分布式电力电子高速环网时钟同步技术研究

对于大容量的电力电子装置,采用分布式的模块化控制方案已是一种趋势。由于分布式电力电子装置的分散化控制结构,需要实现多个分布时钟的高精度时钟同步。文中针对级联H桥变换器提出了一种分布式实时以太网高速环网控制结构,并在UDP协议的基础上制定了相应的环网通信协议,通过分析环网主从站设备间的时钟偏差,提出了高精度的主从站设备的时钟同步方案。最后,根据提出的同步方案搭建了以太网高速环网控制测试平台,通过实验结果验证了主从站的高速环网通信和高精度时钟同步,且时钟同步精度在25 ns以内。

Clock synchronization technology for distributed power electronic high-speed looped network

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.