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A Monitoring Method for DC Line Voltage Fluctuation in UHVDC Transmission System

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

Active Publication Date: 2019-02-26
CSG EHV POWER TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A Monitoring Method for DC Line Voltage Fluctuation in UHVDC Transmission System
  • A Monitoring Method for DC Line Voltage Fluctuation in UHVDC Transmission System
  • A Monitoring Method for DC Line Voltage Fluctuation in UHVDC Transmission System

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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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Abstract

The invention relates to a method for monitoring voltage fluctuations of DC lines in UHVDC transmission systems, comprising the following steps: S1, setting an upper limit value and a lower limit value for the resistance of the DC line according to actual engineering conditions; S2, using a DC voltage divider Measure the DC line voltage in real time, and monitor whether the secondary voltage divider of the DC voltage divider is abnormal; S3, monitor the DC line resistance, and send a HIGH WARNING alarm signal when it exceeds the upper limit, and send a HIGH WARNING alarm signal when it exceeds the lower limit Send a LOW WARNING alarm signal; the DC voltage divider is equipped with a TDM bus data analysis module, which always analyzes the data of two sets of TDM measurement buses, and takes the absolute value after the difference of the DC line voltage of the two measurement systems, and converts it into a standard value. Unitary value, compared with a set value, when the set value is exceeded, an EXCEED WARNING alarm signal will be sent. The method of the invention conducts sensitive, fast and comprehensive monitoring of line voltage fluctuations of the high-voltage direct current transmission system, timely early warning, and prevents fault range expansion caused by abnormal voltage fluctuations.

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 Patents(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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