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Ultra-high-speed protection method for DC transmission lines based on wavefront information

A DC transmission line, ultra-high-speed technology, applied in emergency protection circuit devices, electrical components, fault detection according to conductor type, etc., can solve sensitivity transition resistance, fault distance sampling frequency influence, high sampling rate requirements, mathematical theory defects, etc. problem, to achieve the effect without high sampling rate requirement

Active Publication Date: 2020-11-10
XI AN JIAOTONG UNIV +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the current protection principle using the fault traveling wave characteristic has high sampling rate requirements and mathematical theory defects; the protection principle using the fault traveling wave characteristic has the problem of lightning strike misoperation, and its sensitivity is affected by the transition resistance, fault distance, and sampling frequency. Impact

Method used

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  • Ultra-high-speed protection method for DC transmission lines based on wavefront information
  • Ultra-high-speed protection method for DC transmission lines based on wavefront information
  • Ultra-high-speed protection method for DC transmission lines based on wavefront information

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing:

[0038] The invention analyzes the frequency-varying characteristics of transmission line parameters, and obtains the line propagation coefficient and wave velocity characteristics taking into account the influence of each line parameter with frequency variation. figure 1 is the frequency characteristic of the unit length resistance, inductance and capacitance modulus of the transmission line; figure 2 is the transmission line propagation coefficient frequency characteristic; image 3 is the frequency characteristic of the transmission line wave velocity. It can be seen that signals of different frequencies propagate at different speeds on transmission lines, and their attenuation during propagation is also different. The difference between the parameters of the transmission line at low frequency and high frequency causes the difference in the propagation characteristics ...

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Abstract

The invention discloses an ultrahigh speed protection method for a direct current transmission line based on wavefront information. The method comprises the following steps: 1) measuring current at afront end protection installation site of the line, and calculating a current zero mode component; 2) identifying a rising edge portion of a traveling wave so as to start the protection to judge faults; and 3) after the protection is started, calculating fault sampling data, and judging the faults as intra-area faults and out-of-zone faults. According to the ultrahigh speed protection method disclosed by the invention, while the wavefront fault distance information is extracted, the resistance to transition resistance and the direction discrimination ability are high; and the ultrahigh speed protection method is fast, reliable, long in protection range and is free of high sampling rate requirement.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, in particular to an ultra-high-speed protection method for DC transmission lines based on wavefront information. Background technique [0002] DC transmission has the advantages of high transmission capacity, flexible power control and long-distance transmission. At present, conventional DC and flexible DC have been widely used in power system transmission. After a DC line fault occurs, the shorter the fault duration, the more conducive to the improvement of the transmission power of the transmission line and the enhancement of the transient stability of the power system. The Zhangbei Flexible DC Transmission puts forward a requirement of 3ms for the relay protection exit time. Instantaneous ultra-high-speed protection has become the focus of current research. [0003] Traveling wave protection has the characteristics of fast action. It mainly uses the traveling characte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085H02H7/265H02H7/268
Inventor 宋国兵张晨浩王莉樊占峰李佳朋
Owner XI AN JIAOTONG UNIV
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