Method and system for calculating AC-DC hybrid power flow of DC layered structure

An AC-DC hybrid and layered structure technology, which is applied in the direction of AC network circuits, power transmission AC networks, and AC networks with the same frequency from different sources, can solve the problems of large expression differences, poor convergence reliability, Correct the ill-conditioned problems of the equation to achieve the effect of avoiding the selection of initial values, overcoming the deterioration of convergence, and small changes

Inactive Publication Date: 2019-03-12
SHANDONG UNIV +3
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Problems solved by technology

The selection of the initial value should be considered for the newly added control variable, and the solution of the Newton-Raphson method is strongly dependent on the initial value of the variable, so the simultaneous solution method also has the problems of slowing down the convergence speed and degrading the convergence reliability
At the same time, the expression of the newly added control objective equation is quite different from that of the classic power flow equation, and the modified equation may be ill-conditioned under certain conditions

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  • Method and system for calculating AC-DC hybrid power flow of DC layered structure
  • Method and system for calculating AC-DC hybrid power flow of DC layered structure
  • Method and system for calculating AC-DC hybrid power flow of DC layered structure

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[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] 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.

[0049] 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 combinatio...

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Abstract

The invention discloses a method and system for calculating an AC-DC hybrid power flow of a DC layered structure. The method comprises the following steps: completing the state calculation of a DC network according to the control mode of a converter station, causing the connection point of the DC network and the AC network to be equivalent to a power node, and calculating the flow using a Newton-Raphson method. The method and system not only overcome the problem of convergence deterioration caused by alternating iterations of the alternating iterative method, but also avoids the problems of initial value selection and Jacobian matrix scale expansion caused by the simultaneous method, and have double advantages of good convergence and less memory occupation during the iterative process.

Description

technical field [0001] The invention relates to a method and a system for calculating an AC-DC hybrid power flow considering a DC layered structure. Background technique [0002] There are two main types of methods for AC / DC hybrid power system power flow: alternating iteration method and simultaneous solution method: [0003] 1) The main advantage of the alternate iteration method is that the original node admittance matrix and Jacobian matrix are not changed in the main iteration, only the node power balance equation needs to be slightly modified, and it is easy to combine with the original power flow algorithm and realize programming. Its disadvantage is that the control variable of the newly added component device is only corrected in the sub-iteration, and the value of the control variable in the main iteration process keeps the corrected given value in the sub-iteration unchanged, and the difference caused by the interaction between the two parts of the iterative proce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/36
CPCH02J3/06H02J3/36H02J2203/20G01R21/1331H02J5/00H02J2203/10Y02E60/60G01R21/003
Inventor 陈全董晓明杨明李海峰金涛易俊屠竞哲
Owner SHANDONG UNIV
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