System level results

Abstract

In this Chapter, the combination of the substation model and power system simulations is described. The Chapter discusses the results of the event tree analysis; the chains of events, minimal cut sets, contributing factors, importance measures, and sensitivity analyses are presented. Furthermore, based on these results, some recommendations are made. The Chapter also includes a description of indices to characterize the system breakdown. A power system state as a common measure enables importance measures in such a way that different components can be ranked. The frequency of the power system states can be estimated; but more important than this, are the minimal cut sets and chains of events that may lead to a system breakdown or other power system states. Different importance measures, Fussell-Vesely, risk achievement worth (also called risk increase factor), risk reduction worth (also called risk decrease factor), are presented. © Springer-Verlag London Limited 2011.