Research On Feedback Linearization Control Of Doubly-fed Induction Wind Turbines Participating In System Active Power Regulation

Wind energy storage is rich,clean,easy to develop,and widely distributed.In recent years,research on wind power generation has been unprecedentedly prosperous.At present,common wind turbines have a doubly-fed induction generator(DFIG)and a permanent magnet synchronous generator(PMSG),in which DFIG has a higher energy conversion in variable speed operation.Efficiency,power electronic rectifiers are relatively low cost,and can achieve active and reactive decoupling control,which is more widely used in wind power generation.The rotor and system frequency of the doubly-fed induction generator set are decoupled,and the wind farm cannot provide inertia support to the system like a conventional synchronous generator.In order to improve the utilization of wind energy,almost all of the wind turbines of the access system operate under the state of maximum power point tracking(MPPT).In this way,in the high-permeability system of wind power generation,when the active power and reactive power of the system fluctuate,the wind turbine still runs under the maximum power tracking state,which will inevitably have a great impact on the stability of the system..Therefore,the research on the control method of wind turbine participation in system stability has a strong sense of urgency and practical significance.This paper focuses on the research of the doubly-fed induction generator participating in the system stability adjustment control method.This paper studies a classical application of nonlinear control-feedback linearization control(FLC)control method,and applies it to the doubly-fed induction generator to achieve its maximum power tracking and participation system stability adjustment.Firstly,the operation principle of doubly-fed induction generator is introduced.The mathematical model of the doubly-fed induction generator in stator flux linkage and stator voltage orientation is analyzed.The stator voltage oriented wind turbine is built in MATLAB2016 a.Mechanical system and rotor side converter model.Analyze its maximum power tracking principle and achieve maximum power tracking under traditional PI control.Secondly,the multi-input-multi-output system feedback linearization principle applied to wind turbines is analyzed,and the stability of the method is analyzed by Lyapunov analysis method.The model of the doubly-fed induction generator in the feedback linearization control mode is built in MATLAB2016 a,and the system stability is adjusted according to the scheduling parameters.Finally,under the three conditions of common random wind speed,step wind speed and low voltage ride through,the analysis of the doubly-fed induction generator adopts the feedback linearization control method and the traditional PI control mode to participate in the system stability regulation performance.The simulation results show that the feedback linearization method proposed in this paper can make the doubly-fed induction generator more effective in system stability regulation.