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Substation SAV message estimation algorithm based on Lagrange interpolation

An estimation algorithm and substation technology, applied to electrical components, digital transmission systems, error prevention, etc., can solve problems such as delay or loss

Inactive Publication Date: 2013-10-23
HUNAN UNIV +1
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Problems solved by technology

[0005] The present invention mainly solves the problem that the sampled value message (sampled value, SAV) of the substation is easily delayed or lost, and proposes a sampled value message estimation algorithm based on Lagrangian interpolation

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  • Substation SAV message estimation algorithm based on Lagrange interpolation
  • Substation SAV message estimation algorithm based on Lagrange interpolation
  • Substation SAV message estimation algorithm based on Lagrange interpolation

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[0031] specific implementation

[0032] The basic principle of Lagrangian quadratic interpolation used in this algorithm is:

[0033] The function y=f(x) has 3 different points x on the interval [a, b] 0 , x 1 , x 2 The function values ​​of y are respectively 0 ,y 1 ,y 2 , L 2 (x)∈P 2 , and satisfy the interpolation condition:

[0034] L 2 (x i )=y i , i=0,1,2

[0035] where P 2 Represents the polynomial function space composed of all polynomials whose degree does not exceed 2, which is called L at this time 2 (x) is a 2-degree Lagrangian interpolation polynomial of function y=f(x), L 2 The expression of (x) is as follows:

[0036]L 2 (x)=l 20 (x)y 0 +l 21 (x)y 1 +l 22 (x)y 2

[0037] in

[0038] l 20 ( x ) = ( x - x 1 ...

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Abstract

The invention provides a substation SAV message estimation algorithm based on the Lagrange interpolation. The algorithm is mainly characterized in that the algorithm is used for handling a message loss or delay situation in the process of SAV message transmission, judging a message loss situation according to specified algorithm steps, determining a message loss scenario and using the Lagrange interpolation method to estimate a sampled value of a lost or delayed message according to a sampled value or an estimated value of a message around the lost or delayed message. SAV message estimation principles in the algorithm are taken as basic standards to realize optimal message estimation during packet loss estimation. The algorithm has high estimation accuracy and high execution speed and is suitable for practical application in substations.

Description

technical field [0001] The invention is an adaptive sampling value message estimation algorithm based on Lagrangian interpolation, which mainly solves the problem that the sampled value message (sampled value, SAV) of a substation is prone to delay or loss, and is conducive to maintaining the stability of the substation , Reliable operation. technical background [0002] As the development direction of the next-generation substation, the smart substation is the physical basis and requirement for building a smart grid. The communication mode between the process level switchgear and the bay level protection control equipment in the smart substation mainly adopts the process bus communication based on the serial communication network of switched Ethernet. The IEC61850 standard defines two abstract models: GOOSE (generic object oriented substation event, generic object-oriented substation event) message and SAV message. Among them, the SAV model is applied to the transmission ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/24
Inventor 罗杰曹一家黄小庆张志丹罗学礼曹敏
Owner HUNAN UNIV
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