Prompt identification of weak transmission lines regarding voltage collapse

In this paper, a practical and simple approach for finding the weakest power transmission line in a power system is proposed to be used. This is the P-Q curve idea. One can create the P-Q curve for each transmission line. The minimal distance from the steady state point to the P-Q boundary curve may be treated as the degree of the voltage security at a given transmission line. Additionally, using the P-Q curves, one can calculate the probability of branch voltage collapse for uniformly distributed active and reactive powers.