Abstract
The power electronic interface between a satellite electrical power system (EPS) with a photovoltaic main source and battery storage as the secondary power source is modelled based on the state space averaging method. Subsequently, sliding mode controller is designed for maximum power point tracking of the PV array and load voltage regulation. Asymptotic stability is ensured as well. Simulation of the EPS is accomplished using MATLAB. The results show that the outputs of the EPS have good tracking response, low overshoot, short settling time, and zero steady-state error. The proposed controller is robust to environment changes and load variations. Afterwards, passivity based controller is provided to compare the results with those of sliding mode controller responses. This comparison demonstrates that the proposed system has better transient response, and unlike passivity based controller, the proposed controller does not require reference PV current for control law synthesis.
Highlights
As space missions are getting more involved, satellites systems are getting more complex in parallel
Even the size of satellites are getting smaller due to budgetary constraints, the amount of power required to run the complete system is getting bigger resulting in larger PV arrays, higher battery capacity, and a much more sophisticated electrical power system (EPS)
The requirement for maximum power point tracking (MPPT) is raised by the fact that the MPP of the PV array continuously varies with temperature and illumination changes
Summary
As space missions are getting more involved, satellites systems are getting more complex in parallel. The primary function of EPS is to supply and manage uninterrupted power to its subsystems and payloads These subsystems include power generation subsystems such as PV arrays, power storage subsystems which are batteries with different chemical structures, power control and distribution subsystems like power converters, power distribution units, power conditioning units, and battery charging units [1]. This study uses a sliding mode controller for the MPPT. Unlike passivity based controller which is introduced in [13], sliding mode control approach which is proposed in this paper does not require reference current for control law synthesis. Sliding mode control (SMC) is popular to converters [14]. ELPBC [13] is provided to compare the results with those of the proposed sliding mode controller responses. SMC approach is used for maximum power point tracking of the PV array, load voltage regulating, and charging or discharging the battery.
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