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10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Mohammed Elbabo Mohammed, Omer Xu, Wei Liu, Yi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China Department of Electrical Engineering University of Sinnar Sinnar Sudan

ISBN: (纸本)9781479973118

This paper proposes a control method for standalone operation of the brushless doubly-fed induction generator (BDFIG) under unbalanced loads. The unbalanced loads will lead to unbalanced power winding (PW) voltage, which can be divided to the positive- and negative-sequence voltages. In the proposed control method, the positive-sequence voltage is controlled by using the direct voltage control (DVC) method. The negative-sequence voltage is eliminated by adding compensation loop to the machine side converter (MSC). The effectiveness of the proposed control method is validated by the simulation and experimental results. © 2018 IEEE.

关键词： Asynchronous generators

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Impact Stress Analysis and Structural Optimization Design of Thomson Coil Actuators

Impact Stress Analysis and Structural Optimization Design of...

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IEEE Electronic Power Grid (eGrid)

作者： Zhexiao Zhu Zhao Yuan Lixue Chen Ming Xu Junlei He Junjia He Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Ministry of Education Wuhan Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

Thomson Coil (TC) actuators are widely used in the field of mechanical switches by its ultra-high speed. In this paper, a multi-physical coupling model of the TC based on finite element (FE) analysis is established, and the armature flexing and its effect on structural strength are analyzed. It is found that increasing the thickness of armature, the radius of round table and radius of chamfering could increase the natural vibration frequency of the system, thus reducing the stress value and vibration amplitude. It is also shown that the distribution and pulse width of repulsive force have little effect on the stress, while the peak value of repulsive force plays a decisive role. The simulation results show a good accuracy compared with experimental results to verify the validity of these conclusions. The numerical calculation method could be used to guide engineering design.

关键词： Stress Force Actuators Vibrations Simulation Iron Strain

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Impact mechanism of turbine control of DFIG-based wind turbines on damping of power system oscillations

Impact mechanism of turbine control of DFIG-based wind turbi...

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8th Renewable Power Generation Conference (RPG 2019)

作者： Xiaojie Zhang Wei He Jiabing Hu Longfei Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid Zhejiang Electric Power Research Institute Hangzhou China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The penetration of doubly fed induction generator (DFIG)-based wind turbines (WTs) is suspected to have some impacts on power system oscillations. In order to find out the relationships, several models have been established in previous studies. However, those models mostly overlooked the influences of the turbine control of WTs, including maximum power point tracking (MPPT), pitch control, and speed control. This paper proposes a new DFIG-based WT model, which enables further research on the impact rules and mechanisms of turbine control on the damping of power system oscillations. In detail, a linearized WT model, which can explicitly describe the external characteristics of WTs, is first derived. With the aid of this model, the differences introduced by the MPPT and the pitch compensation under different operation areas are compared. Finally, the impact rules and mechanisms of DFIG-based WT on power system oscillations are clearly explained through the interaction analysis based on the proposed model and the model of synchronous generators (SGs).

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Research on on-line ice-melting technology based on zero sequence reactance integrated device

Research on on-line ice-melting technology based on zero seq...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yabing Zhou Xiaoliang Tang Yuning Hou Fang Yang Haifei Wang Tingkang Wang Qingyuan Power Supply Bureau China Southern Power Grid Corporation Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728133997

In this paper, the grounding transformer is matched with the adjustable reactor, and the zero-sequence loop is formed by the lightning protection line. The intelligent switching of the knife gate is used to realize the flexible switching between the melting ice state and the non-melting ice state. When melting ice, switch to online melting ice. The device realizes the continuous adjustment of the melting current by adjusting the gear position of the adjustable reactor; during the non-melting ice, switching to the neutral point non-effective grounding system does not affect the original power grid structure, and at the same time melting the ice During operation, it does not affect the voltage and current on the load side, thus achieving a new idea of non-stopping and melting ice.

关键词： On-line melting ice Adjustable reactor Intelligent switch Grounding transformer Single phase short circuit load side Ice zero sequence Melting Ice melting grid structures integrated device (electronics) reactance Psychological Reactance FLEXIBLE VOLTAGE

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Observation of nonreciprocal magneto-optical scattering in nonencapsulated few-layered CrI3

arXiv

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arXiv 2020年

作者： Guo, Kai Liu, Zhen Hu, Guangwei Shi, Zhongtai Li, Yue Zhang, Linbo Chen, Haiyan Zhang, Li Zhou, Peiheng Lu, Haipeng Lin, Miao-Ling Liu, Sizhao Cheng, Yingchun Liu, Xue Lu Xie, Jianliang Bi, Lei Tan, Ping-Heng Deng, Long jiang Qiu, Cheng-Wei Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore Key Laboratory of Flexible Electronics Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing211816 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences P. O. Box 912 Beijing100083 China

"Magneto-optical" effect refers to a rotation of polarization plane, which has been widely studied in traditional ferromagnetic metal and insulator films and scarcely in two-dimensional layered materials. Here we uncover a new nonreciprocal magneto-inelastic light scattering effect in ferromagnetic few-layer CrI3. We observed a rotation of the polarization plane of inelastic light scattering between -20o and +60o that are tunable by an out-of-plane magnetic field from -2.5 to 2.5 T. It is experimentally observed that the degree of polarization can be magnetically manipulated between -20% and 85%. This work raises a new magneto-optical phenomenon and could create opportunities of applying 2D ferromagnetic materials in Raman lasing, topological photonics, and magneto-optical modulator for information transport and storage. © 2020, CC BY-NC-SA.

关键词： Ferromagnetic materials

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Design and implementation of the resonant magnetic perturbations feedback control system for tearing mode suppression on J-TEXT

Design and implementation of the resonant magnetic perturbat...

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作者： Zheng, Wei Hu, Feiran Zhang, Ming Li, Da Hu, Qiming Jin, Hai Rao, Bo Yan, Minxiong Pan, Yuan Yu, Kexun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Tearing modes (TMs) degrade the performance of tokamak plasma, and can even lead to disruption. Using externally exerted resonant magnetic perturbations (RMPs) to suppress TM is a promising and effective way. In order to suppress the 2/1 TM, 2/1 RMP must be applied in given phase regions to stabilize magnetic island and accelerate island rotation. The RMP feedback control system acquires the multiple-channel poloidalMirnov signal, processes the acquired data and calculates the magnetic island phase in real time, and switches on the RMP power supply when the phase is in the designated region. The feedback control system is based on NI cRIO and developed mainly using LabVIEW field-programmable gate array. The typical 2/1 mode magnetic island on J-TEXT rotates at a frequency from 2 to 10 kHz. To ensure the control precision within 2°, the control period must be within 500 ns. Due to the noisy characteristic of the Mirnov signal, the feedback control system uses a series of error correction methods in real time to obtain accurate phase. Various control strategies have been adopted to exploit the RMP coil and power supply. Observable result is presented in this paper. © 1963-2012 IEEE.

关键词： Feedback control

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Medical applications of nonthermal atmospheric pressure plasma in dermatology

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JDDG - Journal of the German Society of Dermatology 2018年第1期16卷 7-14页

作者： Gan, Lu Zhang, Song Poorun, Devesh Liu, Dawei Lu, Xinpei He, Mengwen Duan, Xiaoru Chen, Hongxiang Dermatology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Plasma ist ein ionisiertes Gas, das aus positiv und negativ geladenen Teilchen, neutralen Atomen und Photonen zusammengesetzt ist. Neueste Entwicklungen bei Plasmaquellen haben es möglich gemacht, Plasma in Raumtemperatur „open air“ zu erzeugen und so die Anwendung von Plasma in vivo zu ermöglichen. Bei der Verwendung von nicht-thermischem Plasma können die Wirkstoffe effektiv an die Zielzellen verbracht werden, ohne thermischen Schaden zu verursachen. Nicht-thermisches Atmosphärendruck-Plasma, auch bekannt als kaltes Atmosphärendruck-Plasma (cold atmospheric pressure plasma, CAP), ermöglicht innovative medizinische Anwendungen und hat diesbezüglich auch in der Dermatologie große Aufmerksamkeit erlangt. Die komplexe und variable Mischung der Wirkstoffe im Plasma - überwiegend reaktive Sauerstoff- und Stickstoffspezies (ROS, RNS) - können komplexe biologische Reaktionen steuern oder auslösen und so die gewünschten Wirkungen dosisabhängig erzielen. Ziel dieser Übersichtsarbeit ist es, potenzielle dermatologische Anwendungen von Plasma darzustellen und seine möglichen Wirkmechanismen zu analysieren.

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Research on Overload Capability of Oil-immersed Distribution Transformer Based on Hot Spot Temperature Model

Research on Overload Capability of Oil-immersed Distribution...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Haifei Wang Manyu Xue Tingkang Wang Yuning Hou Jianchun Chen Jianming Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Railway Fourth Survey and Design Institute Group Company Limited Wuhan China

ISBN: (纸本)9781728133997

As the user load continues to increase, the safety accidents caused by the overload of the transformer frequently occur. In order to improve the safety and stability of the transformer operation, this paper conducts an in-depth study on the overload capability of the transformer based on the hot spot temperature model. When the oil-immersed distribution transformer is overloaded, the internal temperature of the transformer rises, causing insulation aging and reducing the service life. This paper first introduces the characteristics of distribution transformers in different types of loads, and analyzes the changes occurring inside the transformers during overload operation, and then based on the hot water temperature calculation model in GB/T 1094. 7-2008 standard, from the perspective of operating temperature and heat aging, The research and analysis of the overload capacity of the distribution transformer is carried out, and the relationship between the allowable overload time of the transformer and the allowable overload multiple is obtained, and the theoretical analysis of the life loss is made.

关键词： Oil insulation Power transformer insulation Oils Temperature distribution Current transformers Aging

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laboratory Investigation on Phase Selection Closing Approach for Suppression of Inrush Current

Laboratory Investigation on Phase Selection Closing Approach...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Congwen Wu Wei Chen Wei Xi Hao Yao Deshu Chen The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China EPRI China Southern Power Grid Co.Ltd Guangzhou China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

During the no-load closing process, transformer will produce a magnetizing inrush current which will make the transformer relay malfunction and make adversely affect to the transformer equipment and power grid. Relative to a variety of external measures limiting the inrush current, the phase selection switch technology is more effective to reduce inrush current. The author analyzed inrush current by theory and dynamic simulation experiment. By controlling the closing angle to be less than 0° to 72° of the opening angle, inrush current is well suppressed.

关键词： Surges Magnetic hysteresis Remanence Surge protection Circuit faults Magnetic flux Magnetic cores

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A two-layer control method for inverter ACs to provide frequency regulation service based on indoor temperature-varying model

A two-layer control method for inverter ACs to provide frequ...

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8th Renewable Power Generation Conference (RPG 2019)

作者： Kaiwen Zeng Jianing Liu Lingling Le Menglin Zhang Xiaomeng Ai Guangdong Power Grid Power Dispatch Control Center Guangzhou 510600 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The frequency regulation service is playing an increasingly important role in the power system with high penetration of renewable energy integration. Since the inverter air-conditions (ACs) could change the operating power continuously and the indoor temperature of the buildings fluctuate slightly with a short-term power change, inverter ACs are considered as important demand response to the frequency regulation service. In this paper, the equivalent thermal parameter model of an inverter AC is introduced and the indoor temperature-varying model is established. Then, in order to improve the regulation capacity, a two-layer control method considering a virtual AGC generator to conduct grouping coordination control over the AC aggregators is proposed to provide frequency regulation service based on the indoor temperature-varying model. Simulation results demonstrate that the control method has improved the total frequency regulation capacity of the AC aggregators and the inverter ACs have a good performance in providing the frequency regulation service under the two-layer control method.

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