Research On Simulation Analysis And Comprehensive Evaluation Method Of Composite Power Quality Of Distribution Network

With the rapid improvement of national economy and the rapid development of science and technology,the demand of users for power is increasing day by day,and the demand for power quality is also increasing.This paper mainly studies the simulation and comprehensive evaluation of composite power quality in distribution network.Firstly,this paper establishes the index system of composite power quality in distribution network,introduces the national limits of each power quality event index and the definition of each index,and determines the indicators needed for this evaluation.On this basis,the evaluation index of customer satisfaction is added,and a new composite power quality index evaluation system for distribution network is formed.According to the limits and user’ needs,the evaluation indicators are divided into five levels.Secondly,a comprehensive evaluation method based on combination weighting method and grey relational degree method is proposed.In view of the shortcomings of the traditional entropy weight method and the existing improved entropy weight method,a new improved entropy weight method is proposed.According to the improved entropy weight method and G1 method,the objective weight and subjective weight of the index are calculated respectively.Then,the combination weighting method based on variance maximization is used to weigh the two weights,and the comprehensive weights of each evaluation index are obtained.Finally,the grey relational degree method is used to evaluate the power quality of each sample.Finally,taking the standard node system of IEEE 33 as an example,the simulation model of composite power quality events in distribution network is established,and the data obtained from the simulation are analyzed and processed to obtain the evaluation index data of the system.Finally,the power quality of the system is evaluated by the comprehensive evaluation method proposed in this paper.The validity of the simulation model and the feasibility of the power quality comprehensive evaluation method in this paper are verified.