船舶综合电力系统监控网络实时性分析

Real-time performance analysis of integrated power system monitoring and control network in vessel

针对船舶综合电力系统监控系统对数据传输的实时性需求,分析了数据流的特征,并按照实时性强弱进行了分类。对基于CAN和以太网的两层网络结构,在CAN网络使用固定优先级,而在以太网使用严格优先级队列机制确保实时数据的优先传输。为了评估网络的实时性能,基于网络演算理论对传输时延的上界进行分析计算,给出了各数据流的到达曲线和服务曲线,并得出最大时延的计算表达式。以一个典型的船舶电力系统为例验证了该方法的有效性,为构建合理的综合电力系统网络平台提供了理论依据。

With the demand of real-time dataflow transmission in power system monitoring and control network,this paper analyses the characters of dataflow,and classifies it according to real-time character.To the two layers network architectures of CAN and Ethernet,it gives the method of real-time dataflow transmission with fix priority in CAN,and strict priority queue（SPQ）in Ethernet.Then it analyses and calculates the max delay bound with network calculus.The arrival curve and service curve are given,and the delay bound expressions are also gotten.At last,it gives an example of traditional power system to verify the validity of the method.This paper supplies a theoretical evidence for designing a reasonable IPS network platform.