变压器绕组的特快速暂态建模  

Modeling for Simulating Very Fast Transient in Transformer Windings

作　　者：张喜乐[1] 梁贵书[1] 董华英[1] 崔翔[1] 钟连宏 

机构地区：[1]华北电力大学电气工程学院 [2]广东佛山供电局,佛山528000

出　　处：《电工技术学报》2007年第3期55-59,78,共6页Transactions of China Electrotechnical Society

基　　金：河北省自然科学基金资助项目(503624)

摘　　要：为了研究陡波前过电压对变压器的影响,从短路导纳参数出发,提出了一种建立变压器绕组高频集中电路模型的方法。该方法首先由短路导纳参数计算绕组各匝的电压传递函数,并利用矢量匹配法对得到的电压传递函数进行有理函数逼近;其次,对得到的有理函数形式的传递函数利用多点Pade逼近进行阶数缩减,得到变压器绕组电压传递函数的降阶模型;最后,运用网络综合技术建立变压器绕组的高频电路模型。该电路模型仅由R、L、C和理想变压器构成,其模型参数可以根据电压传递函数的极点和留数非常方便地得出。通过对电路模型的仿真结果与实际测量结果进行比较,验证了本文方法的正确性。To study the very fast transient overvoltage （VFTO） distributions in transformer windings in gas insulated substations （GIS）, a systematic methodology is presented for establishing the high frequency lumped circuit model of transformer windings. Firstly, the voltage transfer functions are derived from the short-circuit admittance parameters which were calculated from the distributed parameters or measured parameters of transformer windings. Secondly, the voltage transfer functions are fitted with rational functions by vector fitting and then the rational transfer functions are order-reduced by multipoint Pade approximation. Lastly, the resultant voltage transfer functions are synthesized. The circuit model is only composed of passive elements R, L, C and ideal transformers, and the parameters of the elements can be easily determined by the poles and residues of the voltage transfer function through the formulas. The circuit model is simple and robust. The simulation results and measured results are presented, confirming the validity of the proposed methodology.

关 键 词：特快速暂态过电压 短路导纳参数 多导体传输线 电力变压器 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]