Network message synchronizing method for process levels of intelligent substation

Abstract

The invention discloses a network message synchronizing method for process levels of an intelligent substation. The network message synchronizing method includes: merging units reserve time domains according to configuration when transmitting SV (sampled value) messages, the time domains can accumulate transmission time delays of network transmission devices when the messages are transmitted through the network transmission devices, an SV data receiving device resets transmitting time of the SV messages by referring local time and subtracting the time domains from message received time of the device after receiving the SV message, and sampling time can be calculated according to rated time delay of the merging units, thereby the SV data receiving device can synchronize received messages of different merging units so as to be guaranteed to carry out accurate data calculation and action. The network message synchronizing method for process levels of the intelligent substation can solve the problem that existing process level network over depends on time network.

Description

technical field [0001] The present invention relates to the communication of various devices such as merging units of intelligent substations, network transmission equipment (such as switches), and SV data receiving equipment (such as protection, measurement and control devices, etc.), and particularly relates to a synchronization method for devices to send and receive SV messages. Background technique [0002] The process layer network of smart substation is composed of merging unit, smart terminal, network transmission equipment (such as switch), SV data receiving equipment (such as protection, measurement and control device), etc. SV data receiving equipment (such as protection, measurement and control device) SV message, the SV data receiving device performs data calculation and corresponding actions according to the received SV message. The SV data receiving device needs to receive SV messages sent by multiple merging units at the same time, and it is required that the ...

AI Technical Summary

Problems solved by technology

Since the time synchronization messages received by the merging unit, protection, and measurement and control devices are sent through the network transmission equipment, the time synchronization accuracy of the merging unit, protection, and measurement and control devices must be affected by the network transmission equipment's own PTP algorithm accuracy, PTP algorithm reliability, The impact of clock accuracy and message traffic on the network, when the switch’s own PTP algorithm accuracy, PTP algorithm reliability, or clock accuracy cannot be guaranteed, it will cause the time synchronization accuracy of the merging unit, protection, and measurement and control devices to decline. The time synchronization error of the unit, protection, and measurement and control devices reaches the second level, resulting in the failure of the protection and measurement and control devices to work normally

When the network message traffic is too large, it will lead to the loss of PTP time synchronization messages, which will also lead to the decrease of time synchronization accuracy or even the failure of time synchronization.

The above situations will seriously affect the correct calculation and action of protection, which will bring great safety hazards to the reliable operation of the entire smart substation

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