A comparison of the Voltage Enhancement and Loss Reduction Capabilities of STATCOM and SSSC FACTS Controllers

摘要

Power systems deteriorate with time as load grows and generation is added. The transmission system is also usually subjected to a number of steady-state and transient problems. This leads to voltage instability and increased system losses. This work addressed the problems of voltage instability, active and reactive power losses. Presented in this paper is a comparison of the voltage enhancement and loss reduction capab ilities of Static Synchronous co mpensator (STATCOM) and Static Synchronous Series Compensator (SSSC) at low voltage buses in the Nigerian 330kV grid. Power flow equations involve solution to nonlinear algebraic equatio ns using reliable mathematical algorithms. In this work, the Newton Raphson iterative algorithm was adopted due to its ability to converge after a few iterations. Simulation o f po wer flow solutions without any Flexible Alternating Current Transmission System (FACTS) device (STATCOM and SSSC) and with STATCOM and SSSC were done using a MATLAB based program. Where voltage drops were noticed, STATCOM and SSSC were incorporated in turn and the new voltage magnitudes were computed. The voltage enhancement capability of the devices is thus demonstrated. The system losses were al so computed for each case. Such low voltage buses are buses 9(Ayede), 13(New-Haven), 14(Onitsha) and 16(Go mbe). The results obtained from the incorporation of both devices into the grid system were satisfactory. The voltage magnitudes at these buses were sufficiently improved to maintain it at or above 1.0pu with both STATCOM and SSSC. The active power and reactive power losses also reduced by 0.171% and 1.009 % respectively when STATCOM was applied while the incorporation of SSSC into the N igerian grid system reduced active power and reactive po wer loss by 1.078% and 10.326 % respectively.