The Research Of Wind Power Generation System Based On DFIG

Energy is the important support of economic development. Conventional energy has coal, oil, natural gas, which is limited resources and cause serious air pollution. The development and utilization of renewable energy has received worldwide attention, efficient use of wind energy is one of the key. Information technology, power electronics technology and intelligent control technology is developing rapidly, which provides the prerequisite for the high performance of wind power generation system. Doubly-Fed Induction Generator (DFIG) with high conversion efficiency and strong ability to capture wind energy and other advantage, become the current international mainstream generator of wind power generation system. Therefore, the research of wind power generation system based on DFIG has a high theoretical and practical significance.This paper analyzes the working principle of DFIG, the mathematical model of DFIG under synchronous rotating coordinate system and coordinate transformation theory. Research on voltage space vector control strategy of wind power generation system based on DFIG, deduced the mathematical model of connecting to the grid with no-load and load, active power and reactive power control and the grid-side converter. And then build simulation models based on Matlab Simulink platform. During the grid voltage from fall to recovery, stator current, stator voltage, stator active power and reactive power of DFIG were simulated. Under the power grid voltage stability condition, simulated the current active and reactive component of the grid-side converter side independently. The simulation results show that the wind power generation system can connect the grid smoothly in this control method, from the dynamic performance of generator , it is capable of traversing on the certain degree of voltage drop, the decoupling control effect about current component of the grid converter side is good. The simulation results achieve the expected control goal, it lays a solid foundation for follow-up research.