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An Alternative Iterative Power Flow Calculation Method for LCC-MMC Hybrid DC Grid

A technology of alternate iteration and power flow calculation, applied in the direction of DC network circuit device, AC network circuit, power transmission AC network, etc., can solve the problems of low calculation accuracy and poor operability.

Active Publication Date: 2022-03-18
YUNNAN POWER GRID
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Problems solved by technology

[0004] This application provides an alternate iterative power flow calculation method for LCC-MMC hybrid DC grid to solve the problems of poor operability and low calculation accuracy of existing calculation methods

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  • An Alternative Iterative Power Flow Calculation Method for LCC-MMC Hybrid DC Grid
  • An Alternative Iterative Power Flow Calculation Method for LCC-MMC Hybrid DC Grid
  • An Alternative Iterative Power Flow Calculation Method for LCC-MMC Hybrid DC Grid

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Embodiment Construction

[0066] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0067] see figure 1 , a flowchart of an alternate iterative power flow calculation method for an LCC-MMC hybrid DC grid.

[0068] An embodiment of the present application provides an alternate iterative power flow calculation method for an LCC-MMC hybrid DC power grid, characterized in that the method includes:

[0069] S100. Obtain work information of each converter station, where the work information at least includes: all control modes, control command value...

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Abstract

The present application provides a method for calculating the alternating and iterative power flow of the LCC-MMC hybrid DC power grid, wherein the method includes: acquiring work information of each converter station; determining the node type of the busbar of the converter station according to the work information ; According to the node type, set the initial value of the related variables of the busbar node of the converter station; obtain the power loss of each converter station; calculate the power flow value of the DC power grid according to the power loss and the initial value of the related variable ; Calculate the single iterative power flow value of the AC system according to the power flow value of the DC power grid; calculate the internal variable value of each LCC converter station according to the single iterative power flow value; and the internal variable values ​​of the two previous and subsequent LCC converter stations to determine whether the AC system is converged. The calculation method provided by this application can effectively solve the problems of poor operability and low calculation accuracy of existing calculation methods.

Description

technical field [0001] The present application relates to the technical field of high-voltage direct current transmission, and in particular to an alternate iterative power flow calculation method for an LCC-MMC hybrid direct current power grid. Background technique [0002] The DC power grid is a transmission system consisting of three or more converter stations connected in series, parallel or hybrid through DC lines. According to the different switching devices used in the converter, the DC grid can be further divided into traditional DC grids based on Line Commutated Converters (LCC) and those based on Voltage Source Converters (VSC). Flexible DC grids, and hybrid DC grids that contain both LCCs and VSCs. Modular Multi-level Converter (MMC) is one of the most popular topologies in VSC, and its application range is also the widest. At present, the multi-terminal DC transmission systems in operation in the world are all LCC-type traditional DC transmission systems or MMC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/36H02J1/00
CPCH02J1/00H02J3/06H02J3/36H02J2203/20Y02E60/60
Inventor 游广增徐政朱欣春李玲芳肖亮
Owner YUNNAN POWER GRID
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