Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation

A technology of UHV DC and DC lines, applied in AC network circuits, measuring current/voltage, measuring only voltage, etc.

Active Publication Date: 2016-05-04
CSG EHV POWER TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all DC transmission systems in the world lack timely and effective monitoring methods for DC line voltage.

Method used

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  • Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation
  • Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation
  • Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation

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Embodiment Construction

[0028] A method for monitoring DC line voltage fluctuations of an UHVDC transmission system according to the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] The following is a best example of a monitoring method for DC line voltage fluctuations of UHVDC power transmission system according to the present invention, which does not limit the scope of protection of the present invention.

[0030] figure 1 It shows a method for monitoring DC line voltage fluctuations in UHVDC transmission systems of the present invention, including the following steps:

[0031] S1, according to the actual situation of the project, is the DC line resistance R dc1 set an upper limit R max and the lower limit R min ;

[0032] S2. Measure the DC line voltage in real time through the DC voltage divider, and monitor whether the single secondary voltage divider of the DC voltage divider is abnormal;

[0033] S3, monitor the DC ...

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PUM

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Abstract

The invention relates to a method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation, comprising steps of setting an upper limit value and a lower limit value for a DC line resistor according to a practical construction condition, performing real-time measurement on the DC line voltage through a DC voltage divider and monitoring whether a secondary voltage dividing plate of the DC voltage divider is normal, monitoring the resistor of the DC line, generating a HIGH WARNING alarm signal when the DC line resistance exceeds the upper limit value, generating a LOW WARNING alarm signal when the DC line resistance exceeds the lower limit value, adding a TDM bus data analysis module on the DC voltage divider for analyzing the data of two sets of the TDM measurement buses, obtaining a absolute value after subtracting the DC line voltage of two sets of the measurement systems , converting the absolute value to a per unit value which is compared with a set value, and emitting an EXCEED WARNING alarm signal when the set value is exceeded. The method disclosed by the invention can perform sensitive, rapid and comprehensive monitoring on the line voltage fluctuation of the HVDC power transmission system, can promptly perform early warning and prevents the expansion of the fault range caused by abnormal voltage fluctuation.

Description

technical field [0001] The invention relates to the field of ultra-high voltage direct current transmission, and more specifically relates to a monitoring method for voltage fluctuation of a direct current line in an ultra-high voltage direct current transmission system. Background technique [0002] Compared with the traditional AC transmission technology, the UHVDC transmission has the advantages of strong line transmission capacity, low loss, no need for synchronous operation of the AC systems on both sides, and small loss to the power grid when a fault occurs. It is especially suitable for long-distance point-to-point transmission. power transmission. [0003] For example, the Yunguang and Nuozhadu DC transmission projects are ±800kV UHV DC transmission systems of China Southern Power Grid, and their DC control and protection systems and DC measurement system secondary equipment are all based on TDC hardware platforms. However, DC lines are prone to abnormal voltage flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H02J13/00H02J3/36
CPCH02J3/36G01R19/0084H02J2003/365H02J13/00019Y02E60/60Y04S40/124Y02E60/00
Inventor 杨学广沈龙余海翔谢超梁秉岗梁家豪
Owner CSG EHV POWER TRANSMISSION
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