| dc.description.abstract | Siti 1 (6.2 MW) and Siti 2 (16.5 MW) are off grid hydro power plants (HPPs) situated along
a Kwen-Bukwo-Suam UEDCL line, which is along the Mbale-Kumi 33kV Kapchorwa T-Off
network in Bukwo District in Eastern Uganda. The grid network in Kapchorwa region currently
experiences poor voltage regulation exceeding the allowable ±10%. However, evacuation of the
plants on the distribution network would create an impact on the distribution network due
to associated benefits which include; improved voltage profile, improved power quality and
reliability among others, necessary for financial sustainability of the power sector.
The purpose of this research is to assess the feasibility of integrating siti mini hydros onto
the main grid and its benefits. To achieve the project objectives, the neighboring distribution
network was studied to identify the possible options for interconnecting the above hydro power
plants (HPPs). The grid simulation model for the 33kV network between Tororo main, Mbale,
Kumi, Bulangira, Nangogera and Bubulo substations was developed using DIgSILENT power
factory 15.1 version. Load flow analysis was performed on the network before interconnecting
the HPPs. Loadings for different feeders were compared with those obtained from UMEME limited, to ensure accuracy. The bus voltages for different busses were determined before and after
interconnection of the HPPs at different points on the network. Grid losses and feeder loadings
were also determined for the different interconnection options and a cost benefit analysis made
to assess the different options. Interconnection of the HPPs at Mbale substation yielded stable
bus voltages at all buses with the lowest payback period. However, an interconnection at Mbale
substation in an island mode had the lowest line losses, it was unable to evacuate the whole of
22.7 MW onto the distribution network.
In conclusion, an interconnection of HPPs at Mbale substation provided stable and reliable
power and reduced on feeder loadings thus improved power quality and reliability to the final
consumer and improved security of supply as well was positively impacting the financial status
of the energy sector in Uganda. | en_US |
