Enhancement of voltage stability in transmission system using SSSC

Abstract

Reactive power control is the basic requirement for maintaining the voltage levels thereby the stability of the interconnected power system. Voltage stability is the ability of the power system to maintain steady acceptable voltages at all buses in the system under normal operating conditions and after being subjected to a disturbance (reactive power balance). Modern power systems are at risks of voltage instability problems. The main cause of voltage instability may be due to the shortage of reactive power in power system. The voltage stability can be improved by increasing the reactive power. Many approaches used to prevent voltage instability, such as Placement of FACTS Controllers, Placement of series and parallel capacitors, Rescheduling of the generation, Under-voltage load shedding. The placement of FACTS controller can improve the voltage stability. Static Synchronous series compensator (SSSC) can increasing or decreasing the overall reactive voltage drop across the line and thereby controlling the transmitted electric power. The bus voltage magnitude will increase with the use of SSSC. In this work, the Newton Raphson iterative algorithm was adopted due to its ability to converge after a few iterations. Simulation of power flow solutions without and with SSSC was done using MATLAB based programme. The model is validated on IEEE 30-bus system.