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Ultrahigh-voltage DC line protection method based on specific frequency band current

A UHV DC and frequency band technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of low sampling rate, and achieve the effect of easy hardware implementation, fast and accurate identification, and low sampling rate requirements

Active Publication Date: 2018-07-24
SHANGHAI JIAO TONG UNIV
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  • Claims
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Problems solved by technology

[0003] The present invention aims at defects such as high-resistance faults and out-of-area faults at the end of the zone that are difficult to distinguish in the prior art, and proposes a UHV DC line protection method based on current in a specific frequency band, using the single-end specific frequency band on the rectifier side of the UHV DC transmission line Current for fault discrimination, low sampling rate, no need for data synchronization, and clear setting basis

Method used

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  • Ultrahigh-voltage DC line protection method based on specific frequency band current
  • Ultrahigh-voltage DC line protection method based on specific frequency band current
  • Ultrahigh-voltage DC line protection method based on specific frequency band current

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Embodiment Construction

[0017] Such as figure 1 As shown, it is a schematic diagram of the realization system of current protection in a specific frequency band of ±800kV UHV DC line. Point m in the figure indicates the position of the protection installation on the rectification side, and point M indicates the valve side position of the smoothing reactor on the rectification side.

[0018] Such as figure 2 As shown, the operation steps of this embodiment are as follows:

[0019] Step 1. Collect the real-time current at the rectification side protection installation of the UHVDC transmission system and the valve side of the rectification side smoothing reactor.

[0020] Step 2. Calculate the value of the fault current at the rectification side protection installation place and the rectification side smoothing reactor valve side.

[0021] The fault current is the difference between the real-time current and the steady-state current when the UHVDC system is in normal operation.

[0022] Step 3. Use...

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Abstract

The invention relates to an ultrahigh-voltage DC line protection method based on specific frequency band current, which comprises the steps of firstly extracting real-time current values measured by current dividers at a rectification-side protection installation part and a rectification-side smoothing reactor valve side; calculating fault current of the protection installation part and the smoothing reactor valve side, namely, the difference between the real-time current and steady-state current of an ultrahigh-voltage DC system in normal operation; extracting a specific frequency band current component of the fault current by a filter; performing comparative judgment on a specific frequency band current effective value at the rectification-side protection installation part, a specific frequency band current effective value at the rectification-side smoothing reactor valve side and a protection threshold to obtain whether the DC line has a fault or not; and then obtaining the type ofthe fault. According to the invention, fault judgment is performed by only using the single-end specific frequency band current, data synchronization is not required to be performed, requirements forthe sampling rate is low, and various DC line faults can be recognized quickly and accurately.

Description

technical field [0001] The present invention relates to a technology in the field of UHV DC power transmission system, in particular to a UHV DC line protection method based on current in a specific frequency band. Background technique [0002] At present, the line protection of UHV DC transmission projects can be divided into main protection and backup protection. The main protection is generally configured as traveling wave protection and differential undervoltage protection, and the backup protection is configured as longitudinal current differential protection. Traveling wave protection requires high sampling rate of the device, difficult detection of traveling wave head, susceptible to noise interference, and poor resistance to transition resistance; differential undervoltage protection is not only the main protection of UHV DC transmission lines, but also double as traveling wave protection of DC lines However, studies have shown that when a 1000km DC transmission line...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 杨亚宇邰能灵范春菊郑晓冬黄文焘
Owner SHANGHAI JIAO TONG UNIV
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