Study On Dynamic Modeling And Transmission Experiment Of Wind Turbine Based On Stepless Regulation

As a kind of clean and renewable energy, more and more scientific researchers pay attention and do research on wind energy. Wind power generation is the most common form of wind energy utilization, but more strict reliability and grid-connected requirements have been put forward by electric grid as the percentage of wind power capacity in electric grid is growing gradually. Under this background, based on split-power regulation principle, this paper carries out principle researches and experiment of a non-frequency converter wind turbine with continuous variable regulation by electric powerFirstly, split-power regulation principle, the theoretical basis of stepless regulation wind turbine, and realization mechanism have been introduced which analyzed speed, torque and power distribution and relationship between steering and power flow of three main components of 2K-H differential gear train. The overall structure and mechanism principle of the stepless regulation wind turbine are discussed systematically in this paper. Models of the wind wheel aerodynamic, synchronous generator and the dynamic model of transmission system are respectively developed, which the whole unified electromechanical dynamic model of stepless regulation wind turbine is made of. Combined with research achievements, in the MATLAB/SIMULINK simulation environment, each subsystem of this wind turbine is estimated and connected into the whole to carry out the scheme simulation, and simulated results show that wind turbine with continuously variable transmission system may output high quality electric energy with constant frequency and stable power beyond different wind speed conditions, which verifies the feasibility of transmission regulation scheme.The transmission principle test rig is designed and manufactured according to basic principles of the stepless regulation wind turbine and also introduces its main components in detail. Solidworks, a famous 3-D modeling software, is used to design 3-D models of core CVT components. At the same time, modal analysis of core CVT components is carried out to ensure low frequency stability of test rig by using the finite element analysis software ANSYS/Workbench. To guarantee the precise speed control and design optimal controller and disturbance compensation of servo motor, this paper uses ridge regression method to estimate moment of inertia and damping coefficient of regulation system. Physical simulation by transmission principle test rig indicates that with real-time regulation of servo-motor, permanent magnet synchronous generator connected with output shaft of CVT part may keep basically constant speed by inputting step-changing speed of frequency conversion motor. The overall trend of curve could verify the feasibility of the scheme.