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A decentralized power injection-based approach for voltage imbalance mitigation in three-phase distribution networks

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Scientific Reports 2025年第1期15卷 1-21页

作者： Tsobze, Saatong Kenfack Mbasso, Wulfran Fendzi Harrison, Ambe Khishe, Mohammad Dagal, Idriss Jangir, Pradeep Smerat, Aseel Al-Gahtani, Saad F. Elbarbary, Z.M.S. Unité de Recherche d’Automatique et d’Informatique Appliquée I.U.T. Fotso Victor University of Dschang P.O. Box 134 Bandjoun Cameroon Technology and Applied Sciences Laboratory U.I.T. of Douala University of Douala P.O. Box 8689 Douala Cameroon Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai 602 105 India Department of Electrical and Electronics Engineering College of Technology (COT) University of Buea P.O. Box Buea 63 Buea Cameroon Department of Electrical Engineering Imam Khomeini Naval Science University of Nowshahr Nowshahr Iran Beykent University Istanbul Turkey University Centre for Research and Development Chandigarh University Gharuan Mohali 140413 India Innovation Center for Artificial Intelligence Applications Yuan Ze University Taoyuan 320315 Taiwan Department of Electrical and Electronics Engineering J.J. College of Engineering and Technology Tamilnadu Tiruchirappalli India Applied Science Research Center Applied Science Private University Amman 11937 Jordan Faculty of Educational Sciences Al-Ahliyya Amman University Amman 19328 Jordan Centre for Research & Outcome Chitkara University Institute of Engineering and Technology Chitkara University Punjab Rajpura 1404010 India Computer Technologies Engineering Mazaya University College Nasiriyah Iraq Electrical Engineering Department Faculty of Engineering King Khalid University Abha Saudi Arabia Department of Electrical Engineering College of Engineering King Khalid University P.O. Box 394 KSA Abha 61421 Saudi Arabia Center for Engineering and Technology Innovations King Khalid University Abha 61421 Saudi Arabia

This voltage imbalance in four-wire, three-phase distribution networks gives rise to negative-sequence and zero-sequence voltage components which increases the total apparent power received from the network. This also increases the energy losses from the network. Traditional methods employed for load compensation provide partial fixes at the local area without any form of system-wide solution. This work presents a new decentralized control strategy for the inverter of a photovoltaic-based three-phase power source (DPS) aimed at instantaneously correcting phase voltage imbalances. The method does not require load current measurement because it depends entirely on real-time voltage measurements at the point of common coupling (PCC). The capability to mitigate the unbalance depends on the available power of the DPS. To test how effective the proposed method is, simulations have been conducted using MATLAB/SIMULINK on a distribution network with a four-leg inverter connected to a line with cascading single and three-phase loads, where a four-leg inverter enables independent phase control and mitigation of neutral current disturbances. The results show that this control enables the comparison of balancing for three-phase powers with a 96.4% improvement. The phase-to-phase voltage deviation was also reduced by around 8 V (3.6% of nominal voltage). Furthermore, the total harmonic distortion (THD) of the output current from the inverter did not rise about 3.75%, hence improving the power quality. Its real-time applicability in decentralized renewable energy integration is possible due to the method’s effectiveness in reducing voltage imbalances even when network conditions are extremely distorted. © The Author(s) 2025.

关键词： Decentralized power injection Photovoltaic system Power quality Three-Phase inverter Voltage imbalance

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Three-dimensional acoustic Chern insulators with arbitrary Chern vectors

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Physical Review Research 2025年第2期7卷 023280-023280页

作者： Linyun Yang Xiang Xi Yan Meng Zhenxiao Zhu Ying Wu Jingming Chen Minqi Cheng Kexin Xiang Perry Ping Shum Yihao Yang Hongsheng Chen Jian Li Bei Yan Gui-Geng Liu Baile Zhang Zhen Gao State Key Laboratory of Optical Fiber and Cable Manufacturing Technology Department of Electronic and Electrical Engineering Guangdong Key Laboratory of Integrated Optoelectronics Intellisense Southern University of Science and Technology Shenzhen 518055 China College of Aerospace Engineering Chongqing University Chongqing 400030 China School of Electrical Engineering and Intelligentization Dongguan University of Technology Dongguan 523808 China School of Science Nanjing University of Science and Technology Nanjing 210094 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University 310027 Hangzhou China School of Science Westlake University 18 Shilongshan Road Hangzhou 310024 Zhejiang Province China Hubei Province Key Laboratory of Systems Science in Metallurgical Process and College of Science Wuhan University of Science and Technology Wuhan 430081 China Department of Electronic and Information Engineering School of Engineering Westlake University Hangzhou 310030 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore 639798 Singapore

The Chern vector is a vectorial generalization of the scalar Chern number, being able to characterize the topological phases of three-dimensional (3D) Chern insulators. Such a vectorial generalization extends the applicability of Chern-type bulk-boundary correspondence from one-dimensional edge states to two-dimensional surface states, whose unique features, such as robust chiral surface states and forming nontrivial torus knots or links in the surface Brillouin zone, have been demonstrated recently in 3D photonic crystals. However, to date, the Chern vectors have been limited to the simplest form with only one nonzero component, resulting in the chiral surface states only propagating along four side surfaces parallel to the Chern vector, and the surface-state torus knots or links emerging, not on the surface of a single crystal as in other 3D topological phases, but only along an internal domain wall between two crystals with perpendicular Chern vectors. Here, we extend the 3D Chern insulator phase to acoustic crystals for sound waves and propose a scheme to construct an arbitrary Chern vector with multiple nonzero components that allow the chiral surface states to propagate along all six surfaces and the emergence of surface-state torus knots or links on the surface of a single crystal. These results provide a complete picture of bulk-boundary correspondence for Chern vectors and may have potential applications in designing topological acoustic devices.

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Blueshift: Rebalancing engineering engagement, integrity, and learning outcomes across an electronically-enabled remediation hierarchy

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computers in Education Journal 2019年第1期10卷 1-12页

作者： DeMara, Ronald F. Sheikhfaal, Shadi Wilder, Paul J. Chen, Baiyun Hartshorne, Richard Department of Electrical Engineering and Computer Science University of Central Florida OrlandoFL32816 United States Department of Engineering Computer Program and Technology Valencia College OrlandoFL32811 United States Center for Distributed Learning University of Central Florida OrlandoFL32816 United States Division Dean for Learning Sciences Educational Research University of Central Florida OrlandoFL32816 United States

With a growing number of enrollments in engineering programs, more time and energy for tutoring and grading exams/quizzes is necessary. The BLUESHIFT framework utilizes a synergistic combination of faculty, Graduate Teaching Assistants, and educational technologies to provide reliable approaches to not only meet the increased time, cost, and energy efficiency needed for increasing numbers of engineering students, but also to focus on improving the quality of education, skills, and employability of our graduates in computing-related fields. An Evaluation and Proficiency center (EPC) has been piloted at a large state university, where key elements of the BLUESHIFT learning flow have been integrated into selected undergraduate engineering courses. The EPC integrates computer-based evaluation with a close-knit review and learning cycle based on directed and open tutoring. This approach has received overwhelmingly positive responses from students regarding the effectiveness of pedagogical approaches (i.e., Exemplar Vignettes, content tutoring), assessment models (i.e., electronically delivered quizzes, flexible scheduling, use of testing center), and tutoring strategies (i.e., self-paced, exam results review). Survey results have been positive with respect to student perceptions across a variety of perspectives compared to paper-based delivery. In this manuscript, the BLUESHIFT framework and process, as well as results collected from student performance and perceptions of the initial implementation, will be addressed. © 2019 American Society for engineering Education. All rights reserved.

关键词： Students

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Depinning of the charge-density waves in Quasi-2D 1T-TaS2 devices operating at room temperature

arXiv

引用

arXiv 2021年

作者： Mohammadzadeh, A. Rehman, A. Kargar, F. Rumyantsev, S. Smulko, J.M. Knap, W. Lake, R.K. Balandin, Alexander A. Nano-Device Laboratory Department of Electrical and Computer Engineering Bourns College of Engineering University of California RiversideCA92521 United States CENTERA Laboratories Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland Phonon Optimized Engineered Materials Center Materials Science and Engineering Program Bourns College of Engineering University of California RiversideCA92521 United States Department of Metrology and Optoelectronics Gdańsk University of Technology Gdańsk80-233 Poland Centre for Advanced Materials and Technologies CEZAMAT Warsaw University of Technology Warsaw02-822 Poland Laboratoire Charles Coulomb University of Montpellier and CNRS Montpellier34950 France Laboratory for Terascale and Terahertz Electronics Department of Electrical and Computer Engineering University of California RiversideCA92521 United States

We report on depinning of nearly-commensurate charge-density waves in 1T-TaS2 thin-films at room temperature. A combination of the differential current-voltage measurements with the low-frequency noise spectroscopy provide unambiguous means for detecting the depinning threshold field in quasi-2D materials. The depinning process in 1T-TaS2 is not accompanied by an observable abrupt increase in electric current – in striking contrast to depinning in the conventional charge-density-wave materials with quasi-1D crystal structure. We explained it by the fact that the current density from the charge-density waves in the 1T-TaS2 devices is orders of magnitude smaller than the current density of the free carriers available in the discommensuration network surrounding the commensurate charge-density-wave islands. The depinning fields in 1T-TaS2 thin-film devices are several orders of magnitude larger than those in quasi-1D van der Waals materials. Obtained results are important for the proposed applications of the charge-density-wave devices in electronics. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

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Planar chiral metasurfaces with maximal tunable chiroptical response driven by bound states in the continuum

arXiv

引用

arXiv 2021年

作者： Shi, Tan Deng, Zi-Lan Geng, Guangzhou Zeng, Yixuan Hu, Guangwei Overvig, Adam Li, Junjie Qiu, Cheng-Wei Alù, Andrea Kivshar, Yuri S. Li, Xiangping Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou510632 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100191 China Department of Electrical and Computer Engineering National University of Singapore Kent Ridge 117583 Singapore Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Nonlinear Physics Center Australian National University CanberraACT2601 Australia

optical metasurfaces with high-Q chiral resonances can boost light-matter interaction for various applications of chiral response for ultrathin, active, and nonlinear metadevices. Usually, such metasurfaces require sophisticated depth-resolved nanofabrication to realize subwavelength stereo-nanostructures, posing overwhelming challenges, especially in the short-wavelength range. Here, we suggest a novel planar design for chiral metasurfaces supporting bound states in the continuum (BICs) and demonstrate experimentally chiroptical responses with record-high Q-factors (Q=390) and near-perfect circular dichroism (CD=0.93) at optical frequencies. The symmetry-reduced meta-atoms are highly birefringent and support winding elliptical eigen-polarizations with opposite helicity surrounding the BIC polarization singularity, providing a convenient way for achieving maximal planar chirality tuned by either breaking in-plane symmetry or changing illumination direction. Such sharply resonant chirality realized in planar metasurfaces promises various practical applications in classical and quantum optics including chiral sensing, enantiomer selection, and chiral quantum emitters. © 2021, CC BY.

关键词： Dichroism

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Reconfigurable Intelligence Surface Assisted Opportunistic Multiple Access in UAV-IoT Networks

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IEEE Internet of Things Journal 2025年

作者： Zhang, Xi-Ran Sun, Wen-Bin Zhang, Zhaolin Wang, Ling Gao, Ang Cheng, Nan Meng, Wei-Xiao Leung, Victor C. M. Northwestern Polytechnical University School of Electronics And Information Xi'an China Xidian University State Key Laboratory of ISN Xi'an710071 China Xidian University School of Cyber Engineering Xi'an710071 China Harbin Institute of Technology Communication Research Center Harbin150001 China Shenzhen University College of Computer Science and Software Engineering Shenzhen518060 China The University of British Columbia Department of Electrical and Computer Engineering VancouverBCV6T1Z4 Canada

Due to the advantages of flexible deployment and strong environmental adaptability of an unmanned aerial vehicle (UAV), UAVs serve as aerial base stations (BSs) to meet Quality of Services (QoSs) of ground users in internet of things (IoT) networks. NOMA (Non-Orthogonal Multiple Access) is a potential technique in wireless communications area, which can significantly improve sum spectrum efficiency (SE) of systems. To avoid the limitation of perfect CSI, opportunistic beamforming (OBF) is proposed, where a set of randomly generated weights is used to preprocess transmitted signals. Due to multiuser diversity gain introduced by OBF, OBF-NOMA systems can achieve approximate sum SE to conventional NOMA systems. Additionally, reconfigurable intelligent surfaces (RISs) are involved to overcome obstruction and obtain further improvements of SE. Therefore, this paper proposes a RIS-aid OBF-NOMA system in UAV-IoT networks, where random weights and opportunistic phase matrix are respectively applied in a UAV and RIS. Statistical characteristics of equivalent channels are derived in Nakagami-m (m≥1) fading channels. Theoretical asymptotic analyses of SE and bit error rate (BER) are then presented. Furthermore, a non-convex optimization problem is formulated to maximize SE. To obtain the optimal solution, we divide the problem into two sub-optimization problems and apply a joint iterative algorithm. Numerical results show that the proposed method achieves a satisfactory SE without complex channel estimation and perfect CSI. © 2014 IEEE.

关键词： Micro air vehicle (MAV)

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Arbitrary synthetic dimensions via multi-boson dynamics on a one-dimensional lattice

arXiv

引用

arXiv 2021年

作者： Cheng, Dali Peng, Bo Wang, Da-Wei Chen, Xianfeng Yuan, Luqi Fan, Shanhui State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou310027 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Jinan Institute of Quantum Technology Jinan250101 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan250358 China Ginzton Laboratory and Department of Electrical Engineering Stanford University StanfordCA94305 United States

The synthetic dimension, a research topic of both fundamental significance and practical applications, is attracting increasing attention in recent years. In this paper, we propose a theoretical framework to construct arbitrary synthetic dimensions, or N-boson synthetic lattices, using multiple bosons on one-dimensional lattices. We show that a one-dimensional lattice hosting N indistinguishable bosons can be mapped to a single boson on a N-dimensional lattice with high symmetry. Band structure analyses on this N-dimensional lattice can then be mathematically performed to predict the existence of exotic eigenstates and the motion of N-boson wavepackets. As illustrative examples, we demonstrate the edge states in two-boson Su-Schrieffer-Heeger synthetic lattices without interactions, interface states in two-boson Su-Schrieffer-Heeger synthetic lattices with interactions, and weakly-bound triplon states in three-boson tight-binding synthetic lattices with interactions. The interface states and weakly-bound triplon states have not been thoroughly understood in previous literatures. Our proposed theoretical framework hence provides a novel perspective to explore the multi-boson dynamics on lattices with boson-boson interactions, and opens up a future avenue in the fields of multi-boson manipulation in quantum engineering. © 2021, CC BY.

关键词： Bosons

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Optimizing for periodicity: a model-independent approach to flux crosstalk calibration for superconducting circuits

arXiv

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arXiv 2022年

作者： Dai, X. Trappen, R. Yang, R. Disseler, S.M. Basham, J.I. Gibson, J. Melville, A.J. Niedzielski, B.M. Das, R. Kim, D.K. Yoder, J.L. Weber, S.J. Hirjibehedin, C.F. Lidar, D.A. Lupascu, A. Institute for Quantum Computing Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Lincoln Laboratory Massachusetts Institute of Technology LexingtonMA02421 United States Department of Physics and Astronomy Dartmouth College HanoverNH03755 United States Departments of Electrical & Computer Engineering Chemistry and Physics Center for Quantum Information Science & Technology University of Southern California Los AngelesCA90089 United States Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada

Flux tunability is an important engineering resource for superconducting circuits. Large-scale quantum computers based on flux-tunable superconducting circuits face the problem of flux crosstalk, which needs to be accurately calibrated to realize high-fidelity quantum operations. Typical calibration methods either assume that circuit elements can be effectively decoupled and simple models can be applied, or require a large amount of data. Such methods become ineffective as the system size increases and circuit interactions become stronger. Here we propose a new method for calibrating flux crosstalk, which is independent of the underlying circuit model. Using the fundamental property that superconducting circuits respond periodically to external fluxes, crosstalk calibration of N flux channels can be treated as N independent optimization problems, with the objective functions being the periodicity of a measured signal depending on the compensation parameters. We demonstrate this method on a small-scale quantum annealing circuit based on superconducting flux qubits, achieving comparable accuracy with previous methods. We also show that the objective function usually has a nearly convex landscape, allowing efficient optimization. Copyright © 2022, The Authors. All rights reserved.

关键词： Crosstalk

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Multiband monopole antenna for ISM, WiFi and satellite communication applications 15

Multiband monopole antenna for ISM, WiFi and satellite commu...

引用

15th International Conference on Emerging Technologies, ICET 2019

作者： Ishtiaq, Madeeha Khan, Asif Islam, Zia Ul Iqbal, Amjad Abdul Wali Khan University Department of Computer Science Mardan KPK Pakistan Cecos University of It and Emerging Sciences Department of Electrical Engineering Peshawar Pakistan Center for Wireless Technology Faculty of Engineering Multimedia University Cyberjaya Selangor Malaysia

ISBN: (纸本)9781728154039

In this paper, a multi-band monopole antenna operating at three different frequencies is presented. Antenna presented in this paper has resonant frequencies of 2.2, 5.9, and 8.5 GHz covering bands of 1.92-2.53 GHz (ISM band), 5.65-6.24 GHz (WiFi Band) and 8.34-8.86 GHz (Satellite Communications Band) with 10 dB bandwidths of 610 MHz, 590 MHz and 620 MHz, respectively. The size of the proposed antenna is 24\times 28\times 0.8 mm3. FR-4 material is used as substrate for the proposed antenna. The proposed antenna has good gain at ISM band (>5.09 dBi), WiFi band (>4.92 dBi) and Satellite communication band (>4.94 dBi) along with high efficiency of 88%, 88.9% and 87% respectively, © 2019 IEEE.

关键词： Monopole antennas

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Edge-Native Intelligence for 6G Communications Driven by Federated Learning: A Survey of Trends and Challenges

arXiv

引用

arXiv 2021年

作者： Al-Quraan, Mohammad Mohjazi, Lina Bariah, Lina Centeno, Anthony Zoha, Ahmed Arshad, Kamran Assaleh, Khaled Muhaidat, Sami Debbah, Mérouane Imran, Muhammad Ali James Watt School of Engineering University of Glasgow GlasgowG12 8QQ United Kingdom Technology Innovation Institute 9639 Masdar City Abu Dhabi United Arab Emirates College of Engineering and Information Technology Ajman University Ajman United Arab Emirates Center for Cyber-Physical Systems Department of Electrical Engineering and Computer Science Khalifa University Abu Dhabi127788 United Arab Emirates Department of Systems and Computer Engineering Carleton University OttawaONK1S 5B6 Canada CentraleSupelec University Paris-Saclay Gif-sur-Yvette91192 France

New technological advancements in wireless networks have enlarged the number of connected devices. The unprecedented surge of data volume in wireless systems empowered by artificial intelligence (AI) opens up new horizons for providing ubiquitous data-driven intelligent services. Traditional cloud-centric machine learning (ML)-based services are implemented by centrally collecting datasets and training models. However, this conventional training technique encompasses two challenges: (i) high communication and energy cost and (ii) threatened data privacy. In this article, we introduce a comprehensive survey of the fundamentals and enabling technologies of federated learning (FL), a newly emerging technique coined to bring ML to the edge of wireless networks. Moreover, an extensive study is presented detailing various applications of FL in wireless networks and highlighting their challenges and limitations. The efficacy of FL is further explored with emerging prospective beyond fifth-generation (B5G) and sixth-generation (6G) communication systems. This survey aims to provide an overview of the state-of-the-art FL applications in key wireless technologies that will serve as a foundation to establish a firm understanding of the topic. Lastly, we offer a road forward for future research directions. 1 Copyright © 2021, The Authors. All rights reserved.

关键词： Wireless networks

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