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High voltage direct current power transmission line protection method based on voltage and current mutation direction

A technology of DC transmission lines and transmission lines, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high sampling frequency, communication channels and hardware requirements, and does not discuss multiple operating modes of DC transmission systems

Inactive Publication Date: 2012-12-12
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above protection methods solve some defects of the existing DC transmission line protection to a certain extent, but do not discuss whether it can be used in various operating modes of the DC transmission system, and some protection methods have higher requirements on sampling frequency, communication channels and hardware

Method used

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  • High voltage direct current power transmission line protection method based on voltage and current mutation direction
  • High voltage direct current power transmission line protection method based on voltage and current mutation direction
  • High voltage direct current power transmission line protection method based on voltage and current mutation direction

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawing.

[0045] Such as figure 1 Shown is the structure diagram of the applicable bipolar direct current transmission system of the present invention, and the implementation steps of the protection method are as follows:

[0046] Step 1: Analyze the direction characteristics of voltage and current mutations at the installation place of DC transmission line protection:

[0047]At the moment of failure, that is, in the transient process where the control system does not start or the control system starts to adjust but has not yet adjusted to a steady state:

[0048] 1) When an internal fault occurs on the positive or negative line, the direction of the voltage mutation at the protection measurement point on the rectifier side of the line is opposite to the direction of the current mutation, and the directions of the two on the inverter side are the same.

[0049] 2) When a pole-to-p...

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Abstract

The invention discloses a high voltage direct current power transmission line protection method based on a voltage and current mutation direction. The method comprises the following steps that when a fault exists in a line area, the directions of the voltage mutation quantity and the current mutation quantity at the protection measurement of a rectifying side are opposite, and the directions of the voltage mutation quantity and the current mutation quantity at an inverter side are the same; the feature is also applicable for anode lines and cathode lines; and faults at other areas do not satisfy the condition. Thus, the protection criterion of the high voltage direct current transmission line is structured and the protection method is disclosed. As the method provided by the invention is adopted in the protection of the direct current transmission line, actions can be performed fast and accurately when fault lightning, high impedance earthing faults and pole-pole faults exist in the line area; no error action is carried out under the situations of lightning disturbance, faults outside the line protection area and the like; the protection method is simple and clear; the requirement on communication channels is not high; the requirements on data calculating speed and sampling frequency are low; no synchronizing processing is required for sampled data; and various operation ways of a bipolar direct current power transmission system are applicable, and the practical value is high.

Description

technical field [0001] The invention relates to a power system relay protection method, in particular to a high-voltage direct current transmission line protection method based on voltage and current mutation directions. Background technique [0002] The DC transmission project has long lines, complex terrain, and high failure rate, so the protection of DC transmission lines plays an important role. The existing DC transmission line protection methods mainly include traveling wave protection, low voltage protection and differential protection. Traveling wave protection operates quickly, but is easily affected by interference, and its reliability is greatly affected by the wave head detection results. Undervoltage protection may refuse to operate when a high-resistance ground fault occurs inside the line. The current differential protection is easily affected by the fault transient state and the load adjustment process, and cannot realize quick action, and its reliability i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 陈青邢鲁华高湛军
Owner SHANDONG UNIV
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