数字化变电站信息传输时延上界计算方法

针对现有基于排队论的信息传输时延计算方法的不足,提出了基于网络演算的数字化变电站信息传输时延上界计算方法,分析了数字化变电站内信息类型和特性,建立了变电站内信息的漏桶模型,引入微流和级联网络的概念,应用网络演算理论,推导了普遍适用、形式统一的计算时延上界的解析表达式,据此可以在信息传输前准确判断传输时延能否满足时限要求。以一典型220kV数字化变电站为例,采用该方法得到了变电站内各种信息流的传输时延上界,表明本方法的有效性。该方法为构建满足时延要求的数字化变电站提供了理论依据。

A method for calculating the upper delay of infrormation transmission inside digital substation

In order to overcome the shortcomings of the methods based on queuing theory, the method based on network calculus for calculating the upper delay of information transmission inside digital substation is proposed. Firstly, the characteristic of various information flows inside substation is classified and analyzed. Secondly, the leaky bucket model is established. Finally, the concept of micro-flow and connected networks is introduced, the unification of formulation of the upper delay of various information flows is derived through introducing network calculus theory. The formulas above can be used to verify whether the delay of each information flow meets constraint. Taking the case of a typical 220kV digital substation as an example, the upper delay of various information flows inside the digital substation is derived applying the method. The case study indicates the validity and feasibility of the method proposed. The method proposed provides the theoretical basis for constructing a digital substation meeting the delay constraint.