A Real-time Synchronization Method for Control and Protection Distributed System in Power System

Abstract

The invention provides a real-time synchronization method for controlling and protecting a distributed system in a power system. The distributed system is composed of a plurality of physically independent subsystems; each subsystem realizes clock synchronization, interrupt synchronization and data synchronization by receiving and sending a data frame in a fixed format, and the data frame comprisesa management field and a data field; each subsystem sends the data frame in the same cycle, and receives the data frames of other subsystems from the network, and manages the file contents accordingto the received data frame and completes the master-slave system identification, time synchronization between the subsystems and the interrupt synchronization function between the subsystems; and eachsubsystem forms a complete system-wide data mirror locally according to the contents of the data filed of the received data frame and achieves data synchronization. By adoption of the method, the subsystems can obtain analog quantity and switch quantity of the same time section at the same time to complete the application function, the complexity of the software design can be greatly reduced, andthus the reliability of the whole system is improved.

Description

technical field [0001] The invention relates to the field of automatic control of electric power systems, in particular to a real-time synchronization method for controlling and protecting distributed systems in electric power systems. Background technique [0002] In the field of power system control and protection, safety and stability are the most important indicators of system design. With the increase of the voltage level of the power system, the higher the integration of the protection and control single device function, the greater the system risk that a single system failure may cause. In addition, the complexity of the system continues to increase, and the processing capacity of a single system has a bottleneck. In high-end applications, multiple subsystems often need to cooperate and coordinate to complete complex control and protection functions. At the same time, according to the characteristics of the application of secondary equipment in the power system, if e...

AI Technical Summary

Problems solved by technology

[0008] EtherCAT has high bandwidth utilization and low delay, and can easily realize data synchronization and clock synchronization between multiple connection points. However, the mechanism of EtherCAT determines that in a communication cycle, there is only one "frame" in the network. Each device operates on this unique "frame", so a single system failure may cause all communication functions of the entire network to fail, and is not suitable for the distributed system of power system secondary equipment control and protection

[0009] In summary, there is still a lack of a high-speed real-time synchronization system suitable for power system control and protection applications that can realize clock synchronization and data synchronization in distributed systems

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