Research On Simulation And Control Of Doubly Fed Wind Power Converter System

As one of the renewable energy with great commercial value and potential,wind power generation technology has been developed rapidly all over the world in recent years.VSCF wind power technology has widely drawn close attention because of its unique advantages.In view of optimizing dynamic properties of DFIG wind power generation system,this paper gives the deep research about improving the stability of the power system,SVPWM vector control strategy,hybrid fuzzy PI control,proportional resonance control and so on,based on the operating principle and mathematical model.The main contents and work of this paper are as follows:Firstly,through the detailed analysis of working principle,mathematical model and equivalent circuit of the doubly-fed machine,the hybrid fuzzy PI control strategy is proposed on the basis of space coordinate transform and SVPWM vector control.It can not only make the converter system work normally in different operating conditions with distraction performance,but also has better dynamic properties compared with the modified parameters fuzzy PI control and traditional fuzzy PI control.Secondly,aiming at the problem that the traditional PI control has no harmonic compensation capability,a proportional resonance control strategy is proposed,which not only can make the system run stably,but also has the characteristics of low passing filter,making no harmonic compensated and improve the power quality.Thirdly,according to the control objectives of grid side converter,rotor side converter and DC link,the converter control system is designed through in-depth study to the double-loop PI control.Lastly,based on the MATLAB/Simulink simulation platform,the simulation model of the doubly-fed wind power converter system is established.Through the simulation,the effectiveness and feasibility of hybrid fuzzy PI and proportional resonance control strategy proposed is verified.Meanwhile,VSCF control,constant voltage control,grid-connected control and power decoupling control are also simulated.At last,some physics experiment of the power characteristics of DFIG wind power generation system is done.All the simulation results show that the proposed control strategy is effective.