Wide-area controller design for two area power systems using robust control

Abstract

Low-area frequency oscillations are one of the major problems in the present power systems for smooth and reliable operation where power is essential to transfer from one area to another remote area through weak tie-lines. This kind of oscillations problem may result into system instability, cascade failure and even in blackouts, if they are not damp out quickly. It have been observed that local mode of oscillations can be damp out by using Power System Stabilizers (PSS) but damping inter-area mode of oscillations using PSS may not be possible always. This thesis work deals with the designing of Wide-Area Power System Stabilizers (WPSS) to damp inter-area mode of oscillations using wide-area signals. The Eigen analysis is used to verify the local and inter-area signals presented in two area power systems. H_‡ Mixed-sensitivity synthesis method for robust control is used to design Wide-Area Power System Stabilizer (WPSS). It is observed that designed WPSS is able to damp inter-area mode of oscillations presented in two area power systems.