scholarly journals Electromagnetic model for the study of transitory phenomena associated with atmospheric discharges on transmission lines

Athenea ◽  
2021 ◽  
Vol 2 (5) ◽  
pp. 5-28
Author(s):  
Adrian Olivo ◽  
Juan Toledo
Keyword(s):  
Finite Difference ◽  
Transmission Lines ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Doctoral Dissertation ◽  
Power Delivery ◽  
Return Stroke ◽  
Supervisory System ◽  
Difference Time

The analysis of a research work developed in the company C.V.G CARBONORCA of Venezuela is presented, which has two gas purification plants for the cooking area, designed to purify the gas that comes from the cooking ovens. Each plant is made up of solenoid valves, pneumatic valves, transmitters, process mimic panel and a supervisory system. All these elements are governed by a SIEMENS S5-115U PLC which is in a state of obsolescence, which is why the replacement of these automata by ALLEN BRADLEY ContolLogix automata was designed, in order to guarantee continuity in operations in plant. The research was done with a descriptive design of the field experimental type. A code for each gas treatment plant was obtained in RSLOGIX 5000 v17.00.00 and the update of the database of the supervisory system. The operation of the program was also verified through a simulation of the plant in a supervisory system, the deployment of which was designed for this purpose. Keywords: Automation, Modernization, ControlLogix, Supervisory System, Mimic Panel References [1]M. Uman, D. Mclain and P. Krider. “The Electromagnetic Radiation from a finite antenna” AJP, vol. 43, 1975. 1975. [2]A. Agrawal, H. Price and S. Gurbaxani. “Transient response of multiconductor transmission lines excited by a no uniform electromagnetic field”. IEEE Transactions on electromagnetic compatibility, (2), 119-129. 1980. [3]C. Nucci, F. Rachidi, M. Ianoz and C. Mazzetti. “Comparison of two coupling models for lightning-induced overvoltage calculations”. IEEE Transactions on power delivery, 10(1), 330-339. 1995. [4]R. Thottappillil and M. Uman. “Comparison of lightning return‐stroke models”. Journal of Geophysical Research: Atmospheres, 98(D12), 22903-22914. 1993. [5]K. Yee. “Numerical solution of initial boundary value problems involving Maxwell’s equations in isotropic media”, IEEE Transactions on Antennas and Propagation, vol. AP-14, no. 3, pp. 302–307, May 1966. 1966. [6]A. Taflove and S. Hagness. “Computational Electrodynamics: The Finite-Difference Time-Domain Method”. Boston-London: 2005. [7]A. Elsherbeni and V. Demir. “The finite-difference time-domain method for electromagnetics with MATLAB simulations”. The Institution of Engineering and Technology. 2016. [8]V. Silva. “Aplicação do método FDTD para avaliação da resposta de linhas de transmissão e aterramentos elétricos frente a descargas atmosféricas”. Dissertação de Mestrado, Universidade federal de minas gerais. Belo Horizonte, Brasil. 2017. [9]T. Noda and S. Yokoyama. “Thin wire representation in finite difference time domain surge simulation”. IEEE Transactions on Power Delivery, 17(3), 840-847. 2002. [10]R. Chamié-Filho. Análise de tensões induzidas em linhas de distribuição de baixa tensão frente a uma descarga atmosférica. 2009. [11]R. Jiménez. “Lightning Induced Voltages on Overhead Lines above Non-Uniform and Non-Homogeneous Ground” Doctoral dissertation, Universidad Nacional de Colombia-Sede Medellín. 2014. [12]S. Visacro and A. Soares. “HEM: A model for simulation of lightning-related engineering problems”. IEEE Transactions on power delivery, 20(2), 1206-1208. 2005. [13]J. Herrera. “Nuevas aproximaciones en el cálculo de tensiones inducidas por descargas eléctricas atmosféricas”. Programa de Doctorado en Ingeniería Eléctrica, Facultad de Ingeniería, Departamento de Ingeniería Eléctrica y Electrónica, Universidad Nacional de Colombia, Bogotá, 128 . 2006. [14]C. McAfee. “Lightning return stroke electromagnetics-time domain evaluation and application” Doctoral dissertation. 2016. [15] S. Gedney. “Introduction to the finite-difference time-domain (FDTD) method for electromagnetics”. Synthesis Lectures on Computational Electromagnetics, 6(1), 1-250. 2011. [16]Y. Taniguchi, Y. Baba, N. Nagaoka and A. Ametani. “An improved thin wire representation for FDTD computations”. IEEE Transactions on Antennas and Propagation, 56(10), 3248-3252. 2008. [17]E. Soto. “Cálculo de campo electromagnético producido por rayo para terreno no plano y su efecto en las tensiones inducidas en líneas de distribución”. Tesis de Maestría, Universidad Nacional de Colombia. Manizales, Colombia. 2010. [18]D. Sullivan. “Electromagnetic simulation using the FDTD method”. John Wiley & Sons. 2013.

scholarly journals From Time-Collocated to Leapfrog Fundamental Schemes for ADI and CDI FDTD Methods

Axioms ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Eng Leong Tan
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Unconditionally Stable ◽  
Alternating Direction Implicit ◽  
One Dimensional ◽  
Alternating Direction ◽  
Fdtd Methods ◽  
Difference Time

The leapfrog schemes have been developed for unconditionally stable alternating-direction implicit (ADI) finite-difference time-domain (FDTD) method, and recently the complying-divergence implicit (CDI) FDTD method. In this paper, the formulations from time-collocated to leapfrog fundamental schemes are presented for ADI and CDI FDTD methods. For the ADI FDTD method, the time-collocated fundamental schemes are implemented using implicit E-E and E-H update procedures, which comprise simple and concise right-hand sides (RHS) in their update equations. From the fundamental implicit E-H scheme, the leapfrog ADI FDTD method is formulated in conventional form, whose RHS are simplified into the leapfrog fundamental scheme with reduced operations and improved efficiency. For the CDI FDTD method, the time-collocated fundamental scheme is presented based on locally one-dimensional (LOD) FDTD method with complying divergence. The formulations from time-collocated to leapfrog schemes are provided, which result in the leapfrog fundamental scheme for CDI FDTD method. Based on their fundamental forms, further insights are given into the relations of leapfrog fundamental schemes for ADI and CDI FDTD methods. The time-collocated fundamental schemes require considerably fewer operations than all conventional ADI, LOD and leapfrog ADI FDTD methods, while the leapfrog fundamental schemes for ADI and CDI FDTD methods constitute the most efficient implicit FDTD schemes to date.

scholarly journals Butterfly-Inspired 2D Periodic Tapered-Staggered Subwavelength Gratings Designed Based on Finite Difference Time Domain Method

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Houxiao Wang ◽  
Wei Zhou ◽  
Er Ping Li ◽  
Rakesh Ganpat Mote
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Fdtd Method ◽  
Subwavelength Structures ◽  
Surface Reflection ◽  
Subwavelength Gratings ◽  
Difference Time

The butterfly-inspired 2D periodic tapered-staggered subwavelength gratings were developed mainly using finite difference time domain (FDTD) method, assisted by using focused ion beam (FIB) nanoscale machining or fabrication. The periodic subwavelength structures along the ridges of the designed gratings may change the electric field intensity distribution and weaken the surface reflection. The performance of the designed SiO2gratings is similar to that of the corresponding Si gratings (the predicted reflectance can be less than around 5% for the bandwidth ranging from 0.15 μm to 1 μm). Further, the antireflection performance of the designedx-unspaced gratings is better than that of the correspondingx-spaced gratings. Based on the FDTD designs and simulated results, the butterfly-inspired grating structure was fabricated on the silicon wafer using FIB milling, reporting the possibility to fabricate these FDTD-designed subwavelength grating structures.

Application of ADE-FDTD Method in Lossy Lorentz Media

2014 ◽  
Vol 945-949 ◽  
pp. 2486-2489
Author(s):  
Qing Chao Nie ◽  
Bing Kang Chen
Keyword(s):  
Differential Equation ◽  
Wave Propagation ◽  
Finite Difference ◽  
Theoretical Result ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Time Domain Method ◽  
Domain Method ◽  
Difference Time

A finite-difference time-domain method based on the auxiliary differential equation (ADE) technique is used to obtain the formulation of 2-D TM wave propagation in lossy Lorentz media. In the paper, the reflected coefficients calculated by ADE-FDTD method and the exact theoretical result are better agreement.

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