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Enhanced Dynamic Phase Stability and Suppressed Mn Dissolution in Low-Tortuosity Spinel LMO Electrode

能源材料前沿（英文） 2023年第3期2023卷 193-201页

作者： Renjie He Sheng Lei Mengchuang Liu Mingsheng Qin Wei Zhong 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 State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Microspinel LiMn204(LMO)is a widely used cathode material in power lithium-ion ***,inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during ***,a low-tortuosity LMO(LMO-LT)electrode is fabricated by an ice-templating method,which exhibits enhanced dynamic phase stability,alleviated Mn dissolution,and rare particle microcracks during *** is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization,leading to uniform electrochemical reaction within microregions of the LMO-LT ***,the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO *** a result,the full cell[negative-to-positive capacity ratio(N/P)=1.1]with thick LMO-LT cathode(13 ***-2)and Li4Ti5O12 anode sustains 80.0％capacity over 200 *** LMO-LT electrode further delivers 78.9％capacity of that at 0.1 C at the high rate of 5 *** work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale,promoting the development of high-performance LMO electrodes.

关键词： stability electrode dynamic phase dissolution enhanced low-tortuosity spinel suppressed

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Fault line selection in cooperation with multi-mode grounding control for the floating nuclear power plant grid

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Protection and Control of Modern Power Systems 2020年第1期5卷 184-193页

作者： Yikai Wang Xin Yin Wen Xu Xianggen Yin Minghao Wen Lin Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Electrical Engineering and Electronics The University of LiverpoolLiverpool L693BXUK

The Floating nuclear power plant grid is composed of power generation,in-station power supply and external power *** ensure the safety of the nuclear island,the in-station system adopts a special power supply mode,while the external power supply needs to be adapted to different types of external *** of frequent single phase-ground faults and various fault forms,the fault line selection protection should be accurate,sensitive and *** paper presents a fault line selection method in cooperation with multi-mode grounding *** on the maximum united energy entropy ratio(MUEER),the optimal wavelet basis function and decomposition scale are adaptively chosen,while the fault line is selected by wavelet transform modulus maxima(WTMM).For high-impedance faults(HIFs),to enlarge the fault feature,the system grounding mode can be switched by the multi-mode grounding *** on the characteristic of HIFs,the fault line can be selected by comparing phase differences of zero-sequence current mutation and fault phase voltage mutation before and after the *** results using MATLAB/Simulink show the effectiveness of the proposed method in solving the protection problems.

关键词： Floating nuclear power plant Multi-mode grounding control Wavelet transform modulus maxima(WTMM) Maximum united energy entropy ratio(MUEER) Phase difference Single phase-ground fault

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A general coordination scheme for zero-sequence current differential protection on series-compensated multi-circuit line 4

A general coordination scheme for zero-sequence current diff...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Huang, Zongchao Li, Yinhong Huazhong University of Science Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728196060

The present study of zero-sequence current differential protection (ZCDP) with series compensation has not considered the equivalent impedance characteristic of series compensation, and meanwhile cannot put forward a universal coordination scheme feasible for multi-circuit lines. In this paper, the equivalent impedance characteristic of the series capacitor (SC) device and the effect of SC on the operating characteristics of ZCDP under single-circuit and multi-circuit conditions are analyzed. Based on the analysis, a general coordination scheme for ZCDP on series-compensated multi-circuit line is proposed, of which the presented sensitivity coefficient is able to reflect the sensitivity of current differential protection. A power grid experiment is used to demonstrate the correctness of the analysis and the effectiveness of the proposed scheme. © 2020 IEEE.

关键词： Timing circuits

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Reinforcement learning for optimal allocation of superconducting fault current limiters

Reinforcement learning for optimal allocation of superconduc...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Ling, Xiejin Li, Yinhong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728155081

Superconducting fault current limiter (SFCL) is a new type of current limiting equipment that can restrict the short circuit current level in power systems without impacting on their normal operations. However, the existing SFCL allocation methods have disadvantages of long computation and unstable convergence. Recent advances in the area of artificial intelligence provide the possibility to achieve the optimal SFCL allocation with the consideration of both speed and convergence. To this end, the SFCL allocation is converted into a Reinforcement Learning (RL) problem in this paper. A designer to find the optimal SFCL allocation is viewed as an agent, and the power system is regarded as the environment. The agent adjusts the location and size of SFCLs to respond to the feedback from the environment optimally. The Q-learning algorithm is applied to solve the RL problem. The experimental results demonstrate the effectiveness and superiority of the proposed method. © 2020 IEEE.

关键词： Reinforcement learning

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A coil optimization design of the horn shape for underwater wireless power transfer 16

A coil optimization design of the horn shape for underwater ...

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

作者： Zeng, Yingqin Rong, Cancan Lu, Conghui Liu, Xiaobo Liu, Minghai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839533914

In the application scenarios of underwater wireless power transfer (WPT), a horn shape coil is proposed in this paper. Aiming to obtain the uniform magnetic field in a specific area, the horn shape coil is optimized by reasonably setting the tilt angle and the spacing of the turns. Moreover, the horn coil with optimal tilt angle and the horn coil with uneven spacing are designed. Considering the eddy current loss in seawater, the model of WPT system in seawater is established using the 3D electromagnetic simulator. Through simulation and analysis of eddy current loss under different conditions, the influence of eddy current loss on efficiency is illustrated. Finally, the transfer efficiency and output power are obtained by simulation and calculation. Also, the performance of the designed system is evaluated. It is found that the proposed system can effectively enhance the stability and anti-offset capability of WPT system, and then obtain the stable and efficient output. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Seawater

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A Three-Stage Ac Side Startup Strategy for Hybrid Mmc

SSRN

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SSRN 2022年

作者： Chen, Canfeng Zhou, Lingbo Guan, Hengyu Dong, Qiang Zhang, Kai The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Qiongtai Normal University China

When a hybrid modular multilevel converter (MMC) starts from the AC side, the capacitor voltages of full-bridge submodules (FBSMs) will be twice those of half-bridge submodules (HBSMs) in the uncontrolled charging stage due to their structural differences, making it difficult to further charge the SMs in the ensuing controlled charging stage. To solve this problem, a three-stage AC-side startup strategy for hybrid MMCs is proposed. Compared with conventional closed-loop startup strategies, it charges HBSMs and FBSMs simultaneously with the third harmonic injection method, which eliminates the inrush current. And then the HBSMs are charged separately by orthogonal decomposition of the arm voltage after FBSMs are fully charged, which avoids overcharging the FBSMs. Thus, hybrid MMCs can start from the AC side quickly without inrush current, and the unbalance between different SMs is eliminated. The necessity and feasibility of the proposed strategy are discussed in detail. Aiming at possible errors in arm voltage orthogonal decomposition and current phase tracking, control loops for HBSMs and FBSMs are derived and analyzed. Finally, the complete three-stage startup strategy is designed. Simulation results and experimental results are provided to support the theoretical analysis and validate the proposed strategy. © 2022, The Authors. All rights reserved.

关键词： Power converters

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Multifrequency Vibration Suppression of Magnetic Bearing Systems Applied Variable Step-size Automatic Learning Control 12

Multifrequency Vibration Suppression of Magnetic Bearing Sys...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Sun, Hongbo Jiang, Dong Ding, Jianfu Yang, Jichang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728158266

Active Magnetic Bearing (AMB) has been widely applied in occasions acquire high-speed rotating, high-precision machining, and so on. The AMB can provide active control force to offset centrifugal force and other disturbance to suppress vibration while rotating. This paper proposed a strategy to compensate vibration in AMB system based on Variable Step-size Automatic Learning Control (VALC). Firstly, a two degrees of freedom model of radial AMB is established. Phase error between of centrifugal force and synchronous vibration is analyzed. Then, principle and process of VALC is introduced. A generalized notch filter is applied to obtain synchronous and harmonic vibration. Next, simulations are carried out based on AMB control system applied VALC. The results of simulations show the feasibility of the compensating strategy. Experiments to reduce synchronous and harmonic vibration based on VALC are carried out on a test rig. Spectrums of vibration signals show that vibration is reduced by about 90%, which demonstrates the effectiveness of proposed strategy for vibration compensation. © 2020 IEEE.

关键词： Notch filters

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An Adaptive Driving Signals Delay Control for Voltage Balancing of Series-Connected SiC MOSFETs 12

An Adaptive Driving Signals Delay Control for Voltage Balanc...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Zhao, Min Lin, Hua Wang, Tao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology WuHan China

ISBN: (纸本)9781728158266

Voltage unbalance during the switching transient is a challenge of series-connected silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET). Adjusting the delay time of the device's drive signals is an effective method for voltage balancing. However, the relationship between the delay time and the drain-source differential voltage is greatly affected by the load current, so it is difficult for proportional-integral (PI) controller to meet the requirements of practical work situations where the load current changes inevitably. In order to solve this problem, this paper proposes an adaptive control method. This method can adjust the controller's parameters in real time according to the load current, so as to achieve a reliable voltage balancing. Experimental results are presented to verify the practicability and flexibility of this method, meanwhile, the robustness of the system improved by applying this strategy. © 2020 IEEE.

关键词： Silicon carbide

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An Accurate Fault-Location Method for Distribution Network with Distributed Generators Based on Multi-Terminal Traveling Wave

An Accurate Fault-Location Method for Distribution Network w...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Qiao, Jian Yin, Xianggen Liu, Xiangyu Wang, Yikai Xu, Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728191645

Since more and more distributed generators (DGs) are connected into the low voltage distribution network, the existing fault-location methods are difficult to achieve accurate fault location due to its decentralized power supply characteristics. Aiming at this problem and the shortcomings of the existing traveling-wave fault-location methods, this paper proposes an accurate fault-location method for distribution networks with DGs based on multi-terminal traveling wave. Firstly, this paper analyzes the impact of DGs on the first arrival times of the fault-generated traveling waves. Secondly, a set of fault distance data independent of traveling-wave velocity are calculated by using the traveling-wave time information of all detectors, and the faulted branch is identified based on the discrete degree of this set of data. Finally, the quartile method is used to reject the bad data, and the accurate fault distance of the fault point is obtained. Simulation results show that the proposed method can accurately locate the fault point, hardly impacted by traveling-wave velocity, and has good robustness to arrival time errors. © 2020 IEEE.

关键词： Wave propagation

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Fault-Tolerant Control of Five-Phase Open-End Induction Machine Drive with A Floating Capacitor 12

Fault-Tolerant Control of Five-Phase Open-End Induction Mach...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Sun, Xiangwen Liu, Zicheng Jiang, Dong Li, An Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728158266

Based on the control of the five-phase open-end winding induction motor (OEWIM) drive system, where the main and floating inverters are supplied by a DC power and a floating capacitor respectively, an open-phase fault-tolerant strategy is proposed by taking advantage of multiple degrees of freedom. Without extra hardware-assisted expense, the fault-tolerant strategy ensures the smooth output torque and stable floating capacitor voltage when the open-circuit fault occurs on the inverter legs or stator windings. Experimental results are presented to verify the effectiveness of the proposed fault-tolerant strategy. © 2020 IEEE.

关键词： Induction machine

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