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Method for calculating sensitivity of branch breakage based on direct-current flow model

A calculation method and sensitivity technology, applied in the field of branch breaking sensitivity calculation based on the DC power flow model, can solve the problems of slow calculation speed and poor accuracy, and achieve the effects of improved calculation accuracy, simplified implementation process and high accuracy

Active Publication Date: 2014-02-19
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

In short, the DC method is simple and quick to calculate, but the accuracy is poor. The compensation method and the matrix inversion method have high calculation accuracy but the calculation speed is slow due to the processing of the matrix.

Method used

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  • Method for calculating sensitivity of branch breakage based on direct-current flow model
  • Method for calculating sensitivity of branch breakage based on direct-current flow model
  • Method for calculating sensitivity of branch breakage based on direct-current flow model

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Embodiment Construction

[0024] The branch disconnection sensitivity calculation method based on the DC power flow model and retaining high-order items proposed by the present invention first analyzes and organizes the physical nodes and their topological connection relationships in the power system into calculation nodes and their topological connection relationships through topology analysis.

[0025] Construct the susceptance matrix B before the power system branch circuit is disconnected according to the computing nodes and their topological connection relationship 0 .

[0026] Form the n-1 dimensional vector Y according to the susceptance value of the disconnected branch km and its branch (n is the number of calculation nodes, Y i is the i-th element of the vector, b km is the susceptance value of branch km). As follows:

[0027] Y = 0 . ...

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Abstract

The invention provides a method for calculating the sensitivity of branch breakage which is derived from a direct current method and in which high-order terms are reserved. The method is based on a direct-current flow model. A calculation method which is simple and convenient and higher in accuracy of a calculated result is provided on the basis of analysis of the conventional direct current method for solving the sensitivity. In the method, the high-order terms are reserved by fully utilizing status information before and after breakage in solving of the sensitivity, and calculated amount is not increased in calculation process; moreover, because the high-order terms are not removed, an error only comes from the direct-current flow model, so that calculation accuracy is improved. Due to simple, convenient and high-accuracy calculation, the method can be widely applied to all application fields of network analysis of a power system, such as the fields of simulation, analysis and calculation of an energy management system (EMS), a dispatcher training system (DTS) and the power system, and the method has a good promotion application value.

Description

technical field [0001] The invention belongs to the technical field of electric power automation, and in particular relates to a branch circuit breaking sensitivity calculation method based on a DC power flow model. Background technique [0002] The traditional calculation methods for branch breaking sensitivity include direct current method, branch addition method and matrix inversion method. Due to the omission of high-order terms in the traditional DC method, the calculation error increases, which affects the practical application of power system network analysis. The branch addition method and the matrix inversion method are deduced from different angles, and there is no error in the reasoning process, but the reasoning process is complicated. [0003] Applying the branch disconnection sensitivity calculation method based on the DC power flow model and retaining high-order terms to the power system network analysis will maximize the power system network analysis ability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 韩巍李强贾伟孟令愚易善军杨宁邵广惠高德宾刘家庆李群李忠满
Owner CHINA ELECTRIC POWER RES INST
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