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Stability Enhancement of Multi Machine system with FACTS device SSSC using Fuzzy logic

Author Affiliations

  • 1Electrical and Electronics Engineering, Sri Devi Women’s Engineering College, Hyderabad-500075, Telangana, INDIA
  • 2 Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, Hyderabad-500075, Telangana, INDIA

Res. J. Engineering Sci., Volume 3, Issue (9), Pages 12-20, September,26 (2014)


Continuous demand in electric power system network has caused the system to be heavily loaded leading to voltage instability. Under heavy loaded conditions there may be insufficient reactive power causing the voltages to drop. This drop may lead to drops in voltage at various buses. The result would be the occurrence of voltage collapse which leads to total blackout of the whole system. Flexible AC transmission systems (FACTS) controllers have been mainly used for solving various power system stability control problems. In this study, a static synchronous series compensator (SSSC) is used to investigate the effect of this device in controlling active and reactive powers as well as damping power system oscillations in transient mode. The SSSC equipped with a source of energy in the DC link can supply or absorb the reactive and active power to or from the line. Simulations have been done in MATLAB/SIMULINK environment for IEEE 4 bus system. The Fuzzy controller is used to tune the circuit and to provide the zero signal error. The best Non-linear system performance is seen and however PID controller couldn’t do this sometimes. It was observed that using fuzzy controller, authors could achieve their goals i.e; oscillations damping, fast response and finally stabilizing power system.


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