Piecewise fitting method and system of lightning current amplitude probability distribution function

A technology of probability distribution function and lightning current amplitude, applied in the field of data fitting, which can solve problems such as unsatisfactory fitting accuracy and effect, low polynomial order, and computational complexity.

Inactive Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when there are many data points, the polynomial order is too low, and the fitting accuracy and effect are not ideal. To improve the fitting accuracy and effect, it is necessary to increase the order of the curve,

Method used

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  • Piecewise fitting method and system of lightning current amplitude probability distribution function
  • Piecewise fitting method and system of lightning current amplitude probability distribution function
  • Piecewise fitting method and system of lightning current amplitude probability distribution function

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Embodiment 1

[0072] See figure 2 , figure 2 It is a step-by-step flow chart of a method for segmentally fitting the lightning current amplitude probability distribution function. figure 2 A segmented fitting method of the probability distribution function of lightning current amplitude is shown. This method obtains the probability distribution function curve of lightning current amplitude in a specific area more accurately by means of segmented curve fitting, and based on this The function calculates the lightning strike trip rate of the line, and accurately provides direct data reference for the electric power department to delineate the lightning protection weak area of ​​the regional power grid.

[0073] The technical solution adopted in this embodiment is:

[0074] 1. Determination of the segment points of the lightning current amplitude probability distribution function curve

[0075] The probability of lightning current amplitude is a necessary parameter to characterize the fre...

Embodiment 2

[0121] This embodiment discloses a segmented fitting system for the probability distribution function of lightning current amplitude, which specifically includes the following devices:

[0122] 1. Lightning current amplitude probability distribution function curve fitting device,

[0123] The device fits the lightning current amplitude probability distribution function curve through the original data collected by the lightning location system;

[0124] The original data of the lightning positioning system in the device is the basic data provided by the unified time lightning positioning system established by the GPS system for the characteristics of lightning activities, and can obtain the time, position, amplitude and polarity of lightning current and the number of return strikes in real time. .

[0125] 2. Curve inflection point solving device,

[0126] The device finds the inflection point of the curve on the lightning current amplitude probability distribution function c...

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Abstract

In order to improve the condition that a certain deviation of a lightning trip-out rate exists between lightning current amplitude probability distribution functions recommended by regulations and the IEEE (Institute of Electrical and Electronic Engineers) and practical lightning current amplitude probability distribution, the invention discloses a piecewise fitting method of a lightning current amplitude probability distribution function. According to the method, a numerical analysis method is adopted to perform piecewise fitting on the lightning current amplitude probability distribution function, continuity correction is performed, and a curve of the lightning current amplitude probability distribution function, which is obtained in the way, is strongly relevant to a practical lightning current amplitude probability curve. As is well-known, the lightning current amplitude probability distribution function is an important calculating parameter for calculating the lightning trip-out rate of an electric transmission line, and the accuracy of a value directly influences the accuracy of a calculating result of the lightning trip-out rate. Therefore, by using the fitting method disclosed by the invention, the more accurate lightning trip-out rate can be obtained, and operation reference is supplied to the department of electric power operation for designating a lightning protection weak area of a regional power grid.

Description

technical field [0001] The invention relates to the technical field of data fitting, in particular to a method and system for segmentally fitting a lightning current amplitude probability distribution function. Background technique [0002] Among the various accidents in the power system, the faults of transmission lines account for the majority, and the faults of high-voltage transmission lines are mainly caused by lightning strikes. The lightning parameters used to calculate the lightning tripping rate in my country include thunderstorm day, ground flash density, and lightning current amplitude probability function. These parameters are important basic data used to represent the characteristics of lightning activity in lightning protection work. The probability distribution function of lightning current amplitude (that is, the probability of exceeding the lightning current I) is an important calculation parameter for calculating the lightning trip rate of transmission line...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张弦刘刚邱梓庭刘峻岐马浩禹周露游阳王湘女
Owner SOUTH CHINA UNIV OF TECH
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