A New Method for Analyzing the Voltage Stability to Assess the Power Load Buses in Power Systems

Abstract

This paper proposes a new algorithm with a new formula for assessing and ranking the power load buses concerning the voltage stability involved in the short-circuit faults occurring in multi-machine power system operations. The new mathematical formula, determined by the values of transient voltage stability estimation (TVSE), allows estimating the transient state and assessing the transient structures of the power systems concerning the transient voltage stability. The oscillations of the generator’s angular velocities, varying in time and causing the power network’s non-linearity in transient configurations of the power system under the condition of the single-shot automatic line reclosing, are mathematically simulated. The transient parameters, such as the synchronous, asynchronous, damping torques, angles of transient electromotive forces, are simulated under the impact of automatic voltage and frequency regulation. The transient voltage stability estimation values are determined to assess the transient structures influenced by the continuous disturbance of angular velocities of the generators operating in the multi-machine power system. The typical examples and results prove the advantages of the new algorithm features for analyzing the multiple contingencies with the ALR in multi-machine power systems.