Simulation Analysis of Space Charge Dynamic Distribution Characteristic of Rotating Wind Turbine Tip Corona Discharge

In this paper, a multi-physics coupling calculation model of rotating wind turbine flow field, electric field and ion flow field is established by using the finite element software COMSOL. Based on the model, the distribution characteristics of positive space charge in the dynamic process of wind turbine rotation are obtained. It is found that in the initial stage of corona discharge, the space charge generated by discharge is distributed in an arc shape on the trajectory across the blade tip. With the increase of discharge time, there are corona discharge charges in the area where the wind turbine blades rotate. The charges migrate and diffuse towards the thundercloud direction under the action of the thundercloud background electric field, and are elliptically distributed in the space. The flow field generated by the rotation of the wind turbine and the wind turbine blade hinders the migration and diffusion of the charge below the wind turbine to the thundercloud, so the charge density above the wind turbine is lower than that below the wind turbine. When the thundercloud background is stronger, the earlier the corona discharge starts, the more charge is generated.