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Investigation of anti-welding performance of nanocrystalline CuCr25 contacts in vacuum 5

Investigation of anti-welding performance of nanocrystalline...

引用

5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Liu, Jinyou Wang, Qian Zhao, Laijun Yang, Xiaocheng Li, Zhenbiao Wang, Danjiang Cai, Bingbing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

To investigate the anti-welding performance of Nanocrystalline CuCr25, Microcrystalline CuCr25 material was set as comparison group, electrical endurance tests were conducted in the vacuum analog device under the condition of 42V/10A DC. Then the contact surface degradation is analyzed by using FESEM. Experimental result indicates that Nano-contacts have better anti-welding performance than Micro-contacts. The Variation tendency of break arc duration is summarized, and the mechanism of that Nano-contacts have better anti-welding performance is discussed from different aspects, including surface morphology and the elements analysis of the fusion zones.

关键词： Binary alloys

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Simulation on phase angle difference between voltage of metering port and bus of 220kV CVT 5

Simulation on phase angle difference between voltage of mete...

引用

5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Cai, Bingbing Liu, Chun Wang, Danjiang Cui, Zhiming Wang, Qian Li, Zhenbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

In order to study how parameters of CVT affect the phase angle difference between Voltage of Metering Port and Bus Voltage, an EMTP model with actual parameters of a 220kV CVT was established to simulate how some parameters affect the phase angle difference, such as value of voltagedividing capacitors and its dielectric loss, ratio of transformer, coil turns of compensation reactor and the load. The result is shown as followed: (1) The increasing dielectric loss of high voltage capacitor will make phase angle difference decrease significantly, while the increasing dielectric loss of medium voltage capacitor will make phase angle difference increase significantly;(2) Decrease of the ratio of transformer will make phase angle difference increase a little;(3) Increase of capacity and power factor of load will make phase angle difference decrease. These results are available to CVT testing online.

关键词： Dielectric losses

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Efficient Modeling of Cascaded-Multilevel Static Synchronous Compensator on Electronicmagnetic Transient Simulation Program

Efficient Modeling of Cascaded-Multilevel Static Synchronous...

引用

International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

作者： Zilong Xiao Dan Wang Qing Xiong Chengxiong Mao Jiming Lu Linglong Cai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Cascaded-Multilevel STATCOM (CM-STATCOM) is of great development potential in reactive power compensation device. But it consists of large number of semiconductor devices which significant increases the simulation time in electromagnetic transient simulation program. This paper proposes an efficient model of CM-STATCOM based on Dommel algorithm, which replaces the arm circuit with Thevenin equivalent circuit and numerical calculation block. This paper also introduces ideal switching devices to reduce computation quantity in calculation block. The proposed model that preserves the individual identity of H-bridge and interface to control system is of wide applicability and high accuracy. Besides, the size of nodal admittance matrix is reduced by several orders of magnitude so that the simulation time is reduced drastically. The proposed model is validated in PSCAD/EMTDC under different condition by comparisons with traditional model.

关键词： Cascaded-Multilevel STATCOM (CM-STATCOM) efficient modeling Dommel algorithm Thevein theorem electromagnetic trasient (EMT) simulation

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Optimal Design of Flux-barrier to Improve Torque Performance of IPMSM for Electric Spindle

Optimal Design of Flux-barrier to Improve Torque Performance...

引用

International Conference on Electrical Machines and Systems

作者： Zhicheng Pan Kai Yang Xiaojie Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479988068

This paper presents an optimal design of interior permanent magnet synchronous machine (IPMSM) for electric spindle considering the flux-barrier shape. Four types of flux-barrier are discussed and compared to improve torque performance, which includes the average torque, torque ripple and cogging torque. The design process is accomplished by using finite element method (FEM). Moreover, the Taguchi method is taken into practice in this paper as a proposed optimal method. The simulation results will be theoretically discussed and analyzed. Finally, prototype machines are being fabricated, and the validity of the proposed design will be confirmed by experiments.

关键词： FEM IPMSM Optimal Design

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A highly reliable online monitoring and real-time alarm system for the insulation condition of power transformers

A highly reliable online monitoring and real-time alarm syst...

引用

2014 International Conference on Mechatronics and Intelligent Materials, MIM 2014

作者： Sun, Wen Xing Li, Zhao Hui Cheng, Shi Jie State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351412

Many successful applications for the online monitoring of the insulation condition for electric power transformers have been reported over last thirty years. However, false or unsolved alarms have been quite frequently generated by those condition monitoring systems. Failures and some occasionally catastrophic accidents involving transformers have still occurred. A highly reliable insulation condition online monitoring and real-time alarm system has been developed, to help resolve these problems. An electric power transformer has strongly linked mechanical, electrical, magnetic, chemical and thermal characteristics, and is also directly linked to circuit breakers and generators. Team Intelligence (TI) was employed to integrate all the monitoring modules of the various different aspects of the transformer into one unique system. This system could also be integrate with the condition monitoring systems of various linked facilities, such as the monitoring systems of the turbine and the generator in a Optimal Maintenance Information System for Hydropower Plant (HOMIS). Highly reliable monitoring and real-time alarms of transformer insulation condition could be achieved, due to highly coordinated and rapid response features. This system has been deployed in several hydropower plants. The industrial application examples are demonstrated. © (2014) Trans Tech Publications, Switzerland.

关键词： Electric circuit breakers

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A Novel Triple-Rotor Axial-Flux Vernier Permanent Magnet Machine

A Novel Triple-Rotor Axial-Flux Vernier Permanent Magnet Mac...

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IEEE International Conference on Applied Superconductivity and electromagnetic Devices

作者： Rui Zhang Jian Li Rong Hai Qu Da Wei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781467381086

Vernier permanent magnet (VPM) machines are obtaining more and more attentions due to their high torque density and low torque ripple in recent years. However, they suffer from low power factor compared with conventional PM machines. In this paper, a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine is proposed to improve the power factor of conventional VPM machines to a reasonable level as well as maintaining high torque density and adequate speed range. Both Quasi-3D finite element Analysis (FEA) and 3D-FEA are employed to investigate the performances, such as power factor, torque density and torque ripple of the proposed machine.

关键词： High power factor Torque density Quasi-3D FEA Vernier machine

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Design and Analysis of a Novel Vernier Reluctance Fully Superconducting Synchronous Generator with LTS Windings for Wind Power Generation

Design and Analysis of a Novel Vernier Reluctance Fully Supe...

引用

IEEE International Conference on Applied Superconductivity and electromagnetic Devices

作者： Shao Feng Jia Rong Hai Qu Jian Li Hai Yang Fang Da Wei Li Jing Xuan Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781467381086

In this paper, a novel vernier reluctance fully superconducting synchronous generator (FSCSG) with low temperature superconductors (LTS) for wind power application is proposed. The feature of this superconducting generator is an external rotor structure, and both the superconducting armature windings and DC field windings are in the inner stationary stator. Thus, compared with the existing FSCSFGs, the cryostat and related refrigerate system of the proposed generator is greatly simplified. Besides, the results shows that the torque density is about 37% higher and the torque ripple is as low as 6.9% without any optimization and skewed.

关键词： Stator DC field winding Vernier reluctance machine Fully superconducting generator Low temperature superconductors

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Electrode Materials: A Hierarchical N/S‐Codoped Carbon Anode Fabricated Facilely from Cellulose/Polyaniline Microspheres for High‐Performance Sodium‐Ion Batteries (Adv. Energy Mater. 6/2016)

引用

advanced Energy Materials 2016年第6期6卷

作者： Dingfeng Xu Chaoji Chen Jia Xie Bao Zhang Ling Miao Jie Cai Yunhui Huang Lina Zhang College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 P. R. China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

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Power system optimal dispatch under low-carbon economy with significant photovoltaic generation

Power system optimal dispatch under low-carbon economy with ...

引用

2014 IEEE International Workshop on Intelligent Energy Systems, IWIES 2014

作者： Hu, Bin Lou, Suhua Wu, Yaowu Lu, Siyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province China

ISBN: (纸本)9781479958573

Photovoltaic (PV) generation does not produce CO2 emissions during operations. Developing PV generation is an effective way of developing a low-carbon electricity system. However, PV power output has the stochastic nature. It brings uncertainty to traditional power system dispatch problems. Based on the concept of low-carbon economy, this paper introduces carbon trading mechanism into power system dispatch first. Then, a probability distribution model of solar irradiance and PV power output is established, and risk reserve based on chance constrained programming is used to deal with the stochastic nature of PV power output. On this basis, an optimal dispatch model under low-carbon economy with significant PV generation is proposed. With the system generation cost, carbon trading cost and load shedding penalty incorporated in the objective function, the model proposed can effectively evaluate the power dispatch problem under low-carbon economy with significant PV generation. Finally, a 10-unit test system is simulated by applying the proposed model. © 2014 IEEE.

关键词： Stochastic systems

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Research of power flow distribution evenness based on entropy

Research of power flow distribution evenness based on entrop...

引用

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

作者： Jin, Bing Jie Zhang, Bu Han Wang, Ke Deng, We Isi Zeng, Dan Zhang, Kai Min Shao, Jian Ge, Teng Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Nanjing China

ISBN: (纸本)9783038351368

Research of power flow evenness has great significance for grid steady state analysis. This paper researched for a method for power flow evenness analysis through entropy theory. According to current power flow distribution and branch power limits, the branch load ratio distribution could be obtained, and the power flow entropy was calculated based on discrete information entropy theory. The study case indicates that the power flow entropy effectively describes the power flow evenness. With certain system load level, the system security level will be dramatically declined when power flow evenness reduces to a certain level, which is demonstrated in the case meanwhile. Power flow evenness analysis based on entropy theory is applicable in power system static security assessment. © (2014) Trans Tech Publications, Switzerland.

关键词： Electric load flow

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