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5th International Conference on electrical, Communication and computer engineering, ICECCE 2024

作者： Ritonja, Jožef University of Maribor Faculty of Electrical Engineering and Computer Science Maribor Slovenia

ISBN: (纸本)9798331529437

The introduction of new energy sources, advancements in storage facilities, and the development of power electronics devices have significantly impacted power systems. These innovations, along with complex control strategies, economical operational practices, and cost-efficient equipment construction, have introduced challenges to small-signal stability, particularly affecting local mode oscillations. Currently, there is a notable absence of comprehensive analyses of local oscillations in contemporary synchronous generators. The scope of this investigation is to analyse local oscillations and their underlying causes to mitigate their adverse effects. The primary objective of the paper is the analysis of several dozen generators within Slovenian power system. Initially, the paper outlines mathematical models suited for studying local oscillations. A significant contribution of this paper lies in the formulation of practical guidelines to assist power plant operators in mitigating stability issues. Additionally, the paper estimates eigenvalue boundaries associated with local modes. To validate these findings, experiments were conducted using laboratory-scale synchronous generators to confirm the conclusions derived from numerical analyses. © 2024 IEEE.

关键词： Synchronous generators

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An Efficient Closed-Form Method For Underwater Source Localization With Isogradient Sound Speed Profile 16

An Efficient Closed-Form Method For Underwater Source Locali...

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16th International Conference on Communication Software and Networks, ICCSN 2024

作者： Chen, Guanxu Wang, Gang Ningbo University Faculty of Electrical Engineering and Computer Science Ningbo China

ISBN: (纸本)9798331506322

In this paper, we address the underwater localization problem with isogradient sound speed profile (SSP) using time-of-arrival (TOA) measurements. The sound speed is related to the unknown source depth in the isogradient SSP model, which is highly nonlinear. Owing to this nature of the isogradient SSP model, the maximum likelihood (ML) problem for estimating the source position is non-convex such that local convergence may occur without sufficiently good initialization. To address this difficulty, we first approximate the isogradient SSP model, and then propose a closed-form two-step weighted least squares (TSWLS) method for estimating the source position based on the approximate model. The solution method is accurate since the approximate model takes the source depth into consideration, and can be used to solve the ML problem as an initialization. Moreover, the proposed TSWLS solution is simple and computationally attractive since it is in closed form. Simulation results show that the proposed TSWLS solution is sufficiently accurate and can be used as the initial estimate for solving the non-convex ML problem, such that the mean square error (MSE) of the ML solution can reach the Cramér-Rao lower bound (CRLB). Index Terms-Underwater localization, time-of-arrival, isogradient sound speed profile, two-step weighted least squares. © 2024 IEEE.

关键词： Mean square error

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Speech Quality Assessment and Emotions - Effect on the PESQ Metric 15

Speech Quality Assessment and Emotions - Effect on the PESQ ...

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15th International Conference Elektro, ELEKTRO 2024

作者： Zgank, Andrej Donaj, Gregor Vlaj, Damjan University of Maribor Faculty of Electrical Engineering and Computer Science Maribor Slovenia

ISBN: (纸本)9798350372359

This paper analyzes how emotional speech influ-ences the quality assessment process. The objective metrics for speech quality assessment are usually evaluated with neutral speech recordings, but human interaction frequently involves emotions. Those can modify speech signals' acoustic and phonetic characteristics largely, which are essential from the objective speech quality assessment perspective. The proposed analysis was carried out with the English and Slovenian Interface emotional speech database, which includes two neutral and six emotional speaking styles. Speex codec was used to simulate the degradations, which were then assessed with the lTV - T P.862 PESQ objective metric. The results' analysis showed that in both languages surprise, in English fear, and in Slovenian disgust influenc the speech quality assessment significantly. © 2024 IEEE.

关键词： Quality control

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Relation Between electrical Grid Congestion and Bus Characteristics

Relation Between Electrical Grid Congestion and Bus Characte...

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2024 IEEE PES Innovative Smart Grid Technologies Europe Conference, ISGT EUROPE 2024

作者： Verdaasdonk, Flin Vlasiou, Maria Hoogsteen, Gerwin Hurink, Johann University of Twente Department of Electrical Engineering Mathematics Computer Science Netherlands

ISBN: (纸本)9789531842976

electrical grids are increasingly congested, which causes stability and safety risks. To get more insights in how congestion can be managed, this paper analyses whether bus characteristics exist that have a consistent influence on grid loading. To study this, a metric for quantifying bus influence on grid loading is introduced and applied in two case studies. The first case study investigates if there are characteristics that correlate with congestion consistently, regardless of grid topology. The results from this case study suggest that none of the evaluated characteristics consistently correlate with grid loading. These results imply that topology should be explicitly considered in congestion management. The second case study investigates the variance in the correlation between bus characteristics and influence, within a single topology, over a variety of conditions. The results of the second case study suggest that this correlation is robust to reasonable changes in bus loads. © 2024 IEEE.

关键词： Sensitivity analysis

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Cascaded Shadowed UAV-to-Ground Channels 10

Cascaded Shadowed UAV-to-Ground Channels

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10th IEEE World Forum on Internet of Things, WF-IoT 2024

作者： Polus, Remon D'amours, Claude University of Ottawa School of Electrical Engineering and Computer Science Ottawa Canada

ISBN: (纸本)9798350373011

In this paper, cascaded shadowed uncrewed aerial vehicles (UAVs)-to-ground fading channels are introduced and mathematically characterized. This is done in order to provide a comprehensive statistical analysis by deriving expressions for their probability density function (PDF) and cumulative distribution function (CDF). This lays the groundwork for modeling and analyzing the reliability of wireless communication systems operating over such channels. Utilizing these expressions, key metrics such as the outage probability, average channel capacity, and average bit error probability are derived. The Meijer G function is employed to express these metrics in closed-form expressions. To validate our analysis, Monte-Carlo simulations are conducted, demonstrating the effectiveness and accuracy of our analytical framework. Index Terms-Beyond 5G communications, uncrewed aerial vehicles (UAVs), cascaded channels. © 2024 IEEE.

关键词： Distribution functions

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A Sub-nanosecond Delay Floating-voltage Level Shifter for SiC MOSFETs Gate Driver Application 6

A Sub-nanosecond Delay Floating-voltage Level Shifter for Si...

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6th International Conference on Energy Systems and electrical Power, ICESEP 2024

作者： Wan, Yue Xia, Yinshui Ningbo University Faculty of Electrical Engineering and Computer Science Ningbo China

ISBN: (纸本)9798350353563

In order to meet the requirements for the design of SiC gate driver in terms of speed and dv/dt immunity, a sub-nanosecond delay level shifter based on a high-voltage (HV) digital level shifter circuit is proposed. It can decrease the response time compared with the existing level-shifting circuitry, enabling its application in high-voltage scenarios such as closed-loop drive circuits for silicon carbide. The edge detection circuit and simple pull-up branches are utilized to reduce the transmission delay and power consumption. The circuit is simulated at a frequency of 10MHz in a 018um BCD process with Virtuoso, and the results demonstrate that the average transmission delay is about 380ps and the charging response time of the slow path is reduced to 3.3ns. © 2024 IEEE.

关键词： Delay circuits

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Automatic Waterfowl and Habitat Detection using Drone Imagery and Deep Learning

Automatic Waterfowl and Habitat Detection using Drone Imager...

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2024 IEEE International Conference on Consumer Electronics, ICCE 2024

作者： Zhao, Andrew Fratila, Andrea Zhang, Yang Zhai, Zhenduo Liu, Zhiguang Shang, Yi University of Illinois Computer Science Department United States University of Missouri Department of Electrical Engineering and Computer Science United States

ISBN: (纸本)9798350324136

The integration of drone technology and Artificial Intelligence (AI) has opened up new possibilities for wildlife conservation and habitat monitoring. In this paper, we present a new system for efficiently and accurately analyzing waterfowl populations and classifying their habitats over large natural areas using drone imagery and deep learning (DL). Given a sequence of drone images captured by a drone along a flight path, the system utilizes customized deep learning models for waterfowl detection and counting, Meta's SAM for image segmentation and customized deep learning models for segment classification, and ChatGPT to generate text-based survey reports. Several image overlap detection methods were developed and compared with. Our experimental results show accurate waterfowl and habitat detection results and improvement over previous work, providing efficient and accurate data analysis for wildlife conservation efforts. © 2024 IEEE.

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Detection of Novel Cyberattacks Using Multi-Binary Classifiers 34

Detection of Novel Cyberattacks Using Multi-Binary Classifie...

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34th Annual International Conference on Collaborative Advances in Software and Computing, CASCON 2024

作者： Gaudreault, Jean-Gabriel Branco, Paula School of Electrical Engineering and Computer Science University of Ottawa OttawaON Canada

ISBN: (纸本)9798331504830

Intrusion Detection Systems (IDSs) are an essential part of modern-day cybersecurity defenses, enabling the detection of potential malicious activities within network and computer systems. Although multiple techniques have been employed to implement IDSs, supervised machine learning approaches have historically proven particularly effective due to their capacity to leverage large amounts of data and maintain a generally low false alarm rate. However, a significant limitation of these approaches is their inability to detect novel threats, such as zero-day attacks, that were not present in the training data. In this study, we introduce a novel supervised approach based on binary classifiers that can detect these previously unseen attacks while also maintaining a high detection rate and low false alarm rate through the use of a filtering mechanism. We empirically demonstrate the effectiveness of our proposed technique on multiple intrusion detection datasets, showing that it is able to detect unseen attacks and perform multiclass classification while outperforming traditional supervised methods. © 2024 IEEE.

关键词： Network intrusion

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A Custom Generative AI Chatbot as a Course Resource

A Custom Generative AI Chatbot as a Course Resource

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2024 ASEE Annual Conference and Exposition

作者： Ai, Yutong Baveja, Maya Girdhar, Akanksha O'Dell, Melina Deorio, Andrew Department of Electrical Engineering and Computer Science University of Michigan United States

Generative AI (GenAI) chatbots have taken the world by storm with their ability to summarize information and produce complex natural language *** the same time, the demand for computer science education has grown *** developed a custom GenAI chatbot and released it to over 700 students to assist with a course programming *** tool was trained on the project specification, lecture content, lab materials, and past course forum posts relevant to the *** course is a high-enrollment upper-level computer science elective at a large public research *** project is a simple distributed system using processes, threads, and *** goal of the tool was to provide an additional course resource that supplies valuable information to students comparable to advice they would receive from course *** measured the effectiveness of our tool with a student survey, evaluation by course instructors, and comparison with a state-of-the-art general purpose *** overall survey data indicated high rates of correctness and helpfulness in the Bot *** found that hallucination was not common, and most incorrect responses were identifiable by *** Bot also performed better than general purpose bots for project-specific *** experience can provide insights for faculty using GenAI to assist students in their courses.A customized chatbot can be helpful to students and augment traditional course resources. © American Society for engineering Education, 2024.

关键词： Students

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Time-delay Correction Control Strategy for HVDC Frequency Regulation Services

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2027-2037页

作者： Yuqing Dong Kaiqi Sun Jinning Wang Shunliang Wang He Huang Tianqi Liu Yilu Liu School of Electrical Engineering Shandong UniversityJinan 250061China School of Electrical Engineering Shandong UniversityJinan 250061China. Department of Electrical Engineering and Computer Science University of TennesseeKnoxville 37996USA.

With the advancements in voltage source converter(VSC)technology,VSC based high voltage direct current(VSCHVDC)systems provide system operators with a prospective approach to enhance system operating stability and *** addition to long-distance transmission,the VSC-HVDC system can also provide multiple ancillary services,such as frequency regulation,due to its power ***,if a time delay exists in the control signal,the VSC-HVDC system may bring destabilizing influences to the system,which will decrease the system resilience under the *** order to reduce control deviation caused by time delay,in this paper,a small signal model is first conducted to analyze the impact of time delay on system *** a time-delay correction control strategy for HVDC frequency regulation control is developed to reduce the influence of the time *** control performance of the proposed time-delay correction control is verified both in the established small signal model and the runtime simulation in a modified IEEE 39 bus *** results indicate that the proposed time-delay correction control strategy shows significant improvement in system stability.

关键词： Frequency regulation control HVDC small signal analysis time delay time-delay correction control strategy

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