LOCAL OPTIMAL COORDINATION BASED ADAPTIVE COORDINATION

ABSTRACT

This paper presents the development of an adaptive coordination scheme for the coordination of directional overcurrent relays for large interconnected power systems, using the concept of local optimal coordination under the changed system conditions. In response to a structural change or an operational change in the power system, the developed adaptive local optimal coordination algorithm automatically identifies the local disturbed region and re-coordinates only the settings of the relays which fall inside this identified local region in an on-line manner. The scheme developed is applied to the IEEE 57-bus test power transmission system. The results are validated through a full system coordination study and the usefulness of the reported algorithm is demonstrated.