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2024 IEEE PES/IAS PowerAfrica, PowerAfrica 2024

作者： Diouf, Alioune Noro, Yasuhiro Electrical Engineering and Electronics Program Kogakuin University Tokyo Japan Kogakuin University Department of Electrical and Electronics Engineering Tokyo Japan

ISBN: (纸本)9798350389388

This paper introduces a grid forming(GFM) inverter equipped with a hybrid islanding detection method which combined the positive feedback(PF) of the point of common coupling(PCC) voltage based active method used and the frequency deviation as a passive method. The proposed algorithm is implemented inside the GFM voltage controller. Furthermore, a frequency deviation threshold is addressed based on a theoretical approach in order to relieve continuous disturbance injection. This hybrid method doesn't undergo a non-detection zone(NDZ) and, an additionally, a continuous operation of the microgrid is achieved. Moreover, the proposed algorithms can distinguish islanding phenomenon against load switching during grid connected mode. The results are evaluated by simulations using ATPdraw software. © 2024 IEEE.

关键词： autonomous operation distributed generators grid forming hybrid islanding detection islanding detection positive feedback

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An Adaptive Secondary Control Based on Recursive Neural Networks for Isolated Microgrids

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2024年第4期22卷 137-142页

作者： Rodríguez, L. Pantoja, A. Revelo, J. Barco-Jiménez, J. Department of Electronics University of Nariño Colombia Program of Electronic Engineering University CESMAG Colombia Postgraduate Programs in Electrical and Electronic Engineering-PPIEE University of Valle Colombia Electrical Engineering Department University of Malaga Spain

This work proposes a model reference adaptive control based on recursive neural networks. This secondary-level controller corrects the deviations on the voltage and frequency setpoints of a simple primary control in an isolated microgrid (MG) with multiple distributed generators (DGs). The controller has two nonlinear autoregressive with external input neural networks to emulate the microgrid and guide the whole system according to an appropriate reference model. The networks are trained with synthetic data from a simulation MG and the order of the networks are obtained with a deterministic method. The method is tested with a three-units MG in a Matlab simulation under different working conditions. Results show the proper performance of the proposed controllers in comparison to a PI strategy. © 2024, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Microgrids

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Compact Model Build Upon Dynamic Weighting Artificial Neural Network Approach for Complementary Field Effect Transistors

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IEEE Transactions on Electron Devices 2024年第1期71卷 246-253页

作者： Butola, Rajat Li, Yiming Kola, Sekhar Reddy National Yang Ming Chiao Tung University Parallel and Scientific Computing Laboratory Electrical Engineering and Computer Science International Graduate Program Hsinchu300093 Taiwan Institute of Pioneer Semiconductor Innovation The Institute of Artificial Intelligence Innovation National Yang Ming Chiao Tung University Parallel and Scientific Computing Laboratory Electrical Engineering and Computer Science International Graduate Program The Institute of Communications Engineering the Institute of Biomedical Engineering Department of Electronics and Electrical Engineering Hsinchu300093 Taiwan

In this work, a dynamic weighting-artificial neural network (DW-ANN) methodology is presented for quick and automated compact model (CM) generation. It takes advantage of both TCAD simulations for high accuracy and SPICE simulations for cost-effectiveness. This methodology is developed for gate-all-around (GAA) silicon (Si) nanosheet (NS) complementary field effect transistor (CFET), a potential candidate for future CMOS technology due to its innate properties. The critical process variation (PV) sources that severely degrade the CFET performance are estimated using DW-ANN. It reduces the computation cost and predicts the effects of PV sources with less than 1% error. Furthermore, a compact DW-ANN-based Verilog-A model has been developed that captures the dc as well as transient behavior accurately for circuit-level analysis. CFET-based circuits such as inverter, 6T-static random access memory (SRAM), and ring oscillator (RO) are characterized and implemented using DW-ANN-based CM. The overall average error of the model is reported as less than 2%. Therefore, the proposed device and circuit modeling approach provides a feasible solution for the rapid compact modeling of new emerging devices with good convergence and high accuracy. © 1963-2012 IEEE.

关键词： Neural networks

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EfficientSpeech: An On-Device Text to Speech Model 48

EfficientSpeech: An On-Device Text to Speech Model

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48th IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2023

作者： Atienza, Rowel University of the Philippines Electrical and Electronics Engineering Institute Ai Graduate Program Philippines

ISBN: (纸本)9781728163277

State of the art (SOTA) neural text to speech (TTS) models can generate natural-sounding synthetic voices. These models are characterized by large memory footprints and substantial number of operations due to the long-standing focus on speech quality with cloud inference in mind. Neural TTS models are generally not designed to perform standalone speech syntheses on resource-constrained and no Internet access edge devices. In this work, an efficient neural TTS called EfficientSpeech that synthesizes speech on an ARM CPU in real-time is proposed. EfficientSpeech uses a shallow non-autoregressive pyramid-structure transformer forming a U-Network. EfficientSpeech has 266k parameters and consumes 90 MFLOPS only or about 1% of the size and amount of computation in modern compact models such as Mixer-TTS. EfficientSpeech achieves an average mel generation real-time factor of 104.3 on an RPi4. Human evaluation shows only a slight degradation in audio quality as compared to FastSpeech2. © 2023 IEEE.

关键词： CMOS FLOPS parameters RTF TTS

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PV and Battery Sizing and Cost Study for Small Remote Islands Considering Load Demand Peak Shift 13

PV and Battery Sizing and Cost Study for Small Remote Island...

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13th International Conference on Power, Energy and electrical engineering, CPEEE 2023

作者： Kitalong, Clarence Noro, Yasuhiro Electrical Engineering and Electronics Program Kogakuin University Tokyo Japan Kogakuin University Department of Electrical and Electronic Engineering Tokyo Japan

ISBN: (纸本)9781665490146

This paper discusses energy and cost comparison for 9 different combinations of Photovoltaic (PV) and Lithium-Ion Battery Energy Storage System (BESS) sizes with load demand peak changes for the Kayangel Power System (KPS). 9 PV and BESS combinations were modeled with the existing 90kW Diesel Generator (DG) and simulated while analyzing the kWh energy values of DG operation, PV curtailment and battery power flow energy values. A comparative cost analysis was then conducted on these 3 energies using Installation Costs (IC), diesel fuel costs and energy charge costs. Following this, the study was expanded to a 20-year time period for more complete system lifetime cost estimations. Simulated energy losses and system costs showed mostly favorable values during increased PV and BESS sizes and shifted load demand peak. Simulation results also identified combinations where increased sizing and shifted load demand peak made little difference. © 2023 IEEE.

关键词： Energy dissipation

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Battery Energy Storage System Supporting Frequency Regulation of Power System with High Renewable Penetration 13

Battery Energy Storage System Supporting Frequency Regulatio...

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13th International Conference on Power, Energy and electrical engineering, CPEEE 2023

作者： Nzimande, Nomvelo Noro, Yasuhiro Kogakuin University Electrical Engineering and Electronics Program Tokyo Japan Kogakuin University Department of Electrical and Electronic Engineering Tokyo Japan

ISBN: (纸本)9781665490146

The utilization of renewable energy (RE) has increased worldwide because it is one of the effective ways to minimize greenhouse gases. The power outputs of photovoltaic (PV) and wind farms depend on weather conditions. High penetration of intermittent renewable energy (IRE) will put pressure on frequency regulation, and frequency fluctuation will increase because IRE does not participate in frequency regulation. This study evaluated the role of battery energy storage systems (BESS) in the frequency regulation of a grid with large-scale IRE. The simulations were conducted in the MATLAB-Simulink environment, taking into consideration the operating conditions of the Republic of South Africa (RSA) power system, such as frequency deviation limits. Eskom's (the RSA utility company) policy requires its operators to keep the system frequency between 49.85 Hz and 50.15 Hz 95% of the time. The BESS was integrated into the load frequency control (LFC) model to assist with frequency regulation and maintain the frequency between 49.85 Hz and 50.15 Hz. © 2023 IEEE.

关键词： Battery storage

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Multi-Scale Analysis Combined Operando Elemental/Spectroscopic Measurement Techniques in Oxide-Type All-Solid-State Na Batteries

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Energy & Environmental Materials 2025年第2期8卷 34-43页

作者： Koji Hiraoka Kazuo Yamamoto Takeshi Kobayashi Tetsuo Sakamoto Shiro Seki Graduate School of Engineering Applied Chemistry and Chemical Engineering ProgramKogakuin UniversityHachiojiTokyo 192-0015Japan Nanostructures Research Laboratory Japan Fine Ceramics CenterAtsutaNagoyaAichi 456-8587Japan Energy Transformation Research Laboratory Central Research Institute of Electric Power IndustryYokosukaKanagawa240-0196Japan Graduate School of Engineering Electrical Engineering and Electronics ProgramKogakuin UniversityHachiojiTokyo192-0015Japan

Understanding the charge/discharge mechanism of batteries plays an important role in the development of high-performance systems,but extremely complicated reactions are *** these complex phenomena are also bottlenecks for the establishment of all-sol id-state batteries(ASSB),we conducted multi-scale analysis using combined multi-measurement techniques,to directly observe charge/discharge reactions at hierarchical scales for the oxide-type ASSB using Na as the carrier *** particular,all of measurement techniques are applied to cross-section ASSB in the same cell,to complementarily evaluate the elemental distributions and structural *** Operando scanning electron microscopy-energy-dispersive X-ray spectroscopy,the Na concentration in the electrode layers changes on the micrometer scale under charge/discharge reactions in the first ***,Operando Raman spectroscopy reveal changes in the bonding states at the atomic scale in the active material,including changes in reversible structural *** cycling the ASSB,the elemental distributions are clearly observed along with the particle shapes and can reveal the Na migration mechanism at the nanometer scale,by time-of-flight secondary ion mass ***,this study can provide a fundamental and comprehensive understanding of the charge/discharge mechanism by observing reaction processes at multiple scales.

关键词： Operando oxide-typeall-solid-statebattery Raman SEM-EDS sodium battery TOF-SIMS

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Correntropy-Based Data Selective Adaptive Filtering

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IEEE Transactions on Circuits and Systems I: Regular Papers 2024年第2期71卷 754-766页

作者： Chien, Ying-Ren Wu, Sheng-Teng Tsao, Hen-Wai Diniz, Paulo S.R. Adaptive and Autonomous Communication Laboratory Department of Electrical Engineering National Ilan University Yilan City260007 Taiwan College of Electrical Engineering and Computer Science Graduate Institute of Communication Engineering National Taiwan University Taipei10617 Taiwan Program of Electrical Engineering Department of Electronics and Computer Engineering COPPE/Poli Universidade Federal do Rio de Janeiro Rio de Janeiro68504 Brazil

Data selection can be used in conjunction with adaptive filtering algorithms to avoid unnecessary weight updating and thereby reduce computational overhead. This paper presents a novel correntropy-based data selection method as an alternative to conventional data selection mechanisms based on squared error values. We developed a variable correntropy sensing algorithm to maximize the instantaneous correntropy function for the Gaussian kernel function to mitigate the impact of impulse noise and other forms of noise that can be disregarded in data selection. The proposed data selection mechanism can be implemented with any adaptive filtering algorithm. In simulations, the proposed method (implemented with the least mean squared algorithm) outperformed comparable error-based data selection schemes in terms of hit rate and miss rate, and the resulting weight updating ratio was close to the expected weight updating ratio. © 2023 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.

关键词： Adaptive filters

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Numeracy literacy ability in atomic wave physics spectrum practicum activities among prospective physics teachers 1

Numeracy literacy ability in atomic wave physics spectrum pr...

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1st International Seminar on Physics and Its Application, IsoPA 2024

作者： Sunarti, T. Wasis Jauhariyah, M.N.R. Setyarsih, W. Zainuddin, A. Zakaria, A. Hakim, S.R. Wandhira, R. Physics Education Study Program Universitas Negeri Surabaya Surabaya Indonesia Department of Electrical and Electronics Engineering Universitas Negeri Yogyakarta Yogyakarta Indonesia

This research aims to determine the level of numeracy literacy skills of prospective physics teachers. This research uses descriptive research with a quantitative approach. The subjects of this research were prospective physics teachers who took part in waves courses and electromagnetic wave spectrum practicums in the physics education study program at Surabaya State University in 2 classes, with 23 people in each class. The instruments used are 3 test questions that measure literacy skills (finding information, interpreting, evaluating) and 8 questions that measure numeracy skills, namely, numeracy, reasoning, and application. The research data was analyzed quantitatively and descriptively. The results of the research showed that variations in the level of numeracy literacy skills before the atomic spectrum practicum activity were in the basic category, with an average of 49.5% of students having answered correctly as many as 46 students, then they were given treatment by carrying out EM wave practicum, the numeracy literacy abilities of students after being given the treatment were in the category requiring special intervention, there were 5 people, in the basic category there were 10 people, in the advanced category there were 18 people. In the very advanced category, there were 7 people. Overall, students have quite good abilities in finding information, interpreting information, evaluating information, and understanding information, which is in the advanced category with a percentage of correct answers of 74.12%, 72.98%, 72.70%, and 71, respectively. At the same time, the indicators of applying information and reasoning are still in the basic category at 32.46%. So, it can be concluded that students' numeracy literacy skills are quite good. However, several other treatments are still needed to improve literacy and numeracy skills. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Students

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Quantitative Analysis of Ankle Spasticity Through Electromyography Signal

Quantitative Analysis of Ankle Spasticity Through Electromyo...

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2024 Medical Technologies Congress, TIPTEKNO 2024

作者： Gurluk, Ayse Bilal, Hafiz Muhammad Hocaoglu, Elif Living Robotics Laboratory Graduate School of Health Sciences Physiotherapy and Rehabilitation Program Istanbul Medipol University Istanbul Turkey Living Robotics Laboratory Graduate School of Engineering and Natural Sciences Electrical-Electronics Engineering and Cyber-Systems Program Istanbul Medipol University Istanbul Turkey Living Robotics Laboratory Department of Electrical and Electronics Engineering Istanbul Medipol University Istanbul Turkey

ISBN: (纸本)9798331529819

This study presents a more accurate evaluation method for assessing ankle spasticity compared to conventional goniometric techniques by utilizing measurements obtained from Inertial Measurement Units (IMU) and surface electromyography (sEMG) devices. Integrating IMU and EMG sensors provides substantial benefits for accurately determining the range of motion (ROM) associated with spasticity during targeted movements. In this study, the proposed method provides precise measurement and an objective evaluation of onset time detection of antagonistic muscle co-contraction, and accordingly the ROM of the actuated joint. Moreover, the implementation of cost-effective wearable sensors enables the monitoring of muscle spasticity in clinical environments and can be particularly valuable in regions with limited access to experienced therapists, providing a more efficient approach to tracking spasticity levels. © 2024 IEEE.

关键词： Electromyography

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