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Controlled Islanding Strategy Considering Uncertainty of Renewable Energy Sources Based on Chance-constrained Model

Journal of Modern Power systems and Clean Energy 2022年第2期10卷 471-481页

作者： Shengyuan Liu Tianhan Zhang Zhenzhi Lin Yilu Liu Yi Ding Li Yang the School of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996USA the School of Electrical Engineering Shandong UniversityJinan 250061China Electrical and Electronics Systems Research Division Oak Ridge National LaboratoryOak RidgeTN 37830USA

Controlled islanding plays an essential role in preventing the blackout of power *** there are several studies on this topic in the past,no enough attention is paid to the uncertainty brought by renewable energy sources(RESs)that may cause unpredictable unbalanced power and the observabilit>T of power systems after islanding that is essential for back-up black-start ***,a novel controlled islanding model based on mixed-integer second-order cone and chance-constrained programming(MISOCCP)is proposed to address these ***,the uncertainty of RESs is characterized by their possibility distribution models with chance constraints,and the requirements,e.g.,system observability,for rapid back-up black-start measures are also ***,a law of large numbers(LLN)based method is em-ployed for converting the chance constraints into deterministic ones and reformulating the non-convex model into convex ***,case studies on the revised IEEE 39-bus and 118-bus power systems as well as the comparisons among different models are given to demonstrate the effectiveness of the proposed *** results show that the proposed model can result in less unbalanced power and better observability after islanding compared with other models.

关键词： Controlled islanding second-order cone chance-constrained programming renewable energy source(RES) black-start observability.

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Maximal antichain lattice algorithms for distributed computations

Maximal antichain lattice algorithms for distributed computa...

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14th International Conference on Distributed Computing and Networking, ICDCN 2013

作者： Garg, Vijay K. Parallel and Distributed Systems Lab. Department of Electrical and Computer Engineering University of Texas at Austin Austin TX 78712 United States

ISBN: (纸本)9783642356674

The lattice of maximal antichains of a distributed computation is generally much smaller than its lattice of consistent global states. We show that a useful class of predicates can be detected on the lattice of maximal antichains instead of the lattice of consistent cuts obtaining significant (exponential for many cases) savings. We then propose new online and offline algorithms to construct and enumerate the lattice of maximal antichains. Previously known algorithm by Nourine and Raynoud [NR99, NR02] to construct the lattice takes O (n2m) time where n is the number of events in the computation, and m is the size of the lattice of maximal antichains. The algorithm by Jourdan, Rampon and Jard [JRJ94] takes O ((n + w2)wm) time where w is the width of the computation. All these algorithms assume as input the lattice of maximal antichains prior to the arrival of a new event. We present a new online incremental algorithm, OLMA, that computes the newly added elements to the lattice without requiring the prior lattice. Since the lattice may be exponential in the size of the computation, we get a significant reduction in the space complexity. The OLMA algorithm takes O (mw2 log w L) time and O (wL w log n) space where wL is the width of the lattice of maximal antichains. The lower space complexity makes our algorithm applicable for online global predicate detection in a distributed system. For the purposes of analyzing offline traces, we also propose new enumeration algorithms to traverse the lattice. © Springer-Verlag 2013.

关键词： Computational complexity

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ADAPTIVE EDGE-FOLLOWING FORCE CONTROL OF AN INDUSTRIAL ROBOT

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ROBOTICS AND computer-INTEGRATED MANUFACTURING 1989年第4期6卷 331-337页

作者： LIOU, JN JAMSHIDI, M STARR, GP CAD Laboratory for Systems/Robotics Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM 87131 United States Robotic Research Laboratory Department of Mechanical Engineering University of New Mexico Albuquerque NM 87131 United States

Control of tool-workpiece interaction force is of vital importance in automated assembly. Using a simple linear continuous model of an edge-following system to predict the appropriate accomodation gains in a force control loop, previous work has shown that force control by accomodation is feasible. Following up this work, this paper describes the analysis, simulation and implementation of an adaptive force control in a two-dimensional edge-following task with a PUMA 560 robot and wrist force sensor. First, a discrete-time model of an edge-following system is developed and then used as the plant; second, a model reference adaptive control (MRAC) scheme is applied to achieve both tracking and regulation purposes. The reference (tracking) model can be determined by experimental reference input and desired model output information; the reference (regulation) model can be obtained by simulation to smooth out the plant output and improve the augmented filtered plant-model error. Study is done on the values of the adaptation gains in the adaptive mechanism, and hence can be adjusted to insure the best plant output performance.

关键词： Robots, Industrial

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Lattice completion algorithms for distributed computations

Lattice completion algorithms for distributed computations

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16th International Conference on Principles of Distributed systems, OPODIS 2012

作者： Garg, Vijay K. Parallel and Distributed Systems Lab. Department of Electrical and Computer Engineering University of Texas at Austin Austin TX 78712 United States

ISBN: (纸本)9783642354755

A distributed computation is usually modeled as a finite partially ordered set (poset) of events. Many operations on this poset require computing meets and joins of subsets of events. The lattice of normal cuts of a poset is the smallest lattice that embeds the poset such that all meets and joins are defined. In this paper, we propose new algorithms to construct or enumerate the lattice of normal cuts. Our algorithms are designed for distributed computing applications and have lower time or space complexity than those of existing algorithms. We also show applications of this lattice to the problems in distributed computing such as finding the extremal events and detecting global predicates. © 2012 Springer-Verlag.

关键词： Distributed computer systems

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A GENERALIZED ENERGY FUNCTION FOR TRANSIENT STABILITY ANALYSIS OF POWER-systems

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IEEE TRANSACTIONS ON CIRCUITS AND systems 1984年第7期31卷 637-645页

作者： NARASIMHAMURTHI, N MUSAVI, MT Department of Electrical and Computer Engineering Power Systems Laboratory University of Michigan Ann Arbor MI USA Department of Electrical Engineering University of Maine Orono ME USA University of Michigan Ann Arbor MI USA

In this paper, an "energy function" is derived for transient stability analysis of power systems. The main contribution of this paper is the generality of the model for the loads. The loads are modeled as constant real power loads but the reactive part of the loads are modeled as arbitrary function of the load bus voltage. This model accounts for the voltage transients of the load busses and for this general model, it is shown that the system satisfies the law of conservation of energy. An efficient algorithm for determining the stability of the system for a given disturbance is described. Results of simulation of the system studied by El-Abiad and Nagappan [2] are included and it is shown that due to the fluctuations in the system voltages, the commonly used energy function over estimates the energy of the system during system transients.

关键词： Power system transients Transient analysis Stability analysis Power system analysis computing Power system stability Power system modeling Load modeling Potential energy Voltage Propagation losses

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Metamaterial absorbers realized in an X-band rectangular waveguide

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Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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PHASE AND FREQUENCY TRACKING ACCURACY IN DIRECT-DETECTION OPTICAL-COMMUNICATION systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 1972年第6期CO20卷 1139-&页

作者： SNYDER, DL RHODES, IB Department of Electrical Engineering and the Biomedical Computer Laboratory Washington University Saint Louis MO USA Laboratory of Control Systems Science and Engineering Washington University Saint Louis MO USA

Lower bounds are given on the attainable mean-square performance in causally tracking the phase and frequency of a subcarrier that modulates an optical carrier in a direct-detection opticalcommunication system.

关键词： Optical modulation Oscillators Stochastic processes Frequency synchronization Phase modulation Intensity modulation Difference equations Gaussian processes Viterbi algorithm Communication system control

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Adjustable and distributionally robust chance-constrained economic dispatch considering wind power uncertainty

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Journal of Modern Power systems and Clean Energy 2019年第3期7卷 658-664页

作者： Xin FANG Bri-Mathias HODGE Fangxing LI Ershun DU Chongqing KANG National Renewable Energy Laboratory GoldenCO80401USA Department of Electrical Engineering and Computer Science The University of TennesseeKnoxvilleTN37996USA State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing100084China

This paper proposes an adjustable and distributionally robust chance-constrained(ADRCC) optimal power flow(OPF) model for economic dispatch considering wind power forecasting uncertainty. The proposed ADRCC-OPF model is distributionally robust because the uncertainties of the wind power forecasting are represented only by their first-and second-order moments instead of a specific distribution assumption. The proposed model is adjustable because it is formulated as a second-order cone programming(SOCP) model with an adjustable *** coefficient can control the robustness of the chance constraints, which may be set up for the Gaussian distribution, symmetrically distributional robustness, or distributionally robust cases considering wind forecasting uncertainty. The conservativeness of the ADRCC-OPF model is analyzed and compared with the actual distribution data of wind forecasting error. The system operators can choose an appropriate adjustable coefficient to tradeoff between the economics and system security.

关键词： Economic dispatch Adjustable and distributionally robust chance-constrained(ADRCC) optimization Wind power forecasting Uncertainty

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Cyber-physical Modeling and Control of Crowd of Pedestrians:A Review and New Framework

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IEEE/CAA Journal of Automatica Sinica 2015年第3期2卷 334-344页

作者： Kecai Cao Yangquan Chen Dan Stuart Dong Yue the College of Automation Nanjing University of Posts and Telecommunications Mechatronics Embedded Systems and Automation Laboratory School of EngineeringUniversity of California the Department of Electrical and Computer Engineering Utah State University

Recent advances in modeling and control of crowd of pedestrians are briefly surveyed in this paper. Possibilities of applying fractional calculus in the modeling of crowd of pedestrians have been shortly reviewed and discussed from different aspects such as descriptions of motion, interactions of long range and effects of memory. Control of the crowd of pedestrians have also been formulated using the framework of cyber-physical systems and been realized using networked Segways with onboard emergency response personnels to regulate the velocity and flux of the crowd. Platform for verification of the theoretical results are also provided in this paper. © 2014 Chinese Association of Automation.

关键词： Calculations Embedded systems

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Mechanical resonant sensing of spin texture dynamics in a two-dimensional antiferromagnet

arXiv

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arXiv 2025年

作者： Yousuf, S.M. Enamul Hoque Wang, Yunong Ramachandran, Shreyas Koptur-Palenchar, John Tarantini, Chiara Xiang, Li McGill, Stephen Smirnov, Dmitry Santos, Elton J.G. Feng, Philip X.-L. Zhang, Xiao-Xiao Department of Electrical & Computer Engineering University of Florida GainesvilleFL32611 United States Institute for Condensed Matter Physics and Complex Systems School of Physics and Astronomy The University of Edinburgh EdinburghEH9 3FD United Kingdom Department of Physics University of Florida GainesvilleFL32611 United States National High Magnetic Field Laboratory TallahasseeFL32312 United States Donostia-San Sebastian20018 Spain Higgs Centre for Theoretical Physics The University of Edinburgh EH9 3FD United Kingdom

The coupling between the spin degrees of freedom and macroscopic mechanical motions, including striction[1], shearing[2], and rotation[3-4], has attracted wide interest with applications in actuation, transduction, and information processing[5-7]. Experiments so far have established the mechanical responses to the long-range ordered[1, 5] or isolated single spin states[8]. However, it remains elusive whether mechanical motions can couple to a different type of magnetic structure, the non-collinear spin textures, which exhibit nanoscale spatial variations of spin (domain walls, skyrmions, etc.) and are promising candidates to realize high-speed computing devices[9-12]. Here, we report the detection of collective spin texture dynamics with nanoelectromechanical resonators made of two-dimensional antiferromagnetic (AFM) MnPS3 with 10-9 strain sensitivity. By examining radio frequency mechanical oscillations under magnetic fields, new magnetic transitions were identified with sharp dips in resonant frequency. They are attributed to the collective AFM domain wall motions as supported by the analytical modeling of magnetostriction and large-scale spin-dynamics simulations. Additionally, an abnormally large modulation in the mechanical nonlinearity at the transition field infers a fluid-like response due to the ultrafast domain motion. Our work establishes a strong coupling between spin texture and mechanical dynamics, laying the foundation for electromechanical manipulation of spin texture and developing quantum hybrid devices. © 2025, CC BY.

关键词： Degrees of freedom (mechanics)

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