Power Flow Analysis of the Nigerian Transmission System Incorporating Facts Controllers

This paper presents the results of power flow analysis of Nigerian power system incorporating Flexible AC Transmission Systems (FACTS) controllers such as Static Synchronous Compensator (STATCOM), High Voltage Direct Current- Voltage Sourced Converter (HVDC-VSC) and Unified Power Flow Controller (UPFC) for voltage magnitude control, active and reactive power flow control. The FACTS controllers power injection models with the voltage expressed in rectangular form were presented in this work. The steady-state models of the FACTS controllers produced algebraic equations which were combined with power system network algebraic equations and these were solved using Newton-Raphson solution technique. A MATLAB based program, Flexible Alternating Current Transmission System Power Flow (FACTSPF) for steady-state analysis of power was developed. Power flow analysis of the Nigerian transmission system conducted confirmed results of earlier works that the system is weak with voltage limit violations and high power losses. Application of the FACTS controllers resulted in the voltage profile of the system being brought within acceptable limit of