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Instantaneous compensation strategy of DC voltage component in the digital-analog integrated simulation interface

Instantaneous compensation strategy of DC voltage component ...

引用

International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Linglong Cai Chengxiong Mao Jie Zeng Dan Wang Jiming Lu Zilong Xiao Junlin Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute of Guangdong Power Grid Co. Ltd. Guangzhou China School of Electrical & Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Digital-Analog integrated simulation combines the advantages of digital simulation with the advantages of physical simulation. The applicability of traditional simulation system is increased. The DC component of output voltage restricts the versatility of Digital-Analog integrated simulation. Unlike general inverters, the inverter of Digital-Analog integrated simulation interface (DAISI) has its unique features. A new control strategy is put forward to restrain the steady and transient DC component without additional hardware circuit. The feedback control loop along with the output voltage control loop adjust the duty cycle of sinusoidal pulse width modulation which compensate for the DC voltage component in the DAISI. Simulation and experiment verify the effectiveness of the control strategy.

关键词： Inverters Digital-analog conversion Voltage control Transient analysis Inductors Integrated circuit modeling Capacitors

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

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

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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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Improving actuated strain at low electric field of dielectric elastomers by using some new methods

Improving actuated strain at low electric field of dielectri...

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2015年全国高分子学术论文报告会

作者： Ming Tian Nanying Ning Qin Ma Bingyue Yan Yang Yao Liqun Zhang Beijing University of Chemical Technology State Key Lab of Organic-Inorganic Composites Beijing University of Chemical Technology College of Materials Science and EngineeringCenter of Advanced Elastomer Materials

Dielectric elastomer actuators(DEAs) can give rise to surprisingly large deformations by applying an electric field, thus have been receiving much attention in the past two decades. Owing to its fast response, lightweight, large strain, and high energy density, DEs find many applications in industry such as artificial muscles and sensors. Getting a large actuated strain at a low electric field is the biggest challenge for DEs. In this study, some new methods were used to improve the actuated strain at a low electric field of DEs. The first one is the preparation of DE with large actuated strain at a low electric field by the ionic conductivity of polyethylene glycol( PEG) and the disruption of hydrogen bonds in thermoplastic polyurethane(TPU) chains. The second one is the preparation of an seperated structured all-organic dielectric elastomer with large actuation strain under ultralow-voltage and high mechanical strength. The third one is the preparation of XNBR dielectric composite with high dielectric constant, low dielectric loss and large actuated strain at a low electric filed by the latex compounding of XNBR and GONS-encapsulated carbon nanosphere(GO@CNS) hybrids followed by in-situ thermal reduction of GO@CNS at a low temperature. The mechanisms of these new methods, the dielectric properties of the as-prepared DE materials, and the structure-property relationship are carefully studied.

关键词： Dielectric elastomers(DEs) actuated strain hydrogen bonds Beijing University of Chemical technology

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Research of power flow distribution evenness based on entropy

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

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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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A probabilistic load flow method based on markov chain wind power prediction

A probabilistic load flow method based on markov chain wind ...

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

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

ISBN: (纸本)9783038351344

With the wind power installed capacity increased, it brings great challenges to the stable operation of the power grid. In order to take consideration of the wind power impact, this paper proposes a wind power variability model applied to the probabilistic load flow calculation using the method of combined cumulants and improved Von-Mises Expansion. This wind power variability model combines the concept of Markov chain process and scenario tree theory, taking in to account the relationships of the outputs of wind turbines at adjacent moment by considering the coupling interaction at different time intervals. Computer simulations verify the effectiveness and applicability of the proposed method through IEEE bus-39 New England case study. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind turbines

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A battery-operated atmospheric-pressure plasma wand for biomedical applications 41

A battery-operated atmospheric-pressure plasma wand for biom...

引用

41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014

作者： Lu, Xinpei Pei, Xuekai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China

ISBN: (纸本)9781479927111

In the past decade room-temperature atmospheric pressure plasma jets (RT-APPJs) have attracted a lot of attention due to their applications in the field of health care and medicine, including bacteria inactivation, blood coagulation, wound healing, teeth whitening, and tooth root canal treatment. To fulfill the specific requirements of various applications, many different types of RT-APPJs with different designs and driven by different power sources, including kHz AC, RF, microwave, pulsed DC and DC voltages, have been developed. On the other hand, external power sources (e.g., wall power or power generator) are needed for all these devices. In addition, most of these devices also need gas supply (e.g., He, Ar). Furthermore, for applications where bacteria, fungi, or viruses are hidden in narrow channels such as nasal cavity and ear canal, most of the currently available devices are not suitable for such situations. In this paper, a handheld, battery operated atmospheric pressure plasma rod (named plasma wand) which does not rely on external power source (e.g., wall power or power generator) and gas supply is reported. The plasma wand can be used for killing bacteria, fungi, or viruses that are hidden in narrow channels such as nasal cavity and ear canal, which are difficult to access using most of currently available devices. Besides, the electrical characterization, plasma wand temperature, emission spectra of the plasma, ozone and OH radical concentration generated by the device, are investigated by different diagnostic methods. The ozone concentration reaches 120 ppm at 1 mm away from the device and the OH concentration reaches 3.5¡Á1014 cm-3 in the plasma. The preliminary bacteria inactivation experiment results show that all bacteria samples on the microfiltration membrane are killed by this device within 30 s.

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The impact of charging plug-in electric vehicles on distribution system considering spatial and temporal distribution

The impact of charging plug-in electric vehicles on distribu...

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

作者： Wang, Dong Hua Mao, Cheng Xiong Wang, Min Wei Lu, Ji Ming Fan, Hua Wang, Dan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

ISBN: (纸本)9783038351344

The plug-in electric vehicles (PEVs) would exert inevitable impact on distribution system operation due to the spatial and temporal stochastic nature of the charging load. Based on the probability distributions of battery charging start time and the initial state-of-charge (SOC), the spatial and temporal charging loads of PEVsare analyzed on load nature and charging behaviors among different functional distribution areas. Taking IEEE 33-bus distribution system as an example, the Monte Carlo method is adopted to simulate charging load under different charging strategies and charging places for assess the impact on network loss and nodal voltage using standard load flow calculations. The results show that the choice of control strategies can improve the impacts of PEVs charging on distribution grid;a well-developed public charging infrastructure could reduce the stress on the residential distribution systems;optimal assignment of PEVs charging in residential area and industrial or commercial areas would provide a reference for charging infrastructure construction. © (2014) Trans Tech Publications, Switzerland.

关键词： Plug-in electric vehicles

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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)

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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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