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IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Ana Marín-Hurtado Andrés Escobar-Mejía Alfonso Alzate-Gómez Electrical Engineering Graduate and Undergraduate Program Universidad Tecnológica de Pereira Pereira Colombia

ISBN: (数字)9798350361001

ISBN: (纸本)9798350361018

Inertia is an important property in power systems to counteract frequency deviations due to power fluctuations. However, the proliferation of Renewable Energy Sources (RES) in the grid has decreased system inertia because they do not have or have a small rotating mass. This produces stability challenges as increasing the frequency deviation and rate of change of frequency, which can produce power electronics converter malfunctions, disconnection of large renewable generation, black-out, and load shedding. The Virtual Synchronous Machine (VSM) has emerged as a promising solution for controlling converters to integrate RES, emulating the inertial response of conventional synchronous generators. Nevertheless, designing VSM parameters presents a significant challenge, especially in scenarios involving unbalanced grid conditions. This paper proposes an adaptive inertia control scheme using an Orthogonal Projection Algorithm (VSM-POA) to calculate the inertia of VSM to improve the stability of an unbalanced power system. This approach determines the inertia based on an identification algorithm that analyzes the frequency deviations in the presence of torque changes of the VSM to compute the inertia. To show the performance of the VSM-POA approach, time-domain simulations will be carried out in a four-wire system with an unbalanced current considering load variations. Moreover, the approach will be evaluated in a Hardware-In-the-Loop (HIL) structure. Results indicate that the VSM - POA controller exhibits a lower Rate of Change of Frequency (ROCOF), reduced max-imum frequency deviation, and decreased frequency oscillations compared with VSM with constant inertia.

关键词： Renewable energy sources Adaptive systems Torque Power system stability Frequency conversion Stability analysis Power electronics

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Performance of MIMO Visible Light Communication Under Consideration of Recommended Illumination Levels

Performance of MIMO Visible Light Communication Under Consid...

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Optics and Photonics Conference (SBFoton IOPC), SBFoton International

作者： David Esteban Farfán-Guillén Alexandre De Almeida Prado Pohl Graduate Program in Electrical and Computer Engineering (CPGEI) Federal University Technology-Parana Curitiba Brazil

This work compares illumination and communication performance of 2 × 2, 3 × 2 and 4 × 2 MIMO-OFDM VLC links. Results show that not every configuration complies with the recommended illumination levels (... 详细信息

ISBN: (数字)9798350388176

ISBN: (纸本)9798350388183

关键词： Spatial diversity Lighting Optics MIMO Robustness Photodetectors Indoor environment Antennas Visible light communication Photonics

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Strain Sensitivity Comparison in Multi- and Single-Mode Fibers for Distributed Sensors Based on Rayleigh Scattering

Strain Sensitivity Comparison in Multi- and Single-Mode Fibe...

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Optical Fiber Sensors (LAWOFS), Latin American Workshop on

作者： Leandro Macedo Anselmo Frizera Arnaldo Leal-Junior Graduate Program in Electrical Engineering Federal University of Espírito Santo Vitória Brazil

ISBN: (数字)9786589532026

ISBN: (纸本)9798350362725

This work presents a comparison between multi- and single-mode fibers concerning the strain sensitivity based on the Rayleigh backscattering for distributed sensing applications. The experimental setup is composed of two 120 cm optical fibers (one MMF and one SMF). These fibers are attached to linear translation stages where the strain transmitted to the optical fiber is controlled by the stage displacement. The optical fibers are divided into three sections: Section 1 is placed between 90 and 120 cm, Section 2 is located between 50 and 80 cm, and Section 3 is situated between 10 and 40 cm. In each section, the stage displacement has varied from $10 \ \mu \mathrm{m}$ to $50 \ \mu \mathrm{m}$ in steps of $10 \ \mu \mathrm{m}$ . For the SMF, the obtained strain sensitivity was $14.94\ \text{GHz}/\mu\varepsilon 14.62\ \text{GHz}/\mu\varepsilon$ , and $14.49\ \text{GHz}/\mu\varepsilon$ , for sections 1, 2, and 3, respectively. For the MMF, the obtained strain sensitivity was $14.65\ \text{GHz}/\mu\varepsilon, 15.51\ \text{GHz}/\mu\varepsilon$ , and $19.76\ \text{GHz}/\mu\varepsilon$ , for sections 1, 2, and 3, respectively. Despite the intrinsic difference in the Rayleigh backscattering phenomenon in MMF and SMF, for the analyzed length range the strain sensitivity for both fiber types was in the same order. Finally, both MMF and SMF could be used as a strain distributed sensor.

关键词： Optical fibers Optical fiber sensors Sensitivity Rayleigh scattering Conferences Sensors Strain

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A Risk Assessment Model for Water Reuse: Risks Related to Agricultural Irrigation in Brazil

SSRN

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SSRN 2024年

作者： Vidotti, Débora Beatriz Maia Soares, Paulo Fernando Lukiantchuki, Juliana Azoia Benatti, Cláudia Telles Graduate Program in Urban Engineering State University of Maringá Maringa87020-900 Brazil Graduate Program in Civil Engineering State University of Maringá Maringa87020-900 Brazil Civil Engineering Department State University of Maringá Maringa87020-900 Brazil

Urbanization and industrialization are increasing extreme weather events, causing water quantity and quality reduction. Global water scarcity impacts 32.5% of the urban population and is growing. Brazil has also witnessed water scarcity, notably in the southeast (2014-2015) and south (2019-2020), with reservoirs dropping below 20% capacity. Water reuse is vital for mitigating scarcity, though it presents risks due to contaminants. Risk analysis studies are crucial for evaluating contamination sources, pathways, and exposure scenarios in water reuse practices. Various methodologies, including quantitative, semi-quantitative, and qualitative analyses, can be employed. Given the uncertainty and diverse factors, qualitative methods are recommended for non-potable water reuse risk analysis. This work presents a qualitative risk analysis methodology, focusing on agricultural reuse. It assesses factors affecting human health and the environment, considering exposure scenarios, receptors characteristics, and reuse water sources. By reviewing literature, the probability of occurrence and the magnitude of impact of the risk factors were identified, resulting in an overall risk value for comparing agricultural irrigation alternatives. This adaptable risk analysis model is mainly related to water treatment methods, prompting the proposal of risk control measures. © 2024, The Authors. All rights reserved.

关键词： Risk analysis

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Evaluating QoE in Cloud-Based Virtual Reality Systems: A Pilot Study

Evaluating QoE in Cloud-Based Virtual Reality Systems: A Pil...

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International Workshop on Secure Internet of Things (SIoT)

作者： Mariana Godoy Fabiana Machado Igor Vieira Ricardo Mello Anselmo Frizera Graduate Program in Electrical Engineering Federal University of Espírito Santo Vitória Brazil

ISBN: (数字)9798331507466

ISBN: (纸本)9798331507473

The importance of proper human-machine interaction has become increasingly recognized in several sectors, such as industry, health, and education. Extended Reality (XR) technologies are currently being explored to generate innovative interaction techniques and to enhance immersion during HMI. However, solutions involving XR require high computational power, which may affect cost efficiency for large-scale deployment. Cloud computing may be a viable solution for generating XR content - which can be streamed to XR devices - and to enable its use within places were multiple people are connected to the XR the same time (e.g., factory floors were workers use headmounted displays to visualize and interact with the machinery). Nevertheless, the remote generation of XR content faces problems such as the effect of latency upon the system. This article presents a pilot study on the use of cloud-based VR systems to analyze the effect of latency on user-perceived quality of experience (QoE).

关键词： Cloud computing Visualization Cybersickness Statistical analysis Games Quality of service User experience Social Internet of Things Quality of experience Testing

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Coprecipitation Strategy for Halide-Based Solid-State Electrolytes and Atmospheric-Dependent In Situ Analysis

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ACS Applied Materials and Interfaces 2024年第21期16卷 27394-27399页

作者： Bilo, Josanelle Angela V. Chang, Chung-Kai Chuang, Yu-Chun Fang, Mu-Huai Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsinghua University Hsinchu30013 Taiwan Department of Science and Technology Philippine Textile Research Institute Taguig City1631 Philippines National Synchrotron Radiation Research Center Hsinchu300 Taiwan

In the continuous pursuit of an energy-efficient alternative to the energy-intensive mechanochemical process, we developed a coprecipitation strategy for synthesizing halide-based solid-state electrolytes that warrant both structural control and commercial scalability. In this study, we propose a new coprecipitation approach to synthesized Li3InCl6, exhibiting both structural and electrochemical performance stability, with a high ionic conductivity of 1.42 × 10-3 S cm-1, comparable to that of traditionally prepared counterparts. Through the in situ synchrotron X-ray diffraction technique, we unveil the stability mechanisms and rapid chemical reactions of Li3InCl6 under dry Ar, dry O2, and high-humidity atmosphere, which were not previously reported. Furthermore, the fast reversibility capability of moisture-exposed Li3InCl6 was tracked under vacuum, revealing the optimal recovery conditions at low temperatures (150-200 °C). This work addresses the critical challenges in structural engineering and sustainable mass production and provides insights into chemical reactions under real-world conditions. © 2024 The Authors. Published by American Chemical Society.

关键词： Coprecipitation

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A Developed PLL Control Technique for Distorted and Unbalanced Grid Voltages with a Three-Level NPC Converter-Based Off-Board Battery Charger

A Developed PLL Control Technique for Distorted and Unbalanc...

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2022 International Electrical engineering Congress, iEECON 2022

作者： Thanakam, Thidarat Kumsuwan, Yuttana Chiang Mai University Graduate Program in Electrical Engineering Department of Electrical Engineering Faculty of Engineering Chiang Mai Thailand Chiang Mai University Faculty of Engineering Department of Electrical Engineering Chiang Mai Thailand

ISBN: (纸本)9781665402064

As electric vehicle technologies advance, the number of off-board battery charger stations grows. Because they can provide a high-power level that is suitable for fast charging. The main factor of high-power transferring is power converters that should serve the grid power quality, including the reactive power, the power factor, and the harmonic distortion. In this paper, the development of the control algorithm for the three-phase three-level neutral point clamped converter-based off-board battery charger to support the utility grid when the three-phase grid voltage distortion or unbalance occurs is presented. By applying the standard phase-locked loop controller into the conventional control algorithm, it is possible to obtain more sinusoidal and balanced grid currents along with distorted or unbalanced grid voltages to conserve the grid power quality. The system operations, along with the comparison of the conventional control algorithm and the proposed algorithm, are provided in the simulation results. © 2022 IEEE.

关键词： Charging (batteries)

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A High-Performance Grid-Tied Three-Level T-Type Converter for Off-Board Battery Chargers under AC-Side Voltage Distortions and Unbalances 19

A High-Performance Grid-Tied Three-Level T-Type Converter fo...

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19th International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2022

ISBN: (纸本)9781665485845

The conversions are a key factor in the battery charging of electric vehicles. The off-board battery chargers, which are composed of converters and controller units, are needed to fast charge by transferring high-power. The converters should serve applications even with unusual grid systems where non-sinusoidal grid currents occur. This paper describes a high-performance, three-level T-type converter for off-board battery chargers. It can operate under conditions of grid voltage distortions and grid voltage unbalances. The proposed control algorithm provides the three-phase sinusoidal currents to prevent their effect on the grid system and the equipment, which is an improvement from the conventional control algorithm. The constant current and constant voltage modes are applied for charging applications. Moreover, the power factor correction can be obtained. The simulation results are provided to investigate the performance of the off-board battery charger based on the three-level T-type converter. © 2022 IEEE.

关键词： Charging (batteries)

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EfficientSpeech: An On-Device Text to Speech Model

EfficientSpeech: An On-Device Text to Speech Model

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

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

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.

关键词： Performance evaluation Degradation Computational modeling Signal processing Transformers Real-time systems Computational efficiency

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Hotel Information System Management Audit Using COBIT 2019 - APO12 2

Hotel Information System Management Audit Using COBIT 2019 -...

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2nd International Conference for Innovation in Technology, INOCON 2023

作者： Utamajaya, Joy Nashar Supangat, Suhono Harso Gaol, Ford Lumban Ranti, Benny BINUS University BINUS Graduate Program School of Information System Jakarta Indonesia Bandung Institute of Technology School of Electrical Engineering and Informatic Bandung Indonesia Bina Nusantara University Computer Science Department BINUS Graduate Program Computer Science Jakarta Indonesia University of Indonesia Computer Science Department Faculty of Computer Science Depok Indonesia

ISBN: (纸本)9798350320923

In general, public or private organizations or companies have used information-based technology as a support to improve business performance to be more effective and efficient in order to achieve a company's business goals. Given the large contribution of information technology in the application of hotel applications as a supporting information system, it is a vital system that must avoid risks that can hinder and cause harm to the hotel management business processes. Therefore, it is necessary to carry out risk management using the COBIT 5 framework to manage possible risks that may occur based on the APO12 (Manage Risk) domain. From the evaluation results of the data obtained through observation and interviews as well as the calculation of the results of the questionnaire based on 6 APO12 subdomains, the results of the risk management level capability assessment in hotel applications are still at level 3 or have reached the level of established process with the target to be achieved at level 4 resulting in a gap of 1 level. Based on the results obtained, it is necessary to propose recommendations that can be used by hotels in improving the application of information technology risk management so that in the future it can achieve the expected target level so that the APO12 level of capability can increase and become more optimal. © 2023 IEEE.

关键词： Risk management

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