Same-tower double-circuit direct current transmission line fault line selection method based on single pole information

A DC transmission line, double-circuit technology on the same tower, applied in the direction of the fault location, etc., can solve the sensitivity of protection, increase the identification of fault polar lines, different wave speeds, etc.

Active Publication Date: 2015-08-05
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, since the double-circuit DC transmission lines on the same tower do not perform transposition, the polarities and amplitudes of the line-mode and ground-mode traveling wave components coupled out when different polar lines are grounded are different on each polar line, and the wave velocity It is not the same, which greatly increases the difficulty of identifying faulty

Method used

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  • Same-tower double-circuit direct current transmission line fault line selection method based on single pole information
  • Same-tower double-circuit direct current transmission line fault line selection method based on single pole information
  • Same-tower double-circuit direct current transmission line fault line selection method based on single pole information

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Embodiment

[0060] Such as figure 1 and figure 2 As shown, a fault line selection combination method for double-circuit DC transmission lines on the same tower based on unipolar transient information includes the following steps:

[0061] (1) As shown in Figure 3(a) and Figure 3(b), the instantaneous value of the voltage at a certain moment before the current moment is taken as a reference quantity, and the four polar lines are obtained by subtracting the reference quantity from the instantaneous voltage value at the current moment the voltage change. The four polar lines are represented by 1P, 1N, 2P and 2N, 1P and 2N are on the upper floor of the same tower, and 1N and 2P are on the lower floor of the same tower. 1P and 1N are the positive and negative lines of the first circuit respectively, 2P and 2N are the positive and negative lines of the second circuit respectively, and the voltage variations of the four pole lines are respectively Δu 1P , Δu 1N , Δu 2P , Δu 2N . The calc...

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Abstract

The invention discloses a same-tower double-circuit direct current transmission line fault line selection method based on single pole information. The method includes the following steps: 1. voltage variations of four polar lines are calculated; 2. if the upper layer polar lines satisfy conditions, step 3 is carried out, and if the lower layer polar lines satisfy conditions, a step 4 is carried out; 3. If the low frequency harmonic wave amplitude satisfies a minimum value requirement, an amplitude ratio of low frequency and high frequency harmonic waves is continued to be obtained, if a specific value is larger than 1, the line of the pole is judged to be in fault, and otherwise travelling wave protection of the pole is locked; and 4. a voltage variation delay is sampled, if only one mutation wave head is detected in a data processing time window, the step 3 is carried out, if at least two mutation wave heads are detected in the data processing time window, polarity and amplitude relations of two continuous wave heads are compared, if the polarities are both positive and the amplitude relation satisfies a condition of a certain multiple, the line of the pole is judged to be in a non-near-end fault, and otherwise, travelling wave protection of the pole is locked. The same-tower double-circuit direct current transmission line fault line selection method based on single pole information has the advantages of high sensitivity, strong quick-action performance, difficult occurrence of misjudgment and the like.

Description

technical field [0001] The invention relates to a direct current transmission technology of a power system, in particular to a fault line selection method of a double-circuit direct current transmission line on the same tower based on unipolar information. Background technique [0002] The uneven distribution of natural energy in China and the asymmetric distribution of energy and population make HVDC transmission technology have broad application prospects in China. Compared with high-voltage AC transmission technology, high-voltage direct current transmission technology has the advantages of low unit cost, large transmission power, no need for synchronous operation of AC at both ends, and rapid control and adjustment. Therefore, the use of high-voltage direct current transmission technology is conducive to improving the economic and technical indicators of the power system , operational reliability and scheduling flexibility. [0003] In order to ensure the safe and relia...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 胡嘉滨李海锋麦国浩刘金平梁远升
Owner SOUTH CHINA UNIV OF TECH
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