电力机车牵引变压器副边绕组过电压计算

Calculation of Transient Overvoltage in Secondary Winding of Electrical Locomotive Traction Transformer

为了研究计算电力机车牵引变压器在暂态过电压作用下副边绕组的电压响应问题,从电力机车牵引变压器原、副边绕组的电压传递函数出发,分别计算了牵引变压器的谐振频率点和副边绕组在暂态过电压作用下的响应。首先测量出机车牵引变压器原、副边绕组的电压传递函数,并用矢量匹配法和Arnoldi算法对此电压传递函数进行有理函数逼近和降阶处理,然后计算电压传递函数的谐振频率点。运用电网络理论得到传递函数的高频无源电路模型,此模型是一个由无源元件R,L,C和理想变压器组成的二端口网络。最后通过对此二端口网络施加不同类型的暂态过电压,仿真计算了变压器副边绕组的电压响应。

In order to research the voltage response in secondary winding of electrical locomotive traction transformer suffering from the transient overvoltage,transfer function is used to compute the resonant frequencies and voltage response in secondary winding of electrical locomotive traction transformer.Firstly,the transfer function between primary and secondary winding is measured,then this voltage transfer function is fitted with rational functions by vector fitting and order-reduced by Arnoldi algorithm.The resonant frequencies are achieved based on the transfer function.Then the order-reduced transfer function is synthesized to a circuit model which is only composed of passive elements R,L,C and ideal transformers.The voltage response of secondary winding is easily shaped by inputting the different excitations into this circuit model.