Short circuit fault protection method for DC power distribution system with resistance type superconducting current limiter

A technology of superconducting current limiter and DC power distribution, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as large transient short-circuit current, damage to systems and equipment, uncontrollable DC side voltage and current, etc., to achieve guaranteed reliability effect

Inactive Publication Date: 2015-08-19
TIANJIN UNIV
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Problems solved by technology

However, since the DC power distribution system requires a large number of capacitors for voltage stabilization and filtering, when a short-circuit fault occurs, the capacitor will be discharged instantaneously, resulting in a very large tr...

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  • Short circuit fault protection method for DC power distribution system with resistance type superconducting current limiter
  • Short circuit fault protection method for DC power distribution system with resistance type superconducting current limiter
  • Short circuit fault protection method for DC power distribution system with resistance type superconducting current limiter

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Embodiment Construction

[0019] In order to overcome the deficiencies of the prior art, the present invention provides a protection method for a DC power distribution system containing a resistive superconducting current limiter. The protection principle used in this protection scheme is simple, and the speed is good and the reliability is good when the line fails. High, providing technical support for the safe and reliable operation of the DC power distribution system.

[0020] In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

[0021] The invention provides a line protection method for short-circuit faults of a DC power distribution system containing a resistive superconducting current limiter. The scheme includes the following steps:

[0022] Step 1: Judging whether the sudden change in voltage exceeds the threshold value, and determining whether the starting element operates: according to the collected information on th...

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Abstract

The invention provides a protection method for a DC power distribution system with a resistance type superconducting current limiter. DC voltage and DC current information acquired from the installing part of head end protection of all feed-out lines is utilized, the voltage sudden variable principle is applied to act as fault starting elements of DC buses and DC lines, the transient peak over-current protection principle is applied to act as I-phase protection of the DC lines, and transient over-current started time-limited undervoltage protection is applied to act as II-phase protection of the DC lines based on DC circuit breakers so that the overall length of the lines is protected. Influence on protection of the DC power distribution system caused by accessing of the current limiter can be effectively avoided, and fault lines can be rapidly cut.

Description

Technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a protection method for short-circuit faults of DC power distribution systems containing resistive superconducting current limiters. Background technique [0002] Smart grid is the latest trend in the development and transformation of the power system in the world today, and it is a major technological innovation and development trend of the power system in the 21st century. The future development direction of the smart grid is mainly concentrated in the distribution network, and the forward-looking research in the field of distribution network is being actively carried out internationally. [0003] At present, more and more household appliances and office appliances use direct current as the final form of power consumption, such as mobile phones, LCD monitors, computers, electric vehicles, etc.; increasing household loads and industrial loads use frequen...

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Application Information

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IPC IPC(8): H02H7/26
Inventor 薛士敏高峰孙文鹏李博通
Owner TIANJIN UNIV
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