TUNING OF POWER SYSTEM STABLIZER FOR SMALL SIGNAL STABILITY IMPROVEMENT OF INTERCONNETED POWER SYSTEM

Electrical Engineering

With the development of electric power system and continues interconnection of regional electric grids, the stability problem becomes more complex in nature, especially low frequency oscillation which play an important role to influence the stability and efficient operation of inter connected grids. The low frequency oscillations in the power system network especially the inter-area oscillations (0.1 to 1 Hz) is the key factor that influence the stable operation of interconnected grids and limits the transmission capacity of large-scale power system. Inter-area oscillations mainly represent the power oscillations among different generators located in different area of power systems. In the local control strategies adopted, local control signals for the controller can’t achieve the effective damping control for these inter-area oscillations.. The selection of most suitable stabilizing feedback signal to the wide-area controller is the key objective of the controller design. In this dissertation two different methods of signal selection for wide area damping controller of power system have been exercised with emphasis on damping of critical inter area mode.

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