适用于PLC的配电变压器高频等效模型及参数提取法

摘要

中压配电网沿线跨接容量、型号不同的配电变压器且数量较多，对PLC信号传输特性产生较大影响。为实现对载波信道衰耗预测以及新一代中压配电网载波通信实用化技术的需求，考虑到配电变压器的趋肤效应、杂散电容、铁心饱和及磁滞现象，提出一种适用于中压配电网载波通信的配电变压器高频等效模型，并给出模型的二端口网络理论的参数提取方法。利用该法提取的高频参数得到配变高压侧阻抗特性曲线并与实测阻抗曲线对比，两者变化趋势基本一致验证了该高频等效模型的正确性，为载波通信信道建模及特性分析做了铺垫工作。%In the medium voltage distribution network, the number of the distribution transformers of different ca⁃pacity and type is large, which has a great influence on the transmission characteristics of PLC signal. In order to meet the demands of carrier channel attenuation prediction and a new generation of medium voltage distribution net⁃work carrier communication practical technology, taking the skin effect of the distribution transformer, stray capaci⁃tance, core saturation and hysteresis into account, the a method to extract suitable for medium voltage distribution network carrier communication of power distribution transformer high frequency equivalent model is put forward, and the model parameters of two port network theory are given. By this method, the characteristic curves of high frequency parameters are obtained and compared with the measured impedance curves. The change trends of the two methods are basically consistent and the correctness of the model is verified, which proves the way for further study of the carrier communication channel modeling and characteristic analysis.