For wind power units

both torque control and pitch control are designed based on generator speed

which leads to the coupling between them near the rated speed

further resulting in rotational speed disturbances.Consequently

conventional torque control will frequently change the control logic according to generator speed

thereby causing the torque and power dips. Besides

two kinds of conventional torque control strategies above the nominal wind

constant-torque and constant-power control

have advantages and disadvantages in torque

power and drive-train loads. In order to eliminate the torque and power dips

full load curve was extended to generator speeds below the rated value. Several state variables

relevant to pitch angle

were selected to reduce the frequency of switching the torque control regions near the rated speed. A new full load curve was designed based on weight programming to comprehensively consider the power and torque performances. The transition curve connecting the optimum Lambda curve and full load curve

was optimized dynamically. Moreover

the proposed control strategy was tested under typical turbulent wind conditions. The simulation results show that

the torque and power dips at above nominal wind are eliminated and the power capture increases at rated wind by using the improved torque control strategy. Furthermore

both torque and power achieves good performance by applying the rational weight.