Thepower electronic interface between a satellite electrical power system (EPS) with a photovoltaicmain source and battery storage\r\nas the secondary power source is modelled based on the state space averaging method. Subsequently, sliding mode controller is\r\ndesigned for maximum power point tracking of the PV array and load voltage regulation. Asymptotic stability is ensured as well.\r\nSimulation of the EPS is accomplished using MATLAB. The results show that the outputs of the EPS have good tracking response,\r\nlow overshoot, short settling time, and zero steady-state error.The proposed controller is robust to environment changes and load\r\nvariations. Afterwards, passivity based controller is provided to compare the results with those of slidingmode controller responses.\r\nThis comparison demonstrates that the proposed system has better transient response, and unlike passivity based controller, the\r\nproposed controller does not require reference PV current for control law synthesis
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