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RECURRENCE PLOT BASED STUDY OF DIRECT TORQUE CONTROLLED INDUCTION MACHINES

IFAC Proceedings Volumes 2006年第8期39卷 101-106页

作者： Zoltán Süto István Nagy Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldmann Györgytér 3. V2. 533. 1111 Budapest Hungary phone: (36-1) 463-1165 fax: (36-1) 463-3163 Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

The strange behavior of Direct Torque Controlled (DTC) Induction Machine (IM) due to nonlinearity is studied. The nonlinearity is the result of hysteresis comparators. Recurrence Plots (RP) beside the bifurcation diagram are applied to reveal the possible states of the system such as periodic, subharmonic and chaotic states. RP makes it possible to identify various system states without the knowledge of all state variables in a multi-dimensional system, it is enough to acquire only time series of an observable state.

关键词： Nonlinear Systems Chaos Variable-structure Systems Torque Control Induction Machines

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Water resources assessment in the Huai River basin: Hydrological modelling and remote sensing

Water resources assessment in the Huai River basin: Hydrolog...

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2005 Dragon Symposium - Dragon Programme Mid-Term Results

作者： Baubion, Charles De Marsily, Ghislain Jiren, Li Jingfeng, Xin Shifeng, Huang Center for Computing Geology UMR Sisyphe Paris School of Mines 35 rue Ste-Honoré 77305 Fontainebleau France Sino-French Joint Laboratory in Informatics Automatics and Applied Mathematics Institute of Automation Chinese Academy of Sciences PO Box 2728 100080 Beijing China Laboratory of Applied Geology University Paris VI UMR Sisyphe Case 105 4 Place Jussieu 75252 Paris Cedex 05 France Remote Sensing Technology Application Center Institute of Water Resources and Hydropower Research Ministry of Water Resources No.20 West Road Chegongzhuang 100044 Beijing China

ISBN: (纸本)9290929227

The Huai River basin, in China is subjected to strong human pressure, and is geographically, meteorologically, and therefore hydrologically, very heterogeneous;it faces severe water management problems, concerning flooding and irrigation in particular. The Chinese local authorities are responsible for the management of the basin and the design of the infrastructure;a comprehensive water resources assessment using remote sensing technology and integrated hydrological modelling could be a great help to find long term solutions to the pending problems. In this paper, an attempt at developing such a complete water resources assessment is proposed, focusing first on a sub-catchment, the Shiguanhe watershed, which is well representative of the heterogeneity of the whole Huai river basin. The tools for this assessment are described here, both in hydrological modeling and in remote sensing. Meanwhile, a first attempt at modelling the Shiguanhe basin will help to define future developments that would allow these tools to be adapted to the Huai River basin and its complex hydraulic system, including many dams and irrigation channels. For this purpose, the MODCOU model was used;it is a distributed hydrological model using a conceptual reservoir-based approach. The processing of a digital elevation model first serves as a basis to build the structure that MODCOU needs;the model is then run with basic land-use and meteorological data, which might later be made more accurate through remote sensing data processing. A new function was developed within the MODCOU model to take the large artificial reservoirs into account. The first results provided a reasonable agreement between the measured and calculated flow at the outlet of the basin, and also showed the attention that has to be paid to the complex irrigation system, and to additional improvements that are required to accurately model such a complex system.

关键词： Water resources

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Power Factor Correction and Compensation of Unbalanced Loads by PWM DC/AC Converters

Power Factor Correction and Compensation of Unbalanced Loads...

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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Rafael K. Jardan Istvan Nagy Tamas Ruzsanyi Hiroyuki Ohsaki Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Ganz Transelektro Traction Electrics Company Limited Budapest Hungary Department of Advanced Energy Division of Transdisciplinary Sciences Graduate School of Frontier Sciences University of Tokyo Bunkyo Tokyo Japan

A solution developed for power quality conditioning (PQC) applied in distributed generation system is presented. The method is exploiting the capabilities of the DC/AC converter of a system that has been developed to generate electric power by utilizing alternative, renewable and waste energies. The power quality conditioning is based on the application of space vector theory, using an algorithm easy to implement. The paper describes a control structure that is capable of both power factor correction and elimination of negative sequence components in the mains current. The theoretical analysis is confirmed by computer simulation results

关键词： Power factor correction Pulse width modulation Pulse width modulation converters Analog-digital conversion Power quality Distributed control AC generators DC generators Power generation Application software

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Executing real-time constrained control applications modelled in IEC 61499 with respect to dynamic reconfiguration

Executing real-time constrained control applications modelle...

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2005 3rd IEEE International Conference on Industrial informatics, INDIN

作者： Zoitl, Alois Grabmair, Gunnar Auinger, Franz Sünder, Christoph Automation Control Institute Vienna University of Technology Austria Depart. for Industrial Informatics FH Upper Austria - University of Applied Sciences Wels Austria

ISBN: (纸本)0780390946

New fast moving markets demand flexible, adaptable production facilities to allow manufacturing companies a fast reaction on consumer needs. Reconfigurable manufacturing systems provide a solution for these problems. Currently used software architectures have not been designed for providing an infrastructure for such manufacturing systems. With the new standard IEC 61499 the International Electrotechnical Commission provides an architecture for flexible distributed control systems. But it leaves open points regarding real-time execution and reconfiguration in real-time. This work focuses on real-time execution of IEC 61499 applications. It describes all execution elements of IEC 61499 within a device. Different implementation and scheduling approaches are compared and discussed. A first real-time scheduling approach for IEC 61499 control applications allows executing applications with periodic real-time constraints in parallel to unconstrained applications. It serves as a base for an enhanced full featured IEC 61499 real-time execution support © 2005 IEEE.

关键词： Distributed parameter control systems

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Power quality conditioning based on space vector transformation

Power quality conditioning based on space vector transformat...

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IEEE International Symposium on Industrial Electronics 2005, ISIE 2005

作者： Nagy, István Járdán, Rafael K. IEEE Budapest University of Technology and Economics Department of Automation and Applied Informatics Budafoki 8 H-1111 Budapest Hungary Computer and Automation Institute Hungarian Academy of Science Kende 13-17 H-111 Budapest Hungary

ISBN: (纸本)0780387384

The paper presents a novel solution for Power Quality Conditioning exploiting the capabilities of the DC/AC converter of a system that has been developed to generate electric power by utilizing alternative, renewable and waste energies, pointing out that the solution can also be applied in other fields of power electronic energy conversion. The solution of Power Quality Conditioning is based on the application of space vector theory, using an algorithm easy to implement. The theoretical analysis is confirmed by computer simulation results. © 2005 IEEE.

关键词： Electric power generation

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Resonant boost converter operating above its resonant frequency

Resonant boost converter operating above its resonant freque...

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2005 European Conference on Power Electronics and Applications

作者： Buti, Balázs Bartal, Péter Nagy, István IEEE Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldmann György tér 3 H-1111 Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9075815085

The paper contains an investigation of the high frequency operation of a dual channel resonant Boost converter. The energy is transmitted through the two channels of the converter from its input to the output using a switched capacitor. Because of the two channels the load of the converter elements is distributed therefore its application is recommended in the medium or higher power ranges. An advantage of the converter is that in discontinuous current conduction mode (DCM) it can work in soft-switched mode too. A drawback of DCM operation is the higher output voltage ripple and the unfavorable utilization of the power handling capabilities of its components compared to the continuous current conduction (CCM) operation. The paper presents the conditions of operating the converter above the resonant frequency of its inherent L-C ringing circuit, and represents its beneficial effects. The considerations are verified by simulation results.

关键词： Electric converters

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Resonant boost converter operating above its resonant frequency

Resonant boost converter operating above its resonant freque...

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European Conference on Power Electronics and Applications

作者： B. Buti P. Bartal I. Nagy Department of Automation And Applied Informatics University of Technology and Economics Budapest Hungary Computer and Automation Research Institute of The Hungarian Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper contains an investigation of the high frequency operation of a dual channel resonant boost converter. The energy is transmitted through the two channels of the converter from its input to the output using a switched capacitor. Because of the two channels the load of the converter elements is distributed therefore its application is recommended in the medium or higher power ranges. An advantage of the converter is that in discontinuous current conduction mode (DCM) it can work in soft-switched mode too. A drawback of DCM operation is the higher output voltage ripple and the unfavorable utilization of the power handling capabilities of its components compared to the continuous current conduction (CCM) operation. The paper presents the conditions of operating the converter above the resonant frequency of its inherent L-C ringing circuit, and represents its beneficial effects. The considerations are verified by simulation results

关键词： Resonance Resonant frequency Switching converters Capacitors Switching frequency Switches Zero voltage switching automation Uniform resource locators Zero current switching

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New E-learning tools for DC-DC converters

New E-learning tools for DC-DC converters

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2005 European Conference on Power Electronics and Applications

作者： Hamar, J. Funato, H. Ogasawara, S. Nagy, I. Ogasawara and Funato Laboratory Dept. of Electrical and Electronic Engineering Utsunomiya University 7-1-2 Yoto Utsunomiya-shi Tochigi 321-8585 Japan Budapest University of Technology and Economics Department of Automation and Applied Informatics Goldmann György tér 3 H-1111 Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences Hungary

ISBN: (纸本)9075815085

The paper gives an overview of the Yoto project, a novel e-learning initiative to build up an electrical engineering knowledge base. It also presents a new e-module of the project relating to the steady-state operation of dc-dc converters. The multimedia rich module contains numerous interactive tools promoting the high level education in the academy sector and the vocational trainings in the industry. The interactive tools also highly support the circuit design process by enabling fast calculation and access to relevant circuit quantities and waveforms (voltages and currents) in steady-state without long simulations.

关键词： DC-DC converters

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Power quality conditioning based on space vector transformation

Power quality conditioning based on space vector transformat...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： I. Nagy R.K. Jardan Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper presents a novel solution for power quality conditioning exploiting the capabilities of the DC/AC converter of a system that has been developed to generate electric power by utilizing alternative, renewable and waste energies, pointing out that the solution can also be applied in other fields of power electronic energy conversion. The solution of power quality conditioning is based on the application of space vector theory, using an algorithm easy to implement. The theoretical analysis is confirmed by computer simulation results.

关键词： Power quality Power harmonic filters Power generation Voltage Reactive power Circuits Power electronics Power system harmonics Space technology Power generation economics

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Bifurcation phenomena of direct torque controlled induction machines due to discontinuities in the operation

Bifurcation phenomena of direct torque controlled induction ...

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IEEE International Conference on Industrial Technology (ICIT)

作者： Z. Suto I. Nagy Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Hungarian Academy of Sciences Computer and Automation Research Institute Budapest Hungary

The nonlinear behaviour of direct torque controlled (DTC) induction machine (IM) is studied. The nonlinearity is due to the dependence of the switching instants on the state variables. The aim is to derive analytical relations for the determination of the time evolution of state variables and on that basis to reveal the possible states of the system such as periodic, subharmonic and chaotic states

关键词： Bifurcation Torque control Induction machines Stators Voltage Automatic control Space stations automation Electric variables control Couplings

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