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Research On Disturbance Rejection Control Method For Wind Power Generation System

Posted on:2020-12-01Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y FangFull Text:PDF
GTID:2392330602460378Subject:Electronic Science and Technology
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Wind power generation,as the fastest growing form of new energy generation in the past decade,has attracted more and more attention from all over the world.Considering the problems of wind power system such as internal parameter perturbation,external disturbance and difficulty in accurate modeling,and the characteristics of wind energy signal such as randomness,time-varying and mutation,a disturbance rejection control method combining extended state observer(ESO)and integral sliding mode control is studied.The main research work of the thesis is as follows:(1)Nonlinear extended state observer(NLESO)and sliding mode reaching law are designed by elastic energy function.The convergence of NLESO is analyzed.And the stability of sliding mode controller is analyzed based on Lyapunov principle and complex frequency domain theory respectively.NLESO is constructed by elastic energy function,which guarantees the observational performance and avoids the differential peak value phenomenon.The sliding mode function is designed by integral sliding mode,which avoids the steady-state error caused by external disturbance.The sliding mode reaching law is designed by elastic energy function,which eliminates the high frequency chattering phenomenon in traditional sliding mode control.(2)The disturbance rejection control method combining ESO with integral sliding mode control is studied.Combining ESO with sliding mode control,all uncertainties in the control system are estimated and compensated actively by using ESO's good observational performance.It not only solves the problem of high frequency chattering of sliding mode control,but also ensures the strong immunity of the system.The adaptive parameter tuning of disturbance rejection controller avoids the problem of experiential tuning of controller parameters and enhances the robustness of the system.(3)For direct-driven permanent magnet synchronous wind power generation system,whether permanent magnet synchronous generator or grid-side converter,there have uncertainties such as internal parameter perturbation and external disturbance.The thesis proposes a disturbance rejection control method which combines ESO with integral sliding mode control.ESO is used to estimate all uncertainties in the system,which only needs to know the input and output information and does not depend on the mathematical model of the system.A sliding mode reaching law is designed by introducing a non-linear smoothing function,which eliminates the high frequency chattering problem in traditional sliding mode control.Combined with ESO,and the total disturbances and uncertainty are real-time estimated and feed-forward compensated by ESO,which guarantees the good disturbance rejection robustness of the system.The simulation results verify the effectiveness of the control method in the disturbance rejection control of wind power generation system.The disturbance rejection control method introduces elastic energy function to design ESO and sliding mode reaching law,and combines ESO,the core component of ADRC,with integral sliding mode control.It not only has fast response speed,high control precision,but also has good disturbance rejection robustness.It has great application value in the field of disturbance rejection control of wind power generation system.
Keywords/Search Tags:Wind Power Generation, Elastic Energy Function, Sliding Mode Reaching Law, ESO, Integral Sliding Mode Control, Disturbance Rejection Robustness
PDF Full Text Request
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