Power System Damping Oscillations in Smib with Pss-Fuzzy Upfc Controller
نویسندگان
چکیده
–Low frequency electromechanical oscillations are inevitable characteristics of power systems and they greatly affect the transmission line transfer capability and power system stability. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Unified Power Flow Controller (UPFC) is a well-known FACTS device that can control power flow in transmission lines. It can also replace PSS to damp low frequency oscillations effectively through direct control of voltage and power. In this paper a liberalized Philips-Heffron model of a (Single Machine– Infinite Bus) power system with a unified power flow controller is considered. The designed fuzzy-based UPFC controller adjusts four UPFC inputs by appropriately processing of the input error signal, and provides an efficient damping. The results of the simulation show that the UPFC with fuzzy-based controllers is effectively damping the LFO. Keywords—Low frequency Oscillations (LFO), Unified Power Flow Controller (UPFC), Fuzzy logic, Damping controller, Flexiable AC transmission System (FACTS)
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Stability Improvement During Damping of Low Frequency Oscillations with Fuzzy Logic Controller
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