Research On Maximum Power Tracking Control Methods Of Wind Turbine

Wind energy is clear and renewable energy. Wind power is known as the fastest developing green power. Maximum power tracking control methods of large scale permanent magnet direct drive wind turbine are discussed in this paper. Its primary coverage is as follows:The composing and working principles of wind turbine are introduced at first. Maximum power tracking control methods and three commonly used maximum power tracking control algorithms are studied and analyzed, including using tip speed ratio to control, using maximum power curve to control and hill climbing algorithm.In order to solve the problem that the exactly wind speed can not be measured using tip speed ratio control, a new algorithm is introduced. Backward verification is used in this algorithm to obtain the wind speed and control based on the features of large wind turbine to achieve exactly tip speed ratio control.Because the experimental environment is not provided with, in order to verify the maximum power tracking control algorithm, the model of 1.5 MW permanent magnet direct drive wind turbine is built in MATLAB/SIMULINK, including rotor model, permanent magnet generator model and the control system model. A backward verification method is used to calculate wind speed and control the output power below the rated wind. The control results are verified by simulation.As large wind turbine has the features of time-varying, nonlinear and large time delay, fuzzy adaptive PI controller is introduced in the rotor speed loop. The controller is designed and simulated in MATLAB/SIMULINK. Simulation results show fuzzy adaptive PI controller get better control effect compared with ordinary PI controller.