DETERMINATION OF CONGESTION ZONES IN DEREGULATED ELECTRICITY MARKETS USING FUZZY CLUSTERING

Congestion management is an important task for dealing with congested transmission line flow in deregulated electricity markets. This paper presents a new method for determining congestion zones. The method uses the fuzzy-c-means (FCM) algorithm and a partition separation index (PSI). The nodal prices or the locational marginal prices (LMP) serve as inputs to the FCM for a given cluster (zone) number while the PSI is used to determine an appropriate zone number. The IEEE 30- and 118-bus systems are employed to serve as test systems for showing the applicability of the proposed method.