光伏变电站用氧化锌避雷器多物理场耦合分析

针对传统有限元法在多物理场耦合计算过程中存在计算量大、精度过于依赖网格划分的缺陷，以某光伏变电站用220 kV氧化锌避雷器为例，提出一种将有限元法与无网格法结合的温升计算方法。首先，建立了避雷器三维流体场有限元模型，得到流体分布；其次，将对流换热系数作为温度场计算的边界条件，分别采用有限元和无网格法计算额定运行下避雷器温升和避雷器老化故障情况下的温升；最后，与基于传统有限元法耦合计算及实验结果进行对比，在验证了所提方法准确性的同时，还发现其求解速度远高于传统有限元法。

A Coupling Analysis of Multiphysical Field for ZnO Surge Arrester Installed in Photovoltaic Substation

Conventional finite element analysis(FEA) employed in multiphysical field coupling analysis usually suffers from such drawbacks as large computational effort and heavy reliance on grid quality. Taking a 220 kV ZnO surge arrester installed in a photovoltaic substation as an example, a new multiphysical field coupling analysis is proposed based on combined FEA and meshless method to solve thermal transfer problem. Firstly, a three-dimensional fluid field FEA model is established for surge arrester to obtain the detailed fluid distributions. Secondly, the calculated convective heat transfer coefficients are taken as the boundary conditions of thermal field analysis. The FEA and meshless method are used to calculate the thermal rise of surge arrester under rated operation and aging condition. Finally, the simulation result of the proposed method are compared with that obtained by conventional FEA and experiments, which verifies the effectiveness of the proposed method with a computational speed much higher than that of the conventional FEA.