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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Jianrui Liu Dong Jiang She Yan Pengye Wang Weiheng He Qihong Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China GD Midea Heating & Ventilating Equipment Co. Ltd. Advanced Research Center Foshan China

The motor drive system is a widely studied power electronics application, with significant attention given to its electromagnetic interference (EMI) issues. Passive EMI filters (PEFs), composed of inductors and capacitors, are commonly employed to mitigate EMI. However, the size and weight of conventional common mode inductors with high inductance tend to cause heating and power loss problems. An alternative solution is the implementation of active EMI filters (AEFs), which significantly reduce the inductance value of common mode inductors, resulting in a smaller filter size and improved power density and efficiency for the electric drive system. In this study, a hybrid EMI filter is designed for motor drive systems featuring certain ground parasitic common-mode (CM) capacitance. By optimizing the impedance relationship, the proposed filter effectively suppresses CM noise in the frequency range of 150 kHz to 1 MHz, achieving noise reduction of 20–30 dB.

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Optimal Scheduling of Battery Charging-Swapping Systems for Distribution Network Resilience Enhancement

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SSRN 2022年

作者： Sui, Quan Li, Feiyu Wu, Chuantao Feng, Zhongnan Lin, Xiangning Li, Zhengtian Wei, Fanrong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China

When offshore-island renewable distribution system (OIRDS) encounters multiple failures in case of extreme weather, battery charging-swapping system (BCSS) is a promising solution to reduce the power outage loss and enhance resilience of the OIRDS. However, extreme weather (such as heavy rain) may affect the logistic speed, resulting in a non-integer-hour battery schedule time among stations. Although rounding the time as integer hours could match the scheduling step size, result errors would be caused. To solve the problem, a novel OIRDS resilience enhancement strategy is proposed. First, the impacts of the rainfall, solar radiation, and wind speed on the renewable generation and battery transfer time are analyzed. On this basis, a dual unit commitment method is presented to coordinate the scheduling step and non-integer-hour battery transfer time. Moreover, an optimal OIRDS resilience enhancement model integrating decisions of the battery schedule and network reconfiguration is presented based on a 1-hour scheduling step. This model is converted into a mixed-integer linear programming (MILP) problem and solved efficiently. Simulation studies on an IEEE-11 node distribution network indicate the proposed strategy is effective and beneficial. © 2022, The Authors. All rights reserved.

关键词： Charging (batteries)

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Location of the space stem in long negative laboratory sparks

Location of the space stem in long negative laboratory spark...

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Asia-Pacific International Conference on Lightning (APL)

作者： Xiangen Zhao Yaping Du Lili Guo Yang Liu Junjia He Department of Building Environment and Energy Engineering The Hong Kong Polytechnic University Hong Kong China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

It is well known that the negative leader in the air develops in a stepwise manner, with each step originating from a space stem. However, the formation mechanism of a space stem remains unknown, leading to a blockage in the study on negative leader discharge. One of the main reasons is the lack of observations of space stems. For this reason, and as a continuation of our work, this paper focuses on the initiation location of the space stems. We have designed experimental conditions to enable space stem observation using a high-speed camera. Through processing the experimental images, it is found that the location where the space stems start to be formed may be located at the boundary of the previous corona streamer discharge, or inside the pre-corona streamer region, but at the edge of the intense discharge area. These findings may help to further Figure out the formation mechanism of a space stem in long negative sparks in the air.

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Optimal Capacity Planning and Analysis of a Sustainable Solar/Wind Microgrid in Rural Areas

Optimal Capacity Planning and Analysis of a Sustainable Sola...

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IEEE Green Technologies Conference (IEEE-Green)

作者： Zia Ullah Shaorong Wang Mohamed R. Elkadeem Kotb M. Kotb State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Electrical Power and Machines Engineering Department Faculty of Engineering Tanta University Tanta Egypt

Conventional power systems are generally not efficient, economical, and environmentally friendly due to the primary energy demand met by fossil fuels. It is imperative to design efficient and sustainable systems considering hybrid renewable energy sources; however, integrating RES into the system poses design and integration challenges. This paper proposes an optimal planning and analysis approach for the hybrid solar/wind microgrid system integrated with battery energy storage to maximize the technical, cost, and environmental benefits. The system modelling and simulation are implemented using HOMER Pro optimizer with a representative case study to supply rural residential households in Pakistan. We evaluated the proposed system’s performance and analyzed the penetration of renewable generation using real-time meteorological data. Moreover, multiple cases and scenarios were considered, compared, and investigated to prove the effectiveness and relevance of the proposed hybrid energy system. The simulation results and detailed comparisons show the proposed 100% renewable-based microgrid applicability and relevance to meet the load requirement at the lowest total net present cost ($226476.1) and energy costs (0.3523$/kWh), which were found to be 59.51% and 59.47% less than the diesel system.

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Analysis of Neural Spike Signal Transmission Characteristics in 3-D Heterogeneous Integration 13

Analysis of Neural Spike Signal Transmission Characteristics...

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13th Asia-Pacific International Symposium on electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Yu, Heyuan Sun, Zhe Lei, Xiaoyong Huo, Shuyun Li, Yan Fang, Lidan Xu, Shaojie Li, Erping Li, Bingheng Hebei University of Technology College of Electronics & Information Engineering Tianjin China China Ji-Liang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

With the continuous development of artificial intelligence, spiking neuromorphic chip is favored for its architectural advantages of memory computing integration. The neural spike signal is used as the transmission signal in the spiking neuromorphic chip, and its completely different characteristics from the digital pulse signal will inevitably lead to different signal integrity problems. In this paper, we model the common Through Silicon Via (TSV) and the interconnection structure model of redistribution layers (RDL) in 3-D heterogeneous integration, analyze the insertion loss and transient impedance of the two structures respectively, and finally perform time-domain transient simulations with neural spike signals of different rising edges in the two models to observe their transmission characteristics. The simulation results show that neural spike signals with shorter rising edges can generate more serious signal integrity problems such as loss, reflection, and delay in the RDL-TSV interconnection structure. © 2022 IEEE.

关键词： Time domain analysis

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The Motion and Distribution Characteristics of Cathode Spot and its Influence on Plasma Parameters

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SSRN 2023年

作者： Liu, Liming Liu, Shan Yuan, Zhao Chen, Lixue State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Ministry of Education Hubei Province Wuhan430074 China

Cathode spots and plasma are the key factors affecting the breaking capacity of vacuum switches. In order to analyze the motion and distribution characteristics of cathode spot and its influence on plasmas, the experiments of cathode spot observation and plasma diagnosis were conducted in this paper. The cathode spot images were captured by ultra high-speed camera. Based on the continuous spectrum theory, the electron density was measured by the colorimetric thermometry. According to the cathode spot images and method of cathode spot recognition, the parameters of cathode spots including number, size and current were obtained. The changes of these parameters with arcing time and current amplitude were analyzed. The dependence of the cathode spots average size on spot current and spot expansion velocity was discussed. The axial and radial distributions of electron density were obtained which is related to the cathode spot distribution on the cathode surface. The significant fluctuation in the radial direction for electron density was observed. © 2023, The Authors. All rights reserved.

关键词： Carrier concentration

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Spread Spectrum Modulation Strategy for Vienna Rectifiers to Reduce EMI and Switching Losses

Spread Spectrum Modulation Strategy for Vienna Rectifiers to...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Hui Liu Dong Jiang Shuyu Zhang Xuan Zhao Jianan Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China College of Electrical Engineering and Control Science Nanjing Tech University Nanjing China

The utilization of constant switching frequency pulse width modulation (CSFPWM) in the Vienna rectifier leads to the generation of numerous electromagnetic interference (EMI) spikes within its frequency spectrum. A sinusoidal spread spectrum modulation method is presented in this paper. When the maximum amplitude of three-phase current increases, the switching frequency decreases. On the basis of reducing EMI, the efficiency of the system is improved by reducing the switching loss. The experimental results show that compared with CSFPWM, sinusoidal PWM (SINPWM) can reduce the conducted EMI by 15dB.

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Small Disturbance Relationship with Internal-Voltage Amplitude/Frequency Excitation and Active/reactive Current Response and Its Linearization Method of AC Network for AC Power System Dynamic Analysis

Small Disturbance Relationship with Internal-Voltage Amplitu...

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Electrical engineering and Control Technologies (CEECT), Conference on

作者： Sicheng Wang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665499002

With the high penetration of renewable generations, increasingly serious impact of dynamics of AC network as an important part of power systems on system dynamic behaviors urgently asks for constructing corresponding small disturbance linearization relationship of AC network to achieve dynamic analysis for today's new system by applying mature linear system mathematics. However, due to the existence of AC signals in the network, relevant DC state variables and operating points required for establishing and linearizing small disturbance relationship are not intuitive. But existing researches almost have not yet understood appropriate state variables and operating points from the perspective of AC power systems' basic operation principle and physical connotation of system dynamics, causing there is still a lack of a universal construction idea and a general linearization method of the small disturbance relationship of AC network suitable for system dynamic analysis. Thus, system operation principle and physical dynamics are first concerned by taking a simplified converter interfaced power system as an example in this paper, and internal-voltage amplitude/frequency (A/F) and active/reactive (A/R) current are revealed as state variables and operating points of AC power systems. A universal construction idea of small disturbance relationship with internal-voltage A/F excitation and A/R current response of AC network and relevant linearization method are then proposed. Finally, small disturbance linearization relationship of a typical inductive transmission line is established and is validated by simulation.

关键词： Linear systems Technological innovation Renewable energy sources Voltage fluctuations Power transmission lines System dynamics Systems operation

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Effects of plasma current density profile on minor disruption in disruption simulations of J-TEXT 2

Effects of plasma current density profile on minor disruptio...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： Yuan, Jianjun Jiang, Zhonghe Li, Zhen Jiao, Zixiao Li, Keze Xiong, Jinyu Gu, Fan Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781665400640

Experimental and theoretical researches of disruption mitigation were conducted in J-TEXT to explore the mechanism of disruptions and the method of mitigation. Among this researches, minor/major disruption was studied by numerical simulations. For the sake of comprehending the effects of plasma current density profile on minor disruption profoundly, simulations of supersonic molecular beam injection(SMBI) of impurities(argon) into J-TEXT with different distributions of plasma current density profile are conducted by NIMROD, a 3D magnetohydrodynamic(MHD) code. In this paper, different distributions of current density profile are realized by changing the safety factor to change the current density gradients. The result indicates that the distribution of the current density profile can affect MHD behaviors, which have a significant impact on minor disruption. © 2021 IEEE.

关键词： Magnetohydrodynamics

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Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

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Plasma Science and technology 2021年第12期23卷 22-31页

作者： Xiaolong ZHANG Zhifeng CHENG Song ZHOU Yunfeng LIANG Wei YAN Nengchao WANG Xiaoyi ZHANG Zhonghe JIANG Zhoujun YANG Xin XU Da LI Qiong LI Xiaodong LIN Yonghua DING Zhongyong CHEN Zhipeng CHEN J-TEXT Team Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Forschungszentrum Jiilich GmbH Institut fur Energie und Klimaforschung-Plasmaphysik52425 JiilichGermany

The effect of externally applied resonant magnetic perturbation(RMP)on carbon impurity behavior is investigated in the J-TEXT *** is found that the m/n=3/1 islands have an impurity screening effect,which becomes obvious while the edge magnetic island is generated via RMP field *** impurity screening effect shows a dependence on the RMP phase with the field penetration,which is strongest if the O point of the magnetic island is near the low-field-side(LFS)limiter *** combining a methane injection experimental study and STRAHL impurity transport analysis,we found that the variation of the impurity transport dominates the impurity screening *** impurity diffusion at the inner plasma region(r/a<0.8)is enhanced with a significant increase in outward convection velocity at the edge region in the case of the magnetic island’s O point near the LFS limiter *** impurity transport coefficient varies by a much lower level for the case with the magnetic island’s X point near the LFS limiter *** interaction of the magnetic island and the LFS limiter plate is thought to contribute to the impurity transport variation with the dependence on the RMP phase.A possible reason is the interaction between the magnetic island and the LFS limiter.

关键词： magnetic island impurity transport resonant magnetic perturbation boundary plasma physics J-TEXT tokamak

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