Short-circuit fault protection method of DC power distribution system with resistive superconducting current limiter

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...

AI Technical Summary

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 transient short-circuit current, which will cause huge damage to the system and equipment. Latching, which makes the voltage source rectifier become uncontrolled rectification, and the voltage and current of the DC side are even more uncontrollable

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