A method for researching frequency selectivity of carrier communication channel based on impedance analysis

By constructing an impedance distribution model of power distribution areas based on impedance analysis and utilizing a two-port network transmission matrix model, the problems of frequency selectivity and time-varying characteristics in low-voltage power line carrier communication systems were solved, and the accurate calculation of channel frequency selection characteristics was achieved.

CN117749215BActive Publication Date: 2026-06-12QINGDAO TOPSCOMM COMM +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
QINGDAO TOPSCOMM COMM
Filing Date
2023-12-21
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing low-voltage power line carrier communication systems suffer from poor transmission environments in low-voltage distribution networks, exhibiting strong frequency selectivity and time-varying characteristics, making it difficult to establish accurate power channel models for analysis.

⚗Method used

An impedance analysis-based approach is used to abstract power distribution areas into impedance distribution models, constructing transformer equivalent impedance models, transmission line impedance differential models, and user load impedance models. The channel frequency selection characteristics between any two nodes are then calculated using a two-port network transmission matrix model.

🎯Benefits of technology

This paper provides a modeling method and components for a power distribution area impedance distribution model that can accurately calculate the channel frequency selection characteristics between any two nodes in the distribution area, thereby improving the analysis accuracy of carrier communication channels.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of carrier communication channel frequency selective research methods based on impedance analysis, and its technical scheme includes: step 1, power topology information survey and record such as transformer station line length, branch quantity, meter box user number range;Step 2, according to transformer station transformer specification, determine transformer equivalent impedance model;Step 3, according to the user number range information of transformer station meter box, the user load impedance model of each meter box position is randomly exported;Step 4, based on the impedance differential model of transmission line that actual transformer station transmission line parameter establishes;Step 5, the transformer equivalent impedance model of transformer station, user load impedance model, transmission line impedance differential model is substituted into two-port network transmission matrix model, and the channel frequency selection characteristic in 0.7MHz-12MHz frequency band between any two nodes of transformer station is calculated, for predicting the frequency selection characteristic between any two nodes of transformer station, can solve the problem that frequency selection characteristic between two nodes cannot be obtained by acquisition equipment due to noise or excessive attenuation.
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