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Rapid pilot protection method and system for high-voltage direct-current line

A technology of longitudinal protection and high-voltage direct current, applied in emergency protection circuit devices, emergency protection data processing devices, emergency protection devices with automatic disconnection, etc., can solve the problem of insufficient quickness of longitudinal protection and strict synchronization of double-ended data and other problems, to achieve the effects of saving fault identification time, quickly identifying faults, strong transition resistance capability and anti-noise interference ability

Active Publication Date: 2021-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of insufficient quickness of the existing longitudinal protection and strict synchronization of double-ended data, the present invention provides a fast longitudinal protection method for high-voltage DC lines

Method used

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  • Rapid pilot protection method and system for high-voltage direct-current line
  • Rapid pilot protection method and system for high-voltage direct-current line
  • Rapid pilot protection method and system for high-voltage direct-current line

Examples

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Effect test

Embodiment 1

[0048] A high-voltage direct current transmission system based on a fast longitudinal protection method for high-voltage direct current lines such as figure 1 shown. figure 1 A typical HVDC system is shown along with fault points closely related to HVDC line protection (only the positive line is shown due to bipolar symmetry). Among them: MMC1 station is used as a rectifier station, and MMC2 station is used as an inverter station. figure 1Among them, the current-limiting reactor is used as the boundary element between the converter station and the line; F_in1, F_in2, and F_in3 are the fault points in the DC line; F_out1 and F_out2 are the fault points outside the valve side of the boundary element. Generally, protection measuring points M are installed at the beginning and end of the line respectively. 1 , M 2 , to detect a DC fault and initiate the fault clearing process.

[0049] A method for fast longitudinal protection of a high-voltage direct current line specifically...

Embodiment 2

[0095] This embodiment provides a high-voltage DC line fast longitudinal protection system, including:

[0096] The starting unit starts the protection when the criterion is met.

[0097] The component calculation module uses the pole-line voltage and pole-line current measured by the protection measuring point to calculate the convolution power sequence, and calculates the average value of the convolution power. After the communication between the measuring points is completed, the average value of the convolution power on both sides of the line is calculated. Difference.

[0098] The fault identification and fault pole selection unit in the zone uses the average difference of the convolution power on both sides of the line to identify faults in the zone and perform fault pole selection.

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Abstract

The invention belongs to the field of high-voltage direct-current line protection, and relates to a high-voltage direct-current line rapid pilot protection method, which comprises the following steps of: polar line voltage and polar line current are measured by using measuring points at the head end and the tail end of a line; preliminary judgment is carried out in the starting unit, and protection starting is carried out when a starting criterion is met; a convolution power sequence is carried out by using the polar line voltage and the polar line current, and an average value of the convolution power sequence is calculated; the measuring point transmits the calculated convolution power average value to the measuring point on the opposite side of the line; the difference between the convolution power average values on the two sides of the line is calculated; in the intra-region fault identification and fault pole selection unit, intra-region faults are identified by using the difference of convolution power average values, and fault pole selection is carried out; and in the protection unit, corresponding protection action is performed according to the processing result of the internal fault identification and fault pole selection unit. According to the method, the defects that an existing pilot protection method is not high in speed and double-end data needs to be strictly synchronized are overcome. The invention further provides a high-voltage direct-current line rapid pilot protection system.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current line protection, and relates to a method and system for fast longitudinal protection of high-voltage direct current lines. Background technique [0002] DC transmission technology has large transmission capacity, low energy loss, and low engineering cost. It does not have the inherent stability problems of AC transmission, and the transmission distance and power are not limited by the stability of the synchronous operation of the power system. With various advantages, DC transmission technology has been used in It is widely used in power network. The DC overhead line fault is the highest fault probability in the DC system, so the fault protection of the DC line is a problem that needs special attention in the field of DC transmission. In the fault protection of DC lines, traveling wave protection is often used as the main protection, and current differential protection is used as the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/28H02H1/00
CPCH02H7/268H02H7/261H02H3/28H02H1/0092
Inventor 李海锋褚倍钰蒋慧敏梁远升王钢
Owner SOUTH CHINA UNIV OF TECH
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