Research On AC Excited Doubly-Fed Wind Power Generation System

Today, the environmental pollution and energy crisis is increasingly serious, so countries around the world has been emphasis on the development and utilization of wind energy, meanwhile wind power technology has gradually matured. With the continuous increase in installed capacity of wind power, how efficient use of wind and reliable grid-connection has become a hot research in the field of wind power generation.Firstly, analyse the basic running theory of DFIG, deduce its power relations, and the mathematical model in different coordinate, and establish its simulation model, lay the foundation for full-text.Secondly, introduce the basic principle of the grid side converter based on grid voltage-oriented vector control and space vector pulse width modulation technology, at last use simulation to verify its characteristics.Thirdly, starting from the wind turbine characteristics to discuss the maximum wind energy capturing control mechanism of Doubly-Fed wind power generation system, propose to use the generator output power to achieve maximum wind power capture under fixed pitch condition, then focused on analyzing the maximum wind energy capturing control strategy based on stator flux-oriented vector control technology, give the method of calculating the reference power and use the simulation to verify it.In addition, introduce the feature of grid-connection control with no-load and load, deduce the mathematical model of DFIG under the no-load and load grid-connection conditions, and combined with the stator flux-oriented vector control technology, analyze the corresponding control strategy of the rotor-side converter under the two kinds of condition, and also use the simulation to verify it.Finally, in laboratory conditions, completed the grid side converter software and hardware design based on the TMS320F2812 and IPM, and obtain ideal experimental results.Figure [79] table [5] reference [63]...