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An Improved Modulation Strategy for Single-phase Three-level Neutral-point-clamped Converter in Critical Conduction Mode

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Journal of Modern Power systems and Clean Energy 2024年第3期12卷 981-990页

作者： Ning Li Yujie Cao Xiaokang Liu Yan Zhang Ruotong Wang Lin Jiang Xiao-Ping Zhang School of Electrical Engineering Xi’an University of TechnologyXi’anChina the Department of Electronics Information and BioengineeringPolitecnico di MilanoMilanItaly Xi’an Jiaotong University Xi’anChina the Department of Electrical Engineering and Electronics University of LiverpoolLiverpoolU.K. the Department of Electronic Electrical and Systems EngineeringUniversity of BirminghamBirminghamU.K.

Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching ***,in highfrequency applications,the number of switching times increases,resulting in significant switching *** solve these issues,this paper proposes an improved modulation strategy for the single-phase three-level neutral-point-clamped(NPC)converter in CRM with *** optimizing the discharging strategy and switching state sequence,the switching frequency and its variation range have been efficiently *** detailed performance analysis is also presented regarding the switching frequency,the average switching times,and the effect of voltage gain.A 2 k W prototype is built to verify the effectiveness of the proposed modulation strategy and analysis *** with the totem-pole PFC converter,the switching frequency regulation range of the three-level PFC converter is reduced by 36.48%and the average switching times is reduced by 45.10%.The experimental result also shows a 1.2%higher efficiency for the three-level PFC converter in the full load range.

关键词： Critical conduction mode(CRM) on-board charger switching frequency range switching times power factor correction(PFC) three-level converter

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A Mathematical and Dynamical Model for Analyzing H-Shaped PM Vernier Motor for Electric Motorcycle Mid-Drive Applications

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IEEE Transactions on Energy Conversion 2025年第1期40卷 529-543页

作者： Ghods, Mehrage Faiz, Jawad Bazrafshan, Mohammad Amin Gorginpour, Hamed Toulabi, Mohammad Sedigh University of Tehran School of Electrical and Computer Engineering College of Engineering Tehran*** Iran Persian Gulf University Department of Intelligent Systems Engineering and Data Science Bushehr*** Iran Oakland University Department of Electrical and Computer Engineering RochesterMI48309 United States

The permanent magnet (PM) Vernier machines enhance torque density and decrease cogging torque compared to conventional permanent magnet synchronous motor. This paper presents a novel fractional-slot H-shaped PM Vernier machines, which incorporates unique design for the PM housing and rotor core construction. These designs are specifically optimized for the small-scale electric vehicles application. The choice of the PM arrangement is based on the combination of V-shaped and spoke-array PM topologies. The aim is to achieve a higher torque density than V-shaped PM machines, while reducing cogging torque compared to spoke-array PM machines. By using this methodology, leakage fluxes in the terminal region of the PMs reduce, resulting in an augmentation of both flux-linkage and power factor. A prototype 680 W motor was fabricated with 12 slots and 8 poles to verify the accuracy and effectiveness of the proposed model. Mathematical model and dynamical analysis are proposed for the analytical prediction of machine performance. Due to the unique shape feature of the machine, the conformal mapping approach is applied to design the rotor core. To validate the model, the predicted performance of the motor was compared with those obtained by finite element analysis and experiments. © 1986-2012 IEEE.

关键词： Permanent magnets

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Self‐adaptive electrostatic discharge performance of ZnO microvaristors doped silicone rubber composites

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High Voltage 2023年第6期8卷 1180-1187页

作者： Ya Sun Zhikang Yuan Jun Hu Zhiwen Huang Xuan Liu Gang Sun Qi Li Jinliang He State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijingChina

With the increase in applied voltage and the decrease in volume,integrated electronic modules have become electrostatic *** microvaristors doped silicone rubber(SiR)composite,with electric field‐dependent conductivity,shows promising prospects for solving the electrostatic *** this study,20 vol%to 50 vol%ZnO/SiR composite films,filled with 10–30μm ZnO microvaristors,were prepared and put into the test of electrostatic *** with the insulating and conducting materials,ZnO/SiR composites achieve the lowest initial voltage and a short time constant of electrostatic *** the increase of ZnO microvaristors volume fraction,from 20%to 50%,the initial voltage and the time constant of electrostatic discharge drop from 1.78 to 0.72 kV and 3.1 ms to 0.4μ*** the ZnO volume fraction is higher than 30%,there is no residual voltage after 0.1 *** explore the reason behind different electrostatic discharge performances of the ZnO/SiR composites,the conductivities of the com-posites were *** is found that the break‐over voltage of the composite drops with the increase in the ZnO microvaristors volume *** a high voltage im-pulse is applied on the ZnO/SiR film,the composite will turn to the conducting state and release the electrostatic charge adaptively so that the initial voltage can be *** work supplies a novel electrostatic discharge idea for electric and electronic devices.

关键词： composites composite rubber

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Measuring Public Wi-Fi Security Awareness via Captive Portal Connections Using a Microcontroller

Measuring Public Wi-Fi Security Awareness via Captive Portal...

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2024 Workshop on Communication Networks and Power systems, WCNPS 2024

作者： Mariano, Hyago Santana Cafe, Daniel Chaves Professional Graduate Program in Electrical Engineering-PPEE Department of Electrical Engineering Brazil

ISBN: (纸本)9798331507152

This article proposes the implementation of a captive portal system on a microcontroller to assess users' maturity regarding the safe use of public Wi-Fi networks. The use of public Wi-Fi networks has become increasingly common in places like cafes, airports, shopping centers, and hotels. However, many users are unaware of the risks associated with using these unsecured networks, such as personal information theft, privacy invasion, and cyberattacks. This study aims to utilize a microcontroller to generate a signal mimicking a known public network, where, upon user login, an educational authentication portal will be displayed. This portal will not only provide information about security risks but also evaluate the users' maturity level in adopting safe practices on public Wi-Fi networks, offering guidelines on how to protect their data and devices. © 2024 IEEE.

关键词： Wi-Fi

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Chattering-Free Fault-Tolerant Cluster Control and Fault Direction Identification for HIL UAV Swarm With Pre-Specified Performance

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 183-197页

作者： Pei-Ming Liu Xiang-Gui Guo Jian-Liang Wang Daniel Coutinho Lihua Xie the Beijing Engineering Research Center of Industrial Spectrum Imaging School of Automation and Electrical Engineering University of Science and Technology Beijing the Shunde Graduate School of University of Science and Technology Beijing IEEE Autonomous Intelligent Systems Department Hangzhou Innovation Institute of Beihang University the Department of Automation and Systems Universidade Federal de Santa Catarina the School of Electrical and Electronic Engineering Nanyang Technological University

In this paper, the problem of pre-specified performance fault-tolerant cluster consensus control and fault direction identification is solved for the human-in-the-loop(HIL) swarm unmanned aerial vehicles(UAVs) in the presence of possible nonidentical and unknown direction faults(NUDFs) in the yaw *** control strategy begins with the design of a pre-specified performance event-triggered observer for each individual *** observers estimate the outputs of the human controlled UAVs, and simultaneously achieve the distributed design of actual control signals as well as cluster consensus of the observer *** is worth mentioning that these observers require neither the high-order derivatives of the human controlled UAVs' output nor a priori knowledge of the initial conditions. The fault-tolerant controller realizes the pre-specified performance output regulation through error transformation and the Nussbaum function. It should be pointed out that there are no chattering caused by the jump of the Nussbaum function when a reverse fault occurs. In addition, to provide a basis for further solving the problem of physical malfunctions, a fault direction identification algorithm is proposed to accurately identify whether a reverse fault has occurred. Simulation results verify the effectiveness of the proposed control and fault direction identification strategies when the reverse faults occur.

关键词： Chattering-free cluster consensus fault direction identification human-in-the-loop (HIL) nonidentical and unknown direction faults (NUDFs) pre-specified performance swarm unmanned aerial vehicles (UAVs)

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How do the non-linear I-V curves of ZnO-based adaptive composites behave with electrodes placed on the opposite sides with a series of horizontal distances?

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High Voltage 2024年第5期9卷 981-988页

作者： Ya Sun Zhikang Yuan Zhiwen Huang Jun Hu Jinliang He Qi Li State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijingChina 2School of Electronic and Information EngineeringTongji UniversityShanghaiChina

Recently,ZnO-based composites have been widely applied in the field of electric *** meet the diverse application requirements,it is necessary to figure out the I-V characteristics of ZnO composites whose high-voltage and ground-voltage electrodes are arranged on the opposite sides with a certain horizontal distance.30 vol%,40 vol%and 50 vol%ZnO-based silicone rubber composites were *** horizontal distance between their electrodes was set as 50,100,500μm,1 and 2 mm,*** showed that with the increase of ZnO fillers volume fraction under a fixed horizontal distance of 100μm,from 30 vol%to 50 vol%,the I-V curves shifted left,the leakage current increased and the switching voltage *** the horizontal distance between electrodes increased from 50μm to 1 mm under a fixed doping concentration of 40%,the I-V curves shifted to the right,the leakage current dropped and the switching voltage *** mathematical and physical models were established to explain the *** work provides a referential significance for the practical application of ZnO composites,such as 5G folding mobile phones and power electronic modules.

关键词： composites rubber linear

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Data-driven output regulation control for constrained linear systems

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Science China(Information Sciences) 2025年第3期68卷 338-353页

作者： Chaoyu XIA Yi DONG Chaoli WANG Shengyuan XU Shanghai Research Institute for Intelligent Autonomous Systems Tongji University College of Electronic and Information Engineering Shanghai Research Institute for Intelligent Autonomous SystemsTongji University Department of Control Science and Engineering School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and Technology Department of Automation Nanjing University of Science and Technology

This study introduces a data-driven approach for state and output feedback control addressing the constrained output regulation problem in unknown linear discrete-time systems. Our method ensures effective tracking performance while satisfying the state and input constraints, even when system matrices are not available. We first establish a sufficient condition necessary for the existence of a solution pair to the regulator equation and propose a data-based approach to obtain the feedforward and feedback control gains for state feedback control using linear programming. Furthermore, we design a refined Luenberger observer to accurately estimate the system state, while keeping the estimation error within a predefined set. By combining output regulation theory, we develop an output feedback control strategy. The stability of the closed-loop system is rigorously proved to be asymptotically stable by further leveraging the concept of λ-contractive sets.

关键词： output regulation constrained system data-driven.

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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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Design and Parametric Optimization of a Doublesided Linear Induction Motor for Hyperloop Pod

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CES Transactions on electrical Machines and systems 2025年第1期9卷 36-45页

作者： Bahaddin Goksun Ismet Sen Musap Kuzucu Bati Eren Ergun Ilhan Kocaarslan Mehmet Onur Gulbahce Electrical Engineering Department Istanbul Technical UniversityIstanbul34469 Turkey Electronics and Communication Engineering Department Istanbul Technical UniversityIstanbul34469 Turkey Robotic and Autonomous Systems Engineering Department Istanbul Technical UniversityIstanbul34469 Turkey

The hyperloop idea, which is one of the most ecofriendly, low-carbon emissions, and fossil fuel-efficient modes of transportation, has recently become quite popular. In this study, a double-sided linear induction motor(LIM) with 500 W of output power, 60 N of thrust force and 200 V/38.58 Hz of supply voltage was designed to be used in hyperloop development competition hosted by the scientific and technological research council of turkey(TüB?TAK) rail transportation technologies institute(RUTE). In contrast to the studies in the literature, concentrated winding is preferred instead of distributed winding due to mechanical constraints. The electromagnetic design of LIM, whose mechanical and electrical requirements were determined considering the hyperloop development competition, was carried out by following certain steps. Then, the designed model was simulated and analyzed by finite element method(FEM), and the necessary optimizations have been performed to improve the motor characteristics. By examining the final model, the applicability of the concentrated winding type LIM for hyperloop technology has been investigated. Besides, the effects of primary material, railway material, and mechanical air-gap length on LIM performance were also investigated. In the practical phase of the study, the designed LIM has been prototyped and tested. The validation of the experimental results was achieved through good agreement with the finite element analysis results.

关键词： Finite element analysis(FEA) Hyperloop Linear induction motor(LIM) Motor design

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Synchrophasor-based Online State Estimated in Large-scale Power Grid

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CSEE Journal of Power and Energy systems 2023年第5期9卷 1613-1622页

作者： Junjie Lin Chao Lu Wenchao Song Yingduo Han Yinsheng Su He Huang Licheng Li the College of Electrical Engineering and Automation Fuzhou UniversityFuzhouChina the Department of Electrical Engineering Tsinghua UniversityBeijingChina the State Key Lab of Power systems Department of Electrical EngineeringTsinghua UniversityBeijingChina China Southern Power Grid GuangzhouChina

With integration of a larger amount of clean power sources and power electronic equipment,operation and dynamic characteristics of the power grid are becoming more and more complicated and ***,it is necessary and urgent to obtain accurate real-time states,which is difficult from traditional state *** paper systematically develops a phasor measurement unit(PMU)based real-time state estimator for a realistic large-scale power grid for the first *** estimator mainly relies on three refined algorithms,i.e.,an improved linear state estimation algorithm,a practical bad data identification method and a distributed topology check ***,a novel system architecture is designed and implemented for the China Southern Power *** simulations and extensive field operation results of the state estimator recorded under both normal and abnormal situations are *** the tests and field results demonstrate the advantages of the proposed algorithms in terms of online system monitoring and feasibility of refreshing the states of the whole system at intervals of tens of milliseconds.

关键词： PMU-based state estimation design and implementation bad data identification topology analysis

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