Simulation of Electrical Power System in a Satellite Digital Twin

The increasing complexity of modern spacecraft requires advanced tools to model, analyze, and validate their on-board subsystems before deployment. This thesis presents the design and implementation of a Digital Twin of a satellite’s Electrical Power System (EPS), with particular emphasis on the Power Control and Distribution Unit (PCDU). The Digital Twin is conceived as a high-fidelity software replica that mirrors the functional behavior of the physical system, enabling real-time monitoring, prediction, and testing in both nominal and off-nominal scenarios. The developed simulator, implemented within the SIMULUS framework, reproduces the interactions between solar arrays, batteries, and electrical loads, incorporating Constant Current/Constant Voltage (CC/CV) charging logic and realistic power flow constraints. By providing accurate representations of supplied power, voltage regulation, and load prioritization, the Digital Twin supports both design validation and operational decision-making. This implementation of Satellite Digital Twin v1.0.0 lays the groundwork for further enhancements, bridging the gap between simulation and in-orbit operation to support more reliable and efficient satellite missions.