IMPROVING THE STEADY STATE STABILITY OF 400KV TRANSMISSION GRID USING A STATIC SYNCHRONOUS SERIES COMPENSATOR

With the rising demand for electricity nowadays and the displacement of generation stations from the load center connected via long electrical lines, it is important to increase the power transfer capability of the transmission lines. The power system may reduce the amount of power that is transferred to the system via long lines which thus contributes to voltage instability under heavy loading conditions. Flexible AC transmission system (FACTs) devices can improve the transmitted power along with minimizing the transmission systems losses. In this paper, a Static Synchronous Series Compensator (SSSC) is proposed to be used in Oman Electricity Transmission 400KV grid section to enhance its performance. A simulation has been performed in PSAT for this case study. The continuation power flow analysis is carried out on the grid section under consideration without SSSC to study and analyze its power-voltage (PV) curves. The best possible location for the proposed SSSC installation is determined after comparing the simulation results obtained with SSSC placement in four different lines of the grid section. The results show the voltage profile improvement on all busses along with the total power losses reduction. Moreover, from the nose curve obtained it is clear that the maximum loading capability of the grid is improved. A profound improvement in the steady state stability of 400kV MIS grid is thus achieved by using SSSC.