Comparing Load Flow Decomposition Methods for Cost Sharing of Coordinated European Redispatch

Abstract

Transition from bilateral and expert-based to optimized and cost-efficient redispatch demands establishing a clear methodology for sharing costs of globally coordinated remedial actions. One way to approach the cost sharing issue is to relate the cost of redispatch to flow categories. Proceeding according to this idea, demands performing a decomposition of physical power flows over critical branches into components and categorizing them. In operational practice different flow categories are of unequal priority, e.g. unscheduled flows are to be penalized before commercial exchange. This observation prompts us to examine the differences between selected methods for decomposition. In order to perform a meaningful comparison we describe decomposition algorithms, compare numerical results based on a test case of power system and discuss both observed differences and design features which lead to numerical discrepancies.