Frequency control of wind penetrated hydro-dominated power system

The increasing penetration of variable speed wind turbines in the power system result in the reduction of total system inertia. This requires new methods to control the grid frequency. This paper deals with the primary frequency control of hydro power dominated power system integrated with wind power. The modeling of hydro power units and variable speed wind turbine are done in Matlab/Simulink. The behaviour of grid frequency for various wind speeds and wind penetration levels is analysed when there is a power imbalance. A fuzzy logic based pitch controller is proposed for high wind speed range. Inertia emulation frequency control is added to the wind turbine to improve frequency stability when there is a mismatch between load and generation.