Precision Time Synchronous System Based On IEC61850 In Digital Substation

The development of IEC61850,the novel transformers,intelligent circuit breakers, network technology,provides technological basis for digital substation.Information is transmitted over network in digital substation,in the communication network,the traditional ways of synchronization and the directly GPS timing is not appropriate.However,network timing has economic,simple,efficient and standardized characteristics,and a clear requirements and model of network time synchronization is specified in IEC61850.In this paper,based on IEC61850,architecture of substation synchronization system mainly using SNTP and IEEE1588 is put forward.Focused on the precision synchronization system of process bus,that is,the realization of IEEE1588,a novel scheme based on embedded architecture achieving IEEE1588 synchronization module is proposed.The scheme realizes hardware/software partition,which is observably effective to achieve systemwide synchronization accuracy in the submicrosecond range.