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23rd International Symposium on High Voltage engineering (ISH 2023)

作者： Yucheng Wang Hua Li Ziqin Huang Fuchang Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan People's Republic of China

ISBN: (数字)9781839539923

High voltage capacitors are widely used in electrical power systems. For better capability in applications, capacitors are impregnated with insulating oil. Polypropylene in its natural state is inherently unstable and degrades when exposed to oxygen. To avoid oxidation that occurs in the process of film forming, antioxidants are developed and used. In this paper, the polypropylene casts added respectively with antioxidant 1010, 3114, 330 and BHT were long-term impregnated in benzyl toluene oil. Secondly, the frequency domain dielectric spectroscopy method was used to study the dielectric properties of the oil. In addition, the effect of antioxidants on the polarization relaxation process of insulating oil was analyzed. The results indicate that antioxidants and small molecular polypropylene in the amorphous region of the film migrate to the oil during long-term impregnation, resulting in increases in relative dielectric constant ɛ r , dielectric loss tan δ and dc conductivity σ dc , and affect the polarization relaxation process. Among these antioxidants, antioxidant 1010 has the greatest impact on insulating oil, while antioxidant 330 has the least impact.

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Characteristics Evaluation of SiC MOSFET in DC Circuit Breaker

Characteristics Evaluation of SiC MOSFET in DC Circuit Break...

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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

作者： Zhongqi Guo Lin Liang Xiangyu Wan Zhengheng Qing Ziyang Zhang Xiaoxue Yan State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Ministry of Education of China Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

In order to evaluate the characteristics of SiC MOSFET under the mission profile of DC Circuit Breaker (DCCB), a complete DCCB test platform considering the RCD transfer loop and the MOV absorption loop is set up. Based on this platform, single and repetitive short-circuit interrupting experiments are carried out. Through these tests, the characteristics evaluation of 1200V/66A SiC MOSFET under DCCB is tested and analyzed. The aging test results are given. DCCB has its unique mission profile (interruption of large short-circuit current, fast current transfer, etc.), and the characteristics evaluation of SiC MOSFET in DCCB is necessary. For the single tests, the maximum interrupted current is 2.02 times the rated current. For the repetitive tests, the number of interruptions exceeds 2000 times and the interruption boundary is 2004 times under 1.85 times rated current. The failure causes of the devices in two cases are drain thermal failure and gate-source short circuit respectively. After 2000 experiments, the interruption time of DCCB increased significantly, and the $I_{\text{dss}}, V_{\text{gs}(\text{th})}$ , and $R_{\text{ds}(\text{on})}$ of the device increased by about 53.36%, 4.29%, and 16.94% respectively.

关键词： Heating systems MOSFET Silicon carbide Absorption Circuit breakers Short-circuit currents Logic gates Aging MOSFET circuits Fault currents

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Gelation mechanisms of gel polymer electrolytes for zinc-based batteries

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Chinese Chemical Letters 2024年第5期35卷 97-116页

作者： Mengjun Sun Zhi Wang Jvhui Jiang Xiaobing Wang Chuang Yu Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control Ministry of EducationHenan Key Laboratory for Environmental Pollution ControlSchool of EnvironmentHenan Normal UniversityXinxiang 453007China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Zinc-based batteries(ZBs)have been deemed as a potential substitute for lithium-ion batteries due to its unique advantages of abundant resources,low cost and acceptable energy *** great progress in designing electrode materials has been made,the development of high-performance ZBs still remain challenges,such as the dendrite growth of zinc anode,hydrogen evolution reaction,limited electrochemical stability window,water evaporation and liquid *** polymer electrolytes(GPEs),including hydrous GPEs with low content of active water and anhydrous GPEs without the presence of water,are proposed to avoid these ***,employing GPEs is conductive to fabricate flexible devices owing to the good mechanical *** date,most of researches focus on discovering new GPEs and exploring its application on flexible or wearable *** reviews also have outlined the polymer matrixes and advances of GPEs in various battery *** this,herein,we seek to summarize the gelation mechanisms of GPEs,involving physical gel of polymer,chemical crosslinking of polymer and chemical polymerization of ***,the preparation methods are also *** addition,not only the features and central conundrum of GPEs are analyzed but also the corresponding strategies are discussed,contributing to design GPEs with ideal properties for high-performance ZBs.

关键词： Gelation mechanisms Gel polymer electrolytes Zinc-based batteries Gelation methods

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New Sliding Mode Control Algorithm of Magnetic Bearing Based on state Feedback Decoupling

New Sliding Mode Control Algorithm of Magnetic Bearing Based...

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

作者： Haoqi Liu Caiyong Ye Tianyu Wang Yunfeng Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China National Center for Quality Inspection and Test of Motors Anhui China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

A new sliding mode control method based on state feedback decoupling is introduced, which solves the problem of poor decoupling control effect of traditional control strategy on active magnetic bearing (AMB). In this paper, magnetic bearing system is divided into four independent subsystems by using the principle of linear state feedback. Secondly, considering the shortcomings of the traditional controller, a nonlinear nonsingular terminal sliding mode controller with terminal sliding mode is proposed. Aiming at the chattering problem in sliding mode control, an easy-to-implement sigmoid function is designed to replace the traditional discontinuous switching function. Finally, by building a simulation model and conducting simulation experiments, it is proved that the control strategy combining the above two methods can improve the control accuracy, response speed and robustness of the magnetic bearing control system.

关键词： Vibrations state feedback PI control Simulation Switches Robustness Feedback linearization PD control Sliding mode control Magnetic levitation

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Numerical simulation of disruption mitigation by applying non-resonant magnetic perturbation and massive gas injection on J-TEXT 3

Numerical simulation of disruption mitigation by applying no...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Li, Zhen Jiang, Zhonghe Gu, Fan Jiao, Zixiao Yuan, Jianjun Li, Keze Xiong, Jinyu School of Electrical and Electronic Engineering 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 Wuhan430074 China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering China

ISBN: (纸本)9781665477321

A lot of experimental and theoretical researches have been carrying out to examine the disruption mechanism and the methods to mitigate disruption, including massive gas injection (MGI) and shattered pellet injection (SPI). Based on NIMROD (non-Ideal Magnetohydrodynamics with Rotation, Open Discussion), numerical simulations of the synergistic effect between non-resonant magnetic perturbations and massive gas injection on disruption mitigation is carrying out in J-TEXT. In this paper, we investigate thermal quench, current quench time and the growth of n=1-3 component MHD instabilities responsed to different amplitudes of non-RMPs. The results indicates that non-RMPs can prolong thermal quench and current quench durations and create stronger perturbations during disruption, leading to a high loss of runaway electrons seeds and reducing the hazard of disruption. © 2022 IEEE.

关键词： Numerical models

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An Enhanced Control Strategy for Standalone Brushless Doubly Fed Induction Generator Under Unbalanced Load Using Reactive Power Loop 1

An Enhanced Control Strategy for Standalone Brushless Doubly...

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1st IEEE IAS Global Conference on Emerging Technologies, GlobConET 2022

作者： Elbabo Mohammed, Omer Mohammed Liu, Yi Xu, Wei Islam, Md. Rabiul University of Sinnar Faculty of Engineering Department of Electrical Engineering Sinnar Sudan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China University of Wollongong School of Electrical Computer and Telecommunications Engineering Wollongong Australia

ISBN: (数字)9781665443579

ISBN: (纸本)9781665443579

Without brushes and slip rings, the brushless double-fed induction generator (BDFIG) can operate more stably and reliably, so it is prospective to be one of important machines for standalone systems in the next few years. The stability of amplitude of voltage and frequency of power winding (PW) is major aim of control in off-grid system. Also, the standalone system is oversensitive to abnormal running situations, especially with unbalanced conditions. The unbalanced loads would lead to harmful phenomena, such as the unbalanced impact of current and voltage of PW. To handle this issue, the reactive power loop is presented to minimize voltage unbalance of PW through creating control winding (CW) compensation voltage via converter of machine side (MSC). The simulation is executed to test the performance of presented method. © 2022 IEEE.

关键词： Reactive power

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A Variable Parameter Series Compensation Method Featuring Fast Dynamic Response for Dual Active Bridge Converter in Battery Charging/Discharging Applications

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IEEE Transactions on Power Electronics 2025年

作者： Wang, Feng Wang, Xuehua Yuan, Jialing Ruan, Xinbo Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Nanjing University of Aeronautics and Astronautics Center for More-Electric-Aircraft Power Systems College of Automation Engineering Nanjing210016 China

The extended-phase-shift (EPS) modulated dual-active-bridge (DAB) converter has become prevalent in battery charging/discharging systems, where low overshoot and short settling time are critically required. However, wide variations in battery voltage and current and abrupt operating mode transitions tend to challenge the dynamic performance of the converter. In this paper, a small-signal model is developed, the potential challenge due to the wide-range variations or abrupt mode transitions is evaluated, and a variable parameter series compensation (VPSC) method is proposed. The proposed method can adjust its parameters in real time according to the variations in battery voltage and current, making the dynamics of the EPS-DAB converter immune to the variations. For practical implementation, a polynomial-fit approximation is conducted to minimize the computational complexity. An execution-optimized flowchart is also provided. Experimental results on a 45-kW prototype demonstrate the effectiveness of the VPSC method. Even under the worst case when the battery voltage is 107 V and the battery current steps from 100 A to -100 A, no overshoot arises and the settling time is less than 6 ms. © 1986-2012 IEEE.

关键词： Polynomial approximation

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Analysis and Enhancement of Synchronization Stability in Grid-forming PV Systems Using Torque Component Quantification

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IEEE Transactions on Energy Conversion 2025年

作者： Chen, Qiong Tang, Yajie Gong, Diyang Lin, Lei Zeng, Qianqian Shi, Xiaojie State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China Electric Power Research Institute State Grid Zhejiang Electric Power Co. Ltd. Hangzhou310022 China

With the rapid deployment of distributed PVs, the stability issues become a serious concern for power systems. As a solution, the grid-forming control (GFM) featuring active regulation of voltage and frequency emerges. Among various GFM schemes, the DC-link voltage synchronous control has attracted tremendous attention as it can stabilize the DC-link voltage of PV systems and utilize the stored energy of their DC-link capacitors to mimic the inertia support. However, a PV system using the DC-link voltage synchronous control (PV-DVSC) can cause low-frequency oscillations (LFOs) under certain operating conditions. To mitigate such risks, this paper investigates the mechanism of LFO and associated suppression method, utilizing the torque component quantification. Firstly, a torque analysis model of the PV-DVSC is established to elucidate the contribution of different control loops on LFO from a torque vector perspective. Additionally, the impacts of key parameters on LFO are quantitatively assessed via the damping and synchronizing torques. Leveraging these torques, a torque-oriented phase compensator (TOPC) is designed, targeting a positive torque to effectively suppress the unstable LFO even under extreme conditions such as desynchronization. Finally, the validity of above analysis and proposed TOPC strategy are verified through simulation control-hardware-in-The-loop test results. © 2025 IEEE.

关键词： Electric power system control

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Process and challenges of stainless steel based bipolar plates for proton exchange membrane fuel cells

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1099-1119页

作者： Gaoyang Liu Faguo Hou Shanlong Peng Xindong Wang Baizeng Fang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Chemical and Biological Engineering University of British Columbia2360 East MallVancouverBC V6T 1Z3Canada

Proton exchange membrane fuel cell(PEMFC)powered automobiles have been recognized to be the ultimate solution to replace traditional fuel automobiles because of their advantages of PEMFCs such as no pollution,low temperature start-up,high energy density,and low *** one of the core components,the bipolar plates(BPs)play an important role in the PEMFC *** graphite BPs and composite BPs have been criticized for their shortcomings such as low strength,high brittleness,and high processing *** contrast,stainless steel BPs(SSBPs)have recently attracted much attention of domestic and foreign researchers because of their excellent comprehensive performance,low cost,and diverse options for automobile ***,the SSBPs are prone to corrosion and passivation in the PEMFC working environment,which lead to reduced output power or premature *** review is aimed to summarize the corrosion and passivation mechanisms,characterizations and evaluation,and the surface modification technologies in the current SSBPs *** non-coating and coating technical routes of SSBPs are demonstrated,such as substrate component regulation,thermal nitriding,electroplating,ion plating,chemical vapor deposition,and physical vapor deposition,*** coating materials for SSBPs are metal coatings,metal nitride coatings,conductive polymer coatings,and polymer/carbon coatings,*** the surface modification technologies can solve the corrosion resistance problem of stainless steel without affecting the contact resistance,however still facing restraints such as long-time stability,feasibility of low-cost,and mass production *** paper is believed to enrich the knowledge of high-performance and long-life BPs applied for PEMFC automobiles.

关键词： automobile application proton exchange membrane fuel cell stainless steel bipolar plates corrosion resistance contact resistance

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Hybrid AC/DC Collection and HVDC Transmission Topology for Large-scale Offshore Wind Farms

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CSEE Journal of Power and Energy Systems 2025年第3期11卷 949-959页

作者： Wang Xiang Rui Tu Mingyu Han Jinyu Wen School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Changzhou Power Supply Company of State Grid Jiangsu Electric Power Co. Ltd. Changzhou China

Conventional offshore wind integration systems use 33kV or 66kV AC cables to collect wind energy and employ high voltage direct current (HVDC) transmission technology to deliver wind power to onshore grids. This scheme suffers from high costs for collection systems and offshore platforms when the capacity of offshore wind farms increases. This paper proposes a hybrid AC/DC collection and HVDC transmission concept for the large-scale offshore wind integration system. Wind farms near the offshore converter platform are integrated using AC collection cables, while the remaining wind farms are integrated using DC collection cables. The AC and DC collection cables infeed to the offshore converter platform, which features a three-terminal hybrid AC/DC/DC hub. The system layout and operating principle of the hybrid AC/DC collection and HVDC transmission system are introduced in detail. The control strategy and parameter design of the hybrid AC/DC/DC hub are presented. An economic evaluation comparing conventional AC collection and HVDC transmission schemes is conducted. It is indicated that the proposed integration concept can reduce the operating power capacity and power loss of the offshore converter, enhancing the economic efficiency of the overall integration system. Finally, the effectiveness of the proposed integration technology is validated in a 2000MW offshore wind power integration system by PSCAD/EMTDC simulation analysis.

关键词： Wind farms HVDC transmission Voltage Topology Costs Wind power generation Propagation losses Wind energy integration Underwater cables Seaports

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