Risk of Transient Stability Using Rotor Trajectory Index as Severity Function

Elmotaz Billa Elghali (Electrical Power Department, University Tenaga National)
Marayati Marsadek (College of Engineering, Electrical Power Department, University Tenaga National)
Agileswari K. Ramasamy (Electrical Power Department, University Tenaga National)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 6, No 3: June 2017

This paper presents a new approach to determine the risk of transient stability. It describes the implementation of rotor trajectory index (RTI) to assess the severity of power systems when it is subjected to a three-phase fault. The (RTI) is proposed as an index used to represent severity of transient instability. Risk of transient stability for three-phase fault is calculated using a well-known risk formula. Risk of transient stability provides a quantitative measure to evaluate the potential loss of synchronism of a generator that takes into account the probability and consequences. RTI index is calculated based on the machines rotor angles obtained at each step of a time domain simulation. RTI is proposed as an index to show the severity of the three-phase fault towards transient stability since it allows a fast and accurate measurement of the degree of stability of the system facing a fault. The proposed technique is implemented on the IEEE 39-bus system.