Cyber-physical co-simulation of shipboard energy management network and power system

  Objectives  With the wide application of energy management system (EMS) networks in shipboard power systems, their non-ideal characteristics have a growing effect on the system performance. To analyze the close-coupling feature of the two systems, a cyber-physical co-simulation method that combines information network and power system simulation is proposed.

  Methods  Using OPNET and Matlab/Simulink as an information network and power system simulator respectively, the software data exchange interfaces and co-simulation synchronization method are proposed based on a uniform co-simulation framework. A co-simulation model of two synchronous generators running in parallel with load is built, and the effect of EMS information network characteristics including link latency and background traffic on secondary power distribution is studied.

  Results  Simulation results indicate that after adding link latency (2 and 5 ms), the total latency of the control process is around 12 and 30 ms. The fixed latency on network links significantly affects the response of the power system. When network links are overloaded by background traffic, the packet latency and system closed loop control latency will increase, the system will diverge after a certain period.

  Conclusions  The proposed method provides an effective simulative method for future research on shipboard close-coupling EMS information network and power system.