研究了多业务传送平台(MSTP)网络汇聚型以太网业务的环形开法(以一个或几个以太环网将各厂站与调度机构串联起来)在电力系统中的应用。通过数学建模计算、采用南方电网主干通信网实际案例印证等手段，对比了环形开法和星形开法(开通从各厂站至调度机构的点对点以太网业务)的链路带宽消耗、中心站以太网端口和汇聚处理能力消耗、业务可靠性等指标。结果表明，环形开法在业务可靠性、中心站以太网业务汇聚能力消耗上较星形开法有明显优势；当每站的业务带宽需求相对2048 kbit/s较小时，环形开法在链路带宽消耗、中心站以太网端口数量消耗上较星形开法也有明显优势；仅在每站的业务带宽需求大于2048 kbit/s 时，环形开法在链路带宽消耗、中心站以太网端口数量消耗上的优势不明显或没有优势。最后，根据计算结果，提出了应用环形开法的几点建议。%An investigation is made on the application of the ring-arrangement (using single Ethernet ring or multiple Ethernet rings to connect transformer substations or electric power plants with the dispatching center)in convergent Ethernet services of multi-service transport platform (MSTP) network in a power system.Through mathematical modeling and examples of operating backbone communications network of China Southern power grid,this paper compares link bandwidth consumption, Ethernet ports consumption of center node(dispatching center),Ethernet convergence ability consumption of center node,and service reliability between ring-arrangement and star-arrangement(establishing end-to-end Ethernet services from transformer substations or electric power plants to dispatching center).Results show that ring-arrangement has advantages of convergence ability consumption of center node and service reliability,and advantages of link bandwidth consumption and Ethernet ports consumption when bandwidth requirement of each node is relatively small compared to 2 048 kbit/s;but has indistinct,if any, advantages of link bandwidth consumption and Ethernet ports consumption only when bandwidth requirement of each node is no less than 2 048 kbit/s.Finally,according to the results,this paper offers some proposals to properly apply ring-arrangement.
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