A power quality comprehensive evaluation method based on grey clustering

Aiming at the continuity problem of comprehensive evaluation of power quality,based on the national standard limits of power quality indices,this paper normalizes the power quality indices and combines the combination weighting method with the grey clustering method to comprehensively evaluate power quality.First of all,the weights of all indices are obtained by analytic hierarchy process(AHP);then,if one or more indices of the evaluating object are over standard,the whitenization values of the indices in every grey class are obtained according to their severities or the normalized value;lastly,the power quality is comprehensively evaluated by grey clustering method,and the power quality level and the power quality score are obtained.Case result shows that the proposed method solves the evaluation continuity problem of the indices' ranging from one side to the other side of the boundary,providing a new idea for comprehensive evaluation of power quality.