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2014 11th World Congress on Intelligent control and automation, WCICA 2014

作者： Luo, Xianxi Yuan, Mingzhe Hong, Xia Huang, Yongzhong Xu, Menghua Jiangxi Province Engineering Research Center of New Energy Technology and Equipment East China Institute of Technology Nanchang Jiangxi China Dept. of Information Service and Intelligent Control Shenyang Institute of Automation Chinese Academy of Science Shenyang Liaoning China Shenyang Institute of Automation Guangzhou Chinese Academy of Science Guangzhou Guangdong China

For the problem of worse performance induced by improper weighted coefficient matrix in data reconciliation algorithm, an innovated indirect method to determine the weighted matrix for data reconciliation is proposed. The method deduces the measurement variances with the estimated constraint residual errors based on the redundancy character. When singular matrix appears in the calculation process of matrix inversion, block matrix together with the known variances from empirical or direct method are applied to compensate the vacant elements of the weighted matrix. Thus the known information is utilized as more as possible to deduce the unknown measurement variances. Compared with the empirical method or direct method, the innovated indirect method shows obvious advantages, and it solves the problem of singular matrix inversion in indirect method. The result of data reconciliation for the flow rate measurement of steam network in an iron& steel corporation shows the method can largely improve the effect of data reconciliation. © 2014 IEEE.

关键词： Data reconciliation Indirect method Innovated Weighted coefficient matrix

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Stabiliser fault emergency control using reconfiguration to preserve power system stability 19

Stabiliser fault emergency control using reconfiguration to ...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Pedersen, Andreas S. Richter, Jan H. Tabatabaeipour, Mojtaba Jóhannsson, Hjörtur Blanke, Mogens Automation and Control Group Dept. of Electrical Engineering Denmark Centre for Electric Power and Energy Dept. of Electrical Engineering Denmark Technical University of Denmark Lyngby2800 Kgs. Denmark Siemens AG Industry Sector Gleiwitzer Str. 555 Nürnberg90475 Germany

ISBN: (纸本)9783902823625

Stabiliser faults in multi-machine power systems are examined in this paper where fault-masking and system reconfiguration of the nonlinear system are obtained using a virtual actuator approach. Phasor Measurement Units, which can be integrated in wide-area transmission grids to improve the performance of power system stabilisers, are utilised when reconfiguring remaining stabilisers after a local failure has made one inoperable. A stability-preserving reconfiguration is designed using absolute stability results for Lure type systems. The calculation of a virtual actuator that relies on the solution of a linear matrix inequality (LMI) is detailed in the paper. Simulation results of a benchmark transmission system show the ability of the fault-tolerant reconfiguration strategy to maintain wide-area stability of a power system despite failure in one of the stabilisers. © IFAC.

关键词： Electric power transmission

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Calculation of critical fault recovery time for nonlinear systems based on region of attraction analysis 19

Calculation of critical fault recovery time for nonlinear sy...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Tabatabaeipour, S. Mojtaba Blanke, Mogens Automation and Control Group Dept. of Electrical Engineering Technical University of Denmark Lyngby2800 Kgs. Denmark AMOS CoE Institute for Technical Cybernetics Norwegian University of Science and Technology Trondheim7491 Norway

ISBN: (纸本)9783902823625

In safety critical systems, the control system is composed of a core control system with a fault detection and isolation scheme together with a repair or a recovery strategy. The time that it takes to detect, isolate, and recover from the fault (fault recovery time) is a critical factor in safety of a system. It must be guaranteed that the trajectory of a system subject to fault remains in the region of attraction (ROA) of the post-fault system during this time. This paper proposes a new algorithm to compute the critical fault recovery time for nonlinear systems with polynomial vector fields using sum of squares programming. The proposed algorithm is based on computation of ROA of the recovered system and finite-time stability of the faulty system. © IFAC.

关键词： Fault detection

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Active fault isolation in MIMO systems 19

Active fault isolation in MIMO systems

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

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

ISBN: (纸本)9783902823625

Active fault isolation of parametric faults in closed-loop MIMO systems are considered in this paper. The fault isolation consists of two steps. The first step is group-wise fault isolation. Here, a group of faults is isolated from other possible faults in the system. The group-wise fault isolation is based directly on the input/output signals applied for the fault detection. It is guaranteed that the fault group includes the fault that had occurred in the system. The second step is individual fault isolation in the fault group. Both types of isolation are obtained by applying dedicated auxiliary inputs and the associated residual outputs. © IFAC.

关键词： Fault detection

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Virtual instruments for humidity and temperature measurements

Virtual instruments for humidity and temperature measurement...

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International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Nedyu Nedev Zvezditza Nenova Stefan Ivanov Dept. of Fundamentals of Electrical and Power Engineering Technical University of Gabrovo Gabrovo Bulgaria Dept. of Automation Information and Control Systems Technical University of Gabrovo Gabrovo Bulgaria

Virtual instrumentation is used increasingly along with traditional measurement devices. They allow measurement and control of various parameters, simulated testing of models of real processes and provide convenient user interface by giving an opportunity to build an Internet-based virtual laboratories. This paper presents the results of the development of a computer-based system for data acquisition and LabVIEW virtual instruments for measuring humidity and temperature, enabling the creation of Internet-based virtual laboratories. This virtual instrumentation makes possible both remote measurement of humidity and temperature and training outside educational laboratories. The proposed approach allows remote conducting of real experiments and makes it possible to use virtual instruments in the field of training engineering students where it is essential to have practice hours.

关键词： Instruments Humidity measurement Temperature measurement Universal Serial Bus Switches Laboratories Temperature sensors

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Intra-plant reactive power-voltage control: Practices, drawbacks and challenges

Intra-plant reactive power-voltage control: Practices, drawb...

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IEEE General Meeting Power& Energy Society

作者： Jasna Dragosavac Žarko Janda Dušan Arnautović Selma Awadallah J. V. Milanović Automation and Control Dept. Electrical Engineering Institute “Nikola Tesla” Belgrade Serbia School of Electrical and Electronic Engineering The University of Manchester Manchester UK

The paper discusses reactive power-voltage (Q-V) control in a multi-machine steam power plant (SPP). After briefly introducing some of the basic characteristics of synchronous generator's voltage control through automatic voltage regulators, the practices of widely applied manual voltage references setting for Q-V control in SPP is illustrated through several examples of SPP response recorded at site. Further the case studies were developed with the emphasis on the drawbacks of manual intra-plant Q-V control by building a mathematical model of realistic SPP in Matlab-Simulink. Relying on noticed drawbacks the paper highlights the requirements for enhancing SPP reactive power response and voltage support to the power system by coordinated Q-V control at power plant level. Finally, the paper illustrates the achieved performances of coordinated Q-V controller in real SPP.

关键词： Reactive power Power generation Solids Power system stability Generators Automatic voltage control

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Stabiliser Fault Emergency control using Reconfiguration to Preserve Power System Stability

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IFAC Proceedings Volumes 2014年第3期47卷 9093-9098页

作者： Andreas S. Pedersen Jan H. Richter Mojtaba Tabatabaeipour Hjörtur Jóhannsson Mogens Blanke Automation and Control Group at Dept. of Electrical Engineering Centre for Electric Power and Energy at Dept. of Electrical Engineering Technical University of Denmark 2800 Kgs. Lyngby Denmark Siemens AG Industry Sector Gleiwitzer Str. 555 90475 Nürnberg Germany

关键词： Power-system stabilisers Fault-tolerant systems Absolute stability

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controller Modification Applied for Active Fault Detection

Controller Modification Applied for Active Fault Detection

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American control Conference

作者： Henrik Niemann Jakob Stoustrup Niels Kjolstad Poulsen Dept. of Electrical Engineering Automation and Control Tech. University of Denmark DK-2800 Kgs. Lyngby Denmark Dept. of Electronic Systems Automation & Control Aalborg University DK-9220 Aalborg Denmark Dept. of Applied Mathematics and Computer Science Tech. University of Denmark DK-2800 Kgs. Lyngby Denmark

ISBN: (纸本)9781479932757

This paper is focusing on active fault detection (AFD) for parametric faults in closed-loop systems. This auxiliary input applied for the fault detection will also disturb the external output and consequently reduce the performance of the controller. Therefore, only small auxiliary inputs are used with the result that the detection and isolation time can be long. In this paper it will be shown, that this problem can be handled by using a modification of the feedback controller. By applying the YJBK-parameterization (after Youla, Jabr, Bongiorno and Kucera) for the controller, it is possible to modify the feedback controller with a minor effect on the external output in the fault free case. Further, in the faulty case, the signature of the auxiliary input can be optimized. This is obtained by using a band-pass filter for the YJBK parameter that is only effective in a small frequency range where the frequency for the auxiliary input is selected. This gives that it is possible to apply an auxiliary input with a reduced amplitude. An example is included to show the results.

关键词： Active fault detection parametric faults feedback controllers YJBK parameterization controller modification

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Indirect position estimation method for switched reluctance motor using searching windings

Indirect position estimation method for switched reluctance ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Cheng Wang Zhiquan Deng Jun Cai Rongguang Hu College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China School of Information and Control Nanjing University of Information Science and Technology Nanjing China Dept. Automatic Control and System Engineering University of Sheffield UK

This paper presents a new method to estimate rotor position indirectly for 12/8 switched reluctance motor (SRM). In this method, searching windings and main windings are wound on stator together. The structure of searching windings is designed to reduce induced voltages caused by main windings. High frequency voltage is applied to searching windings and the position signal is derived from induced high frequency signals. High frequency voltage can be injected from standstill to high speed in this method, thus it can operate in a wide speed range. The proposed method is implemented on a 12/8 SRM and the experimental results demonstrate the validity of this method.

关键词： Windings Reluctance motors Rotors Inductance Estimation Coils

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Calculation of Critical Fault Recovery Time for Nonlinear Systems based on Region of Attraction Analysis 1

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IFAC Proceedings Volumes 2014年第3期47卷 6741-6746页

作者： S. Mojtaba Tabatabaeipour Mogens Blanke Automation and Control Group Dept. of Electrical Engineering Technical University of Denmark 2800 Kgs. Lyngby Denmark AMOS CoE at Institute for Technical Cybernetics Norwegian University of Science and Technology 7491 Trondheim Norway

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