DFIG Control Modeling Based On Optimization Of Pack Gray Wolves And Participation In Power Grid Frequency Modulation Research

With the development of the times,the progress of science and technology,the energy crisis and the continuous aggravation of environmental pollution,the development and utilization of renewable energy has gradually become the main direction of the current countries.As one of the most common renewable energy sources,wind energy has the advantages of being rich,inexhaustible and convenient to use.It has become the most promising renewable energy source.With the penetration of large-scale wind power in power system,the strong randomicity and intermittency of power generation will inevitably affect the dynamic frequency response of the power grid.The dual-fed induction generator is generally superior to the permanent magnet synchronous generator in performance,which has become the most mainstream type of wind power generation.Based on doubly-fed induction motor designed a wind optimal PID control strategy based on swarm intelligence algorithm,aims to achieve its maximum power under random wind speed tracking and participate in the problem of power system frequency control.In this paper,the characteristics and operation performance of doubly-fed induction generator are analyzed,and the wind speed model,aerodynamic model and mechanical axis model are established respectively.Then,turn under the three-phase static coordinate system of the motor model to the dq synchronous rotating coordinate system,get the mathematical model of grid side and rotor side converter,and analyzes the different operating range state the mechanism of the maximum power point tracking and wind power.Then,by analyzing the static and dynamic characteristics of the power grid frequency,the main reasons for the fluctuation of the power grid frequency are obtained.According to frequency fluctuation,this paper expounds the basic way of system frequency regulation,to study the mechanism of frequency response,it is concluded that need in doubly-fed induction wind turbine rotor parts add a control link,to control the frequency,convert the kinetic energy stored in the rotor to active power,complete fan for grid frequency modulation,through the MATLAB/Simulink simulation of single-phase earth fault and branch respectively,three phase ground fault and power grid load mutation of lee units involved in frequency modulation is studied.Utilizing group of wolves optimization algorithm is proposed in this paper to achieve the optimal PID control doubly-fed induction motor,the mutation of the wind speed to fast track regulation,at the same time can realize fast regulation of frequency of mutations in the grid.The calculation example analysis adopts MATLAB/Simulink to model the fan rotor side control part.Whistle in xundian county of yunnan ocean wind a fan actual operation parameters to optimize the performance of the proposed method,and compared with genetic algorithm,particle swarm optimization algorithm,Moth-flame optimization,as well as the original gray wolf algorithm were compared.In this paper,the comparison of step wind speed,random wind speed and power grid voltage drop under two different conditions without considering the control cost and the control cost are analyzed.Through the simulation analysis,the utility and reliability of the proposed algorithm in the power grid frequency modulation are verified.