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Direct-current circuit time domain fault distance measuring method based on continuous data window

A time-domain fault and DC line technology, applied in the direction of fault location, etc., can solve problems such as obvious frequency-dependent characteristics, influence on reliability and accuracy of fault location results, failure to guarantee reliability and accuracy of fault location results, etc.

Inactive Publication Date: 2015-07-01
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, the fault analysis method needs to calculate accurate line parameters. When the line parameters are inaccurate or the frequency-dependent characteristics of the line are obvious, the reliability and accuracy of the fault location results will be affected.
Due to the obvious frequency-dependent characteristics of the DC transmission system, and the existing time-domain fault analysis methods are based on the Berry Dragon parameter model and use a fixed data window for calculation, the reliability and accuracy of the fault location results cannot be guaranteed.

Method used

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  • Direct-current circuit time domain fault distance measuring method based on continuous data window
  • Direct-current circuit time domain fault distance measuring method based on continuous data window
  • Direct-current circuit time domain fault distance measuring method based on continuous data window

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Embodiment

[0046] Use PSCAD / EMTDC simulation software to construct the Yunnan-Guangdong ±800kV bipolar DC transmission system model, such as figure 1 As shown; the bipolar DC transmission line model adopts the Frequency Dependent Model (Frequency Dependent Model), and the total length of the line is 1374km. The tower structure diagram of the transmission system is as follows figure 2 shown. Set unipolar faults to occur in different locations, fault transition resistance includes metallic grounding and grounding through 100Ω, 300Ω, 500Ω transition resistance. Take a period of time after the failure T as 6ms, data sampling frequency f as 100kHz, take a redundant data window Δt every 0.2ms as 3ms, and set D as 5km. The system applies a DC line time-domain fault location method based on continuous data windows of the present invention, comprising the following steps:

[0047] S1. Construct phase mode transformation matrix:

[0048] S ...

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Abstract

The invention discloses a direct-current circuit time domain fault distance measuring method based on a continuous data window. The method includes 1, constructing transmission line decoupling matrix; 2, according to the transmission line decoupling matrix, performing decoupling transform on the voltage and current measured from two ends of a circuit; 3, calculating the line voltage distribution of two ends of the circuit; 4, constructing the fault location criterion based on the continuous data window. The method has the advantages that the fault transient accuracy is utilized fully, the positioning accuracy and reliability are high, the calculation complexity is low, and implementation is easy.

Description

technical field [0001] The invention relates to a fault location method for direct current transmission lines, in particular to a time-domain fault location method for direct current lines based on continuous data windows. Background technique [0002] With the development of power electronics technology, computer technology and control technology, DC transmission technology is becoming more and more mature. The difference in the distribution of energy resources and load demand centers in China determines that DC transmission technology has a wide range of applications in my country. Compared with AC transmission technology, DC transmission technology has the characteristics of long transmission distance, large transmission power capacity, and flexible and rapid control. The Zhoushan DC project marks the completion of my country's first DC project. In recent years, my country has further accelerated the development of HVDC / UHVDC transmission projects, and a large number of ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 丘映丹李海锋蔡颖倩刘金平梁远升
Owner SOUTH CHINA UNIV OF TECH
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