Research on Calculation of Branching Coefficient in High-voltage Ring Network Based on Loop Method

Abstract

Nowadays, High Voltage level power grid becomes more and more complicated in china. Ring network as a common grid structure makes it difficult for protection to cooperate. In order to configure protection parameter, the status of power grid must be considered. Branching coefficient which is an important value for protection configuration is related to status of power grid in different situation. The critical status of power grid bring critical branching coefficient, searching for critical operating mode of power grid is important in setting protection configuration parameter. Base on the characteristic of High Voltage Ring network, a loop method is proposed in this paper to calculate the most critical branching coefficient. By searching for ring network of different degree, all branching coefficients of different grid situation are calculated. The comparison of Loop Method and traditional method manifests the effectiveness of the method this paper proposed.