【作者】 孙海峰；

【导师】 梁贵书；

【作者基本信息】 华北电力大学（河北） ， 电工理论与新技术， 2005， 硕士

【摘要】 为了研究气体绝缘变电站(GIS)中陡波前过电压(VFTO)对变压器的影响,本文以匝为单元建立了变压器绕组的多导体传输线(MTL)模型。采用有限元法计算了建模所需的变压器绕组参数。为解决大型电力变压器建模时方程数目庞大问题,提出了一种MTL 模型与等效阻抗相结合的综合模型。通过建立单输入多输出端口模型来求解所需的传递函数,从而确定谐振频率和谐振点,并进行了变压器绕组各项参数的灵敏度分析。在分析时域响应时,为了克服FFT 和IFFT 运算产生的混叠,本文采用了矢量匹配和递归卷积相结合的方法分析和计算了变压器绕组线匝的末端电压和匝间电压分布。仿真结果与试验结果吻合,说明了文中方法的可行性和正确性。更多还原

【Abstract】 Multi-conductor Transmission line (MTL) model based on the representation of the winding by its individual turns is used to analyze the transient response of transformer windings under Very Fast Transient Overvoltages (VFTO). A very efficient method, the simplified finite element method is used to compute the elementary parameters of transformer winding. For a real transformer winding, if each turn is simulated as one transmission line, a system of very large-scale equations will be obtained. This paper presents a model based on MTL using equivalent impedance to simplify the calculation. The single input and multiple output (SIMO) system is presented to calculate the transfer function. The resonant frequency and locations are obtained by this method. A new method to calculate the transient response of transformer via vector fitting and recursive convolution is also presented to solve the inevitable flaws of FFT. For validation, the calculated results are compared with the measurements on a transformer winding model and the result is satisfactory.更多还原