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The 24th Chinese control and decision Conference (第24届中国控制与决策学术年会 2012 CCDC)

作者： Jingjing Zheng Yan Li Baodong Liu YangQuan Chen School of Mathematics Shandong UniversityJinan Shandong 250061 School of Control Science andEngineering Shandong University Jinan Shandong 250061 P. R. China Software College Shandong University JinanShandong 250061 Center for Self-Organizing and Intelligent Systems (CSOIS) Electrical and Computer Engineering Depa

In this paper, the Lp stability of the *** function with two parameters times a power law function tγ-1Eα,β(-λta) is discussed on the *** time interval. The necessary and *** conditions of Lp stability are derived, which show that the discussed function is a continuous intermediate process connecting the exponential, power law and *** functions. A number of examples about the fractional order Lyapunov method and fractional order systems are illustrated to validate the concepts.

关键词： Fractional calculus Mittag-Leffler function Lp stability power law.

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Dead-Time Compensation in Model Predictive Instantaneous-current control

Dead-Time Compensation in Model Predictive Instantaneous-cur...

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Annual Conference on IEEE Industrial Electronics Society

作者： Akihiro Imura Tomoya Takahashi Masami Fujitsuna Tadanao Zanma Shinji Doki Engineering Research & Development Center DENSO CORPORATION Division of Artificial Systems Science Graduate School of Engineering Chiba University Department of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University

ISBN: (纸本)9781467324199

Model predictive instantaneous-current control (MPIC), which was proposed in our earlier works, enables us to achieve better instantaneous current control using mathematical models of an inverter and permanent magnet synchronous motors (PMSM). However, the dead-time to avoid the short breakdown in the inverter is the main reason in the modeling error. If the modeling error is not ignorable, it is not possible to predict the current evolution using the model. Thus, in this paper, we analyze the influence of the dead-time in MPIC and propose a compensation technique for the dead-time so that the error of the predicted current is reduced. The effectiveness of the proposed method is verified through simulation and experiments.

关键词： Analytical models Predictive models Rotors Switches Inverters

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Integrating STATCOM and battery energy storage system for power system transient stability: A review and application

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Advances in Power Electronics 2012年第1期2012卷

作者： Chakraborty, Arindam Musunuri, Shravana K. Srivastava, Anurag K. Kondabathini, Anil K. Philips Electronics NA Chicago IL 60656 United States Control System Division Eaton Technologies Pune 411014 India School of Electrical Engineering and Computer Science Washington State University Pullman WA 99163 United States ABB Inc. Raleigh NC 27606 United States

Integration of STATCOM with energy storage devices plays an imperative role in improving the power system operation and control. Significant research has been done in this area for practical realization of benefits of the integration. This paper, however, pays particular importance to the performance improvement for the transients as is achievable by STATCOM with battery-powered storage systems. Application of STATCOM with storage in regard to intermittent renewable energy sources such as wind power generation is also discussed in the paper. At the beginning of this paper, an overall review of the STATCOM and energy storage systems are elaborated. A brief overview of the advantages of using STATCOM in conjunction to energy storage systems in achieving power system stability is presented. In the second part of the paper, a typical transient stability model of a STATCOM is presented. The dynamics of real and reactive power responses of the integrated system to transients is studied. The study is aimed at showing that the combination of STATCOM and battery energy storage significantly improves the performance of the system. The final results show that the STATCOM reactive power/voltage control helps in transient stability enhancement. © 2012 Arindam Chakraborty et al.

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Evasive decision making in uninhabited maritime vehicles

Evasive decision making in uninhabited maritime vehicles

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作者： Naeem, Wasif Irwin, George W. Intelligent Systems and Control School of Electronics Electrical Engineering and Computer Science Queen's University Belfast Belfast BT9 5AH United Kingdom

ISBN: (纸本)9783902661937

Unmanned surface vehicles (USVs) are able to navigate in hazardous environments without jeopardising human life. In order to eliminate the human factor altogether, a reliable onboard collision detection and avoidance system is mandatory. This would improve a vessel's self reliance and aid in accomplishing complex missions for extended periods. In addition, the evasive manoeuvres are required to be compliant with coastguard regulations (COLREGs) defined by the International Maritime Organisation. This paper reports the preliminary investigation of such collision avoidance manoeuvres by employing a biased waypoint guidance scheme and genetic algorithms. The paper deals with reactive collision avoidance for objects in the near field. In addition, the dynamics of a USV called Springer is incorporated which provides a realistic setting for the proposed strategies. Simulation results demonstrate that the adopted schemes are able to generate safe and viable reference trajectories. © 2011 IFAC.

关键词： Genetic algorithms

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Blind Identification of Wiener Models *

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IFAC Proceedings Volumes 2011年第1期44卷 5597-5602页

作者： Adrian Wills Thomas B. Schön Lennart Ljung Brett Ninness School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Division of Automatic Control Linköping University SE-581 83 Linköping Sweden

Abstract This paper develops and illustrates methods for the identification of Wiener model structures. These techniques are capable of accommodating the “blind” situation where the input excitation to the linear block is not observed. Furthermore, the algorithm developed here can accommodate a nonlinearity which need not be invertible, and may also be multivariable. Central to these developments is the employment of the Expectation Maximisation (EM) method for computing maximum likelihood estimates, and the use of a new approach to particle smoothing to efficiently compute stochastic expectations in the presence of nonlinearities.

关键词： Wiener Model Nonlinear systems Maximum Likelihood System Identification Parameter Estimation

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Input design for nonlinear stochastic dynamic systems - A particle filter approach

Input design for nonlinear stochastic dynamic systems - A pa...

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作者： Gopaluni, R. Bhushan Schön, Thomas B. Wills, Adrian G. Department of Chemical and Biological Engineering University of British Columbia Vancouver V6T 1Z3 Canada Division of Automatic Control Linköping University SE-581 83 Linköping Sweden School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia

ISBN: (纸本)9783902661937

We propose an algorithm for optimal input design in nonlinear stochastic dynamic systems. The approach relies on minimizing a function of the covariance of the parameter estimates of the system with respect to the input. The covariance matrix is approximated using a joint likelihood function of hidden states and measurements, and a combination of state filters and smoothers. The input is parametrized using an autoregressive model. The proposed approach is illustrated through a simulation example. © 2011 IFAC.

关键词： Covariance matrix

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LCL filter design and control for grid-connected PWM converter

LCL filter design and control for grid-connected PWM convert...

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International Conference on Power Electronics (ICPE)

作者： Byung-Geuk Cho Seung-Ki Sul Hyunjae Yoo Seung-Min Lee School of Electrical Engineering & Computer Science Seoul National University Seoul South Korea Power & Control Systems Division SAMSUNG HEAVY INDUSTRIES Company Limited Hwasung Gyeonggi South Korea

This paper describes LCL filter design and control for grid-connected PWM converter. To attenuate switching harmonics on grid side with an LCL filter, cost effectiveness must be considered to select filter parameters. This paper proposes a filter design method based on a computer simulation tool. Depending on user's optimal cost function, filter parameters are chosen without tedious and repetitive mathematical calculations. On the other hand, damping factors must be introduced in control of LCL filter to suppress the inherent resonant characteristics. Since the resonance phenomenon is minimized by increasing the ratio of switching frequency to fundamental grid frequency in most conventional researches, it is difficult to be employed in high power system due to the limited switching frequency of power semiconductors in the converter. In this paper, a novel current controller with generalized gain determination is suggested. Discrete time controller based on only grid voltages and currents information is introduced, which yields desirable dynamic response even in lower switching frequency of PWM converter. Simulations and experimental results are presented to validate the proposed design and control procedures.

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Evasive decision Making in Uninhabited Maritime Vehicles

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IFAC Proceedings Volumes 2011年第1期44卷 12833-12838页

作者： Wasif Naeem George W. Irwin Intelligent Systems and Control School of Electronics Electrical Engineering and Computer Science Queen's University Belfast Belfast BT9 5AH UK (Tel: 44-289097-4066)

Abstract Unmanned surface vehicles (USVs) are able to navigate in hazardous environments without jeopardising human life. In order to eliminate the human factor altogether, a reliable onboard collision detection and avoidance system is mandatory. This would improve a vessel's self reliance and aid in accomplishing complex missions for extended periods. In addition, the evasive manoeuvres are required to be compliant with coastguard regulations (COLREGs) defined by the International Maritime Organisation. This paper reports the preliminary investigation of such collision avoidance manoeuvres by employing a biased waypoint guidance scheme and genetic algorithms. The paper deals with reactive collision avoidance for objects in the near field. In addition, the dynamics of a USV called Springer is incorporated which provides a realistic setting for the proposed strategies. Simulation results demonstrate that the adopted schemes are able to generate safe and viable reference trajectories.

关键词： Unmanned surface vehicles guidance and control collision avoidance COLREGs genetic algorithms

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Distributed Output Regulation of Uncertain and Switching Multi-Agent systems via Internal Model Design

Distributed Output Regulation of Uncertain and Switching Mul...

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2011 China control and decision Conference(2011中国控制与决策会议 CCDC)

作者： Xiaoli Wang Yiguang Hong Zhong-Ping Jiang School of Information Science and Engineering Harbin Institute of Technology atWeihaiWeihai 264209 Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy o Department of Electrical and Computer Engineering Polytechnic Institute of New York University Six

In this paper, the distributed robust output regulation problem of linear multi-agent systems (MAS) is considered. The driving force from the active leaders or the environmental disturbances is formulated as an input of an exogenous system (or exosystem) of the considered multi-agent networks. A systematic distributed design approach is proposed to handle output regulation via dynamic output feedback with the help of canonical internal model (IM). With common solutions of regulator equations and Lyapunov functions, the distributed robust output regulation with switching interconnection topology is designed to achieve collective aims.

关键词： Output regulation Multi-agent systems Internal Model Switching Topology

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Compressive System Identification of LTI and LTV ARX Models

Compressive System Identification of LTI and LTV ARX Models

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IEEE Conference on decision and control

作者： Borhan M. Sanandaji Tyrone L. Vincent Michael B. Wakin Roland Toth Kameshwar Poolla Department of Electrical Engineering and Computer Science Colorado School of Mines Golden CO 80401 USA Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands Departments of Electrical Engineering and Computer Sciences and Mechanical Engineering University of California Berkeley CA 94720 USA

ISBN: (纸本)9781612848006

In this paper, we consider identifying Auto Regressive with eXternal input (ARX) models for both Linear Time-Invariant (LTI) and Linear Time-Variant (LTV) systems. We aim at doing the identification from the smallest possible number of observations. This is inspired by the field of Compressive Sensing (CS), and for this reason, we call this problem Compressive System Identification (CSI). In the case of LTI ARX systems, a system with a large number of inputs and unknown input delays on each channel can require a model structure with a large number of parameters, unless input delay estimation is performed. Since the complexity of input delay estimation increases exponentially in the number of inputs, this can be difficult for high dimensional systems. We show that in cases where the LTI system has possibly many inputs with different unknown delays, simultaneous ARX identification and input delay estimation is possible from few observations, even though this leaves an apparently ill-conditioned identification problem. We discuss identification guarantees and support our proposed method with simulations. We also consider identifying LTV ARX models. In particular, we consider systems with parameters that change only at a few time instants in a piecewise-constant manner where neither the change moments nor the number of changes is known a priori. The main technical novelty of our approach is in casting the identification problem as recovery of a block-sparse signal from an underdetermined set of linear equations. We suggest a random sampling approach for LTV identification, address the issue of identifiability and again support our approach with illustrative simulations.

关键词： LTI System identification delay estimation Mathematic Identifiability Model structures

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