Demonstration of RATC Algorithm for Emergency Crisis and its Stability Validation

1. Overflows Due to Unexpected Load Changes Steady State Assessment Demonstration of RATC Algorithm for Emergency Crisis and its Stability Validation Top Area • In the 9 bus system, under unexpected generation loss in one area and thus shift of generation to other areas, overflows occur on the tie lines among left and right areas. • The load at bus Right2 must be shed by 11.5% to reduce the tie line flows to their limit (100%). Right Area • The steady state solutions match the DC flows closely. Overflows Trigger RATC Algorithm Left Area Dynamic response check Performance and benefits • Synchronism check : • Voltage check : • Tie line real power losses is divided evenly into areas. • Real power loss is reduced for all the three areas. • Stability margin is more than doubled. The critical clearing time for a solid three phase fault at bus Right 3 is increased from 0.2 seconds to more than 0.5 seconds. • Demonstrates RATC as a corrective control action. • Results show that switching lines can relieve overflows, improve stability margin, reduce loop flow/wheeling effects, and reduce system loss. • A line switching solution is found by RATC that opens the tie line between right area and upper area. • The overflow is relieved and no load shedding is involved. • The system is back into normal state from emergency state with N-1 criterion satisfied. • System settles down nicely after line switching.