Ranking Power System Contingencies for Real-Time Assessment of Voltage Stability based on PMU Data

Document Type : Original Article


1 faculty of power electrical,Shahid beheshti University,Tehran,Iran

2 Department of Electrical Engineering, Shahid Beheshti University, Tehran, Iran

3 faculty of power electrical engineering,Shahid beheshti University,Tehran,Iran

4 faculty of power electrical engineering ,shahid beheshti university,Tehran,Iran



Voltage stability has been one of the main problems of power systems in recent years, and the ranking of contingencies is one of the practical factors in assessing voltage stability. Therefore, the importance of maintaining grid stability necessitates the real-time assessment of voltage stability to protect the system from the risk of instability, and contingency Ranking provides a list of essential and critical contingencies in terms of their impact on the network for real-time use. In this paper, a new index for the classification of contingencies is presented, which is defined based on the voltage deviation and phase angle of the buses and PMU data. The proposed index has been tested on the IEEE 30-bus network. First, using this index, a contingency study was performed in 1000 working points, and the results of these studies were compared with a random working point. Comparing the results obtained from the proposed index with other available indices shows its proper performance for ranking and screening of possible contingencies in power systems.


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 24 August 2021
  • Receive Date: 30 January 2021
  • Revise Date: 16 June 2021
  • Accept Date: 26 July 2021