Identification of Coherent Groups of Generators Based on Fuzzy Algorithm

This paper presents a new proposed technique to identify the coherent groups of generators using fuzzy c-means clustering algorithm (FCM). The proposed technique is based on a proposed coherency criterion introduced by using time response of the linearized power system model that reveal the relations between generators which is the integral of the square of the rotor angle difference (ISEδ) which introduce to FCM as initial membership matrix. A new technique of constructing the dynamic equivalent of power system is also presented. The proposed technique is applied on 30-Bus IEEE system and the effect of loading conditions on the coherent generators is studied. The obtained results proved that the proposed technique is highly effective in determining the coherent groups of generators and in constructing the dynamic equivalent of power system with high accuracy. Index Terms Coherent generators, Fuzzy C-Means Clustering Algorithm, Dynamic aggregation.