Research On The Individual Blade Pitch Control Of The Floating Wind Turbines

Energy crisis and environment pollution problem increasingly prominent, and it has become a lot of countries, especially developing countries the bottleneck of the economic and social development in the world, the development of wind power and other renewable clean energy to promote sustainable development of the global economic and social health is particularly important. At present, the wind energy of the land utilization technology has relatively mature and its development also gradually tend to be saturated, offshore wind which both familiar and unfamiliar territory of course become a new hot spot of the current wind power development. Although the offshore wind turbine machine technology and onshore wind generating is roughly same, but the floating wind turbine control technology is a new field, facing many difficulties, and the current research at home and abroad few studies.This paper uses the floating wind turbine as the research object, designing control strategy based on the dynamic simulation of MATLAB Simulink module, and finally cooperate with FAST so ftware realize the simulation of the whole process, considering the linear characteristics of wind turbine, we proposed the independent variable pitch control(IBP) based on sliding mode control of floating platform offshore wind turbine; Better in order to be able to verify the validity of the model,, under the condition of the stability of the wind and turbulent wind conditions, we use comparative simulation to the floating offshore wind turbines wind turbines based on the collective pitch control, based on the independent blade pitch control of PI control, and based on the independent blade pitch control of the sliding mode control respectively, the experimental simulation results show that the offshore wind turbines of based on the independent blade pitch control of PI control as well as based on the independent blade pitch control of sliding mode control can be independently adjust the pitch angle of the blade in the wind turbines, not only makes the output of the wind turbines in stable state, but also the offshore wind turbines of based on the independent blade pitch control of sliding mode control has obvious advantages in which reducing yaw and pitch moment of wind turbine and root moment of the blade in the out-of-plane, relative to based on the collective pitch control, based on independent blade pitch control of PI control, the offshore wind turbines of based on the independent blade pitch control of sliding mode control will make the system load decreased by 12%, which is higher than the collective pitch control by nearly 75%, and which is nearly 51% higher than that the independent blade pitch control of based on PI control. Therefore, the offshore wind turbines of based on the independent blade pitch control of sliding mode control enhance the overall performance of the offshore wind turbines more effectively.In order to accurately control the system, the offshore wind turbines of based on the independent blade pitch control of sliding mode control obviously can’t meet the requirements. To solve this problem, combined with the existing simulation tools, we has made the corresponding adjustment on the basis of the theory and practice, so we proposed the control strategy of the offshore wind turbines of based on the independent blade pitch control of nonlinear model prediction control. The core problem of the strategy is how to design the controller based on the nonlinear model predictive. Based on the designed controller, under the close to the real random wind speed, we make a series of simulations to the offshore wind turbines, which respectively based on the basic controller, based on the PI controller and based on independent blade pitch control of nonlinear model predictive controller for the comparative simulation. Results show that based on the nonlinear model predictive controller significantly reduces blade load of the offshore wind turbine, in contrast to the independent blade pitch control method based on sliding mode control, based on the nonlinear model predictive controller can make blade load of the offshore wind turbines reduced by 17%, and finally we achieved the expected effect.This paper relying on the National Natural Science Foundation, Project number: 51267017, Project Name: Research on the effects of power quality of the wind turbine of megawatt which induced by independent blade pitch technology.