Comprehensive evaluation of power quality based on the model of projection pursuit

To overcome the deviation caused by the effect of subjective factors in power quality evaluation, and make the evaluation more accurate and objective, on the basis of power quality comprehensive evaluation criterion, the projection data are built with projection pursuit method. Two hundred power quality comprehensive evaluation samples are randomly generated within the range of each class. The projection pursuit model is built by unitary processing according to these samples, which converts the evaluation into non-linear multi-constrained optimization problems. The optimal projection direction vector and the weight coefficient of each evaluation index are obtain with composite simplex method. Meanwhile the corresponding relationship between region of variation of projection eigenvalue and classification grade is established. The precision of sample evaluation reached 100% and the evaluation of the measured data achieved good effect. Thus, the scientific evaluation of power quality is realized by the projection pursuit model.