Physical model of transmission lines

with additional branches to introduce

the influence of the frequency

Code: 19.010

Aghatta Cioquetta Moreira

Thainá Guimarães Pereira

Luis Henrique Jús

Melissa de Oliveira Santos

André Alves Ferreira

Afonso José do Prado

UNESP, São João da Boa Vista, Brazil

17/11/2017 1

Working with other students, a physical model of transmission line is being developed (general objective) and it will be adapted to represent PLC (Power Line Communication) systems (specific objective).

Objective

17/11/2017 2

Transmission line theory: power

transmission (low frequency, high

power) or signal transmission (high

frequency, low power);

They are waveguides;

Simple model: application of π circuits;

Introduction

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Classical π circuits: no influence of

frequency on the line parameters;

Modified π circuits: frequency influence;

A physical model is based on a

numerical model;

It is a cascade of π circuits;

Introduction

17/11/2017 4

It is a mono-phase circuit;

Concepts: wave propagation, numerical

simulations, electromagnetic transient

phenomena, signal transmission, power

transmission;

Physical model for testing two different

wave propagations

Introduction

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It is used a linear system:

The structures of B and x are:

Mathematical bases

17/11/2017 6

BuAxx

TL

B 001

Tnn vivivix 2211

The structure of the A matrix is:

Mathematical bases

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CGC

LLRL

CCGC

CCGC

LLR

A

200

11

011

0

11

001

The longitudinal part of π circuits are

changed.

Physical model

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R L

R0L0

R1

L1

R2

L2

Rn

Ln

Physical model

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R0L0

R1

L1

R2

L2

Rn

Ln

8,2 µF 8,2 µF

1,2 Ω

Physical model

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Physical model

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PCB

Printed circuit board

SMD

Surface mount device

FPGA ?????

Application of two signals with

different frequencies.

Experimental results

17/11/2017 12

Experimental results

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Experimental results

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Experimental results

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Experimental results

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Transfer function

Experimental results

17/11/2017 17

Transfer function

Physical model of transmission lines;

Application of modified π circuits;

Simulations of propagation of signals

with different frequencies;

PLC (power line communication)???

Conclusions

17/11/2017 18

Acknowledgments

17/11/2017 19

Processes:

2015/21390-7

2017/03948-6