Abstract
Due to the intermittent nature of solar irradiation, it is inevitable to integrate the system of energy storage in the PV standalone system. In this paper, Energy Storage System ESS composed of a battery bank and Supercapacitor SC has been employed to maintain power supply to the load. Because of the fast rate of charge/discharge of SC, it would handle the surge transient energy and that would reduce the required capacity of the battery, increase the life span, and lessen the maintenance cost. The control strategies ensure well power flow control between the PV system and ESS and thus meet the load demand, moreover sustain the DC-link voltage regulated. In the implemented control techniques, a protective improvement is proposed which would limit overcharging of the battery. That would minimize battery degradation and enhance the reliability of the system. This is performed by employing the battery uncompensated power to reduce the stress on the battery during the large fluctuations in the power due to load/irradiance variation. The control approach is based on providing optimal reference current for the ESS with fast dynamic response and reduce the computational burden when implementing in real-time, hence stable power could be delivered to the load. Moreover, the generated PV power is controlled based on the battery charging state and the demand power and this would ensure stable control of DC output voltage. The aforementioned points have led to vigorous PV system having a long-life battery and are capable of preserving energy balance between generations and load even at the abrupt load/solar irradiation variations. . A profile of solar irradiance for selected area has obtained and the system is tested under these data, and it has shown well dynamic response and this could be used for consideration of prototype implementation. The proposed control system is simulated by MATLAB/Simulink and the results show good performance under different scenarios of load/solar irradiation variations
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