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This work presents an approach to design a load frequency controller (LFC) for power systems with steam turbines. The goal is to damp the oscillations of the output frequency deviations as fast as possible. The design is based on the polynomial H_∞ robust control theory. The robust governor is synthesized by assuming parameter’s variations, negligible dynamics, and a constant main steam pressure. The proposed controller will adequately ensure the internal stability and the robust performance of the closed-loop system. The closed-loop control system is tested by subjecting the system to different disturbance signals to show the robustness characteristics, and the well damping of the output frequency under parametric perturbations. The simulation results point out that the system performance is substantially improved.