直流输电线路下方建筑物附近离子流场的计算

直流输电线路下方建筑物附近电场分布复杂,基于Deutsch假设计算建筑物附近的离子流场在理论上会造成较大的误差,同时无法考虑风速的影响。基于上流有限元方法计算直流模拟试验线路下方房屋模型附近的离子流场,采用新型的迭代收敛控制技术,保证了迭代收敛过程的稳定性。计算结果与试验数据进行对比,得到了很好的验证。结果表明上流有限元方法适用于直流线路下方建筑物附近离子流场的计算。考虑风速的影响,计算建筑物附近离子流场,发现风速对建筑物附近合成场强以及离子流密度的影响很大,因此在计算直流输电线路下方建筑物附近电磁环境时,必须考虑风速对离子流场的影响。

Calculation of the Ionized Field Under DC Transmission Lines With Buildings Nearby

The electric field around the building under DC transmission lines is so complex that the calculation method based on the Deutsch assumption which cannot consider the effect of the wind when solving the ionized field near the building would result in large errors theoretically.Based on the upstream finite element method(FEM),a new iterative controlling method was used to calculate the ionized field around the building model under a DC test line.The iteration was efficiently convergent,and the calculation result agreed well with the measured data,which indicates that the method based on the upstream FEM method is valid for solving the ionized field under DC transmission lines with buildings nearby.Taking the wind velocity into account,the ionized field of the test line was calculated,and it was found that the effect of the wind on the electric field around the building is remarkable,thus the effect should be considered when calculating the electromagnetic environment under DC transmission lines with buildings nearby.