A method and system for comprehensive evaluation of power quality

Abstract

The invention provides a comprehensive assessment method of power quality. The comprehensive assessment method of the power quality comprises the steps of acquiring J sample sets corresponding to distributive J data acquiring nodes according to the power quality monitoring data, public information data and power user data; extracting the same user characteristics vectors to obtain the corresponding J training sample sets; conducting data transformation to obtain J data set stored by means of data block; treating K security levels as the type of class of the common classification properties; classifying and counting the J data sets to obtain the corresponding prior probability and condition probability of each class; obtaining the class probability of each class through the bayes formula; and determining the security level corresponding to the class with the maximum probability in the class probability as the security level of the current power quality of a power circuit. The comprehensive assessment method of the power quality has the advantages that a plurality of data are taken into account, a bayes classifying model is trained by mass samples, and then the transient power quality can be quickly assessed and predicted on the basis of the model.

Description

technical field [0001] The invention relates to the technical field of power system and computer data processing technology, in particular to a method and system for comprehensive evaluation of power quality. Background technique [0002] The results of comprehensive evaluation of power quality are often used as the basis for power supply and consumption parties to formulate power supply contracts, which help both parties to clarify power quality responsibilities, and can be used as an important reference for power commodity pricing by quality. At the same time, the comprehensive evaluation of power quality is the premise of power quality management, and it is a quantitative indicator of the power quality of power supply points in the power grid. [0003] At present, although many national standards and documents have studied the evaluation methods of individual indicators of power quality, there are few studies on comprehensive evaluation of power quality. The main reason i...

AI Technical Summary

Problems solved by technology

In the prior art, the comprehensive evaluation of power quality is based on single-item evaluation. The corresponding method is to quantify part or all of the power quality disturbances or multiple characteristic indicators of a certain power quality disturbance according to attributes, and then use normalization and comprehensive The algorithm obtains a comprehensive index or comprehensive grade. The disadvantage is that each power quality index has obvious irrelevance, which makes it difficult to determine their corresponding weighting coefficients.

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