Method for comprehensively evaluating electric energy quality based on grey theory

Abstract

The invention provides a method for comprehensively evaluating electric energy quality based on a grey theory. The method comprises the following steps that the weight of an electric energy quality evaluation index is calculated through an objective weighting entropy evaluation method; the weight of the electric energy quality evaluation index is calculated through a subjective weighting AHP method; the weight vector of the electric energy quality evaluation index is determined; the electric energy quality is comprehensively evaluated based on grey correlation analysis in the grey theory. Through the adopted combination weighting method, the defects of the single weighting method that the subjectivity of people is relied on too much in a subjective weighting method and expert opinions cannot be reflected in an objective weighting method are overcome, the expert opinions can be reflected, the actual condition of the electric energy quality can be reflected, and all subitem index weight coefficients of the scientific electric energy quality are obtained. The grey correlation analysis method is adopted on this basis, a sample to be evaluated is compared with standard samples of all electric energy quality level grades, and the comprehensive evaluation result of the electric energy quality can be objective and simple.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a gray theory-based comprehensive evaluation method for power quality. Background technique [0002] With the advancement of science and technology and the development of industrialization, a large number of non-linear and impact loads of various types are connected to the power grid. The power quality problems caused by these loads not only seriously affect the safety of power grid operation, but also affect other power users in the power grid. It will cause potential harm to electrical equipment, and at the same time cause a large amount of power loss, resulting in a waste of resources. In order to limit the impact of such loads on the power grid and provide clean power for the majority of power users, the state has promulgated a series of power quality standards and developed a variety of power quality assessment methods. In recent years, some scholars at home and abroad have conducted...

AI Technical Summary

Problems solved by technology

The combined weighting method can overcome the shortcomings of the single weighting method, such as the subjective weighting method relying too much on human subjectivity and the objective weighting method cannot reflect expert opinions, and cannot accurately reflect the importance of each sub-index of power quality. Get the scientific weighting factor

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