Direct current system line fault positioning method

A technology for DC system and line faults, applied in fault locations, fault detection by conductor type, measurement devices, etc., can solve problems such as difficulty in automation of personnel quality, inability to locate faults, affecting positioning accuracy and reliability, etc.

Active Publication Date: 2017-01-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The identification and calibration of the wave head has high requirements on the quality of personnel, and it is difficult to realize automation
When there is a transition resistance and the amplitude of the traveling wave head is limited, it is more difficult to accuratel

Method used

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  • Direct current system line fault positioning method
  • Direct current system line fault positioning method
  • Direct current system line fault positioning method

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0053] For the VSC DC system, the present invention adopts the following steps to locate line faults:

[0054] The first step is to derive the voltage and current transient characteristic equations under different fault types on the line based on the VSC DC system, and derive the differential equation of the current transient characteristic equation, and obtain the initial value of the current differential equation when the fault occurs.

[0055] The first stage of the b...

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Abstract

The invention discloses a direct current system line fault positioning method. The method includes steps: firstly, deducing a voltage and current transient characteristic equation of lines with different fault types based on a VSC direct current system, and calculating a current differential initial value during the fault; performing fault discrimination by employing catastrophes of a positive electrode and a negative electrode in different fault types, and determining the fault type and the fault electrode after occurrence of the fault; then calculating a post-fault current and voltage characteristic equation, and calculating the transition resistance of a fault circuit; and finally deducing a fault positioning value by employing the current differential initial value during the fault, and realizing accuracy positioning of the line faults. According to the method, the fault positioning precision is high for a direct current system with high transition resistance and long distance, and the method can be applied to single-end radiation type direct current distribution networks, marine direct current distribution systems, and direct current systems whose transmission power is disperse, small, and random.

Description

technical field [0001] The invention relates to a fault location method for a direct current system line, belonging to the field of direct current line fault location. Background technique [0002] At present, the DC system fault location method is based on off-line technology, and the main methods are impedance method and traveling wave method. However, the impedance method is greatly affected by factors such as fault resistance, line load, transformer error and power supply parameters, and the actual application effect is not ideal. The traveling wave method is simple in principle and high in accuracy, so it is widely used in practice. The principle of the traveling wave method is to use the manual mode to detect the propagation time of the transient traveling wave on the fault line between the bus and the fault point to implement positioning. [0003] Traveling wave fault location relies on identifying the wave head and calibrating the initial time of the wave head to a...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 吴在军高仁栋范文超窦晓波胡敏强
Owner SOUTHEAST UNIV
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