Voltage Stability Assessment Using LVSI Under (N-m) Contingency

Abstract

Voltage instability is an incident that can occur in a power system due to a stress condition. The occurrence of voltage instability will lead to a total blackout of the whole power system. Thus, an assessment of voltage instability due to the stress condition or other disturbances needs to be carried out. Disturbances can be in the form of line outage or generator outage. The assessment is to identify the line that has the highest effects on voltage stability when there is an outage occurrence. The highest rank of contingency shows that the line of the system contributes to system instability. This paper presents the assessment of voltage stability using line voltage stability index (LVSI) under (N-m) contingency. In this case, N is the total components in a system, while m is the total components undergoing outages either line or generator. This is to trace the state of the voltage stability condition and the values of the line indices are ranked to emulate the contingency. The proposed contingency ranking technique was tested on the IEEE 30-Bus Reliability Test System (RTS).