Implementation of Modified MPPT P&O in Off-Grid Rooftop Solar Power Systems (A Case Study: PT. Hydratech Smart Indonesia Building)

Abstract

PT Hydrateh Smart Indonesia is a company that has implemented rooftop solar PV technology to meet the needs of electric power in the commercial office sector on a small scale. The use of rooftop solar PV is carried out to reduce the load from PLN and to find out how much profit in terms of power efficiency has been generated in the use of rooftop solar PV. As with other renewable energy technologies, the challenge faced by rooftop solar power plants is the fluctuation of the sun, in this case its irradiation, which has an important role in the process of extracting optimal output power. Rapid changes in irradiation affect the utilization of solar energy into electrical energy. This research designs an optimal rooftop solar power plant from the PT Hydratech Smart Indonesia building as a representative of the use of rooftop solar power plants with a capacity of 3600 W equipped with maximum power point tracking (MPPT) to increase the output power value. Of the several MPPT algorithms that have been used, the perturb and observe (P&O) algorithm is the most popular due to its easy implementation and economical price. However, the drawback of this algorithm is the efficiency of its performance which is still fairly low so it is necessary to modify the step size value. The results showed that using the conventional P&O algorithm, MPPT was able to achieve an efficiency of 81.19% and the modified P&O algorithm of 89.06%.