Distributed power system always need a communication structure which can realize one to multiple module's communication. It's very important to choose the hardware and communication protocols. To realize high rate and high reliability system communication with lower cost, a high-speed serial communication interface method based on Field-Programmable Gate Array(FPGA) is proposed. Full duplex physical interface based on RS485 and user-defined data-link-layer protocol are used. The idea of synchronic signal is proposed to solve problems such as the data conflict and signal level superposition in many module share the same bus. The experimental results show that the system is stable and reliable.%分布式电源系统采用一对多通信结构,需在低成本的基础上实现通信速率、稳定性要求,需要合适的接口形式和通信协议实现主站与各从站的信息交换.提出了基于现场可编程逻辑阵列(FPGA)的串行通信接口方案,采用四线制全双工RS485作为物理电平接口、自定义数据链路层协议,引入同步信号解决多个从机共用总线引起的电平叠加和数据冲突问题.实验结果验证了该方案满足了多个模块与中央的通信速率要求、工作稳定、成本低廉.
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