Abstract
In this paper, a dual mode linguistic hedge fuzzy logic controller for an isolated wind-diesel hybrid power system with lossy magnetic energy storage unit is proposed. The design methodology is a hybrid model based on the concepts of dual mode control, the linguistic hedges and the hybrid genetic algorithm-simulated annealing algorithms. The system is simulated with the dual mode linguistic hedge fuzzy logic controller and the frequency deviation resulting from the step load disturbance is presented. It is observed from the result that with the application of the proposed controller, the system performance is improved significantly. It has been also found that the proposed controller is less sensitive to the changes in the parameters of the system and also under different operating modes of the hybrid power system.