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International Conference on Electrical Machines and Systems

作者： Jianbo Sun Shuanghong Wang Zhe Kuang Huangyuan Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781467323277

Compared with the conventional short-pitched winding switched reluctance machine, the fully-pitched winding machine produces the effective electromagnetic torque by utilizing the changing mutual inductances among the phase windings. Previous works show that the fully-pitched winding machine can offer better circuit utilization, higher ratio of torque and current and higher efficiency. This paper compares the static and dynamic performances of these two winding configuration machines at the condition of same outline size, phase voltage and revolving speed. The results show that the advantages of fully-pitched winding machine only appear in the low speed range. According to low speed applications, such as servo drives and torque machine, the torque ripple reduction is necessary. This paper introduces the instantaneous torque closed-loop control to suppress the torque ripple of two machines. By experimental comparison, it is seen that the fully-pitched winding machine is superior to short-pitched winding machine only regarding to low speed applications.

关键词： Fully-pitched Winding Switched Reluctance Machine Torque Ripple

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Direct Torque and Adaptive Flux Control of Novel Transverse-flux Permanent Magnet Motor with Brushless DC Drive

Direct Torque and Adaptive Flux Control of Novel Transverse-...

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International Conference on Electrical Machines and Systems

作者： Xiaotao Tu Yinyin Dai Chenglin Gu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781467323277

To solve the problem of controlling the stator flux linkage amplitude, a direct torque control (DTC) scheme is proposed for a novel transverse-flux permanent magnet motor (TFPMM) with two-phase conduction mode of brushless DC drive. In this approach, flux linkage hysteresis comparator is removed and the desired voltage space vector is determined by only stator flux position and the output from torque hysteresis comparator, obtaining adaptive stator flux linkage. Further, reasonable phase compensation for the difference of optimal phase advance angle and the angle between stator and rotor flux is adopted to obtain maximum torque per ampere in the constant torque region. The validity and effectiveness of the proposed DTC scheme are verified through simulation results.

关键词： Transverse flux permanent magnet motor Brushless DC drive Direct torque control Maximum torque per ampere

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Stability Analysis of Power System in Cape Verde with High Penetration Level of Wind Power under Short Circuit Fault

Stability Analysis of Power System in Cape Verde with High P...

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Asia-Pacific Power and Energy engineering Conference

作者： Yu Zhang Luis Teixeira Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Praia Cape Verde

ISBN: (纸本)9781457705458

The large-scale wind power may influence the stability of the power system when its penetration level exceeds some limit and some disturbance as the short circuit happen. To study and preview this phenomenon before connect the wind farm into the grid, the use of simulation method has been a good tool. This paper evaluated the stability analysis of the power system in Santiago Island, Cape Verde, considering a 9.25 MW wind farm installed and connected into the 40 MW grid. The simulation results by MATLAB/Simulink? show the stable performance of power system under short circuit fault. The effect of STATCOM is also evaluated.

关键词： Stability simulation Simulink wind farm high penetration level short circuit.

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IMPACT OF WIND SPEED CORRELATION ON PLANNING AND OPERATION OF DISTRIBUTION NETWORK

IMPACT OF WIND SPEED CORRELATION ON PLANNING AND OPERATION O...

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Workshop on Integration of Renewables into the Distribution Grid

作者： Defu CAI Jinfu CHEN Dongyuan SHI Huijie LI Meiqi YAO State Key Laboratory of Advanced Electromagnetic Engineering Technology (Huazhong University of Science and Technology) ALSTOM Grid Technology Center Co Ltd.

ISBN: (纸本)9781622763153

This paper establishes the model of wind speed correlation (WSC) by inverse Nataf transformation. The impacts of WSC on distribution network operation and maximum installed capacity of wind power are investigated by Monte Carlo simulation and chance constrained programming method. A new definition of wind power penetration is proposed. Finally, conclusions are duly drawn.

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Applications of Embedded HVDC in Power System Transmission

Applications of Embedded HVDC in Power System Transmission

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Power engineering and Automation Conference

作者： Jicheng Yu George G. Karady Lei Gu School of Electrical Computer and Energy Engineering Arizona State University State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781457715983

High Voltage Direct Current (HVDC) technology has been widely recognized advanced in power transmission. Classical HVDC has shown its advanced features in long distance bulk power delivery, submarine cable crossings, and asynchronous interconnections. Therefore, the new generation of technology, embedded HVDC, is further broadening the range of applications of HVDC transmission. The embedded HVDC is beneficial to all traditional occupations. Meanwhile, perspective novel applications, which are involved in offshore transmissions, infeed large urban areas, DC segment grid, and weak AC system connections, come into service. The installation of the embedded HVDC systems on the existing AC power grid may largely improve the transient stability and power flow oscillation damping factor of power transmission system.

关键词： Embedded HVDC VSC IGBT Power Transmission Asynchronous Interconnection HVDC Applications

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UTILIZING LOCAL RESOURCES TO PARTICIPATE IN POWER BALANCE: A CONCEPT AND ITS REALIZATION

UTILIZING LOCAL RESOURCES TO PARTICIPATE IN POWER BALANCE: A...

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Workshop on Integration of Renewables into the Distribution Grid

作者： Zhihan JIANG Jinfu CHEN Xianzhong DUAN Naihu LI Meiqi YAO State Key Laboratory of Advanced Electromagnetic Engineering Technology (Huazhong University of Science and Technology) ALSTOM Grid Technology Center Co Ltd.

ISBN: (纸本)9781622763153

Integrating large amount of low-inertia and intermittent renewable generation into the power system has increased the occurrence probability of power system imbalance brought about by large disturbances in short time scale and reduced the control capability of the power system under those disturbances. The continually increased electric vehicles (EVs) connected to the power grid may be capable of responding to those disturbances and contributed to the power balance by utilizing the fast-response, continuously regulating and power decoupling control capability of the power electronic charging interfaces. In this paper, different control schemes have been proposed to respond to the disturbances originated from distribution systems and the transmission systems respectively by regarding the electric vehicles as power support resources and considering the characteristics of the distribution network. A typical 11-kV 38-node system has been presented and tested to validate the effectiveness of utilizing the electric vehicles as power balance control resources and the related control schemes.

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A control strategy of three-phase voltage-sourced PWM rectifier

A control strategy of three-phase voltage-sourced PWM rectif...

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2011 International Conference on Electrical Machines and Systems, ICEMS 2011

作者： Wang, Ende Huang, Shenghua State Key Laboratory Ratory of Advanced Electromagnetic Engineering and Technology China

ISBN: (纸本)9781457710445

The double closed loops control strategy composed of inner current loop and outer voltage loop in the d-q synchronous frame is a relatively common control strategy of the three-phase voltage-sourced PWM rectifier. The system can not be completely decoupled because of the variable inductance in the actual system. And for simple, the decoupled part of the controller is usually ignored. What's more, the equation of the outer voltage loop is nonlinear. According to the analysis of the model of the rectifier, a novel double closed loops control strategy composed of inner current loop in the complex vector and outer square of the voltage loop, is proposed. The inner current loop using the mentioned control strategy can be completely decoupled without the exact value of the boost inductance, and the equation of the outer square of the voltage loop is linear. From the results of the simulation, the mentioned control strategy can greatly improve the dynamic and static of the system. © 2011 IEEE.

关键词： Inductance

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The key technology of distribution transformer and static var compensator integration system

The key technology of distribution transformer and static va...

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2011 International Conference on Mechatronic Science, Electric engineering and Computer, MEC 2011

作者： Xiong, Qing Zhang, Zhe Yin, Xianggen State Key Laboratory of Advanced Electromagnetic Engineering and Technology China China

ISBN: (纸本)9781612847221

Towards the reactive compensation feature of distribution network and integral substation, this paper proposed an integration structure of distribution transformer and STATCOM (DT-STATCOM). It use the surplus capacity of transformer to compensate the reactive power;by setting the connect voltage flexible, it extended the switching devices selection;the integration structure reduce the volume and cost of compensation device. Based on the structure of DT-STATCOM, this paper proposed two novel reactive current detection method across the transformer's ports. Then the paper designed the decision control system using multi-lateral information. Simulation result showed that, the DT-STATCOM system had significant effect on dynamic reactive power compensation, transformer voltage support and imbalance inhibition. © 2011 IEEE.

关键词： Reactive power

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Observation of Hot Electrons in Surface-Wave Plasmas Excited by Surface Plasmon Polaritons

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Chinese Physics Letters 2011年第11期28卷 162-165页

作者： HU Ye-Lin CHEN Zhao-Quan LIU Ming-Hai HONG Ling-Li LI Ping ZHENG Xiao-Liang XIA Guang-Qing HU Xi-Wei College of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074 State Key Laboratory of Structure Analysis for Industrical Equipment Dalian University of TechnologyDalian 116024

The electron energy distribution functions(EEDFs)are studied in the planar-type surface-wave plasma(SWP)caused by resonant excitation of surface plasmon polaritons(SPPs)using a single cylindrical *** plasma characteristics can be considered as a bi-Maxwellian EEDF,which correspond to a superposition of the bulk low-temperature electron and the high-energy electron beam-like *** beam component energy is pronounced at about 10 eV but the bulk part is lower than 3.5 *** hot electrons included in the proposed plasmas play a significant role in plasma heating and further affect the discharge chemistry.

关键词： beam Electron resonant

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Effects of Macroparticle Sizes on Two-phase Mixture Discharge Under DC Voltage

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中国电机工程学报 2012年第13期32卷 I0020-I0020,203页

作者： YAO Wenjun HE Zhenghao DENG Heming WANG Guoli ZHANG Man MA Jun LI Jin YE Qizheng HU Hui State Key Laboratory of Advanced Electromagnetic Engineering and Technology （Huazhong University of Science and Technology） Research Institute of China Southern Power Grid Co. Ltd. Guangzhou Branch EHV Power Transmission Company China Southern Power Grid

随着放电等离子体在各个领域应用的不断扩大，两相体放电问题越来越重要，需要解决的基础问题之一即是两相体中放电发生、发展的特点和规律及影响因素。采用21种不同的介质材料研究直流电压下两相体放电的效应，由实验结果可知介质的介... 详细信息

随着放电等离子体在各个领域应用的不断扩大，两相体放电问题越来越重要，需要解决的基础问题之一即是两相体中放电发生、发展的特点和规律及影响因素。采用21种不同的介质材料研究直流电压下两相体放电的效应，由实验结果可知介质的介电常数对放电路径基本无影响，而介质颗粒的粒径大小对两相体放电路径的选择起决定作用，即粒径效应。此外，对颗粒介电常数、电场畸变、光电离作用和颗粒荷电等几个方面进行研究，可知两相体放电的粒径效应与颗粒粒径大小紧密相关。

关键词：两相混合物粒子大小直流电压宏观放电高压输电线路排放法规外部绝缘

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