APPLICATION OF UPFC FOR OPTIMIZATION OF THE NIGERIA ELECTRIC POWER SYSTEM
1Madueme T. C & 2Onyegbadue Ikenna A.
1,2Department of Electrical Engineering
University of Nigeria Nsukka
Email: augkey2002@yahoo.com
Corresponding author: Onyegbadue Ikenna A.
ABSTRACT
In this work, the optimization of power flow of Nigerian 330kv network was conducted. The optimization was achieved by the simulation of a Flexible Alternating Current Transmission System device (FACTS) called the Unified Power Flow Controller (UPFC) on the 330kv Nigerian network. A load flow analysis was first carried out on twenty-six buses, eight generators and twenty-nine transmission lines of the 330kv network of Nigerian power system. The load flow analysis was done using three techniques which included Newton-Raphson, Gauss-Seidel and Fast decoupled load flow (FDLF) in a Matlab 7.5 based program. FDLF was confirmed to be the fastest with a convergence time of 0.02 second after twenty eight iterations and hence recommended for this work. Gauss-Seidel technique failed to converge even after 1000 iterations. The bus voltages as well as line losses were obtained from the analysis. System Line Overload Index (SLOI) analysis was also carried out to determine overloaded lines. The branches identified for the simulation of UPFC in order to optimize the 330kv network include; Kainji-Jebba TS-Oshogbo, Oshogbo-Ikeja West, Oshogbo-Aiyede, Egbin-Delta GS, Shiroro-Afam, Jos-Gombe and Benin-Onitsha. The simulation of UPFC increased the maximum power transferred to the lines considered. Kainji-Jebba increased by 0.688%, Jebba TS-Oshogbo had an increase of 7.552%. Egbin-Delta GS had an increase of 38.12% which is the highest. The simulation of UPFC also increased the voltage magnitude of the buses at the receiving end of the transmission lines. The technical benefit derivable from the simulation of UPFC in Nigeria power system has been demonstrated in this work. The simulation of UPFC resulted in an optimization of Nigerian power system.
Keyword: Flexible Alternating Current Transmission System, Unified Power Flow Controller, System Line Overload Index, Load Flow, Gauss-Seidel, Fast Decoupled load Flow.
