The adoption of distributed modular control strategy is a trend in large capacity power electronic devices. Due to the decentralized control structure of distributed power electronic devices, the high precision clock synchronization of multiple distribution clocks is required. This paper presents a distributed real-time Ethernet high-speed looped network control structure for cascade H bridge converter, on the basis of the UDP protocol, develops the corresponding looped network communication protocol, puts forward the high-precision clock synchronization strategy of master-slave station equipment by analyzing the ring clock deviation between the webmaster from station equipment. Finally, The Ethernet high-speed looped network control test platform is built according to the proposed synchronization strategy, the results of the experiment confirmed the communication and the high precision clock synchronization of the high-speed looped network, and clock synchronization accuracy within 25 ns.
