Fault Diagnosis and Task Evaluation of Satellite Power subsystem Based on Digital Twin Modeling and Simulation

Zhidong Li, Lishi Liu, Bo Sun, Lei Zhang

Abstract: Aiming at the problem of satellite power subsystem supply capacity imbalance caused by complex operating conditions, device faults or performance degradation during satellite on-orbit tasks, which is difficult to evaluate, a satellite power subsystem task capability evaluation method based on digital companion flight is proposed. By monitoring the consistency of digital companion flight telemetry and on-orbit actual telemtry to monitoring the occurrence of faults, and subsequently initiate model driven inference for fault diagnosis. Finally, using the simulation analysis of the digital twin model under faults, the task capability of the satellite power subsystem can be estimated before the satellite actually turns on certain power loads, so as to avoid the unexpected failure of the satellite payload task and the serious consequences of system damage. The effectiveness of the fault diagnosis and task evaluation method is verified by experiments based on actual telemetry data.