ROBUST POWER-SYSTEM LOAD FREQUENCY CONTROLLER-DESIGN BASED ON H-INFINITY-OPTIMIZATION APPROACH

An H infinity controller based on the standard H infinity control design approach is proposed for power system load-frequency control with system parametric uncertainties. The variation bounds of power system parameters are obtained by changing parameters by 30%-50% simultaneously from their typical values. The existing H infinity control technique is applied to design a load-frequency controller for power systems. The design procedure is given. The proposed H infinity controller is simple, effective and can ensure that the overall system is asymptotically stable for all admissible uncertainties. Our simulation results show that for the example system the proposed H infinity load-frequency controller can achieve good performance even in the presence of generation rate constraint.