Identification of Critical Branch in Weakness Section Based on Disturbed Tie-Line Electrical Characteristic

Fast automatic recognition helps to find out vulnerable branch in weakness section. Taking timely control strategies after recognition is good for maintaining power system stability. At first, sending and receiving system is used to prove the phenomenon that two peaks appear in active power trajectory when it is disturbed to stability margin. Secondly, fast identification method is put forward to find out critical branch. In order to facilitate its online usage, judge formula and flow chart is given to help to make the decision. Finally, computing example of New England system is used to prove theory above and to verify control effect.