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Applying agent based simulation to the design of traffic control systems with respect to real-world urban complexity 13th

Applying agent based simulation to the design of traffic con...

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13th European Conference on Multi-Agent systems, EUMAS 2015 and 3rd International Conference on Agreement Technologies, AT 2015

作者： Ion, Andreea Berceanu, Cristian Patrascu, Monica Department of Automatic Control and Systems Engineering University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9783319335087

The problem of reducing traffic congestion in a city has always been difficult to solve with monolithic control methods, which have both high costs and increased implementation complexity. This paper aims to minimize vehicle waiting time at stoplights by using a multi-agent system control technology. Moreover, the system is required to respond adequately to the presence of emergency intervention vehicles, allowing them quick and sure passage, but without significantly interrupting regular traffic. The solution designed in this paper allows for on demand synchronization of intersections, depending on the traffic context at any given time. In order to test this concept, an agent based simulation model has been developed, that offers real world traffic simulations on urban maps, and integrated complex road networks and traffic participant behaviour, with a possibility to measure the performance of the control system through parameters such as noise levels and emissions. © Springer International Publishing Switzerland 2016.

关键词： Distributed parameter control systems

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Fuzzy PID control of lower limb exoskeleton for elderly mobility 20

Fuzzy PID control of lower limb exoskeleton for elderly mobi...

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20th IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR 2016

作者： Rezage, Ghasaq Al Tokhi, M.O. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (纸本)9781467386906

This paper presents investigations into the development of an assistive device for elderly mobility. An exoskeleton is designed as an assistive device, to enhance the lower extremity and provide supporting torque to augment the torque of hip and knee during the walking cycle. A humanoid and actuated exoskeleton frame are designed in solid works and then imported to Visual Nastran 4D virtual environment. Fuzzy PID control algorithm uses to control the actuated exoskeleton. Simulated walking tasks are performed with a humanoid wearing the exoskeleton. It is assumed that the humanoid representing an elderly person, is able to provide 60% of the whole torque required to complete the gait cycle, and the assistive device providing 40% of the overall torque. © 2016 IEEE.

关键词： Virtual reality

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Attitude tracking control for aerobatic helicopters: A geometric approach

arXiv

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arXiv 2017年

作者： Raj, Nidhish Banavar, Ravi N. Abhishek Kothari, Mangal IIT Kanpur IIT Gandhinagar India Systems and Control Engineering IIT Bombay Department of Electrical Engineering IIT Gandhinagar India Department of Aerospace Engineering IIT Kanpur India

We consider the problem of attitude tracking for small-scale aerobatic helicopters. A small scale helicopter has two subsystems: the fuselage, modeled as a rigid body;and the rotor, modeled as a first order system. Due to the coupling between rotor and fuselage, the complete system does not inherit the structure of a simple mechanical system. The coupled rotor fuselage dynamics is first transformed to rigid body attitude tracking problem with a first order actuator dynamics. The proposed controller is developed using geometric and backstepping control technique. The controller is globally defined on SO(3) and is shown to be locally exponentially stable. The controller is validated in simulation and experiment for a 10 kg class small scale flybarless helicopter by demonstrating aggressive roll attitude tracking. Copyright © 2017, The Authors. All rights reserved.

关键词： Navigation

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Invasive weed optimization algorithm optimized fuzzy logic scaling parameters in controlling a lower limb exoskeleton 21

Invasive weed optimization algorithm optimized fuzzy logic s...

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21st International Conference on Methods and Models in Automation and Robotics, MMAR 2016

作者： Rezage, Ghasaq Al Kasdirin, Hyreil A Ali, Siti Khadijah Tokhi, M.O. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (纸本)9781509018666

This paper describes a new modified versions of invasive weed optimization algorithm with exponential seeds-spread factor. The modified invasive weed optimization algorithm (MIWO) is employed to optimize the fuzzy input-output scaling factors of lower limb exoskeleton. A fuzzy logic control (FLC) system with the (MIWO) are evolved for reference tracking control. The exoskeleton is developed to enhance and upgrade the lower limb capability and augment the torque of knee and hip of elderly people during the walking cycle. Invasive weed optimization is a bio-inspired search algorithm that mimics how weeds colonize a certain area in nature. The algorithm is modified by applying local knowledge during distribution of seeds that depends on their cost function value in each generation to narrow the accuracy and improve the local search ability. The obtained results from the modified invasive weed optimization algorithm are compared with heuristic gain values to improve the performance of the exoskeleton system. The Visual Nastran 4D software is used to develop a simulation model of the humanoid and an exoskeleton for testing and verification of the developed control mechanism. Simulation results demonstrating the performance of the adopted approach are presented and discussed. © 2016 IEEE.

关键词： Cost functions

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Performance tradeoffs of dynamically controlled grid-connected inverters in low inertia power systems

arXiv

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arXiv 2017年

作者： Jiang, Yan Pates, Richard Mallada, Enrique Department of Electrical and Computer Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Automatic Control at Lund University Lund Sweden

Implementing frequency response using grid-connected inverters is one of the popular proposed alternatives to mitigate the dynamic degradation experienced in low inertia power systems. However, such solution faces several challenges as inverters do not intrinsically possess the natural response to power fluctuations that synchronous generators have. Thus, to synthetically generate this response, inverters need to take frequency measurements, which are usually noisy, and subsequently make changes in the output power, which are therefore delayed. This paper explores the system-wide performance tradeoffs that arise when measurement noise, power disturbances, and delayed actions are considered in the design of dynamic controllers for grid-connected inverters. Using a recently proposed dynamic droop (iDroop) control for grid-connected inverters, which is inspired by classical first order lead-lag compensation, we show that the sets of parameters that result in highest noise attenuation, power disturbance mitigation, and delay robustness do not necessarily have a common intersection. In particular, lead compensation is desired in systems where power disturbances are the predominant source of degradation, while lag compensation is a better alternative when the system is dominated by delays or frequency noise. Our analysis further shows that iDroop can outperform the standard droop alternative in both joint noise and disturbance mitigation, and delay robustness. Copyright © 2017, The Authors. All rights reserved.

关键词： Frequency response

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Modeling and analysis of secondary controlled virtual synchronous generator with dynamic droop for microgrid

Modeling and analysis of secondary controlled virtual synchr...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Yan, Weihang Gao, David Wenzhong Zhang, Fang Cheng, Lin Yan, Shijie Department of Electrical and Computer Engineering University of Denver Denver United States State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China College of Information Science and Technology Northeastern University Shenyang China

ISBN: (纸本)9781538614273

In this paper, a dynamic droop mechanism is proposed to damp the synchronizing oscillation that exists in a virtual synchronous generator based distributed generator system without varying the steady-state active-power-loop droop coefficient. In order to eliminate the steady-state error introduced due to load changes or generator trips, a distributed secondary controller based on extremum seeking is employed so that microgrid frequency can be restored to nominal value. Besides, the small-signal model of virtual synchronous generator system is presented under d-q reference frame where virtual synchronous generator is deployed as a PV node. Moreover, the linearized system model of virtual synchronous generator with dynamic droop mechanism is derived and its advantage is discussed. Finally, a modified IEEE 14 bus microgrid system is established in Matlab/Simulink platform. Simulation results demonstrate the validity and feasibility of the proposed method. © 2017 IEEE.

关键词： Dynamics

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Towards autonomous reconfiguration in distribution networks: An approach based on finite state automaton models

Towards autonomous reconfiguration in distribution networks:...

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2017 Energy and Sustainability in Small Developing Economies, ES2DE 2017

作者： Košt'álová, Alena Carvalho, Pedro M. S. Kubalčík, Marek Dep. of Computer and Communication Systems Tomas Bata University in Zlin Czech Republic Electrical Engineering and Computer Dep. Instituto Superior Tecnico Lisbon Portugal Department of Process Control Tomas Bata University in Zlin Czech Republic

ISBN: (纸本)9781538620663

The demand on distribution network reconfiguration abilities is increasing. This paper proposes a Finite State Automaton model of a distribution network that deals with topologically safe reconfiguration. Autonomous operation of distribution networks can be designed, analysed and implemented in day-to-day operation with the aid of these automata: through supervisory control. Two approaches to supervisor design are proposed. One for the normal operating mode and the other for the contingency mode. Simple and comprehensive examples illustrate the approaches. © 2017 IEEE.

关键词： Topology

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Laman graphs are generically bearing rigid in arbitrary dimensions

Laman graphs are generically bearing rigid in arbitrary dime...

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IEEE Annual Conference on Decision and control

作者： Shiyu Zhao Zhiyong Sun Daniel Zelazo Minh-Hoang Trinh Hyo-Sung Ahn Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom Research School of Engineering Australian National University Australia Faculty of Aerospace Engineering Technion-Israel Institute of Technology Israel Distributed Control & Autonomous Systems Lab Gwangju Institute of Science and Technology Korea

This paper addresses the problem of constructing bearing rigid networks in arbitrary dimensions. We first show that the bearing rigidity of a network is a generic property that is critically determined by the underlying graph of the network. A new notion termed generic bearing rigidity is defined for graphs. If the underlying graph of a network is generically bearing rigid, then the network is bearing rigid for almost all configurations;otherwise, the network is not bearing rigid for any configuration. As a result, the key to construct bearing rigid networks is to construct generically bearing rigid graphs. The main contribution of this paper is to prove that Laman graphs, which can be generated by the Henneberg construction, are generically bearing rigid in arbitrary dimensions. As a consequence, if the underlying graph of a network is Laman, the network is bearing rigid for almost all configurations in arbitrary dimensions.

关键词： Laplace equations Robot sensing systems Symmetric matrices Conferences

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Current-limiting droop controller with fault-ride-through capability for grid-tied inverters

Current-limiting droop controller with fault-ride-through ca...

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

作者： A. G. Paspatis G. C. Konstantopoulos M. Mayfield V. C. Nikolaidis Dept. Automatic Control and Systems Engineering The University of Sheffield Sheffield UK Dept. Civil and Structural Engineering The University of Sheffield Sheffield UK Dept. Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece

In this paper, the recently proposed current-limiting droop (CLD) controller for grid-connected inverters is enhanced in order to comply with the Fault-Ride-Through (FRT) requirements set by the Grid Code under grid voltage sags. The proposed version of the CLD extends the operation of the original CLD by fully utilizing the power capacity of the inverter under grid faults. It is analytically proven that during a grid fault, the inverter current increases but never violates a given maximum value. Based on this property, an FRT algorithm is proposed and embedded into the proposed control design to support the voltage of the grid. In contrast to the existing FRT algorithms that change the desired values of both the real and reactive power, the proposed method maximizes only the reactive power to support the grid voltage and the real power automatically drops due to the inherent current-limiting property. Extensive simulations are presented to compare the proposed control approach with the original CLD under a faulty grid.

关键词： Inverters Circuit faults Reactive power Voltage control Power quality Guidelines control design

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Topological-darkness-assisted phase regulation for atomically thin meta-optics

arXiv

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arXiv 2019年

作者： Wang, Yingwei Deng, Zi-Lan Hu, Dejiao Yuan, Jian Ou, Qingdong Qin, Fei Zhang, Yinan Ouyang, Xu Peng, Bo Cao, Yaoyu Guan, Bai-Ou Zhang, Yupeng He, Jun Qiu, Chengwei Bao, Qiaoliang Li, Xiangping Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou510632 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University 932 South Lushan Road Changsha Hunan410083 China College of Physics and Electronic Information Huaibei Normal University Huaibei235000 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Electronic Science and Technology Shenzhen University Shenzhen518060 China Monash University ClaytonVIC3800 Australia National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated Devices School of Microelectronics and Solid State Electronics University of Electronic Science and Technology of China Chengdu610054 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117583 Singapore

Two-dimensional (2D) noble-metal dichalcogenides 1, 2 have emerged as a new platform for the realization of versatile flat optics with a considerable degree of miniaturization. However, light field manipulation at the atomic scale is widely considered unattainable since the vanishing thickness and intrinsic losses of 2D materials completely suppress both resonances and phase accumulation effects. Empowered by conventionally perceived adverse effects of intrinsic losses, we show that the structured PtSe2 films integrated with a uniform substrate can regulate nontrivial singular phase and realize atomic-thick meta-optics in the presence of topological darkness 3, 4. We experimentally demonstrate a series of atomic-thick binary meta-optics that allows angle-robust and high unit-thickness diffraction efficiency of 0.96%/nm in visible frequencies, given its thickness of merely 4.3 nm. Our results unlock the potential of a new class of 2D flat optics for light field manipulation at an atomic thickness. Copyright © 2019, The Authors. All rights reserved.

关键词： Platinum compounds

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