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Range extended SP-iToF LiDAR with time-gated and spatially fused imaging

OPTICS EXPRESS 2024年第19期32卷 32597-32611页

作者： Zeng, Yinong Li, Chong Yi, Zihan Wang, Ziyang Hao, Huiz Qiu, Jian Liu, Kefu Chang-Hasnain, Connie J. Fudan Univ Sch Informat Sci & Engn 2005 Songhu Rd Shanghai 200433 Peoples R China Fudan Univ Acad Engn & Technol 220 Handan Rd Shanghai 200433 Peoples R China Berxel Photon Co Ltd Shenzhen 518071 Peoples R China Chinese Univ Hong Kong Shenzhen 518172 Peoples R China

Light detection and ranging (LiDAR) systems based on indirect time-of-flight (iToF)sensors have garnered considerable interest due to their all-solid-state design, high resolution,high reliability, and cost-effective nature. However, the challenge of extending the operationalrange of iToF LiDAR systems without compromising the range precision is a significant barrierto their broader application. This paper introduces what we believe to be a novel method toovercome these hurdles, which involves pre-setting the delay between the light pulse emissionand the sensor's transfer gates to extend the operational range and utilizing spatial overlapfusion techniques to enhance the range precision. In hardware, a pulsed current driver forthe light source with adjustable peak power has been developed to accommodate the varyingpower budget demands across a longer range. Experimental results demonstrate that, under thesame signal-to-noise (SNR), the proposed method exhibits enhanced performance in range errorand range precision compared to the conventional method. Furthermore, the designed LiDARachieves 3D imaging at a distance of up to 120 meters with centimeter-level precision.

关键词： Imaging techniques Lidar Phase shift Remote sensing Three dimensional imaging Vertical cavity surface emitting lasers

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Short Binary Sequence-Based Fast Electrochemical Impedance Spectroscopy Measurement for Lithium-Ion Batteries

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IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION 2025年第1期11卷 2444-2455页

作者： Geng, Anqi Hu, Haitao Zhao, Zhaoyang Chen, Junyu Ge, Yinbo Wang, Ke He, Zhengyou Southwest Jiaotong Univ Sch Elect Engn Chengdu 611756 Peoples R China Southwest Jiaotong Univ Inst Smart City & Intelligent Transportat Chengdu 610031 Peoples R China Hong Kong Polytech Univ Dept Elect & Elect Engn Hong Kong Peoples R China

Wideband signals effectively shorten the measurement time for acquiring electrochemical impedance spectroscopy (EIS) of lithium-ion batteries (LIBs). However, the measurement accuracy and measurable frequency range are limited due to an insufficient signal-to-noise ratio (SNR). Given this issue, this article proposes a short binary sequence-based fast EIS measurement approach. First, a short inverse repeat binary sequence (SIRBS) is specially designed to enhance the SNR, especially in the low-frequency region. Then, a wideband impedance extraction algorithm based on the Airy wavelet transform is proposed to address the high-frequency measurement distortion and frequency resolution decrease caused by the SIRBS. Finally, the effectiveness of the proposed approach is verified on an EIS measurement system based on a bidirectional buck-boost converter. Under a response voltage amplitude of less than 10 mV, the proposed measurement approach requires only one disturbance period (10 s) to obtain the EIS in the frequency range of 0.1 Hz-2 kHz. The experimental results indicate that under different state-of-charge (SOC), temperatures, and aging states, the maximum normalized root mean square error (RMSE) and the normalized maximum absolute error (NMAE) are mainly maintained below 0.38% and 0.97%, respectively. Moreover, the superiority of the proposed approach is further demonstrated by comparative analyses with existing techniques.

关键词： electrochemical impedance spectroscopy (EIS) lithium-ion batteries (LIBs) Binary sequence electrochemical impedance spectroscopy (EIS) lithium-ion batteries (LIBs) wideband sig- nals

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Enhanced degradation performance and mineralization of ciprofloxacin by ionizing radiation combined with g-C3N4/CDs

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RADIATION PHYSICS AND CHEMISTRY 2023年第1期208卷

作者： He, Junhui Ye, Qi Zhu, Yi Yang, Miao Zhao, Long Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Wuhan Univ Technol Sch Chem Chem Engn & Life Sci Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Chem & Chem Engn Wuhan 430074 Peoples R China

In this study, the degradation of ciprofloxacin (CIP) was investigated in the synergetic system of electron beam irradiation (EBI) combined with graphite carbon nitride/carbon nanodots (g-C3N4/CDs). The results suggested that the presence of g-C3N4/CDs could not only promote the degradation of CIP but also significantly enhanced the mineralization ratio. At 25 kGy, the mineralization ratio increased from 18.1% to 69.0% while g-C3N4/CDs was added. Regeneration experiments revealed that the g-C3N4/CDs composite possessed good reusability. In addition to finding that the presence of CO32- , HCO3-, NO3- and NO2- obviously restrained the radiolysis process of CIP, the adding of Cl- and SO42- could also have slight inhibitory effects. The effect of various water matrices in EBI&g-C3N4/CDs systems suggested that the degradation efficiency decreased in lake and tap water. Moreover, the studies in the presence of different radical scavengers suggested that center dot OH was the main reactive species in the degradation process. The possible degradation pathway of CIP was proposed in the light of intermediate products using Liquid chromatograph-mass spectrometer (LC-MS) analysis coupled with DFT calculations.

关键词： Ciprofloxacin Heterogeneous irradiation system G-C3N4/CDs Electron beam irradiation Degradation mechanisms

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state of charge and surface temperature estimation of lithium-ion batteries on the basis of a fractional-order equivalent circuit-thermal coupling model

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IONICS 2025年第2期31卷 1405-1422页

作者： Xu, Miao Lei, Ming Hu, Haitao Southwest Jiaotong Univ Sch Elect Engn Chengdu 611756 Peoples R China Southwest Jiaotong Univ Sch Phys Sci & Technol Chengdu 611756 Peoples R China

The purpose of this study is to address the issues of significant temperature impact on lithium-ion batteries and the poor temperature adaptability of traditional models that fail to accurately estimate battery temperature. This study constructs a fractional-order equivalent circuit-thermal coupling model (FOECM-TCM), which is composed of a fractional-order equivalent circuit-thermal model and a dual-state lumped parameter thermal model. This model resolves the inaccuracy in the state of charge (SOC) and temperature estimation caused by nonlinearity, coupling, and time-variant parameters in lithium-ion battery systems. The parameters of the electrical and thermal models under US06 driving conditions were identified via fractional-order particle swarm optimization (PSO) and the genetic algorithm (GA). To address the mutual coupling of the SOC and temperature in lithium-ion batteries, this paper proposes a joint estimation method based on an electrothermal coupling model. This model integrates fractional-order theory with the extended Kalman filter (EKF) algorithm to develop a fractional-order extended Kalman filter (FOEKF). To validate the superiority of the FOECM-TCM model and the FOEKF, a comparative analysis is conducted with the traditional equivalent circuit-thermal coupling model. The FOECM-TCM model reduces the root mean square errors of SOC and surface temperature estimations by 55.9% and 9.4% and the mean absolute errors by 59.2% and 17.9%, respectively. These results demonstrate superior accuracy and responsiveness, indicating excellent precision and applicability.

关键词： Lithium-ion batteries Fractional order theory Electrothermal coupling model Temperature estimation

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Implementation of various control methods for the efficient energy management in hybrid microgrid system

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AIN SHAMS engineering JOURNAL 2023年第5期14卷

作者： Ullah, Zia Wang, Shaorong Lai, Jinmu Azam, Muhammad Badshah, Fazal Wu, Guoan Elkadeem, Mohamed R. Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan Peoples R China Zhengzhou Univ Sch Elect Engn Zhengzhou Peoples R China Jiangsu Univ Sch Energy & Power Zhenjiang Peoples R China Hubei Univ Automot Technol Sch Elect & Informat Engn Shiyan Peoples R China Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan Peoples R China Tanta Univ Fac Engn Elect Power & Machines Engn Dept Tanta Egypt King Fahd Univ Petr & Minerals KFUPM Interdisciplinary Res Ctr Renewable Energy & Power Dhahran Saudi Arabia

A hybrid microgrid is an energy system composed of multiple power sources such as photovoltaic panels, wind turbines, fossil-fuel generators, converters, battery storage systems, and an energy management system that guarantees stability and balance of the entire system. According to the system operation and the meteorological conditions, the microgrid can be linked to the electrical grid or work as a stan-dalone system. The battery storage system is the key element of the microgrid and is integrated to main-tain the load demand and better energy management using various controllers. In this paper, we presented an overview of energy management and control of the hybrid microgrid by proposing the implementation of the most cited control methods such as artificial neural network, fuzzy logic, sliding mode controller, and proportional integral derivative. Further, we addressed the solar power maximiza-tion using maximum power point tracking based on a developed artificial neural controller and compared it with the other controllers. Finally, implementing the proposed four controllers for the developed hybrid microgrid offers to find the best control strategy with multiple aspects and implications. Matlab/Simulink software was used to design a hybrid microgrid with two buses, AC Bus and DC Bus, to supply the power and fulfill the investigated load demands. The simulation is carried out for compli-cated system operation scenarios with multiple changes in system variables such as weather conditions and load demand to test the robustness of each controller. The simulation results and comparison show the performance of each control method in terms of voltage control, frequency stabilization and energy saving.(c) 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of engineering, Ain Shams Uni-versity. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Microgrid Energy management system Artificial neural network Fuzzy logic Sliding mode controller Maximum power point tracking

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A voltage-source-resistance-capacitance analysis model for capacitive rectifier system based on pulsed homopolar inductor alternator

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ELECTRICAL engineering 2025年 1-18页

作者： Liu, Long-Jian Yu, Ke-Xun Xie, Xian-Fei Kunming Univ Sci & Technol Fac Elect Power Engn Kunming 650500 Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn & Technol State Key Lab Adv Electromagnet Technol Wuhan 430074 Peoples R China

This article presents an equivalent "URC" model for the repeated-frequency capacitor charging power system (CCPS) based on a pulsed homopolar inductor alternator (HIA). In this context, "U" denotes the voltage source, "R" represents the series equivalent resistance, and "C" signifies capacitance. This model is more concise than the average-value model and fundamentally captures the impact of various parameters on charging performance. It facilitates the derivation of waveforms for charge voltage and current through waveform transformation, enabling rapid evaluation of system charging performance. Additionally, it aids in CCPS design by allowing quick and analytical assessment of whether HIA parameters meet CCPS requirements, thereby guiding efficient optimization of pulsed power system designs. The factors influencing system charging performance are analyzed, with validation provided through circuit simulations and experimental results. Initially, theoretical analysis based on the "URC" model explores relationships among charge current, charge voltage, charge time, and key influencing factors such as EMF amplitude, electrical frequency, equivalent internal inductance, and capacitance. Subsequently, valve-by-valve circuit simulations and experiments are conducted to verify these relationships. Furthermore, applications involving waveform derivation for charge voltage and current are also substantiated through valve-by-valve circuit simulations and experiments. The outcomes from both circuit simulation and experimentation align consistently with predictions made by the "URC" model.

关键词： Pulsed homopolar inductor alternator Repeated frequency capacitor charging system Voltage-source-resistance-capacitance analysis model

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THERMAL CHARACTERISTICS ANALYSIS OF MEDIUM FREQUENCY TRANSFORMER UNDER MULTIPLE WORKING CONDITIONS

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THERMAL SCIENCE 2024年第1期28卷 599-609页

作者： Huang, Pei Shen, Tong Liu, Zhenxing Dian, Renjun Xu, Wanlun Wang, Dan Wuhan Univ Sci & Technol Sch Informat Sci & Engn Wuhan Peoples R China Wuhan Univ Sci & Technol Engn Res Ctr Met Automat & Measurement Technol Minist Educ Wuhan Peoples R China Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan Peoples R China

Medium frequency transformer plays an important role in high power AC-DC transformation in power grid, due to its high power density and high loss density, it brings difficulty to heat dissipation. Thermal reliability is crucial for transformer design, different from the previous work, the thermal characteristics of MFT under different working conditions are concerned and analyzed in this paper. The temperature field model of medium frequency transformer is established, and the temperature field characteristics of medium frequency transformer at rated load, no load, overload, fluctuating overload and short circuit conditions are simulated and analyzed, the results show that with the increase of load coefficient, the winding temperature increases obviously, the allowable load coefficient of medium frequency transformer can be determined by calculating the transformer temperature at different load coefficients, which lays a foundation for thermal reliability and safe operation of medium frequency transformer.

关键词： medium frequency transformer thermal analysis temperature field transformer safety

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A Comprehensive Analysis of Metamaterial-Coupled WPT Systems for Low electromagnetic Field Leakage

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IEEE TRANSACTIONS ON electromagnetic COMPATIBILITY 2023年第1期65卷 166-176页

作者： Rong, Cancan Wang, Yuying Chen, Mengmeng Lu, Yang Wu, Zhousen Xia, Chenyang Liao, Zhijuan Liu, Xu China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Peoples R China Xiamen Univ Jiujiang Res Inst Dept Phys Xiamen 361005 Peoples R China

In this article, electromagnetic metamaterials with mu-near-zero (MNZ-MM) have been presented to explain the shielding effect in the wireless power transfer systems. First, the optimized design of the metamaterials unit cell has been carried on to achieve the near-zero permeability at the working frequency of 13.56 MHz. The equivalent circuit model of the MNZ-MM unit cell has been derived, which illustrates metamaterials with near-zero permeability have the great electromagnetic field (EMF) shielding effect. Additionally, the self- and mutual inductances associated with the resonance coils and MNZ-MM unit cells are deduced in detail. Moreover, the simplified human head model is established to investigate the magnetic field cancellation by MNZ-MM on the coil side. To evaluate the performance of the proposed MNZ-MM, the magnetic field strengths of the receiving terminal with different shielding materials have been compared in simulation. Finally, a series of experiments in real-environment are implemented to discuss the shielding effect of the MNZ-MM. The measurement results show the MNZ-MM has better performance in the swine brain sample than the ferrite and aluminum plate on the whole. With the proposed MNZ-MM, we demonstrate a maximum reduction of 17.52 dB in the leakage EMF and basically no effect on transfer efficiency.

关键词： Coils Metamaterials Inductance electromagnetics Magnetic shielding Magnetic resonance Magnetic noise Brain model electromagnetic leakage equivalent circuit model metamaterials wireless power transfer (WPT)

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Hybrid design of active and passive strategy to suppress high-frequency resonances of MMC-based system

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2024年 157卷

作者： Xu, Hailiang Liu, Chunzhen Ge, Pingjuan Gao, Mingkun China Univ Petr East China Coll New Energy Qingdao 266580 Peoples R China

In recent modular multilevel converter (MMC)-based projects, high-frequency resonance (HFR) incidents have posed severe threat to the grid security. Although the active methods have been suggested, they cannot completely eliminate the HFR risk of MMC system. The hybrid method, i.e., combining the active and passive ones may be a solution to solve the HFR problem. However, the existing hybrid methods introduce additional loss. To inhibit the HFR and reduce the loss of passive devices, a hybrid active and passive strategy is proposed. Compared to existing hybrid methods, it can effectively reduce the loss introduced by passive devices. Additionally, the parameters matching relationship between the damper and the low-pass filters is revealed, and a hybrid design approach is proposed to achieve the above goals. Finally, electromagnetic transient simulations are performed to validate the correctness of the parameter design and the effectiveness of the proposed strategy.

关键词： Modular multilevel converter (MMC) High-frequency resonance suppression Low pass filtering Passive damper Parameter design

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High Efficiency n-Type Doping of Organic Semiconductors by Cation Exchange

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advanced MATERIALS 2024年第47期36卷 e2412811页

作者： Zhao, Xiaolei Alsufyani, Maryam Tian, Junfu Lin, Yuanbao Jeong, Sang Young Han, Young Woo Yin, Yi McCulloch, Iain Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China Univ Oxford Dept Chem Oxford OX1 3TA England Korea Univ Dept Chem Seoul 02841 South Korea

Achieving efficient doping in n-type conjugated polymers is crucial for their application in electronic devices. In this study, an n-type doping method is developed based on cation exchange that maintains a high doping level while ensuring a high degree of structural order, leading to significantly improved electrical conductivity. By investigating various dopants and ionic liquids, it is discovered that the choice of dopant influences doping efficiency, while the selection of ionic liquid affects cation exchange efficiency. Through careful selection of suitable dopants and ionic liquids, High doping levels are achieved remarkably in a short period, resulting in the highest conductivity (nearly 1 x 10-2 S cm-(1)) compared to other doping methods for poly{[N,N '-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5 '-(2,2 '-bithiophene)} (N2200). The findings highlight the robustness and efficiency of cation exchange doping as an effective approach for achieving high-quality n-type doping in conjugated polymers, thereby opening new avenues for the development of advanced polymer-based electronic devices. This study demonstrates a high-efficiency n-type doping method for organic semiconductors through cation exchange, achieving high doping levels while preserving the material's structural integrity, thereby leading to high electrical conductivity. The method holds great potential for improving the performance of organic electronic devices, including thermoelectric and solar cells. image

关键词： cation exchange conjugated polymer electrical conductivity n-type doping

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