Sliding Mode Control of a Spacecraft Power System

In this paper, the power electronic interface between a spacecraft electrical power system with a photovoltaic main source and battery storage as the secondary power source is modelled based on the state space averaging method. Subsequently, a novel sliding mode controller is designed for maximum power point tracking of the PV array and load voltage regulation. Asymptotic stability is guaranteed through Lyapunov stability analysis. Afterwards, common LQR, PID and PBC controllers are provided to compare the results with those of the proposed sliding mode controller responses. Simulation of the hybrid system is accomplished using MATLAB and results are very promising.

Keywords:

Sliding mode control , spacecraft EPS , PV/battery hybrid system , LQR , PID , PBC