Subjective and objective classification combination weighting method for comprehensive evaluation of power quality

Abstract

The invention discloses a subjective and objective classification combination weighting method for comprehensive evaluation of power quality, which is used for weight calculation in the comprehensive evaluation of the power quality and comprises the following steps of: constructing a typical load set and a typical equipment set of a power grid; calculating the weight Mk of typical equipment in the typical load; sorting each power quality index according to the weight Mk of the load classification; obtaining a subjective weight Wi by using an improved analytic hierarchy process according to a sorting result of the electric energy quality indexes; obtaining an objective weight Vi by adopting an improved entropy weight method; and the subjective weight Wi and the objective weight Vi are utilized to obtain a subjective and objective combined weight, namely a comprehensive weight Ai. According to the method, subjective components are greatly reduced on the premise of ensuring that the subjective performance of the user is embodied by utilizing classification combination weighting; according to the method, preferences and demands of the user are considered, objectivity is guaranteed, the comprehensive weight is more accurate, and correctness, rationality, scientificity and effectiveness of weighting are improved.

Description

technical field [0001] The invention belongs to the technical field of power quality evaluation, and in particular relates to a subjective and objective classification combination weighting method for comprehensive evaluation of power quality. Background technique [0002] With the development of science and technology and the progress of society, electric energy has become an indispensable and important energy source in modern life. As an important characteristic of power quality, power quality has received more and more attention. More and more power electronic devices in the power grid promote the development of the power system on the one hand, but have a great impact on the power quality on the other hand. The load of modern power system is more and more complex, especially the nonlinear load has an impact on the power quality. At the same time, the grid connection of distributed power sources also has an impact on power quality. The deterioration of power quality wi...

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the above problems, the present invention provides a subjective and objective classification and combination weighting method for comprehensive evaluation of power quality, so as to solve the problem that in the existing weighting methods, the subjective weighting method completely relies on expert experience and is too subjective; The results of the objective weighting method are inaccurate and cannot meet the special needs of users; the subjectivity of the combined weighting method has a greater impact on the evaluation results, and the subjectivity is too strong

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