Transmission Capacity Enhancement for Nigerian Power Transmission Grid using TCSC and UPFC
Abstract
This study aimed to evaluate the application of Flexible Alternating Current Transmission System (FACTS) for enhancing transmission capacity (TC) of existing lines in Nigeria's 330 kV power transmission grid (PTG). Two FACTS devices, Thyristor Controlled Series Converter (TCSC) and Unified Power Flow Controller (UPFC), were considered and their installation modeled. The PTG was modeled as a complex 28-bus system. Load flow in the PTG was carried out using Newton-Raphson algorithm – coded and implemented in MATLAB. Optimal locations of the respective devices were determined using computation of load flow and known sensitivity functions. The required capacities and pay-back-periods (PBP) on the devices were evaluated using PBP and cumulative gain functions. The results show that the TC of the existing PTG can be enhanced by installing a TCSC in Ikeja-Ayede single circuit line and a UPFC in Jos-Gombe single circuit line. PBP analysis showed that investment in TCSC and UPFC will be recouped in about 3 months and 6 years respectively. This assessment shows that TCSC and UPFC can be deployed for improving the TC of Nigeria's PTG effectively.
Keywords: UPFC, TCSC, Optimal Location, Pay-Back-Period, 330 kV Grid
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