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2024 3rd International Youth Scientist Forum - Academic Symposium on New Energy and New Material, IYSF-NENM 2024

作者： Han, Qigao Wang, Fuhe Wang, Fengqian Ji, Shuaijing Zhong, Jun Du, Jinqiao Tian, Jie Zhang, Weixin Tang, Shun Cao, Yuancheng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Shenzhen Power Supply Co. Ltd. Shenzhen518001 China

Li7La3Zr2O12 composite solid-state electrolytes (LLZO CSSEs) face severe application challenges due to the effect of grain boundary impedance. For this reason, the ionic conduction blocking effect caused by the polymer is mitigated by a dry process while reducing the polymer content. When paired with the designed fluorinated electrolyte, the ionic conductivity of the LLZO CSSEs reach 1.52 mS cm-1, exhibiting a significant ionic conduction synergistic effect. The wide electrochemical stabilization window and better flame retardancy can guarantee the stable application of LLZO CSSEs in lithium-metal batteries, and the lithium symmetric batteries can be stably cycled more than 1000 hours under the current density of 1 mA cm-2. The Li|LiNi0.8Co0.1Mn0.1O2 solid-state batteries achieved a better rate performance with the specific capacity of 128.50 mAh g-1 under the current of 5 C. These results indicate that LLZO CCSEs have the potential for further applications and are contributed to the development of lithium-metal batteries. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Solid-state Batteries

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Study on Double Feedforward Control Strategy for Three-Level Buck-Boost Bi-Directional Converter Applied in Energy-Storage Inverters 11th

Study on Double Feedforward Control Strategy for Three-Level...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Zhou, Chijun Fang, Yu Chen, Jie Li, Rui Shu, Kaixin Wang, Xuehua College of Information Engineering Yang Zhou University Yang Zhou China College of Electrical Energy and Power Engineering Yang Zhou University Yang Zhou China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819788156

This paper focuses on the three-level Buck-Boost Bi-directional converter (TL Buck-Boost BDC) applied in energy-storage inverters serving as charging or discharging circuit for storage battery. Based on the traditional dual closed-loop control method, a dual feedforward control strategy based on the balanced duty cycle signal at the midpoint of the direct current bus (DC Bus) and the battery voltage duty cycle signal is proposed. The balanced duty cycle signal at the midpoint of the DC Bus is generated by the balanced feedforward generator, and the battery voltage duty cycle signal is generated by the battery voltage feedforward generator. These two duty cycle signals are superimposed with the duty cycle signal generated by the dual closed-loop control to construct the duty cycle signal used to control the switching on or off of the switches in the TL Buck-Boost BDC, thereby achieving stable control of the charging or discharging operation in the energy-storage inverter while ensuring the DC-Bus voltage, Realized DC-Bus midpoint balance and improving the dynamic response speed of the system. The control parameters of the TL Buck-Boost BDC is designed, and the correctness and reliability of the method studied in this paper is verified by experimental results. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Buck converter

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Inherent Switching Reallocated CPS-PWM with Improved Voltage Balancing for MMC

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IEEE Transactions on Power Electronics 2025年

作者： Peng, Li Ying, Yuxuan Wang, Zhen Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

Modular multilevel converter is an attractive solution in medium or high voltage applications, and voltage balancing is one of the most significant technical problems especially for CPS-PWM based MMCs. To solve this problem, in this paper, an inherent switching reallocated CPS-PWM is proposed for MMC. Based on arm current directions, switching states of sub-modules (SMs), voltage sorting and carrier sorting results, proposed method divides SMs and carriers into inserting and bypassing groups for each, enabling switching reallocation within these four co-optimized groups to inherently balance capacitor voltages. This effectively prevents additional switchings. Besides, most computations of the proposed CPS-PWM are logical operations implemented in FPGA, so proposed method can achieve reallocation frequency equal to sampling frequency. Unlike other CPS-PWM based methods for voltage balancing, the inherent switching reallocated CPS-PWM not only has superior converge speed in dynamic processes which accommodate a wide power range, but also has excellent balancing accuracy especially considering capacitance differences. Owing to appropriate reallocation principles, the proposed CPS-PWM has lower switching loss compared to existing carrier reallocation methods. Finally, the feasibility and superiority of the proposed method are validated by simulation and experiment results. © 1986-2012 IEEE.

关键词： Compressed sensing

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Coordinated Control Strategy for Multi Hybrid Active Power Filters

Coordinated Control Strategy for Multi Hybrid Active Power F...

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2025 International Conference on Electrical Automation and Artificial Intelligence, ICEAAI 2025

作者： Wang, Chen Yang, Bo Wu, Yutong Li, Mingshu Li, Xingyang Yin, Jingyuan State Grid Beijing Electric Power Company Beijing China Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology Jinan China

ISBN: (纸本)9798331506797

With the development of new power systems and power electronics technology, the power system in the 'double high' scenario faces certain challenges in harmonic control. To achieve precise real-time control of harmonics, this article proposes a collaborative control strategy for multi hybrid active power filters (HAPF). Based on Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistor (SiC-MOSFET) novel power components, a modular HAPF was constructed, the active and passive parts were connected through coupling inductance to output effective compensation current. To achieve real-time and accurate detection of harmonics, an adaptive filter is constructed by combining Least Mean Square (LMS) and Least Mean Squared (LMF) method, and adaptively update the weight step size based on the error results. A coupling evaluation index was constructed by introducing the relative gain matrix (RGA), considering the compensation performance, capacity allocation, and coupling effects of each HAPF, the optimal allocation of compensation current for each device is determined. The simulation results showed that the proposed method can accurately detect and compensate for system harmonics through collaborative control of multiple HAPF, thereby improving the power quality of the power system. © 2025 IEEE.

关键词： Adaptive harmonic detection Cooperative Control HAPF Harmonic compensation RGA

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Thermal Balance-Based Evaluation Method for Safe Operating Areas and Its Degradation of IGBT Power Module

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2025年

作者： Han, Tongyao Luo, Yifei Liu, Binli Yuan, Hao Shi, Zenan Naval University of Engineering National Key Laboratory of Electromagnetic Energy China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430033 China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an710049 China

Insulated gate bipolar transistors (IGBTs) power module experience significant thermal stress during short-time overload conditions, and their electro-thermal characteristics exhibit strong nonlinearities. As a result, the two-dimensional safe operating area (SOA) provided in the datasheet is unable to meet the need of device reliability assessments. In this paper, we propose a quantitative assessment method based on the thermal balance principle to define the SOA for IGBTs and assess its degradation. A three-dimensional SOA that incorporates voltage, current, and junction temperature is established to prevent IGBT from thermal failures. The proposed SOA indicates that IGBT can operate safely at more than twice the rated current, and the junction temperature can exceed 448.15K(175° C) without thermal failures. This work provides theoretical support for IGBT application design and reliability assessment. According to the physical mechanisms associated with thermal failures of IGBT power module, a criterion to characterize the thermal instability of devices is established. Further, the net heat flux analysis model that integrates semiconductor physics with heat conduction theory is established, enabling the formulation of the three-dimensional SOA of IGBT. Moreover, the effects of the degradation of electro-thermal characteristics on the SOA throughout the long-term operation of the device is considered. In addition, an electro-thermal coupling model that simulates the electro-thermal characteristics of the device is established. The results from both simulation and experiment demonstrate that the established SOA and its degradation effectively predict the reliability of the IGBT under short-time overload conditions. © 2013 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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MIDC system voltage support capability evaluation index with renewable energy sources

MIDC system voltage support capability evaluation index with...

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2024 International Conference on Energy technology and Electrical Power, ETEP 2024

作者： Huang, Qiyuan Wu, Jinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hunan Electric Power Co. Ltd. Power Research Institute China

ISBN: (纸本)9781510690400

Renewable energy sources (RES) connected to the receiving end of the multi-infeed HVDC (MIDC) system will affect the node voltage support capability, which in turn affects the voltage stability of the power grid. To reasonably evaluate the voltage support capability of RES integrated MIDC systems, firstly, the structural characteristics of the MIDC system and the amplitude and phase characteristics of different types of RES are analyzed. Secondly, based on the traditional short circuit ratio index combined with the RES amplitude and phase characteristics, the multi-infeed transient short circuit ratio (MITSCR) is defined, and the method of analyzing the voltage support capability of MIDC system is proposed. Finally, time-domain simulation analysis is carried out using PSACD/EMTDC, and the results show that the MITSCR can effectively characterize the node voltage support capability. © 2025 SPIE.

关键词： MIDC system renewable energy sources short circuit ratio voltage support ability

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Visible-light optical phased array on a thin-film lithium niobate platform for high-speed beam steering

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Optics Letters 2025年第9期50卷 3090-3093页

作者： Ye, Yongqi Lian, Daixin Chen, Zhansheng Dong, Yantao Bai, Gang Li, Bei Song, Yiwei Zhao, Shi Wu, Jiachen Chen, Jingye Dai, Daoxin Shi, Yaocheng State Key Laboratory for Extreme Photonics and Instrumentation Center for Optical and Electromagnetic Research International Research Center for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou310058 China Shanghai Academy of Spaceflight Technology Research Shanghai201100 China Shanghai Radio Equipment Research Institute Shanghai201100 China

We demonstrate a visible-light optical phased array (OPA) realized on a thin-film lithium niobate (TFLN) platform. The OPA chip integrates 32 channels and independently modulates the phase of each channel through an electro-optic phase shifter for the first time, to our knowledge, exhibiting a rapid response speed. The electro-optic rising edge response time is 12 ns, while the falling edge response time is 14 ns. Additionally, a combination of non-periodic arrays and a slab grating is employed to suppress the grating lobes of far-field beams, thereby achieving a large field of view (FOV) and a small beam divergence. A 32-channel OPA has been demonstrated, showing a FOV of 40° and a beam divergence of 0.41° in the phase tuning direction at 633 nm. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Beam steering Free space optics Lithium niobate Phase modulation Phased arrays Scanning electron microscopy

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Comparative Study of CCPS Based on Permanent Magnet and Electrically Excited HIA for Selecting Rational Topological Structure

CPSS Transactions on Power Electronics and Applications

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CPSS Transactions on Power Electronics and Applications 2025年第1期10卷 66-84页

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

In order to facilitate the selection of an optimal topological structure for rational pulsed capacitor charging power supplies (CCPS), this paper presents a comparative analysis of CCPS based on permanent magnet excited (PME) and electrically excited (EE) homopolar inductor alternators (HIA). The findings indicate that the d-axis transient inductance of the PME HIA is marginally greater than that of the EE HIA, a result that contradicts initial expectations. Notably, the PME HIA does not require consideration of transient flux variations, whereas the EE HIA does. The study establishes relationships among the enhancement of charge performance, efficiency, capacitance, frequency, and field winding (FW) resistance. It is observed that as capacitance, frequency, and FW resistance increase, there is a corresponding improvement in charge performance. The equipotential line representing the enhancement of charge performance approximates an inverse proportional function, suggesting that if the product of FW resistance and capacitance, or the product of FW resistance and frequency, remains constant, the improvement in charge performance will also be constant. Furthermore, it is noted that as capacitance and frequency increase, the improvement in efficiency diminishes, which is contrary to the trend observed in charge performance. To comprehensively evaluate the enhancement of charge performance and efficiency, a weighted function is proposed. This function aids in the selection of a rational topological structure for CCPS, distinguishing between those based on PME HIA and those based on EE HIA. Based on the results derived from the weighted improvement analysis, appropriate topological structures for CCPS can be identified according to varying capacitance, frequency, and FW resistance. Specifically, when the product of capacitance and FW resistance, or the product of frequency and FW resistance, is substantial, the PME HIA is recommended; conversely, the EE HIA is preferred

关键词： Transient analysis Resistance Capacitance Inductance Capacitors Power system measurements Density measurement Magnetic fields Windings Iron

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Deciphering Water Oxidation Catalysts:The Dominant Role of Surface Chemistry over Reconstruction Degree in Activity Promotion

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Nano-Micro Letters 2025年第3期17卷 340-354页

作者： Li An Jianyi Li Yuanmiao Sun Jiamin Zhu Justin Zhu Yeow Seow Hong Zhang Nan Zhang Pinxian Xi Zhichuan J.Xu Chun‑Hua Yan State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceFrontiers Science Center for Rare IsotopesCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000People’s Republic of China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Faculty of Materials Science and Energy Engineering Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Key Laboratory of Electromagnetic Materials and Devices National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyElectron Microscopy CenterYunnan UniversityKunming 650091People’s Republic of China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030People’s Republic of China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU‑HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryPeking UniversityBeijing 100871People’s Republic of China

Water splitting hinges crucially on the availability of electrocatalysts for the oxygen evolution *** surface reconstruction has been widely observed in perovskite catalysts,and the reconstruction degree has been often correlated with the activity ***,a systematic study on the roles of Fe substitution in activation of perovskite LaNiO_(3)is *** substituting Fe content influences both current change tendency and surface reconstruction ***_(0.9)Fe_(0.1)O_(3)is found exhibiting a volcano-peak intrinsic activity in both pristine and reconstructed among all substituted perovskites in the LaNi_(1-x)Fe_(x)O_(3)(x=0.00,0.10,0.25,0.50,0.75,1.00)*** reconstructed LaNi_(0.9)Fe_(0.1)O_(3)shows a higher intrinsic activity than most reported NiFe-based ***,density functional theory calculations reveal that Fe substitution can lower the O 2p level,which thus stabilize lattice oxygen in LaNi0.9Fe0.1O3 and ensure its long-term ***,it is vital interesting that activity of the reconstructed catalysts relied more on the surface chemistry rather than the reconstruction *** effect of Fe on the degree of surface reconstruction of the perovskite is decoupled from that on its activity enhancement after surface *** finding showcases the importance to customize the surface chemistry of reconstructed catalysts for water oxidation.

关键词： Oxygen evolution reaction Perovskite oxides Doping Activation and reconstruction

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Study on the Characteristics and Mechanism of Discharge Degradation Products of Epoxy Resin Matrix in Composite Insulators Under Humid Air Environment 19th

Study on the Characteristics and Mechanism of Discharge Degr...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Zhiyu, Wan Dandan, Zhang Chao, Gao Ming, Lu Hui, Li Zhenbiao, Li Kexin, Shi School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China Henan Jiuyu EPRI Electric Power Technology Co. Ltd. Zhengzhou450052 China

ISBN: (纸本)9789819613823

The degradation of the epoxy resin matrix in the core rods of composite insulators is the primary factor leading to decay-like deterioration and fracture accidents. Partial discharge in a humid environment is a critical trigger for this phenomenon. As an organic polymer, epoxy resin is prone to degradation under discharge, producing complex degradation products that can have secondary effects on surrounding materials, further accelerating the decay-like deterioration process. To optimize the formulation and manufacturing process of composite insulator materials and mitigate or even prevent decay-like fractures, it is crucial to study the discharge degradation products and mechanisms of the epoxy resin matrix. In this study, discharge experiments were conducted on anhydride-cured bisphenol A epoxy resin used in composite insulators within a closed humid environment. Changes in chemical functional groups of solid samples before and after discharge were analyzed from the high-frequency region to the fingerprint region. The main components and relative yields of liquid and gaseous discharge products were detected, and the primary reaction mechanisms during the discharge degradation process were thoroughly investigated. Results indicate that partial discharge in humid air induces instantaneous temperature rise and radical action, leading to epoxy resin degradation, generating alcohols and hydroxyl groups, which may increase the material’s hydration capacity and surface conductivity, thereby reducing electric field uniformity. Gaseous products such as methane, acetone, ethylene, and ethyl acetate produced by discharge pyrolysis may exacerbate stress at the core rod and sheath interface, increasing the risk of interfacial damage. Liquid products like nitric acid, carboxylic acids, and acetone may accelerate glass fiber fracture and sheath swelling. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Partial discharges

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