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6th Asia Conference on Energy and Electrical Engineering, ACEEE 2023

作者： Liu, Qiangqiang Du, Xiong Wang, Zhenye Ren, Hongyu Zhou, Junjie Chen, Rui Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350312690

Junction temperature (Tj) is a critical parameter for condition monitoring and lifetime assessment of SiC MOSFETs. As one of the temperature-sensitive electrical parameters (TSEPs), the on-state drain-source resistance (Ron) can be calculated by measuring Vds and Id, making it a widely used Tj indicator in SiC MOSFETs. However, the relationship between Ron and Tj may change with aging of SiC MOSFETs, leading to errors in Tj estimation. Therefore, an improved SiC MOSFETs Tj estimation method considering the influence of aging is proposed to eliminate this error. Back Propagation Neural Network (BPNN) is employed to map the work accumulation to an aging factor, so that to correct the result of Ron-based Tj estimation method. To validate proposed method, a dc power cycling test platform is built. The number of power cycles is taken as work accumulation, which represents the aging state of SiC MOSFETs. The test results shows that the Ron-based Tj estimation method without correction of can result in errors of up to 18°C after 6337 power cycles. However, the proposed method is able to reduce the errors to less than 2°C at the same aging state, confirming the effectiveness of the proposed method. © 2023 IEEE.

关键词： Junction temperature

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Study on Stress Field Distribution and Size Influence Characteristics of Bellows in GIS Equipment

Study on Stress Field Distribution and Size Influence Charac...

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

作者： Li, Ying Hao, Jian Ding, Yilin Liu, Qingsong Li, Xu Zhong, Yao Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350311358

Due to installation errors, expansion and contraction of materials, or foundation settlement, GIS equipment is prone to accidents such as cylinder cracks, support tilt and gas leakage when the bellows are improperly deployed. Therefore, it is of great significance to understand the stress distribution characteristics of bellows and its influencing factors for ensuring the operation safety of GIS equipment. In this paper, stress field simulation research was carried out for GIS bellows, the stress and deformation displacement distribution of GIS bellows were solved, and the influence of wall thickness and wave height on the distribution characteristics of stress and deformation displacement of GIS bellows was studied. The results show that: the stress distribution of the bellows is large at both ends and small in the middle and the stress of the wave crest structure is less than that of the wave trough structure;The distribution of deformation displacement is large in the middle and small at both ends, and the deformation displacement of wave crest structure is larger than that of wave trough structure;in a certain range, reducing the wall thickness and increasing the wave height can reduce the maximum stress value of bellows and improve the temperature compensation ability of bellows. These conclusions provide some guidance for the design and selection of bellows. © 2023 IEEE.

关键词： Finite element method

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Outage Analysis of Optimal UAV Cooperation with IRS via Energy Harvesting Enhancement Assisted Computational Offloading

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1885-1905页

作者： Baofeng Ji Ying Wang Weixing Wang Shahid Mumtaz Charalampos Tsimenidis School of Information Engineering Henan University of Science and TechnologyLuoyang471000China Research and Innovation Center of Intelligent System Longmen LaboratoryLuoyang471000China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Sustainable Digital Communications and Energy Systems(DIGCOM)Group Nottingham Trent UniversityNottinghamUK

The utilization of mobile edge computing(MEC)for unmanned aerial vehicle(UAV)communication presents a viable solution for achieving high reliability and low latency *** study explores the potential of employing intelligent reflective surfaces(IRS)andUAVs as relay nodes to efficiently offload user computing tasks to theMEC server system ***,the user node accesses the primary user spectrum,while adhering to the constraint of satisfying the primary user peak interference ***,the UAV acquires energy without interrupting the primary user’s regular communication by employing two energy harvesting schemes,namely time switching(TS)and power splitting(PS).The selection of the optimal UAV is based on the maximization of the instantaneous signal-to-noise ***,the analytical expression for the outage probability of the system in Rayleigh channels is derived and *** study investigates the impact of various system parameters,including the number of UAVs,peak interference power,TS,and PS factors,on the system’s outage performance through *** proposed system is also compared to two conventional benchmark schemes:the optimal UAV link transmission and the IRS link *** simulation results validate the theoretical derivation and demonstrate the superiority of the proposed scheme over the benchmark schemes.

关键词： Unmanned aerial vehicle(UAV) intelligent reflective surface(IRS) energy harvesting computational offloading outage probability

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Enhancing crystal integrity and structural rigidity of CsPbBr_(3) nanoplatelets to achieve a narrow colorsaturated blue emission

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Light(Science & Applications) 2024年第5期13卷 985-997页

作者： Qianqian Huang Wenxu Yin Bo Gao Qingsen Zeng Dong Yao Hao Zhang Yinghe Zhao Weijia Zheng Jiaqi Zhang Xuyong Yang Xiaoyu Zhang Andrey L.Rogach Key Laboratory of Automobile Materials MOE School of Materials Science&Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchunChina. State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina. State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina. Department of Chemistry University of VictoriaVictoriaBCCanada. Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghaiChina. Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.RChina

Quantum-confined CsPbBr_(3) perovskites are promising blue emitters for ultra-high-definition displays,but their soft lattice caused by highly ionic nature has a limited ***,we endow CsPbBr_(3) nanoplatelets(NPLs)with atomic crystal-like structural rigidity through proper surface engineering,by using strongly bound N-dodecylbenzene sulfonic acid(DBSA).A stable,rigid crystal structure,as well as uniform,orderly-arranged surface of these NPLs is achieved by optimizing intermediate reaction stage,by switching from molecular clusters to mono-octahedra,while interaction with DBSA resulted in formation of a Cs_(x)O monolayer shell capping the NPL *** a result,both structural and optical stability of the CsPbBr3 NPLs is enhanced by strong covalent bonding of DBSA,which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand ***,rather small amount of DBSA ligands at the NPL surface results in a short inter-NPL spacing in their closely-packed films,which facilitates efficient charge injection and *** photoluminescence of the produced CsPbBr_(3) NPLs is bright(nearly unity emission quantum yield)and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K,while the bandwidth of the electroluminescence(peaked at 460 nm)also reaches a record-narrow value of 15 nm at room *** value corresponds to the CIE coordinates of(0.141,0.062),which meets Rec.2020 standards for ultra-high-definition displays.

关键词： temperature stability narrow

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Interaction Mechanism Analysis and Synchronization Stability Control for Paralleled PLL-VSCs system during LVRT

Interaction Mechanism Analysis and Synchronization Stability...

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

作者： Huang, Sen Yao, Jun Lin, Yongchao Luo, Yi Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350311358

Due to the weak immunity of power electronic devices, the phase-locked loop-synchronized voltage source converters (PLL-VSCs) face severe transient instability risk during low voltage ride through (LVRT). Unlike the existing research, this paper takes a paralleled PLL-VSCs system as the study object and discusses the interaction mechanism between the PLL-VSCs. It is found that the interaction between PLL-VSCs is determined by the mutual-impedance voltage drop, which is mainly affected by different current injection angles during LVRT. And then, in order to ensure the best transient stability of the paralleled system, a current optimization control strategy is proposed. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed strategy are validated by simulations. © 2023 IEEE.

关键词： Transients

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Investigation of Non-local Thermodynamic Equilibrium Effects of Medium Voltage AC Air Arc 4

Investigation of Non-local Thermodynamic Equilibrium Effects...

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4th IEEE International Conference on Electrical Materials and Power Equipment, ICEMPE 2023

作者： Zhou, Tong Yang, Qing Yuan, Tao Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350334678

The medium-voltage (MV) power distribution networks have a complex topology, and this can easily cause air arc faults. However, the current of the air arc is low, and the arc temperature is only a few thousand Kelvin. In this case, the arc is in non-local thermodynamic equilibrium (non-LTE). The LTE state of arc is the basis for the establishment of arc model and the calculation of transport coefficient. In this paper, the non-LTE effect of the MV AC air arc is studied by the moiré deflection and the optical emission spectroscopy (OES) techniques. © 2023 IEEE.

关键词： Optical emission spectroscopy

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Power Loss Assessment of Three-Level Neutral-Point-Clamped Inverter With DPWM Modulation 6

Power Loss Assessment of Three-Level Neutral-Point-Clamped I...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Luo, Ming Zou, Mingrui Niu, Fuli Liang, Yuxi Sun, Peng Zeng, Zheng Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350346671

The three-level neutral-point-clamped (3L NPC) inverter is widely employed for the renewable energy application. To achieve lower life cycle cost, the efficiency of 3L NPC inverter is highlighted. Compared to the continuous PWM (CPWM) modulation, the discontinuous PWM (DPWM) modulation is preferred to reduce switching and conduction losses. Nevertheless, the power loss assessment of the DPWM modulation is a remaining challenge for the 3L NPC inverter. In this paper, the general mathematical model of the DPWM modulations is created to quantify the power loss of the 3L NPC inverter. The duty cycles of the power device are modeled for the unipolar and bipolar CPWM modulations, even for the DPWM modulations of the 3L NPC inverter. Moreover, the switching and conduction losses of the 3L NPC inverter are analyzed, considering different CPWM and DPWM modulations. The experimental test rig and switching trajectory are presented to observe the specific loss of the commercial 3L NPC power module. Besides, comprehensive comparisons of the power loss dependent on PWM modulation are demonstrated for the 3L NPC inverter. It is found that the theoretical predictions of the proposed model are consistent with the simulated results of the PLCES tool. Due to the optimal power loss, the DPWM1 is recommended for the 3L NPC inverter application. The methodologies and findings in this paper are also helpful for the 3L T-type NPC (TNPC) and active NPC (ANPC) inverter application. © 2023 IEEE.

关键词： Pulse width modulation

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Vision Based Surface Defect Detection of Long-Distance and Steep-Slope FAST Cable

Vision Based Surface Defect Detection of Long-Distance and S...

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International Conference on Wireless Communications, Networking and Applications (WCNA 2022)

作者： Tong, Xin Zhang, Xuehe Liu, Gangfeng Li, Changle Zhao, Jie Harbin Institute of Technology Heilongjiang Harbin15000 China State Key Laboratory of Robotics and System Harbin China

ISBN: (纸本)9789819939503

Aiming at problems of long-distance and steep-slope FAST (Five-hundred-meter Aperture Spherical radio Telescope) cable detection, a set of vision system and its processing method based YOLOX are proposed. This system overcomes many difficulties such as collecting high-altitude samples and complex background environment in FAST cable detection tasks, and It achieves the accurate positioning and classification of defects. Good detection effects have been achieved for multi-morphology, multi-scale, especially small defects. The defect detection system was validated on three defect data sets which could affect the normal use of the cable, and the accuracy is 91.7%. Thus the system and method can meet the efficiency and accuracy requirements of FAST cable detection, and it can also be practically applied to other various cables. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cables

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Giant infrared bulk photovoltaic effect in tellurene for broad-spectrum neuromodulation

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Light(Science & Applications) 2024年第11期13卷 2812-2823页

作者： Zhen Wang Chunhua Tan Meng Peng Yiye Yu Fang Zhong Peng Wang Ting He Yang Wang Zhenhan Zhang Runzhang Xie Fang Wang Shuijin He Peng Zhou Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina State Key Laboratory of ASIC and System Department of MicroelectronicsFudan UniversityShanghaiChina University of Chinese Academy of Sciences BeijingChina School of Life Science and Technology ShanghaiTech UniversityShanghaiChina School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhanChina Shanghai Clinical Research and Trial Center ShanghaiChina

Given the surpassing of the Shockley-Quiesser efficiency limit in conventional p-n junction photovoltaic effect,bulk photovoltaic effect(BPVE)has garnered significant research ***,the BPVE primarily focuses on a narrow wavelength range,limiting its potential *** we report a giant infrared bulk photovoltaic effect in tellurene(Te)for broad-spectrum *** generated photocurrent in uniformly illuminated Te excludes other photoelectric effects and is attributed to the *** bulk photovoltaic wavelength in Te spans a wide range from the ultraviolet(390 nm)to the mid-infrared(3.8μm).Moreover,the photocurrent density of 70.4 A cm^(−2) under infrared light simulation outperforms that in previous ultraviolet and visible semiconductors as well as infrared *** attached to the dendrites or somata of the cortical neurons successfully elicit action potentials under broad-spectrum light *** work lays the foundation for the further development of infrared BPVE in narrow bandgap materials.

关键词： effect spectrum ultraviolet

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Research on Lifetime Evaluation of IGBT Module in Wave Energy Converter Considering Environmental Uncertainty 6

Research on Lifetime Evaluation of IGBT Module in Wave Energ...

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6th Asia Conference on Energy and Electrical Engineering, ACEEE 2023

作者： Jia, Dongqiang Wang, Jing Du, Xiong Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350312690

Insulated gate bipolar transistors (IGBTs) are one of the weak links of the wave energy converter. Accurate lifetime evaluation is an important support for the reliable operation of the wave energy conversion system. However, the impact of operating environment uncertainty wasn't consider in the current IGBT module lifetime evaluation model. This paper proposes a lifetime evaluation model of IGBT module considering environmental uncertainty, which effectively simulates the uncertainty of environmental temperature and wave energy power generation and improves the accuracy of lifetime evaluation results. Firstly, the Monte Carlo method is used to generate a large number of random scenarios to simulate the uncertainty of operating environment, and the scenario reduction method is introduced to extract typical operating scenarios. The scenario generation scenario and reduction fully balance the contradiction between accuracy and computational complexity of lifetime evaluation model. Secondly, the mission profile is divided into different time scales, and the influence of low frequency junction temperature and high frequency junction temperature on the life loss of IGBT module is quantitatively analyzed. Finally, the effects of different lifetime evaluation methods are compared by simulation, and the simulation results show that the proposed lifetime evaluation model has higher accuracy. © 2023 IEEE.

关键词： Junction temperature

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