Analysing System Loadability with Multiple VSCs Using a Hybrid Model

This chapter introduces an analysis framework based on a hybrid model for assessing system loadability. The framework significantly reduces the dimensionality of the system model required for assessments while still capturing all essential dynamics. Critical dynamics leading to instability are identified using eigenvalue sensitivity measures combined with participation factor analysis. The effectiveness of this method is demonstrated on a small test network, where it is shown to accurately capture essential dynamics and thereby identify instabilities along the loadability trajectory. Following its demonstration on a small test network, the framework is extensively tested on a large IEEE-39 bus network. Here, various system instabilities are accurately identified using the analysis framework, but with a reduced computational burden.