Research On Smooth Switching Control Strategy Of Wind Solar Energy Storage Microgrid

With the increasing depletion of energy and the gradual emergence of environmental problems,distributed micro-grids provide a feasible path for solving energy shortages and achieving carbon neutrality at an early date.Therefore,starting from the basic characteristics of photovoltaic power generation,wind power generation and energy storage systems,this paper proposes a series of control technologies through analysis and modeling.The main work content includes:First,based on the mathematical model of photovoltaic cells,the characteristics are analyzed,the maximum power tracking technology and three control methods commonly used in photovoltaic systems are introduced,and the incremental conductance method and the disturbance observation method are simulated and analyzed.The simulation results verify the feasibility of the method;secondly,the basic theory of the wind power generation system is analyzed,the maximum power tracking technology of the wind power generation system and four control methods are introduced,and the mathematical construction of the energy storage lithium battery in the microgrid is carried out.The model parameters were fitted by the pulse discharge method.Next,the mathematical model of the grid-connected inverter and the traditional control strategy were analyzed.Aiming at the increasingly prominent weak grid characteristics of the current grid,a fractional-order-based The PID control strategy is compared with the traditional and improved control methods on the Matlab/Simulink platform.The simulation results verify the superiority of the improved control strategy.Finally,the smooth switching technology is summarized,and the smooth switching is combined.The control strategy of the grid inverter is analyzed,and the proposed control strategy is simulated.The simulation results verify the feasibility of the method.This paper mainly focuses on the research on the stability of the grid-connected inverter,the key interface device between the microgrid and the power grid,and the proposed fractional PID control strategy,whether in a strong power grid or in a weak power grid,performs well.Robustness,thereby improving the reliability of the microgrid system.In addition,for the smooth handover technology,this article also gives the corresponding handover strategy.The simulation experiment verifies that the system achieves the purpose of smooth handover.