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Power theory of electrical circuits with quasi-periodic waveforms of voltages and currents

EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1996年第5期6卷 321-328页

作者： Czarnecki, LS [?]Leszek S. Czarnecki (1939) received the M.Sc. and Ph.D. degrees in electrical engineering and Habil. Dr. degree from the Silesian Technical University Poland in 1963 1969 and 1984. respectively. where he was employed as an Assistant Professor. Since 1984 he worked for two years at the Power Engineering Section Division of Electrical Engineering National Research Council of Canada as a Visiting Research Officer. In 1987 he joined the Electrical Engineering Dept. at Zielona Cora Technical University. In 1989 he joined the Electrical and Computer Engineering Dept. of the Louisiana State University (LSU) Baton Rouge NSA as an Associate Professor. For developing a power theory of asymmetrical three-phase systems with non-sinusoidal waveforms he was elected to the grade of Fellow IEEE in 1996. His research interests include network analysis and synthesis power flow in non-sinusoidal systems compensation and power-quality improvement in non-sinusoidal unbalanced systems and power electronics. (Electrical and Computer Eng. Louisiana State University Baton Rougel USA Louisiana70803 T+ I5 0413 88-5241 Fax + I5 W 3 88-52 00 Internet page: http://***/Cape Canaveral/4739)

Generally known current and power equations of electrical circuits cannot be used in situations where the voltage and current waveforms are non-periodic. The paper suggests that these equations could be applied to systems with quasi-periodic waveforms, however, as approximate models of the power-related phenomena. The concepts of the running RMS and complex RMS values, as well as the running active power are introduced for that purpose and applied for generalizing the current and power equations of the single-phase and three-phase circuits with time-variant parameters. Fast iterative algorithms for calculating the running quantities make it possible to integrate the frequency-domain and the time-domain approaches into a kind of the time and frequency-domain model of the power-related phenomena in circuits with quasi-periodic waveforms.

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Silver Nanoparticles Incorporated in Aluminum Doped ZnO for Heterojunction Solar Cells

Silver Nanoparticles Incorporated in Aluminum Doped ZnO for ...

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IEEE Photovoltaic Specialists Conference

作者： Juhyung Yun Eric Kozarsky Joondong Kim Hossein Shokri Kojori Sung-Jin Kim Chong Tong Jun Wang Wayne A. Anderson Dept. of Electrical Engineering University at Buffalo Buffalo NY USA Nano-Mechanical Systems Research Division Korea Institute of Machinery and Materials Daejeon Korea Dept. of Electrical and Computer Engineering University of Miami Coral Gables FL USA

ISBN: (纸本)9781467300643

AZO/Si heterojunction solar cells were fabricated and investigated. In this structure AZO plays a role as a transparent current spreading layer and rectifying junction with silicon (Si). Furthermore, by introducing silver nanoparticles (Ag NPs) inside of the AZO film, light harvesting was enhanced because of plasmonic and light scattering effects ensuring minimized electrical and optical loss within the AZO. AZO was grown by co-sputtering of ZnO and Al. AZO (Al 5.78 wt%) was deposited on Si with 20, 40 nm of thickness. Ag NPs were then spread by spin coating and 230 nm of AZO was deposited again having a sandwich-like structure. In SEM observation, Ag NPs covered 4.7 % of the front surface. Solar cells were fabricated using Al front and back contacts with the size of 0.25 cm~2. computer simulations were carried out to optimize current gain regarding a total photon energy into Si. In calculation, absorption enhancement is maximized when Ag NPs are located as close to the Si layer in the range of 10 ~ 40 nm. Experimentally, 20 nm of bottom AZO showed the best result in terms of efficiency. Spectral response showed 15 % enhancement at 430 nm and 5 ~ 10% enhancement within 600 ~ 1000 nm. Best performance was shown to have 0.36 V of Voc, 28.3 mA/cm2 of Jsc and an efficiency of 5.91 %.

关键词： Al doped ZnO Heterojunction Solar cells Plasmonics Ag nanoparticles

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Dual Inverter Parallel Consequent Pole PM-Assisted Two-Layer Sub-Harmonic Synchronous Machine

Dual Inverter Parallel Consequent Pole PM-Assisted Two-Layer...

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IEEE Conference on Electromagnetic Field Computation

作者： S M Sajjad Hossain Rafin Qasim Ali Osama A. Mohammed Dept. of Electrical and Computer Engineering Energy Systems Research Laboratory Florida International University Miami Florida USA Department of Electrical Engineering Sukkur IBA University Sukkur Pakistan

ISBN: (数字)9798350348958

ISBN: (纸本)9798350348965

A parallel consequent pole PM-assisted 2-layer subharmonic machine consisting of dual inverter topology is proposed here, which is designed to enhance torque generation and control compared to its predecessors. The stator of the sub-harmonic synchronous machine has two sets of 3-phase windings, and the dual inverter supplies current to them separately. Similarly, the rotor has two concentric windings, one for field excitation and the other for harmonic excitation. To validate the proposed model, an 8-pole, 48-slot, 2-inverter, 2-layer sub-harmonic machine is designed and simulated through 2-D finite element analysis. The results show a better torque and performance than the subharmonic and wound field synchronous machines.

关键词： Performance evaluation Torque Windings Stator windings Rotors Motors Harmonic analysis

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The Impact of the Energy Storage System Operation Strategy on Power Grid Reliability

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Transactions of the Korean Institute of Electrical Engineers 2021年第12期70卷 1820-1826页

作者： Kim, Beopsoo Lee, Dayoung Rusetskii, Nikita Shusterzon, Konstantin Sidorov, Denis Kim, Insu Dept. of Electrical Engineering Inha University Korea Republic of Dept. of Electrical and Computer Engineering Inha University Korea Republic of School of Information Technology and Data Science Irkutsk National Research Technical University Russia Energy Systems Institute Siberian Branch Russian Academy of Sciences Russia

Based on the empirical data published by the Korea Electric Power Exchange and the Korea Meteorological Administration, we present a methodology that predicts the system marginal prices. For this purpose, this study uses the long-short term memory (LSTM) technique, which is commonly used in time-series prediction problems. As a result, we present a strategy for operating energy storage systems (ESSs) from the perspective of a prosumer rather than a system operator or conventional utilities. This study also examines the effects of the proposed prosumer actions on the system. The proposed operating strategy is established based on dynamic programming. In particular, this study takes the proposed operation strategy of ESSs the point of view of system reliability. © The Korean Institute of Electrical Engineers This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://***/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

关键词： Reliability

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Extreme Age of Information for Wireless-Powered Communication systems

arXiv

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arXiv 2022年

作者： Miridakis, Nikolaos I. Shi, Zheng Tsiftsis, Theodoros A. Yang, Guanghua The School of Intelligent Systems Science & Engineering Jinan University Zhuhai Campus Zhuhai519070 China Dept. of Informatics and Computer Engineering University of West Attica Aegaleo 12243 Greece

The extreme or maximum age of information (AoI) is analytically studied for wireless communication systems. In particular, a wireless powered single-antenna source node and a receiver (connected to the power grid) equipped with multiple antennas are considered when operated under independent Rayleigh-faded channels. Via the extreme value theory and its corresponding statistical features, we demonstrate that the extreme AoI converges to the Gumbel distribution whereas its corresponding parameters are obtained in straightforward closed-form expressions. Capitalizing on this result, the risk of the extreme AoI realization is analytically evaluated according to some relevant performance metrics, while some useful engineering insights are manifested. Copyright © 2022, The Authors. All rights reserved.

关键词： Antennas

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Strategic equilibrium bidding for electricity suppliers in a day-ahead market using inverse optimization

Strategic equilibrium bidding for electricity suppliers in a...

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IEEE Annual Conference on Decision and control

作者： Ruidi Chen Ioannis Ch. Paschalidis Michael C. Caramanis Division of Systems Engineering Boston University Boston MA USA Dept. of Electrical and Computer Engineering Boston University Boston MA USA Boston University Boston MA US

We consider the problem of devising optimal bidding strategies for electricity suppliers in a day-ahead market where each supplier bids a linear non-decreasing function of its generating capacity for each of the 24 hours. The market operator schedules suppliers based on their bids to meet demand during each hour and determines hourly market clearing prices. Each supplier strives to submit bids that maximize her individual profit, conditional upon other suppliers bids. This process achieves a Nash equilibrium when no supplier is motivated to modify her bid. Solving the profit maximization problem requires information of rivals' bids which are typically not available. We develop an inverse optimization approach for estimating rivals' cost functions given historical market clearing prices and production levels, and use these functions to compute the Nash equilibrium bids. We propose sufficient conditions for the existence and uniqueness of the Nash equilibrium, and provide out-of-sample performance guarantees for the estimated cost parameters. Numerical experiments show that our approach achieves higher profit than the one proposed in [16], which relies instead on the assumption that other suppliers' bids are normally distributed.

关键词： Nash equilibrium Production Biological system modeling Optimization Power markets Schedules

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Expert Knowledge-Based Traction control of a Truck Using Fuzzy Logic

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IFAC Proceedings Volumes 1996年第1期29卷 7867-7872页

作者： Ka C. Cheok Kazuyuki Kobayashi Francis B. Hoogterp Dept. Of Electrical and Systems Engineering School of Engineering and Computer Science Oakland University Rochester MI 48309-4401 Division of Track and Running Gear US Army Tank-automotive and Armament Command (TACOM) Warren MI 48397-5000

This paper describes a fuzzy logic (FL) approach for incorporating an expert knowledge-based Traction control System (TCS) for a four-wheel drive vehicle. The knowledge base is provided by a survey of existing TCS methods, understanding of the TCS hardware components and tyre adhesion characteristics, evaluation of applicable control methods, computer simulation studies, and feedback information from experienced traction test drivers in the automotive industry. The developed FL-bascd TCS was implemented on a Pentium PC system- level traction controller computer installed on a 4x4 pickup truck. Extensive experiments for traction control was conducted at available test facilities and proving grounds. The system-level fuzzy logic approach readily permits modification of old and incorporation of new ideas. The success of this fuzzy logic-based design approach was demonstrated to the government sponsor and industrial partners.

关键词： Traction control fuzzy logic expert knowledge automotive

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Increasing Efficiency of Optimization-based Path Planning for Robotic Manipulators

Increasing Efficiency of Optimization-based Path Planning fo...

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IEEE Conference on Decision and control

作者： Hao Ding Gunther Reissig Olaf Stursberg Institute of Control and System Theory Dept. of Electrical Engineering and Computer Science University of Kassel Germany Chair of Control Eng. (LRT-15) Dept. Aerospace Eng. University of the Federal Armed Forces Munich D-85577 Neubiberg (Munich) Germany

ISBN: (纸本)9781612848006

Path planning for robotic manipulators interacting with obstacles is considered, where an end-effector is to be driven to a goal region in minimum time, collisions are to be avoided, and kinematic and dynamic constraints are to be obeyed. The obstacles can be time-varying in their positions, but the positions should be known or estimated over the prediction horizon for planning the path. This non-convex optimization problem can be approximated by Mixed Integer Programs (MIPs), which usually leads to a large number of binary variables, and hence, to inacceptable computational time for the planning. In this paper, we present a geometric result whose application drastically reduces the number of binary decision variables in the aforementioned MIPs for 3D motion planning problems. This leads to a reduction in computational time, which is demonstrated for different scenarios.

关键词： Path planning Robot Manipulator million instructions per second Manipulators computational time Mixed integer binary decision kinematics

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Intelligent Resource Allocation in Power Grids: Leveraging Variable Neighborhood Search for Optimal Switch Allocation

Intelligent Resource Allocation in Power Grids: Leveraging V...

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IEEE Workshop on Evolving and Adaptive Intelligent systems (EAIS)

作者： Henrique O. Caetano Matheus de S. S. Fogliatto N. Luiz Desuó Benvindo R. Pereira J Carlos D. Maciel Marco Aiello Dept. of Electrical and Computer Engineering São Carlos School of Engineering University of São Paulo Department of Service Computing Institute for Architecture of Application Systems University of Stuttgart

ISBN: (数字)9798350366235

ISBN: (纸本)9798350366242

Within the paradigm of Evolving and Adaptive Intelligent systems, the Electrical Power System (EPS) represents a Critical Infrastructure demanding robust reliability metrics. This study pioneers the application of Variable Neighborhood Search (VNS) heuristic to the Optimal Switch Allocation (OSA) problem in the EPS. Adapting neighborhood structures and local search methods, we consider the joint allocation of Manual Switches and Remote-controlled switches, addressing interdependencies. Results highlight VNS efficacy in navigating OSA challenges, showcasing its adaptability in an evolving system. Comparative analyses endorse VNS as a valuable tool for addressing EPS reliability within the dynamic landscape of evolving and adaptive intelligent systems.

关键词： Adaptive systems Uncertainty Switches Search problems Robustness Power grids Critical infrastructure

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Effects of Salt Spray on c-Si Photovoltaic Modules in the Brazilian Region

Effects of Salt Spray on c-Si Photovoltaic Modules in the Br...

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IEEE Conference Photovoltaic Specialists (PVSC)

作者： Mendelsson R.M. Neves Allan Silveira Hugo S. Alvarez Rodrigo M. Garcia Francisco C. Marques Marcelo G. Villalva Dept. of Systems and Energy - DSE School of Electrical and Computer Engineering Campinas Brazil Communications Department - DECOM School of Electrical and Computer Engineering Campinas Brazil Dept. Research and Development - R&D Build Your Dreams Company - BYD Campinas Brazil Dept. of Applied Physics - DFA Institute of Physics Gleb Wataghin Campinas Brazil

Brazil has great potential for this type of energy generation due to its geographic location, allowing the development of viable photovoltaic (PV) projects in several regions. its use in places close to the sea has increased, with its use on boats and even resorts and hotels. This proximity to the sea requires attention to the local salinity, more precisely to the saline mist. This article will describe the methodology used to carry out the salinity resistance test of PV modules, choosing a specific classification of corrosive atmosphere according to the brazilian environment on the coast where the module will be placed in real conditions.

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