Blade Load Control of Wind Turbine Based on Variable-pitch Control Strategies
نویسنده
چکیده
The control strategies of blade loads are proposed for the characteristics of blade stresses of variable-speed variablepitch wind turbine. Blade loads are divided into two static and dynamic components. The pitch angle and generator torque are controlled by Single neuron PID controller in the static part. Variables are converted from rotational coordinate to fixed coordinate through multi-blade coordinate transformation theory. Then, the control parameters obtained are converted to the one in rotational coordinate frame via multi-blade inverse transformation in the dynamic part. The parameters of static part are added to the parameters of dynamic part, yielding control value for wind turbine pitch control. The external controller of Bladed is designed and the control strategies are simulated by the professional design software Bladed for wind turbines. The control performance of external controller is compared with and that of internal controller. Simulation results show that external controller can reduce the tilt torque of blade root and blade flapwise torque. Thus the proposed external controller possesses a better performance, the correctness of the proposed blade load control strategies is verified.
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