Message Flow Modeling Analysis and Application for Digital Substation Process Layer Network

A Review of the Methods Used to Model Traffic Flow in a Substation Communication Network

“…Reference [38] aims to extend and simplify the analytical model proposed and developed by [3]. The proposed adaptation of the network calculus and path flow model also discusses the minimum load, maximum load, and typical event scenario; however, a fourth scenario, called the network abnormal flow calculation scenario is added.…”

“…This scenario considers abnormal states of the network due to anomalies that are caused by the communication network itself. Corresponding flow characteristics are seen from many of the abnormal states, which include network jams and switch failure [38]. Calculations performed based on this scenario allow for thresholds to be set in the protection being used to monitor network anomalies [38].…”

“…The method proposed by [38] requires three characteristics of the message source to be defined when developing the model, which are, the number of each type of message packet the source sends, the length of each message package type, and the transmitting frequency of each message packet type [38].…”

“…These vectors consider the transmitting time interval and the packet length of each packet respectively. They are arranged according to the sequential order of the message source in a digital substation in which the total packet types is d [38].…”

“…Initially, [3] proposed the formation of the physical and logical connection models, as well as the supply and service models to find the traffic load distribution as well as the message delay. Reference [38] also defines the physical and logical connection models and in doing so, defines a message transmission path model. This does not differ from the method developed in [3]; there is merely a separation of the calculation carried out into an extra model.…”