An Efficient Modeling Method for Large-Scale Complex Finite-Element Electric Field Numerical Calculation

In the process of solving electric field of the large-scale complex finite-element models, the fine control of the mesh on the outer surface of metal entity models is often difficult. Therefore, considering the basic geometric structure of the equipment, an efficient finite-element modeling method based on multilayer external surround entities (MESE) is proposed. Taking a simple 2-D model as an example, the algorithm of MESE generation, the principle of region division and related operation flow are introduced. The correctness of the method is validated through the typical case of parallel cylindrical conductors model, and the number of MESE is discussed as well. The proposed method is applied to the surface electric field calculation of the +/- 1100 kV ultrahigh-voltage direct current converter station valve hall. The calculated maximum electric field strength is 14.2 kV/cm. Furthermore, compared with the submodel method, the accuracy and efficiency of the proposed method are verified.