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TechRxiv 2021年

作者： Trindade, Alessandro Galvão, Edilson Cordeiro, Lucas The Post-graduate Program in Electrical Engineering Manaus Brazil Department of Electricity Federal University of Amazonas Manaus Brazil School of Computer Science The University of Manchester United Kingdom

Annual global energy consumption growth is around 1.3% with forecasts until 2040. Photovoltaic systems became a suitable alternative to nuclear and fossil energy generation. In order to support this technology’s dissemination, we develop and evaluate an automated formal synthesis approach that assists in decision-making for off-grid systems. Our proposed approach, called PVz, is based on a variant of the counterexample-guided inductive synthesis;it has a multi-core feature, which can obtain the optimal sizing of photovoltaic systems focusing on Life Cycle Cost analysis. Given the electrical needs of a home, we seek a set of electrical equipment with the best possible combination of devices that meet the specified requirements. We calculate all costs related to maintenance over 20 years. The results presented are based on seven case studies;some of them are real ones from the Amazon region in Brazil. The same case studies were solved by a commercial optimization tool. Our technique and the commercial tool results were validated with popular simulation software to perform a fair comparison. Furthermore, we analyze some topics such as run-time, optimal solution, and configuration of the resulting systems. We claim that our technique is advantageous compared to the existing approaches in the literature. © 2021, CC BY-NC-SA.

关键词： Decision making

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Hybrid system for static load models parameters identification and electric power system simulation

Hybrid system for static load models parameters identificati...

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2019 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT Latin America 2019

作者： De Vargas, Vitor Werner Da Silva Pereira, Paulo Ricardo Unisinos Electrical Engineering Graduate Program São Leopoldo Brazil Unisinos Electrical Engineering Post-Graduate Program São Leopoldo Brazil

ISBN: (纸本)9781538695678

Static load models hold immense applicability in Electric Power Systems (EPS) steady-state analysis. This paper describes the most used static load models - polynomial and exponential - and proposes a hybrid system for parameters identification of the described models and EPS simulation, through an interface between the Python programming language and the OpenDSS EPS simulation software. Providing a theoretical foundation, this work presents the methodology implemented in the system, which employs computational optimisation with the method of least squares and the Levenberg-Marquardt algorithm, statistical analysis and EPS simulation. Its results, validated with measured data from various load compositions, acquired in a laboratory, indicate that the system has notable accuracy, precision and a wide application prospect in smart grids. © 2019 IEEE.

关键词： Python

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Unidirectional Five-Level Rectifiers for WECS Applications

Unidirectional Five-Level Rectifiers for WECS Applications

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Amanda P. Monteiro Cursino B. Jacobina Bahia Filipe A. C. Sousa Reuben P. R. Post-Graduate Program in Electrical Engineering - PPgEE/COPELE Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Federal University of Bahia (UFBA) Salvador Brazil

This paper proposes two three-phase five-level power conversion systems. They can be employed in a wind energy converter system (WECS) application as the machine side rectifier, connected to the permanent magnet synchronous machine (PMSM) by an open-end winding (OEW) arrangement. Compared to the conventional topology, proposed ones lack the use of six clamping diodes in their structures. Even though, they also achieve the same power quality as the conventional one. Besides, proposed configurations may have fewer semiconductor devices in the current path, providing slightly lower power losses. Furthermore, the control system used ensures the synchronization between voltage and current, providing a high power factor operation. The converter equations, pulse-width modulation technique, and control strategy are detailed. Simulation and experimental results are provided in order to confirm their performance and feasibility.

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Model-centric volumetric point cloud attributes

arXiv

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arXiv 2021年

作者： de Queiroz, Ricardo L. Dorea, Camilo Freitas, Davi R. Krivokuća, Maja Sandri, Gustavo P. Computer Science Department Universidade de Brasilia Brasilia Brazil Post-Graduate Program at the Electrical Engineering Science Department Universidade de Brasilia Brasilia Brazil INRIA Rennes France Federal Institute of Brasilia Brasilia Brazil

Point clouds have recently gained interest, especially for real-time applications and for 3D-scanned material, such as is used in autonomous driving, architecture, and engineering, to model real estate for renovation or display. Point clouds are associated with geometry information and attributes such as color. Be the color unique or direction-dependent (in the case of plenoptic point clouds), it reflects the colors observed by cameras displaced around the object. Hence, not only are the viewing references assumed, but the illumination spectrum and illumination geometry is also implicit. We propose a model-centric description of the 3D object, that is independent of the illumination and of the position of the cameras. We want to be able to describe the objects themselves such that, at a later stage, the rendering of the model may decide where to place illumination, from which it may calculate the image viewed by a given camera. We want to be able to describe transparent or translucid objects, mirrors, fishbowls, fog and smoke. Volumetric clouds may allow us to describe the air, however "empty", and introduce air particles, in a manner independent of the viewer position. For that, we rely on some eletromagnetic properties to arrive at seven attributes per voxel that would describe the material and its color or transparency. Three attributes are for the transmissivity of each color, three are for the attenuation of each color, and another attribute is for diffuseness. These attributes give information about the object to the renderer, with whom lies the decision on how to render and depict each object. © 2021, CC BY.

关键词： Color

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Three-Phase Integrated PFC AC-AC Half-Bridge Boost Rectifier and Class D Resonant Inverter with Weak Coupled Coils for IH Application

Three-Phase Integrated PFC AC-AC Half-Bridge Boost Rectifier...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Ruan C. M. Gomes Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering (PPgEE–COPELE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

ISBN: (数字)9781728148298

ISBN: (纸本)9781728148304

This paper presents a three-phase integrated PFC AC-AC resonant inverter with boost effect for Induction Heating (IH) Application. This converter is composed by three independent half-bridge boost rectifier and class D resonant inverters with non-smoothed DC link that achieve high power factor operation. The magnetic coupling of the three coils was measured for characterizing the resonant behavior of the arrangement. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).

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Realizing and Experimentally Testing a Reluctance-Based Magnetic Lead Screw 19

Realizing and Experimentally Testing a Reluctance-Based Magn...

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19th International Symposium on Electromagnetic Fields in Mechatronics, electrical and Electronic engineering, ISEF 2019

作者： Cirolini, Mateus Filho, Aly Ferreira Flores Eckert, Paulo Roberto Franchi, Lucas Dalla Corte Federal University of Rio Grande Do sul Post-Graduate Program in Electrical Engineering Porto Alegre90035-190 Brazil

ISBN: (纸本)9781728115603

This paper presents the realization and the experimental tests of a new type of reluctance-based magnetic lead screw (RBMLS) that is attractive for many potential applications. The proposed topology presents structure simplification with the implementation of discretized permanent magnets (PM) and ferromagnetic semi-rings. The proposed RBMLS has PMs only in one of its movable parts, making it suitable for long-stroke applications. The dynamic experimental results for the realized prototype are going to be compared to the 3-D finite-element method (FEM) outcomes. Experimental static results have already been obtained and show good agreement. © 2019 IEEE.

关键词： Screws

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A Single-Phase Five-Level Grid-Connected Inverter for Photovoltaic Applications

A Single-Phase Five-Level Grid-Connected Inverter for Photov...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Jadyson J. Silva A. C. Bahia Filipe P. N. Tahim Andre Darlan A. Fernandes Fabiano F. Costa Post-graduate Program in Electrical Engineering PPGEE- UFBA Salvador Bahia Brazil Federal University of Bahia- UFBA Salvador Bahia Brazil Federal University Federal University of Paraíba - UFPB João Pessoa Paraíba Brazi

With the increasing energy demands and environmental impacts from conventional energy sources, especially fossil fuels, renewable energy sources are increasingly popular. Among which, photovoltaic (PV) energy generation systems stands out due to their ease of installation, maintenance and low acquisition cost. Single-phase PV systems connected to the grid are commonly used in small and medium-sized residential and commercial installations. This paper proposes a single-phase five-level inverter for grid-connected PV systems. A PWM technique is applied to balance the voltages across the dc-link capacitors. Moreover, the technique has a suitable performance in terms of conducting and switching losses. The results shows the effectiveness of the technique for injecting suitable low distorted currents into the grid. Moreover, the system operates correctly to balance the voltages across the dc-link capacitors and under abrupt changes of the available power from the PV panels.

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Design and implementation of synchronous rectification for an arc-welding machine

Design and implementation of synchronous rectification for a...

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2019 IEEE Industry Applications Society Annual Meeting, IAS 2019

作者： Michel, Flavio Marcos Coelho Cardoso, Braz Electrical Engineering Post-Graduate Program Federal University of Minas Gerais Belo Horizonte Brazil Federal University of Minas Gerais Electrical Engineering Department Belo Horizonte Brazil

ISBN: (纸本)9781538645390

In Arc-Welding Machines (AWM), the power-to-weight ration is an important project parameter. This paper brings a proposition to use synchronous rectification to lower rectification stage's power losses on semiconductors, increasing total efficiency. A commercial product was studied, tested and characterized and a synchronous rectifier was then designed to replace the passive diode rectifier. A model of the machine was created and verified by comparison with measured behaviour and then used to simulate the synchronous rectifier application. Simulation results showed a promising reduction in power losses, which could be used in reducing the machine's size or increasing its power rating. In both cases, an improvement of power-to-weight ratio is verified. Ultimately, bench tests and welding tests were made to establish a comparison point between the machine with passive rectifier and the machine with synchronous rectifier. © 2019 IEEE.

关键词： Efficiency

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Prediction of lithium-ion battery capacity in UAVs 6

Prediction of lithium-ion battery capacity in UAVs

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6th International Conference on Control, Decision and Information Technologies, CoDIT 2019

作者： Costa, Erick F. Souza, Darielson A. Pinto, Vandilberto P. Araujo, Miqueias S. Peixoto, Artur M. Da Costa, Erivaldo P. Post-Graduate Program in Electrical and Computer Engineering Federal University of Ceará Brazil Federal University of Rio Grande Do Norte Brazil

ISBN: (纸本)9781728105215

This article proposes a research on degradation of lithium-ion batteries. The life of these batteries can be measured by monitoring capacity degradation. A dataset made available by NASA for the present study was used. Also, 3 methods were used to predict the failure. The methods were Non-recursive Least Squares, a Kalman Filter and an ELM neural network with a very simple architecture, but the results achieved good results and can be compared to other more robust algorithms. © 2019 IEEE.

关键词： Kalman filters

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The modeling of 80 mm diameter cross flow turbine runner for mini/microhydro environmentally friendly power plant 8

The modeling of 80 mm diameter cross flow turbine runner for...

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8th International Seminar on New Paradigm and Innovation on Natural Sciences and Its Application, ISNPINSA 2018

作者： Purwanto Budiyono Hermawan Diponegoro University Post Graduate Program Semarang Indonesia Vocational School Diponegoro University Semarang Indonesia Electrical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia

Indonesian river's potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Indonesia have only reached the point of 4.5% while National Energy Management Blueprint in 2050 targeted 31% of renewable energy (RE) is coming from Micro hydro energy. The applications of 80 mm diameter cross flow turbine in a household scale have drawn an increase in its experience with 450 Watts of power produced through small discharge of 20 liters/second and 3-meter head. Cross flow turbines testing in 130 mm length and 80 mm diameter conducted using Mini/micro hydropower Plant in environmentally friendly power House drum. Lower investment and operational design cost also to be made on its aim to reach community group or individual segments. © Published under licence by IOP Publishing Ltd.

关键词： Investments

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