Intelligent substation clock synchronization reliability method capable of improving network sampling

Abstract

The invention discloses an intelligent substation clock synchronization reliability method capable of improving network sampling. The method comprises the steps of selection of a master clock for an external time source, switching of the external time source and self-adaptation delay compensation between the master clock and an extenpasion clock. The method can achieves reliable switching of the external source of the clock and effectively solves the problem that source switching or loss of a part of the external source causes time signal instability and signal loss. In addition, the method can effectively improves the stability for a clock device to trace external source signals, the clock device can effectively select a reliable external source, abnormal work, caused by time abnormality of the external source, of the clock device is prevented, and the long-term stability of time output of the clock device is guaranteed. The method can further achieve main expansion time tick and finish self-adaptation delay compensation of a main expansion chain simultaneously and effectively improves the reliability and the high accuracy of output time of a clock system of a substation.

Description

technical field [0001] The invention relates to the technical field of clock synchronization of intelligent substations in power systems, in particular to a method for improving the reliability of clock synchronization of intelligent substations sampled from networks. Background technique [0002] Compared with traditional substations, intelligent substations put forward new requirements for the clock synchronization system. The focus of clock synchronization is not the synchronization between the time synchronization system and satellite time, but the synchronization and reliability of the data within the station. Especially in the intelligent substation with network sampling, it is especially important for the time synchronization system to meet the synchronization and reliability of the data in the station. [0003] At present, due to the manufacturing process of the clock system, the selection of hardware components, the design of software programs and logic, there are m...

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Problems solved by technology

[0003] At present, due to the manufacturing process of the clock system, the selection of hardware components, the design of software programs and logic, there are many problems in the clock synchronization of smart substations sampled by the network, mainly including the unreliable switching of external time sources, the existence of time jumps in the synchronization system, and the synchronization accuracy. Poor stability, there is a large difference between the output time of a certain clock expansion board and other expansion boards, and the long-term stability of the device is not high enough

In addition, the processing method of the sampling value by the manufacturer of the merging unit is absolutely dependent on the clock synchronization system, which causes when the time of the clock synchronization system jumps, the sampling bit of the merging unit also jumps, causing malfunctions in the station

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