Load flow calculation method based on VSC internal correction equation matrix and alternate iteration method under augmented rectangular coordinates

A technology of rectangular coordinates and power flow calculation, which is applied in the field of power system and can solve problems such as complex calculation

Active Publication Date: 2020-03-27
FUZHOU UNIV
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Problems solved by technology

This method iteratively calculates the converter together with the AC network, and when it comes to the reactive power control mode, the calculation becomes more complicated by removing the converter branch

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  • Load flow calculation method based on VSC internal correction equation matrix and alternate iteration method under augmented rectangular coordinates
  • Load flow calculation method based on VSC internal correction equation matrix and alternate iteration method under augmented rectangular coordinates
  • Load flow calculation method based on VSC internal correction equation matrix and alternate iteration method under augmented rectangular coordinates

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[0102] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0103] It should be pointed out that the following detailed description is exemplary and is 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.

[0104] 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 combina...

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Abstract

The invention relates to a load flow calculation method based on a VSC internal correction equation matrix and an alternate iteration method under augmented rectangular coordinates. The calculation efficiency can be improved by utilizing the linearization relationship between the node voltage and the node injection current in the augmented rectangular coordinate model and the extremely high sparsity rate of the Jacobian matrix under the model; a correction equation and a Jacobian matrix for internal load flow calculation of a VSC (voltage source converter) under an augmented rectangular coordinate are provided; a VSC internal power flow model is established under an augmented rectangular coordinate; a VSC is decoupled from an AC network and a DC network; active power control is adjusted; original reactive power control is adopted, a network structure is kept unchanged, an AC / DC decoupling power flow algorithm model under augmented rectangular coordinates is finally obtained, only one-loop DC side power flow calculation and one-loop VSC and AC network alternate iterative calculation need to be carried out, the Jacobian matrix scale is reduced, and the convergence and calculation efficiency of power flow calculation are improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power flow calculation method based on VSC internal correction equation matrix and alternate iteration method under augmented rectangular coordinates. Background technique [0002] Currently, the power flow algorithms for hybrid power distribution networks mainly include the unified solution method and the alternate iteration method. The unified solution method is complex in calculation, the Jacobian matrix is ​​large in scale, difficult to program, and takes a long time to calculate. The AC algorithm inheritance is not high. The alternating iterative method separates the calculation of the AC and DC networks, and alternately converges. The AC network part can completely inherit the traditional AC algorithm, and the VSC control mode can be switched flexibly, which is convenient for considering the constraints of the DC system variables and the adjustment of the operation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 江岳文费迎阳
Owner FUZHOU UNIV
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