Abstract
This paper addresses stability analysis and design issues in load-frequency control (LFC) for interconnected power systems with a structure uncertainty satisfying the matching conditions. A simple robust decentralized control law for each subsystem has been developed on the basis of the Hessenberg model and utilizing the basic concepts of both linear-quadratic regulator theory and Lyapunov stability theory. A detailed design procedure together with simulation results have been presented for the case of the LFC problem of interconnected power systems. The performance robustness and stability bounds are studied and subsequently condition numbers corresponding to the stabilizing solution of the algebraic Riccati equation are also presented.
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