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International Conference on Harmonics and Quality of Power

作者： #x00C9 rica Mangueira Lima Núbia Silva Dantas Brito Benemar Alencar de Souza Wellinsílvio Costa dos Santos Laís Martins de Andrade Fortunato Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande - UFCG Campina Grande Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil Undergraduate student in Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil

A study on the length and type of the window function used in the Short-Time Fourier Transform (STFT), along with its suitability to extract the harmonic content from a High Impedance Fault (HIF) current is presented on this paper. Additionally, a method to detect HIF based on the phase angle of the third harmonic current is developed. The proposed algorithm performance is evaluated by two database: one containing HIF simulated signals and other containing actual HIF oscillographic records. This paper presents the current state of this research, and, so far, the method is able to detect HIF occurring in different types of surfaces (wet and dry), as well as it is insusceptible to typical noises present in the real oscillograms.

关键词： Harmonic analysis Time-frequency analysis Signal resolution Fourier transforms Impedance Conductors

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The Michigan Robotics undergraduate Curriculum: Defining the Discipline of Robotics for Equity and Excellence

arXiv

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arXiv 2023年

作者： Jenkins, Odest Chadwicke Grizzle, Jessy Atkins, Ella Stirling, Leia Rouse, Elliott Guzdial, Mark Provost, Damen Mann, Kimberly Millunchick, Joanna Robotics and Electrical Engineering & Computer Science United States Undergraduate Education Robotics Institute United States Robotics Institute United States Graduate Programs Robotics Institute United States Robotics and Industrial Engineering United States Robotics and Mechanical Engineering United States Electrical Engineering & Computer Science United States Engineering Education Research Program United States Undergraduate Education College of Engineering United States University of Michigan United States

The Robotics Major at the University of Michigan was successfully launched inthe 2022-23 academic year as an innovative step forward to better servestudents, our communities, and our society. Building on our guiding principleof "Robotics with Respect" and our larger Robotics Pathways model, the MichiganRobotics Major was designed to define robotics as a true academic disciplinewith both equity and excellence as our highest priorities. Understanding thattalent is equally distributed but opportunity is not, the Michigan RoboticsMajor has embraced an adaptable curriculum that is accessible through adiversity of student pathways and enables successful and sustained career-longparticipation in robotics, AI, and automation professions. The results afterour planning efforts (2019-22) and first academic year (2022-23) have beenhighly encouraging: more than 100 students declared Robotics as their major,completion of the Robotics major by our first two graduates, soaringenrollments in our Robotics classes, thriving partnerships with HistoricallyBlack Colleges and Universities. This document provides our original curricularproposal for the Robotics undergraduate program at the University of Michigan,submitted to the Michigan Association of State Universities in April 2022 andapproved in June 2022. The dissemination of our program design is in the spiritof continued growth for higher education towards realizing equity andexcellence. The most recent version of this document is also available on Google Docsthrough this link: https://***/robotics_majorMSC Codes 97 © 2023, CC BY.

关键词： Curricula

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Fault ride through capability and voltage support in distribution grid with photovoltaic distributed generation

Fault ride through capability and voltage support in distrib...

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IEEE PES Conference on Innovative Smart Grid Technologies (ISGT Latin America)

作者： Leonardo H. M. Leite Wallace Boaventura Luciano de Errico Eduardo Nohme Cardoso Ruan Dutra Bruno Marciano Lopes Universidade Federal de Minas Gerais Belo Horizonte MG BR Graduate Program in Electrical Engineering - Federal University of Minas Gerais - UFMG Undergraduate Course in Electrical Engineering Federal University of Minas Gerais - UFMG Companhia Energetica de Minas Gerais - CEMIG Belo Horizonte MG Brasil

When connected to the power distribution grid, Distributed Generation Photovoltaic (DGPV) systems not only contribute to supply the load demand, but can also assist the grid performance by means of several ancillary services, notably in voltage support after a voltage drop. Main current grid codes and international standards require DGPV units to remain connected even in the event of severe voltage sag. In order to minimize the impacts on the distribution grid, the photovoltaic sources can be used to inject reactive power. This paper discusses the main aspects related to voltage support using DGPV sources and proposes a voltage control architecture, considering the contribution of each DGPV unit and using a distributed communication infrastructure.

关键词： Reactive power Voltage fluctuations Photovoltaic systems Voltage control Voltage measurement Circuit faults

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Exponential Curve-Based Control Strategy for Auxiliary Equipment Power Supply Systems in Railways

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Processes 2023年第4期11卷 1285-1285页

作者： Farooqui, Shoeb Azam Lin, Chang-Hua Lu, Shiue-Der Liu, Hwa-Dong Sarwar, Adil Huang, Liang-Yin Department of Electrical Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Electrical Engineering National Chin-Yi University of Technology Taichung411 Taiwan Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei106 Taiwan Department of Electrical Engineering ZHCET Aligarh Muslim University Aligarh202002 India Graduate Institute of Manufacturing Technology National Taipei University of Technology Taipei106 Taiwan

An exponential curve-based (ECB) control strategy has been proposed in this paper. The proposed ECB control strategy is based on the growth and decay of charge in the series RC circuit and the harmonic elimination by detecting the Fourier expansion series of the auxiliary equipment power supply system’s (AEPSS) three-phase output voltage level. It can quickly adjust each duty cycle to the best value for driving the isolated three-phase inverter (ITPI) and produce a three-phase 380 VAC/60 Hz output. A comparison of the AEPSS output performance using the traditional voltage cancellation method (VCM) and the proposed ECB control strategy was performed. The hardware implementation of the system was performed on the prototype developed in the laboratory. These control strategies are tested under three conditions, i.e., (i) Vi = 550 VDC. (ii) Vi = 750 VDC. (iii) Vi = 800 VDC. The total harmonic distortion (THD) is 13.7%, 14.5%, and 14.9%, and the output voltage Vo is 372.3 VAC, 377.3 VAC, and 385.3 VAC using the traditional control strategy at three test conditions, respectively. However, the THD is 7.2%, 7.8%, and 8.0%, and the output voltage Vo is 382.2 VAC, 381.2 VAC, and 381.9 VAC using the proposed ECB control strategy under the test conditions. It is obvious from the hardware results that the output voltage harmonics and output voltage level for the proposed ECB control strategy are superior to the traditional VCM. The voltage produced from the AEPSS using the proposed ECB control strategy is more stable and has better quality. In addition, the filter size is also reduced. © 2023 by the authors.

关键词： Auxiliary equipment

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Innovative High Step-Up Converter for Improved Photovoltaic Efficiency

Innovative High Step-Up Converter for Improved Photovoltaic ...

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IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Chun-Hsin Chang Hwa-Dong Liu Chang-Hua Lin Rashid Ahmed Khan Yi-Jie Zeng Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei City Taiwan Department of Electrical Engineering National Taiwan University of Science and Technology Taipei City Taiwan Graduate Institute of Green Energy and Sustainable Technology National Taiwan Normal University Taipei City Taiwan

ISBN: (数字)9798350351156

ISBN: (纸本)9798350351163

This study introduces an innovative high step-up (HSU) converter designed for solar photovoltaic systems equipped with a maximum power point (MPP) tracker. This converter efficiently increases the output voltage while maintaining low voltage stress on its components, thanks to a novel combination of primary boost cells, switched capacitors, and voltage multiplier cells. A clamping circuit minimizes leakage energy, enhancing overall efficiency. Testing of a prototype confirmed its effective MPP tracking and high efficiency, with a conversion rate of 20 V-40 V to 380 V at 150 W and efficiencies between 90 % and 96 %.

关键词： Photovoltaic systems Electric potential Renewable energy sources Capacitors Prototypes Voltage Switches Power electronics Stress Testing

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3D Stackable Vertical Ferroelectric Tunneling Junction (V-FTJ) with on/off Ratio 1500x, Applicable Cell Current, Self-Rectifying Ratio 1000x, Robust Endurance of 10⁹ Cycles, Multilevel and Demonstrated Macro Operation Toward High-Density BEOL NVMs

3D Stackable Vertical Ferroelectric Tunneling Junction (V-FT...

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Symposium on VLSI Technology

作者： J.-Y. Lee F.-S. Chang K.-Y. Hsiang P.-H. Chen Z.-F. Luo Z.-X. Li J.-H. Tsai C. W. Liu M. H. Lee Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taiwan Graduate School of Advance Technology National Taiwan University Taiwan Department of Electronics Engineering Institute of Electronics National Yang Ming Chiao Tung University Taiwan Department of Electrical Engineering National Taiwan Normal University Taiwan

A 1500x I LRS /I HRS with a high cell current of ~100 nA/ cell (J = 83 A/cm 2 ) is achieved by antiferroelectric (AFE) vertical ferroelectric tunnel junctions (V-FTJs) that demonstrates multilevel, a self-rectifying rate > 1000x, and macro operation. The stackable 3 D architecture integrating multiple layers of AFE V-FTJs with contact optimization further increases memory density. Robust endurance > 10 9 cycles at |4V| and stable nonvolatile data retention > 10 4 sec with extrapolation to 10 years are achieved. The proposed cell contact V-FTJ by AFE is a promising pathway toward BEOL NVMs by a NAND/NOR-based framework.

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A Novel Isolated Intelligent Adjustable Buck-Boost Converter with Hill Climbing MPPT Algorithm for Solar Power Systems

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Processes 2023年第4期11卷 1010页

作者： Sabir, Bushra Lu, Shiue-Der Liu, Hwa-Dong Lin, Chang-Hua Sarwar, Adil Huang, Liang-Yin Department of Electrical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Department of Electrical Engineering National Chin-Yi University of Technology Taichung411 Taiwan Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei106 Taiwan Department of Electrical Engineering ZHCET Aligarh Muslim University Aligarh202002 India Graduate Institute of Manufacturing Technology National Taipei University of Technology Taipei106 Taiwan

This study proposes a new isolated intelligent adjustable buck-boost (IIABB) converter with an intelligent control strategy that is suitable for regenerative energy systems with unsteady output voltages. It also serves as a reliable voltage source for loads such as battery systems, microgrids, etc. In addition, the hill climbing (HC) maximum power point tracking (MPPT) algorithm can be utilized with this innovative IIABB converter to capture the MPP and then enhance system performance. In this converter, five inductors (LA, LB, LC, LD, and LE) and four power MOSFETs (SA, SB, SC, and SD) are used in the proposed novel isolated intelligent adjustable buck-boost (IIABB) converter to adjust the applied voltage across the load side. It also has a constant, stable output voltage. The new IIABB converter is simulated and verified using MATLAB R2021b, and the performances of the proposed IIABB converter and conventional SEPIC converter are compared. The solar photovoltaic module output voltages of 20 V, 30 V, and 40 V are given as inputs to the proposed IIABB converter, and the total output voltage of the proposed converter is 48 V. In the new IIABB converter, the duty cycle of the power MOSFET has a small variation. The proposed IIABB converter has an efficiency of 92~99%. On the other hand, in the conventional SEPIC converter, the duty cycle of a power MOSFET varies greatly depending on the relationship between the output and input voltage, which deteriorates the efficiency of the converter. As a result, this research contributes to the development of a novel type of IIABB converter that may be employed in renewable energy systems to considerably increase system performance and reduce the cost and size of the system. © 2023 by the authors.

关键词： Buck-Boost converter

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Bi-directional Sub-60mV/dec, Hysteresis-Free, Reducing Onset Voltage and High Speed Response of Ferroelectric-AntiFerroelectric Hf0.25Zr0.75O2 Negative Capacitance FETs

Bi-directional Sub-60mV/dec, Hysteresis-Free, Reducing Onset...

引用

International Electron Devices Meeting (IEDM)

作者： M. H. Lee K.-T. Chen C.-Y. Liao G.-Y. Siang C. Lo H.-Y. Chen Y.-J. Tseng C.-Y. Chueh C. Chang Y.-Y. Lin Y.-J. Yang F.-C. Hsieh S. T. Chang M.-H. Liao K.-S. Li C. W. Liu Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Department of Electrical Engineering National Chung Hsing University Taichung Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Taiwan Semiconductor Research Institute Hsinchu Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan

Being the first demonstration of quasi-antiferroelertic Hf 1-x Zr x O 2 (QAFE-HZO, Zr=75%) negative-capacitance (NC) FET with non-hysteretic bi-directional sub-60mV/dec (SS for =51mV/dec, SS rev =53mV/dec, ΔV T FE o...

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Robust decoupling control synthesis

Robust decoupling control synthesis

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American Control Conference

作者： Marianna A. S. Siqueira Luiz F. G. Silva Eduardo N. Goncalves Reinaldo M. Palhares Ricardo H. C. Takahashi Graduate Program of Electrical Engineering - UFSJ/CEFET-MG Undergraduate Program of Electrical Engineering - CEFET-MG Department of Electrical Engineering Centro Federal de Educacao Tecnologica de Minas Gerais - CEFET-MG Av. Amazonas 7675 Belo Horizonte MG Brazil Department of Electronic Engineering Universidade Federal de Minas Gerais - UFMG Av. Antonio Carlos 6627 Belo Horizonte MG Brazil Department of Mathematics Universidade Federal de Minas Gerais - UFMG Av. Antonio Carlos 6627 Belo Horizonte Brazil

ISBN: (纸本)9781479932757

The control of multivariable industrial processes is frequently performed using a multiloop configuration, in which several PID controllers are committed to control different channels of the plant. A difficulty with such a strategy arises due to the interaction among the control loops, which may cause the control action in a loop to give rise to significant disturbances in other loops. In some cases, it is mandatory to consider a decoupling control that includes a decoupling precompensator, or decoupler, to guarantee acceptable decoupling among the control loops. This paper presents a new robust decoupling control synthesis procedure for multiloop control systems which aims to decouple the different channels of the multivariable system and to guarantee the tracking response performance. The control problem is stated as a non-convex optimization problem which is formulated directly in the space of the PI/PID controllers and precompensator parameters. Poly-topic models represent the system uncertainty. An application example is developed for the control of a quadruple-tank process with emphasis in dealing with the control decoupling when the system is working on a non-minimum phase operating point.

关键词： control ring DECOUPLING control action Standing Orders decoupler system uncertainties multiple loop multiple input multiple output systems synthesis decoupling control

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Photovoltaic power plant submitted to voltage sags: Model and performance evaluation

Photovoltaic power plant submitted to voltage sags: Model an...

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Brazilian Power Electronics Conference, COBEP

作者： Igor A. Pires Alysson Machado Nicole Foureaux Sidelmo M. Silva Braz J. Cardoso Filho José Brito UFMG Belo Horizonte MG Brazil Control and Automation Engineering Undergraduate Course UFMG Belo Horizonte MG Brazil Electrical Engineering Graduate Program UFMG Belo Horizonte MG Brazil Universidade Federal de Minas Gerais Belo Horizonte MG BR Companhia de Eletricidade do Estado da Bahia Salvador BA Brazil

This paper brings the PV model of a real PV farm installation with a total power of 917 kW. All the elements of the PV farm (panels and inverter) are described. Simulation on PSCAD and experimental results at the installation are reported. The PV model is submitted to voltage sags originated in the grid as well as their impact on the photovoltaic power plant.

关键词： Inverters Voltage fluctuations Power quality Photovoltaic systems Radiation effects PSCAD

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