An exit method when no DC protection is available in a DC pole control system

A DC protection and pole control technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as false tripping of the DC system, and achieve the effect of improving reliability and avoiding false tripping of the DC system.

Active Publication Date: 2018-11-23
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

[0009] At present, when the single system of the main system of the pole control system of a DC power transmission project detects that each set of DC protection devices is unavailable, it will start the pole control monitoring and tripping function, and there will inevitably be failures of the pole control system itself. The major hidden danger of false tripping of the DC system due to incorrect judgment of the available state of the device is that when the DC protection device is available, it is wrongly judged that each set of DC protection devices is unavailable due to software and hardware failures of the pole control system itself. Causes false tripping of the DC system

Method used

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  • An exit method when no DC protection is available in a DC pole control system

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Embodiment

[0027] Such as figure 1 As shown, taking the configuration of two out of three DC protection devices as an example, a method for exporting when none of the DC protections are available in the DC pole control system includes the following steps:

[0028] A. Send the available signals formed by the three sets of DC protection devices to the two sets of pole control systems with dual configuration.

[0029] B. Both the main system and the standby system of the two sets of pole control systems judge the available status of the three sets of DC protection devices.

[0030] C. When the main system judges that none of the three sets of DC protection devices are available, it will report a software fault of "None of the three sets of DC protection devices are available"; when the backup system judges that none of the three sets of DC protection devices Unavailable" software failure.

[0031] D. When the main system judges that the three sets of DC protection devices are unavailable,...

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Abstract

The invention discloses an exit method under an unavailable condition of DC protection in DC pole control systems. A primary system of each pole control system reports a software fault that ''various sets of DC protection devices all are unavailable'', and carries out primary and standby system switching of the pole control systems when detecting that various sets of DC protection devices all are unavailable; and when the two sets of pole control systems judge that various sets of DC protection devices all are unavailable, a pole control monitoring trip is generated, so that the reliability of detecting the available states of the DC protection devices by the pole control systems is improved, and a DC system mistrip caused by misjudgement of the available states of the DC protection devices due to the fault of single set of pole control system is avoided.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission in electric power systems, in particular to a method for exporting when no direct current protection is available in a direct current pole control system. Background technique [0002] DC protection reflects the abnormal or fault state of DC system equipment, quickly realizes the isolation of abnormal or faulty equipment, and avoids the expansion of abnormal or fault in the DC system, which is of great significance to the safe and stable operation of DC transmission projects. [0003] There are many redundant configuration methods for DC protection in DC transmission projects, mainly including two out of three configurations and dual configurations. [0004] The so-called DC protection three-out-of-two configuration means that the DC transmission project is equipped with three sets of independent DC protection devices with identical functions. According to the availability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 郑伟何竞松张楠
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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