Contingency Combination Analysis: An Introduction

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Contingency combination analysis is what industry planning and operating criteria often refer to the n-1-1 rule, which holds that a system must operate in a stable and secure manner following any single transmission or generation outage plus another contingency after the first set of n-1 contingency was applied. Previously, this analysis was already possible in Simulator, but required the upfront creation of a list containing all contingencies in a combinatorial fashion, which was memory intensive.

The new tool maintains an additional list of Primary Contingencies, and each N-1-1 contingency is internally managed by combining one primary contingency and one item from the normal contingency list. The normal contingency list will be referred to as the Secondary Contingency List during this analysis. This significantly reduces memory requirements.

Improvements have also been made to the user interface for user friendly viewing, filtering, or saving results produced by Contingency Combination Analysis.

 

Contingency Combination Analysis is accessed and controlled through the Contingency Combination Analysis dialog.