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检索条件"机构=Laboratory of Power System Protection and Dynamic Security Monitoring and Control"

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A new protection algorithm for EHV transmission line based on singularity detection of fault transient voltage

A new protection algorithm for EHV transmission line based o...

引用

International power Engineering Conference (IPEC)

作者： Ming-yu Yang Wan-ye Yao Zeng-ping Wang Yan-jun Jiao Ju Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Baoding Hebei China Automation Department of North China Electric Power University Baoding Hebei China

ISBN: (纸本)9810557027

A new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines is presented in this paper. The singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500 kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions

关键词： Transmission lines Fault detection power system transients Voltage power system protection power transmission lines Wavelet transforms Circuit faults Signal detection Frequency

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Integrating Radial Basis Function Neural Network with Fuzzy control for Load Forecasting in power system

Integrating Radial Basis Function Neural Network with Fuzzy ...

引用

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

作者： Siqing Sheng Cong Wang Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Electrical Engineering North China Electric Power University Baoding Hebei China

Short-term load forecasting of power system is not only the basis of scheduling of generating sets, but also the basis of working out the transaction schedule in electricity market. This paper proposes a short-term load forecasting method based on combination of radial basis function (RBF) neural network and fuzzy control, uses on-line self-modify factor fuzzy control to eliminate forecast error on the basis of RBF neural network forecasting. The practical examples show that the accuracy of short-term load forecasting and training speed can be improved and gains the very satisfactory results by the proposed method

关键词： Radial basis function networks Fuzzy control Load forecasting power system control power systems Neural networks Economic forecasting power generation Electricity supply industry Error correction

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Fourier series method on eliminating narrow frequency noise in partial discharge detection

Fourier series method on eliminating narrow frequency noise ...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Yangchun Chen Chengrong Li Wei Wang North China Electric Power University Beijing China Beijing Key Laboratory of High Voltage and EMC Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Beijing China

A new method to eliminate periodical narrow frequency noises in partial discharge detection of electric power system apparatus, Fourier series method, is presented. It uses the difference not only on frequency domain but also mainly on time duration between signals and noises. The anti-interference effect of this method was analyzed by experiments data on field. Several factors that can make influence to the affect of this method, such as the error of frequencies of the noise, the data length by which the Fourier coefficients are calculated, the error of A/D conversion, were discussed respectively. It was found that this method can almost completely banish narrow frequency noises, at the same time can retain the amplitude and polarity of partial discharge pulses, even if the main frequency of the partial discharge pulses are close to that of narrow frequency noises. The affect of this method was also contrasted with normal method, such as digital filter, adaptive filter and wavelet. The result shown that this new method has obvious predominance at remaining the amplitude and polarity of pulse signals.

关键词： Fourier series Partial discharges Pulse power systems Low-frequency noise Laboratories Frequency domain analysis Noise level Digital filters Adaptive filters power system harmonics

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power Quality Disturbance Detection Based on Mathematical Morphology and Fractal Technique

Power Quality Disturbance Detection Based on Mathematical Mo...

引用

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

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

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

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

引用

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

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.

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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Research on Remote Meter Automatic Reading Based on Computer Vision

Research on Remote Meter Automatic Reading Based on Computer...

引用

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

作者： Shutao Zhao Baoshu Li Jinsha Yuan Guiyan Cui Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Electrical Communication Department North China Electric Power University Baoding Hebei China North China Electric Power University Baoding Hebei China

A novel method is put forward, which the power meter can be read based on compute vision, and the architecture of remote meter auto reading system is designed. Different with the normal automatic meter reading system that must obtain the value from digital communication interface, the new method recognizes the meter reading utilizing the computer vision technique, it is a kind of non-contact measurement. In the meter automatic reading, the computer vision discrimination, incorporate human's ability of visual and apprehensive models. Not only the digital display power meter can be read, but also the direct-reading instrument can be fetched. In this paper, the scheme of remote automatic reading is introduced, the local meter reading information of distributed substation can be transmitted to center using computer network and then the pretreatment, segmentation and pattern matching, are detailed description in the meter image recognition process. Via energy meter automatic recognition experiment, the results based computer vision is accurate enough to monitor the remote substation running parameters

关键词： Computer vision Meter reading Substations Computer architecture Automatic meter reading Digital communication power system modeling Computer displays Instruments Computer networks

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Numerical prediction of EMI on the secondary DC cable in cable tunnel due to a direct lightning strike in substation

Numerical prediction of EMI on the secondary DC cable in cab...

引用

作者： Qi, Lei Cui, Xiang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Hebei 071003 China

Electromagnetic interference (EMI) on secondary dc cable in cable tunnel due to a direct lightning strike in substation threatens the safe operation of electronic equipment and system connected to the cable. In order to reduce EMI, the cable shield is generally connected to the grounding grid at both ends. Ground potential difference between two grounding points of the cable shield can be high due to high impedance of the grounding grid at high frequencies. In this paper, we present a hybrid method to analyze this complex system. As a result, both the current flowing in the cable shield and the transverse voltage between the cable core and shield are calculated. Compared with the measured results, the proposed method is demonstrated to be correct and effective. © 2006 IEEE.

关键词： Signal interference

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Subcell FDTD analysis of shielding effectiveness of a thin-walled enclosure with an aperture

Subcell FDTD analysis of shielding effectiveness of a thin-w...

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作者： Jiao, Chaoqun Li, Lin Cui, Xiang Li, Huiqi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Hebei 071003 China

An improved subcell model is presented for including thin material sheets method in the finite-difference time-domain (FDTD) method. This improved subcell can be used to simulate a thin magnetic (μs ≠ μo) sheet. Then, the improved subcell model is applied to the analysis of the shielding effectiveness (SE) of the electromagnetic wave propagating through a thin infinite material sheet, which is verified by comparison with the analytical results. Updated equations for components of the field on special spatial grids which are on edges and corners of the enclosure are presented, and the subcell model is used for the analysis of a thin-walled enclosure with an aperture. The FDTD results are in very good agreement with the test results. © 2006 IEEE.

关键词： Thin walled structures

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Improved subcell model of thin multilayer material sheet in FDTD method

Improved subcell model of thin multilayer material sheet in ...

引用

作者： Jiao, Chaoqun Cui, Xiang Li, Lin Li, Huiqi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Hebei 071003 China

An improved subcell model is presented for including thin sheets in the finite-difference time-domain (FDTD) method. This improved subcell model can simulate thin multilayer material sheets and was verified by comparison with the analytical results for the analysis of shielding effectiveness (SE) of the electromagnetic wave through a thin multilayer sheet. Then, the subcell model was used for the analysis of SE of a multilayer thin-walled enclosure with an aperture. The FDTD results were in very good agreement with the test results. Finally, the electromagnetic wave penetration through a wall of an enclosure and the electromagnetic wave coupling through an aperture of enclosure were compared. © 2006 IEEE.

关键词： Mathematical models

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Information Retrieval Technology 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Sung Hyon Myaeng Ming Zhou Kam-Fai Wong Hong-Jiang Zhang

ISBN: (数字)9783540318712

ISBN: (纸本)9783540250654

TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locations in Asia, starting from 1996. While the IRAL workshops had their focus on inf- mation retrieval problems involving Asian languages, AIRS covers a wider scope of applications, systems, technologies and theory aspects of information retrieval in text, audio, image, video and multimedia data. This extension of the scope re?ects and fosters increasing research activities in information retrieval in this region and the growing need for collaborations across subdisciplines. We are very pleased to report that we saw a sharp increase in the number of submissions and their quality, compared to the IRAL workshops. We received 106papersfromninecountriesinAsiaandNorthAmerica,fromwhich28papers (26%) were presented in oral sessions and 38 papers in poster sessions (36%). It was a great challenge for the Program Committee to select the best among the excellent papers. The low acceptance rates witness the success of this year’s conference. After a long discussion between the AIRS 2004 Steering Committee and Springer, the publisher agreed to publish our proceedings in the Lecture Notes in Computer Science (LNCS) series, which is SCI-indexed. We feel that this strongly attests to the excellent quality of the papers.

关键词： Information Storage and Retrieval Information systems Applications (incl. Internet) Algorithm Analysis and Problem Complexity Data Structures Data Storage Representation Discrete Mathematics in Computer Science

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