Research On Anti-Disturbance Compound Predictive Control For Small Wind Power Generation System

As a kind of clean and pollution-free resource,wind energy is abundant and renewable,and has become one of the main research directions of new energy generation.China's vast territory,is a large country,there is a very rich wind energy resources,small wind power generation system needs less capital cost,easy to install and use it as a supplement of power supply is used for daily life to alleviate the problem of energy shortages in some areas,reduce the environment pollution problem caused by coal-burning power plants.Therefore,it is of great practical significance to study the operation of a reliable small wind power system and extend it to the family use in rural areas.As a complex system with nonlinear,strong coupling and multivariate,wind power system is difficult to obtain the accurate model of the system due to its randomness,time-varying and uncontrollable characteristics.In addition,because the system running environment is often relatively bad,environmental factors on various aspects of the disturbance is also one aspect of wind power generation system is difficult to control,in order to solve the disturbance problems of wind power generation system,improve the efficiency of wind power generation system,this paper aiming at maximum power tracking control,research based on model predictive control(MPC)and the disturbance observation technology(DOB)of compound anti-interference control method,in order to improve the anti-interference ability of the system,and the main research contents are as follows:1.As the permanent magnet synchronous wind power generation system preliminary verification,the control strategy of the research and design the compound type Buck DC-DC converter anti-interference control algorithm,MATLAB/Simulink simulation results show that the method can effectively restrain disturbance,improve the control effect.2.Analyzed the mathematical model of PMSG,studied the vector control strategy(VC)and the principle of voltage space vector modulation(SVPWM).In the MATLAB/Simulink environment,the speed control system of permanent magnet synchronous generator is simulated and verified.3.Combined with the basic principle and characteristics of model predictive control,the forecast model of permanent magnet synchronous generator is analyzed,a model predictive controller design for permanent magnet synchronous generator and under the environment of MATLAB/Simulink simulation.4.In view of the interference sources of wind power generation system,the parameter perturbation,the change of wind speed as a lumped disturbance,by disturbance observer(DO)to estimate the total interference in a system,and through the feedforward compensation in the form of eliminating interference.The simulation results verify the effectiveness of the interference observation technique.5.Based on the simulation verification,the experimental platform of permanent magnet synchronous wind power generation was designed,and the above algorithm was verified by experiments.The experimental results show the effectiveness of the algorithm and give the direction of the next step.