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Lifetime Extension for Solid-State Circuit Breakers in Motor Control center Applications

Lifetime Extension for Solid-State Circuit Breakers in Motor...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Jiale Zhou Tiefu Zhao Yao Wang Dept. of Electrical and Computer Engineering Energy Production and Infrastructure Center (EPIC) University of North Carolina at Charlotte Charlotte NC USA School of Electrical Engineering Hebei University of Technology Tianjin China

Solid-state circuit breakers (SSCBs) are becoming increasingly popular building blocks of direct current (DC) power systems due to their characteristics of fast interruption, arc-less operation, and no moving parts in recent years. However, the application of SSCBs in alternating current (AC) systems has been limited, primarily due to competition from traditional electromechanical circuit breakers commonly used for AC protection. This paper presents a comprehensive approach to integrate multiple functionalities, including soft start, overload relay, circuit breaker, and contactor, into a single three-phase bidirectional SSCB for motor control center (MCC) applications. This integration enhances system integration, intelligence, and significantly reduces the bulk compared to conventional MCC. In this paper, the lifetime performance of the SSCB is investigated, particularly its use as a contactor, and a turn-off solution is proposed to increase the lifetime and reliability of the SSCB without the participation of any voltage overshoot suppression or zero-crossing current detection devices. Furthermore, the proposed turn-off strategy is analyzed, and the design considerations for snubber and metal oxide varistor (MOV) selection are discussed in relation to the contactor function of the SSCB. Finally, simulation and experimental results are provided to verify the effectiveness of the contactor function and the proposed turn-off scheme.

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SiC Bidirectional Solid-State Circuit Breaker with Soft-Start Function for Motor Control center

SiC Bidirectional Solid-State Circuit Breaker with Soft-Star...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Jiale Zhou Haichen Liu Tiefu Zhao Xiwen Xu Yao Wang Dept. of Electrical and Computer Engineering Energy Production and Infrastructure Center (EPIC) University of North Carolina at Charlotte Charlotte NC USA School of Electrical Engineering Hebei University of Technology Tianjin China

Solid-State Circuit Breaker (SSCB) has been identified as a potential game-changing technology for DC distribution. However, fewer SSCB research and applications have been reported in AC due to the direct competition with the conventional electromechanical circuit breaker, which has a proven record as AC circuit protection device. This paper investigates the current protection and soft start functions of a three-phase SSCB in the motor control center (MCC). The proposed SSCB integrates application-specific protection functions of soft starter, magnetic contactor, circuit breaker, and thermal relay. The paper designs and implements a three-phase SSCB with a rated voltage of 380VAC and a rated current of 63A. Three key design considerations, including semiconductor device selection, metal oxide varistor (MOV) and snubber selection, and heat sink selection are introduced. The current fault protection of the SSCB was tested and verified at 200A by a pulse test platform with a microsecond-level fault current clearing time. Finally, the soft start function was analyzed and realized without zero current detection. Both simulation and experimental results validate the soft-starting function with significant reduction of motor inrush current. By combining the conventional contactor, circuit breaker, and soft starter functions into one, SSCB can offer competitive advantages in MCC applications.

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POCS-based Image Compression: An Empirical Examination

POCS-based Image Compression: An Empirical Examination

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International Conference on Green technology and Sustainable Development (GTSD)

作者： Truong-Dong Do Le-Anh Tran Thanh-Dat Nguyen Nghe-Nhan Truong Dong-Chul Park My-Ha Le Dept. of Aerospace Systems Engineering Sejong University Seoul South Korea Dept. of Electronics Engineering Myongji University Yongin South Korea Dept. of Research and Development OCST Co. Ltd. Seoul South Korea Dept. of Computer Science & Engineering Sejong University Seoul South Korea Dept. of Electrical & Electronics Engineering HCMC University of Technology & Education Ho Chi Minh City Vietnam

ISBN: (数字)9798350386073

ISBN: (纸本)9798350386080

This paper investigates the applicability of the Pro-jection onto Convex Set (POCS)-based clustering algorithm to image compression tasks. The POCS-based clustering approach treats all data points in a given dataset as non-intersecting convex sets and performs POCS-based parallel projections from each cluster prototype onto corresponding member data points to minimize an objective function and update cluster prototypes. The POCS-based clustering algorithm has been proven to be able to yield promising results against other prevailing clustering approaches in terms of convergence time and clustering error on general clustering tasks. In this study, a comparison of various clustering schemes for image compression applications has been conducted. The evaluations and analyses on various standard test images verify that the POCS-based clustering algorithm can perform competitively against other conventional clustering methods in image compression problems.

关键词： Image coding Clustering methods Clustering algorithms Prototypes Linear programming Sustainable development Standards

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Energy-Aware Trajectory Design for UAV-mounted Full-duplex Relays

Energy-Aware Trajectory Design for UAV-mounted Full-duplex R...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Dimitrios Tyrovolas Nikos Mitsiou Thomas Boufikos Sotiris Tegos Prodromos-Vasileios Mekikis Panagiotis Diamantoulakis Sotiris Ioannidis Christos Liaskos George Karagiannidis Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Dept. of Electrical and Computer Engineering Technical University of Crete Chania Greece Hilti Corporation Feldkircher Strasse 100 Schaan Liechtenstein Computer Science Engineering Department University of Ioannina Ioannina Greece Artificial Intelligence & Cyber Systems Research Center Lebanese American University (LAU) Lebanon

ISBN: (数字)9798350362244

ISBN: (纸本)9798350362251

Unmanned aerial vehicles (UAVs) equipped with full-duplex relays (FDRs) are pivotal in overcoming connectivity challenges by dynamically establishing effective communication channels. However, despite their potential in network performance via trajectory optimization, integrating energy consumption models for UAV-mounted FDRs remains unexplored, crucial for trajectory design adhering to existing energy constraints. To this end, we introduce an energy-aware trajectory optimization framework to maximize network performance and user fairness within the UAV’s energy constraints. Specifically, we present a detailed energy consumption model describing the operational needs of UAV-mounted FDRs and formulate a joint time-division multiple access (TDMA) user scheduling-UAV trajectory optimization problem considering the power dynamics of UAV-mounted FDRs. Finally, our simulation results highlight the role of energy awareness in achieving optimal trajectory and scheduling, contributing to UAV-mounted FDRs’ performance in future networks.

关键词： Energy consumption Time division multiple access Trajectory planning Simulation Full-duplex system Network architecture Autonomous aerial vehicles Vehicle dynamics Relays Trajectory optimization

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Team Precoding Towards Scalable Cell-free Massive MIMO Networks 55

Team Precoding Towards Scalable Cell-free Massive MIMO Netwo...

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55th Asilomar Conference on Signals, systems and computers, ACSSC 2021

作者： Miretti, Lorenzo Bjornson, Emil Gesbert, David EURECOM Communication Systems Dept. Sophia Antipolis France KTH Royal Institute of Technology Dept. of Computer Science Stockholm Sweden Dept. of Electrical Engineering Linköping University Linköping Sweden

ISBN: (纸本)9781665458283

In a recent work, we studied a novel precoding design for cell-free networks called team minimum mean-square error (TMMSE) precoding, which rigorously generalizes centralized MMSE precoding to distributed operations based on transmitter-specific channel state information (CSI). Despite its flexibility in handling different cooperation regimes at the CSI sharing level, TMMSE precoding assumes network-wide sharing of the data bearing signals, and hence it is inherently not scalable. In this work, inspired by recent advances on scalable cell-free architectures based on user-centric network clustering techniques, we address this issue by proposing a novel version of the TMMSE precoding design covering partial message sharing. The obtained framework is then successfully applied to derive a variety of novel, optimal, and efficient precoding schemes for a user-centric cell-free network deployed using multiple radio stripes. Numerical simulations of a typical industrial internet-of-things scenario corroborate the gains of TMMSE precoding over competing schemes in terms of spectral efficiency under different power constraints. Although presented in the context of downlink precoding, the results of this paper may be applied also on the uplink. © 2021 IEEE.

关键词： Mean square error

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Low-Latency and Energy-Efficient Task Scheduling for End-Edge-Cloud Collaborative Computing

Low-Latency and Energy-Efficient Task Scheduling for End-Edg...

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IEEE International Conference on systems, Man and Cybernetics

作者： Jingyao Li Haitao Yuan Yaofei Ma Jing Bi Jinhong Yang Jia Zhang School of Automation Science and Electrical Engineering Beihang University Beijing China College of Computer Beijing University of Technology Beijing China CSSC Systems Engineering Research Institute Beijing China Dept. of Computer Science Southern Methodist University Dallas TX USA

ISBN: (数字)9781665410205

ISBN: (纸本)9781665410212

Mobile edge computing (MEC) is a new paradigm that improves the quality of service compared with traditional cloud computing. In MEC, computational tasks are submitted by numerous end users and are partially offloaded to edge servers or a central cloud. However, the characteristics of tasks are different from each other, and the limited resources of computational nodes are also heterogeneous, which brings great challenges to computation offloading and resource allocation for MEC. This work establishes an end-edge-cloud collaborative computing network, which consists of end devices, edge servers, and a central cloud. Task execution location and CPU running frequency determine the execution time and energy consumption to finish the tasks. Considering the aforementioned factors, a multi-objective constrained optimization problem is formulated. To solve the problem, an improved Non-dominated Sorting Genetic Algorithm II (NSGA-II) with self-adaptive crossover and mutation rates is proposed, which is called Improved NSGA-II with _Self-adaptive Crossover and Mutation (INSCM). The total execution time and energy consumption can be jointly minimized with our proposed INSCM. Numerous experiments are carried out to test the performance of INSCM. Simulation results show that INSCM effectively improves the performance of NSGA-II and surpasses random offloading and NSGA-III, which shows practical use in real-life scenarios.

关键词： Energy consumption Cloud computing Time-frequency analysis Multi-access edge computing Simulation Collaboration Servers Optimization Sorting Genetic algorithms

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Advanced Visual Interfaces and Interactions in Cultural Heritage (AVICH 2024) 24

Advanced Visual Interfaces and Interactions in Cultural Heri...

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Proceedings of the 2024 International Conference on Advanced Visual Interfaces

作者： Tsvi Kuflik Berardina Nadja De Carolis Cristina Gena Antonio Origlia Julia Sheidin Information Systems The University of Haifa Israel Department of Computer Science dipartimento di informatica universita' di bari Italy Computer Science Department of Computer Science University of Torino Italy Dept. of Electrical Engineering and Information Technology URBAN/ECO Research Center ?Federico II? University Naples Italy Italy Information Systems Braude College Israel

ISBN: (纸本)9798400717642

Cultural Heritage (CH) is a challenging domain of application for novel Information and Communication Technologies (ICT), where visualization plays a major role in enhancing the visitors’ experience, whether onsite or online. technology-supported natural human-computer interaction is a key factor in enabling access, both on-site and online, to CH assets. Recent advances in ICT enhance visitors’ access to online collections as well as their CH experience onsite, bringing even wider audiences than those who visit the physical museums. The range of visualization devices – from tiny smartwatch screens, through large situated public displays, to the latest generation of immersive Head-Mounted Displays – together with the increasing availability of real-time 3D rendering technologies for online and mobile devices and, recently, Internet of Things (IoT) approaches, Social Robotics, requires exploring how they can be applied successfully in CH. Following the successful workshops at AVI 2016, AVI 2018, AVI 2020, AVI 2022 and AVI 2024 and a large number of recent events and projects focusing on CH, the goal of the workshop is to bring together researchers and practitioners interested in presenting and discussing the potential of state of the art advanced visual interfaces in enhancing our daily cultural heritage experience. This year the workshop theme will be: AVI for accessibility in CH.

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Improved Backward Scenario Reduction Method for Generation Planning Considering Extreme Scenarios 7

Improved Backward Scenario Reduction Method for Generation P...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Xie, Yigong Huo, Ziyu Wu, Chen Yao, Wenfeng Wang, Jiayang Qiao, Ying Power Dispatch Control Center Yunnan Power Grid Guangzhou China Tsinghua University State Key Lab of Power Systems Dept. of Electrical Engineering Beijing China Planning and Construction Research Center Yunnan Power Grid Kunming China China Southern Power Grid Research Institute State Key Laboratory of Current Transmission Technology Guangzhou China

ISBN: (纸本)9798350345094

Renewable energy sources exhibit significant variability and uncertainty, showing numerous distinct scenarios. In the context of generation planning, it's imperative to employ scenario reduction techniques to select representative scenarios that capture the characteristics of renewable energy outputs. However, traditional scenario reduction methods often fail to adequately preserve the extreme output scenarios of these renewables. This paper improves the simultaneous backward reduction method (SBR), enhancing its capability to effectively capture the extreme output scenarios of renewable sources. As a result, the generation planning becomes more economically viable and more reliable. The efficacy of the improved SBR method is demonstrated using data from the Qinhuangdao region in China. © 2023 IEEE.

关键词： Renewable energy

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Maskless Lithography for High-Density Package Redistribution Layers

Maskless Lithography for High-Density Package Redistribution...

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Electronic Components and technology Conference (ECTC)

作者： Prahalad Murali Pratik Nimbalkar Mohanalingam Kathaperumal Mark D. Losego Rao Tummala Madhavan Swaminathan 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA 3D Systems Packaging Research Center & Dept. of Electrical Engineering Pennsylvania State University

Heterogeneous integration of chiplets requires high-density fine line/space (L/S) interconnections to enable system scaling. However, as Moore's law for transistors slows down, the dies are disaggregated based on their specific functions thereby increasing the package sizes to accommodate various dies of different functionalities. To enable a high-density redistribution layer (RDL) in the package, this paper studies the fine-line patterning capability of maskless aligner systems. The paper evaluates the smallest achievable feature size on four different thicknesses namely 5 $\mu \mathrm{m}, 7 \mu \mathrm{m}, 25 \mu \mathrm{m}$ and 80 $\mu \mathrm{m}$ of dry film photoresists (PRs). This work also investigates the effect of dose and defocus on photoresists. Two of the photoresists (5 μm and 80 $\mu \mathrm{m})$ are positive tone and the other 2 are negative tone. The finest L/S obtained was 1.5μm with the positive tone 5 $\mu \mathrm{m}$ dry film photoresist, 3 $\mu \mathrm{m}$ using the 7 $\mu \mathrm{m}$ negative tone and 20 μm using the 80 μm positive tone resist. This paper also investigates the throughput of the maskless aligners based on the dose, exposure area, and pattern density.

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Development of Pole-Changing Generator for Small Wind Power Generation

Development of Pole-Changing Generator for Small Wind Power ...

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International Conference on Renewable Energy Research and Applications (ICRERA)

作者： Tadashi Hosoe Takuya Goto Sena Yamashita Omi Muto Kazuto Yukita Keiichi Hirose dept. of Eco-Electric Power Research Center Aichi Institute of Technology Toyota-city Aichi Japan dept. of Electrical and Electronics Engineering Aichi Institute of Technology Toyota-city Aichi Japan dept. of Smart Community and Energy Systems New Energy and Industrial Technology Development Organization Kawasaki-city Kanagawa Japan

ISBN: (数字)9798350375589

ISBN: (纸本)9798350375596

This report describes the development of a generator for small wind power generation. This generator has a wide power band. Therefore, it can be effectively used as a small wind power generator. The output voltage, output current, and torque of the generator can be changed by switching the internal coil connections. To confirm these characteristics, tests were conducted using an induction machine and a wind turbine. As a result, it was confirmed that the developed generator can keep up with the maximum power of a small wind turbine. Small wind power generation using the proposed generator was proposed as one method to promote the use of renewable energy.

关键词： Coils Renewable energy sources Torque Induction motors Voltage measurement Prototypes Switches Wind power generation Generators Wind turbines

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