DefinePK

Abstract

Recent trends reveals that in order to operate the modern transmission and distribution power system networks with maximum reliability and security, a power system operator must have the knowledge of the voltage stability margin. It has become a challenging task to accomplish fast and accurate indications of voltage stability margin in power systems. In this paper a new voltage stability indicator has been proposed considering the Line charging susceptance based on unique equivalent Two - Bus p network system applying the fundamental Kirchoff - Laws. With the help of this proposed indicator, an operator can efficiently and quickly detect the proximity of a voltage collapse for a multi-bus system. This voltage stability indicator is defined as Transmission Line Voltage Stability Indicator (TLVSI) for online monitoring of a system. The proposed indicator has been incorporated on the IEEE 5-bus and IEEE.14-bus system considering the several power system topology and many contingency scenarios. This voltage stability indicator can also be used to find the effect of change of active load on the system and its relation with the receiving end voltage and the transmission line critical voltage to detect the most vulnerable spots of the system.