Voltage Stability Risk Analysis

This paper focuses on the important aspect of estimating and quantifying the voltage stability risk with and without VAR support It is motivated by the perception that VAR support guarantees additional security and is economically justifiable. A decision tree based model is designed for estimating the risk, which accounts for both future system uncertainties and consequences associated with violation of limits and voltage collapse. A case study on the standard IEEE 24 bus reliability test system investigates the different scenarios and evaluates the risk. The results prove that in spite of high installation costs, an SVC can make the system more reliable and ensure cost savings.