Assessing the impact of distributing large grid-tied PV systems on line losses

Abstract

Renewable energy resources are increasingly being used in Uganda due to its abundancy and cost. This includes solar energy, which is a promising alternative to the growing renewable energy usage, like hydro energy. Large solar power systems have gained popularity in Uganda, for example Busitema solar plant, Tororo Solar North, and the Soroti solar plant. The efficiency of these solar plants not only depends on the energy being generated but also on their integration into the existing grid infrastructure In this study, an assessment of the impact of distributing these large grids tied solar PV systems along the network line using the Tororo-Busia 33kV feeder and Busitema solar plant as the case study is done so as to assess the efficiency of power transmission in these cases. The analysis is done through performing simulations using DIgSILENT PowerFactory to model the difference in network losses for both the centralized and distributed configurations. The effects of the solar power intermittencies influenced by effects like time of the day and weather conditions are also analyzed. The results prove that, with a distributed solar PV configuration, power losses are reduced i.e., I2R losses and this improves the efficiency of power distribution. With these reduced power losses, more energy savings are experienced, hence translating to more power saved, hence supporting the case the distributed solar deployment in Uganda. This provides insight that can be used by regulatory bodies and utility companies on optimal planning strategies to maximize the economic and technical benefits. This is in line with the country's goals to reduce energy wastage.