ASSESSMENT OF ENERGY EFFICIENCY OF WIND ENERGY CONVERSION SYSTEM IN MAXIMAL POWER OPERATION USING VAN DER HOVEN’S SPECTRAL MODEL OF THE WIND SPEED

The operation of wind energy units with variable-speed of the wind turbine is considered. The simplified model of the control system in maximum power operation is created. The simulation of the wind energy units operation has been conducted in Matlab. The ability of control system of wind energy units to maintain the maximum power coefficient of wind turbine using Van der Hoven’s spectral model of the wind speed has been estimated. Van der Hoven’s spectral model takes into account power spectral densities and enables the simulation of the wind behaviors by means of mixing of sinusoid with different amplitude, phase and frequency. The criterion of energy efficiency is deviation of the wind turbine power coefficient from its maximum value. Wind turbine characteristics and construction peculiarities of control system have been taken into account while estimating the energy efficiency. The simulation is conducted with different value of the wind speed low frequency components. During the simulation it has been established, that deviation of the wind turbine power coefficient from maximum does not exceed 0,2 %. These results prove the high efficiency of a wind energy unit in the maximum power mode under any wind conditions.