Wind Turbine Output Characteristics Of Wind Power Generation System Simulation And Control

Wind power,as a renewable energy,is an important alternative energy resource and plays an important role in increasing energy supply,improving energy structure,ensuring energy security and protecting environment.It is of great importance to all countries in the world and a key industry of new energy development in China.Since there are many adverse factors with the field test,indoor simulation for Wind power generation system becomes one of most effective means.Wind power generation system converts kinetic energy of wind into power output by using a wind turbine blade;This paper simulates the speed and torque characteristics of wind turbine which is important to provide experimental condition for improving the utilization of the wind energy and the follow-up transition of mechanical energy to electrical.This paper proposes a method to imitate the actual output characteristics of wind turbine by using direct torque controlling asynchronous motor.By using this simulator to drive a generator,we can make wind power technology research.After analyzing the advantages and disadvantages of a variety of wind models,a model of combined wind was established.Compared the simulating wind speed curves with the actual wind speed dates,a conclusion could be drawn that the wind model had its accuracy and feasibility. Wind turbine aerodynamic characteristic was analyzed and wind turbine model was established by which we could achieve the corresponding rotational speed,power and torque when giving a certain wind speed;Based on the detail analyzing of asynchronous motor direct torque control,wind turbine output characteristic simulating system was designed using established wind speed model and wind turbine model;Induction motor stator flux model was optimized,and a method of torque ripple minimization was proposed.The time of switching state vector was optimized using duty ratio control technique,which greatly minimized the torque ripple.Analyzing the most power point tracking theory and proposing a arithmetic of the most power point tracking on the base of traditional MPPT control arithmetic,which make the power varied with the wind speed and maintain a best effectiveness.