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Method for detecting commutation failure of direct current transmission

A technology of commutation failure and direct current transmission, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices, can solve problems such as unbalanced three-phase voltage of AC lines, difficulty in accurately detecting commutation failure, and large potential safety hazards in the power grid, etc., to achieve Improved safety, fast calculation speed, and the effect of avoiding failures

Active Publication Date: 2018-06-12
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Problems solved by technology

[0005] Therefore, the current detection methods for commutation failures in DC transmission systems have the problems of low detection accuracy, difficulty in accurately detecting commutation failures, and prone to misjudgment, which can easily lead to unbalanced three-phase voltages of AC lines and potential safety hazards during power grid operation. larger

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  • Method for detecting commutation failure of direct current transmission
  • Method for detecting commutation failure of direct current transmission
  • Method for detecting commutation failure of direct current transmission

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0035] Example. A method of detecting DC transmission commutation failure, such as Figure 1 to Figure 5 As shown, the method collects DC current sampling data and detects the DC current sampling data, thereby judging the specific time point of DC commutation failure, and achieving the purpose of quickly detecting the time point of commutation failure.

[0036] The method is to collect DC current sampling data, based on the DC current sampling data before and after the commutation failure, and according to the abnormal jump of the DC current when the commutation fails, the second-order and above-order derivatives of the current data have the characteristics of a significant increase , using the Daubechies wavelet with the second-order vanishing moment to detect the singularity of the DC current sam...

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Abstract

The invention discloses a method for detecting a commutation failure of direct current transmission. According to the method, characteristics of direct current waveforms before and after the commutation failure are collected, Daubechies wavelets with second-order vanishing moments are adopted for analysis, a normal state and slight faults of an alternating current system are excluded, and the purpose of quickly detecting the time point of the commutation failure is achieved. The method has the advantages that in the process of detecting the commutation failure of a direct current transmissionsystem, the calculation process is simple, the calculation speed is high and the detection precision is high; the method can be applied online, the accurate detection of the commutation failure is facilitated, commutation failure information can be quickly obtained, the situation that a power transmission line and converter station equipment fail is avoided, and the running safety of a power gridis improved.

Description

technical field [0001] The invention relates to the field of phase commutation detection of power transmission systems, in particular to a method for detecting phase commutation failure of direct current transmission. Background technique [0002] High Voltage Direct Current (HVDC) has very important practical significance for improving the transmission capacity of the existing power system and tapping the potential of existing equipment. It is a power transmission method vigorously developed by the country. [0003] The converter of the HVDC system commutates 6 times in each cycle (0.02 seconds). The blocking ability can be restored, or the commutation process has not been completed during the reverse voltage. In both cases, when the valve voltage changes to positive direction, the commutated valve will commutate to the valve originally scheduled to withdraw from conduction. , which is called a phenomenon known as commutation failure. Compared with the rectifier side, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 杨阳古婷婷张忠郭紫昱
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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