An efficient method for contingency ranking using voltage stability index in power system

Abstract

The power system is a complex network consisting of enormous equipment. Failure of any one of this equipment during its operation affects the reliability of the system and it also leads outage of equipment. The impact of outage states on the system reliability is taken into consideration in contingency selection and ranking method. The objective of contingency enumeration is to identify the contingencies which may lead to unreliability. In this paper, a computationally feasible approach to rank severe contingencies using New Voltage Stability Index (NVSI) is proposed. Illustrations using IEEE 30 and practical TNEB 69 bus system in India aim to exhibit the effectiveness of proposed method for considering different heavy loading condition with one outage (line/generator).