Channel Model for Low Voltage Three-Core Power Line Communication

The influences of proximity effect and complex dielectric permittivity on per-unit-length parameter matrices of three-core power line are analyzed. Based on the symmetrical structure of three-core cable, the per-unit-length parameter matrices are decomposed into common mode and differential mode parameters by phase-mode transformation. Taking the electromagnetic simulation results of finite element method as the initial values, a method of correcting per-unit-length parameters based on open-circuit impedance measurement in mode domain is proposed. Based on the theory of multi-conductor transmission line, the channel model of three-core power line in the frequency range from 30 kHz up to 15 MHz is established. The test results under the branch network show that the channel model has high accuracy, and the influence of the network structure on the impedance and transmission characteristics is further analyzed. The model can accurately take into account the coupling effect between multiple-input multiple-output channels.