The IECPS Reliability Assessment Method Considering the Working State of Information Equipment

The failure of information system in integrated energy cyber physical system (IECPS) will affect the reliability of the system to a certain extent. In order to study the influence of the working state of information equipment on the reliability of IECPS, this paper defines the concept of cyber physical subsystem and proposes a reliability evaluation index applicable to IECPS. Considering both energy equipment and information equipment failures, this paper also considers the case of equipment working state transfer in order to be closer to the real situation, i.e., the equipment repair model is considered. In the reliability evaluation, Markov process and Monte Carlo are combined to build a multi-time state probability model; establish the mathematical model of each energy equipment and the energy constraints during the operation of the system. In addition, the communication of information flow and energy flow should be carried out between the information layer and the physical layer, so the information transmission process should also be modeled. Finally, the impact of information equipment failure on the reliability is analyzed using the proposed reliability evaluation indexes. The simulation takes typical IECPS as an example, and evaluates the degree of impact of information equipment failure on the reliability of IECPS according to the above evaluation indexes and methods. The results can be used as a reference for the planning and operation of the IECPS.