Optimal Control Strategy Of Electrochemical Energy Storage Assisted Power Grid Peak Shaving Under High Wind Power Penetration

In recent years,wind power generation technology in China is becoming more mature,and installed capacity continues to soar.However,due to the distinct uncertainty and anti-peak regulation characteristics of wind power generation,on the one hand,the demand for system backup increases,on the other hand,the net load peak valley difference of the power grid increases.Also,the increasing speed of power grid load is decreasing,the contradiction between supply and demand of source load is increasing,and the problem of peak load regulation is becoming more and more prominent.To solve the problem of peak load regulation in power systems,the "wind power limit" measures must not be implemented,which results in a large amount of waste of wind power.To effectively eliminate the abandoned wind,the method of using the deep peak regulation of thermal power units to improve the space problem of wind power grid connection emerges.However,this measure seriously affects the service life of thermal power units,and low load operation will increase the operating cost of the units.Therefore,thermal power enterprises should adjust the power plants The willingness of the peak is insufficient.With the development of electrochemical energy storage technology and its unique high-quality characteristics,electrochemical energy storage assisted peak regulation has become a hot topic.Firstly,this paper analyzes the peak load regulation demand of the power grid under high wind power permeability.Firstly,the paper analyzes the influence of wind power grid connection on the power grid operation and the characteristics of wind power self peak regulation and then proposes an analysis method of peak regulation demand of Power Grid Considering the permeability of wind power.The research object is the calculated wind power emission force to reflect the current and future peak regulation demand of the power grid more accurately and truly,and then the research work is carried out as the problem demand.Secondly,given the high demand for peak load regulation in high wind permeability areas,the paper proposes a strategy of improving the power change control for the energy storage of the power grid to cut peak and fill the valley.The control strategy considers the capacity,power,SOC limitation,and charge-discharge efficiency of the storage battery.The two-round iteration method is adopted and the mathematical model of charge-discharge of the variable power storage power is established.The capacity and power of the storage battery are fully utilized,and the peak valley difference of the load of the power grid is improved significantly.The evaluation index of the improved power control strategy is constructed,and the peak cutting and valley filling effect of the strategy is evaluated from the technical and economic aspects.Thirdly,a new optimal control strategy of virtual peak regulation for thermal power units is proposed,which considers the penalty of the separation of abandoned wind and the punishment of the energy storage.Firstly,to eliminate the abandoned wind,a fuzzy control-based punishment strategy is introduced to determine the optimal grid-connected power of wind power.Secondly,to improve the overall economy of the system,the energy storage and the fire motor group are regarded as peak regulating units.The virtual peak regulation control strategy of the thermal power unit is designed to optimize the output and charging and discharging power of the thermal power unit.Finally,to study the control strategy of electrochemical energy storage assisted peak regulation in high wind power penetration,a visual simulation platform of source storage network for virtual peak regulation of thermal power storage is developed by using Matlab GUI module,which includes four modules,including data management module,source load analysis module,peak regulation demand analysis module and fire storage combined peak regulation module.By developing the visual simulation platform,the strategy of this paper is more simple and can show the peak regulation effect more intuitively.