基于多导体传输线模型变压器宽频参数的计算修改稿.docVIP

基于多导体传输线模型变压器宽频参数的计算 张旭东1，张重远2，陈涛2，葛鑫2 （1 沧州供电公司，河北 沧州 061000 2 华北电力大学 河北省输变电设备安全防御重点实验室，河北 保定 071003） 摘要：为了研究VFTO（特快速暂态过电压）对变压器的影响，结合有限元计算方法，提出了基于多导体传输线模型(Multi-conductor Transmission line，MTL)的宽频导纳参数计算方法。该方法改变了以往方法计算思路，针对模型矩阵中非零电流变量数量很少的特点，将非零电流变量和零值分别提取应用到导纳参数计算中，并在采用模电流和模电压实现传输线模型解耦的基础上，推导出双绕组导纳参数求解的全过程，此方法同样简便适用于单绕组或多绕组，避免了以往计算方法的复杂数值方程计算，提高了计算效率；应用有限元方法计算电容参数，根据绕组的几何结构，将电容耦合连续的若干匝绕组视为一个传输线，有效降低了参数矩阵的阶数，提高了工程应用性。通过对一台10kV单相双绕组变压器的计算结果与测量结果进行比较，验证了本文方法的正确性。 关键词：变压器 宽频模型 导纳参数 有限元 多导体传输线 中图分类号：TM41 文献标识码：A 文章编号： Calculation method on wide frequency admittance parameters for transformer based on MTL ZHANG Xu-dong1, ZHANG Zhong-yuan2, CHEN Tao2, GE Xin2 (1 State Grid Cangzhou power supply company, Cangzhou 061000, China 2 Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense， North China Electric Power University，Baoding 071003，China)Abstract: In order to study the influence of VFTO(Very Fast Transient Overvoltage) on transformer, calculation method for wide-band admittance parameters was proposed based on multi-conductor transmission lines model, combined with finite element method. The method proposed in this paper extracts non-zero current variables and zero value respectively in order to apply them to the admittance parameters calculation, which changes the previous calculation method. At the same time, it deduces the whole calculation process of the double-winding admittance parameters on decoupling of transmission line model by mode current and voltage, which also applies to one or more windings easily. Furthermore, it avoids the complex numerical equation calculation of the previous calculation method, as well as improves the computational efficiency. At last, it treats several capacitive coupling continuous winding as a transmission line by applying finite element method, reducing order number of the parameter matrix and improving the engineering application. The correctness of this method has been verified by comparing calcu