Implementation of PSS and STATCOM Controllers for Power System Stability Enhancement

In emerging electric power systems, enlarged communication often lead to the situations where the structure no longer remains in secure operating region. The flexible Ac transmission system (FACTS) controllers can take part in an important role in the power system security enhancement. However, due to high capital investment, it is necessary to locate these controllers optimally in the power system. This paper presents an application of fuzzy control to determine the control signal of static compensator (STATCOM) for improvement of power system stability. STATCOM is a shunt type FACTS device which is used in power system primarily for the purpose of voltage and reactive power control. A fuzzy logic based supplementary controller for Static Compensator(STATCOM) is developed which is used for damping the rotor angle oscillations and to improve the transient stability of the power system. Generator speed and the electrical power are chosen as input signals for the fuzzy logic controller (FLC). A Standard 3-phase, six bus system is taken as test system to evaluate the FACTS device (STATCOM) performance for proposed controllers PI and fuzzy with Power System Stabilizer in multi machine system.