High precision time synchronization method of substation based on TSN delay sensing capability

The internal clock source device (master clock), TSN switch, protection/measurement and control device and other interval layer devices (slave clock) of the substation all use TSN technology to achieve network interconnection. By introducing the TSN network to measure the uplink and downlink transmission delay, the existing time synchronization protocol is improved, the time synchronization error caused by asymmetric transmission is overcome, and the time measurement equation between the master clock and the protection device or the measurement and control device is obtained. Secondly, the local time prediction equation of the process layer equipment is constructed by using the frequency drift characteristics of the local crystal vibration of the protection device or the measurement and control device. By fusing the time synchronization measurement value of the master clock and the process layer equipment with the local crystal vibration prediction value, the high precision time of the protection device or the measurement and control device is finally obtained.