The Research On Control System Of VSCF Doubly-Fed Wind Power Generation

The shortage of conventional energy and power has become increasingly prominent issues. The use of renewable energy, such as wind, Which will be one of the most important clean energy in the future, have extraordinary significance for easing energy shortage. With the wind turbine capacity increasing, improving the operating efficiency and increasing the utilization rate of wind energy have become an important part of research in wind power technology. The theme of this thesis is the operation and control of VSCF doubly-fed wind power generation system, with a comprehensive and in-depth theory analysis and simulation.First, the article analyzed DFIG characteristics and theory, deduced the equivalent circuit and coordinate transformation and mathematical models and relationship of power flow. Second, the article introduced a wind machine characteristic, had an important parameter C pof wind turbine, and determined the program of VSCF wind power generation system of capturing the largest wind energy in the case of fixed blades pitch. The program used stator flux-oriented vector control technology, achieved lotus solutions of active and reactive power, and established a vector control model of DFIG. Third, the paper analyzed doubly-PWM converter features and the difference between rotor side and grid side converter. Focused on grid voltage-oriented vector control technology, it was achieved grid side converter unity power factor and DC bus voltage constant. Last, this paper used MATLAB/SIMLINK to establish wind turbine and doubly-PWM converter and two control modules, as well as the overall system simulation model. The simulation parameter was settled, and the results tested that model as well as control system was good or bad.