Authors:Johan Winges, Thomas Rylander, Carl Petersson, Christian Ekman, Lars-Åke Johansson, Tomas McKelvey Pages: 86 - 92 Abstract: We present a procedure for system identification and tuning of a wireless power transfer (WPT) system with four magnetically coupled resonators, where each resonator consists of a coil and a capacitor bank. The system-identification procedure involves three main steps: 1) individual measurement of the capacitor banks in the system; 2) measurement of the frequency-dependent two-port impedance matrix of the magnetically coupled resonators; and 3) determining the inductance of all coils and their corresponding coupling coefficients using a Bayesian approach. The Bayesian approach involves solving an optimization problem where we minimize the mismatch between the measured and simulated impedance matrix together with a penalization term that incorporates information from a direct measurement procedure of the inductance and losses of the coils. This identification procedure yields an accurate system model which we use to tune the four capacitance values to recover high system-performance and account for, e.g., manufacturing tolerances and coil displacement. For a prototype WPT system, we achieve 3.3~kW power transfer with 91\% system efficiency over an air-gap distance of approximately 20~cm. PubDate: 2018-01-24 DOI: 10.22149/teee.v2i2.116 Issue No:Vol. 2, No. 2 (2018)
Authors:Uyara Ferreira Silva, Santiago Lemos, Manoel Ivany de Queiroz Júnior, Wesley Pacheco Calixto, Nikholas Segatti, Geovanne Pereira Furriel, Alan Henrique Ferreira Silva Pages: 1 - 10 Abstract: The purpose of this work is to calculate Surge and Swab pressure in oil wells with eccentricity between drill string and wellbore or casing string. Analysis of this phenomenon, in which the fluid is confined between two eccentric cylinders, are made. The conformal mapping is used to lead the eccentric domain into the concentric domain, since the usual models correspond to concentric geometries. The results of this study, using the proposed methodology, are presented and discussed. PubDate: 2017-06-27 DOI: 10.22149/teee.v2i2.92 Issue No:Vol. 2, No. 2 (2017)
Authors:Carlos L. B. Silva, Thyago G. Pires, Wesley P. Calixto, Diogo N. Oliveira, Luis A. P. Souza, Antonio M. Silva Filho Pages: 11 - 17 Abstract: This paper deals with the computation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The computer program implemented used in the mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for homogeneous soil and soil stratified in two layers. The results obtained with the proposed method will be compared with other methods in literature. Also will be presented the results of a grounding grid using wires at various angles. PubDate: 2017-06-27 DOI: 10.22149/teee.v2i2.95 Issue No:Vol. 2, No. 2 (2017)
Authors:Alireza Rezaee Pages: 18 - 23 Abstract: This paper proposes a Model Predictive Controller (MPC) for control of a P2AT mobile robot. MPC refers to a group of controllers that employ a distinctly identical model of process to predict its future behavior over an extended prediction horizon. The design of a MPC is formulated as an optimal control problem. Then this problem is considered as linear quadratic equation (LQR) and is solved by making use of Ricatti equation. To show the effectiveness of the proposed method this controller is implemented on a real robot. The comparison between a PID controller, adaptive controller, and the MPC illustrates advantage of the designed controller and its ability for exact control of the robot on a specified guide path. PubDate: 2017-06-27 DOI: 10.22149/teee.v2i2.96 Issue No:Vol. 2, No. 2 (2017)
Authors:Douglas Freire de Carvalho, Cleber Asmar Ganzaroli, Luiz Alberto do Couto, Rafael Nunes Hidalgo Monteiro Dias, Wesley Pacheco Calixto Pages: 24 - 30 Abstract: This paper presents study about Dynamic Matrix Control (DMC) controller applied to speed control of DC motor. DMC controller parameters (prediction horizon, control horizon and damping rate of reference) are obtained through optimization methods employing heuristic, deterministic and hybrid strategies. The use of advanced control technique combined with using of optimization methods aims to achieve highly efficient control, reducing the transient state period and variations in steady state. These methods were applied on a simulation model in order to verify which one provides better control results. Index Terms—Predictive Control, Deterministic Optimization, Heuristic Optimization, Hybrid Optimization, DC motor. PubDate: 2017-06-28 DOI: 10.22149/teee.v2i2.98 Issue No:Vol. 2, No. 2 (2017)
Authors:Thiago Martins Pereira, Rodrigo Alves Lima, Viviane Margarida Gomes, Wesley Pacheco Calixto, Aylton José Alves Pages: 31 - 36 Abstract: This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest. PubDate: 2017-07-05 DOI: 10.22149/teee.v2i2.99 Issue No:Vol. 2, No. 2 (2017)
Authors:Antonio Marcelino Silva Filho, Carlos Leandro Borges Silva, Marco Antonio Assfalk Oliveira, Thyago Gumeratto Pires, Aylton José Alves, Wesley Pacheco Calixto, Marcelo Gonçalves Narciso Pages: 37 - 44 Abstract: This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics. Results obtained show correlations among apparent electrical resistivity of the soil, moisture, soil compaction and clay content. PubDate: 2017-07-05 DOI: 10.22149/teee.v2i2.85 Issue No:Vol. 2, No. 2 (2017)
Authors:Calebe A. Matias, Girodani Pacífico Medeiros, Pedro H. F. Moraes, Bruno de A. Fernandes, Aylton J. Alves, Wesley P. Calixto, Geovanne P. Furriel Pages: 45 - 50 Abstract: The purpose of the present study is to simulate and analyze an isolated full-bridge DC/DC boost converter, for photovoltaic panels, running a modified perturb and observe maximum power point tracking method. The zero voltage switching technique was used in order to minimize the losses of the converter for a wide range of solar operation. The efficiency of the power transfer is higher than 90% for large solar operating points. The panel enhancement due to the maximum power point tracking algorithm is 5.06%. PubDate: 2017-07-05 DOI: 10.22149/teee.v2i2.93 Issue No:Vol. 2, No. 2 (2017)
Authors:Flávio Adalberto Gomes, Alfredo de O. Assis, Marcio R. da C. Reis, Viviane M. Gomes, Sostenes G. M. Oliveira, Wanderson R. H. de Araujo, Wesley P. Calixto Pages: 51 - 57 Abstract: The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced. PubDate: 2017-07-06 DOI: 10.22149/teee.v2i2.105 Issue No:Vol. 2, No. 2 (2017)
Authors:Muhammad Babar, J. Grela, A. Ozadowicz, P.H. Nguyen, Z. Hanzelka, I.G. Kamphuis Pages: 58 - 63 Abstract: Transactive based control mechanism (TCM) needs the IoT environment to fully explore flexibility potential from the end-users to offer to involved actors of the smart energy system. On the other hand, many IoT based energy management systems are already available to a market. This paper presents an ap-proach to connect the current demand-driven (top-down) energy management system (EMS) with a market-driven (bottom-up) demand response program. To this end, this paper considers multi-agent system (MAS) to realize the approach and introduces the concept and standardize design of Agilometer. It is described as an elemental agent of the approach. Proposed by authors Agilometer consists of three different functional blocks, which are formulated as an IoT platform according to the LonWorks standard. Moreover, the paper also performs an evaluation study in order to validate the proposed concept and design. PubDate: 2017-07-21 DOI: 10.22149/teee.v2i2.112 Issue No:Vol. 2, No. 2 (2017)
Authors:Weixian Li, Thillainathan Logenthiran, Van-Tung Phan, Wai Lok Woo Pages: 64 - 71 Abstract: Smart Buildings is a modern building that allows residents to have sustainable comfort with high efficiency of electricity usage. These objectives could be achieved by applying appropriate, capable optimization algorithms and techniques. This paper presents a Housing Development Building Management System (HDBMS) strategy inspired by Building Energy Management System (BEMS) concept that will integrate with smart buildings using Supply Side Management (SSM) and Demand Side Management (DSM) System. HDBMS is a Multi-Agent System (MAS) based decentralized decision making system proposed by various authors. MAS based HDBMS was created using JAVA on a IEEE FIPA compliant multi-agent platform named JADE. It allows agents to communicate, interact and negotiate with energy supply and demand of the smart buildings to provide the optimal energy usage and minimal electricity costs. This results in reducing the load of the power distribution system in smart buildings which simulation studies has shown the potential of proposed HDBMS strategy to provide the optimal solution for smart building energy management. PubDate: 2017-08-20 DOI: 10.22149/teee.v2i2.113 Issue No:Vol. 2, No. 2 (2017)
Authors:Maneesh Kumar, Raminder Kaur Pages: 72 - 79 Abstract: Planning for expanding a power system under different scenarios is one of the major challenge for power engineers hence, it is very important and essential to implement a well-balanced and feasible system over a time horizon under suitable assumptions and available constraints. Transmission expansion planning is one of this task. Here it is important to develop a suitable planning structure. In this paper some analytical approaches have been implemented for specific load condition with variations in generation. PubDate: 2017-09-08 DOI: 10.22149/teee.v2i2.111 Issue No:Vol. 2, No. 2 (2017)
Authors:Turgay Yalcin, Muammer Ozdemir, Pawel Kostyla, Zbigniew Leonowicz Pages: 80 - 85 Abstract: Nowadays supra-harmonic distortion studies are gaining attention day by day in power quality research area. When handling communication systems especially Power Line Carrier (PLC) systems in frequency range 2- 150 kHz, they are suitable for causing electromagnetic interference (EMI) to other systems. This study shows results of analysis employing advanced method called ensemble empirical mode decomposition (EEMD) to describe supra-harmonic distortion. Unlike the traditional method (short time fourier transform- STFT), EEMD gives extensive representation for supra-harmonic components PubDate: 2017-10-26 DOI: 10.22149/teee.v2i2.114 Issue No:Vol. 2, No. 2 (2017)
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