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A method for determining parameters of pseudo-bipolar DC grid components

A component parameter, DC power grid technology, applied in electrical components, AC network circuits, power transmission AC networks, etc., can solve problems such as inaccurate fault path analysis, inconvenient relationship between fault currents, and failure to consider non-fault pole dynamic processes. , to achieve the effect of reducing cost input and limiting fault current

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +1
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  • Description
  • Claims
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Problems solved by technology

[0004] The method provided by the existing technology does not consider the dynamic process of the non-fault pole after the fault, and the analysis of the fault path is not accurate, so accurate calculation results cannot be obtained, and the calculation method proposed is not convenient for analyzing the influence of circuit parameters on the fault current relation
Or it analyzes the influence of the grounding method on the fault current, which provides a reference for the selection of the grounding method, but does not qualitatively analyze the influence of the grounding electrode parameters on the fault current, and gives the parameter selection range

Method used

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  • A method for determining parameters of pseudo-bipolar DC grid components
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Embodiment Construction

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of this application.

[0034] It is to be understood that the terms "comprising" and "comprising" used in the description and claims of this application indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude one or more other The presence or addition of features, integers, steps, operations, elements, components and / or sets thereof.

[0035] figure 1 It is a schematic diagram of a DC power grid according to an e...

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Abstract

This application provides a method for determining parameters of DC power grid components. The DC power grid includes at least two converter stations and at least one DC line between the converter stations. The method includes: determining the component parameters of the power grid to be determined; based on the topology of the power grid and the Component parameters determine the state matrix; based on the state matrix and the DC line fault current time domain expression, determine the relationship between the DC line fault current changing with time with one component parameter of the power grid as a variable; based on the DC line fault current The suppression requirements of fault current on the line determine the range of component parameters of the power grid.

Description

Technical field [0001] The present application relates to the field of power electronics technology, and specifically to a method for determining parameters of pseudo-bipolar DC power grid components. Background technique [0002] With the advancement of power electronics technology, flexible DC transmission technology based on voltage source converters (VSC) has outstanding advantages in asynchronous networking and renewable energy grid integration, especially the high-voltage large-voltage power supply of modular multi-level converters (MMC). The capacity transmission capability makes it an inevitable choice for future DC grid development. [0003] However, fault currents propagate extremely fast in DC grids and power electronic equipment has poor overcurrent tolerance. Compared with conventional thyristor-based DC converters (LCCs), IGBT components in MMCs are more susceptible to fault currents. Locked up or even damaged. This puts forward more stringent technical requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H7/26G01R31/52
CPCH02J3/36H02H7/268G01R31/52H02J2203/20Y02E60/60
Inventor 邵震霞程骁卢宇李钢汪楠楠姜崇学邱德锋
Owner NR ELECTRIC CO LTD
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