Power Flow Analysis and Voltage Stability Enhancement Using Thyristor Controlled Series

Abstract: Power demand increased steadily while the expansion of power generation and transmission has been severely limited due to the inadequate resources and environmental forces. As a result of this, some transmission lines are heavily loaded and the system stability becomes a power transfer-limiting factor. Hence, power flow analysis and Voltage stability enhancement are of paramount essential for a secure power system operation. Presented in this paper is the application of Thyristor Controlled Series Capacitor (TCSC) for power flow analysis and voltage control of Nigerian 330kV grid system. Power flow equations involve solution to nonlinear algebraic equations using mathematical algorithms. In this work, the Newton Raphson iterative algorithm was used for solving the power flow problems due to its ability to converge very fast with small number of iteration. Simulation of power flow solutions with and without TCSC was done using MATLAB 7.90 based programme. Where voltage drops were noticed at the load bus, especially, voltages at buses 9 (Ayede.), 13(New Heaven), 14(Onitsha),and 16(Gombe),TCSC was incorporated to regulate the voltage magnitude at those buses. The application of TCSC improved the voltage profile of the system and furthely enhanced the power flow