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检索条件"机构=AREVA T&D Automation슠and Information Systems"

共 119 条记录，以下是91-100 订阅

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Study on factors affecting the harmonics of large-scale rectification device in power grid

Study on factors affecting the harmonics of large-scale rect...

引用

International Universities Power Engineering Conference (UPEC)

作者： J. Jiang B.H. Zhang Z.G. Hao Y.Y. Yuan Z.Q. Bo A. Klimek State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China AREVA T&D Automation슠and Information Systems Stafford UK

In recent years, with the rapid development of the power electronic technology, various power electronic devices and nonlinear elements, especially of many kinds of rectifier and switcher, are applied widely in power system. Harmonics have produced serious adverse effects in the equipment of power generators and distribution system, and of their control and protection, as well as the users and the communication fields. due to the increasing requirements of power quality, the influence of harmonics of large scale power rectifier couldn't be ignored. Harmonic voltage and harmonic current are in a high level relatively because of the large power consumption of the rectifier. this paper mostly studies the factors which affects the content of harmonics. this paper briefly introduces the main structure of the aluminum electrolyzation rectifying system and operating principle, and the reason that harmonics caused and its harm, also analyzes the harmonics of the system about a real rectifying system. On the foundation of the work done above, electromagnetic transient simulation model of the aluminum electrolyzation rectifying system is established at PSCAd/EMtdC. Harmonics of the system either in all units or all except standby unit on is analyzed. In all units on, characteristic harmonics (84n±1, including harmonic voltage and harmonic current) and uncharacteristic harmonics (3rd, 5th, 7th) are negligible. And in all except standby unit on, characteristic harmonics are still almost the same, while many new uncharacteristic harmonics (12n±1, especially 11th and 13th) are generated. In addition, certain uncharacteristic harmonics will be produced because of the asymmetric system and transformer parameters such as leakage resistance and three-phase voltage. Finally, the paper briefly discusses several solutions to decrease harmonics and improve the power quality.

关键词： Harmonic analysis Rectifiers Power harmonic filters Aluminum Electrochemical processes

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Application of transient Polarity Comparison technique to Power System Protection

Application of Transient Polarity Comparison Technique to Po...

引用

IEEE/PES transmission and distribution Conference and Exhibition: Asia and Pacific

作者： Z.Q. Bo X.Z. dong B.R.J. Caunce J.H. He d. thomolier A. Klimek Z. Chen M.A. Redfern AREVA T&D Automation슠and Information Systems UK Tsinghua University China Beijing Jiaotong University China University of Aalborg Denmark University of Bath UK

this paper introduces the development of transient polarity comparison principles for power line protection. A brief introduction to the history of power system protection is first given, which outlines the background of the new developments. the paper then introduces the new protection techniques based on fault transient polarity detection. the descriptions of new relaying techniques based on the detection of fault generated transients and their associated protection schemes are the main part of the paper. the new protection techniques based on transient polarity comparison not only offer significant new features for power line protection, but also produce novel schemes for the integrated protection of power network

关键词： Power system transients Power system protection Power system relaying Protective relaying digital relays History Electrical fault detection Fault detection Microprocessors Circuit faults

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Realization of the transient-based boundary protection for HVdC transmission lines based on high frequency energy criteria

Realization of the transient-based boundary protection for H...

引用

International Conference on Power System technology (POWERCON)

作者： S. Zhang B. H. Zhang M. You Z. Q. Bo State key laboratory of electrical insulation and power equipment Xi'an Jiaotong University Xi'an China AREVA T&D Automation슠and Information Systems Stafford UK

Smoothing reactors, together with the dC filter banks installed at both ends of the HVdC transmission line constitute the `natural boundary', which leads to significant difference in attenuation characteristic of different frequency components of fault transient signals detected by protection. By means of Hilbert-Huang transform, which is a kind of non-stationary transient signal processing method, the energy of high frequency components(2000Hz~10kHz) is extracted based on the attenuation characteristic of the line boundary, then a novel algorithm for the non-unit transient-based protection is acquired. Moreover, a protection threshold that is adapt to various lengths of transmission line is obtained by extensive simulation work. Experimental results indicate that the new criteria can identify any internal fault on the whole line and clear it rapidly and credibly, what's more important, the accuracy and reliability of the criteria will not be influenced by the length of the transmission line.

关键词： HVdC transmission transient analysis Circuit faults Attenuation Filter bank transforms

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Ethernet based Substation Communication System for Integrated Protection

Ethernet based Substation Communication System for Integrate...

引用

International Conference on Power System technology (POWERCON)

作者： Y L Ren J H He Z Q Bo X Z dong B R J Caunce A Klimek Department of Electrical Engineering Beijing JiaoTong University China AREVA T&D Automation슠and Information Systems UK Department of Electrical Engineering Tsinghua University China

this paper presents studies on an Ethernet based substation communication system for supporting the integrated protection. Recent developments in power system protection are firstly outlined, the paper then describes a substation integrated protection system supported by an advanced communication network. detailed discussion and design on the communication network and the transmission protocol, the capacity and speed of the network etc. are also the main topic of this paper. Studies show that the proposed Ethernet is able to meet the demand of the integrated protection.

关键词： Ethernet networks Substation protection Power system protection Protective relaying Power system relaying Circuit faults Microprocessors Power system transients digital relays Fault detection

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Optimal Reclosing time of transmission Lines and its Application in Real Power System

Optimal Reclosing Time of Transmission Lines and its Applica...

引用

2008 IEt 9th International Conference on developments in Power System Protection (dPSP 2008)

作者： P. Li B.H. Zhang Z.G. Hao Y.F. Rao Y. t. Wang Z.Q. Bot A. Klimek Q. Zhao W. He School of Electrical Engineering Xi''an Jiaotong University Xi'an China AREVA T&D Automation슠and Information Systems UK Ningxia Electric Power Corporation Yinchuan China

the study of various stability-control methods for a transmission system indicates that the reclosing time of a transmission line has a distinct influence on system stability. And there is an optimal reclosing time (ORt) for all transmission line faults. Utilizing the transient energy function (tEF) with classical models considered, the ORt setting computation method is proposed. this paper shows the validity and practicability of ORt. Based on analyzing the characteristic and influencing factors of the ORt, the setting criteria of reclosing time for transmission line is presented. It will conduct simulations with a complex real system in Northwest of China. Simulation studies show that this technique can significantly increase the security margin and damp the oscillation of the power system. It is indicated that the variation of optimal reclosing time of a certain transmission line is insensitive to these influencing factors: the fault location, fault clearing time and pre-fault power flow of this line. Finally, the setting strategy is drawn to optimize the reclosing time of the key transmission lines in NingXia network under current technological conditions.

关键词： Power system stability Generators Stability analysis Power systems Power transmission lines Stability criteria Mathematical model

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Application of Spectrum-spread technology in Power Line Communication

Application of Spectrum-spread Technology in Power Line Comm...

引用

International Universities Power Engineering Conference (UPEC)

作者： Niu dongWen Zhang BaoHui Liang dong Z.Q. Bo A. Klimek State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China AREVA T&D Automation슠and Information Systems Stafford UK

In this paper, on the basis of the analysis of power line channel characteristic,we firstly build a power line channel mode. And then, we elaborate the spectrum theory and its main performance indexes. At last, the direct sequence spread spectrum communication system is build by MAtLAB/Simulink using the power line channel mode. the simulation results prove that the Spectrum-spread technology can be used in Power Line Communication.

关键词： Spread spectrum communication Interference Power line communications White noise Bandwidth Bit error rate

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the Scheme of Single-Phase Adaptive Reclosing on EHV/UHV transmission Lines

The Scheme of Single-Phase Adaptive Reclosing on EHV/UHV Tra...

引用

2008 IEt 9th International Conference on developments in Power System Protection (dPSP 2008)

作者： Li Bin Zhang Shuo P.A.Crossley Bo Zhiqian Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University of Technology Tianjin China AREVA T&D Automation슠and Information Systems Stafford UK

Automatic reclosure (AR) is extremely effective in improving the reliability, stability and security of the overall power system. However, the present autoreclosure operates blindly and practices employing a fixed time. In the case of permanent fault, a second shock to the system can cause irreparable damage to expensive equipments. According to characters of transient faults and permanent faults, this paper introduces the method of Bergeron line model into the field of single-phase adaptive reclosing (SPAR). therefore, the paper proposes a novel scheme based on the calculation of Bergeron model to realize SPAR. theoretical analysis and simulation prove that the proposed scheme of single-phase adaptive reclosing is valid with high sensitivity and reliability.

关键词： Circuit faults transient analysis Power system transients Power transmission lines Adaptation model Fault currents Harmonic analysis

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theoretical Analysis on Subharmonic Resonance Overvoltage

Theoretical Analysis on Subharmonic Resonance Overvoltage

引用

International Conference on Electrical and Control Engineering (ICECE)

作者： E.S. Jin X.F. Chen G.W. Xia Z.Q. Bo A. Klimek Electrical Engineering Institute Northeast Dianli University Jilin China Tongliao Electric Power Bureau Tongliao China AREVA T&D Automation슠and Information Systems Stafford UK

With the continue increases in power system voltage level, more and more complex wiring has resulted in the more frequently occurrence of the subharmonic resonance. to address this issue, this paper deduces the mathematical expression of the subharmonic resonance and uses mathematical analysis method to solve the nonlinear differential equations based on the system equivalent diagram. the relevant influential factors of the subharmonic resonance overvoltage amplitude are derived and the influence of all relevant factors on subharmonic resonance overvoltage are analyzed in detail.

关键词： Resonant frequency Voltage control Equations Inductance Mathematical model Power systems Capacitance

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An adaptive inverse time-delay characteristic of the zero-sequence overvoltage protection for identification of the single-phase earth fault in the neutral non-effectively grounded power systems

An adaptive inverse time-delay characteristic of the zero-se...

引用

IEEE General Meeting Power& Energy Society

作者： Xiangning Lin Zhimin Zhao Zhiqian Bo College of Electrical Engineering and Information Technology Three Gorges University Hubei China College of Electrical information Engineering Pingdingshan University Pingdingshan China AREVA T&D Automation슠and Information Systems Stafford UK

In a neutral non-effectively grounded power system, the correct identification and isolation of the faulty feeder on the occurrence of a single-phase earth fault is always a difficult task. to improve the level of distribution automation, a novel method of negative-sequence current compensation based adaptive zero-sequence over-voltage protection is put forward in this paper. On the basis of the analysis of the transient negative-sequence current, it can be proved that the negative sequence current through the faulty feeder is far higher than those through the sound feeder in any configuration of distribution network and neutral compensation modes. therefore, an adaptive inverse time delay characteristic is adopted by the basic zero-sequence over-voltage protection. A compensated voltage is generated by means of multiplying the modal maximum of the negative-sequence current of the feeder by a settable compensated reactance, and then it is combined with the magnitude of the zero-sequence voltage to consist of the compounded compensated voltage. this compensated voltage is utilized to revise the characteristic of the inverse time-delay. By this means, the zero-sequence over-voltage protection will possess the selectivity adaptively. the effectiveness of the proposed method has been verified with the results of the theoretical analysis and simulations.

关键词： Power system protection Voltage control Fault diagnosis Power system faults Circuit faults automation transient analysis Fault currents Power system transients Power system simulation

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A positional polarity comparison relay utilizing global positioning system

A positional polarity comparison relay utilizing global posi...

引用

IEEE/PES transmission and distribution Conference and Exhibition: Asia and Pacific

作者： Z Q Bo A Klimek M Han X Z dong B H Zhang AREVA T&D Automation슠and Information Systems Stafford UK Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical Engineering Xi'an Jiaotong University Xi'an China

this paper presents a new relay for the protection of power transmission systems by using the global positioning system (GPS) and the transient polarity comparison techniques, the positional polarity comparison relay. A specially designed protection relay detects the fault generated high frequency current transient signals and records the polarity of the transient signal and the time instant corresponding to when the initial travelling wave generated by the fault arrives at that busbar. A communication unit is used to transmit and receive coded digital signals of the local information to and from the associated relay(s) in the system. At each substation, the relays determine the location of the fault by comparing the polarity and the GPS time stamps measured locally with those received from the adjacent substations. Simulation studies presented in the paper demonstrate the feasibility of the scheme.

关键词： Power system relaying Protective relaying digital relays Power system protection Global Positioning System Signal generators Substations Power transmission Signal design Electrical fault detection

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