Abstract:In order to solve the problem of lightning transient process and protection of wind turbines, based on the circulation path of lightning current in the fan system, the transient simulation model of the integrated circuit of the single fan system and the transient model of the whole wind farm circuit are established by using EMTP-ATP software. The establishment process and model of each component model are analyzed. The calculation method of the parameter. The model can stereoscopically integrate the propagation path of lightning current in the fan system to reflect the transient characteristics of the lightning current propagating in various components of the fan system. Based on the transient circuit model of the integrated circuit of the fan system, the transient characteristics of the wind turbine blades, the nacelle, the tower and the transformer are studied. The influence of the cable shielding grounding method on the transient characteristics of the wind turbine is analyzed. The research shows that the overvoltage between the tower and the core reaches the maximum at the upper and lower ends of the wire core; the cable metal shield can effectively reduce the induced overvoltage between the tower and the core and the lightning current of the core, and the suppression ratio of the induced overvoltage It can reach 41%, the core lightning current suppression ratio can reach 60%; in addition, the grounding method of the shielding layer adopts the minimum amplitude of induced overvoltage when grounding at both ends.