reliability. The conclusions drawn from the studies can be a guide for power system operators who would like to apply intentional maneuvers in transmission level
  9. Keywords:
  10. Reliability ; Composite System ; Transmission Switching ; Substation Reconfiguration

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