Sequential Switching Shunt Regulator S3R and Maximum Power Point Tracking MPPT for a 3U CubeSat

The electric Power System (EPS) is one of the most critical subsystems in CubeSats, powering all other Subsystems. The power conditioning unit provides the spacecraft payload with a high-performance, steady bus by managing energy and bus voltage. The selection of EPS architecture is a crucial aspect of designing (EPS) should be performed considering system reliability, efficiency, and simplicity of control. This paper uses a sequential switching shunt regulator combined with a maximum power point tracking algorithm to adjust the reference voltage. This architecture improves the system's efficiency and reliability by avoiding series components. The system is simulated in MATLAB/SIMULINK, and the irradiance profile for solar panels is extracted from orbit simulation for a 3U CubeSat in STK software.