Pattern matching based security protection method for relay protection information of electric system in network environment

Abstract

The invention relates to a relay protection information safety protection method of electrical power system, which is based on mode match in the network. The inventive method uses the digital mutual inductor to collect the data of current and voltage to be transmitted to the transformer substation via the network; when the relay protection data judges that the electric network has accidence according to received data, to output motion signal, the relay protector via the network of transformer substation to collect the data of current and voltage of all circuits and bus in said substation to be output to be probability neural net, via which it processes the mode match and judges if the current and voltage data match known accidence mode to avoid the error motion of relay protection. The invention uses probability neural net to process mode match between the accidence data and the known accidence data to recognize the false accidence, to improve the information safety protection ability of relay protector, and the error motion of relay protector caused by receiving mistake data signal.

Description

technical field [0001] The invention relates to the relay protection technology of electric power system, which belongs to the field of electric power system protection control. Background technique [0002] Since the mid-1990s, with the rapid development of computer and network communication technology, substation automation has made substantial progress. In the substation automation system, there is a tendency to use network technologies, such as LonWorks (Local Operation Network), CAN (Control Area Network), Ethernet, etc. to replace control cables. The digital transformers successfully developed in recent years can package the collected instantaneous current and voltage signals in a specified frame format through the digital output port and transmit them to the secondary metering and protection equipment of the substation. The current and voltage signals collected by digital transformers can be transmitted through the network to completely share data in the measurement ...

AI Technical Summary

Problems solved by technology

At present, communication encryption technology can effectively reduce the security problems caused by system security vulnerabilities, but complex encryption algorithms require longer encryption and decryption time, which is not conducive to ensuring the rapidity of relay protection; secondly, when the network communication quality of service (QoS ) becomes worse, encryption and decryption may fail due to errors in identity authentication, password distribution, etc., and the integrity and correctness of current and voltage sampling data cannot be guaranteed

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