Research On VSCF And Directly-driven PM Wind Generation System

The paper takes the permanent magnet wind power systems research as the main line, gives the basic principle, the mathematical model of its each component a detailed research and analysis, design the corresponding control strategy, and takes simulation test. Besides I build a complete set of permanent magnet wind power system according to the research for each module, do research for permanent magnet maximum wind power tracking problem and low voltage across problem, and through the simulation results prove the correctness of the system.This paper sketches out the development condition of wind power technology at home and abroad firstly, list several main wind power technology plans at present, Show the wind power's existing technical bottleneck problems and the research direction, and Analyze the basic principle of the direct driving type permanent magnet wind power technology and topology structure.It analyses the basic principles of A wind turbine's absorbing wind power by the way of mathematic calculation, Derive the relationship between the wind machine power and the wind speed,the wind machine speed, Explain the wind machine maximum wind power tracking process, and make a simulation model for the wind machine at lastFirstly it introduces the basic structure of permanent magnet synchronous motor, mathematical model is derived based on the principle of coordinate transformation nudge secondly, and then design the permanent magnet synchronous motor's id=0vector control strategy. Through the simulation I do research the motor's static, dynamic characteristics'both in the electric state and power generation state.It analyses the grid side PWM reversible converter in depth, including the main circuit topology structure, mathematical model, double closed loop control system based on the directional of power grid side voltage vector. Introduces the AC side filtering inductances, DC voltage value, DC side capacitance's selection method, and verifies the correctness of the control system through the simulation waveform.It builds permanent magnet wind power systems mathematical model under the control of double PWM coordination, analyzes the maximum wind power tracking problem of wind turbines under the gradient wind and gust wind. Puts forward the power generation systems solutions when the grid voltage drop, and does research for Permanent magnet power generation system of low voltage across problems apart under single-phase voltage drops and three phase voltage drop. And do the simulation for the above content in the end.Finally, paper introduced the design of the PWM reversible rectifier based on the control of DSP2812.Gives the circuit topology and drive control diagram and software flow chart of the experiment, and it get the more satisfied waveform and results.