Research On Comprehensive Evaluation Method Of Power Quality Based On Grey Number Theory

With the rapid development of the national economy,the importance of electric energy to the national economy has become more and more obvious.While more and more emerging industries have brought convenience to people’s lives,they have also brought challenges to the maintenance of high-quality electric energy.So it has received more attention.Therefore,a reasonable and comprehensive assessment of power quality is also the main topic that needs to be studied today,which is of vital importance to the healthy development of the integrated power grid system.This article analyzes the meaning of various indicators of power quality in depth,combined with the current status of power quality evaluation,in order to avoid the single defect of the data to be measured,this article chooses to combine the horizontal evaluation of different things at multiple time points and compare the same thing.The vertical and horizontal evaluation method of horizontal and vertical evaluation at multiple times can evaluate the levels of multiple objects at different times;because the power quality indicators of the evaluation objects in the power grid fluctuate up and down within a certain range at all times.Certainty and ambiguity,so this paper chooses the gray number form to express the indicators to be evaluated,and through research affirmed the feasibility of the objective weighting method based on the gray number,and proposes the vertical and horizontal extension method based on the gray number,which satisfies Dynamic assessment of the objectivity requirements;this paper chooses a subjective weighting method based on the expert scoring method that integrates multiple expert opinions to avoid the influence of personal preference when subjective weighting;subjective weighting that integrates the opinions of multiple experts A comprehensive evaluation model is established by combining the method and the vertical and horizontal unfolding method based on the gray number theory.Through case analysis,it is verified that it meets the requirements of dynamic evaluation and can objectively evaluate the power quality of all objects to be evaluated in the area.On the basis of the established comprehensive evaluation model,a five-level comprehensive evaluation model from the first level that can meet high-standard power quality requirements to the fifth level that urgently needs power quality management is established,and the power quality evaluation classification is realized;and Based on the gray number-based power quality evaluation and evaluation classification,using Visual Studio 2010 and MATLAB 2010 b platform,the design and implementation of the power quality comprehensive evaluation visualization software is completed.The actual demonstration using the data collected in the S region verifies.The practicability of each module of the developed visualization software power quality comprehensive evaluation function is verified.This paper has 20 pictures,17 tables,and 83 references.