A Method for Comprehensively Evaluating Power Quality of Regional Distribution Network

Abstract

The invention discloses a method for comprehensively evaluating the power quality of a regional distribution network, comprising: preset several individual power quality indexes as evaluation standards; index and single steady-state power quality index; calculate and obtain the score of each single transient power quality index and each single steady-state power quality index of each node; add the comprehensive weight to obtain the final score of each node, and the comprehensive weight is passed by The combination of objective weight and subjective weight is obtained; the node with the lowest final score is found; the scores of each individual power quality index in the node with the lowest final score are compared with the preset thresholds of each individual power quality index to complete the comprehensive evaluation of power quality. The present invention overcomes the situation that cannot be solved by the single-item evaluation method in which each single item of power quality is qualified but the combination fails.

Description

Technical field [0001] The present invention belongs to the field of power grid power quality evaluation technology, particularly relates to a method for comprehensively evaluating the power quality of regional distribution networks. Background [0002] The quality of electricity directly affects the efficiency of electricity and the national economy. Due to the sharp increase in power load, especially the increasing impact and nonlinear load, the power grid has power quality problems such as voltage distortion, voltage fluctuation, flicker, three-phase imbalance and voltage sag. In recent years, due to the rising trend of accidents and problems caused by power quality, it is imperative to manage power quality and control power pollution. With the increasing prominence of power quality problems, countries have formulated relevant power quality standards according to their actual conditions. However, the standards formulated only set a ruler for the power quality indicators to det...

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Problems solved by technology

[0003] The connotation of power quality is extensive, and it is a complex that includes multiple indicators. It is impossible to judge the overall quality of power quality through whether a single power quality indicator meets the standard, and it cannot meet the needs of both parties in the power market. In actual production, power quality The indicators often do not belong to the same level, but belong to multiple different levels. Therefore, evaluating a certain indicator of a certain power grid alone cannot fully and accurately reflect the quality of the power quality of the power grid. , and when all individual indicators are qualified, it is impossible to evaluate the quality of the entire power grid through individual indicators. while accurately assessing power quality

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