A method of power quality evaluation based on vague sets

In this paper, we regard the power quality evaluation method as research content. We construct the identity understanding matrix and difference understanding matrix by using the judgment matrix of analytic hierarchy process and the connection degree model of set pair analysis. Then calculate the weight of power quality indexes by utilizing the compatibility matrix method and entropy weight method in order to reduce the subjectivity of evaluation. Based on this weight, we propose a power evaluation method based on vague sets that can sort the power quality of monitoring point. Finally, we applied this method to power quality evaluation among actual wind farms in China and proved that the method is effective and feasible.