Online Dynamic Security Assessment

Abstract

This chapter describes an implementation of an online dynamic security assessment system based on time-domain simulation, in which dynamic models are the same as those used offline for planning studies with all necessary details. It contains a review of the adopted methods and algorithms (power flow, continuation power flow, time-domain simulation, energy functions, single machine equivalent, and Prony spectral decomposition) focusing on the main issues related to their numerical and computational performance. The utilization of these methods to execute complex security tasks such as dynamic contingency analysis and security region computations is described. Aspects of high-performance computation (fineand coarse-grain parallelization) are discussed. Some practical results obtained online and comparisons of online with offline planning cases are shown.