Method and device for judging state of high-voltage direct-current power transmission system and medium

By judging the operating status of AC field equipment in the high-voltage direct current transmission system and utilizing line current thresholds and bus interconnection status, the problem of misjudgment of the final circuit breaker and final line status was solved, realizing accurate monitoring of the line energy flow loop and improving the accuracy and safety of the control system.

CN121546684APending Publication Date: 2026-02-17GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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Patent Information

Application Number
CN202511894893.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-16
Publication Date
2026-02-17

AI Technical Summary

Technical Problem

In high-voltage direct current transmission systems, existing technologies cannot accurately determine the status of the last circuit breaker and the last line, especially when the AC line is under no-load charging conditions, which can easily lead to misjudgment. This can cause the control system to fail to correctly identify the line status, thereby affecting the emergency shutdown of the converter.

Method used

By judging the operating status of AC field equipment, including comparing the circuit quantity with the preset current threshold, and combining the bus interconnection status, it is determined whether the circuit breaker is the last circuit breaker or the last line connected. The load current value, current mutation value and input and output value of SR trigger are used for auxiliary judgment to ensure that the line forms an actual energy flow loop.

Benefits of technology

This effectively avoids misjudgment of the last circuit breaker and the last line under no-load conditions, ensuring that the control system can correctly identify the line status, improving the accuracy of the last circuit breaker and last line protection functions, and ensuring the safe operation of the converter.

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Abstract

The invention discloses a method and device for judging the state of a high-voltage direct-current power transmission system and a medium, and the method and device have the following beneficial effects: in the process of judging the operation state of alternating-current field equipment in the step S1, the circuit quantity of a line is compared with a preset current threshold value; the operation state of the line is further judged according to the comparison result, and whether the line forms an actual energy circulation loop or not is monitored, namely, whether the line forms the actual energy circulation loop or not can be judged by adding the auxiliary judgment condition that whether the line is in the operation state or not; therefore, misjudgment of the last circuit breaker and the last circuit by the control system in the empty charging state is well avoided.
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