One of the most important requirements for effective performance of a power system network is to make the network secure against unanticipated outages. It is very important to be able to predict the extent of violations that can occur in the network in the event of unprecedented contingencies. Contingency Analysis is useful both in the network design stages and for programmed maintenance or network expansion works to detect network weaknesses. The weaknesses can be strengthened by transmission capacity increase, and shunt compensations at the buses. This work considers the simulation of single generators and transmission line outages so as to carry out a full AC load flow based contingency analysis on the Nigeria 330kv post-reform grid. The simulation results show severe bus violations with generator contingencies at Mambilla and line contingencies at Jos-Gombe and Damaturu-Mambilla lines. Under the same contingencies for the fortified grid, there were no violations on the network, indicating that the simulated fortification can be recommended for real time performance of the network.
Keywords: Contingency, Post-reform grid, Simulation, Violations, fortified grid
