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High-voltage direct-current transmission line low-voltage protective method

A low-voltage protection and transmission line technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as poor performance and lack of setting principles for DC low-voltage protection, and achieve the effect of fast action speed and good reliability.

Active Publication Date: 2011-08-31
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current DC low-voltage protection lacks setting principles, poor performance, and fails to perform the role of backup protection well.

Method used

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  • High-voltage direct-current transmission line low-voltage protective method
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  • High-voltage direct-current transmission line low-voltage protective method

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] The DC transmission system consists of three parts: rectifier station, inverter station and DC transmission line, such as figure 1 shown. The rectifier station converts AC to DC, and the transmission line transmits the DC power to the opposite inverter station, which converts DC to AC. The core content of the invention is to provide low voltage protection for direct current transmission lines.

[0030] The low-voltage protection principle proposed by the invention is based on the distribution parameter model of the transmission line, and is suitable for long lines. In order to realize the protection principle, firstly, on the Beryllon model of the transmission line, the instantaneous value of the DC voltage at the end of the protection range is calculated through the measured values ​​of the DC voltage and DC current at the protection installation si...

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Abstract

The invention provides a direct-current transmission line low-voltage protective method built on the basis of a time domain distributed parameter model. The voltage value in the end of a protective range is obtained by utilizing a time domain calculating method of a line voltage according to the voltage and current measured values at a protection installation position, and a protection criterion is constructed by utilizing the voltage calculated value of the protective range end. When a line end voltage calculated value and the voltage calculated value at the protection installation position have opposite signs, a metallicity or low-transition resistor fault happens in a power transmission line area is judged, so that quick protection action is carried out; and when the line end calculated voltage amplitude is less than a set value, a high-transition resistor fault or an outside fault happens in the power transmission line area is judged, and selectivity is provided when in related protection coordination, so that at the moment, protection action can be realized after time is delayed. The method is realized in a time domain, so that a needed data window is short and calculating amount is low. The method is mainly used for the relay protection of the direct-current transmission line in an electrical power system.

Description

technical field [0001] The invention belongs to the field of relay protection for power system transmission lines, and relates to a low-voltage protection method for direct current transmission lines, in particular to a low-voltage protection method for high-voltage direct current transmission lines. Background technique [0002] With the rapid development of my country's national economy, the demand for electricity is increasing. HVDC transmission has advantages in long-distance, large-capacity power transmission and asynchronous system interconnection. In recent years, HVDC transmission has developed rapidly in my country and has become the focus of my country's electric power construction. At present, the number of direct current transmission projects in my country ranks among the best in the world. [0003] As the connection line of the large-scale power grid, the high-voltage direct current transmission line will affect the stable operation of the interconnected grid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 宋国兵饶菁高淑萍张健康索南加乐
Owner XI AN JIAOTONG UNIV
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