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High-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy

A wavelet energy, transmission line technology, applied in emergency protection circuit devices, electrical components, emergency protection detection and other directions, can solve the problems of insignificant current changes, easy refusal to move, low recognition rate, etc.

Active Publication Date: 2016-05-18
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the HVDC transmission line protection method based on the specific frequency component of single-ended current uses the current measured on the DC line side. Compared with the large load current in the DC line during normal operation, the current change before and after the fault is not obvious, and the transition resistance The resistance ability is poor, and the protection is easy to refuse to operate (low recognition rate); and the method of judging internal and external faults by calculating the energy difference of high electrical quantity and low frequency signal is also due to the attenuation of high frequency quantity of fault transient signal by HVDC transmission line function, it will also lead to low recognition rate and easy rejection

Method used

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  • High-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy
  • High-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy
  • High-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy

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Embodiment

[0046] A specific embodiment of the present invention is a method for single-ended protection of HVDC transmission lines based on relative entropy of wavelet energy, the steps of which are as follows:

[0047] A. Data collection and preprocessing

[0048] The current measuring device collects the inner positive line current i on the inner side of the line boundary ap (n), inner negative line current i an (n), the data processing device uses the orthogonal transformation matrix to analyze the inner positive pole line current i ap (n), inner negative line current i an (n) Perform phase-mode conversion to obtain the inner 1-mode current x of the line boundary a (n);

[0049] The current measuring device collects the outer positive line current i outside the line boundary bp (n), the outer negative line current i bn (n); the data processing device utilizes the orthogonal transformation matrix to the outer positive pole line current i bp (n), the outer negative line current ...

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Abstract

A high-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy mainly comprises the steps of 1), performing data acquisition and preprocessing, acquiring a current signal by a current measuring device, performing phase-model transformation by a protective data processing device by means of an orthogonal transformation matrix, and obtaining the inside 1-mode current xa(n) of a line boundary and the outside 1-mode current xb(n) of the line boundary; 2) calculating the wavelet energy relative entropy, namely performing wavelet transformation on the inside 1-mode current Xa and the outside 1-mode current Xb, and calculating the wavelet energy relative entropy M between the inside 1-mode current vector Xa and the outside 1-mode current vector Xb; and 3), performing high-voltage DC power transmission line single-end protection, namely determining whether the wavelet energy relative entropy M is larger than a preset protecting threshold epsilon, if M is larger than the epsilon, determining a fact that the fault occurs in the high-voltage DC power transmission line area by a protecting device. The high-voltage DC power transmission line single-end protecting method has advantages of high identification rate for line faults, more accurate and reliable protection action, and higher capability of ensuring safe and stable operation of the power transmission line.

Description

technical field [0001] The invention relates to a single-end protection method for a high-voltage direct current transmission line in a power system. Background technique [0002] With the development of power electronics technology, HVDC transmission is widely used in long-distance, large-capacity power transmission and power system networking due to its advantages of strong power transmission capacity, low power loss, and no synchronization problems. Due to the long distance of HVDC transmission corridors and complex environmental conditions, the line failure rate is relatively high. When a fault occurs, it is necessary to make a timely judgment on the fault and cut off the line to ensure the safe and stable operation of the transmission line. [0003] Existing protection methods for HVDC transmission lines are divided into two types: double-ended protection and single-ended protection. Double-ended protection utilizes the electrical quantity at both ends of the HVDC tran...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H1/0007H02H7/226H02H7/26H02H7/267H02H7/268
Inventor 林圣高杉
Owner SOUTHWEST JIAOTONG UNIV
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