Reduction of Transient Voltage Instability of High Voltage Transmission Network Using Unified Power Flow Controller (UPFC)
Abstract
Ideally, we would expect a Kampala Metropolitan High Voltage transmission network to be
stable even if there is a transient voltage disturbance. However, due to lag in the network
development, the existing high voltage transmission network operates at the margin of its
capacity and experiences many power system losses due to transient voltage instability on
the transmission line. According to UETCL, the transmission network will lack capacity in
medium-term (10-15) years due to the load profile growth rate. [1] [2]
This project's general objective is to model and evaluate the impact of the Unified Power
Flow Controller in the reduction of transient voltage instability of the Kampala Metropolitan
High Voltage Ring Network.
This objective was achieved by collecting the electrical parameter from UETCL, modelling
the Kampala Metropolitan High Voltage Ring network, modelling UPFC, and performing
load flow and transient analysis.
The project found out that Kampala metropolitan High Voltage Ring network operates at
the margin of its capacity that is voltage level of average 0.95pu and unstable during a
transient. With UPFC installed, the voltage level is regulated towards 1pu, the network
response faster and dumps transient, and there is a reduction in line loadability.
The project concluded that UPFC provides an advanced and economically viable solution
to the transient disturbance in Kampala metropolitan High voltage ring network and
recommends UPFC to solve the transient voltage disturbance, line congestion, and voltage
compensation