基于EPON+的高可靠性固定时延网络在智能变电站应用研究

摘要

Based on the communication demand of smart substation, a new kind of communication architecture named EPON+, which is developed on the basis of EPON (Ethernet Passive Optical Network) and has the character of high reliability and fixed latency, is proposed as the desired one to establish the network in substation. Then the type and the quality of service (QoS) of EPON in substation, including the requirement of real-time and reliability, can be defined precisely. To satisfy the QoS, some modifications are made on EPON technology, which go as follows. In the software aspects, not only the manner of register and the bandwidth allocation algorithm are changed, but the “delay-waiting”algorithm also is deployed, so that the packets can be transmitted fast and smoothly. Then with the duplicate configuration in hardware, the reliability of communication can be ensured. Finally, the performance of EPON+based network is tested in 220 kV Yongning Substation. The results show that EPON+can meet the requirement of substation, therefore testify the feasibility of deploying EPON+in substation communication architecture.%基于智能变电站的网络通信需求，把在以太无源光网络(Ethernet Passive Optical Network, EPON)技术基础上开发的高可靠性固定时延网络(以下简称EPON+)应用到智能变电站内的网络组建中。准确定义了变电站内EPON+的通信业务及服务质量(Quality of Service, QoS)，包含实时性和可靠性方面的要求，并对EPON技术作出针对性修改。软件方面，通过改变注册方式、带宽分布算法以及采用延时等待算法，确保了报文传输的快速性和均匀性。再通过硬件上的双重化配置，使报文可靠性要求得以满足。最后结合220 kV永宁变的工程实例，测试基于EPON+的报文传输性能，结果证明EPON+技术适用于变电站的组网应用。