Introduction of Damping Resistances in Simulations of ...
Transcript of Introduction of Damping Resistances in Simulations of ...
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
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• 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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