Research On Frequency Smoothing Method Of Wind Power Generation Considering Random Fluctuation Of Source Load Power

Environmental pollution and energy crisis promote the rapid development of wind power generation.The increasing proportion of wind power generation in the power system brings challenges to the stability of the power system.The fluctuation of wind power and load power puts forward new requirements for the stable control of system frequency.The purpose of this paper is to focus on the method of doubly fed wind turbine participating in system frequency regulationFirstly,the research background and significance of doubly fed wind turbine participating in system frequency regulation are introduced,the modeling of doubly fed wind turbine is carried out,and the methods and principles of existing wind turbine participating in system primary frequency regulation are introduced,which lays a good foundation for further research on doubly fed wind turbine participating in system frequency regulation.Secondly,different wind farms face different wind speeds and different inertia of units.At present,the traditional virtual inertia control only uses a uni fied coefficient for them,which is not conducive to the later speed recovery of units with too high or too low wind speed.In this paper,different coefficients are used to optimize the virtual inertia control for different speed units,and the polarity o f control parameters is modified in the frequency recovery stage to optimize the frequency recovery process.In view of the current situation of using overspeed or pitch angle control to reserve reserve reserve power for the wind turbine at the expense of normal power generation,this paper uses super capacitor as the reserve of doubly fed fan participating in system frequency regulation,and the normal operation of wind turbine is under maximum power tracking to ensure its power generation efficiency.Finally,PI controller is used in the traditional rotor side closed-loop control of doubly fed wind turbine.The control structure is simple and widely used.However,in the face of frequent disturbances of wind power,its parameter robustness and disturbance rejection are poor.In this paper,linear active disturbance rejection controller is used to optimize the rotor side power loop,so that the power can track the power reference value quickly and smoothly,so as to improve the effect of wind turbine participating in system frequency regulation and improve the anti disturbance performance of the system.