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Direct-current line protection method, device and equipment for preventing false start of alternating-current fault

A DC line and false start technology, which is applied in the direction of emergency protection circuit devices, emergency protection data processing devices, electrical components, etc., can solve the problems of DC transmission system failures, DC line protection is prone to false start, etc., to avoid protection misoperation Effect

Active Publication Date: 2021-08-10
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a DC line protection method, device and equipment for preventing false start of AC faults, which are used to solve the technical problem that the DC line protection of the existing power transmission line is prone to false start, which causes the fault of the DC transmission system

Method used

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  • Direct-current line protection method, device and equipment for preventing false start of alternating-current fault
  • Direct-current line protection method, device and equipment for preventing false start of alternating-current fault
  • Direct-current line protection method, device and equipment for preventing false start of alternating-current fault

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Embodiment 1

[0045] figure 1 It is a flow chart of the steps of the DC line protection method for preventing AC fault and false start according to the embodiment of the present invention, figure 2 It is a logic judgment diagram of the DC line protection method for preventing false start of AC fault according to the embodiment of the present invention.

[0046] like figure 1 and figure 2 As shown, the embodiment of the present invention provides a DC line protection method for preventing false start of AC fault, which is applied to a DC power transmission system and includes the following steps:

[0047] S10. Acquire the AC fault signal of the local station, the AC fault signal of the opposite station, the DC voltage, and the sudden change of the DC voltage of the DC transmission system.

[0048]It should be noted that, in step S10 , data that needs to be judged whether to activate the DC line protection is mainly obtained after an AC fault occurs in the DC power transmission system. ...

Embodiment 2

[0069] The embodiment of the present invention also provides a DC line protection device for preventing mis-starting of an AC fault, including a data acquisition module, a first calculation module, a second calculation module and a third calculation module;

[0070] The data acquisition module is used to acquire the AC fault signal of the local station, the AC fault signal of the opposite station, the DC voltage, and the sudden change of the DC voltage of the DC transmission system;

[0071] The first operation module is used to perform OR operation on the AC fault signal of the local station and the AC fault signal of the opposite station to obtain the first fault signal, and perform a negation operation on the first fault signal to obtain the second fault signal;

[0072] The second operation module is used to perform abnormal judgment processing on the DC voltage and the DC voltage mutation, obtain the abnormal voltage and the abnormal mutation, and perform an AND operation ...

Embodiment 3

[0083] Embodiments of the present invention provide a computer-readable storage medium, where the computer storage medium is used to store computer instructions, which, when running on a computer, enable the computer to execute the above-mentioned DC line protection method for preventing mis-starting of AC faults.

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Abstract

The embodiment of the invention relates to a direct-current line protection method, device and equipment for preventing false start of an alternating-current fault. The method comprises the following steps: acquiring a local-station alternating-current fault signal, an opposite-station alternating-current fault signal, a direct-current voltage and a direct-current voltage break variable of a direct-current power transmission system; performing OR operation on the local-station alternating-current fault signal and the opposite-station alternating-current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal; performing anomaly judgment processing on the direct-current voltage and the direct-current voltage break variable to obtain an abnormal voltage and an abnormal break variable, and performing AND operation on the abnormal voltage and the abnormal break variable to obtain an outlet signal; and performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal. According to the method, direct-current line protection is started through a protection action signal obtained after AND operation is carried out on a second fault signal and an outlet signal, an outlet of direct-current voltage break variable protection is shielded, and the situation that direct-current line voltage break variable protection misoperation is caused when a serious alternating-current fault occurs is avoided.

Description

technical field [0001] The present invention relates to the technical field of direct current transmission systems, and in particular, to a direct current line protection method, device and equipment for preventing false start of alternating current faults. Background technique [0002] In the DC transmission system, due to the long transmission line, the DC line failure accounts for 50% of the total failure rate of the DC transmission system. Therefore, the DC line protection is used to control the transmission line. [0003] The existing DC line protection mainly includes DC line traveling wave protection and DC voltage sudden change protection. However, in practical application, due to severe AC faults in the DC transmission system, such as three-phase grounding faults on the rectifier side or single-phase and three-phase grounding faults on the inverter side, the DC voltage on the transmission line will drop rapidly. To a certain extent, the original DC voltage mutation...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268H02H1/0092Y02E60/60
Inventor 王延纬龙霏杨诚易杨苗璐刘志江郭琦罗超
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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