In this paper, data streams are classified into four types conforming to a standardized infrastructure of communication networks for a substation automation system (SAS) based on IEC61850 system. The data exchanged on...In this paper, data streams are classified into four types conforming to a standardized infrastructure of communication networks for a substation automation system (SAS) based on IEC61850 system. The data exchanged on the net are demonstrated to be stochastic according to investigation on the Ethernet communication principles. Four generalized stochastic Petri nets (GSPN) based models for performance analysis of communication networks of IEC61850 system are developed based on the three-level structure of SAS, different time requirements of the four data streams and different networks topology for different voltage level. The GSPN-based model associated with immediate and exponential transitions is proven to be theoretically isomorphic with Markov chain; hence we apply the mathematic methods of performance evaluation contained in Markov chain to the GSPN models proposed. The computer simulation of the model including only sample value data streams shows that it can meet performance evaluation needs of communication networks of IEC61850 system. Further researches should be focused on the performance of the other three models to explain clear how those different data streams are interrelated to and interact on each other.展开更多
电子式电流互感器ECT(Electronic Current Transformer)与电子式电压互感器EVT(Electronic Voltage Transformer)组成的合并单元和间隔层中保护、测量等设备的连接是实现变电站自动化系统中过程层与间隔层串行通信中重要的一环。从IEC61...电子式电流互感器ECT(Electronic Current Transformer)与电子式电压互感器EVT(Electronic Voltage Transformer)组成的合并单元和间隔层中保护、测量等设备的连接是实现变电站自动化系统中过程层与间隔层串行通信中重要的一环。从IEC61850标准出发,基于采样值传输模型对电子式电压互感器模型从逻辑设备、逻辑节点和数据对象三个方面进行了具体的合理构建,并通过特定服务实现此模型在通信栈协议上的映射。通过此模型及其映射,我们明确了变电站自动化系统中电子式互感器和其他设备间的信息交互和数据传输的要求。电子式互感器作为一种新型的互感器,其应用将对变电站自动化系统产生深远的影响。展开更多
文摘In this paper, data streams are classified into four types conforming to a standardized infrastructure of communication networks for a substation automation system (SAS) based on IEC61850 system. The data exchanged on the net are demonstrated to be stochastic according to investigation on the Ethernet communication principles. Four generalized stochastic Petri nets (GSPN) based models for performance analysis of communication networks of IEC61850 system are developed based on the three-level structure of SAS, different time requirements of the four data streams and different networks topology for different voltage level. The GSPN-based model associated with immediate and exponential transitions is proven to be theoretically isomorphic with Markov chain; hence we apply the mathematic methods of performance evaluation contained in Markov chain to the GSPN models proposed. The computer simulation of the model including only sample value data streams shows that it can meet performance evaluation needs of communication networks of IEC61850 system. Further researches should be focused on the performance of the other three models to explain clear how those different data streams are interrelated to and interact on each other.
文摘电子式电流互感器ECT(Electronic Current Transformer)与电子式电压互感器EVT(Electronic Voltage Transformer)组成的合并单元和间隔层中保护、测量等设备的连接是实现变电站自动化系统中过程层与间隔层串行通信中重要的一环。从IEC61850标准出发,基于采样值传输模型对电子式电压互感器模型从逻辑设备、逻辑节点和数据对象三个方面进行了具体的合理构建,并通过特定服务实现此模型在通信栈协议上的映射。通过此模型及其映射,我们明确了变电站自动化系统中电子式互感器和其他设备间的信息交互和数据传输的要求。电子式互感器作为一种新型的互感器,其应用将对变电站自动化系统产生深远的影响。
