Available Transfer Capability Calculations with Contingencies for Andhra Pradesh State Grid

Contingency analysis and risk management are important tasks for the safe operation of electrical energy network. Potential harmful disturbances that occur during the steady state operation of a power system are known as contingencies. Contingency analysis is carried out by using repeated load flow solutions for each of a list of potential component failures. In this paper is work is carried out by selecting the contingencies according to the line loading for single transmission line outage and identified the severe most contingency based on transmission line loading. This process has to be executed for all the possible contingencies for tie lines and limiting lines, and repeated every time when the structure changes significantly and Available Transfer Capability (ATC) is calculated between the areas for each contingency. The results are analyzed and discussed on 124-bus real life Indian utility system of Andhra Pradesh State Grid.