Assessing the Transient Stability under the Impact of Double Shot ALR to Rank the Power Buses in Multi-Machine Power Systems

Abstract

This paper proposes a new mathematical formula to calculate the Transient Energy Margin (TEM) under the condition of double shot Automatic Line Reclosing (ALR) within the frame of the center of inertia of the multi-machine power system. With the proposed formula, a new algorithm is built to assess the transient stability to rank the power buses in a multi-machine power system, serving the power system expansion planning. The regulations of the AFR and AVR systems affecting the electromechanical transient processes are simulated to calculate the transient energy margin values for the cases of symmetrical/asymmetrical faults occurring in the test power system. The typical examples and results are shown to prove the advantage of the new proposed formula of transient energy margin.