Introduction of Damping Resistances in
Simulations of Electromagnetic
Transients Using Alternate Structures
Code: 19.009
Melissa de Oliveira Santos, Luis Henrique Jús, Thainá
Guimarães Pereira, Aghatta Cioquetta Moreira, Afonso José
do Prado
UNESP, São João da Boa Vista, Brazil
13/11/2017 1
• Apply a different structure of π circuit in
cascade;
• Generate three-dimensional graphics that
show the behavior of the highest voltage
peak in the wave reflection;
• Compare with the model wich includes
damping resistance in all units of π circuits
in cascade;
• Check the results accuracy.
Objectives
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• Simulates long-range circuits (power) or circuits
that work in high frequency;
• Model transmission lines: π circuits in cascade;
• Digital simulations cause numerical errors;
• Numerical erros cause Gibbs oscillations;
• 𝑅𝐷 softens the oscillations;
• Initially, 𝑅𝐷 was introduced in all units of π circuits;
• Studies try to reduce computational time without
losing the accuracy.
Introduction
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• Classic structure of π circuit:
Methodology
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G
2
C
2
R L
G
2
C
2 v x t, v x x t ,
i x t, i x x t ,
• Matrix A structure:
Methodology
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CGG
CCG
LLR
L
CCG
C
LLR
L
CG
CCGG
CCG
LLR
L
CG
CCGG
C
LLR
A
DD
DDD
DD
22200
11
0
0110
11
121
11
0
121
001
Π circuit with RD
• Matrix A structure:
Methodology
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CGG
CCG
LLR
L
CCG
C
LLR
L
CG
CCGG
CCG
LLR
L
CG
CCGG
C
LLR
A
DD
DDD
DD
22200
11
0
0110
11
121
11
0
121
001
Π circuit without RD
Includes 𝑅𝐷 in alternating structure, with 𝑘𝐷 = 15 .
Experimental results
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301 π
circuits
101 π circuits
201 π circuits
• It is not possible to keep the accurate;
• 5% error in original model;
• 25% error in alternating structure
model;
• 20% error difference between the
models;
• 𝑅𝐷 aplication in all π circuits of cascade
still is a simple model better.
Conclusions
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