The Magnetomotive Force Analysis For Brushless Doubly-Fed Wind Power Generator

In recent years,with the development of the industry and the policy guidance,the wind power industry has made considerable development,because of its clean and sustainable features more and more be taken seriously,not only effectively solve the tension in electric power,and in improving the haze serious condition plays a positive role.Renewable energy sources such as wind power has the characteristics of wide distribution,low density,more suitable for local development,on-the-spot use.In the load center of eastern and southern regions of large-scale development of wind power project conforms to the endowment of renewable energy.And through the "twelfth five-year" period of technology innovation,enhancing the overall efficiency of the unit,low wind resource area also has the value of economic development."Much starker choices-and graver consequences-in" is our energy structure optimization adjustment,accelerate energy revolution.So far,direct-drive permanent magnet wind turbine in wind power market,the vertical axis wind turbines,doubly-fed variable speed constant frequency type units,such as the highest market share for doubly-fed variable speed constant frequency generator.Brushless doubly-fed machine(Brushless Doubly Fed Generator,BDFG)it is in ordinary doubly-fed induction Generator based on the theory of extended to the electricity output constant frequency constant pressure,because of the unit itself without carbon brush and carbon brush holder,slip ring,conductive rod,and greatly reduce maintenance costs and other advantages to get recognition of the industry;It also has the doubly-fed variable speed constant frequency excitation regulating characteristics of motor,can maximum limit will wind energy into electrical energy.In this paper for brushless doubly-fed generator as the research object,through to the generator mathematical model magnetomotive force energy change.First,an introduction to the status quo and the development status of wind turbines,with BDFG run advantage,development prospects and the research status at home and abroad are described.Second,the structure principle of BDFG power generation as well as a detailed analysis of energy change,by changing the parameters of the rotor side of the converter to change the stator side output power,thus achieve constant frequency;Establish BDFG motor in d-q rotating coordinate system,the mathematical model and use the MATLAB software simulation,prove the validity of the magnetomotive force change.Finally,a mathematical model based on MATLAB software,the assignment of model parameters,the mathematical model and the changes of external conditions,change fan simulation in real co nditions under the condition of implementing change.