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.