低压电力线载波通信传输线参数测试与分析

Experiment and analysis of transmission line parameter for carrier wave communication over low-voltage power line

为给低压配电网电力线载波通信信道估算提供参考依据,有必要对电力线通信传输线的阻抗特性参数进行理论分析和实际测试研究。在简述配电网电力线载波通信传输线理论和传输线方程的基础上,总结了理想均匀传输线理论下和考虑集肤效应的电力线参数模型。使用HP4194阻抗相位增益分析仪对3+1芯交联聚乙烯绝缘聚氯乙烯护套钢带铠装电力电缆线进行实际测试,并根据测试结果使用Matlab计算出单位长度导线的电阻、电感以及两导线间的电容和电导,验证了电力线物理参数模型公式的准确性和其实际可使用性。同时,这些实测参数也为电力线通信信道特性分析和估算提供了一定的参考依据。

The impedance parameters of transmission line should be measured and analyzed for the channel estimation of power line communication, The power line parameter models of ideal even transmission theory with consideration of skin effect are presented based on the transmission line theory of power line communication, The transmission characteristic parameters of the （3＋1） metal strip power line covered with polyethylene insulation PVC are measured with HP4194, Based on the measurements,its resistance and inductance of unit length,as well as the capacitance and conductance between two leads are calculated with Matlab. The veracity of the model and its applicability are verified. The measured parameters can also be referred for characteristics analysis and calculation of power line communication channel.