中文摘要：

以太网无源光网络（Ethernet passive optical network， EPON）是构建智能配电网接入层通信系统的重要发展方向。根据智能配电网各业务的服务质量要求，特别是基于网络通信的新型保护与控制技术的发展需要，提出一种基于业务缓存速率的改进加权间插轮询动态带宽分配算法。该算法根据光网络单元（optical network unit，ONU）终端业务流的类型和产生速率，对轮询周期内的通信需求建立虚拟加权缓存队列，在保证EPON轮询速率的基础上，光线路终端对各ONU终端的带宽进行动态分配，以更好满足不同业务的通信要求。此外，针对所提出的动态带宽调度算法，通过网络演算理论建立 EPON 系统各业务的时延上界计算模型，以为通信系统的实时响应特性分析和评估提供依据。OPNET仿真结果表明：所提预测负载调度算法可有效提高通信效率，较好兼顾基础通信业务和继电保护高实时性通信业务的不同需要；同时，也验证了推导出的 EPON 系统业务时延上界的正确性。

英文摘要：

Ethernet passive optical network （EPON） technology as one of the primary technologies for access networks has been selected by the smart distribution networks. This paper presented an improved weighted interleaved polling with adaptive cycle time （IW-IPACT） algorithm based on business rate according to the quality of service （QoS） requirement of each traffic class, especially on the requirement of new protection and control technique. A virtual weighted buffer queue for bandwidth requirements of EPON was constructed during a polling cycle. The bandwidth of optical network unit （ONU） is granted from the optical line terminal （OLT） considering the polling rate of the EPON. In addition, in order to evaluate the real-time performance of the IW-IPACT algorithm in EPON, a new delay bound calculation method of each traffic class was derived by network calculus theory. The evaluating results indicate that bandwidth utilization of EPON is improved by the IW-IPACT algorithm. Meanwhile, the calculus and OPNET simulation results also show that EPON can meet the real-time application requirement of basic traffic class and the relay protection.