Impact assessment of residential electric vehicle charging on the lv distribution grid in Uganda.

Abstract

Uganda is committed to integrating electric mobility solutions into the public transportation sector and encouraging the adoption of electric vehicles (EVs) to combat climate change and reduce greenhouse gas emissions. Using a segment of the distribution grid in Kololo, Kampala district, as a case study, this study investigates the effects of Plug-in Electric Vehicle (PEV) charging on a sample Low Voltage (LV) grid. The study presents an overview of the residential charging characteristics of electric vehicles and uses computer simulation with DigSILENT PowerFactory to simulate and analyze load demand and distribution system distortion brought on by PEV battery charging. The investigation into various PEV penetration rates (12.5%, 25%, and 50%) and an examination of the uncontrolled charging scenario are also included in the analysis. Under the uncontrolled charging scenario, the 24-hour time simulations show effects on transformer loading, feeder loading, and system losses in the LV grid during the charging hours. In response to these effects, proposed solutions such as transformer upgrades and implementing controlled charging scenarios are discussed. This research contributes to a better understanding of the challenges associated with installing EV charging infrastructure on the low-voltage grid.