Abstract：For the clock synchronization accuracy shortage of a mine grid system, an algorithm is proposed.The algorithm combines the IEEE1588 protocol and Ether CAT protocol, meanwhile drifts the compensation of a crystal oscillator and tracks phase frequency modulation. A clock synchronization system of mine grid based on Ether CAT is designed to achieve the field level network control of coal mine underground. The system makes the advantages of IEEE1588 protocol and Ether CAT protocol play fully and complement each other, so that the control accuracy of a time synchronization system is further improved to nanosecond level. The synchronization effect of master slave clock is obtained by experiment, and the feasibility of the mine time synchronization system is verified based on Ether CAT.

Keyword：EtherCAT;time synchronization;electric power system;IEEE1588 protocol;