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 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 on this system and simulation program is built
to evaluate its effectiveness.