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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620791

The electrical contact between the armature and rail is acknowledged as imperfect electrical contact (ImPEC), exhibiting characteristics distinct from bulk behavior. It is important to understand the current distribution of the ImPEC for future design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. Variations in the contact pressure and current density with time are analyzed. The results show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current path changes with the contact area, and the current shifts from the trailing edge to the leading edge over time. Additionally, comparative calculations are performed to analyze current variations under dynamic contact. Results suggest that the current distribution is influenced by magnetic diffusion and forced shifts of current caused by dynamic contact. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Threshold current density

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On the Limit Cycle Caused by Controller Saturation in Synchronous Buck Converter 11

On the Limit Cycle Caused by Controller Saturation in Synchr...

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Xu, A. Ying Xuehua Wang, B. He, C. Yuying Hao Zhang, D. Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Hohai University College of Energy and Electrical Engineering Nanjing China

ISBN: (纸本)9788957083505

In the reported instability incidents of power converter-based systems, a constant-amplitude oscillation instead of divergence was often observed, which is the so-called limit cycle phenomenon. This does not agree with theoretical analysis based on classical linear control theory. Taking a synchronous buck converter as an example, this paper aims to investigate the underlying mechanism of the limit cycle phenomenon. It finds that this phenomenon results from the nonlinear controller saturation. To clarify the underlying mechanism, the controller saturation is linearized through the describing function method, then the generalized Nyquist stability criterion is applied. It reveals that the system operation point dynamically drifts and ultimately stays at the critically stable point, featuring the constant-amplitude oscillation. Moreover, the occurrence condition and the calculation of the oscillating amplitude and frequency are also explored. Simulations and experiments verify the correctness of the analysis. © 2023 The Korean Institute of Power Electronics.

关键词： Controllers

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A Model Predictive Control Method for Hybrid Energy Storage Systems

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CSEE Journal of Power and Energy Systems 2021年第2期7卷 329-338页

作者： Siyuan Chen Qiufan Yang Jianyu Zhou Xia Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The traditional PI controller for a hybrid energy storage system(HESS)has certain drawbacks,such as difficult tuning of the controller parameters and the additional filters to allocate high-and low-frequency power *** paper proposes a model predictive control(MPC)method to control three-level bidirectional DC/DC converters for grid-connections to a HESS in a DC ***,the mathematical model of a HESS consisting of a battery and ultra capacitor(UC)is established and the neutral point voltage imbalance of a three-level converter is solved by analyzing the operating modes of the ***,for the control of the grid-connected converters,an MPC method is proposed for calculating steady-state reference values in the outer layer and the dynamic rolling optimization in the inner *** outer layer ensures the voltage regulation and establishes the current predictive model,while the inner layer,using the model predictive current control,makes the current follow the predictive value,thus reducing the system current *** cascaded topology has two independent controllers and is free of filters to realize the high-and low-frequency power allocation for a ***,it allows two types of energy storage devices to independently regulate the voltage and realizes the power allocation of the battery and ***,simulation studies are conducted in PSCAD/EMTDC,and the effectiveness of the proposed HESS control strategy is verified in a case,such as a controller comparison and fault scenario.

关键词： Double layer control method hybrid energy storage system(HESS) model predictive control(MPC) three-level DC/DC converter

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Prediction of Contact Terminal Temperature of Vacuum Circuit Breaker under Complex and Unknown Boundary Conditions 7

Prediction of Contact Terminal Temperature of Vacuum Circuit...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Li, Yingzhuo Chen, Lixue Yuan, Zhao Xu, Shengqin Sun, Likang Zou, Xinyang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education Wuhan China

ISBN: (纸本)9798350345094

The monitoring of contact terminal temperature of vacuum circuit breakers is of great significance for fault prediction, life assessment, and structural improvement of circuit breakers. This article proposes a prediction method for steady-state temperature of vacuum circuit breaker's contact based on RBF neural network. Firstly, a finite element simulation model based on the actual characteristics of ZKTD 2S00/36-31.5kV vacuum circuit breakers is built, according to which, 793 electromagnetic and thermal model samples of circuit breakers with different boundary conditions are generated. Then, Random Forest regression, LASSO regression and ReliefF regression are used to rank the importance of temperature measurement points at different locations, based on the ranking results from 3 regression models, 4 optimal temperature measuring points are obtained. While the actual boundary conditions of the vacuum circuit breaker are unknown, the contact terminal temperature is accurately predicted by only using the temperatures of four temperature measuring points and the contact resistance values. Finally, a control experiment was set up to further verify the predictive ability of multiple temperature measuring points for contact terminal temperature under complex and unknown boundary conditions. © 2023 IEEE.

关键词： Boundary conditions

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In-situ polymerized carbonate induced by Li-Ga alloy as novel artificial interphase on Li metal anode

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Chinese Chemical Letters 2023年第9期34卷 294-299页

作者： Ziping Wang Shuyuan Xie Xuejie Gao Xinyang Chen Lina Cong Jun Liu Haiming Xie Chuang Yu Yulong Liu School of Chemistry Northeast Normal UniversityChangchun 130024China Center for Lignocellulosic Chemistry and Biomaterials College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode ***,the practical usage of Li metal as an anode is severely limited because of inevitable parasitic side reactions with electrolyte and dendrites *** present,single-component artificial solid electrolyte interphase cannot simultaneously meet the multiple functions of promoting ion conduction,guiding lithium ion deposition,inhibiting dendrite growth,and reducing interface side ***,multi-component design on Li metal surface is widely investigated to achieve long-term ***,we report a Li_(2)Ga-carbonate polymer interphase layer to solve volume changes,Li dendrites formation and *** a result,the Li symmetric cell can be stabilized at 3.0 m A/cm^(2)in carbonate electrolyte with limited volume of 20μ*** with 13.6 mg/cm^(2)(loading of 2 mAh/cm^(2))LiFePO_(4)cathode,discharge capacity retains at 90%for over 150 cycles under limited electrolyte *** such an alloy-polymer interphase layer,higher energy density Li metal batteries become prominent in the near future.

关键词： Lithium metal Alloy Polymer film High energy density Self-healing

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Optimization Method for Minimum Mass of Permanent Magnet Excited HIA with Air-Gap Winding

Optimization Method for Minimum Mass of Permanent Magnet Exc...

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2023 IEEE International Conference on Power Science and technology, ICPST 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Kunming University of Science and Technology Faculty of Electric Power Engineering Kunming China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350311358

This paper proposes the optimization method for the minimum mass of permanent magnet (PM) excited homopolar inductor alternator (HIA) with air-gap winding used for high-speed driving system. The calculation results show that there is an optimal value for shell diameter to make the mass to be smallest. A 1 MW at 22000 rpm PM excited HIA is designed. The analytical results are verified by the FEM simulations. The losses, temperature rise, rotor stress and modal of the PM excited HIA are also analyzed. The calculation results show that the solid rotor eddy-current losses and the temperature rise of PM excited HIA are acceptable. Also the rotor strength is adequate, and the rotor system is a stiffness rotor, and it can safely operate. © 2023 IEEE.

关键词： Permanent magnets

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Surrogate-Assisted Multiobjective Gene Selection for Cell Classification from Large-Scale Single-Cell RNA Sequencing Data

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IEEE Transactions on Evolutionary Computation 2025年第3期29卷 601-615页

作者： Lin, Jianqing He, Cheng Jiang, Hanjing Huang, Yabing Jin, Yaochu Huazhong University of Science and Technology Key Laboratory of Image Information Processing and Intelligent Control of Education Ministry of China School of Artificial Intelligence and Automation Wuhan430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China Renmin Hospital Department of Pathology Wuhan University Wuhan430060 China Westlake University Trustworth and General Artificial Intelligence Laboratory School of Engineering Hangzhou310030 China

Accurate cell classification is crucial but expensive for large-scale single-cell RNA sequencing (scRNA-seq) analysis. Gene selection (GS) emerges as a pivotal technique in identifying gene subsets of scRNA-seq for classification accuracy improvement and gene scale reduction. Nevertheless, the rising scale of scRNA-seq data presents challenges to existing GS methods regarding performance and computational time. Thus, we propose a surrogate-assisted evolutionary algorithm for multiobjective GS to address these deficiencies. An innovative two-phase initialization method is proposed to select sparse solutions to provide preliminary insights into gene contributions. Then, a binary competitive swarm optimizer is proposed for effective global search, where a local search method is embedded to eliminate irrelevant genes for efficiency consideration. Additionally, a surrogate model is adopted to forecast classification accuracy efficiently and substitutes part of the computationally expensive classification process. Experiments are conducted on eight large-scale scRNA-seq datasets with more than 20,000 genes. The effectiveness of the proposed GS method for scRNA-seq cell classification compared with eight state-of-the-art methods is validated. Gene expression analysis results of selected genes further validated the significance of the genes selected by the proposed method in the classification of scRNA-seq data. © 1997-2012 IEEE.

关键词： Gene expression

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An Improved Calculation Method for AC Losses of 30 MJ/5 MW SMES

An Improved Calculation Method for AC Losses of 30 MJ/5 MW S...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Qiu, Yifeng Ren, Li Xu, Ying Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

The toroidal D-shaped high-temperature super-conducting (HTS) magnet structure offers several advantages, such as low leakage magnetic field and vertical magnetic field on the tapes, and excellent mechanical properties characterized by pure tensile electromagnetic stress. As a result, it finds wide application in large-scale magnetic, including superconducting magnetic energy storage (SMES) and magnetic confinement fusion (MCF) devices. However, the highly asymmetric three-dimensional structure impose challenges in numerical modeling and electromagnetic computations, leading to difficulties in modeling, low computational efficiency, and even computational infeasibility. The "dimension reduction inversion"method is an innovative approach for electromagnetic calculations in toroidal magnets. this paper improved upon this method and applied it to the toroidal D-shaped structure, specifically calculating the electromagnetic field and AC loss of 30MJ/5MW liquid hydrogen superconducting composite energy storage (LIQHYSMES) magnet. This research provides a feasible approach for electromagnetic computations in large-scale toroidal D-shaped HTS magnets. © 2023 IEEE.

关键词： AC loss electromagnetic calculation HTS magnets toroidal D-shaped magnets

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A Control Strategy without Position Sensor in PMSM Electric Vehicle Drive

A Control Strategy without Position Sensor in PMSM Electric ...

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2023 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics, PRECEDE 2023

作者： Long, Zeyang Li, Zixin Wang, Shuanghong Huazhong University of Science and Technology School of Electric and Electronic Engineering Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350396867

Permanent-Magnet Synchronous Motor (PMSM) is widely used in the electric vehicle (EV) industry. Due to the instability and the cost of the position sensor, massive studies have been done to achieve the control without position sensor on PMSM. This paper analyzes the switching process from I/F strategy to Sliding Mode Observer (SMO) strategy in details, and also introduces the framework of I/F strategy with model predictive controller (MPC) as well as SMO used in the model. Furthermore, a new optimization algorithm called Angle Weighting Switching Strategy (AWSS) is proposed to smooth the transition process so as to mitigate the current-jitter and reduce speed fluctuation. Moreover, simulation between conventional switching method and the proposed method has been done to validate the effectiveness and robustness of the proposed control algorithm. © 2023 IEEE.

关键词： Permanent magnets

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State-of-art of in situ observations of inclusion agglomeration at steel/Ar and steel/slag interfaces:a review of recent development on experimental and theoretical studies

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Journal of Iron and Steel Research International 2025年第2期32卷 315-333页

作者： Yi Wang Jian-xun Fu Deepoo Kumar Qiang Wang Hong-liang Yang Wang-zhong Mu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden Engineering Materials Division of Materials ScienceDepartment of Engineering Science and MathematicsLuleåUniversity of TechnologyLuleå 97187Sweden Department of Metallurgical Engineering and Materials Science IIT BombayPowaiMumbaiIndia Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina ABB Metallurgy Västerås 72136Sweden

Cleanliness control of advanced steels is of vital importance for quality control of the *** order to understand and control the inclusion removal during refining process in molten steel,its motion behaviors at the multiple steel/gas/slag interfaces have attracted the attention much of metallurgical *** recent development of the agglomeration of non-metallic inclusions at the steel/Ar and steel/slag interfaces has been summarized,and both the experimental as well as theoretical works have been *** terms of in situ observation of high-temperature interfacial phenomena in the molten steel,researchers utilized high-temperature confocal laser scanning microscopy to observe the movement of more types of inclusions at the interface,i.e.,the investigated inclusion is no longer limited to Al_(2)O_(3)-based inclusions but moves forward to rare earth oxides,MgO-based oxides,*** terms of theoretical models,especially the model of inclusions at the steel/slag interface,the recent development has overcome the limitations of the assumptions of Kralchevsky-Paunov model and verified the possible errors caused by the model assumptions by combining the water model and the physical *** but not least,the future work in this topic has been suggested,which could be in combination of thermal physical properties of steels and slag,as well as utilize the artificial intelligence-based methodology to implement a comprehensive inclusion motion behaviors during a comprehensive metallurgical process.

关键词： Inclusion movement Steel/Ar interface Steel/slag interface In situ observation

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