Improved Under-Voltage Load Shedding Scheme in Power System Network for South Eastern Nigeria

Abstract

This paper presents an Improved Under-Voltage Load Shedding
Scheme in Power System for South Eastern Nigeria distribution
network. The south eastern Nigeria distribution network was first
modeled and its load flow regenerated using Newton Raphson
iterative load flow method for all 203 load buses in the network. The
aim is to improve the existing network’s bus voltage profile with the
use of various under-voltage load shedding schemes for improved
power and its effect of the system voltage profile was analyzed and
recorded for 100%, 60% and 50% load shedding case studies.
Results showed an improvement in the entire network bus voltage
level after the load shedding scheme between 10.34 kV to 11.22 kV
for 11 kV buses and between 31.02 kV to 33.66 kV for 33 kV buses
indicating the nominal voltage level. It showed an increment in the
total number of nominal voltage buses of each case study, from 22
buses at 100% load demand to 105 buses when 40% of the load has
been shed to finally, 126 buses when 50% of the load has been shed
in the 50% load demand scenario A and B. Finally, the number of
under-voltage buses decreases to 3 and 7 buses in Scenario A and B
respectively when 50% of the total load demand has been shed by
Enugu Electric Distribution Company (EEDC).