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2009 IEEE 6th International power Electronics and Motion control Conference, IPEMC '09

作者： Yugang, Yang Lee, Fred C. Hongzhu, Li Jiaju, Wu Liaoning Technical University Institute of Electrical and Control Engineering Huludao 125105 China Virginia Polytechnic Institute State University Center for Power Electronics System Blacksburg VA 24061 United States Nanchang Hangkong University Nondestructive Test Key Laboratory of Ministry Education Nanchang 330034 China

ISBN: (纸本)9781424435562

It's necessary to decrease the leakage inductance of transformer because it often produces a large voltage peak as device is turned off, meanwhile the large voltage peak is a source of EMI and produces a large voltage stress and affects the power supply's efficiency. This paper proposes a kind of low leakage inductance planar transformer with shunt magnetic circuit structure, the primary winding number of this structure can be decreased to 1 turn and the equivalent secondary winding can be decreased to less than 1 turn, therefore the leakage inductance can be decreased remarkably, and it can be used to various turns ratio of high frequency transformer expressly in the transformer of low voltage and large current power supply. This shunt magnetic structure is verified with Maxwell 3D. ©2009 IEEE.

关键词： Inductance

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Fundamental Research on Dielectric Breakdown between XLPE and Silicon Rubber Interface in HV Cable Joint

Fundamental Research on Dielectric Breakdown between XLPE an...

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第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： L.Gu B.X.Du Xiangjin Zhang Xiaohui Zhu Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Tianjin Professional University Tiajin 300402 China Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical

ISBN: (纸本)9781424443673

The effect of interfacial pressure on the insulation breakdown of the interface between a piece of XLPE and a piece of silicon rubber was investigated. A pair of plate-needle electrodes was sandwiched at the interface. A uniformly distributed weight was put on the sample with the interfacial pressure from 20 kN/cm2to 300 kN/cm2. The breakdown voltage and the discharge current were recorded;the light distribution at the interface were visually recorded and then analyzed. Results demonstrate that correlation exists between the discharge light and discharge current;breakdown voltage decreases with the decrease of interfacial pressure;both the distributions of light and current depend on the interfacial pressure. Therefore, sufficient interfacial pressure between cable and joint should be met to lengthen the cable joint's life expectation.

关键词： Cable Joint XLPE Silicon rubber Interfacial failure Discharge light distribution

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Novel Connection Scheme of Backup power Supply Adaptive to Distribution Line Non-Communication Protection and New Criterion for High Voltage and Large Capacity Induction Motor

Novel Connection Scheme of Backup Power Supply Adaptive to D...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Kun Liu Xinzhou Dong Zhiqian Bo State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Stafford UK

This paper presents a new practical backup power supply connection scheme for distribution line non-communication protection (DNCP). simulation tests have been conducted using the alternate transient program (ATP) with respect to a typical single circuit breaker multi-section system. The results prove that the new scheme is able to not only recover the power supply of loads on healthy lines automatically, but also create disturbances in favor of accelerated over current (AOC) criterion. Aiming at the failure of directional under voltage (DUV) criterion derived from high voltage and large capacity induction motor load, a novel criterion using the increment of reactive power is proposed.

关键词： Emergency power supplies Voltage Induction motors power system protection Circuit testing Circuit simulation system testing power system transients Circuit breakers power supplies

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Security Constrained Distributed Optimal power Flow of Interconnected power systems

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Transactions of Tianjin University 2008年第3期14卷 208-216页

作者：哈比比余贻鑫 Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University

The security constrained distributed optimal power flow （DOPF） of interconnected power systems is presented. The centralized OPF problem of the multi-area power systems is decomposed into independent DOPF subproblems, one for each area. The dynamic security region （DSR） to guarantee the transient stability constraints and static voltage stability region （SVSR） constraints, and line current limits are included as constraints. The solutions to the DOPF subproblems of the different areas are coordinated through a pricing mechanism until they converge to the centralized OPF solution. The nonlinear DOPF subproblem is solved by predictor-corrector interior point method （PClPM）. The IEEE three-area RTS-96 system is worked out in order to demonstrate the effectiveness of the proposed method.

关键词： distributed optimal power flow interior point method predictor-corrector method security region

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Modeling of Busbars in High power Neutral Point Clamped Three-Level Inverters

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Tsinghua Science and Technology 2008年第1期13卷 91-97页

作者：易荣赵争鸣钟玉林 State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua University

The busbars in high power neutral point clamped three-level inverters are modeled using the Maxwell Q3D Extractor software, which is based on the partial element equivalent circuits method. The equivalent circuits of the busbars and devices model are simulated in the electric simulator PSlM to analyze the effects of the parasitic inductance on the switching characteristics of the integrated gate commutated thyristor （IGCT） in different topology positions. The simulation results agree well with the measured impedance analyzer results and the IGCT test results, which proves the effectiveness of the modeling method for the large, complex busbars.

关键词： busbars parasitic inductance partial element equivalent circuits switching characteristics

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Frequency-Feedback Based Islanding Detection Algorithm for Micro-Grid

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Transactions of Tianjin University 2008年第2期14卷 85-91页

作者：李永丽李盛伟摆世彬牛冲宣 Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin UniversityTianjin 300072China

The unintentional islanding of micro-grid may cause negative impacts on distribution loads and distributed generations,so it must be detected within the acceptable *** this paper a new islanding detection algorithm is *** algorithm introduces the frequency feedback method by the reactive power compensation to derive the frequency continuous shift. Accordingly,the islanding can be detected by monitoring the frequency within 0.1 *** simulation results prove that this algorithm has extremely small non-detection zone,and meanwhile it presents an excellent islanding detection speed as well.

关键词： distributed generation micro-grid islanding detection reactive power compensation

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A kind of Low Leakage Inductance Planar Transformer

A kind of Low Leakage Inductance Planar Transformer

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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： Li Hongzhu Yang Yugang Fred.C.Lee Wu Jiaju Liaoning Technical University/Institute of Electrical & Control Engineering Huludao125105China Virginia Polytechnic Institute and State University/Center for Power Electronics System BlacksburgV Nanchang Hangkong University/Nondestructive Test Key Laboratory of Ministry Education Nanchang33003

关键词： Inductance power transformer insulation power supplies Magnetic circuits Electromagnetic interference Leg Stress Frequency Electronic equipment testing Transformer cores

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Overvoltage Suppression for UHV Transmission Lines

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Transactions of Tianjin University 2008年第3期14卷 222-225页

作者：李永丽刘太华李仲青景雷龙英范建忠 Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University ABB (China) Research Ltd.

The overvoltage phenomena of ultra high voltage (UHV) transmission lines are analyzed and verified by EMTDC/PSCAD simulation. Referring to the theoretical analyses and operating experiences of extra high voltage (EHV) transmission lines in China and UHV transmission lines in Russia and Japan, the methods to suppress the internal overvoltage in UHV transmission lines by protection and control strategies are discussed. Through the cooperation among the recloser, shunt reactor, tripping and closing resistance, and metal oxide varistor(MOV), the overvoltage can be restrained within an acceptable level.

关键词： overvoltage reclosing relay protection shunt reactors suppression UHV transmission lines

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Instantaneous energy balancing in three-level neutral point clamped converters

Instantaneous energy balancing in three-level neutral point ...

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2008 IEEE Vehicle power and Propulsion Conference, VPPC 2008

作者： Ting, Lu Zhengming, Zhao Liqiang, Yuan Shuping, Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781424418497

Instantaneous energy balancing plays an important role in power electronics conversion. The unbalance of electromagnetic energy not only debases the system performance but also decreases the reliability and efficiency of the conversion. In this paper, instantaneous energy balancing problems in three-level neutral point clamped (NPC) converters are classified and discussed. Typical examples and their usual solutions of each kind of problems are expounded and compared. In the end of this paper, limitations and disadvantages of traditional methods are analyzed, and electromagnetic field method is summarized as the new trend to analyze electromagnetic energy transmission and exchange. The method using electromagnetic field theory is emphasized to be the better approach to solve the aforementioned energy balancing problems. © 2008 IEEE.

关键词： Electromagnetic waves

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A novel modbus RTU-based communication system for adjustable speed drives

A novel modbus RTU-based communication system for adjustable...

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2008 IEEE Vehicle power and Propulsion Conference, VPPC 2008

作者： Sideng, Hu Zhengming, Zhao Yingchao, Zhang Shuping, Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781424418497

The communication protocol is important for applying adjustable speed drive (ASD) systems to an industry network. This paper proposes a novel scheme of communication system for the ASD system based on Modbus protocol. The most remarkable advantage of the approach lies in the tradeoff between performance and economic cost for a power converter system. The overall system is built on master-slave structure and easy for interacting with other networks. An additional study on the cyclic redundancy check (CRC) in Modbus RTU is introduced to obtain the optimization design in the actual application and the optimization method in software design is also presented. The performance of the communication system obtained from experiment conducted on the 15kW ASD system validates the effectiveness of the proposed design method. © 2008 IEEE.

关键词： Software design

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