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Protection method for short-circuit fault of direct-current line of radial direct-current power distribution system

A DC line, short-circuit fault technology, applied in emergency protection circuit devices, electrical components and other directions, can solve problems such as large differences, less research on equipment protection principles, and insignificant reference significance, and achieves good rapidity and excellent quickness. , to ensure the effect of reliability

Active Publication Date: 2014-04-16
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research rarely involves the protection principle and configuration of the DC power distribution system. The existing protection research also mainly focuses on exploring the performance differences between DC circuit breaker-based and non-DC circuit breaker-based protection, the cooperation between multi-regional protection and DC power distribution system protection requirements standards, etc., the research on the protection principle of equipment in the DC power distribution system is less, especially the exploration of the protection principle of the DC power distribution line
At present, the DC line protection that can be referred to mainly focuses on DC traction, ship DC power distribution, and high-voltage DC transmission.

Method used

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  • Protection method for short-circuit fault of direct-current line of radial direct-current power distribution system
  • Protection method for short-circuit fault of direct-current line of radial direct-current power distribution system
  • Protection method for short-circuit fault of direct-current line of radial direct-current power distribution system

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] Embodiments The protection method for the short-circuit fault of the DC line of the radial DC power distribution system provided by the present invention is applied to such as figure 2 On the simulation model of the DC power distribution system shown, the example verification is carried out.

[0029] In the example model, the DC link voltage is 20kV and the DC current is 0.5kA during steady state operation. For this model, the setting values ​​of each parameter in the protection action criterion are set as follows.

[0030] du / dt _set =600V / ms, I max =1kA, k=2, ΔI _set =0.5kA, ΔT _set =2ms

[0031] Set the transient fault in the PSCAD model, input the data of DC voltage and DC current before and after the fault into the fault criterion realized by Matlab programming, and draw the following conclusions:

[0032] (1) For a direct short-circuit fa...

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Abstract

The invention provides a protection method for a short-circuit fault of a direct-current line of a radial direct-current power distribution system. The protection method for the short-circuit fault of the direct-current line of the radial direct-current power distribution system comprises the steps that a fault monitoring point is set; a component is started to act; the short-circuit fault of the direct-current line is determined, and a direct-current breaker is switched off. According to the protection method for the short-circuit fault of the direct-current line of the radial direct-current power distribution system, the principle of the method is simple, the speedability is good when the fault of the line occurs, maloperation can be avoided under the condition that the fault of a subordinate direct-current power distribution line or a subordinate alternating-current power distribution line is most serious, and technical support is provided for the safe and reliable operation of the direct-current power distribution system.

Description

technical field [0001] The invention relates to a protection method, in particular to a protection method for a short-circuit fault of a DC line in a radiation-type DC power distribution system. Background technique [0002] As a new type of power distribution technology, DC power distribution technology based on pulse width modulation has the advantages of high power quality, large transmission capacity, high reliability, simple topology, good economy and low power loss, especially suitable for distributed power Multi-point access can vigorously promote the development of DC home appliances and "DC ecological residences", which is in line with the inherent requirements of the development of smart grids. Therefore, many scholars at home and abroad have turned their attention to the research of DC power distribution system. At present, the research on DC power distribution system is still in the stage of theoretical analysis, modeling simulation and experimental research. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 薛士敏陈超超韦涛崔艳妍惠慧时珊珊
Owner STATE GRID CORP OF CHINA
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