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39th IEEE Power Electronics Specialists Conference (PESC 2008), vol.9

作者： Rafael K. Jardan Istvan Nagy Angel Cid-Pastor Ramon Leyva Abdelali El Aroudi Luis Martinez-Salamero Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Department of Electrical Electronic and Automatic Control Engineering University Rovira i Virgili Tarragona Spain

The growing demand for the utilization of clean energy resources requires consideration of more efficient and economical ways in the usage of available resources and technologies. In the field of solar energy both the efficiency and the economics, i.e. the payback times are crucial questions for a more widespread application of this resource in the future. A novel solution and system are proposed in the paper aimed at enhancing the amount of energy that can be harvested from solar radiation in the same area. The basis of the method presented is a special construction of combined Photovoltaic/Thermal panels that can generate heat power to produce hot water, while the photovoltaic part provides electric power for covering the electric power consumption of loads, to supply its own electronic control units and to operate pump drives etc. The theoretical predictions of the electric part of the system are confirmed by laboratory test results. The system and the overall control structure, including the MPPT control, are presented assuming stand-alone operation but parallel operation is also possible.

关键词： Temperature measurement Resistance heating Construction industry Batteries Converters Capacitors Heat transfer

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Distributed Optimal Power Flow for VSC-MTDC Meshed AC/DC Grids Using ALADIN

arXiv

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arXiv 2022年

作者： Zhai, Junyi Dai, Xinliang Jiang, Yuning Xue, Ying Hagenmeyer, Veit Jones, Colin N. Zhang, Xiao-Ping Qingdao China City & Energy Research Institute Suzhou China Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Germany Automatic Control Laboratory EPFL Switzerland School of Electric Power Engineering South China University of Technology Guangzhou China Department of Electronic Electrical and Systems Engineering University of Birmingham Birmingham United Kingdom

The increasing application of voltage source converter (VSC) based high voltage direct current (VSC-HVDC) technology in power grids has raised the importance of incorporating DC grids and converters into the existing transmission network. This poses significant challenges in dealing with the resulting optimal power flow (OPF) problem. In this paper, a recently proposed nonconvex distributed optimization algorithm—Augmented Lagrangian based Alternating Direction Inexact Newton method (ALADIN), is tailored to solve the nonconvex AC/DC OPF problem for emerging voltage source converter (VSC) based multiterminal high voltage direct current (VSC-MTDC) meshed AC/DC hybrid systems. The proposed scheme decomposes this AC/DC hybrid OPF problem and handles it in a fully distributed way. Compared to the existing state-of-art Alternating Direction Method of Multipliers (ADMM), which is in general, not applicable for nonconvex problems, ALADIN has a theoretical convergence guarantee. Applying these two approaches to VSC-MTDC coupled with an IEEE benchmark AC power system illustrates that the tailored ALADIN outperforms ADMM in convergence speed and numerical robustness. Copyright © 2022, The Authors. All rights reserved.

关键词： Constrained optimization

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Departure Counting Process in a Finite-Buffer Queue with Batch Arrivals and Multiple Vacation Policy

SSRN

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SSRN 2024年

作者： Marjasz, Rafal Kempa, Wojciech M. Kovtun, Viacheslav Institute of Theoretical and Applied Informatics Polish Academy of Sciences 5 Baltycka Str. Gliwice44-100 Poland Silesian University of Technology Faculty of Applied Mathematics 23 Kaszubska Str. Gliwice44-100 Poland Vinnytsia National Technical University Faculty of Intelligent Information Technologies and Automation Department of Computer Control Systems 95 Khmelnitske Shose Str. Vinnytsia21000 Ukraine

The study investigates the departure counting process in a finite-buffer queueing system with batch arrivals and multiple vacation policy. A representation for the mixed double transform of the number of departures up to the fixed time moment is obtained in the explicit form applying analytic approach based on integral equations and linear algebra. Numerical study is attached that focuses on understanding the impact of various system parameters on the behaviour of the mean number of packets processed within a fixed time frame. Utilizing numerical experiments, the study examines the influence of vacation duration, initial buffer state, arrival intensity, and processing rate on the departure process. Results reveal significant dependencies between these parameters and the transient behaviour of the queueing system. Notably, the service speed parameter demonstrates the most substantial influence on the mean number of processed packets, followed by the arrival rate. Conversely, variations in vacation duration and initial packet count exhibit comparatively minor effects on system behaviour. Overall, the findings provide valuable insights into the dynamics of departure processes in finite-buffer queue systems with batch arrivals and multiple vacation policies, offering implications for system optimization and performance enhancement strategies. © 2024, The Authors. All rights reserved.

关键词： Integral equations

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Geometrical Method for Increasing Precision of Machine Building Parts

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Procedia Engineering 2016年 149卷 576-580页

作者： Pavol Božek Aleksander Lozkin Alexey Gorbushin Slovak University of Technology Faculty of Materials Science and Technology Institute of Applied Informatics Automation and Mechatronics J. Bottu 25 Trnava 91724 Slovakia Department of Software M. T. Kalashnikov Izhevsk State Technical University Studencheskaya st. 7 IIzhevsk 426069 Russia Department of Automated Data Processing and Control Systems Glazov branch of Kalashnikov Izhevsk State Technical University Kirova street 36 427622 Glazov Russia

Calculation of complex curves with high accuracy is challenging. The curve is approximated by segments of straight lines and carried out smoothing. A new method of analytic geometry to calculate the trajectories of mechatronic systems and CAD/CAM is offered. The theoretical basis of the method is symmetries in the Euclidean plane. The method can accurately calculate the trajectory for the centrally symmetric conic sections and, in some cases, arbitrary differentiable planar curves. The method gives an accurate analytical solution without using radicals. This allows you to find the formulaic dependencies for further calculations. The existence of Lissajous figures allows assuming the presence of a universal method of calculation of complex trajectories based on planar differentiable curves. Some examples of the design of the kinematic mechanisms are presents additionally.

关键词： mechatronic systems calculation of trajectory symmetries arbitrary curves.

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Preface

Advanced Textbooks in Control and Signal Processing

引用

Advanced Textbooks in control and Signal Processing 2019年 ix-x页

作者： Keviczky, László Bars, Ruth Hetthéssy, Jenő Bányász, Csilla Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary

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Preface

Advanced Textbooks in Control and Signal Processing

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Advanced Textbooks in control and Signal Processing 2019年 xi-xiii页

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Distributed Optimal Power Flow for VSC-MTDC Meshed AC/DC Grids Using ALADIN

Distributed Optimal Power Flow for VSC-MTDC Meshed AC/DC Gri...

引用

IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Junyi Zhai Xinliang Dai Yuning Jiang Ying Xue Veit Hagenmeyer Colin N. Jones Xiao-Ping Zhang College of New Energy China University of Petroleum (UPC) China Karlsruhe Institute of Technology (KIT) Institute for Automation and Applied Informatics Germany Automatic Control Laboratory École Polytechnique Fédérale de Lausanne (EPFL) Switzerland School of Electric Power Engineering South China University of Technology (SCUT) China Department of Electronic Electrical and Systems Engineering University of Birmingham (UBir) Birmingham United Kingdom

The increasing application of voltage source converter (VSC) based high voltage direct current (VSC-HVDC) technology in power grids has raised the importance of incorporating DC grids and converters into the existing transmission network. This poses significant challenges in dealing with the resulting optimal power flow (OPF) problem. In this paper, a recently proposed nonconvex distributed optimization algorithm — Augmented Lagrangian based Alternating Direction Inexact Newton method (ALADIN), is tailored to solve the nonconvex AC/DC OPF problem for emerging voltage source converter (VSC) based multiterminal high voltage direct current (VSC-MTDC) meshed AC/DC hybrid systems. The proposed scheme decomposes this AC/DC hybrid OPF problem and handles it in a fully distributed way. Compared to the existing state-of-art Alternating Direction Method of Multipliers (ADMM), which is in general, not applicable for nonconvex problems, ALADIN has a theoretical convergence guarantee. Applying these two approaches to VSC-MTDC coupled with an IEEE benchmark AC power system illustrates that the tailored ALADIN outperforms ADMM in convergence speed and numerical robustness.

关键词：

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A Numerical Study of Multiphase Flow Boiling Heat Transfer of Nanofluids in the Horizontal Metal Foam Tubes

SSRN

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SSRN 2023年

作者： Azizifar, Shahram Song, Mengjie Chao, Christopher Yu Hang Hosseini, Seyyed Hossein Pekař, Libor Faculty of Mechanical and Energy Engineering Shahid Beheshti University Tehran Iran Department of Energy and Power Engineering Beijing Institute of Technology Beijing China Department of Building Environment and Energy Engineering Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong999077 Hong Kong Department of Chemical Engineering Ilam University Ilam69315-516 Iran Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín Nad Stráněmi 4511 Zlín76005 Czech Republic

The study aims to numerically investigate the flow boiling of Al2O3/H2O and CuO/H2O nanofluids and water in pipes filled with copper metal foams. Four different values of porosity and three values of pore density have been used. To perform numerical simulation, the mixture model has been developed. Also, with the help of user-defined functions, the effects of nanoparticle deposition on the wettability of heating surfaces were considered. The thermal performance of metal foam pipes has been compared with each other by comparing the increase in heat transfer and pressure drop. Besides, the effect of metal foams with different porosities on the onset of nucleate boiling was evaluated. As a result, by reducing the porosity from 0.95 to 0.80, the heat transfer coefficient was increased by 59%, while the pressure drop increased by 28%. Finally, by comparing the increase in heat transfer and pressure drop, results show that the metal foam pipe with 80% porosity and 5 PPI has the best thermal performance. The results of this study are expected to be used for the optimization of advanced phase change cooling technologies. © 2023, The Authors. All rights reserved.

关键词： Pressure drop

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Combined Photovoltaic/Thermal Energy System for Stand-alone Operation

Combined Photovoltaic/Thermal Energy System for Stand-alone ...

引用

2007 IEEE International Symposium on Industrial Electronics (ISIE 2007), vol.6

作者： Rafael K. Jardan Istvan Nagy Angel Cid-Pastor Ramon Leyva Abdelali El Aroudi Luis Martinez-Salamero Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Electrical Electronic and Automatic Control Engineering University of Rovira i Virgili Tarragona Spain Department of Electrical Electronic and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

The utilization of solar energy can be made by photovoltaic (PV) cells to generate electric power directly and solar thermal (T) panels can be applied to generate heat power. When the utilization of the solar energy is necessary to generate electric power, the option of using T panels in combination with some heat/electric power conversion technology can be a viable solution. The power generated by utilizing the solar energy absorbed by a given area of solar panel can be increased if the two technologies, PV and T cells, are combined in such a way that the resulting unit will be capable of co-generation of heat and electric power. In the present paper combined Photovoltaic/Thermal panels are suggested to generate heat power to produce hot water, while the photovoltaic part is used to obtain electric power mainly for covering the electric power consumption of the system, to supply the electronic control units and to operate pump drives etc. Ac and dc supplies are provided by converters for covering self-consumption and possibly the need of some household appliances. The development and design of the system is made by extensive use of modeling and simulation techniques. In the paper a part of the simulation studies, carried out to determine the energy balance in the electric energy conversion section of the system and the control structure, assuming stand-alone operation is presented.

关键词： Photovoltaic systems Solar power generation Power generation Cogeneration Solar energy Solar heating Heat pumps Water heating Temperature control control systems

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APPLICATION OF control THEORETIC TOOLS TO SUPPLY CHAIN DISRUPTION MANAGEMENT

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IFAC Proceedings Volumes 2013年第9期46卷 1926-1931页

作者： Dmitry Ivanov Boris Sokolov Alexandre Dolgui Inna Solovyeva Berlin School of Economics and Law Department of Business Administration Professor Chair of International Supply Chain Management 10825 Berlin Germany Phone: +49 *** St. Petersburg Institute for Informatics and Automation of the RAS (SPIIRAS) V.O. 14 line 39 199178 St. Petersburg Russia Ecole Nationale Supérieure des Mines UMR CNRS 6158 LIMOS 158 Cours Fauriel 42023 Saint-Etienne cedex 2 France St.-Petersburg State University Faculty of Applied Mathematics and Control Processes

Supply chain disruption management aims at real-time supply chain monitoring, alerting supply chain participants about deviations and possible disruptions as well as elaborating adjustment control actions. A basis for the alerting and disruption recovery is a tolerance area of execution parameters' admissible deviations. Two important questions still remain open: (i) how to determine the borders of the tolerance area and (ii) what adjustments steps should be taken to overcome a disruption. In this paper, we propose to use dynamic robustness analysis on the basis of attainable sets and the adaptive adjustment on the basis of positional optimization as an integrated framework to extend existing techniques. We consider supply chain robustness as a dynamic supply chain property that emerges through controlled adaptability on the basis of feedback loops. With the results of this study, the borders of deviations' sectors within the tolerance area can be determined. In each of these sectors, certain adjustment actions at different adaptation levels can be interrelated. Copyright © 2013 IFAC

关键词： supply chain adaptation program control robustness attainable set positional optimization

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