THE ASSESSMENT OF LOCAL VOLTAGE STABILITY USING BUS IMPEDANCE AND P-Q CURVE IDEA

摘要

In this paper the original method for the steady state study of local voltage stability is presented. It is very important to find the minimal distance to voltage collapse at load bus. Practically, the idea of P-V and Q-V curves is used to determine the maximal reactive margin at load buses to avoid voltage collapse. In the paper, the idea of bus P-Q curve is proposed for the assessment of such a reactive margin. The P-Q curve is created on the basis of bus impedance. Mathematical background of the P-Q curve method is described and a simple example is presented in this paper.