Protection method for short-circuit fault of DC line in radial DC power distribution system

A technology for DC line and DC power distribution, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as insignificant reference significance, large differences, and less research on equipment protection principles, to ensure reliability and fastness. , the effect of excellent quickness

Active Publication Date: 2016-05-25
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 DC line in radial DC power distribution system
  • Protection method for short-circuit fault of DC line in radial DC power distribution system
  • Protection method for short-circuit fault of DC line in radial DC power distribution system

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Embodiment Construction

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

[0028] The embodiment applies the protection method provided by the present invention for the DC line short-circuit fault of the radiating DC power distribution system in such as figure 2 On the simulation model of the DC power distribution system shown, an example is verified.

[0029] In the example model, the DC line 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 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) There is a direct short-circuit fault at the end of the medium-voltage DC line, th...

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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 of a radiating DC power distribution system. Background technique [0002] As a new type of power distribution technology, pulse width modulation-based DC power distribution technology has the advantages of high power quality, large transmission capacity, high reliability, simple topology, good economy and low power loss, and is especially suitable for distributed power sources. Multi-point access can vigorously promote the development of DC home appliances and "DC ecological houses", which meets the inherent requirements of the development of smart grids. Therefore, many scholars at home and abroad have set their sights on the research of DC distribution systems. At present, the research on DC distribution system is still in the stage of theoretical analysis, modeling and simulation and experimental research. [0003] In order to ensure...

Claims

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Application Information

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Patent Type & Authority Patents(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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