Contingency Analysis of IEEE 9 Bus System

Contingency analysis is important for power system security assessment & market operations. In this paper, initially IEEE 9 bus system with conventional synchronous generator is taken for study and contingency analysis is done by disconnecting transformer, transmission line and generator, one at a time and voltages performance indices are found out. Same procedure is repeated for IEEE 9 bus system replacing one conventional generator with DFIG based wind farm of same rating. Comparison is done between these two cases and results are presented. Simulation is done using Digsilent power factory and the voltage performance index is used to identify and rank the severity of outages. Results show that severity still persists even with DFIG, but if DFIG is optimally placed, the system shows better performance in case of contingency, because of its reduction in inertia, increase in synchronizing torque and its placement close to load.