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Large grid Thevenin equivalent parameter online identification method based on LU decomposition

A Thevenin equivalent and identification method technology, which is applied in the field of value parameter online identification improvement, can solve problems such as greater influence on voltage stability, loss of machine terminal voltage control capability, jumping of Thevenin equivalent parameters, etc., to achieve accurate Thevenin parameters, The effect of real-time prevention and control is of great significance and fast calculation speed

Inactive Publication Date: 2019-03-19
SHANDONG UNIV +1
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AI Technical Summary

Benefits of technology

This new technology allows us to accurately identify specific electrical properties (such as resistance) within different sections or parts of electric networks during normal operation without having to measure them individually at once. It also provides quicker calculations than previously possible due to its ability to determine these values from data collected through simulations. Overall, it offers technical benefits over existing techniques such as current methods but has several advantages compared to older ones like those mentioned earlier.

Problems solved by technology

Technological Problem: Current Conventional Ground Phase Responsive Force Measurements Technique involves calculating analog voltages from an isolated source at different frequencies or phases. These techniques have drawbacks due to their complexity and slow computation times. Additionally, these conventional systems rely heavily upon assumptions about inductivity between specific parts of the grid, leading to incorrect conclusions.

Method used

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  • Large grid Thevenin equivalent parameter online identification method based on LU decomposition
  • Large grid Thevenin equivalent parameter online identification method based on LU decomposition
  • Large grid Thevenin equivalent parameter online identification method based on LU decomposition

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Embodiment Construction

[0055] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0056] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0057] The premise of applying Thevenin equivalent to online analysis of voltage stability is the rapid and accu...

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Abstract

The invention discloses a large grid Thevenin equivalent parameter online identification method based on LU decomposition, comprising: based on the single state section data of a large grid, directlyusing a node voltage equation to obtain an open-circuit voltage at a node to be solved as a Thevenin equivalent potential and then obtaining all Thevenin equivalent parameters; when a generator node is reactive out of limit, changing the type of a PV node in order that the PV node becomes a PQ node, and quantifying and calculating the equivalent parameters; in the process of solving the open-circuit voltage of different nodes, because a constructed linear node voltage equation coefficient matrix is a constant matrix, obtaining an equation solution by using LU triangular decomposition through fast back substitution.

Description

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Claims

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Application Information

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Owner SHANDONG UNIV
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