Modelling the Impact of Distributed Power Generation on Local Grid Stability. The Case of 6.5MW Muvumbe Hydro Power Plant

Abstract

This project sets out to determine the impacts of integration of Distributed Generation on the local grid stability. Muvumbe Hydro Power plant is introduced as the Distributed Generator, while the case study network is comprised of the Mbarara North – Kabale 33kV Feeder which is under the control of UMEME limited the largest power distributor in Uganda. The case study network is modelled in DIgSILENT power factory version 15 with network data obtained from ArcGIS software and single line diagrams from the network operator UMEME. An analysis of the faults on the case study feeder is provided for the periods before and after the power plant was commissioned in March 2017. The effect of connection of the Muvumbe Hydro power plant and the eventual connection of the proposed 220/132kV high voltage grid extension from Mbarara Substation to Kabale substation through Mirama on the network losses and voltage profile is analyzed. The effect of the high voltage grid extension on the power plant operation is also analyzed. Mitigation measures for the faults on the feeder are also suggested. Simulated results are obtained using load flow analysis, presented and thereafter discussed.