风电机组接地系统雷电暂态的建模与仿真

提出了一种计算风电机组接地系统雷电暂态的有效模型.该模型将接地系统建模为一系列π型电路组成的电网络,然后利用梯形积分将此电网络转换为其暂态等值计算电路,最后通过电路分析法求解接地系统地暂态响应.该模型考虑了接地电极的分布参数效应和土壤的电离现象.讨论了雷电流电的幅值、接地电极的尺寸以及土壤电阻率对接地系统暂态响应的影响.为验证该模型的有效性,将数值计算结果与电磁暂态程序EMTP的仿真结果进行了比较.

Modelling and Simulation of Lightning Transients in Wind Turbine Grounding Systems

An effective model is proposed for simulating lightning transients in wind turbine grounding systems.The grounding system is modelled by an electrical network comprised of series of π type circuits and trapezoidal rule of integration is applied to convert the network to its equivalent impedance circuit.Transient responses of the grounding system are solved by circuit analysis.In the model,the distribution parameter and the soil ionization phenomenon of the grounding electrodes are taken into account.The influences of lightning current magnitude,grounding electrode size and soil resistivity on the transient responses are also discussed.The validity of the presented model is achieved by comparing the calculated results with those obtained in the transient program EMTP.