Improved order relation method based comprehensive evaluation method for voltage states of medium-voltage distribution lines

Abstract

The invention discloses an improved order relation method based comprehensive evaluation method for voltage states of medium-voltage distribution lines. The method comprises the steps of firstly, proposing a voltage state characteristic index system of the 10kV distribution lines in three aspects of line attributes, charge characteristics and management factors, and calculating a centesimal system score of each index of each 10kV distribution line; secondly, determining a weight of each index by applying an improved order relation method; and finally, performing multiplication and summation calculation on a value of each index and the weight corresponding to the index to obtain a voltage state comprehensive evaluation value of each 10kV distribution line, and quantitatively evaluating the voltage states of the numerous varied 10kV distribution lines. The method has the advantages of comprehensive evaluation indexes and easiness for acquiring evaluation data, has relatively high operability, practicality and applicability, and can effectively improve the voltage control efficiency and management level of the 10kV distribution lines.

Description

technical field [0001] The invention relates to the field of distribution network operation analysis, in particular to a comprehensive evaluation method for the voltage state of medium-voltage distribution lines based on the improved sequence relation method. Background technique [0002] As a link in the power system that directly faces end users, the distribution network, especially the 10kV distribution line, directly affects the reliability of power consumption and the quality of power supply for users. However, because the construction of 10kV distribution network has been underestimated for a long time, problems such as too long lines, too small cross-sectional areas, uneven power supply loads (coexistence of light loads and heavy loads), uneven load development levels, and large differences in load characteristics are very serious. Generally, the voltage of 10kV distribution lines in some areas is too low for a long time, the voltage fluctuates greatly during the peak...

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Problems solved by technology

[0003] At present, the voltage state evaluation or voltage quality management of 10kV distribution lines faces the following problems: 1) The number of 10kV distribution lines is huge, the technical status is uneven, and there are generally imperfect monitoring equipment and lack of voltage data. Data such as voltage deviation, voltage three-phase unbalance, and voltage harmonic distortion rate are very lacking; 2) At present, the voltage quality assessment of 10kV distribution lines often uses voltage deviation, voltage three-phase unbalance, voltage harmonic distortion rate, etc. Electrical parameter indicators, these indicators are only the external performance of the voltage quality, without considering the management level of the line and the characteristics of the load supplied by the line, it is difficult to fully characterize the essential cause of the voltage problem; 3) the current treatment of 10kV distribution lines often stays At the level of "event handling", it is not preventive to decide the line and treatment measures to be treated according to user complaints, voltage quality accidents, etc., and lacks a scientific and effective problem discovery mechanism and governance decision-making mechanism

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