Study And Application On Power Quality Comprehensive Evaluation Method

The power quality level of power system is affected by many factors.The single independent power quality index can not reflect the overall level of power quality systematically and comprehensively.In this paper,the evaluation index,evaluation method and its application in the actual power grid of power quality comprehensive evaluation are studied in depth.A combined evaluation model of power quality combining similarity and difference characteristics is proposed,and the method is applied to the comprehensive evaluation of power quality of actual monitoring points.On the premise of in-depth understanding of the background and current status of the subject,this article establishes a comprehensive evaluation index system of power quality in combination with the construction principle of the index system,and makes a detailed analysis of each index with reference to the current national standards.Then,use AHP,entropy weight method,grey comprehensive evaluation method and ideal solution method to comprehensively evaluate and analyze the power quality of each monitoring point.Secondly,the priori consistency test is performed on the ranking values of the single method,and then the evaluation values of the four single methods are combined using the average method,the least squared deviation method and the overall difference combination method,and different combination evaluation results are obtained.Then,the combined evaluation values of the four single evaluation methods are combined through the combined evaluation method of power quality combining the similarity and difference characteristics to obtain the final combined evaluation value.In the empirical part,the data of ten power quality monitoring points in a certain regional power grid is selected as the research object,and the combined evaluation model established above is used for comprehensive analysis to obtain the comprehensive evaluation value of each monitoring point,and the comprehensive quantification of the data is achieved The comprehensive ranking of each monitoring point was compared and analyzed,and the result passed the consistency test,which showed the rationality of the method.Finally,summarize the full text.