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IEEE General Meeting Power& Energy Society

作者： Defu Cai Jinfu Chen Dongyuan Shi Xianzhong Duan Huijie Li Meiqi Yao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Alstom Grid Research and Technology Center Shanghai China

This paper introduces two enhancements to the Cumulant Method (CM) for probabilistic load flow studies. The first one is to handle the correlation between input random variables. This enhancement models the correlated input random variables as a function of several independent ones by Cholesky decomposition and modifies CM equations. The second one is to adopt Monte Carlo sampling techniques to calculate the cumulants of input random variable with complex distribution function. The accuracy and efficiency of the proposed approaches are verified against Monte Carlo simulation method on modified IEEE 14-bus system. The impacts of wind speed correlation on power system operation are investigated by the proposed approaches.

关键词： Random variables Correlation Vectors Distribution functions Electronic countermeasures Matrix decomposition Load flow

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Mechanical response of the TiAl/steel brazed joint under micro-indentation and micro-hardness test

Mechanical response of the TiAl/steel brazed joint under mic...

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5th International Brazing and Soldering Conference, IBSC 2012

作者： Li, Yulong Liu, Wen Sekulic, Dusan P. He, Peng Feng, Jicai Key Lab for Robot and Welding Automation of Jiangxi Province Mechanical and Electrical Engineering School Nanchang University Nanchang China Department of Mechanical Engineering College of Engineering University of Kentucky Lexington KY 40506 United States State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology China

ISBN: (纸本)9781615039753

TiAl-based alloy may be considered as a potential material for high-temperature applications, such as rotating components of advanced ground and space vehicles. In order to manufacture large or complex structural components, it is necessary to bond TiAl-based alloy to other materials. In particular, the bonding technology of TiAl-based alloy to structural steel using brazing method has been carried out. The mechanical response of the reaction phases of the brazed joint is rarely studied. In this study TiAl and steel were brazed with the AgCuTi filler metal. The joint zone between the mating surfaces features a complex structure: Al-Cu-Ti ternary intermetallic reaction layer, AgCu residue filler, AlCu2Ti intermetallic dispersed in the residue braze and TiC layer. Mechanical properties of the reaction phases and base metals were studied by using the continuous instrumented micro indentation and conventional Vickers hardness testing. The hardness of the tested phases demonstrates a descending order as follows: (i) the Al-Cu-Ti ternary intermetallic reaction layer adjacent to TiAl substrate (ii) the AlCu2Ti intermetallic in the residue AgCu filler (iii) TiAl base metal (iv) steel (v) AgCu residue filler. The mechanical responses of the tested phases, in terms of the indentation depth are consistent with the results of hardness tests: the phases with smaller hardness are always associated with a larger indentation depth. Under the same testing conditions the Young's modulus of the TiAl substrate, Al-Cu-Ti ternary intermetallic layer, AlCu2Ti intermetallic in the residue AgCu filler, AgCu residue phase, and the steel were determined. Copyright 2012 ASM International®All rights reserved.

关键词： Titanium alloys

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DISCHARGE CHARACTERISTIC TESTS UNDER SALTY AND ACIDITY HAZE SIMULATING CONDITIONS

DISCHARGE CHARACTERISTIC TESTS UNDER SALTY AND ACIDITY HAZE ...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： CHEN WEIMIN HE ZHENGHAO WANG GUOLI MA JUN ZHANG XIAOFEI XU TAISHENG ZHAO HUAN LIU QINGYING State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology) Research Institute of China Southern Power Grid Co.Ltd.

ISBN: (纸本)9771003651221

The research on electric discharge characteristic in haze is *** may be conducive to improve the high voltage transmission line insulation design and *** paper presents recent research work of discharge characteristic tests under the haze conditions simulated in salty or *** rode-plane gap breakdown and flashover along insulator string surface are involved in the *** show that the discharge voltage is different while the concentration in salty or acidity is *** discharge has its own performance when the condition is in salty and in acidity respectively. Another important phenomenon deduce from the results is that the lowest discharge voltage in simulating haze is no obviously difference between rode-gap and insulator string while the equivalent distance are *** implies that the worst haze may cause discharge directly in space path and not along the surface of the insulator *** may lead to trip the line and the system. Some more research work is expected to do further.

关键词： DISCHARGE CHARACTERISTIC TESTS UNDER SALTY AND ACIDITY HAZE SIMULATING CONDITIONS

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An analytical method for determining circuit parameter of a solid rotor induction motor

An analytical method for determining circuit parameter of a ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Siyuan Guo Libing Zhou Tong Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Beijing aerospace control device institute Beijing China

This paper presents an analytical method for prediction of equivalent circuit parameter of a solid rotor induction motor with smooth surface. The solid rotor induction motor is similar to a linear induction motor in electromagnetic properties. Therefore, the method of performance calculation for LIM can be applied for the solid rotor induction motor. On the principle of complex power from the equivalent circuit identical to that from electromagnetic field, we develop an analytical model based on 2D polar coordinates and account for the influence of nonlinearity and hysteresis.

关键词： Rotors Solids Induction motors Equivalent circuits Magnetic hysteresis Stator windings Permeability

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Fast calculation of available transfer capability in bulk interconnected grid

Fast calculation of available transfer capability in bulk in...

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IEEE General Meeting Power& Energy Society

作者： Gang Luo Dongyuan Shi Jinfu Chen Jianghui Xi Man Jiang Youping Xu Jie Dang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Central China Grid Company Limited Wuhan China

Available transfer capability (ATC) has become an important indicator in the power system operation and planning. In order to better guide dispatchers to make decisions, this paper focuses on improving integrity of the calculation model and robustness of the algorithm. Based on the analysis of power incremental directions, constraints checking and system instable risk on ATC, a fast calculation algorithm for dynamic ATC is presented. Through improving the repeated power flow (RPF) method, this calculation framework is applicable in bulk interconnected grid. The online application of developed software in practical power grid verifies the validity and applicability of the proposed approach.

关键词： Thermal stability Power system stability Transient analysis Generators Load flow Stability criteria

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Multiobjective optimal network reconfiguration considering the charging load of PHEV

Multiobjective optimal network reconfiguration considering t...

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IEEE General Meeting Power& Energy Society

作者： Gaowang Li Dongyuan Shi Xianzhong Duan Huijie Li Meiqi Yao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science슠and슠Technology Wuhan China Alstom Grid Research and Technology Center Shanghai China

Energy crisis and environmental pollution make the electric vehicle (EV) become a hot topic. The connection of EVs to the power grid brings great challenges to the electric utilities. This paper proposes a multiobjective network reconfiguration methodology based on quantum-inspired binary particle swarm algorithm that aims at alleviating the adverse impact of plug-in hybrid electric vehicle (PHEV) on distribution system. The fuzzy sets are used to handle the multiobjective. The methodology involves two steps: load level division and network reconfiguration on each load level. Two different charging patterns of PHEV are considered in this analysis: uncoordinated charging and coordinated charging. The simulation results of a 33-bus distribution system show that the proposed methodology has a good effect on achieving the energy loss reduction and improving the voltage quality considering the charging load of PHEV.

关键词： Encoding Particle swarm optimization Energy loss Optimization Convergence Security Reliability

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An improved ip-iq reactive and harmonic current detecting method

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Telkomnika - Indonesian Journal of Electrical engineering 2012年第7期10卷 1629-1636页

作者： Cunping, Wang Xianggen, Yin Minghao, Wen Zhe, Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science Luo Yu Road No. 1037 Hongshan District Wuhan China

Static synchronous compensator (STATCOM) is a widely used power electronic device to achieve dynamic reactive power compensation and improve the power quality of the system. The ip-iq current detecting method is generally used for STATCOM reactive and harmonic command current detecting. However, it is required that the compensation point of STATCOM be the same as the load current detecting point when using the traditional ip-iq method, limiting the flexibility to choose the installation position of STATCOM. To solve this problem, this paper proposed an improved ip-iq reactive and harmonic current detecting method, both voltage phase angles of the load point and the STATCOM point are used, making the installation position of STATCOM no longer limited by the load current detecting point. The improved ip-iq current detecting method is applied in the DT-STATCOM system, and the simulation results verify the correctness and effectiveness of the improved ip-iq current detecting method. © 2012 Universitas Ahmad Dahlan.

关键词： Static synchronous compensators

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Design of LCL filters for the back-to-back converter in a doubly fed induction generator

Design of LCL filters for the back-to-back converter in a do...

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2012 IEEE Innovative Smart Grid Technologies - Asia, ISGT Asia

作者： Zhan, Peng Lin, Weixing Wen, Jinyu Yao, Meiqi Li, Naihu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China Alstom Grid China Technology Center Shanghai China

ISBN: (纸本)9781467312219

Wind power generator based on Doubly Fed Induction Generator (DFIG) incorporates a back-to-back PWM converter. Filters are used to eliminate the harmonics produced by the PWM converter. However, very few papers have detailed the design procedure of the filters for a DFIG based wind power generator. A systematic procedure to design the LCL filters for DFIG back-to-back converter is proposed in this paper. Both filters for the grid side converter and the rotor side converter are designed. Simulations in PSCAD/EMTDC verify the effectiveness of the design procedure. © 2012 IEEE.

关键词： Design

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A cost-effective multi-gigabit 60-GHz wireless over optical fiber access system based on a novel frequency quintupling technique

A cost-effective multi-gigabit 60-GHz wireless over optical ...

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2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012

作者： Zhang, Liang Fan, Shu-Hao Liu, Cheng Zhu, Ming Hu, Xiaofeng Li, Zhihua Su, Yikai Chang, Gee-Kung State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States

We propose and demonstrate a cost-effective wireless over optical fiber access system using frequency quintupling technique. A 2.5-Gb/s OOK signal at 60-GHz is successfully transmitted through 30-km SSMF and 10-ft air... 详细信息

ISBN: (纸本)9781457715266

关键词： Optical fibers

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Deactivation and in situ regeneration of anion exchange resin in the continuous transesterification for biodiesel production

Deactivation and in situ regeneration of anion exchange resi...

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作者： He, Benqiao Ren, Yanbiao Cheng, Yu Li, Jianxin State Key Lab of Hollow Fiber Membrane Materials and Processes School of Materials Science and Engineering Tianjin Polytechnic University Tianjin 300160 China Laboratory of Membrane Materials and Separation Engineering Technology Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201203 China

The deactivation and in situ regeneration of anion exchange resin (D261) used as a catalyst in the continuous transesterification of soybean oil with methanol for biodiesel production were studied in a fixed-bed reactor. The chemical and physical structures of the resins were investigated by means of X-ray photoelectron spectrometer (XPS), N2 adsorption/desorption isotherms, and scanning electron microscope (SEM). The results showed that biodiesel conversion was over 90% within the run time of 4 h but rapidly declined to 23.7% after 8 h. The fouling of organic substances (triglyceride and glycerol) covered on the resin was the main reason leading to the decrease in the biodiesel conversion. The fouling extent on the resin was related to the resin position in the fixed bed. The largest activity loss of the resin occurred at the bottom of the fixed bed. The leakage of OH- groups from the resins, independent of the resin height in the bed, also resulted to the decline of the resin activity. An in situ regeneration method was put forward. The resin regenerated can be restored to the original catalytic activity to perform continuous transesterification for biodiesel production. © 2012 American Chemical Society.

关键词： Transesterification

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