Fault Modeling and Simulation Based on Cyber Physical System in Complex Distribution Network

With the high penetration of renewable energy in distribution network and the gradual improvement of smart grid construction, the physical processing and information processing are closely coupled. Complex distribution network is a typical cyber physical system(CPS). The sequential property of electric power system and the time-discrete property of communication system have made the research of CPS for distribution network complicated. In view of dynamic process of CPS for distribution network, the fusion modeling and large-scale simulation calculation and platform of CPS for distribution network were investigated. First, the characteristics and the interaction principle of CPS for distribution network were analyzed. And the coupling mode of CPS for distribution network was proposed. Next, the simulation model of physical system was proposed. From different information data types, information data flow was modeled. On this basis, a framework for integration of multiple cyber physical modules was constructed. And CPS fusion method was proposed. Taking the simulation platform of CPS for distribution network as example, characteristics of RT-LAB as the physical simulation tool, and OPNET as the information simulation tool were analyzed. And the feasibility of co-simulation of RT-LAB and OPNET was elaborated. Finally, a fast simulation framework based on RT-LAB was established. And a cooperative simulation for electrical power system and control system was proposed. Based on the essential difference between physical events and information events, two kinds of simulation timing synchronization methods suitable for physical model and information model were presented. A 62-nodes distribution network with distributed generators of an area was modeled on RT-LAB. The simulation results of CPS platform based on RT-LAB and OPNET show that when a single-phase fault occurs in a complex distribution network, communication problems such as congestion delays and error codes of information system in the transmission of measurement data and control instruction cause failures to be dealt with in time delay to trigger a cascading fault. The results effectively verified the importance of control information system to monitor distribution network. At the same time, the CPS simulation platform for the actual environment of complex distribution network is necessary.