Research on status online monitoring techniques of substation time synchronization based on reverse network measurement algorithm

With the development of substation technology, the data collected by automation systems increasingly distributed and discrete. The electric power system has a large number of applications running in a specific time sequence, failure analysis also depends on the sequence of events record. And time synchronization is the link of these discrete data, therefore, time synchronization technology is a key technology to ensure that intelligence substation automation system running stably. However, some recent failures indicate the current reliability of time synchronization architecture cannot meet the demand. An online monitoring system for time synchronization status of intelligent substation equipment is urgently needed. This paper analyzes the existing application's comprehensive needs of time synchronization online monitoring system, then presents six basic monitoring methods, at last, by evaluating their advantages and disadvantages, obtained a preferred object, and proposed reverse network measurement algorithm, achieved the online monitoring function without new equipment and cabling, finally to verify the effectiveness of the method through the experiment. The result provides important support to strengthen the management of time synchronization application work for state grid corp.