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Distributed Control of Nonlinear Uncertain Systems:A Cyclic-small-gain Approach

IEEE/CAA Journal of Automatica Sinica 2014年第1期1卷 46-53页

作者： Tengfei Liu Zhongping Jiang the State Key Laboratory of Synthetical Automation for Process Industries Northeastern University the Department of Electrical and Computer Engineering Polytechnic Institute of New York University

This paper presents a cyclic-small-gain approach to distributed control of nonlinear multi-agent systems for output agreement. Through a novel nonlinear control law design, the output agreement problem is transformed into a stabilization problem, and the closed-loop multi-agent system is transformed into a large-scale system composed of input-to-state stability(ISS) subsystems which are interconnected with each other through redefined outputs. By forcing the redefined outputs to go to arbitrarily small neighborhoods of the origin, practical consensus is achieved for the agents in the sense that their outputs ultimately converge to each other within an arbitrarily small region. A recently developed cyclic-small-gain result is adopted to assign appropriately the ISS gains to the transformed interconnected system. Moreover, if the system is disturbancefree, then consensus can be guaranteed. Interestingly, the closedloop multi-agent system is also robust to bounded time-delays and disturbances in information exchange.

关键词： Decentralized control Information exchange Multi-agent systems Robustness Uncertain systems Nonlinear systems

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An autonomous frequency and voltage controller for standalone doubly fed induction generator

An autonomous frequency and voltage controller for standalon...

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IEEE Conference on Energy Conversion (CENCON)

作者： Sertac Bayhan Haitham Abu-Rub Department of Electrical and Computer Engineering Texas A&M University at Qatar Doha Qatar Department of Electronic and Automation Gazi University Ankara Turkey Qatar Foundation Qatar Environment and Energy Research Institute Doha Qatar

This paper presents an autonomous frequency and voltage control strategy for a standalone doubly fed induction generator (DFIG). The main aim of this study is to keep stator frequency as well as stator voltage at the desired value under different load and variable wind speed conditions without using position sensor. The proposed sensorless method is based on the detection of the stator frequency and it is designed to operate without a knowledge of any parameter of the DFIG. Hence, the proposed sensorless method can be operated as a model-free. A proportional-integral (PI) controller is used to control rotor currents as well as stator voltage. Simulation studies were performed to verify the dynamic and steady-state performances of the proposed control strategy under different operating conditions. The results show that the proposed strategy not only has an excellent steady-state and dynamic performance, but also exhibits robustness against wind speed and load variations.

关键词： Rotors Stator windings Voltage control Frequency control Simulation Load modeling

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A Ground-Based Multi-Sensor System for Autonomous Landing of a Fixed Wing UAV

A Ground-Based Multi-Sensor System for Autonomous Landing of...

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IEEE International Conference on Robotics and Biomimetics

作者： Weiwei Kong Daibing Zhang Jianwei Zhang College of Mechatronic Engineering and Automation National University of Defense Technology (NUDT) Changsha 410073 China Institute of Technical Aspects of Multimodal systems(TAMS) Department of Computer Science University of Hamburg Germany

ISBN: (纸本)9781467396769

This paper presents a novel ground-based multisensor system for guidance and safe landing of a fixed-wing Unmanned Aerial Vehicle (UAV). Unlike with our previous works, this newly developed system is based on one Pan/Tilt Unit (PTU) with visible light camera laser pointer and Ultrawideband (UWB) radar. To simplify the calibration process in the wide area, a DGPS-based calibration method was designed. As a compensation for camera, we integrated UWB radar module to achieve higher accuracy of localization and implemented laser pointer with retroreflector to enhance the target feature in the distance, which extends the detection range. Then, we used Canny edge detector and Hough transform to track the UAV in the air. Finally, several field experiments with small- and middle-size platforms demonstrate that our system has the ability to acquire the target from a long range and meet the requirements of robustness and real-time capability. Therefore, the proposed system is suitable to complement or replace the GNSS-based position estimation in situations where GNSS information is unavailable or inaccurate.

关键词： UWB UAV inaccurate

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A novel power control strategy for wind-driven permanent magnet synchronous generator based on a single leg multi-mode power converter

A novel power control strategy for wind-driven permanent mag...

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Workshop on Smart Grid and Renewable Energy (SGRE)

作者： Sertac Bayhan Haitham Abu-Rub Ilhami Colak Department of Electrical and Computer Engineering Texas A&M University at Qatar Doha Qatar Department of Electronic and Automation Gazi University Ankara Turkey Qater Environment and Energy and Research Instiute Qatar Foundation Doha Qatar Department of Mechatronic Engineering Istanbul Gelisim University Istanbul Turkey

This paper presents a novel power control strategy for a hybrid power supply system consisting of wind-driven permanent magnet synchronous generator (PMSG) and energy storage device. In this study, a single leg multi-mode power converter, which includes a boost and bidirectional converters to control power flows between energy sources and loads, has been used as a dc/dc converter. This converter has cost effectiveness and fault tolerance features with respect to fewer switches. In order to ensure optimal power flow between energy sources and loads, a novel power control algorithm has been developed. This power control algorithm operates based on input energy from wind turbine, battery state of charge (SOC), and load condition. The proposed system is implemented with Matlab & Simulink software and to verify the performances of the proposed power management control strategy, several simulation studies are performed under different operation conditions. The results show that the proposed system is feasible and applicable.

关键词： Batteries Power control System-on-chip Wind turbines DC-DC power converters Inductors Switches

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A brief review of complex networks in service oriented manufacturing system

A brief review of complex networks in service oriented manuf...

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IEEE Conference on Industrial Electronics and Applications

作者： Yongfeng Lia Ying Zuo Fei Tao D Zhao School of Mathematics and information Engineering Tai Zhou University Zhejiang Lihai 31700 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Department of Electrical and Computer Engineering University of Michigan-Dearborn Dearborn Michigan 48128 USA

ISBN: (纸本)9781479984671

As a hot spot of the academic research, complex networks has got a lot of research results in many applications. But researching in service oriented manufacturing system is less. On this basis, the state-of-the-art of complex networks is overviewed. And then the research model, the conclusion and the future development, which complex networks is applied in service oriented manufacturing system, are sorted and summarized. So as to provide some reference for the research of complex networks in service oriented manufacturing system.

关键词： service-oriented manufacturing complex networks cloud manufacturing manufacturing services resource services

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Experimental Investigation of the Packet Loss Rate of Wireless Industrial Networks in Real Industrial Environments

Experimental Investigation of the Packet Loss Rate of Wirele...

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IEEE International Conference on Information and automation

作者： Yuemin Ding Seung Ho Hong Renzhi Lu Jongbeom Kim Yong Hee Lee Aidong Xu Liang Xiaobing School of Computer and Communication Engineering Tianjin University of Technology Department of Electronics and System Engineering Hanyang University Young Tech. Co. Ltd Shenyang Institute of Automation Institute of Metrology China Electric Power Research Institute

ISBN: (纸本)9781467391054

In the field of wireless industrial automation networks (WIANs), the WirelessHART and ISA100.11a protocols are promoted, which support time division and carrier-sensing multiple access schemes, channel hopping schemes, and mesh network topology to improve reliability and scalability. However, they work on the 2.4-GHz non-licensed industrial, scientific, and medical (ISM) frequency band. This band has become crowded in industrial applications, i.e., ZigBee, Blue-tooth and wireless local area networks (WLAN), which has led to coexistence issues. Here, we investigated experimentally the data link layer packet loss rate of WirelessHART and ISA100.11a protocols coexisting with IEEE 802.15.4 and IEEE 802.11n-based WLAN interference systems. The experimental testbed comprised WirelessHART, ISA100.11a, ZigBee, and IEEE 802.11n-based WLAN systems. During the test, either the WirelessHART or the ISA100.11a served as the system under test and the other systems were used for wireless interferences. WirelessHART and ISA100.11a field devices were developed to set up WirelessHART and ISA100.11a networks systems. All the systems were distributed in a wide and real industrial environment with metal structures and industrial equipment generating interference. Finally, a series of experiments was performed. The experimental results and analysis provide useful information on coexistence issues for system designers and standard developers of WIANs.

关键词： Wireless coexistence Wireless industrial automation Wireless sensor network Packet loss rate

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Forecasting of photovoltaic power generation by RBF neural networks

Forecasting of photovoltaic power generation by RBF neural n...

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3rd International Conference on Micro Nano Devices, Structure and Computing Systems, MNDSCS 2014

作者： Dragomir, Florin Dragomir, Otilia Elena Automation Computer Science and Electrical Engineering Department Valahia University of Targoviste Targoviste Romania

ISBN: (纸本)9783038350750

Recent studies suggest that in order to facilitate higher market and grid penetration of solar power, the users need accurate forecasts of generating power from photovoltaic (PV) plants on multiple time horizons. Despite the large number of forecasting methods, the comparison of results and evaluation of relative advantages between models has been evasive. The general purpose of the paper is to explore the way of performing accurate forecasts of generating power from renewable energy sources so that independent system operators can act consequently. Different aspects of radial basis functions (RBF) neural networks (NNs) are discussed and an illustration of the proposed predictor software interface is given. © (2014) Trans Tech Publications, Switzerland.

关键词： Forecasting

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Experimental investigation of the packet loss rate of wireless industrial networks in real industrial environments

Experimental investigation of the packet loss rate of wirele...

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2015 IEEE International Conference on Information and automation, ICIA 2015 - In conjunction with 2015 IEEE International Conference on automation and Logistics

作者： Ding, Yuemin Hong, Seung Ho Lu, Renzhi Kim, Jongbeom Lee, Yong Hee Xu, Aidong Xiaobing, Liang School of Computer and Communication Engineering Tianjin University of Technology Tianjin300-384 China Department of Electronics and System Engineering Hanyang University Ansan Gyeonggi-do426-791 Korea Republic of Young Tech. Co. Ltd Gimpo-si Gyeonggi-do415-843 Korea Republic of Shenyang Institute of Automation Shenyang Liaoning110-016 China Institute of Metrology China Electric Power Research Institute Beijing110-192 China

ISBN: (纸本)9781467391047

In the field of wireless industrial automation networks (WIANs), the WirelessHART and ISA100.11a protocols are promoted, which support time division and carriersensing multiple access schemes, channel hopping schemes, and mesh network topology to improve reliability and scalability. However, they work on the 2.4-GHz non-licensed industrial, scientific, and medical (ISM) frequency band. This band has become crowded in industrial applications, i.e., ZigBee, Bluetooth and wireless local area networks (WLAN), which has led to coexistence issues. Here, we investigated experimentally the data link layer packet loss rate ofWirelessHART and ISA100.11a protocols coexisting with IEEE 802.15.4 and IEEE 802.11n-based WLAN interference systems. The experimental testbed comprised WirelessHART, ISA100.11a, ZigBee, and IEEE 802.11n-based WLAN systems. During the test, either the WirelessHART or the ISA100.11a served as the system under test and the other systems were used for wireless interferences. WirelessHART and ISA100.11a field devices were developed to set up WirelessHART and ISA100.11a networks systems. All the systems were distributed in a wide and real industrial environment with metal structures and industrial equipment generating interference. Finally, a series of experiments was performed. The experimental results and analysis provide useful information on coexistence issues for system designers and standard developers of WIANs. © 2015 IEEE.

关键词： Wireless sensor networks

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Wearable learning technology: A smart way to teach elementary school students

Wearable learning technology: A smart way to teach elementar...

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Learning and Technology Conference (L&T)

作者： Rooh ul Amin Irum Inayat Basit Shazad School of Automation Northwestern Polytechnical University Xi'an China Department of Software Engineering University of Malaya Kuala Lumpur Malaysia College of Computer and Information Science King Saud University Riyadh Saudi Arabia

ISBN: (纸本)9781479983476

The immense growth of technology in past few decades has its due effect on academia, as well. To meet the growing needs of present generation's anticipation for technology, smart wearable devices are introduced in the field of education. So far, the smart technology is becoming popular for its effective usage in education among university level students. However, making use of smart wearable devices for educating young children of elementary school level is still a challenge. It is yet to be explored that how do the children of elementary school level perceive and react to smart wearable devices? In this paper, we aim to state the usage of smart wearable technology for learning and education purpose of elementary level children. This paper reports the feasibility and explains the benefits of using smart wearable technology while teaching elementary school students.

关键词： Education Games Shape Instruments Writing computers Clocks

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A 3-D Magnetic Equivalent Circuit of an Axial-Flux MEMS Micromotor

A 3-D Magnetic Equivalent Circuit of an Axial-Flux MEMS Micr...

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IEEE International Conference on Applied Superconductivity and Electromagnetic Devices

作者： Xiao Feng Ding Guan Liang Liu Hong Guo Hua Bai School of Automation Science and Electrical Engineering BeiHang University Department of Electrical and Computer Engineering Kettering University

ISBN: (纸本)9781467381086

This paper presents a novel axial-flux microelectromechanical systems (MEMS) based micromotor with dual-rotor and 10mm diameter. The characteristics of MEMS micromotor are analyzed and modeled using a 3-D magnetic equivalent circuit (MEC) taking the leakage fluxes and fringing effect into account. Such methodology yields more accurate prediction of the flux distribution inside the machine, back electromotive force (EMF) waveform and the torque. The key point of the analytical model is to compute the magnetic flux density in the air gap generated by the permanent magnet. An accurate prediction method of the leakage fluxes based on an improved pigeon-inspired optimization (PIO) algorithm is proposed in this paper. The feasibility of the proposed method is validated by the 3-D finite element analysis (FEA). Finally, the method is applied to design and manufacture the micromotor.

关键词： Mircoelectomechanical systems (MEMS) mircomotor Magnetic equivalent circuit (MEC) Leakage flux Finite element analysis (FEA)

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