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Voltage sag severity grade judgment method

A voltage sag and judgment method technology, which is applied in the field of level judgment, can solve problems such as unreasonable division of severity levels and inaccurate assessment of voltage sag severity, so as to avoid short-term disturbances, shorten detection time, and suppress high The effect of frequency noise interference

Active Publication Date: 2018-11-30
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for judging the severity level of voltage sags, and solve the technical problems of inaccurate assessment of the severity of voltage sags and unreasonable division of severity levels in the prior art

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0046] like figure 1 As shown, it is a flow chart of a method for judging the severity level of voltage sag provided by the present invention, which includes the following steps:

[0047] Step 1: Collect grid voltage data in real time, preprocess the grid voltage data, and construct a grid voltage data sample set.

[0048] The preprocessing of grid voltage data includes: removal of singular data, digital low-pass filter processing and normalization processing. The specific methods are as follows:

[0049] Remove the singular data in the grid voltage data collected in real time and generate missing data;

[0050] If the time interval before and after the missing data is small, for example: wit...

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Abstract

The invention discloses a voltage sag severity grade judgment method. The method comprises the steps that a single-phase analysis method is adopted to detect whether a power grid has voltage sag; theregion of the current voltage sag in a tolerance curve graph of general equipment is judged according to voltage sag lasting time and voltage sag amplitude, wherein if the current voltage sag is in anequipment normal work region, first-grade severity is judged; if the current voltage sag is in an equipment fault region, extreme severity is judged; and if the current voltage sag is in a to-be-assessed region, weight coefficients of the voltage sag lasting time and the voltage sag amplitude are further calculated respectively; a weighted Euclidean distance of the current voltage sag from the equipment normal work region of the tolerance curve is calculated according to the weight coefficients; and the weighted Euclidean distance is compared with each preset voltage sag severity grade threshold to determine the severity grade of the voltage sag. Through the method, voltage sag detection speed and severity grading precision can be improved, and it is convenient to reasonably access sag severity.

Description

technical field [0001] The invention relates to a method for judging the severity level of a voltage sag, and belongs to the technical field of power grid supervision. Background technique [0002] In recent years, with the rapid development of high-tech technologies such as computer application technology, automation control technology and high-power power electronics technology, new electrical equipment based on computer and microprocessor management, analysis, detection and control has been heavily invested in power systems. These high-performance, highly automated power electronic equipment are very sensitive to system interference, and the requirements for power quality are much more stringent than traditional power equipment. Therefore, power quality issues have become a common concern of power supply departments and users. The problem of voltage drop is the most harmful one among the problems of power quality. Under the load conditions of modern power system and power...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06
Inventor 张军张国江李双伟陈兵叶超史明明罗珊珊张宸宇
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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