应用模拟电流算法计算风电机组接地电阻

Calculation of Wind Turbines Grounding Resistances by Simulation Current Algorithm

接地电阻是表征风电机组接地装置性能的一个重要指标。笔者建议了一种计算风电机组接地电阻的有效计算方法,即模拟电流算法。该算法将机组接地装置中各接地体分段离散化,分别在各接地体和不均匀土壤分界面两侧设置模拟电流,从恒定电场的边界条件入手,建立模拟电流所满足的方程组,求取模拟电流,再由模拟电流来确定接地电阻。将按该算法得到的接地电阻值分别与实测值和专业软件CDEGS计算值进行了对比,以校验该算法的可行性。

The grounding resistance is an important index for characterizing grounding arrangements of wind turbines. An efficient algorithm, i.e. Current simulation algorithm, is proposed for calculating the resistances of wind turbines. In the algorithm, a segmentation process is implemented for the grounding electrodes. The simulation currents are installed on the axes of the grounding electrodes and on both side of the soil boundary. From the boundary conditions of steady electric field, the equations of the simulation currents are set up. The simulation currents are determined by solving these equations. Then, the grounding resistance can be calculated on the basis of the simulation currents. The calculated values are compared with the measured one and those from professional software CDEGS to check the validity of the proposed algorithm.