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Power Electronics and Control (SEPOC), Seminar on

作者： Conrado Gomes Marques João Pedro Scherer Cipriani Maicon Wellington Dickow Leandro Roggia Jonas Roberto Tibola Álysson Raniere Seidel Electrical Engineering Post-Graduation Program Federal University of Santa Maria (UFSM) Santa Maria RS Industrial Technical School of Santa Maria (CTISM - UFSM) Santa Maria RS

ISBN: (数字)9798350379419

ISBN: (纸本)9798350379426

This paper presents the integration of a variable inductor into a dual-active-bridge (DAB) converter for battery charging applications, emphasizing efficiency improvements. The variable inductor introduces an additional degree of freedom to conventional single-phase-shift modulation. By adjusting the inductance, the converter achieves optimal soft switching and minimizes current circulation, surpassing the performance of the traditional phase-shift method with a fixed inductor, specially under extreme output power conditions. To validate this approach, a 600 W prototype converter was developed to charge a lead-acid battery-bank. The efficiency of the DAB with the variable inductor was measured and compared to that of the DAB with fixed inductor across the full range of the battery voltage and power. Experimental results demonstrate that the DAB converter with variable inductor achieves superior performance for battery charging compared to the traditional DAB with fixed inductor under both low and high-load conditions.

关键词： Seminars Inductance Voltage measurement Soft switching Switching loss Prototypes Switched reluctance motors Batteries Inductors Voltage control

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Towards System Security: What a Comparison of National Vulnerability Databases Reveals

Towards System Security: What a Comparison of National Vulne...

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Iberian Conference on Information Systems and Technologies (CISTI)

作者： Igor Forain Robson de Oliveira Albuquerque Rafael Timó teo de Sousa Jú nior Electrical Engineering Department Professional Post-Graduation Program in Electrical Engineering - PPEE Faculty of Technology University of Bras&#x00ED lia (UnB) Bras&#x00ED lia Brazil

System vulnerabilities are ubiquitous nowadays. In 2021, millions of cyberattacks exploited system flaws resulting in billions of losses. Despite massive vulnerability databases supported by the USA and China governments, there are still several unknown issues between them. This paper proposes a methodology to compare the National Vulnerability Database (NVD), the China National Vulnerability Database (CNVD), and the China National Vulnerability Database of Information Security (CNNVD). The results reveal that the CNNVD has 1,661 vulnerabilities entries more than the NVD and at least 40 more entries regarding Chinese vendors. Moreover, there is a temporal correlation of 0.917560 between the NVD and CNNVD. To the best of the authors’ knowledge, this work is the first to normalize and compare the NVD, CNVD, and CNNVD using their data feeds.

关键词： Measurement Correlation Databases XML Legislation Information security Software

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Single-Phase Transformerless UPS with Interleaved Boost Converters for Battery Discharging

Single-Phase Transformerless UPS with Interleaved Boost Conv...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Alan R. A. Pinto Filipe A. C. Bahia Reuben P. R. Souza José R. Pinheiro Fabiano F. Costa Post-Graduate Program in Electrical Engineering PPGEE Federal University of Bahia Salvador Brazil Dept. of Electrical and Computer Engineering DEEC Federal University of Bahia Salvador Brazil Dept. of Electrical Engineering DEE Federal University of Campina Grande Campina Grande Brazil

This paper proposes a reconfiguration for a single-phase, double conversion uninterruptible power supply (UPS). With the addition of two static switches to the original circuit, the UPS mitigates the ripple in the current, through battery discharge performed by two legs. Other than these switches, the circuit topology is preserved. The preliminary results show a satisfactory level of ripples for the inductor current and suitable power quality for the output voltage.

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An Efficient Three-Factor Authenticated Key Agreement Technique Using FCM Under HC-IoT Architectures

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Computers, Materials & Continua 2022年第7期72卷 1373-1389页

作者： Chandrashekhar Meshram Agbotiname Lucky Imoize Sajjad Shaukat Jamal Parkash Tambare Adel R.Alharbi Iqtadar Hussain Department of Post Graduate Studies and Research in Mathematics Jayawanti Haksar Government Post-Graduation CollegeCollege of Chhindwara UniversityBetul460001M.P.India Department of Electrical and Electronics Engineering Faculty of EngineeringUniversity of LagosAkokaLagos100213Nigeria Department of Electrical Engineering and Information Technology Institute of Digital CommunicationRuhr University44801BochumGermany Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia Water Resources&Applied Mathematics Research Lab Nagpur440027India College of Computing and Information Technology University of TabukTabuk71491Saudi Arabia Mathematics Program Department of MathematicsStatistics and PhysicsCollege of Arts and SciencesQatar University2713DohaQatar

The Human-Centered Internet of Things(HC-IoT)is fast becoming a hotbed of security and privacy *** users can establish a common session key through a trusted server over an open communication channel using a three-party authenticated key *** of the early authenticated key agreement systems relied on pairing,hashing,or modular exponentiation processes that are computationally intensive and *** order to address this problem,this paper offers a new three-party authenticated key agreement technique based on fractional chaotic *** new scheme uses fractional chaotic maps and supports the dynamic sensing of HC-IoT devices in the network architecture without a password *** projected security scheme utilized a hash function,which works well for the resource-limited HC-IoT *** results show that our new technique is resistant to password guessing attacks since it does not use a ***,our approach provides users with comprehensive privacy protection,ensuring that a user forgery attack causes no ***,our new technique offers better security features than the techniques currently available in the literature.

关键词： Three-party authenticated key agreement anonymity fractional chaotic maps Chebyshev polynomial password table human-centered internet of things(HC-IoT)

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Information Gain applied to reduce model-building time in decision-tree-based intrusion detection system

Information Gain applied to reduce model-building time in de...

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Iberian Conference on Information Systems and Technologies (CISTI)

作者： Moisé s S. De Sousa Carlos Eduardo Lacerda Veiga Robson De O. Albuquerque William F. Giozza Professional Post-Graduation Program in Electrical Engineering&#x2013 PPEE&#x2013 Electrical Engineering Department Faculty of Technology University of Bras&#x00ED lia (UnB) Bras&#x00ED lia Brazil Advocacia-Geral da Uni&#x00E3 o Bras&#x00ED

Due to the large amount of sensitive data generated by websites, it is possible to understand the progress of attacks to their databases. This work proposes an intrusion detection system based on data mining and machine learning techniques to detect and mitigate the damage caused by these attacks. It adopts the Information Gain method of selecting attributes in order to reduce the model-building time without affecting the classification performance. Using the CIC-IDS 2017 dataset, this work shows how different decision tree algorithms (Random Forest and J48 Algorithm) behave even if they receive equal parameters and data. Using Information Gain to select attributes, the proposed system achieves a processing time reduction of up to 90%.

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Multilevel Single-Phase Four-Leg AC-DC-AC Converter 12

Multilevel Single-Phase Four-Leg AC-DC-AC Converter

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Rodrigues, Phelipe L. S. Jacobina, Cursino B. Lima, Antonio M. N. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Paraíba58429-900 Brazil Department of Electrical Engineering Campina Grande Paraíba58429-900 Brazil

ISBN: (纸本)9781728158266

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. © 2020 IEEE.

关键词： Topology

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Dual Vienna Rectifiers with a Single Dc-link for Wind Energy Conversion System Applications 12

Dual Vienna Rectifiers with a Single Dc-link for Wind Energy...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Monteiro, Amanda P. Jacobina, Cursino B. Bahia, Filipe A. C. Sousa, Reuben P. R. Post-Graduate Program in Electrical Engineering PPgEE/COPELE Campina Grande Paraíba58429-900 Brazil Salvador Bahia40210-630 Brazil

ISBN: (纸本)9781728158266

In this paper, dual Vienna rectifiers are proposed for Wind Energy Conversion System (WECS) applications with Open-End Winding (OEW) Permanent Magnet Synchronous Generator (PMSG). Due to the reduced number of controlled switches, the proposed topologies have reduced costs and high reliability. Besides, they provide a better power quality using the same number of controlled switches than conventional structures presented in the literature, making them very attractive options for industry applications. The system model, space vector modulation, and control strategy are given. Simulation results are provided in order to validate their performance and feasibility. © 2020 IEEE.

关键词： Vector spaces

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Universal Active Power Filter Based on AC-DC-AC Converter with Six Controlled Switches for Single-Phase Systems 12

Universal Active Power Filter Based on AC-DC-AC Converter wi...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Rodrigues, Phelipe L. S. Jacobina, Cursino B. Lima, Antonio M. N. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba58429-900 Brazil Department of Electrical Engineering Campina Grande Paraíba58429-900 Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158266

This paper presents an ac-dc-ac converter with six controlled switches for single-phase systems applied as a universal active power filter (UAPF). The proposed topology is feasible for compensating voltages swells and harmonics generated by nonlinear loads. The difference between the conventional and proposed topology is the replacement of a controlled leg (composed of IGBTs) for an uncontrolled leg (composed only of diodes). For performance comparisons, current THD, switching and conduction losses of the semiconductors, average switching frequency, and power in the transformer were used as parameters. Control and pulsewidth modulation techniques based on space vector approaches were developed to eliminate zero-crossing distortions caused by the use of the uncontrolled leg. Simulation and experimental results were presented for validation of the mathematical model. © 2020 IEEE.

关键词： Topology

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Triple RSIW Fed Antipodal Vivaldi Antenna for Bandwidth Improvement

Triple RSIW Fed Antipodal Vivaldi Antenna for Bandwidth Impr...

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European Conference on Antennas and Propagation, EuCAP

作者： Camila C. R. de Albuquerque Alfrêdo Gomes Neto Alexandre M. de Oliveira Georgina K. de F. Serres Alexandre Jean René Serres Post-Graduation Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil Post-Graduation Program in Electrical Engineering Federal Institute of Paraiba João Pessoa Brazil Maxwell Laboratory of Microwaves and Applied Electromagnetism Federal Institute of São Paulo Cubatão Brazil

In this paper, it is presented a new modified structure of antipodal Vivaldi antenna (AVA). The structure is fed by a triple ridged substrate integrated waveguide (RSIW) on a single layer low-cost FR4 substrate. The ridges insertion allows a bandwidth enhancement due to the cut-off frequency decrease and consequently the miniaturization. The new structure is compared to an AVA fed by a classical SIW designed for a cut-off frequency around 4 GHz. Numerical simulations were performed and a bandwidth enhancement of 660 MHz was achieved with a gain of 2.06-7.59dBi within the frequency range.

关键词： Microwave antennas Vivaldi antennas Cutoff frequency Bandwidth Numerical simulation Microwave theory and techniques Indexes

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Wireless sensor network for monitoring reproductive events in cattle 5

Wireless sensor network for monitoring reproductive events i...

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5th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2021

作者： Valadao, Yuri Das Neves Feldman, Max Muller, Ivan Da Silva, Bruno Fontana Menegassi, Silvio Renato Oliveira Federal University of Rio Grande Do sul Electrical Engineering Post Graduation Program Porto Alegre Brazil Instituto Federal Sul-Rio-Grandense Campus Sapiranga Sapiranga Brazil Federal University of Rio Grande Do sul Zootechnics Department Porto Alegre Brazil

ISBN: (纸本)9781728197265

Cattle monitoring is an important demand in precision livestock and crossbreed quality control. Previous studies and products have been proposed to approach this problem, although several factors pose challenges for real-time data acquisition and analysis. In this work, we present a proof of concept prototype for a cattle crossbreed monitoring system based on wireless sensor networks. The hardware implementation, the sensor data acquisition system and the field tests are described in detail. Supervised machine learning algorithms are applied for copulation detection and the classification metrics show that some of the proposed models have good sensitivity, suggesting promising directions for future steps and optimization. © 2021 IEEE.

关键词： Wireless sensor networks

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