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A new formulation for power system reliability assessment with AC constraints

Safdarian, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijepes.2013.11.027
  3. Abstract:
  4. Recent investigations have revealed the significant role of reactive power in blackout events. The associated disturbances frequently emerge in the form of voltage instability and collapse. Due to the computational complexity of modeling and analysis of enormous contingencies, DC approximation of the power flow, without accounting the role of reactive power, is usually used to evaluate the contingencies and to mitigate the associated probable violations. This paper, at first, presents a linear power flow model based on an approximated version of AC power flow formulation. The proposed model is then used to develop an efficient reliability assessment approach which is capable of taking both active and reactive powers into account. The analysis technique is based on the linear programming format which leads to an optimal solution within a short computation time. Voltage and reactive power violations as well as transmission system overloads are alleviated by generation rescheduling or load shedding as the last resort. Numerical tests on the IEEE-RTS and the Iranian power grid show the acceptable accuracy of the results along with a significant reduction in the computational effort. Various sensitivity analyses are also investigated to reveal the robustness and performance of the proposed model
  5. Keywords:
  6. Composite system reliability ; Contingency analysis ; Linear power flow model ; Reactive power ; Active and reactive power ; Computational effort ; Generation rescheduling ; Power flow model ; Power system reliability ; Reliability assessments ; Reliability analysis
  7. Source: International Journal of Electrical Power and Energy Systems ; Vol. 56, issue , March , 2014 , p. 298-306 ; ISSN: 1420615
  8. URL: http://www.sciencedirect.com/science/article/pii/S0142061513004857