Comprehensive evaluation of power quality of coal mine power grid based on equilibrium empowerment and improved grey relational projection method

Abstract

Aiming at the problem that the current comprehensive evaluation system of power quality is not fully applicable to coal mine power grid, and the load characteristics of coal mine electrical equipment are less considered, a comprehensive evaluation method of power quality of coal mine power grid based on equilibrium empowerment and improved grey relational projection is proposed. According to the actual situation and load characteristics of coal mine power grid, the power quality index system of coal mine power grid is established, and the grade is divided according to the national standard. The G-1 method is used to determine the subjective weight of the index, the improved CRITIC method is used to determine the objective weight of the index, and the subjective and objective weights are combined with the equilibrium idea of game theory to determine the equilibrium weight, so as to overcome the limitation of single weight. The TOPSIS method is combined with the GRA method, and the positive and negative ideal sequence is introduced to make up for the deficiency of the traditional GRA method. The vector projection method is used to construct the grey relational projection model, and the projection value is used to comprehensively evaluate the power quality of coal mine power grid. The example analysis shows that the proposed method is effective and feasible, can correctly evaluate the power quality of each test point, and can reasonably divide the power quality grade of each test point, which provides a basis for power quality management.