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针对中小型变电站自动化系统中通信网络的特点 ,首先采用概率统计的基本方法分析了现场测控单元 (简称为 FMCU)数据产生的规律 ,然后对 FMCU内部的各个程序段进行了较为详细的讨论 ,确定了 FMCU的 CPU资源对轮询 (polling)周期的约束条件。在逐一分析了轮询周期的组成部分之后 ,给出了在上述约束条件下的现场级通信网络稳态性能指标 ,即信道利用率、数据平均发送延时与轮询周期及 FMCU数目之间相互关系的表达式。在此基础上提出了确定通信网络最佳FMCU配置数目的方法。
According to the characteristics of the communication network in the automation system of small and medium-sized substations, the law of the data of Field Measurement and Control Unit (FMCU for short) is firstly analyzed by the basic method of probability statistics. Then the various program sections in FMCU are discussed in detail, The CPU resources of the FMCU bound the polling cycle. After analyzing the components of the polling cycle one by one, the steady-state performance indicators of the field-level communication network under the above constraints are given, that is, the channel utilization, the average data sending delay and polling period, and the number of FMCUs Relationship expression. On this basis, a method of determining the optimal number of FMCUs in the communication network is proposed.