Hybrid Energy Storage Capacity Configuration Method For Smoothing Wind Power Fluctuations

The global supply of fossil energy is in short supply,international energy prices remain high,and the utilization of clean energy has ushered in a critical turning point.Among them,the development of wind power generation is particularly rapid and has significant economic benefits,but it has a certain impact on the stability of the power system.For the intermittence and volatility of wind power generation,the use of energy storage system to assist wind farm grid connection can smooth the power curve of wind power grid connection,improve the grid connection characteristics of wind power,and enhance the flexibility of the grid.The battery energy storage and flywheel energy storage in the multi-energy storage method have unique charging and discharging characteristics.Through learning from each other and comprehensive configuration,they can effectively stabilize the fluctuation of wind farm grid-connected power,so that the wind farm can meet the output power grid-connected conditions and achieve the improvement of the system.for overall economic purposes.In this paper,considering the operating constraints of different energy storage systems,the economic indicators of the full life cycle of energy storage and the change requirements of wind power grid-connected active power,an optimal two-layer capacity configuration model of energy storage system is established to form a hybrid energy storage capacity configuration that can stabilize wind power fluctuations Strategy.In this paper,by analyzing the energy input,conversion,storage and output mechanisms of flywheel energy storage and battery energy storage,the principle model of the energy storage system is established;the model is used to simulate the transient response capability and power of each energy storage system after receiving the reference power command Following ability,so as to guide the energy distribution of hybrid energy storage;establish a direct-drive permanent magnet wind turbine model,combine wind storage combined grid-connected system;discuss the principles of various wind power stabilization algorithms,and analyze the grid-connected power of wind-storage combined system Flow;establish a flywheel energy storage system capacity allocation strategy under the constraints of grid stability requirements,energy storage system power and capacity constraints,energy storage system life,energy storage system life cycle investment costs and operating costs,etc.,using multiple The tracker optimization algorithm seeks to find the optimal energy storage capacity configuration;further establishes a double-layer capacity configuration model for hybrid energy storage composed of flywheel energy storage and battery energy storage to stabilize wind power output fluctuations,taking into account the battery charge and discharge The impact of the depth of discharge on the service life,the calculation of the number of replacements within the planned year,the optimal hybrid energy storage capacity allocation of the final calculation case,and the economic analysis of the allocation strategy,thereby verifying the effectiveness and feasibility of the energy storage capacity allocation method.