This work is intended to design a new robust load-frequency controller for
Iraqi National Super Grid System with uncertain parameters. Riccati equation
approach to the stabilization of uncertain system is proposed. Robust controller that
ensures stability of the closed-loop system for all admissible structured uncertainties
is designed. ‘Matching conditions’ and Lyapunov stability theory are used to
implement a robust stabilizing controller. Participation factor is used to address the
interaction between the state variables and the modes in the power system. This
property is used to choose weighting matrix of the state variables (Q). A linear, time,
invariant mathematical model is derived for Iraqi National Super Grid System
consisting of six generating stations with various types of turbines. The proposed
approach is applied to this system and simulation program is built to evaluate its