Electric energy quality synthesis evaluation system

Abstract

The invention relates to a power quality comprehensive evaluation system in the technical field of the electric power application; in the invention, a power quality collecting module obtains all items of power quality indexes from an electric fence; a power quality index grading module divides the power quality indexes obtained from the power quality collecting module into setting grades according to national standard or international generally recognized requirements; a probability distribution matrix obtaining module obtains probability of the power quality in each grade, and then the probability of the power quality index in each grade is obtained for obtaining a probability distribution matrix; a weight vector obtaining module obtains weight vector of the power quality index; an evaluation quantized value obtaining module obtains the only quantized value of the power quality comprehensive evaluation according to the probability distribution matrix and the weight vectors of all the indexes; a power quality evaluation module compares the only quantized value with the evaluation system for obtaining power quality evaluation result. The system can really reflect the probability characteristics of the power quality indexes and can comprehensively and objectively carry out comprehensive evaluation to the power quality.

Description

technical field [0001] The invention relates to a system in the field of electric power application technology, in particular to a comprehensive evaluation system for power quality. Background technique [0002] Power quality is an organic synthesis of multiple indicators. Although countries around the world have formulated a series of standards for each power quality indicator, these standards used to determine whether a single indicator is qualified or unqualified cannot fully, truly and uniquely reflect the total power. the nature of the quality. With the rapid development of the economy, the following new problems have emerged in terms of power quality requirements: On the one hand, due to the existence of a large number of nonlinear and impact loads connected to the power system or other disturbance sources, the power quality problems in the power grid are becoming more and more serious ; On the other hand, due to the extensive use of many precision instruments and equ...

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Problems solved by technology

[0002] Power quality is an organic synthesis of multiple indicators. Although countries around the world have formulated a series of standards for each power quality indicator, these standards used to determine whether a single indicator is qualified or unqualified cannot fully, truly and uniquely reflect the total power. nature of mass

With the rapid development of the economy, the following new problems have emerged in terms of power quality requirements: On the one hand, due to the existence of a large number of nonlinear and impact loads connected to the power system or other disturbance sources, the power quality problems in the power grid are becoming more and more serious ; On the other hand, due to the extensive use of many precision instruments and equipment based on computers and microprocessor controllers, users have higher and higher requirements for power quality

[0004] According to the literature search of the prior art, Tan Jiamao et al. published "Research on Comprehensive Evaluation Method of Power Quality Based on Fuzzy Theory" in "Relay" (2006, 34(3): 55-59), in which the combination level Analytical hierarchy process (AHP) and fuzzy method to comprehensively evaluate the power quality, its shortcomings are: when there are many indicators considered, sometimes the judgment matrix does not have consistency when using AHP, and fuzzy mathematics has a great influence on the membership function There is no unified general theorem or calculation formula for the establishment of , which is largely affected by subjective factors

[0005] At present, there is no standard for determining the weight of various indicators of power quality in the power system.

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