Analysis on Impedance Related Signal Attenuation for Power Line Communication

Impedance modeling for low voltage distribution network has important applications in power line communication and smart home constructions. Attribute to the topologies and loads connection, impedances of low voltage power line and loads are various and complicate. To obtain impedance characteristics of resident community distribution network, impedances characteristics with time and frequency are worth to be mastered. This paper presents measurements and analysis of the impedance of several electric loads and communication nodes on low voltage residential distribution network at frequencies from 100kHz to 500kHz. Benefited from these impedances measurement results, a signal attenuation model, which is related with impedance variation, is deduced. The simulation had verified that this model can approximate the real measurement result satisfactorily.