内部導体を有する風力発電タワーの雷サージ回路解析モデル

抄録

A model of a wind turbine tower with an internal conductor for lightning simulation by circuit analysis method is proposed in this paper. The tower is represented by a frequency-dependent pipe-type cable replacing the parameters of its earth return mode. The parameters of the other modes can be obtained by any conventional method, such as SEMLYEN SETUP with CABLE PARAMETERS installed in the Electro-Magnetic Transients Program (EMTP). The parameters of the earth return mode are obtained from a result calculated by Finite-Difference Time-Domain (FDTD) method taking into account the vertical configuration of the wind turbine tower. The simulated voltages of the tower and internal conductor by the proposed model agree with measured results of a small scale model. Numerical lightning surge simulation on a wind turbine tower, which cannot be perfectly represented by FDTD method, can be carried out by the proposed method.