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9th International Conference on Knowledge-Based Intelligent Information and engineering systems, KES 2005

作者： Kim, Dongwon Park, Jang-Hyun Seo, Sam-Jun Park, Gwi-Tae Department of Electrical Engineering Korea University 1 5-ka Anam-dong Seongbuk-ku Seoul 136-701 Korea Republic of Department of Control System Engineering Mokpo National University 61 Torim-ri Chonggye-myon Muan-gun Chonnam Korea Republic of Department of Electrical and Electronic Engineering Anyang University 708-113 Anyang 5dong Anyang-shi Kyunggi-do 430-714 Korea Republic of

Modeling of nonlinear static system using neural network based intelligent technology is presented in this paper. The architecture of the intelligent system is combined neural network with polynomial neural network. The composite architecture is designed to get a heuristic approximation method for nonlinear static system modeling. Owing to the approximation capabilities, neural networks have been widely utilized to process modeling, whereas the polynomial neural network is an analysis technique for identifying nonlinear relationships between inputs and outputs of the target system. So the hybrid architecture can harmonize the advantages of the each modeling methodology. Simulation results of the intelligent technology will be shown efficient and good performance. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Nonlinear systems

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Power quality disturbance detection based on mathematical morphology and fractal technique

Power quality disturbance detection based on mathematical mo...

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Li, Gengyin Zhou, Ming Luo, Yan Ni, Yixin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780391144

Based on mathematical morphology and grille fractal, a novel approach on power quality disturbance detection and location is presented in this paper. At first a parallel composite morphological filter with multiple-structure elements is designed to filter the random noise and impulse noise in power quality disturbance signals. Then to the filtered curves, an easy implementation criterion for singularity detection based on the change regularity of grille fractal is proposed to locate the start and end time that disturbance occurs. The voltage sag, swell, harmonic and their combined disturbances are used to verify the validity of the proposed filter-location approach. Numerical results show that the proposed approach is valid and effective. © 2005 IEEE.

关键词： Electric power distribution

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Risk management on long-term electricity purchase allocation in China power markets

Risk management on long-term electricity purchase allocation...

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Sixth International Conference on Power electronics and Drive systems, PEDS 2005

作者： Zhou, Ming Li, Gengyin Nie, Yanli Ni, Yixin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780392965

This paper presents an integrated framework for the optimal management of electricity purchase allocation and risk for load service entities (LSEs). To the practice of China Power Markets, we propose the framework of power portfolio of combined physical forward contract and spot market. The framework suggests that the forward contracts should have different prices on-peak and off-peak in accord with sale prices distinguish on-peak and off-peak. The optimal purchase problem is described by the utility maximum integrated the rate of return and risk tolerance level, and risk is evaluated by Value at Risk (VaR). The analytical solution is also conducted. The numerical results are reasonable with higher rate of return and better risk hedging compared with the corresponding results from the existing portfolio selection approach. The presented framework gives one possible and effective method for the optimal power portfolio and risk management in incomplete power markets. © 2005 IEEE.

关键词： Risk management

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A novel fiber-CAN-based real time communication system for MV-ASD systems

A novel fiber-CAN-based real time communication system for M...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Jue Qian Zhengming Zhao Haitao Zhang Hua Bai Liqiang Yuan Department of Electrical Engineering and Applied Electronic Technology State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

The voltage increment in MV-ASD systems deteriorates the electromagnetic environment, therefore the communication system is facing a formidable challenge in the attempt to achieve the numerous real-time interactivities among those subsystems under such electromagnetic circumstance. This paper focuses on the real-time communication system for the MV-ASD systems, in which electromagnetic compatibility (EMC), real-time performance and system reliability are considered simultaneously. A novel fiber-CAN network is designed and implemented, which remarkably increases EMC compared to the conventional ones. The CAN system that serves in the multiprocessor control system for the MV-ASD system with the rated power of 1 MW is implemented. From the experiment results in the MV-ASD system with a 690 kW motor, it can be verified that the requests of timing performance and the reliability for the communication system are well accomplished

关键词： Optical fiber communication Real time systems control systems Communication system control Circuits Torque control Electromagnetic compatibility Pulse width modulation inverters Optical fiber devices Power system simulation

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Accurate flux observer based on distributed multi-processor in MV adjustable speed drive system

Accurate flux observer based on distributed multi-processor ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Liu Shu Liu Jianzheng Zhao Zhengming Yuan Liqiang Bai Hua Zhang Haitao Department of Electrical Engineering and Applied Electronic Technology State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

This paper presents an accurate flux observer used in distributed multi-processor (DMP) adjustable speed drive systems. The stator flux linkage is estimated with a full-order observer, while the rotor speed is identified by using Lyapunov theorem. In order to improve the system performance in a wide speed range, the stator resistance is estimated simultaneously. In this paper, the structure of the DMP system, the principle of the full-order observer and the method for identifying the rotor speed and state resistance are all described in details. Relevant simulation results based on MATLAB/SIMULINK are given to prove the performance of the method. Experiments of a real system also verify the feasibility of this scheme

关键词： Variable speed drives Stators Observers control systems Mathematical model Couplings Torque control Optimal control Sampling methods Pulse width modulation

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DYNAMIC MODELLING FOR CONDITION MONITORING OF GAS TURBINES: GENETIC ALGORITHMS APPROACH

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IFAC Proceedings Volumes 2005年第1期38卷 739-742页

作者： T.V. Breikin G.G. Kulikov V.Y. Arkov P.J. Fleming Control System Centre School of Electrical and Electronic Engineering University of Manchester Manchester M60 1QD UK Department of Automated Control Systems Ufa State Aviation Technical University K. Marx Street 12 Ufa 450000 Russia Department of Automatic Control & Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD UK

The problem of model-based condition monitoring of aero gas turbine engines is considered. Genetic algorithms are applied for the dynamic modelling of aero engines by estimating parameters of the linear reduced-order model. The use of genetic algorithms affords flexibility in the choice of performance metrics. Real engine data is used to investigate the performance genetic algorithms and this approach is compared with traditional modelling techniques used in industry.

关键词： Aero engines genetic algorithms condition monitoring

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Risk Management on Long-term Electricity Purchase Allocation in China Power Markets

Risk Management on Long-term Electricity Purchase Allocation...

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International Conference on Power electronics and Drive systems (PEDS)

作者： Ming Zhou Gengyin Li Yanli Nie Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry ofEducation North China Electric Power University Baoding Hebei China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

关键词： Risk management Power markets Portfolios Forward contracts Electricity supply industry Pricing Marketing and sales Energy consumption Power generation Scheduling

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Power Quality Disturbance Detection Based on Mathematical Morphology and Fractal Technique

Power Quality Disturbance Detection Based on Mathematical Mo...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Gengyin Li Ming Zhou Yan Luo Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

关键词： Power quality Morphology Fractals Power harmonic filters Signal sampling Signal analysis Shape Educational programs Noise shaping Voltage fluctuations

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Compensation of environmental parameters for driving-aid ultrasonic systems in foggy conditions

Compensation of environmental parameters for driving-aid ult...

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Robotics: Trends, Principles, and Applications - International Symposium on Robotics and Applications, ISORA - Sixth Biannual World Automation Congress, WAC 2004

作者： Alonso, L. Rodríguez, C. Fernández, M. Robla, S. Pérez Oria, J. Department of Electronic Technology and Atomatic Control Systems E. T. S. of Industrial Engineering and Telecommunications University of Cantabria Avda. Los Castros s/n 39005 Santander Cantabria Spain

ISBN: (纸本)1889335215

The use of driving-aid ultrasonic systems in low visibility conditions due to fog, makes it necessary to study the influence of environmental parameters such as temperature, humidity or air velocity on the ultrasonic propagation. The present work tries to construct simple empirical models for velocity and echo amplitude that includes temperature and relative humidity as inputs. We present the results obtained in the modelling of the ultrasonic propagation in environments with variable conditions of humidity and temperature, including foggy conditions.

关键词： Ultrasonics

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Neurofuzzy system with GA-based algorithm for knowledge management in network planning

Neurofuzzy system with GA-based algorithm for knowledge mana...

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IEEE Region 10 International Conference TENCON

作者： T. Sangpetch K.L. Lo Division of System Control and Operation EGAT Thailand Department of Electronic and Electrical Engineering University of Strathclyde UK

This paper presents the necessity of power system reinforcements in today's electricity supply industry. The principal outcome of the paper is two-fold. First, the paper offers a dynamic market modeling that primarily considers power system economics, reliability, security, and operation constraints. The network planning model is formulated by using stochastic modeling. Afterward neurofuzzy system with GA-based algorithm is proposed as a methodological approach. The fuzzy inference system is also presented. It mainly prioritizes all power system constraints throughout the model and evaluates a proper decision making towards the fuzzy if-then rules. Within the paper moreover, genetic algorithm (GA) is applied for optimizing the objective function whilst the recurrent neural network (RNN) technique is chosen for knowledge acquisition by training and learning all data under different power system control and operation scenarios. Eventually, some conclusions on whether or not the network reinforcements are necessarily required within a competitive marketplace are drawn.

关键词： Knowledge management Power system modeling Power system planning Power system reliability Power system economics Power system security Power system dynamics Fuzzy systems Recurrent neural networks Electricity supply industry

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