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Annual Conference of Industrial Electronics Society

作者： Xiaonan Ma Anping Tong Bin Li Lijun Hang Guojie Li Peifeng Shen Hangzhou Dianzi University Hangzhou Zhejiang CN Ministry of Education Key Laboratory of Control of Power Transmission and Conversion (Shanghai Jiao Tong University) Dept. of Electrical and Electronic Engineering Shanghai Jiao Tong University Shanghai China State Grid Jiangsu Electric Power Company Nanjing Power Supply Company Nanjing China College of automation Hangzhou Dianzi University Hangzhou China

The dual active bridge (DAB) topology has been widely used in the industrial field, especially when bidirectional power transfer is required. However, the efficiency improvement of DAB converters is facing challenges and it is worthwhile devoting much effort to it. This paper presents a novel model based on the triple phase shift (TPS) modulation scheme to improve the efficiency of the dual active bridge (DAB) converter. According to the documentary proposed analytic expressions of six different modes of DAB converters, the constraints of zero voltage switching (ZVS) is achieved to further improve the efficiency of DAB converters. It is theoretically verified that almost full ZVS operation range for all the switching devices and quasi-minimum RMS value of the inductor current can be achieved for two operating modes. Finally, the simulating results from MATLAB/Simulink and the experimental results based on a hardware prototype were presented. By comparing the efficiency of the proposed all-ZVS operation and SPS operation, it can be concluded that the experimental results confirm that the novel proposed all-ZVS strategy can decrease the switching loss and increase the efficiency of the DAB converter simultaneously, which verifies the theoretic analysis.

关键词： Zero voltage switching Inductors Bridge circuits Switches Phase modulation Companies

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Multi-power sliding mode guidance for Mars powered descent phase

Multi-power sliding mode guidance for Mars powered descent p...

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UKACC International Conference on control (control)

作者： Yanning Guo Yao Zhang Guangfu Ma Tianyi Zeng Dept. of Control Science and Engineering Harbin Institute of Technology Harbin China School of Automation Beijing Institute of Technology Beijing China

To reach and keep tracking the desired Mars landing trajectory rapidly under various uncertainties and unexpected wind, a power reaching law based sliding mode tracking guidance algorithm is proposed in this paper. The proposed guidance law is composed of three exponential terms, its main improvement is that it can ensure that the lander track the reference trajectory in finite time without chattering. Theoretical proofs are presented to prove its existence, reachability and stabilization characteristics. Compared with existing exponential reaching law, single power reaching law and double power reaching law, simulation results show the effectiveness of the proposed guidance law with a typical Mars powered descent landing scenario.

关键词： Mars Convergence Mathematical model Trajectory optimization Fuels Uncertainty

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Adaptive repetitive visual-servo control of a low-flying unmanned aerial vehicle with an uncalibrated high-flying camera

Adaptive repetitive visual-servo control of a low-flying unm...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Dejun Guo Woosoon Yim Kam K. Leang DARC (Design Automation Robotics & Control) Lab University of Utah Robotics Center Dept. of Mechanical Engineering University of Utah Salt Lake City 84112 United States Intelligent Structures & Control Laboratory Dept. of Mech. Engineering Univ. of Nevada - Las Vegas 89154 United States

ISBN: (纸本)9781509037636

This paper proposes a new adaptive repetitive visual-servo control system for a moving high-flying vehicle (HFV) with an uncalibrated camera to monitor, track, and precisely control the movements of a low-flying vehicle (LFV) or mobile ground robot. When deployed, a remote operator of the HFV defines the desired trajectory for the LFV in the HFV's camera frame (image frame). Due to the circulatory motion of the HFV, the resulting motion trajectory of the LFV in the image frame is periodic in time, thus an adaptive repetitive control system is exploited to improve the tracking precision from one operating period to the next. Not only is the adaptive control law able to deal with uncertainties in the camera's intrinsic and extrinsic parameters, but it can also tolerate uncertainties in the localization of the LFV. The design and stability analysis of the closed-loop control system is presented, where the Lyapunov approach is used to show stability. Simulations and experimental results are presented to demonstrate the effectiveness of the method for controlling the movement of a low-flying quadcopter vehicle. Results show good tracking performance for three simulated test cases, where the average maximum tracking error is reduced by approximately 75% compared to the performance of a standard adaptive visual-servo controller.

关键词： low frequency vibration vehicle Cameras tracking accuracy Repetitive Servo control Closed loop control systems Self tuning control systems visual tracking drone honey bees Unmanned Aerial Vehicle Frame

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On-line generation and arming of system protection schemes

On-line generation and arming of system protection schemes

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Power Quality and Supply Reliability Conference, PQ

作者： Andreas S. Pedersen Mogens Blanke Jakob G. Møller Hjörtur Jóhannsson Automation and Control Group Dept. of Electrical Engineering Technical University of Denmark Kgs. Lyngby Denmark Danmarks Tekniske Universitet Lyngby DK Center for Electric Power and Energy at Dept. of Electrical Engineering Technical University of Denmark Kgs. Lyngby Denmark

This paper presents a new method to automatically generate system protection schemes in real-time, where contingencies are filtered using a method providing N - 1 system snapshots. With future power systems consisting largely of renewable distributed generation with time-varying production, highly fluctuating conditions throughout the day will be the result. This makes off-line design of extensive defense plans for power systems infeasible, forming the motivation for the presented method. It relies on the real-time identification of which disturbances that threatens a power systems integrity. The method is based on a recently proposed method of calculating post-contingency Thevenin equivalents, which are used to assess the security of the post-contingency condition. The contingencies that violate the emergency limits are contained by pre-determining event-based remedial actions. The instability mechanisms threatening the system are individually treated, such that appropriate controls are allocated. The procedure is illustrated through a case study using the Nordic32 benchmark system.

关键词： Power system stability Real-time systems Generators Stability analysis Thermal stability Security Steady-state

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A model-based failure recovery approach for automated production systems combining SysML and industrial standards

A model-based failure recovery approach for automated produc...

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International Conference on Emerging Technologies and Factory automation (ETFA)

作者： Patrick Bareiß Daniel Schütz Rafael Priego Marga Marcos Birgit Vogel-Heuser Technische Universitat Munchen Munchen Bayern DE Dept. of Automatic Control and System Engineering Basque Country University (UPV/EHU) Automation and Information Systems Technical University Munich

ISBN: (纸本)9781509013159

This work presents a failure recovery approach for foreseen failures of automated production systems to minimize the downtime of a system due to stoppages. In contrast to the common practice of implementing field control software, we suggest the use of operation states with pre- and postconditions. A set of operation states forms an operation state machine, whereby several operation state machines are used in a hierarchical manner in order to control and observe the process. The meta-model of the Systems Modeling Language (SysML) is extended to combine operation state machines with OMAC State Machines. By dividing the failure detection from the process controller the necessary flexibility is given to adapt this approach to different packaging machines.

关键词： Unified modeling language Standards automation Adaptation models Manufacturing systems Software Industries

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Diagnosis of wind turbine rotor system

Diagnosis of wind turbine rotor system

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American control Conference

作者： Henrik Niemann Mahmood Mirzaei Lars Christian Henriksen Niels Kjolstad Poulsen Dept. of Electrical Engineering Automation and Control Build. 326 Technical University of Denmark DK-2800 Kgs. Lyngby Denmark Dept. of wind energy Technical University of Denmark DK-2800 Kgs. Lyngby Denmark AF Consult Lyskaer 3F 2730 Herlev Denmark Dept. of Applied Mathematics and Computer Science Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

ISBN: (纸本)9781467386838

This paper describes a model free method for monitoring and fault diagnosis of the elements in a rotor system for a wind turbine. The diagnosis as well as the monitoring is done without using any model of the wind turbine and the applied controller or a description of the wind profile. The method is based on available standard sensors on wind turbines. The method can be used both on-line as well as off-line. Faults or changes in the rotor system will result in asymmetries, which can be monitored and diagnosed. This can be done by using the multi-blade coordinate transformation. Changes in the rotor system that can be diagnosed and monitored are: actuator faults, sensor faults and internal blade changes as e.g. change in mass of a blade.

关键词： Wind turbines Monitoring Sensors Rotors Fault diagnosis Blades Aerodynamics

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CFD simulation of an extreme wave impact on a ship 25

CFD simulation of an extreme wave impact on a ship

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25th International Ocean and Polar engineering Conference, ISOPE 2015

作者： Dorozhko, Veniamin M. Bugaev, Victor G. Kitaev, Maksim V. Lab of High-Precision Optical Methods of Measurement Institute of Automation and Control Processes Far Eastern Branch of Russian Academy of Sciences Russia Dept. of Shipbuilding and Ocean Engineering School of Engineering Far Eastern Federal University Vladivostok Russia

ISBN: (纸本)9781880653890

Extreme waves up to 30m are dangerous for ships and marine engineering structures. During 2006-2010 years the 78 cases have been registered in different sites of the World ocean. From design point of view, it is interesting to know the extreme wave environment, corresponding impact loads on ships and marine structures. The impossibility of full-scale experiments lead application of numerical simulation. The paper presents a numerical procedure and the results of an extreme wave impact on a ship. A special generation method was developed. The propagation and breaking stage of extreme wave life cycle are in the center of attention. The appearance of two maxima of the extreme wave were found using 2D model of hull mid section. The numerical technology allows a designer to assess the stability of a ship by means the plane section method. Obtained technique and the results of numerical simulation can be used for ship and marine engineering structures design process and navigation safety area. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Numerical models

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Smart Sensor Based Obstacle Detection for High-Speed Unmanned Surface Vehicle

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IFAC-PapersOnLine 2015年第16期48卷 190-197页

作者： D. Hermann R. Galeazzi J.C. Andersen M. Blanke Automation and Control Group Dept. of Electrical Engineering Technical University Denmark Lyngby Denmark AMOS CoE Dept. of Engineering Cybernetics Norwegian University of Science and Technology Trondheim Norway

This paper describes an obstacle detection system for a high-speed and agile unmanned surface vehicle (USV), running at speeds up to 30m/s. The aim is a real-time and high performance obstacle detection system using both radar and vision technologies to detect obstacles within a range of 175 m. A computer vision horizon detector enables a highly accurate attitude estimation despite large and sudden vehicle accelerations. This further facilitates the reduction of sea clutter by utilising a attitude based statistical measure. Full scale sea trials show a significant increase in obstacle tracking performance using sensor fusion of radar and computer vision.

关键词： Obstacle detection Sensor fusion Unmanned surface vehicle

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Active Fault Diagnosis in Sampled-data Systems

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IFAC-PapersOnLine 2015年第21期48卷 883-888页

作者： Niemann, Henrik Poulsen, Niels Kjolstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 DK-2800 Kgs. Lyngby Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

The focus in this paper is on active fault diagnosis (AFD) in closed-loop sampleddata systems. Applying the same AFD architecture as for continuous-time systems does not directly result in the same set of closed-loop matrix transfer functions. For continuous-time systems, the LFT (linear fractional transformation) structure in the connection between the parametric faults and the matrix transfer function (also known as the fault signature matrix) applied for AFD is not directly preserved for sampled-data system. As a consequence of this, the AFD methods cannot directly be applied for sampled-data systems. Two methods are considered in this paper to handle the fault signature matrix for sampled-data systems such that standard AFD methods can be applied. The first method is based on a discretization of the system such that the LFT structure is preserved resulting in the same LFT structure in the fault signature matrix as obtained for continuous-time systems. The other method is an approximation method, where the same structure is obtained for small parametric faults. © 2015

关键词： Continuous time systems

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Performance Investigation of Extended Kalman Filter Based Observer for PMSM Using in Washing Machine Applications

Performance Investigation of Extended Kalman Filter Based Ob...

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International Conference on Electrical and Electronics engineering

作者： Handan Nak Mehmet Onur Gülbahce Metin Gokasan Ali Fuat Ergenc Dept. of Control and Automation Engineering Istanbul Technical University Istanbul Turkey Dept. of Electrical Engineering Istanbul Technical University Istanbul Turkey

ISBN: (纸本)9781467379120

In this paper, sensorless speed control of permanent magnet synchronous motor (PMSM) with an Extended Kalman Filter (EKF) based observer is performed. The general model of the PMSM and EKF algorithm are presented. Simulation studies are carried out using MATLAB/Simulink, in order to explore effectiveness and usability of EKF in sensorless PMSM drive for washing machine applications. In order to investigate performance of proposed system in real conditions, real torque profile of a washing machine is used. Simulation results illustrate that the proposed system is quite effective for washing machine applications and robust against variations of motor parameters.

关键词： EKF PMSM MATLAB

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