Extra-high voltage DC power transmission line single-end distance measuring method using modulus maximum value ratio

A technology of UHVDC and modulus-to-maximum ratio, applied in information technology support systems, fault locations, etc., can solve the problems of slow data processing response, low fitting degree, low accuracy, etc., and achieve fast convergence speed, measurement The effect of high pitch accuracy and strong ability to withstand transition resistance

Active Publication Date: 2016-01-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is: the present invention provides a single-end ranging method for UHV DC transmission lines using the modulus-to-maximum ratio, which is used to solve the inconvenient measurement of the double-end method in the traveling wave fault location method. The reliability of the single-ended method is not high

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  • Extra-high voltage DC power transmission line single-end distance measuring method using modulus maximum value ratio
  • Extra-high voltage DC power transmission line single-end distance measuring method using modulus maximum value ratio
  • Extra-high voltage DC power transmission line single-end distance measuring method using modulus maximum value ratio

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Embodiment 1

[0042] Embodiment 1: as Figure 1-5 As shown, the specific steps of a single-ended ranging method for UHV DC transmission lines using the modulus-to-maximum ratio are as follows:

[0043] A. After a ground fault occurs on the UHV DC transmission line, the data acquisition devices on the rectification side of the positive line and the negative line respectively collect the fault voltage u within the 5ms time window after the fault + , u - ;

[0044] B. For different transition resistances and different fault distances, respectively compare the fault voltage u collected on the positive line and the negative line + , u - Perform decoupling transformation to obtain independent transient voltage line mode component u 1 with the zero-mode component u 0 ;

[0045] C, respectively for u 1 , u 0 Perform wavelet decomposition to obtain the first wave head amplitude U of the linear mode component of the transient voltage at the first, second, third and fourth scale 11 , U 21 , ...

Embodiment 2

[0049] Embodiment 2: as Figure 1-5 As shown, the specific steps of a single-ended ranging method for UHV DC transmission lines using the modulus-to-maximum ratio are as follows:

[0050] A. After a ground fault occurs on the UHV DC transmission line, the data acquisition devices on the rectification side of the positive line and the negative line respectively collect the fault voltage u within the 5ms time window after the fault + , u - ;

[0051] B. For different transition resistances and different fault distances, respectively compare the fault voltage u collected on the positive line and the negative line + , u - Perform decoupling transformation to obtain independent transient voltage line mode component u 1 with the zero-mode component u 0 ;

[0052] C, respectively for u 1 , u 0 Perform wavelet decomposition to obtain the first wave head amplitude U of the linear mode component of the transient voltage at the first, second, third and fourth scale 11 , U 21 , ...

Embodiment 3

[0057] Embodiment 3: as Figure 1-5 As shown, the specific steps of a single-ended ranging method for UHV DC transmission lines using the modulus-to-maximum ratio are as follows:

[0058] A. After a ground fault occurs on the UHV DC transmission line, the data acquisition devices on the rectification side of the positive line and the negative line respectively collect the fault voltage u within the 5ms time window after the fault + , u - ;

[0059] B. For different transition resistances and different fault distances, respectively compare the fault voltage u collected on the positive line and the negative line + , u - Perform decoupling transformation to obtain independent transient voltage line mode component u 1 with the zero-mode component u 0 ;

[0060] C, respectively for u 1 , u 0 Perform wavelet decomposition to obtain the first wave head amplitude U of the linear mode component of the transient voltage at the first, second, third and fourth scale 11 , U 21 , ...

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Abstract

The invention relates to an extra-high voltage DC power transmission line single-end distance measuring method using a modulus maximum value ratio, and belongs to the technical field of relay protection of a high voltage DC power transmission system. The method comprises the following steps: acquiring fault voltages u<+> and u<-> of a positive line and a negative line after a fault, performing decoupling transformation on the fault voltages under different transition resistance and fault distances to obtain u1 and u0, carrying wavelet decomposition on u1 and u0 in terms of four dimensions to obtain first wave head amplitude of a line-mode component and a zero-mode component, calculating a ratio of a first wave head amplitude maximum value of the line-mode component to the first wave head amplitude maximum value of the zero-mode component under the same dimension and taking the ratio as a nerve network input quantity, training a nerve network by use of an input sample set and an output sample set (a fault distance arranged in simulation), and obtaining a fault distance measuring result by use of a test sample. According to the invention, as it is shown through simulation that the extra-high voltage DC power transmission line single-end distance measuring method using the modulus maximum value ratio is quite high in precision.

Description

technical field [0001] The invention relates to a single-end ranging method of an ultra-high voltage direct current transmission line by using the modulus-maximum ratio, and belongs to the technical field of relay protection of a high-voltage direct current transmission system. Background technique [0002] At present, the fault location of UHVDC transmission lines mainly relies on traveling wave fault location technology. Traveling wave fault location is divided into single-ended method and double-ended method. Double-ended traveling wave ranging is difficult to realize due to the need for data communication equipment at both ends and simultaneous sampling at both ends. Compared with double-ended traveling wave ranging, single-ended Traveling wave ranging has become an important research direction in the field of fault location because of its advantages of low cost and strong real-time performance. The key to traditional single-ended traveling wave ranging lies in the accu...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 陈仕龙李建平谢佳伟毕贵红黄钰琪罗璐王燕武
Owner KUNMING UNIV OF SCI & TECH
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