Despite the government huge investments into the power sector, to adequately ensure regular power supply
to electricity consumers, there are still gross inadequacies on the regularity of electricity in the country.
This paper analyses the use and impact of Distributed Generation (DG) on regularity and quality of power
supply in Nigeria and Imo State in particular. Gas turbine was the DG considered due to its availability and
significant impact it could make on network. A 12-bus network in Imo State namely: bus 1 (Alaoji), bus 2
(Onitsha Road), bus 3 (Ahaoda), bus 4 (Egbu 1), bus 5 (Owerri 1), bus 6 (Okigwe Road), bus 7 (Owerri 2),
bus 8 (Oguta), bus 9 (Orlu), bus 10 (Mbaise Road), bus 11 (Port Harcourt Road), bus 12 (Onitsha Road)
was considered and 25MW DG was individually connected on these buses alternatively and their network
conditions assessed for voltage violations, losses, maximum loading factor, etc. This was repeated for
simultaneous placement of 2 DGs and 3DGs on the 12-bus network and the buses conditions observed as
was done for single DG placement. The results indicated that single DG placement or installations recorded
losses in all the 12 buses however, the least was on bus no. 5 (Owerri 1). The best result on loadability was
recorded at bus 7 (Owerri 2), with minimum loss recorded at bus 5 (Owerri 1). Simultaneous addition of
2DGs on the network and subsequent dynamic stability test revealed that bus 2 (Onitsha Road 1) and bus 3
(Ahaoda), bus 2 (Onitsha Road) and bus 4 (Egbu 1), bus 2 (Onitsha Road 1) and bus 7 (Owerri 2), bus 3
(Ahaoda) and bus 10 (Mbaise Road); bus 4 (Egbu 1) and bus 11 (Port Harcourt Road), bus 5 (Owerri 1)
and bus 10 (Mbaise Road), bus 7 (Owerri 2) and bus 11 (Port Harcourt Road), gave violations of 5 and
buses 3 (Ahaoda) and 5 (Owerri 1), 3 (Ahaoda) and 11 (Port Harcourt Road) gave violation of 7. However,
when 3DGs were simultaneously added to the network at three buses and the network conditions assessed:
the best were observed as buses 5 (Owerri 1), 7 (Owerri 2), and 11 (Port Harcourt Road). At these buses,
the network recorded no voltage violation, high loading factor of 1.160 pu, little loss of 0.02355 for normal
load flow while at collapse point, it was 0.07019 pu. In conclusion, placement or location of 3 DGs at buses
5 (Owerri 1), 7 (Owerri 2) and 11 (Port Harcourt Road) gave the network, the best condition and
performance.
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