The Simulation And Experiments Research On Doubly Fed Wind Power Generation System

With the great development of world’s economy, the shortage of general energy is becoming more serious and the environment pollution caused by the burning of fossil fuel is leading more concerns. Developing green and renewable energy, persisting in sustainable development route has drawn many countries’ attention. As one kind of the renewable energy, wind power is close to general energy and has been the NO.1renewable energy, and wind power generation is now fastly developing.Firstly, this paper introduced the development status and future trend of wind power generation technology, the doubly fed induction generator (DFIG.) wind power generating system. The mathematical model has been built respectively in the3-phase static coordinate system and using the coordinate transformation theory, in the2-phase rotating coordinate system.Secondly, as to the dual PWM converter, space vector pulse width modulation (SVPWM) was introduced and analyzed. The grid-side PWM converter was controlled based on the strategy of grid voltage vector orientation, achieving the control of the DC bus voltage and unity power factor operation. Using the stator voltage vector orientation, the active power and reactive power of the DFIG was decoupled. Then simulation models of SVPWM, dual PWM converter were built based on the theoretical conclusion above using MATLAB/Simulink. The simulation results verified the correctness of the control strategy.Lastly, the DFIG-VSCF wind power generation experimental platform was introduced, and the theoretical derivation, simulation results were further verified based on the platform. And then some typical problems occurred when adjusting the system were analyzed.