适用于低压电力线通信的集总参数线缆模型

Lumped Parameter Cable Model for Low Voltage Power Line Communication

为在实验室环境下模拟实际低压电力线缆的信道特性,需要建立电力线通信频段下的线缆集总参数模型。提出了一种通过电磁仿真方法获得分布电阻和电感,以及采用开路阻抗测量方法获得分布电容的方法,在此基础上得到线缆的传输参数并将传输参数转换为Y参数,建立π形等效电路。基于矢量匹配法求解π形电路各支路的无源等效电路,从而建立线缆的集总参数模型。通过对比分布和集总参数模型下传输和阻抗特性的计算结果,证明了集总模型的准确性。所建模型可以通过电路级联模拟各种长度的实际线缆。

In order to simulate the channel characteristics of actual low voltage power cable in laboratory environment,the lumped parameter cable model should be established under the power line communication band.A method is proposed to obtain the resistance and inductance by electromagnetic simulation and capacitance combined with the method of measuring and calculating distributed capacitances in open circuit tests.And on this basis,the transmission parameters of the cable are obtained.The transmission parameters are converted to Yparameters,and theπ-type equivalent circuit is established.Based on the vector matching method,the passive equivalent circuits of each branch of theπ-type equivalent circuit are solved,and the lumped parameter cable model is established.By comparing the calculation results of transmission and impedance characteristics with the distributed and lumped parameter models,the accuracy of lumped model is proved.The model can simulate actual cables of various lengths by circuit cascades.