Method for sharing multi-interval transient traveling wave signals of intelligent substation in real time

Abstract

The invention discloses a method for sharing multi-interval transient traveling wave signals of an intelligent substation in real time. The method comprises the steps that the voltage and current signals of a measurement line are collected by each merging unit in real time; an edge detecting method is utilized for carrying out fault feature extraction on real-time sampling data; sampling value message information is reconstructed, and a set of traveling wave feature values used for judging a fault line is added to an ASDU; meanwhile, the merging units reduce message transmission frequency, and 100M Ethernet downward traveling wave message transmission frequency is reduced to the power frequency signal sampling frequency of 1,000 Hz; IED equipment is protected and controlled to receive and analyze traveling wave messages sent by the merging units, and the fault line is judged according to fault feature values including in the messages. The data processing capacity of the merging units is utilized for expressing the effective fault features of the transient traveling wave signals, the performance of a substation protection and control system is improved by fully utilizing fault full spectrum band information, the real-time performance of the communication of a substation process level can be guaranteed, and high practical value is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of power systems, in particular to a real-time sharing method for multi-interval transient traveling wave signals of an intelligent substation. Background technique: [0002] The current implementation of smart substation process layer communication is mainly point-to-point communication based on the IEC61850 communication protocol, but there is no doubt that compared with traditional substations, the main advantages of smart substations are reflected in the sharing, fusion and effective use of cross-interval and full-band information. Cross-interval information sharing reflects the requirements for process-level network communication; while full-band information emphasizes the horizontal utilization of the entire frequency band of fault information from DC components to transient traveling waves. Compared with power frequency signals, transient traveling wave signals are not affected by system oscillation,...

AI Technical Summary

Problems solved by technology

[0004] Relevant studies have shown that based on OPNET Modeler software simulation of process bus communication for information sharing under 100Mbit / s Ethernet, when the sampling rate rises to 1000-1553 points per cycle, the process layer network can only guarantee real-time transmission of single-interval data. When the sampling rate When higher, the communication network performance will be severely blocked

The sampling rate of traveling wave line selection is generally above 200kHz, reaching 4000 points per cycle, and the process layer communication network is multi-interval data transmission. If the data is not processed, the communication network will be seriously blocked, resulting in substation process layer The real-time performance of the communication network cannot be satisfied

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