Method and system for short-circuit current calculation of flexible DC grid considering inverter control

A flexible DC and short-circuit current technology, applied in the field of power grids, can solve the problems of inability to deal with single-pole short-circuit faults, low calculation efficiency, poor adaptability, etc., and achieve the effects of easy computer efficient implementation, simple calculation method, and fast calculation speed

Active Publication Date: 2020-04-07
SHANDONG UNIV +3
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Problems solved by technology

[0006] (1) First of all, the adaptability of the two methods is insufficient, and it cannot deal with single-pole short-circuit faults involving the ground
[0007] (2) Secondly, it uses the numerical integration method to solve the differential-algebraic equations of the equivalent circuit of the DC grid. The calculation efficiency of this numerical integration method is not high. The reason for the high efficiency of these two methods is that the DC grid is equivalent
[0009] To sum up, the short-circuit current calculation method of the flexible DC power grid in the prior art has the problems of poor adaptability, low calculation efficiency, and difficult solution process, and there is still a lack of effective solutions

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  • Method and system for short-circuit current calculation of flexible DC grid considering inverter control
  • Method and system for short-circuit current calculation of flexible DC grid considering inverter control
  • Method and system for short-circuit current calculation of flexible DC grid considering inverter control

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[0061] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. 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 disclosure belongs.

[0062] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. 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.

[0063] Implementation example one

[0064] This embodiment discloses a calculation method for the short-circuit current of a f...

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Abstract

The invention provides a method and system for calculating a short-circuit current of a flexible direct current grid considering converter control. The method includes the steps that a converter station is equivalent to parallel connection of a controlled current and an RLC series branch, and a direct current grid transmission line is represented by a centralized parameter model to establish a simplified equivalent circuit of the flexible direct current grid during a short circuit; and the established equivalent circuit is solved by an accompanying circuit method to obtain a branch current when the flexible direct current grid is short-circuited. The method for calculating the short-circuit current is good in adaptability, can process various types of faults, and adapts to various networktopologies and various main wiring modes of converter stations.

Description

technical field [0001] The present disclosure relates to the field of power grid technology, in particular to a calculation method and system for short-circuit current of a flexible DC power grid considering converter control. Background technique [0002] With the development of the energy revolution, the need to transport a large amount of renewable energy to the load center (for example: the need to transport clean energy from the northwest of my country to the southeast coastal load center) forces the grid to upgrade its controllability and capacity. High Voltage Direct Current (HVDC), especially Voltage Source Converter-Based HVDC (VSC-HVDC) is widely regarded as one of the most promising solutions . The characteristics of VSC-HVDC, such as the ability to supply power to passive systems and flexible control, make it very suitable for grid-connection of large-scale renewable energy, and it is very easy to form a multi-terminal flexible DC grid (VSC-Based Multi-Terminal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 叶华高仕林刘玉田孙昕及洪泉李子衿
Owner SHANDONG UNIV
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