المجلة الدولية للعلوم والتقنية

There are many motives for using solar energy in Libya country, one of which is that the climatic conditions are ideal and strong, and the other is that solar energy is environmentally benign. This paper simulates a stand-alone solar system for a health facility in the city of AZ-Zawia, Libya, using MATLAB programming depending on the area bar selected using a Homer programmer. Solar array sizing and system design calculations were integrated during the simulation procedure. Assuming that the average number of hours of sunshine in the city of AZ-Zawia is about 6.5 hours, the required capacity is about 5 kW, and the energy used per hour is approximately 32 kWh. In addition, system sizing components are calculated, such as the solar array, battery capacity charging and discharging times, charging controller, inverter characteristics, system wiring, circuit breaker features, and characteristics. Also, current I vs. voltage V and power P vs. the voltage V curves of the solar array are simulated. The power output of the designed system is simulated. The input voltage of the DC and current inverter as well as the output voltage of the DC and current inverter are obtained. The intended system consists of a 32 kW/day photovoltaic system with 36 batteries (12 V, 1403.5 Ah) and a 5 kW MPPT inverter. According to system ratings, this system can maintain cottage lighting and appliance loads. A simulation of the dynamic model of the system designed by MATLAB-Simulink was performed. According to the simulation results, the designed system can provide stable voltage and frequency for clinic center loads. KEYWORDS: Stand-alone, Solar Irradiance, Solar System, Loads Classifications, System Sizing, Online Education, HOMER Program, MATLAB Simulink