A remote fault diagnosis method, device and system for a HVDC converter station

Abstract

The invention provides a remote fault diagnosis method, device and system for a high-voltage DC converter station, and relates to the field of fault diagnosis. The method comprises the steps: obtaining a first record image of a first converter station; determining the position of a fault abrupt change area in the first record image; cutting the fault abrupt change area from the first record image according to the position of the fault abrupt change area; enabling the fault abrupt change area and the position of the fault abrupt change area to be transmitted to a second converter station at an opposite end of the first converter station, so as to enable the second converter station to obtain a second record image of the second converter station; obtaining a target region corresponding to the second record image according to the position of the fault abrupt change area; and carrying out the fault diagnosis of the fault abrupt change area and the target region. The method carries out the cutting of the fault abrupt change area in a process of fault diagnosis, so as to reduce the bandwidth occupied for remote transmission, and to reduce the workload of fault diagnosis for a worker.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a method, device and system for remote fault diagnosis of a high-voltage direct current converter station. Background technique [0002] Most of the existing HVDC transmission systems are DC transmission systems at both ends, including rectifier stations, inverter stations, DC lines, rectifier-side AC systems and inverter-side AC systems. There are many types of faults in HVDC transmission systems, and the sources are also very rich. In the system, the thyristor converter valve, the AC side, the DC line, the DC switch field and the grounding electrode may all fail. Once a fault occurs, the converter stations at both ends need to coordinate and cooperate. The DC lines of long-distance DC transmission systems are generally hundreds to thousands of kilometers. The voltage and current data, fault recording information, fault traveling wave monitoring data, etc. of the converter stat...

AI Technical Summary

Problems solved by technology

The voltage and current data, fault recording information, and fault traveling wave monitoring data of the converter stations at both ends need to be communicated remotely. The data volume is large, and it is difficult to compare and analyze, which brings a lot of workload to the operating personnel.

[0003] The fault simulation modeling technology is based on typical fault conditions, but sometimes two simultaneous faults, multiple secondary faults caused by a single fault, and atypical faults such as small disturbances may occur in actual engineering. Considering and modeling the actual situation, it is inevitable that the actual fault waveform does not exist in the sample library of typical fault characteristics

[0004] The algorithm used in the existing technology does not take into account the large number of wave recordings of the converter stations at both ends and the huge amount of data of operating parameters such as voltage and current in the actual communication, and the converter stations at both ends directly use all the data for remote communication without screening. Larger, less productive problems

Images