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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Zeng, Kaiwen Wang, Haizhu Liu, Jianing Dong, Chao Lan, Xinbin Wang, Chenglong Le, Lingling Ai, Xiaomeng Guangdong Power Grid Power Dispatch Control Center Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728143033

The electrolytic aluminum accounts for about 7% of China's total electricity use and has great potential for demand-side response (DR) with smart grid technologies. This paper focuses on the optimal scheduling of the electrolytic aluminum with DR function. The bi-level optimization model is proposed to guide electrolytic aluminum load for providing DR. In the proposed optimization model, the upper-level problem is to minimize the system operational cost, while the lower-level problem is to maximize the profit of the aluminum plant. The Karush-Kuhn-Tucker optimality conditions for the lower-level problem is derived, and the bi-level problem is reformulated as the mix-integer quadratic programming problem. The simulation results demonstrate that the proposed bi-level programming can not only reduce the operational cost of the power system, but also increase the profit of the electrolytic aluminum plant when it provides DR services. © 2020 IEEE.

关键词： Aluminum plants

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An Intelligent Sensing Platform for Detecting and Identifying Biochemical Substances Based on Terahertz Spectra

SSRN

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SSRN 2024年

作者： Chen, Yusa Xiong, Shisong Wu, Meizhang Huang, Xiwen Sun, Hongshun Cao, Yunhao Li, Liye Ma, Lijun Wu, Wengang Zhao, Guozhong Meng, Tianhua National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China School of Integrated Circuits Peking University Beijing100871 China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology University Beijing100096 China Department of Physics Capital Normal University Beijing100048 China Institute of Solid State Physics Shanxi Provincial Key Laboratory of Microstructure Electromagnetic Functional Materials Shanxi Datong University Datong037009 China

This paper presents the development of an intelligent sensing platform dedicated to accurately identifying terahertz (THz) spectra obtained from various biochemical substances. The platform currently has two distinct identification modes, which focus on identifying five amino acids, namely phenylalanine, methionine, lysine, leucine, and threonine, and five carbohydrates, namely aspartame, fructose, glucose, lactose monohydrate, and sucrose based on their THz spectra. The first mode, called One-dimensional THz Spectrum Identification (OTSI), combines THz time-domain spectroscopy (THz-TDS) with the proposed mini convolutional neural network (MCNN) model. THz-TDS detects biochemical substances, while the MCNN model identifies the THz spectra. The MCNN model has a simple structure and only needs to deal with the THz absorption coefficients of biochemical substances, which are less computationally intensive and easily converged. The model can achieve 99.07% accuracy in identifying one-dimensional THz spectra of the ten biochemical substances. The second mode, THz Spectrum Image-based Identification (TSII), applies the YOLO-v5 target detection model to THz spectral image recognition. The YOLO-v5 model uses THz absorption peaks as identification features and can identify biochemical substances based on only one or several THz absorption peaks. The accuracy of the YOLO-v5 model in identifying THz absorption spectrum images of ten biochemical substances reaches more than 89%. This feature broadens the platform's utility in biomolecular analysis and paves the way for further research and development in detecting and analyzing diverse biological compounds. © 2024, The Authors. All rights reserved.

关键词： Neural network models

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Integrated Modeling and Analysis of PEMFC based on Model Parameters Identification

Integrated Modeling and Analysis of PEMFC based on Model Par...

引用

Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zigan Xu Qi Chen Wuhan National High Magnetic Field Center and the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665400657

Based on mechanism analysis of proton exchange membrane fuel cell (PEMFC), a semi mechanism and semi empirical steady-state simplified model is established by adopting reasonable and necessary assumptions, which helps the study of fuel cell polarization curves. Taking external conditions such as temperature, pressure and current density as variables, the model identifies fitting parameters by linear regression according to the experimental data, which proves its strong universality and generalization ability. In order to further study the output characteristics of PEMFC, a dynamic model is established in Matlab/Simulink to reflect the changes of output voltage and internal gas components. Considering different operating conditions and current requirements, the model is conductive to optimizing the structural design of the PEMFC, improving its operating performance and developing a real time control system.

关键词： Analytical models Temperature distribution Heuristic algorithms Fitting Linear regression Fuel cells Control systems

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Measuring Near-Field Radiative Heat Transfer in a Graphene-SiC Heterostructure

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Physical Review Applied 2023年第2期19卷 024019-024019页

作者： Naeem Iqbal Sen Zhang Shuai Wang Zezheng Fang Yaoyuan Hu Yongdi Dang Minjie Zhang Yi Jin Jianbin Xu Binfeng Ju Yungui Ma State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou China The State Key Lab of Fluid Power Transmission and Control School of Mechanical Engineering Zhejiang University Hangzhou China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou China Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Near-field radiative heat transfer between closely placed objects may exceed the far-field black-body radiation limit by orders of magnitude, especially between polaritonic materials. Great efforts have been made to experimentally measure this fundamental effect in various systems. In this work, we manage to experimentally characterize the near-field thermal emission between less explored plasmon-phonon hybrid material systems made of a graphene-SiC heterostructure. The experiment is carried out using a custom-designed all-optical measurement setup. A heat flux enhancement factor of 26 over the black-body radiation limit is obtained at a 150-nm vacuum gap. Three fundamental modes, i.e., surface plasmon and phonon polaritons with frustrated modes, are identified to contribute the near-field heat flux in this hybrid system. The measured results are well reproduced from the analytical calculations, indicating the robustness of the measurement. Deeper experimental explorations for near-field heat transfer between more complicated material systems could be encouraged in the future.

关键词： Energy harvesting devices Heat transfer Near-field optics Surface plasmon polariton Graphene Van der Waals systems Optical techniques

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EKF for three-vector model predictive current control of PMSM 1

EKF for three-vector model predictive current control of PMS...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Dai, Yongzihao Ye, Caiyong Zhao, Sifeng Yu, Dezuan Dian, Renjun Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Wuhan University of Science and Technology School of Information Science and Engineering Wuhan430081 China

ISBN: (纸本)9781728196596

Permanent magnet synchronous machines (PMSM) are widely used due to their small size and good running performance. However, PMSM have the disadvantages of multivariable and strong coupling, which make it difficult to design the regulator parameters. To solve this problem, this paper studies the use of three-vector model predictive current control (TV-MPCC) in PMSM. The traditional TV-MPCC uses speed sensors, which increases the cost and installation difficulty. The extended Kalman filter (EKF) algorithm which is applied for detecting rotor position and speed is proposed in this article. By comparing the traditional TV-MPCC algorithm with sensorless algorithm, the results indicate that there is no significant difference between sensorless algorithm and the traditional MPCC algorithm, sensorless algorithm has an analogous dynamic and steady-state performance. © 2020 IEEE.

关键词： Extended Kalman filters

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Upgrade of Vacuum Ultraviolet Spectroscopy System on J-TEXT tokamak

Upgrade of Vacuum Ultraviolet Spectroscopy System on J-TEXT ...

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第10届亚洲和澳大利亚真空与表面科学会议、中国真空学会2021学术年会、第十五届国际真空科学与工程应用学术会议

作者： X.Y.Zhang W.J.Qing X.L.Zhang S.D.Jiao Q.Li Y.H.Ding Z.F.Cheng J-TEXT team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and Technology Advanced Energy Research Center Shenzhen University

The vacuum ultraviolet (VUV) spectroscopy,as one of the most fundamental diagnostics on tokamaks,have long been used in the study of impurity *** is commonly used to monitor the impurity species and obtain impurity di... 详细信息

关键词： plasma impurity vacuum ultraviolet spectroscopy fast acquisition

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New method for fault line selection in distribution network based on active grounding of fault phase bus 16

New method for fault line selection in distribution network ...

引用

16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Liu, Xiangyu Yin, Xianggen Chen, Rui Xu, Quan Yuan, Zhiyong Yu, Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Distribution Technology Research Institute Electric Power Research Institute CSG Guangzhou China

ISBN: (纸本)9781839533914

The neutral point ungrounded system is widely used in China because of its power supply reliability. When an intermittent arc grounding fault occurs, active grounding the fault phase bus can extinguish the arc and suppress the overvoltage. Use of the bus active grounding device adds an extra grounding process with fault characteristics, which can provide data support for subsequent fault line selection. As far as the zero-mode network of the system is concerned, the magnitude and direction of the zero-mode current flowing on each line depends on the location of the fault and changes in the equivalent voltage source. Because of the input of the bus active grounding device, the fault originally located on the line is transferred into the bus, so the electrical characteristics of the two transient processes before and after can be comprehensively used. The zero-mode current of each line is extracted to calculate the line energy, and the energy difference between two transient processes is compared with the threshold value to realize fault line selection. This method uses the current signals of the respective feeders, and it does not require data comparison between feeders. The accuracy and robustness of the proposed method are verified by simulations. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Electric grounding

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Two-dimensional shaping of Solov'ev equilibrium with vacuum using external coils

arXiv

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arXiv 2022年

作者： Liu, Jiaxing Zhu, Ping Li, Haolong 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 Huazhong University of Science and Technology Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

In this work, we demonstrate a method for constructing the Solov'ev equilibrium with any given 2D shape surrounded by a vacuum region using external poloidal field coils. The computational domain consists of two parts: the plasma region, where the solution is the same as the Solov'ev solution, and the vacuum region, where the magnetic field generated by external coils as well as plasma current is determined using the Green function method through a matching condition near the separatrix. However, the method is not limited to the Solov'ev equilibrium in particular. The accuracy, efficiency, and robustness of such a scheme suggest that this method may be applied to the 2D shaping of tokamak plasma with vacuum region using external coils in general. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnetoplasma

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Mathematical Model of Year-Round Renewable Energy Time Series for Power System Planning Based on Multiple Seasonal-Trend Decomposition Using the LOESS and Ito Stochastic Process

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IET Renewable Power Generation 2025年第1期19卷

作者： Yijia Zhou Mingyu Yan Hongyi Peng State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China School of Electric and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Generating year-round renewable energy time series with hourly resolution is important for power system planning. This paper provides the characteristic analysis method and mathematical model of the year-round renewable energy time series. First, the multiple seasonal-trend decomposition using the LOESS (MSTL) method is adopted to decouple the historical renewable energy time series into trend, annual, seasonal, and residual components. The annual and seasonal components are repeating cycles, while the trend and residual components are time-dependent stochastic time series. To build the mathematical model for trend and residual components, the mixed Gaussian distribution model is applied to simulate the probabilistic distribution of trend and residual components. Based on these probabilistic distribution functions, the Ito stochastic process is applied to generate massive time series considering the stochastic and temporal dependent characteristics of the primal time series. A discretization formulation of the Ito stochastic process is provided so that the Ito stochastic process can be applied in renewable energy time series generation. The relationship between the drift and diffusion function used in the Ito stochastic process is depicted. Numerical results illustrate that the proposed method could effectively identify the characteristics of renewable energy time series and generate massive similar renewable energy time series for power system planning.

关键词： mixture Gaussian model ito stochastic process renewable energy sources time series

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Highly Stable and Encapsulation-Microstructural Cathode Enabled by Na-Halides for Superb All-Solid-State Na Batteries

SSRN

引用

SSRN 2023年

作者： Li, Lin Yao, Jingming Xu, Ruonan Yan, Xinlin Yu, Chuang Zhang, Long Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and Energy Fujian Normal University Fuzhou350117 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstr. 8-10 Vienna1040 Austria State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430000 China

The emerging halide solid electrolytes (SEs) possess superior (electro)chemical oxidation stabilities compared to sulfide SEs, but the understanding on their good compatibility toward oxide active materials needs to be further studied. Here, we develop a type of Zr-doped Na3YbCl6 chloride SEs. The optimized composition gains a high ionic conductivity and broad electrochemical oxidation window. The in situ EIS-DRT and ex situ XPS analyses verify that the chloride as ionic additives in the cathode is highly compatible with NaCrO2. Importantly, it is revealed that the volume change in the cathode can act a position effect on the microstructure evolution. It promotes to form a special core-shell-like structure with homogeneous chloride encapsulating NaCrO2 grains. Such a soft intimate contact promotes a uniform ion transport and mitigate electrochemo-mechanical stresses. The prerequisites generating this specific microstructure are proposed. The main capacity loss of the assembled ASSNBs only occurs at the initial 50 cycles, induced by the irreversible O3→O'3 phase transition in NaCrO2. The chloride additives with a soft feature and high oxidation-stability allow a high-quality interface in the oxide cathode and an excellent cycling stability of the ASSNBs. © 2023, The Authors. All rights reserved.

关键词： Solid electrolytes

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