Doubly Fed Induction Wind Power System Design And Simulation

In the global atmospheric pollution and energy crisis in front of the grim situation, as the cheapest, the most promising without pollution energy, wind power generation has been universal importance. In the large-scale grid-connected wind power generation technology, the double-fed induction generating (DFIG) system based on AC-excited VSCF power generation technology is the most widely used the main models.At first, this paper introduces the DFIG system's basic structure; on the basis of analyzing the DFIG working principle and equivalent circuit establish the DFIG mathematical model in rotating coordinate system, according to request of the DFIG rotor excitation converter proposed dual PWM converter method that can be achieved two-way flow of energy.Secondly, on the basis of analyzing the grid side rectifier topology establish the mathematical model of grid side rectifier, and according to the grid side rectifier maintaining the stability of DC bus voltage and unit power factor design the dual closed loop control system based of the grid voltage vector oriented, and gives the PI parameter calculation method.Thirdly, according to the rotor side inverter realizing the maximum wind power tracking and the stator output active and reactive power decoupling of the control target design DFIG torque, power control system that based on the stator flux oriented.Finally, in the MATLAB / SIMULINK software create he simulation model of three and four chapters designed rotor excitation converter control system. Under different operating conditions, the maximum wind tracking performance and LVRT was simulation and research. Simulation results show the designed control system has a good track performance and certain LVRT capability.