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

The paper presents a method of designing a class of robust H-infinity generator excitation controller in a power system. The proposed controller is utilized to damp inter-area oscillations and enhance pourer system stability. The robust controller design procedure for a linear composite system is presented in terms of positive definite solutions to modified algebraic inequalities. 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 digital simulation studies on a two-machine system. The digital simulation studies are conducted using a PSCAD/EMTDC software package. The simulation results show that the controller contributes significantly to the damping of inter-area oscillations and the enhancement of power system stability during disturbances.