Abstract
M.Phil.
The Motraco transmission system is a classical case illustrating the increase in
power transfer of a network considering the possibility of a voltage collapse. This
case study was used in the dissertation to find a techno-economical solution for
the Motraco system to increase the power transfer to satisfy an additional load.
The Motraco power system is operating close to a voltage collapse at present. A
voltage collapse will be experienced if additional load is added at the Maputo
substation. The possibility of a voltage collapse can be reduced if the power
transfer capability of the Motraco power system is increased. Various
technologies can be used to increase the power transfer of the Motraco power
system. The technologies used in this study to increase the power transfer were
limited to the following:
• Adding shunt capacitor banks at critical locations in the network
• Adding a series capacitor bank on an existing 400 kV transmission line
• Adding an additional 400 kV transmission line
• Adding a series capacitor bank on the new 400 kV transmission line
The correct use of the combination of the shunt capacitor banks, series capacitor
bank and the new transmission line contributes to:
• support voltages in the network;
• reduce the transmission losses; and
• increase the fault levels at the receiving end.
The principles used in this dissertation can be used to increase the power
transfer limit of any power system with the same characteristics.