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Traveling wave protection method and system forhigh-voltage transmission line based ontraveling wave waveform distance

A high-voltage transmission line, traveling wave protection technology, applied in the direction of information technology support system, emergency protection circuit device, electrical components, etc., can solve the problems of insufficient reliability of the criterion, sensitivity to noise, misoperation, etc., and achieve the advantages of reliable judgment, The effect of fast response speed and sufficient information

Active Publication Date: 2021-06-01
SHANDONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The protection method based on the traditional current differential protection principle has high reliability in judging the fault interval, but this method is easily affected by factors such as distributed capacitance and current transformer saturation, and needs to interact with a large number of current sampling values. Its rapidity sometimes fails to meet the requirements; the protection method based on the principle of traveling wave polarity comparison has a faster speed in judging faults, but this method is greatly affected by external interference and high-order harmonics, and it is easy to cause misoperation; The protection method based on the principle of amplitude comparison is relatively simple in the processing of traveling waves, without complicated calculations, but the setting of the threshold value is not easy to grasp; the protection principle based on the traveling wave discriminant directional protection relies on the differential calculation of the instantaneous value of voltage and current, This method is very sensitive to noise and can lead to situations where the criterion is not reliable enough

Method used

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  • Traveling wave protection method and system forhigh-voltage transmission line based ontraveling wave waveform distance
  • Traveling wave protection method and system forhigh-voltage transmission line based ontraveling wave waveform distance
  • Traveling wave protection method and system forhigh-voltage transmission line based ontraveling wave waveform distance

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Embodiment 1

[0033] In one or more embodiments, a traveling wave protection method for high voltage transmission lines based on traveling wave waveform distance is disclosed, the general idea is as follows:

[0034] Take the two ends of the protected line as the measurement point to obtain the corresponding instantaneous value of the three-phase voltage and current; calculate the transient value of the voltage and current of each phase according to the obtained instantaneous value of the voltage and current; through the phase-to-mode transformation, the calculated three-phase Phase voltage and current transient value are decoupled to obtain the modulus value of voltage and current, and then calculate the forward traveling wave and reverse traveling wave of each measurement point; use communication equipment to calculate the forward traveling wave waveform and The distance of the reverse traveling wave waveform on the opposite side is used to determine whether the fault point is inside the p...

Embodiment 2

[0116] In one or more embodiments, a high-voltage transmission line traveling wave protection system based on traveling wave waveform distance is disclosed, which includes two relay protection devices communicating with each other, and the relay protection devices are respectively installed on the protected line both ends; the relay protection device is configured to include:

[0117] The current and voltage acquisition module is used to obtain the instantaneous value of the three-phase voltage and current of each measurement point with the two ends of the protected line as the measurement points;

[0118] The voltage and current transient value calculation module is used to calculate the transient values ​​of the voltage and current of each phase according to the obtained instantaneous values ​​of voltage and current;

[0119] The phase-to-mode transformation module is used to decouple the calculated three-phase voltage and current transient values ​​through phase-to-mode tra...

Embodiment 3

[0126] This embodiment also provides a terminal device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are executed by Stored in the memory, when the electronic device is running, the processor executes one or more computer programs stored in the memory, so that the electronic device executes the method described in Embodiment 1 above.

[0127] It should be understood that in this embodiment, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic devices , discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or ...

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Abstract

The invention discloses a traveling wave protection method and system for a high-voltage transmission line based on a traveling wave waveform distance. The method comprises the steps pf taking two ends of a protected line as measurement points, and obtaining three-phase voltage and current instantaneous values of each measurement point; according to the obtained instantaneous values of the voltage and the current, calculating transient values of the voltage and the current of each phase; decoupling the calculated transient values of the three-phase voltage and the current through phase-mode transformation to obtain mode component values of the voltage and the current, and further calculating forward traveling waves and reverse traveling waves of each measurement point; obtaining traveling wave information of an opposite side measurement point by using communication equipment, calculating the distance between a current side forward traveling wave waveform and an opposite side reverse traveling wave waveform, determining whether a fault point is located in a protection line or not, and if so, executing trip protection; otherwise, not needing tripping. According to the invention, traveling wave protection has a faster response speed and is not influenced by system oscillation, distributed capacitance and current transformer saturation factors.

Description

technical field [0001] The invention relates to the technical field of high-voltage transmission line protection, in particular to a traveling-wave protection method and system for high-voltage transmission lines based on traveling-wave waveform distance. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to the large transmission capacity and high voltage level of high-voltage transmission lines, the short-circuit current is very large when a short-circuit fault occurs, which has a great impact on the safety of transmission equipment and the stability of power grid operation. The high-voltage power transmission system has higher requirements on the speed of relay protection, and the traditional protection principle based on power frequency is difficult to meet the requirements. Compared with traditional relay protection, traveling wave ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/265Y04S10/52
Inventor 丛伟孔昊邱吉福杨天佑李志泰魏振陈明时翔史蕾玚孙振海张弘喆孙守晶
Owner SHANDONG UNIV
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