柔性直流换流站宽频模型及雷电过电压计算

Wide-Band Model for VSC-HVDC Station and Calculation of Lightning Overvoltage

柔性直流输电作为一种新型的直流输电技术正日趋受到重视。作为实际工程中的重要环节,柔性直流输电换流站的过电压计算问题亟待解决。文中在点对点阻抗模型(nodeto-node impedance function,NIF)的基础上提出了新的模型参数测量方法,对一套柔性直流输电仿真系统建立了用于雷电过电压计算的宽频模型。实际的雷电冲击测试以及计算结果表明提出的模型能够准确地反映换流站承受雷电过电压时内部设备的过电压水平。

As a development trend of high-voltage direct-current （HVDC） power transmission technology, voltage source converter （VSC） technology is getting more and more attention. Overvoltage computation for converter station is one of the key issues to implement VSC-HVDC power transmission projects. In this paper, a broadband model of a VSC-HVDC simulation system is proposed based on node-to-node impedance function （NIF） for lightning overvoltage calculations with brand new parameter measurement method. The results indicate that the proposed model has accurately reflected the overvoltage level of the VSC-HVDC converter station in case of lightning surge.