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

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

引用

2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

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

ISBN: (纸本)9798350316445

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. © 2023 IEEE.

关键词： battery mode discharger interleaved boost normal mode

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Vivaldi Antipodal Antenna with triangular slots fed by air-filled RSIW for UWB applications 1

Vivaldi Antipodal Antenna with triangular slots fed by air-f...

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1st IEEE Latin American Conference on Antennas and Propagation, LACAP 2024

作者： de Carneiro, Priscilla Kadja P.M. Da Souza, Juliete S. Neto, Alfredo Gomes Serres, Georgina Karla de F. Herbster, Adolfo F. Serres, Alexandre Jean R. Federal University of Campina Grande UFCG Graduate Program in Electrical Engineering Campina Grande Brazil GTEMA Federal Institute of Paraíba IFPB Group of Telecommunications and Applied Electromagnetism João Pessoa Brazil Federal University of Campina Grande UFCG Department of Electrical Engineering Campina Grande Brazil

ISBN: (纸本)9798331527587

This paper presents a modified Vivaldi antipodal antenna using air-filled RSIW technology for UWB applications. The structure has a triangular slot edge, extending the bandwidth and increasing the gain. A prototype of the modified antenna was simulated and fabricated. The measured results show reasonable agreement with simulations, validating the design procedure. The proposed antenna offers a low-cost, easy-to-manufacture and compact solution. Additionally, improvements in performance were observed, including a 1 GHz increase in bandwidth and an additional 1.58 dB in gain, compared to the antenna using only the RSIW technology. © 2024 IEEE.

关键词： Substrate integrated waveguides

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Deep Convolutional Neural Networks for Accurate Solar Module Classification in Thermal Images 12

Deep Convolutional Neural Networks for Accurate Solar Module...

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12th International electrical engineering Congress, iEECON 2024

作者： Phungket, Chutinun Nangthin, Prasit Pathumwan Institute Of Technology The Graduate Program Faculty Of Engineering Faculty Of Engineering Bangkok Thailand Pathumwan Institute Of Technology Faculty Of Engineering Department Of Electrical Engineering Bangkok Thailand

ISBN: (纸本)9798350383591

The rapid and continuous technological advancements in computer and internet technologies, combined with data management techniques, find applications in various domains. For example, they aid in predictive maintenance systems, evaluate the performance of solar modules, and differentiate efficiently performing solar modules from less efficient ones using thermal imagery. The accuracy of solar module classification significantly impacts the subsequent assessment. In this study, we employ advanced techniques, particularly deep learning through Convolutional Neural Networks (CNN), to classify thermal images of solar modules. The practical aspects of applying CNN to the dataset of thermal images are explored, including transfer learning from pretrained CNN architectures and custom CNN architecture training. Experiments are conducted with three prominent types of solar module conditions: normal, cracked, and dusty. The results reveal that the most effective approach involves learning and fine-tuning pre-trained architectures on detailed studies, achieving a classification accuracy of up to 94.5% © 2024 IEEE.

关键词： Convolutional neural networks

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On Reliability Assessment of a Battery Energy Storage Systems Supporting PV Plants 8

On Reliability Assessment of a Battery Energy Storage System...

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8th Southern Power Electronics Conference and the 17th Brazilian Power Electronics Conference, SPEC / COBEP 2023

作者： Amorim, William Caires Silva Cupertino, Allan Fagner Mendes, Victor Flores De Sousa, Renata Oliveira De Barros, Rodrigo Cássio Pereira, Heverton Augusto Federal University of Minas Gerais Graduate Program in Electrical Engineering Belo Horizonte Brazil Federal University of Juz de Fora Department of Electrical Energy Juiz de Fora Brazil Federal University of Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil Federal University of Tech. - Paraná Department of Electronics Curitiba Brazil Federal University of Recôncavo da Bahia Department of Electrical Engineering Cruz das Almas Brazil Federal University of Viçosa Department of Electrical Engineering Viçosa Brazil

ISBN: (纸本)9798350321128

Battery energy storage system (BESS) has been highlighted for its possibilities of performing ancillary services to the power system, such as voltage and frequency regulation, power quality, power smoothing, and peak shaving, among others. The BESS is very promising especially associated with renewable energies, such as photovoltaic (PV) and wind. Among some of these ancillary services, this work evaluates the battery lifetime and reliability. The proposed methodology includes the combined analysis of rainflow counting algorithm, Monte Carlo simulation, and nonlinear damage accumulation rule for battery reliability assessment. Monte Carlo simulation is used to approximate the battery reliability estimation of practical applications, by considering stochastic variations in the battery lifetime model. The case study is based on a 100 kW PV system, assessed using a one-year mission profile of solar irradiance and ambient temperature from Goiânla-Brazll associated with a mission profile of 100 kW industrial load. The PV plant is connected to a 440 V grid associated with a BESS that mitigates oscillations of 10% of PV nominal power per minute. The peak shaving service presented a decrease in the battery lifetime by approximately 11 % in relation to the deterministic battery lifetime analysis. On the other hand, the peak shaving presented a decrease in the battery lifetime by approximately 17.4 %. In addition, the pack-level analysis revealed a maximum reduction in the battery lifetime by approximately 30%, when compared to the conventional deterministic battery reliability estimation procedure. © 2023 IEEE.

关键词： Battery energy storage system mission profile Monte Carlo peak shaving power smoothing reliability

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Applied Depthwise Separable-based Convolutional Neural Network Classification on MobileNet Algorithm for Human Fall Detection 12

Applied Depthwise Separable-based Convolutional Neural Netwo...

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12th International electrical engineering Congress, iEECON 2024

作者： Sakarin, Pipat Sitjongsataporn, Suchada Mahanakorn University Of Technology The Electrical Engineering Graduate Program Faculty Of Engineering And Technology Bangkok Thailand Mahanakorn University Of Technology Department Of Electronic Engineering Bangkok Thailand

ISBN: (纸本)9798350383591

This paper presents the human fall detection by convolutional neural network (CNN) classification and MobileNet algorithm. In order to reduce the number of parameter, we propose a vision-based fall detection model, that is called 'Applied Depthwise separable-based CNN-MobileNet (ACM) algorithm'. This model is based on CNN, deptwise convolution and pointwise convolution of MobileNet algorithm. Experimental results show the accuracy of proposed ACM model about 97.68% and number of parameters of proposed ACM model is less than conventional CNN model. © 2024 IEEE.

关键词： Convolution

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Threshold-Based Electroencephalography Brain-Computer Interface for Robot Arm Control 8

Threshold-Based Electroencephalography Brain-Computer Interf...

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8th Asia-Pacific Conference on Intelligent Robot Systems, ACIRS 2023

作者： Rusydi, Muhammad Ilhamdi Amrina, Elita Winata, Yoan Ramadhani, Salisa Nofendra, Riko Graduate School Universitas Andalas Engineering Faculty Program of Engineer Professional Education Electrical Engineering Department Padang Indonesia Universitas Andalas Engineering Faculty Electrical Engineering Department Padang Indonesia

ISBN: (纸本)9798350302851

Brain-Computer Interface (BCI) is a technique that uses real-Time brain impulses to connect with and control external devices. BCI provides a new method for controlling external devices by translating brain signals into computer commands, facilitating the daily lives of people with disabilities and enhancing their ability to exhibit expected behavior. A Brain-Computer Interface (BCI) system based on Electroencephalography (EEG) was built to control the robotic arm. The EEG signals utilized included both eyes blinking, the right eye, the left eye, and the jaw contraction. EEG data were recorded from seven healthy subjects. The threshold approach is used to classify EEG signals, with the feature employed being the amplitude of the EEG signal. The highest threshold value for the blinking signal was 0.6 mV with an accuracy of 97.9%, while the best threshold value for jaw contraction was 0.4 mV with an accuracy of 93.34 percent. The healthy, inexperienced participants took part in system testing. The total results of testing each robot movement yielded an overall success rate of 84.52 percent. Therefore, it was determined that the system could facilitate the operation of the length robot even if the user lacked prior experience with EEG-based systems. © 2023 IEEE.

关键词： Brain computer interface

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Analysis of a Novel High Power-Density Semiconductor-Level Interleaved Converter 8

Analysis of a Novel High Power-Density Semiconductor-Level I...

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8th Southern Power Electronics Conference and the 17th Brazilian Power Electronics Conference, SPEC / COBEP 2023

作者： Biajo, Vitor H. M. Lobato, Gideon I. C. Silva, Sidelmo M. Universidade Federal de Minas Gerais Graduate Program in Electrical Engineering Belo Horizonte31270-901 Brazil

ISBN: (纸本)9798350321128

This paper introduces a novel interleaved inverter topology for DC-AC conversion in power electronics applications. The proposed topology leverages a semiconductor-level interleaving technique to overcome the limitations of conventional interleaved inverters. Through comprehensive analysis and simulation studies, it is demonstrated that the interleaved inverter achieves higher power density and improved ripple frequency as compared to conventional counterparts. One of the main advantages of the proposed technology over conventional interleaving converters is the use of a single inductor, which enables its use not only in grid-tied applications but also in electric drives. © 2023 IEEE.

关键词： DC-AC conversion interleaved converters pulse-width modulation single-phase inverters

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Experimental Evaluation of a Lightweight and Backdrivable Powered Knee Prosthesis for Transfemoral Amputees 1

Experimental Evaluation of a Lightweight and Backdrivable Po...

引用

1st IEEE Colombian Caribbean Conference, C3 2023

作者： Ulhoa, Pedro Fiorezi, Guilherme Filho, Teodiano Andrade, Rafhael Universidade Federal Do Espírito Santo Department of Electrical Engineering Vitória Brazil Universidade Federal Do Espírito Santo Department of Mechanical Engineering Vitória Brazil Universidade Federal Do Espírito Santo Graduate Program in Electrical Engineering Vitória Brazil Universidade Federal Do Espírito Santo Graduate Program in Mechanical Engineering Vitória Brazil

ISBN: (纸本)9798350341799

Rehabilitation of amputees is still mostly limited to passive technology that cannot provide energy to the gait and contribute to a better experience and comfort of walking. To address this shortcoming, active prostheses have been introduced with actuators capable of generating and dissipating energy in a controlled way. However, proposed designs of powered leg prosthesis still present heavy and bulky structure or low backdrivable actuators, which reduce the volitional control and comfort of the user. This work presents the development and control of a lightweight and highly backdrivable powered knee prosthesis. The designed actuator is composed by a coaxial motor-reducer with a 200 W brushless DC motor in series with a harmonic drive with a 51:1 ratio. After assembled the leg prosthesis weights just 3.64 kg. Bench tests were performed to validate the model and tune a position-based controller. Then, a custom force sensor was implemented to measure ground reaction force and identify gait phases so an impedance controller can regulate joint torque. The powered prosthesis was experimented in three able-bodied subjects walking on a treadmill using both the position and impedance controller. The prosthesis presented high backdrivability in bench tests and the treadmill results shown that the proposed impedance controller was more effective to follow the healthy knee trajectory compared to the position controller. In future works we plan to evaluate the prosthesis in amputee subjects. © 2023 IEEE.

关键词： Controllers

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A Zero Harmonic Distortion Grid-Forming Converter for Islanded Microgrids

A Zero Harmonic Distortion Grid-Forming Converter for Island...

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2023 IEEE Industry Applications Society Annual Meeting, IAS 2023

作者： Ramos, Gabriel V. Parreiras, Thiago M. Brandao, Dener A. De L. Silva, Sidelmo M. Filho, Braz De J. C. Universidade Federal de Minas Gerais Graduate Program in Electrical Engineering MG Belo Horizonte31270-901 Brazil Centro Federal de Educacão Tecnológica de Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil Universidade Federal de Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil

ISBN: (纸本)9798350320169

The world has been experiencing a fast change in the production and use of electrical energy. The electric power system is fast changing from the conventional centralized generation to a more distributed generation (DG) with renewable energy sources installed near the consumers. The evolution of DG paves the way for the concept of grid-forming converters improving voltage and frequency stability in microgrids (MGs) and islanded applications, due to the growth of inverter-based resources. In islanded MG, power quality is a concern due to the presence of disturbing loads and possible resonance issues encountered with multiple electronically interfaced distributed energy resources (DERs) and loads. The present work proposes the application of the Zero Harmonic Distortion Converter (ZHD) as a grid-forming converter due to its inherently sinusoidal voltage source characteristic without the need of capacitive filtering elements that negatively impact in costs, efficiency, size and can be a source of resonances issues. These features are achieved by the proper combination of harmonic cancellation in a three-winding transformer and harmonic elimination using the Selective Harmonic Elimination Pulse Width Modulation (SHE PWM). Simulation results show the ZHD converter setting voltage and frequency to an islanded microgrid, delivering sinusoidal voltage waveforms even in the presence of nonlinear loads. The converter is able to maintain the voltage distortion below the IEEE 519 limits by respecting the current harmonic limits imposed by the same standard. © 2023 IEEE.

关键词： Harmonic distortion

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Balancing Dual DC Voltage Control in Quasi Single-Stage Converter for Low-Voltage Energy Storage System Grid-Connected 20

Balancing Dual DC Voltage Control in Quasi Single-Stage Conv...

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20th International Conference on electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2023

作者： Manokum, Warissara Kumsuwan, Yuttana Faculty of Engineering Chiang Mai University Graduate Program in Electrical Engineering Department of Electrical Engineering Chiang Mai Thailand Provincial Electricity Authority Bangkok Thailand Chiang Mai University Faculty of Engineering Department of Electrical Engineering Chiang Mai Thailand

ISBN: (纸本)9798350310467

The aim of a bidirectional quasi single-stage converter (QSSC) for low-voltage energy storage systems that are grid-connected is to reduce the power conversion stage of the dc-dc converter, which results in improved overall efficiency. The QSSC configuration relies on a modified modulation strategy due to the unequal dual dc port (upper and lower dc ports) voltage. The control for ensuring that the dual dc port voltages are equal is presented in this paper. When the lower dc port is varied in response to battery voltage, another is controlled to track in response to the lower dc port, so that the voltage ratio between the upper and lower dc port is always equal to one. Furthermore, power sharing in a dual dc port is equal, which means that a dc-dc converter automatically operates at 50% of the battery power. Thus, the existing modulation can be used and the power stage conversion of the dc-dc converter can be decreased. The proposed control for the QSSC is verified with simulation results. © 2023 IEEE.

关键词： Energy storage

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