Coordination and protection method and device of DC grid having resistive type superconductive current limiter

A technology of superconducting current limiter and DC power grid, which is applied to emergency protection circuit devices, electrical components, fault locations, etc., and can solve problems such as the lack of basis for coordinated protection and cooperation methods

Active Publication Date: 2018-02-23
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no basis for the coordination and protection of the

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  • Coordination and protection method and device of DC grid having resistive type superconductive current limiter
  • Coordination and protection method and device of DC grid having resistive type superconductive current limiter
  • Coordination and protection method and device of DC grid having resistive type superconductive current limiter

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Embodiment Construction

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. 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.

[0022] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically or electrically connected; it can be directly connected, or indirectly connected through an intermediary, or it can be the internal communication of two components, which can b...

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Abstract

The invention discloses a coordination and protection method and device of DC grid having a resistive type superconductive current limiter. The resistive type superconductive current limiter is put into a fault discharging loop. The method comprises the steps of obtaining a first impedance scope of the resistive type superconductive current limiter when the fault discharging loop reaches to the over-damping state; obtaining a second impedance scope of the resistive type superconductive current limiter when the fault current of the fault discharging loop begins to be attenuated; obtaining a third impedance scope of the resistive type superconductive current limiter based on the movement time of a master breaker in a DC breaker; obtaining the impedance value of the resistive type superconductive current limiter based on the first impedance scope, the second impedance scope, and the third impedance scope. The invention is advantageous in that through selecting the impedance value of the superconductive current limiter, the fault current can be effectively inhibited; it can be guaranteed that the DC breaker can reliably turn off the fault current, and the voltage and current stress ofa switch member can be reduced.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a method and device for coordinated protection of a direct current power grid containing a resistive superconducting current limiter. Background technique [0002] Flexible DC transmission based on Modular Multilevel Converter (MMC) has the advantages of high modularity, flexible control of active and reactive power, and the ability to supply power to passive loads. It is widely used in wind farm grid connection and isolated islands. And weak grid power supply and urban power supply and other fields. At the same time, the DC power grid is a "low damping" system, the fault current develops rapidly and the fault affects a wide range. At present, the mainstream method of DC power grid to solve the DC line fault problem is to install high-voltage DC circuit breakers (DC circuit breakers, DCCB) on both sides of the DC line. Through a reasonable fault detection an...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/086H02H7/268
Inventor 赵成勇孔明吴亚楠许建中谢素娟赵坚鹏
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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