检索结果-内蒙古大学图书馆

IEEE Energy Conversion Congress and Exposition

作者： Phelipe L. S. Rodrigues Cursino B. Jacobina Antonio M. N. Lima Post-Graduate Program in Electrical Engineering - PPgEE – COPELE Federal University of Campina Grande (UFCG) Paraíba Brazil Federal University of Campina Grande (UFCG) Paraíba Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents a single-phase four-leg ac-dc-ac converter, with one leg shared by the grid side and the load side. The proposed topology can generate input and output voltages with seven levels, presenting reduced harmonic distortion, in addition to using reduced voltage switches. The space-vector pulsewidth modulation strategy (SV-PWM), the control technique, the system model, and a comparison with a three-leg topology will be presented. As for performance comparison parameters, harmonic distortion in currents and voltages, the average switching frequency, and semiconductor losses will be used. The topology was simulated and assembled in the laboratory to obtain experimental results.

关键词： Topology Legged locomotion Switching frequency Mathematical model Switches Pulse width modulation Load modeling

来源：评论

学校读者我要写书评

暂无评论

Zero-Current Switching Clamped Current Converter

Zero-Current Switching Clamped Current Converter

引用

Brazilian Power Electronics Conference, COBEP

作者： Vinicius Freire Bezerra Montiê Alves Vitorino Jens Friebe Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG) Institute for Drive Systems and Power Electronics (IAL) Leibniz Universität Hannover (LUH)

ISBN: (纸本)9781665421300

In this work it is presented a novel Zero-Current Switching Clamped Current (ZCS-CC) Converter that allows soft-switching for a full-bridge DC/DC Current Source Converter (CSC). The soft-switching is achieved using the inherent stray inductance of the switches and diodes, which forms a resonant tank with the output capacitive filter. This period of resonance occurs in the dead time between the two complementary switches of the full-bridge and is enough for both to be comutated with zero current. It is presented the theoretical foundation that justify its operation as well as the simulation and experimental results.

关键词： Inductance Capacitance Power electronics Zero current switching

来源：评论

学校读者我要写书评

暂无评论

Model-centric volumetric point cloud attributes

arXiv

引用

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

来源：评论

学校读者我要写书评

暂无评论

Direct Torque Control Scheme for a Nine-Phase Induction Motor With Reduced Current Harmonic

Direct Torque Control Scheme for a Nine-Phase Induction Moto...

引用

Brazilian Power Electronics Conference, COBEP

作者： Gilielson F. da Paz Isaac S. de Freitas Victor F. M. B. Melo Alexandre G. F. da Silva Post-Graduate Program in Electrical Engineering - PPgEE UFPB Federal University of Paraíba Paraíba Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

This paper discusses a modified Direct Torque Control (DTC) method in order to reduce phase current harmonic distortion in a nine-phase asymmetrical induction motor drive system. Since the classical DTC is a direct adaptation from the three-phase case, it does not take into account the presence of the non-producing torque current components obtained from the Space Vector Decomposition (SVD) technique. Thus, in classical DTC these non-producing torque components assume high amplitudes, causing distortion in phase currents. In this way, it is shown that modified DTC minimizes the undesired components, reducing significantly the distortion in phase currents while maintaining the fast dynamic response of classical DTC.

关键词： Torque Stators Switches Harmonic distortion Rotors Torque control

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

Design and implementation of synchronous rectification for a...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Scalable modeling and synthesis of on-chip spiral inductors 4

Scalable modeling and synthesis of on-chip spiral inductors

引用

4th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2019

作者： Bernardo, Marcos Gomes Freire, Raimundo Carlos S. De Souza, Antonio Augusto Lisboa Melo, Erico Castro A. Post-Graduation Program in Electrical Engineering PPgEE/UFCG Federal University of Campina Grande UFCG Campina Grande PB Brazil Federal University of Paraiba UFPB João Pessoa PB Brazil

ISBN: (纸本)9781728121093

In this paper, an efficient synthesis for integrated spiral inductors based on particle swarm optimization is presented. The synthesis/optimization process aims to determine the inductor layout parameters that maximize the quality factor while considering the imposed restrictions (project specifications). The spiral inductors are modeled using a double-π scalable model, in which the design parameters of inductor are taken as input. All the elements of the scalable model are calculated from the scalable expressions and process parameters. Particle swarm optimization is used to explore the design space and resolution of the optimization problem. Three design examples of inductors with inductance values of 3 nH, 5.5 nH and 8 nH, and with operating frequency of 2 GHz, 3.5 GHz and 5 GHz are used to evaluate the synthesis process. The obtained results confirm the validity of the adopted methodology and the PSO efficiency in determining the most adequate inductor structure to the project specifications. © 2019 IEEE.

关键词： Particle swarm optimization (PSO)

来源：评论

学校读者我要写书评

暂无评论

Prediction of lithium-ion battery capacity in UAVs 6

Prediction of lithium-ion battery capacity in UAVs

引用

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

来源：评论

学校读者我要写书评

暂无评论

Hybrid Converter with Reduced DC-link Voltage Using an H-Bridge Cell for Split-Phase Power System

Hybrid Converter with Reduced DC-link Voltage Using an H-Bri...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Bruna S. Gehrke Cursino B. Jacobina Italo R. F. M. P. da Silva Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) – Campina Grande - PB - Brazil Academy Unit of the Cabo de Santo Agostinho Federal Rural University of Pernambuco (UFRPE) Cabo de Santo Agostinho PE Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents a single-phase to single-phase three-wire converter, which comprises a conventional two-level(2L) four-leg converter in series with H-bridge. The H-bridges are supplied from the main converter by means of a DC-DC converter with a high-frequency transformer. The proposed converter: (i) can supply three loads, wherein two are phase voltages 180 degrees-lagged, and a third load with twice the amplitude of the phase voltage, (ii) has the output voltages with constant frequency and amplitude even under unbalanced loads, and (iii) has sinusoidal grid current and high-power factor even supplying nonlinear loads. In this way, the proposed system is suitable for uninterruptible power supply. Furthermore, the pulsewidth modulation (PWM) technique is proposed to generate the pole voltages of the converters, so that the output voltages have better power quality. The proposed converter is compared with a conventional 2L in terms of harmonic distortion. Simulated results are provided to verify the operation of the proposed system.

关键词： Voltage control DC-DC power converters Pulse width modulation Frequency conversion Legged locomotion Uninterruptible power systems

来源：评论

学校读者我要写书评

暂无评论

DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix Inverter

DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix...

引用

European Conference on Power Electronics and Applications

作者： Ailton do E. Dutra 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

In this work it is proposed a multilevel T-type configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of two DC/DC-pulsating converters cascaded with a DC-link capacitor-less three-phase three-level T-type inverter. Due to the absence of DC-link electrolytic capacitors, the proposed inverter guarantees a long lifetime and high power density. The DC-DC-pulsating converters aim to generate the high-frequency pulsating DC-link waveform profiles which have to be synchronized with the three-phase inverter PWM. Comparing to the conventional PWM, the proposed technique presents reduced switching losses due to the fact only one leg commutes during a switching period while the other two legs keep clamped in high or low impedance. Details of control strategy and modulation are presented, such as experimental results to validate the theoretical approach.

关键词： Inverters Legged locomotion Europe Capacitors Pulse width modulation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：