Flexible DC power transmission overhead line fault rapid determining method without setting threshold

A technology of flexible direct current transmission and overhead lines, which is applied to fault locations, emergency protection circuit devices, electrical components, etc., can solve the problems of fault detection and identification, and restrict the development of flexible direct current transmission networks, so as to achieve high reliability and prevent errors The effect of judging and improving accuracy

Inactive Publication Date: 2017-03-15
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the problem of isolation and removal of DC short-circuit faults still needs to be solved urgently, and the high-voltage DC circuit breaker with fast breaking short-circuit current restricts the development of flexible DC transmission

Method used

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  • Flexible DC power transmission overhead line fault rapid determining method without setting threshold
  • Flexible DC power transmission overhead line fault rapid determining method without setting threshold
  • Flexible DC power transmission overhead line fault rapid determining method without setting threshold

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Embodiment Construction

[0030] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0031] Each transient signal after a fault in the flexible DC transmission system contains rich information such as fault type and cut-off, among which the mutation point usually contains the most essential information in the signal. The wavelet transform can characterize the singularity of the signal, and the Lipschitz exponents of the signal on different scales are used to represent the abrupt feature of the signal. Mathematically, the Lipschitz index is a measure of the local characteristics of the function, which gives precise information on the conductivity of the signal at a certain moment. The larger the Lipschitz index, the more regular the signal, and the smaller the Lipschitz index, the signal is at this moment. The sharper it is, the singularity of the signal is characterized as a positive singularity and the noise as a negativ...

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Abstract

The invention relates to a flexible DC power transmission overhead line fault rapid determining method without setting a threshold. The method is characterized in that single-end travelling wave signals which are rapidly spread in a power transmission line during a fault are employed as original data for fault determination, the rapidness and the economic benefits are excellent; and mold maximum change conditions after single-end transient voltage travelling wave signals and single-end transient current travelling wave signals are subjected to wavelet multiple dimensioned analysis are taken as a criterion for determining whether a system generates a fault and whether the fault is a zone inside fault or a zone outside fault, and at the same time, amplitude of forward traveling waves and backward travelling waves of the single-end transient voltage travelling wave signals is taken as a fault direction criterion. The method is simple in principle, is effective, is easy to implement, does not require setting and arranging a threshold value, avoids determining errors and protection maloperation which are easily caused by manual arrangement and setting of the threshold through reliance on engineering experience in a conventional method, and the reliability is higher compared to other methods. Finally, through combination with wavelet feature entropy identification fault types, wrong determination is effectively prevented, and the fault identification accuracy is effectively improved.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a method for quickly judging faults of overhead lines of flexible direct current transmission without threshold value setting. Background technique [0002] Compared with traditional AC transmission, high voltage direct current (HVDC) has significant advantages in high-voltage, long-distance, and large-capacity transmission of electric energy, while flexible DC transmission based on power electronics technology (voltage source converter based high voltage direct current (VSC-HVDC) has achieved vigorous development in large power grid interconnection and point-to-point power transmission due to its advantages of flexible power control and no commutation failure. The grid connection and consumption of new energy provides a solution. However, the isolation and removal of DC short-circuit faults still needs to be solved urgently, and the high-voltage DC circui...

Claims

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Application Information

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IPC IPC(8): G01R31/08H02H7/26
CPCG01R31/08H02H7/268
Inventor 唐志军林国栋王渝红王云茂石吉银邓超平晁武杰李超
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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