Design and implementation of class of robust H infinity control for stability enhancement in power systems

The paper presents a method of designing a class of robust H-infinity gener ator excitation controller in a power system. The proposed controller is ut ilized to damp inter-area oscillations and enhance pourer system stability. The robust controller design procedure for a linear composite system is pre sented in terms of positive definite solutions to modified algebraic inequa lities. The resulting controller guarantees closed-loop stability and an H- infinity-norm bound on disturbance attenuation. The effectiveness of the H-infinity controller is demonstrated through digi tal simulation studies on a two-machine system. The digital simulation stud ies are conducted using a PSCAD/EMTDC software package. The simulation results show that the controller contributes significantly t o the damping of inter-area oscillations and the enhancement of power syste m stability during disturbances.