Research On Operation Control And Capacity Configuration Strategy Of Wind-Energy Storage Frequency Regulation System

With the large-scale renewable energy,especially wind turbine(WT)into the power grid,the intermittent and fluctuating power generation increase the burden of power frequency regulation and seriously influence the safety and stability of the power grid.Although WT has a certain frequency regulation capability,considering the influence of natural conditions,its frequency regulation output is not stable.Energy storage system(ESS)has the advantages of fast operation speed and large instantaneous throughput.It can cooperate with WT generation to form a wind-storage frequency regulation system to solve the above problems.This paper conducts research on the cooperative operation strategy and economic operation of the wind-storage system,and constructs a flexible operation mechanism and collaborative control framework for the wind-storage system to participate in frequency regulation control.The main contents include:(1)The influences of WT on the frequency regulation capability of power system are analyzed.Theoretical derivation verifies that the substitution of WT will reduce the frequency regulation capability of power system.Furthermore,the deteriorations of the dynamic and static frequency response characteristics after WT access are more intuitively displayed.This proves the necessity of WT actively participating in frequency regulation,and provides a theoretical basis and background for subsequent research.(2)Considering wind-storage system participates in the primary frequency regulation,a wind-storage control strategy on the basis of fuzzy-logic is proposed for the problem of the lack of cooperation and effectively use of frequency regulation resources between WT and ESS.Frequency regulation participation coefficient are determined through dynamic decision-making.Secondly,the real-time running wind speed of WT and frequency offset are used as input variables,so that WT can dynamically adjust real-time output.Finally,through simulation,it was verified that the cooperative operation control strategy can effectively improve the active frequency regulation capability of the wind-storage system.This control strategy fully utilizes the limited capacity of the ESS and the frequency response potential of the WT.(3)Considering ESS capacity planning of wind-storage system participates in frequency regulation in long term,an ESS capacity optimal calculation model of wind-storage system based on wind-storage control strategy on the basis of fuzzy-logic in chapter 3 is proposed for the problem of ESS capacity configuration.First,a fuzzy-logic controller based on SOC level and load-shedding level of WT is established to achieve requirement inner dynamic allocation of wind-storage system.Second,a SOC level management strategy is proposed.Last,ESS capacity optimal calculation model is established,it realizes the minimum cost of wind-storage system and ascertain the optimal storage capacity.The result shows that the wind-storage system can take part in frequency regulation economically.