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The establishment of wind farm dynamic Co-simulation platform and influence analysis of wind conditions

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 356-364页

作者： Zhuo, Yixin Xu, Lüyang Lin, Xiangning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

With the development and utilization of wind power, wind turbine trip-off and damage accidents has occurred frequently because of the severe wind conditions, having adverse impacts on the stability and safety operation of power grid. Therefore, it is necessary to establish an appropriate model for wind farm operation analysis considering various wind conditions. Through combining on Digsilent and Matlab, this paper established a dynamic wind farm simulation platform with three parts of wind condition, wind turbine and fatigue respectively. Based on this platform, a variety of standard wind conditions with wake effects can be formulated, and their electric influence and fatigue damage on wind turbines can be analyzed in detail. The simulation platform is validated through a demo wind farm, and the influence of wind conditions is evaluated. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Wind turbines

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Welding behavior in making and breaking operations of electrical contacts 27

Welding behavior in making and breaking operations of electr...

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27th International Conference on Electrical Contacts, ICEC 2014

作者： Wang, Qian Liu, Chun Wu, Xixiu Li, Zhenbiao Du, Liu Liu, Jinyou Yang, Xiaocheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Automation Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783800736249

To clarify where the exact position of dynamic welding occurrence is, electrical endurance tests are conducted with AgSnO2, AgNi and AgCdO contacts. Waveforms of contact force, displacement, voltage and current are recorded with Labview during tests, which can make it out whether welding occurs during breaking or making operation. The experimental results shows welding may occur in breaking as well as in making operations, possible mechanism for welding in break is discussed. © 2014 VDE VERLAG GMBH. All rights reserved.

关键词： Welding

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Analysis of the asymmetry of railgun system 17

Analysis of the asymmetry of railgun system

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2014 17th International Symposium on electromagnetic Launch technology, EML 2014

作者： Zizhou, Su Wei, Guo Tao, Zhang Kai, Huang Ming-Tao, Li Xiaochao, Sun Northwest Institute of Mechanical and Electrical Engineering Xian yang Shaanxi712099 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479927333

The reasons and the performance of the dissymmetry of the armature-rail system were studied. The current distribution and its force the dissymmetry of Armature or rail in C-shaped armature were analyzed by finite-element method. The calculation was performed with a monolithic armature. As a preliminary study on the dissymmetry of Armature-rail system, a 40 mm square-bore railgun with an asymmetrical travel-length of 1800 mm was fabricated and tested. Launch experiments were conducted to verify the analysis results. The current density distribution and force in reclaimed armature was analyzed. It was found that the dissymmetry of Armature-rail system affect the performance of railgun. © 2014 IEEE.

关键词： Rail guns

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Analysis of the dynamic characters of C-shaped armature in railgun 17

Analysis of the dynamic characters of C-shaped armature in r...

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2014 17th International Symposium on electromagnetic Launch technology, EML 2014

作者： Zi-Zhou, Su Wei, Guo Tao, Zhang Wei, Fan Bo, Zhang Zhi-Qiang, Dong Bin, Cao Northwest Institute of Mechanical and Electrical Engineering Xian yang Shaanxi712099 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479927333

In order to obtain the dynamic characteristics of C-shaped armature, the finite element software Ansoft was used to model the C-shape armature of simple square-bore railgun based on the assumption of no disjunction and ideal complete contact between the armature and rail. Five types of armature, such as monolithic armature, whole chunked armature, forward-back chunked armature, up-down chunked armature and left-right chunked armature, the general and local mechanics characteristics were calculated and analyzed. The force exerted on the each part of the armature was discussed. The method of the optimal geometric structure for C-shaped armature was formed, which could provide the basic reference for the armature design. © 2014 IEEE.

关键词： Finite element method

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Design of the superconducting excitation winding for 12 MW direct-drive wind generator 2

Design of the superconducting excitation winding for 12 MW d...

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2nd International Conference on Renewable Energy and Environmental technology, REET 2014

作者： Su, Lu Shun He, Qing Shi, Jing Ren, L. He, Jie Jin, Tao Zhou, Shi Ping State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Testing and Research Institute of HBEPC WuhanHubei Province China

ISBN: (纸本)9783038352860

Due to the high JC of the superconductor, the volume and the weight of the generator can be significantly reduced if the superconducting coils are used. This paper has designed a 40-pole racetrack excitation winding for the 12MW offshore wind turbines generator. The excitation winding are wound by Nb-Ti superconductor, running at the temperature of 4.2K. In order to ensure the stability and reliability of the magnetic field, some optimizers for the design of the excitation winding are adopted. As a result, the fundamental magnetic field at the air-gap center of the armature winding could reach 2.1T, thereby the 12MW power generation could be achieved. © (2014) Trans Tech Publications, Switzerland.

关键词： Magnetic fields

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Oscillator death induced by amplitude-dependent coupling in repulsively coupled oscillators

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Physical Review E 2015年第5期91卷 052902-052902页

作者： Weiqing Liu Guibao Xiao Yun Zhu Meng Zhan Jinghua Xiao Jürgen Kurths School of Science Jiangxi University of Science and Technology Ganzhou 341000 People's Republic of China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Institute of Physics Humboldt University Berlin Berlin D-12489 Germany Potsdam Institute for Climate Impact Research Telegraphenberg Potsdam D-14415 Germany

The effects of amplitude-dependent coupling on oscillator death (OD) are investigated for two repulsively coupled Lorenz oscillators. Based on numerical simulations, it is shown that as constraint strengths on the amplitude-dependent coupling change, an oscillatory state may undergo a transition to an OD state. The parameter regimes of the OD domain are theoretically determined, which coincide well with the numerical results. An electronic circuit is set up to exhibit the transition process to the OD state with an amplitude-dependent coupling. These findings may have practical importance on chaos control and oscillation depression.

关键词： DYNAMICAL systems CHAOS synchronization PHASE transformations (Physics) LORENZ equations COUPLING constants (Nuclear physics) AMPLITUDE estimation

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Nonsingular Terminal Sliding Mode Control for Speed Regulation of Permanent Magnet Synchronous Motor with Parameter Uncertainties and Torque Change

Nonsingular Terminal Sliding Mode Control for Speed Regulati...

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International Conference on Electrical Machines and Systems

作者： Wei Xu Yajie Jiang Chaoxu Mu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Automation Engineering Tianjin University Tianjin China

ISBN: (纸本)9781479988068

This paper mainly studies the speed control for a permanent magnet synchronous motor (PMSM) system with parameters uncertainties and torque change. PMSM is a typical nonlinear multivariable coupled system, and is sensitive to the load disturbance and the changing of motor parameters. Hence, the drive performance of PMSM is deteriorated when faced with all kinds of disturbances. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is designed to replace the traditional sliding mode control (SMC) in this paper, which can provide effective control for the speed regulation of PMSM servo system with parameter uncertainties and torque change. The high performance in simulation results are proposed to verify the effectiveness of this proposed method.

关键词： PMSM NTSMC SMC

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Novel zero-voltage transition semi bridgeless boost PFC converter with soft switching auxiliary switch

Novel zero-voltage transition semi bridgeless boost PFC conv...

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作者： Hu, Wei Kang, Yong Wang, Xuehua Zhou, Xiaoning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Department of Engineering Research Wuhan Quanhua Optoelectronics Co. Ltd. Wuhan China

ISBN: (纸本)9781479956982

By using an active snubber, a novel implementation of the zero-voltage transition (ZVT) semi bridgeless boost power factor correction (PFC) converter is proposed. The active snubber reduces the reverse-recovery-related losses of the boost diodes and also provides zero-voltage switching (ZVS) for the main switches in the proposed converter. Furthermore, the auxiliary switch is operated at soft switching, the rest of the diodes are also realized to turn on and turn off naturally. Operating modes and optimal control strategy of the proposed converter are discussed in detail, and design of the proposed active snubber is given. On the basis of it, a prototype of 100 kHz, 600W, universal ac-line proposed circuit has been built to verify the proposed scheme. The efficiency curves show that the circuit improves efficiency significantly in the wide input voltage range and full power output. © 2014 IEEE.

关键词： Zero voltage switching

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Research on dynamic characteristics modeling of micro differential pressure sensor with magnetic fluid

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2015年 30卷 7-12页

作者： Liu, Xueli Yang, Qingxin Yang, Wenrong Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin300130 China Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin300387 China

The applications of magnetic fluid in sensor become more and more widely. As the theoretical research on the magnetic fluid sensors is more and more deeply, the research on dynamic performance is the key to its practical application. Based on the theory of fluid kinematics, the dynamic performance of micro differential pressure sensor with magnetic fluid has been analyzed considering the viscosity variation of magnetic fluid in the magnetic field in this paper. Besides, the coupling model of magnetic field and fluid field of micro differential pressure sensor has been built, and the simulation also has been carried out for the coupling model mentioned above, the simulation result and the theoretical result are consistent. According to the dynamic simulation research on the sensor, the theory for further sensor structure optimization and sensor accuracy enhancement is put forward. ©, 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

关键词： Magnetic fluids

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Research on peak load regulation demand of power system with large-scale wind power integration

Research on peak load regulation demand of power system with...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Xu, Jian Fei Shao, Jian Zhang, Bu Han Yu, Peng Zhang, Kai Min Jin, Bin Jie Ge, Teng Yu Dai, Xiao Kang Deng, Wei Si State Grid Jibei Electric Power Company Limited Beijing 100053 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351344

In china, increasing large-scale wind power integration has brought much more peak load regulation demand, which is the bottleneck of the integration of wind power to systems. This paper analyzed the influence mechanism of large-scale wind power on peak load regulation demand. And critical indicators are constructed based on the daily peak-valley difference to evaluate peak load regulation demand caused by wind power integration. Statistical analyses based on large number of actual dates reflect the influence of large-scale wind power integration on peak load regulation demand, which can help provide more decision-making information for planning and operation. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind power

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