In present scenario, the performance of power systems decreases with the size, the loading and the complexity of the system networks. This is related to problems with power oscillations, large power flow and voltage instability with inadequate control, so the power flow control plays a major role in power systems. In this paper SSSC series FACTS device are regulates system voltage by absorbing or generating reactive power and the control of active, reactive power flow and voltage well as damping power system oscillations in long transmission line. In this paper results of SSSC series FACT device compared with the STATCOM shunt FACT device and Simulation studies were carried out in the MATLAB simulation environment to observe the compensation achieved by the SSSC device. The system parameters such as voltage, current, active power and reactive power transmissions are observed when the SSSC, STATCOM device is connected to the power system. For the simulation purpose, the model of two-area four-machine 11-bus system with SSSC and STATCOM device is developed in MATLAB/SIMULINK using Simpower System (SPS) blockset.
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