Losses Reduction in the Yendi-Bimbilla-Kete Krachi Power Sub-transmission Line Using One of Two Flexible AC Transmission System Devices

Rapid rate of development in modern times, proliferation of more sophisticated electrical appliances and expansion of industries call for increases in electric power generation and upgrading of sub-transmission networks. This paper investigated the power system of the Yendi- BimbillaKete Krachi sub-transmission line with regard to voltage stability and power losses. To achieve this, the sub- transmission line was modelled and simulated using NEPLAN V543 software. Base case simulation results indicated a drop in voltage below the Public Utility Regulatory Commission (PURC) acceptable limits giving rise to the use of Flexible Alternating Current Transmission System (FACTS) technology. This came in handy to improve power system performance of the sub- transmission line without altering its size or the number of circuits. Deploying Static VAr Compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC) onto the network, power system constraints of voltage instability and higher power losses reduced appreciably. Out of six scenarios considered, installation of 2.6 MVAr SVC at Bimbilla gave an average voltage improvement of 6.34%, 22.43% reduction in active power losses, and 66.89% improvement in the reduction of reactive power losses over the respective values of base case. By way of recommendation, 2.6 MVAr of SVC should be incorporated at Bimbilla for effective voltage profile enhancement and losses reduction.