Simulation and analysis of CAN's real-time performance in power system process network

CAN(Controller Area Network) bus is widely used in process network of electric power system and its real-time performance is an important index.The transmission delay of CAN bus is analyzed and the main factors affecting its end-to-end delay are pointed out.According to the non-destructive bitwise arbitration of CAN bus,its data transmission is modeled and simulated with queuing model based on OPNET software.A process network of power station is taken as a research object to get the maximum delay of data frame and the network average traffic load with the consideration of bit stuffing for different network speeds,which verifies the correctness of model.To avoid the excessive transmission delay caused by CAN's priority arbitration,the dynamic classified priority method is applied to ensure the real-time transmission of different data types and the fairness of data transmission in same category for improving the network utilization.Results show that the simulation model reflects the basic features of CAN's transmission delay.