Determining a secure region of operation for Idaho Power Company

This paper deals with quick security calculations that provide a quantitative impact of every contingency on system conditions in Idaho Power Co. while simulating two simultaneous power transfers. The secure region of power system operation is determined and plotted for each contingency. Contingencies are ranked based on the size of the secure operating region, and the most limiting contingencies are identified. Optimal mitigation measures that increase the size of the secure operating region are then determined for each contingency. The effect of remedial actions on the size of the secure operating region is analyzed. The study was performed using full AC analysis methodology for contingency screening and transfer studies. AC limits for transfer scenarios are computed based on thermal, voltage and voltage stability constraints.