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Method for realizing traveling wave protection of ultra-high-voltage direct-current power transmission line

A technology of UHV DC and transmission lines, applied in the direction of emergency protection circuit devices, electrical components, etc., which can solve the problems of reliability, quickness, accuracy and anti-interference ability, and the inability to accurately grasp the transient information of line faults, Problems such as the inability to effectively realize the traveling wave protection of UHV DC transmission lines, and achieve the effects of traveling wave protection, anti-interference and strong reliability

Inactive Publication Date: 2015-01-28
CHINA EPRI ELECTRIC POWER ENG CO LTD +3
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Problems solved by technology

The Fourier transform cannot be analyzed locally, so it cannot accurately grasp the transient information of the line fault, so the reliability, quickness, accuracy and anti-interference ability of its action are greatly affected, and it cannot effectively realize the special Traveling Wave Protection for HVDC Transmission Lines

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  • Method for realizing traveling wave protection of ultra-high-voltage direct-current power transmission line

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Embodiment Construction

[0015] The present invention is described in further detail below in conjunction with accompanying drawing:

[0016] refer to figure 1 , the realization method of the DC transmission line traveling wave protection of the present invention comprises the following steps:

[0017] 1) Collect the instantaneous voltage u(t) and instantaneous current i(t) of the UHVDC transmission line in real time to obtain the pole wave P of the UHVDC transmission line I (t), where P I (t)=Z p i(t)-u(t), Z P is the polar wave impedance, and then through the Gabor transformation to the polar wave P I (t) Perform time-frequency analysis to obtain the modulus A of the S transformation matrix set , and then draw the three-dimensional time-frequency distribution diagram of the modulus of the S transformation matrix;

[0018] 2) When A set rel .A min , then protect the exit action, where, K rel is the reliability factor, A(t, f) is the modulus value in the Gabor transformation matrix, f is th...

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Abstract

The invention discloses a method for realizing traveling wave protection of an ultra-high-voltage direct-current power transmission line. The method comprises the following steps: (1) the instantaneous voltage u(t) and instantaneous current i(t) of an ultra-high-voltage direct-current power transmission line are acquired in real time to obtain the polar wave PI(t) of the ultra-high-voltage direct-current power transmission line, wherein PI(t)=Zp*i(t)-u(t), and Zp refers to polar wave impedance, time-frequency analysis is made on the polar wave PI(t) through Gabor transform to obtain the modulus value Aset of an S transform matrix, and the three-dimensional time-frequency distribution map of the S transform matrix is drawn; and (2) when Aset<Krel*Amin, a protection outlet acts, wherein Krel is reliability coefficient, Amin=Min(A<Sigma>(t)), A<Sigma>(t)=(Sigma<f=0><fs12>A(t,f)), A(t,f) is the modulus value in a Gabor transform matrix, f is frequency, t is time, fs is sampling frequency, and Amin is the minimum value of external fault and disturbance noise. By adopting the method, transient information of a line fault can be accurately grasped so as to realize traveling wave protection of an ultra-high-voltage direct-current power transmission line.

Description

technical field [0001] The invention belongs to the field of UHV direct current transmission, and relates to a method for realizing traveling wave protection, in particular to a method for realizing traveling wave protection for UHV direct current transmission lines. Background technique [0002] High-voltage direct current transmission (HVDC) plays an increasingly important role in long-distance and high-power transmission because of its advantages such as large transmission power, low line cost, and good control performance. Primary means of asynchronous networking. At present, more than ten HVDC transmission projects have been put into operation in China. Therefore, ensuring the safe and stable operation of DC transmission lines and providing a high-speed and reliable line protection scheme has become an urgent problem in DC transmission technology to be solved. [0003] Because traveling wave protection has ultra-high-speed action performance and can overcome the disad...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 刘杰宁联辉王秀丽邹蕴韬
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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