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基于电力电子标准模块(PEBB)构建的电能变换装置具有低成本、易于重构、高可靠性等优势,采用分布式数字控制结构,其中级联环形拓扑是其通信结构的一种主要解决方案。环网拓扑本身特性决定了实现网络节点间的同步是一个关键技术问题。阐述了2种用于环网拓扑的同步策略,分别为基于网络时钟的同步方法和基于时间戳的同步方法。针对实际运用,从同步精度、同步速度、资源消耗、稳定性等方面对2种同步策略的优劣进行了对比分析。
The power conversion device based on the Power Electronics Standard Module (PEBB) has the advantages of low cost, easy reconstruction, high reliability and the like. The distributed digital control structure is adopted, and the cascaded ring topology is a main solution of the communication structure. The characteristics of ring topology itself determine the synchronization between network nodes is a key technical issue. Two kinds of synchronization strategies for ring topology are described, which are the synchronization method based on network clock and the synchronization method based on time stamp respectively. According to the practical application, the advantages and disadvantages of two kinds of synchronization strategies are compared from the aspects of synchronization accuracy, synchronization speed, resource consumption and stability.