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Power System Load-Frequency Controller Design Based on discrete Variable Structure Control theory

Power System Load-Frequency Controller Design Based on Discr...

引用

第六届IEEE国际电力电子与运动控制会议 (2009 IEEE 6th international Power Electronics and Motion Control conference-ECCE Asia

作者： Guangwei Meng Hao Xiong Huaishu Li Department of Electrical Engineering Naval University of EngineeringWuhan430033China

this paper proposes a discrete-time variable structure reaching law with attenuating quasi-sliding mode band, and gives the variable condition of quasi-sliding mode band. the proposed reaching law is applied to design a load-frequency controller for a power system. the simulation results show that the controller can not only eliminate system chattering, but also improve dynamic performance of the system effectively and make the system possess a strong robustness property.

关键词： Power system control Power systems Control systems Control theory Sliding mode control Power system dynamics Robust control Power system simulation Equations Electric variables control

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A dynamic CVaR-portfolio approach using real options: An application to energy investments

A dynamic CVaR-portfolio approach using real options: An app...

引用

international conference on European Electricity Market, EEM

作者： Jana Szolgayova Sabine Fuss Nikolay Khabarov Michael Obersteiner Department of Applied Mathematics and Statistics Faculty of Mathematics Physics and Informatics Comenius University Slovakia International Institute for Applied Systems Analysis Laxenburg Austria

Even though portfolio theory has increasingly been applied to analyze large-scale investments under uncertainty - and especially so in the electricity sector-most analysis so far has been based on the static mean-variance approach, which has two shortcomings: it fails to take into account irreversibility in the form of high sunk costs and the associated implications for optimal dynamic behavior. In addition, variance is not always the ideal risk measure, given that return or cost distributions are not necessarily normal. In fact, if losses are potentially large, a risk measure taking into account fat tails should be adopted. In this paper we generate distributions by optimizing investment behavior in a real options model, thus considering uncertainty and irreversibility at the plant level, and use them in a dynamic portfolio model, where the conditional value-at- risk (CVaR) is the risk measure. More specifically, we look at the dynamics of the optimal technology mix over a future time period conditional on the initial distribution of technologies. the application to investment in the electricity sector with uncertain climate change policy shows that this approach is not only useful from the aggregate investment point-of-view, but also for the purpose of assessing of policy effects.

关键词： Investments Portfolios Uncertainty Failure analysis Fossil fuels mathematics Costs Power generation Statistical analysis Physics

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Graph-based k-means clustering: A comparison of the set median versus the generalized median graph

引用

13th international conference on Computer Analysis of Images and Patterns, CAIP 2009

作者： Ferrer, M. Valveny, E. Serratosa, F. Bardají, I. Bunke, H. Institut de Robòtica i Informàtica Industrial CSIC-UPC C. Llorens Artigas 4-6 Barcelona 08028 Spain Centre de Visió per Computador Universitat Autònoma de Barcelona Edifici O Campus UAB Bellaterra 08193 Spain Departament d'Informàtica i Matemàtiques Universitat Rovira i Virgili Av. Països Catalans 26 43007 Tarragona Spain Institute of Computer Science and Applied Mathematics University of Bern Neubrückstrasse 10 CH-3012 Bern Switzerland

ISBN: (纸本)3642037666

In this paper we propose the application of the generalized median graph in a graph-based k-means clustering algorithm. In the graph-based k-means algorithm, the centers of the clusters have been traditionally represented using the set median graph. We propose an approximate method for the generalized median graph computation that allows to use it to represent the centers of the clusters. Experiments on three databases show that using the generalized median graph as the clusters representative yields better results than the set median graph. © 2009 Springer Berlin Heidelberg.

关键词： Clustering algorithms

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Design and implementation of image compression core based on CCSDS algorithm

Design and implementation of image compression core based on...

引用

international conference on Computer Science & Education (ICCSE)

作者： Xiaodong Gu Huaichao Wang Xuequan Zhang Shijun Xu Chinese Academy of Sciences Center for Space Science and Applied Research Beijing China Department of Mathematics and Physics Xi'an Technological University Xi'an China

Image compression is one of the major services in space flight mission and remote sensing system. this paper presents a high speed and high performance image compressor for future spacecrafts and micro-satellites. the proposed compression core is based on a modified CCSDS algorithm and the processing speed is improved 40 times using parallel architecture and pipeline technique. the experimental results indicate that this core has high performance at coding efficiency, data rate and error containment. A data rate of about 12.5 Mpixels/s can be sustained at 50 MHz.

关键词： Algorithm design and analysis Image coding discrete wavelet transforms Hardware Partitioning algorithms Decorrelation Space missions Space vehicles Pipelines Field programmable gate arrays

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Robust 2D Fisher Barycenter Contour

Robust 2D Fisher Barycenter Contour

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international conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Kosorl thourn Yuttana Kitjaidure Shozo Kondo Department of Electronics Faculty of Engineering King Mongkut's Institute of Technology Bangkok Thailand Department of Information and Telecommunication Engineering Tokai University Japan

In this paper, the algorithm for 2D shape matching and retrieval is developed by using Fisher Barycenter Contour (FBcC). First, the shape is represented into 3D format using the signed enclosed area at each scale level of Barycenter Contour (BcC). Because of high dimension of the feature representation, the eigen Barycenter Contour (EBcC) is applied for dimensionality reduction. then, the Fisher Barycenter Contour (FBcC) is used for making discrimination. Finally, the similarity is measured using the normalized cross correlation. the experimentation is tested on MPEG-7 contour shape database CE-1 part B of 1400 image shapes. the experimental results illustrate that our approach gives very high retrieval efficiency (or Bulls-eye test) of 89.60% and 98.62% using two parameters, shape signature and its power spectrum respectively, when comparing with all the existing methods.

关键词： Robustness Principal component analysis Shape measurement Testing Cascading style sheets Information retrieval Spatial databases discrete Fourier transforms MPEG 7 Standard Image databases

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Power System Load-Frequency Controller Design Based on discrete Variable Structure Control theory

Power System Load-Frequency Controller Design Based on Discr...

引用

2009 IEEE 6th international Power Electronics and Motion Control conference-ECCE Asia

作者： Guangwei Meng, Hao Xiong, Huaishu Li Department of Electrical Engineering, Naval University of Engineering, Wuhan, 430033, China

关键词： Power System Load-Frequency Controller Design Based on discrete Variable Structure Control theory Controller

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Abstractions in process mining: A taxonomy of patterns

Abstractions in process mining: A taxonomy of patterns

引用

7th international conference on Business Process Management, BPM 2009

作者： Jagadeesh Chandra Bose, R.P. Van Der Aalst, Wil M. P. Department of Mathematics and Computer Science University of Technology Eindhoven Netherlands Philips Healthcare Veenpluis 5-6 Best Netherlands

ISBN: (纸本)3642038476

Process mining refers to the extraction of process models from event logs. Real-life processes tend to be less structured and more flexible. Traditional process mining algorithms have problems dealing with such unstructured processes and generate spaghetti-like process models that are hard to comprehend. One reason for such a result can be attributed to constructing process models from raw traces without due pre-processing. In an event log, there can be instances where the system is subjected to similar execution patterns/behavior. Discovery of common patterns of invocation of activities in traces (beyond the immediate succession relation) can help in improving the discovery of process models and can assist in defining the conceptual relationship between the tasks/activities. In this paper, we characterize and explore the manifestation of commonly used process model constructs in the event log and adopt pattern definitions that capture these manifestations, and propose a means to form abstractions over these patterns. We also propose an iterative method of transformation of traces which can be applied as a pre-processing step for most of today's process mining techniques. the proposed approaches are shown to identify promising patterns and conceptually-valid abstractions on a real-life log. the patterns discussed in this paper have multiple applications such as trace clustering, fault diagnosis/anomaly detection besides being an enabler for hierarchical process discovery. © 2009 Springer Berlin Heidelberg.

关键词： Iterative methods

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Trajectory enabled service support platform for mobile users' behavior pattern mining

Trajectory enabled service support platform for mobile users...

引用

international conference on Mobile and Ubiquitous Systems: Networking and Services (MobiQuitous)

作者： Yanfeng Zhu Yibo Zhang Weixiong Shang Jin Zhou Chun Ying IBM China Research Laboratory China

Existing operational support systems of GSM service providers focus on collecting and maintaining massive rough cell-ID based location data, which cannot satisfy the requirement of new trajectory based services in identifying the behaviors of mobile users. In this paper, we introduce a trajectory enabled service support platform to convert the location data into limited meaningful mobile user's behavior patterns, which benefit the trajectory based services by simplifying the behavior detection. the core technologies of the platform are the pattern selection, which requires to cover the information included in the raw location data as more as possible, and the run-time mining algorithm, which requires less storage space. We propose a new concept, transient entropy, to identify the moving speed of users, and based on which we define and mine four types of behavior patterns: frequent locations, frequent trajectory, meaningful location, and moving mode. By analyzing the sojourn distribution, we find that the sojourn time in each location follows a Zipf distribution, based on which we present a run-time algorithm to mine the behavior patterns with less storage space. A realistic experiments is given to validate the proposed platform and algorithms.

关键词： Wireless sensor networks Monitoring Shape Fires Wireless communication Distributed computing Medical services discrete event simulation Microelectronics Communications technology

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A New Approach in discrete Chaos System Control by Differential Evolution Algorithm

A New Approach in Discrete Chaos System Control by Different...

引用

6th IEEE international conference on Industrial Informatics

作者： Gao, Fei Lee, Ju-Jang Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Taejon 305701 South Korea

ISBN: (纸本)9781424421701

In this paper, a novel chaos control approach by differential evolution (DE) Algorithm is proposed to control the inherent chaotic phenomenon in genetic algorithms. Firstly the new approach detects the dynamical behaviors of a new discrete chaos system with rational fraction in GA such as the extreme values and unstable periodic points. Secondly it directs the chaotic system to its unstable fix point from any initial point by global controlling factors {U(k)} solved self-adaptively by DE. thirdly it proposes a multi-model solution for chaos control through DE to stabilize the system on its unstable fix point. Simulation results are further presented to show the effectiveness and performance of the put method.

关键词： Chaotic systems

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Operation Analysis of Headend Process Facility Using discrete Event Simulation

Operation Analysis of Headend Process Facility Using Discret...

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6th IEEE international conference on Industrial Informatics

作者： Lee, Hyo Jik Kim, Sung Hyun Park, Hee Sung Choi, Chang Hwan Yoon, Ji Sup Park, Byung Suk Korea Atom Energy Res Inst Taejon South Korea

ISBN: (纸本)9781424421701

this paper aims to introduce a facility operation modeling and simulation mainly based on a discrete event system modeling scheme. Recently, facilities have become so much complex that its operational status cannot be estimated by simple calculations. A facility can consist of a lot of unit process and a lot of transportation between consecutive processes, which may be modelled as a time driven system or an event driven system. However, the transportation between processes can usually be considered as a discrete event system and not a continuous system. therefore, in macro-scale, a facility operation can be simulated on the basis of a discrete event system modeling if we do not consider how an individual process behaves. this study introduces the current status of the studies on an operation modeling and simulation regarding typical nuclear facilities along with some instances. Also, this paper provides insights about how a discrete event system can be applied to a nuclear facility. these kinds of modeling and simulation are very important because they can contribute to a facility design in terms of an optimal process and an equipment layout, a generic understanding for regulators, stakeholders and operators, a system diagnosis through by comparing measurement data with simulation results and furthermore it can contribute to an efficient operation scheduling.

关键词： discrete event simulation

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