Research On Large-scale Wind Turbine Pitch Control System

With the development of modern industry the enormous energy consumption and serious environmental pollution gradual emergence make the traditional energy shrinking depletion. A pressing matter of the moment is to find and study the use of renewable green energy for the sustainable development of human society. As an important form of renewable green energy, wind power generation is gradually improving in the energy supply ratio. Along with the increasing of the unit capacity of wind turbine, the size of wind turbine is also increasing, the focus of many scientific research institutes is how to improve the stability of the output power and reduce the wind turbine loads. In this paper, we will study mainstream large-scale double-feed variable pitch wind turbine and finish the design of 3D Fuzzy individual pitches system through the simulation of mathematical models of wind turbine test the feasibility of the control scheme and solve these problems.Firstly, before we study variable pitches system the development of wind power and wind power generation technology should be analyzed. The paper elaborates on the wind turbine components, working principle, variable pitch principle and the aerodynamic theory, so that we can build mathematical models for each unit of wind turbine. Combination of each unit and designing wind turbine model and PID controller complete the Matlab simulation model of collective pitches controller and from the simulation results imply the reasonable of variable pitch control system. In order to decrease the wind turbine loads, making sure the PBD collective pitches system can stabilize the output power before design the Matlab simulation model of PID Individually control blades on the basis of the weight coefficients of blade azimuth angles individual pitch control. Contrasting with the simulation results of the collective pitches control systems, the individual pitch control has a great advantage in reducing the load of wind turbine. The effect of traditional control system is not very perfect as the great nonlinearity of wind turbine and the improved 3D Fuzzy power control scheme is proposed to enhance the accuracy of wind turbine power control. The 3D fuzzy control scheme is feasible when compared with the simulation results of Fuzzy individual pitch control. Making sure the wind turbine loads have abated, the improved 3D Fuzzy individual pitch control can effectively improve the stability of the output power control system. In general, the improved 3D fuzzy individual pitch wind power system can improve the output power of the system stability and reduce the wind turbine loads making the large-scale development of wind turbine possible and safety.