中文摘要：

为优化风电机组控制系统电源防雷设计，对其两级保护电路进行了分析计算，从这一电路的暂态响应指标入手，提出了一种定量化的设计算法。该算法首先采用幂函数表达式来描述压敏电阻的伏安特性，求取保护器电路中除压敏电阻外的剩余多端口线性网络的等值简化参数，得出压敏电阻所满足的非线性方程，并选用修正牛顿迭代法加以求解，然后以这些电压响应为基础，计算出保护器电路其余线性支路的暂态响应。由该算法得出的保护指标计算值能够与实测值较好地吻合，从而使该算法的有效性得到了校验。

英文摘要：

To analyze and calculate a two-grade protective circuit used in the wind turbine control system, we put forward an efficient algorithm to simulate the transient behavior of the relevant protective device. The u-i characteristic of metal oxide varistors is represented by power function. Following a discretization treatment of the linear elements, the equivalent calculation network of the protective circuit is obtained for transient simulation. The simplified parameters of the residual multiport network are determined by removing the metal oxide varistors from the equivalent calculation network. According to these simplified parameters, the nonlinear equations are formed for the branches of the metal oxide varistors. A modified Newton iteration formulation is employed to solve the nonlinear equations. Moreover, the transient calculation for the linear part of the equivalent calculating network is performed in terms of the voltage responses of the metal oxide varistors. The calculated results are well in agreement with meas- ured ones, which confirms the validity of the algorithm.