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Revealing milling durations and sintering temperatures on conductivity and battery performances of Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte

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Chinese Chemical Letters 2023年第5期34卷 525-529页

作者： Shuai Chen Chuang Yu Chaochao Wei Linfeng Peng Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials Huazhong University of Science and TechnologyWuhan 430074China

Halide electrolytes in solid-state batteries with excellent oxidative stability and high ionic conductivity have been well reported ***,the high-cost rare-earth elements and long duration of highrotation milling procure are the major ***,we have successfully synthesized the low cost Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte consisting of abundant elements with comparable Li-ion conductivity in a short milling duration of 4 *** transition of the annealed sample was also carefully *** Ni_(0.6)Co_(0.2)Mn_(0.2)O_(2)/Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)/Li_(5.5)PS_(4.5)Cl_(1.5)/In-Li batteries using different halide electrolytes were constructed and cycled at different voltage ***-state battery using Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte obtained from long milling duration delivers higher discharge capacities and superior capacity retention than shorter milling time between 3.0 and 4.3 *** delivers much higher discharge capacity when cycled at elevated temperature(60℃)and suffers fast capacity degradation when the upper cut-off voltage increases to 4.5 V at the same current *** work provides an efficiency synthesis strategy for halide solid electrolyte and studies its applications in all-solid-state batteries in a wide temperature range.

关键词： Solid inorganic electrolyte Solid state battery Halide electrolyte High temperature Synthesis process

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Numerical study of current density on armature and rail interface with dynamic contact 10

Numerical study of current density on armature and rail inte...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure 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. The contact pressure and area vary with the input current, sharing similar trends, which 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 is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact. © 2024 Eindhoven University of technology.

关键词： Digital elevation model

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Transient Synchronous Stability Analysis and Assessment of PLL-Based VSC Systems by Bifurcation Theory

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IEEE Transactions on Energy Conversion 2024年第2期40卷 1312-1324页

作者： Han, Miao Ma, Rui Zhan, Meng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Jinan250061 China

For the transient synchronous stability of phase-locked loop based voltage source converter grid-tied systems, the generalized swing equation (GSE) is believed as very important. In this paper, the GSE is studied deeply by bifurcation theory. For instance, the co-dimension-2 Bogdanov-Takens (BT) bifurcation is rigorously analyzed, and the formulations for three co-dimension-1 bifurcations near the BT bifurcation point including the generalized saddle-node, Hopf, and homoclinic bifurcations are explicitly obtained. Moreover, all Hopf bifurcations in the GSE have been theoretically proven to be subcritical by the normal form method. Therefore, after the Hopf and homoclinic bifurcations, two different types of basin of attraction occur widely including a closed loop surrounded by an unstable limit cycle and a fish- like pattern surrounded by the stable manifold of unstable equilibrium point (UEP), respectively. In addition, for the transient synchronous stability assessment after the homoclinic bifurcation, based on the linear approximation of the stable manifold of the UEP, an index for the distance between the stable equilibrium point and the approximated stability boundary is formulated. All these theoretical results are well verified and supported by numerical calculations and real-time simulations, making all previous phenomenal observations of the GSE stand on the solid foundation of rigorous mathematics. © 1986-2012 IEEE.

关键词： Phase locked loops

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Online Multiparameter Estimation with Position Error Correction for Unified Synchronous Machine Sensorless Drives

Online Multiparameter Estimation with Position Error Correct...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Liu, Zirui Kong, Wubin Fan, Xinggang Wang, Fei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350316445

Parameters' accuracies are essential for model-based sensorless control in synchronous machine drives. In this paper, a multiparameter adaptive observer and a position error optimizer are presented to obtain real-time parameter information in the absence of rotor position data for unified synchronous machine (SM). The adaptive observer is based on the misaligned dq-axes' small-signal impedance model where dq-axes EMF coupling terms are well considered. All parameters can achieve high accuracy under entire operation region. In the case of isotropic SMs, the estimated parameters can be directly utilized in the model-based observer to acquire high precision position observation. And, for anisotropic SMs, an optimizer is introduced to correct parameter inaccuracies caused by position error. The effectiveness of the proposed adaptive observer and optimizer is evaluated through a combination of experiments and simulations, providing comprehensive validation of their performance. © 2023 IEEE.

关键词： Multiparameter Estimation Sensorless Control Unified Synchronous Machine (SM)

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Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rectifier Based on Phase and Transient Model

Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rect...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Lin, Zhongdong Peng, Li Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Numerous studies have shown that the power switch devices have high fault rate in converters. Aiming at above problem, this paper proposes a switch open-circuit faults (SOCF) diagnosis method in three-phase pulse-width modulation (PWM) voltage source rectifier (VSR). The diagnosis algorithm is based on phase information from the phase-locked loop (PLL) and line voltage deviations calculated by the transient model. The proposed method can accurately and rapidly diagnose all kinds of single and double SOCF, without extra hardware. Finally, simulations in MATlab/Simulink verify the robustness and effectiveness of the proposed method. © 2023 IEEE.

关键词： Pulse width modulation

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Characteristics Analysis of Three-Phase Symmetrical Phase-Locked Loop under Non-Ideal Grid Conditions

Characteristics Analysis of Three-Phase Symmetrical Phase-Lo...

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

作者： Su, Tianyi Lin, Hua Li, Shaojie Wang, Xingwei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350311358

Under weak grids, the output impedance of grid-connected inverter is coupled with the grid impedance, leading to poor quality of the grid current. To address this issue, the symmetrical phase-locked loop (PLL) has been proposed which can eliminate the frequency coupling and attribute the system model to be symmetrical. Although the system performances well under steady state, the characteristics of the inverter is unclear under non-ideal conditions at present. In this article, by investigating the inverter performance with the symmetrical PLL under different grid conditions, it is founded that both the dynamic and steady-state characteristics become worse compared to that with synchronous reference frame (SRF) PLL. The experiments validate the correctness of the theoretical analysis. © 2023 IEEE.

关键词： Phase locked loops

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Size Design of the Storage Tank in Liquid Hydrogen Superconducting Magnetic Energy Storage Considering the Coupling of Energy and Matter

Size Design of the Storage Tank in Liquid Hydrogen Supercond...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Wang, Chuang Li, Li Song, Meng Xu, Ying Hu, Kewei Zhong, Zhiyao Yang, Zhixing Fang, Jiakun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

The liquid hydrogen superconducting magnetic energy storage (LIQHYSMES) is an emerging hybrid energy storage device for improving the power quality in the new-type power system with a high proportion of renewable energy. It combines the superconducting magnetic energy storage (SMES) for the short-term buffering and the use of liquid hydrogen as both the bulk energy carrier and coolant. The storage tank is the core component of LIQHYSMES where the energy and matter are coupled. Therefore, this paper proposes the size design model for the storage tank in order to minimize the whole costs of LIQHYSMES. The thermal interactions between the SMES and hydrogen of both charging and discharging states are explicitly analyzed through the proposed model. Particularly, the phase transition of hydrogen in the storage tank, the charging state and thermal effect of SMES and the control strategy of electricity-hydrogen devices are modelled. Finally, case studies verified the effectiveness of the proposed model and the parameters of the storage tank are given. © 2023 IEEE.

关键词： coupling of energy and matter liquid hydrogen liquid hydrogen superconducting magnetic energy storage

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Static Hysteresis Process Modeling Based on Modified Tellinen Hysteresis Model 6

Static Hysteresis Process Modeling Based on Modified Telline...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Zhang, Yubo Chen, Dezhi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350346671

Modeling the process of the static magnetic hysteresis accurately is essential to compute the magnetic fields of electrical devices and components, and a modified static hysteresis model based on Tellinen hysteresis model is presented and verified in this paper. Only two measured ascending curves are needed to solve this static model, rather than the limiting loop, which is friendly to measuring device. By comparing the measured static hysteresis curves with the calculated static hysteresis curves, it is found that the static model shows good efficiency and accuracy, and the error caused by Tellinen hysteresis model itself could be negligible when the two measured curves the model demands are close to the curve to be computed. © 2023 IEEE.

关键词： Magnetic materials

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Research on A Controllable Reactor Realized by Multi-Winding Transformer 3

Research on A Controllable Reactor Realized by Multi-Winding...

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3rd Power System and Green Energy Conference, PSGEC 2023

作者： Wang, Weiyu Xie, Xiong Yin, Hao Li, Dayi Li, Jing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350340099

Controllable reactors (CR) are general FACTS (Flexible AC Transmission System) apparatuses, which have played a crucial role in improving the power flow distribution of the system, adjusting the reactive power balance of the power grid, stabilizing the voltage, and improving the stability of the system. This paper summarizes the characteristics of various types of controllable reactors, classifies reactors with different structures, and compares different controllable reactors from the perspectives of reactance change, response speed, harmonic problem, and control accuracy. A transformer-type controllable reactor based on flux compensation is proposed, the design scheme of secondary side multi-winding is adopted to realize the large-capacity reactor, the unity of single control winding and multi-control winding in the application is expanded, and the general principle of controllable reactor is obtained through the control of the 'linear two-port network' port, and the design principle of such reactor is summarized. © 2023 IEEE.

关键词： Flexible AC transmission systems

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Study on the Influence of Control Grid on the Emission Characteristics of Cathode Assembly

Study on the Influence of Control Grid on the Emission Chara...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Xiong, Mianzhi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Low-energy electron curtain accelerators are widely used in the field of radiation processing. In this paper, the model of the cathode emission assembly of the multi-filament electron curtain accelerator is established by CST simulation software, and the influence of the duty ratio and grid width of the semi-cylindrical control grid on the current emission characteristics of the cathode assembly is explored. It is found that the larger the duty ratio of the control grid and the wider the mesh grid width, the emission current and the current drawn at control grid increase. Especially when the width of mesh grid reaches 3mm, the current emission characteristics of the cathode assembly no longer conform to the three-half law. The research work in this paper has reference significance for the construction and design of cathode assembly. © 2024 IEEE.

关键词： Field emission cathodes

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