| Wind energy has great value for both theoretical and applied research among the development and utilization of the renewable energy. Wind power has been the practical choices for the substantial development of national electric power and energy.Large grid-connected wind farm is the effective way for the utilization of wind energy in large scale. The wind power is changed following the wind speed, therefore the large fluctuating wind power are flowing into the power grid. That will cause some adverse effect to the operation and stability of power grid, as the rating of wind power in the power network rises, the fluctuating of grid-connected wind power should be urgently resolved.Firstly, the lack of the current wind power system are briefly analyzed in this paper, a kind of flexible wind power generation system are proposed, this system is base on the double fed wind power generators with appropriate NaS battery energy storage system configuration.Secondly, this paper discusses the double fed generators control. A vector control model of double fed generator is established in this paper. The control target, control model and realization method of double fed generators excitation control are mainly studied. It concludes that using vector control can realize decoupling control of active power and reactive power of double fed generator, maximal wind energy can be captured while operation.Besides, a power control of Four-Quadrant Inverter mathematical model considering the energy storage system is established, the theory of the exact linearization via feed back is mainly studied to realize decoupling control of active power and reactive power controlled by Four-Quadrant Inverter. Using this control method, smoothing up the fluctuating grid-connected wind power control c is mainly studiedThe given flexible wind power generation system operation is simulated and the feasibility of smoothing up wind power output fluctuation is primary discussed in this paper. |
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