A multi-index evaluation method of voltage sag based on the comprehensive weight

Aimed at evaluating the severity of voltage sags in the distribution network more accurately and reasonably, a multi-index evaluation method based on comprehensive weight is proposed. Compared with the traditional methods, this method selects multiple evaluation indexes both from power supply side and electricity side to form a collection of evaluation indicators, making evaluation results more comprehensive. It employs analytic hierarchy process (AHP) and the CRITIC method to calculate a comprehensive weight, which can reflect the deep inner relation between each evaluation index, as well as their relative importance. After multiple Monte Carlo simulation, the composite score of each node is calculated, and the vulnerability area intersection of weak nodes in the network is obtained. Finally the results of an example prove that this method can accurately and effectively identify weak nodes and fragile area in network, which lays the foundation for voltage sag control.