Frequency Characteristic Parameter Identification Algorithm for Wind Power Grid Connected System Based on EKS
Under the background of new power system construction,the system has put forward requirements for the frequency regulation ability of wind power integration.But when the adjustable capacity of wind power is depleted,it will exit frequency regulation,causing changes in parameters such as equivalent inertia and frequency re-sponse characteristics of the system,which affects the correct action of frequency control measures such as turbine and load cutting.Therefore,this paper proposes an identification method of frequency characteristic parameters of wind power grid-connected system based on Extented Kalman Smoother,EKS),which can realize efficient and accurate i-dentification of frequency characteristic parameters of the system under different working conditions.Firstly,the fre-quency control method of wind farm is analyzed,and the frequency response model of wind power grid-connected sys-tem based on common-mode component is established.Then,EKS algorithm is analyzed,and then the identification method of system frequency characteristic parameters based on EKS is proposed.Finally,it is verified by a simulation example.The simulation results show that the proposed method can effectively identify the inertia,damping and other frequency characteristic parameters of the system under different working conditions.
Grid-connected wind power systemFrequency responseExtended Kalman smootherParameter iden-tification
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