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SSRN 2024年

作者： Huang, Xiangsong Ma, Xun Guo, Limin Pan, Dapeng Gou, Wenhu College of Information and Communication Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin150001 China AVIC United Technology Center for Electromagnetic Spectrum Collaborative Detection and Intelligent Cognition Harbin Engineering University Harbin150001 China

The purpose of multitarget tracking (MTT) is to estimate the state of an unknown and time-varying number of targets in scenarios from noisy *** are many issues that need to be solved in MTT, such as discrimination between measurements from targets and clutters, data association, target states prediction, trajectory management and target states estimation, etc. In this paper, a modular MTT algorithm based on Transformer and oriented only to measurements is proposed. In contrast to traditional Bayesian theory-based MTT algorithms, the proposed algorithm learns parameters such as clutter rate, detection probability, and target motion model from measurements or historical trajectories of the targets during the training, and tracks targets without making assumptions about these parameters in the inference. Therefore, the proposed algorithm has a better adaptive capability compared to the Bayesian theory-based MTT algorithms. Simulation experiments show that the proposed algorithm has better performance than the MTT algorithms based on Bayesian theory in complex scenarios with low detection probability, high clutter rate and target maneuvering. © 2024, The Authors. All rights reserved.

关键词： Clutter (information theory)

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STABILITY ANALYSIS of GRID-CONNECTED CONVERTERS in LOW-VOLTAGE DISTRIBUTION NETWORK 10

STABILITY ANALYSIS of GRID-CONNECTED CONVERTERS in LOW-VOLTA...

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10th Renewable Power Generation Conference, RPG 2021

作者： Zhou, Yini Li, Tong Liang, Haiwei Zou, Xudong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid Zhejiang Electric Power Research Institute Hangzhou China

ISBN: (纸本)9781839536069

As more and more power electronic equipment is connected to the low-voltage distribution network, the stability of the equipment needs to arouse people's attention. With the development of renewable energy, grid-connected converter (GCC) is the most common power electronic equipment as the interface unit. Therefore, this article takes the three-phase LCL type GCC as the research object, and explores the factors that affect the three-phase LCL type GCC in the low-voltage distribution network. First, the dq impedance model of the three-phase GCC is established. Secondly, the factors that may affect the stability are analyzed by the impedance stability criterion. Finally, it is verified by simulation that the line parameters of the low-voltage distribution network have almost no effect on the stability of the three-phase LCL type GCC. But when the three-phase LCL type GCC increases the output power and the number of parallel three-phase GCCs increases, the stability will deteriorate. As a consequence, it is necessary to limit the output power and the number of parallel-connected converters in the distribution network. © The Institution of engineering and technology.

关键词： Stability criteria

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Temperature Optimization for Efficient Power-to-Hydrogen Water Electrolysis

Temperature Optimization for Efficient Power-to-Hydrogen Wat...

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Sustainable Power and Energy Conference (iSPEC)

作者： Ke Chen Kewei Hu Jie Yang Feng Chen Jiakun Fang State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes an optimization model for temperature of water electrolyzers in pursuit of maximum power-to-hydrogen efficiency. Unlike the traditional operating strategy which controls constant temperature, the model aims at obtaining optimal temperature according to the variation of supplied current. In order to realize the maximum efficiency, the temperature-dependent electrochemical model of the electrolyzer, as well as the thermal model of the heater, is established. The optimal temperature occurs where the electrochemical loss and the thermal loss meet the balance. From the simulation results, the proposed model can acquire optimal temperature based on the supplied current, which can be applied to the scene of fluctuating power supply, e.g. wind and solar power. The test results show that up to 15% efficiency improvement can be achieved with the proposed temperature control method, compared with the traditional constant temperature control.

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Exploring the Sodium Storage Behavior and Full Battery Performance of Na4mnal(PO4)3 Cathode with High Energy Density

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SSRN 2023年

作者： Wang, Wei Chen, Suo Wu, Chuce Hou, Jie Wang, Kangli Jiang, Kai State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

The electrochemical sodium storage properties of NASCON-related phosphate Na4MnAl(PO4)3 (NMAP) have been investigated over a rational calcination temperature range based on differential scanning calorimetry (DSC) analysis for the first time. The optimized NMAP cathode delivers a discharge capacity of 105.9 mA h g-1 at 0.1 C with two high discharge voltage plateaus of 3.56 V and 4.11 V vs. Na+/Na. The electrochemical sodium storage mechanism is studied by X-ray diffraction (XRD) combined with X-ray photoelectron spectroscopy (XPS) characterizations, which reveals that Na4MnAl(PO4)3 cathode undergoes single-phase reaction under 4.1 V and two-phase reaction within 4.1-4.3 V. The whole deintercalation process of Na+ companied by the successive changes of Mn2+ → Mn3+ → Mn4+, while the valence of Al3+ keeps unchanged. Full sodium storage battery is also successfully achieved with hard-carbon anode, which delivers a discharge capacity of 91.1 mAh g-1 with an average discharge voltage of 3.35 V. All these results proves Na4MnAl(PO4)3 to a low-cost and high energy density cathode materials for SIBs. © 2023, The Authors. All rights reserved.

关键词： Alumina

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Joint Optimal Planning of Electricity-gas-heat System Considering Refined Gas Network Modeling 4

Joint Optimal Planning of Electricity-gas-heat System Consid...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： He, Xianglu Lou, Suhua Liu, Jiangping Wu, Yaowu Zhang, Meng Wang, Yuan Bai, Congtao Huazhong University of Science and Technology Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Hubei Electric Power Company Power Exchange Center Wuhan China

ISBN: (纸本)9781728171494

With the continuous development and application of various energy couplings such as combined heat and power units(CHP), gas turbines, power-to-gas (P2G) and other devices, the coupling of various energy sources in production, transmission, distribution and consumption has also strengthened. Therefore, when doing comprehensive energy planning, the integration and coordination between different energy sources must be considered to achieve the optimal allocation of different kinds of resources. This paper makes process in system plan with taking into account P2G and CHP units. A integrated energy optimal planning model considering electricity-gas-heat coupling is established, and a genetic algorithm-based solving method and the calculation process are given. According to the analysis of IEEE-24 and the 20 node natural gas grid in Belgium , this paper verifies the validity of the model. © 2021 IEEE.

关键词： Genetic algorithms

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Strong coupling of an EIT-like metamaterial with photons in a photonic crystal cavity

Strong coupling of an EIT-like metamaterial with photons in ...

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International Conference on Infrared and Millimeter Waves

作者： Fanqi Meng Lei Cao Aristeidis Karalis Hantian Gu Mark D. Thomson Hartmut G. Roskos Goethe-Universität Frankfurt Physikalisches Institut Frankfurt am Main Germany State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge USA

We report strong coupling between a plasmonic dark mode of an EIT-like metamaterial (EIT: electromagnetically induced transparency) with the photons of a 1D photonic crystal cavity in the terahertz frequency range. The coupling between the dark mode and the cavity photons is mediated by a plasmonic bright mode, which is proven by the observation of a frequency splitting which depends on the strength of the inductive interaction between the plasmon bright and dark modes of the EIT metamaterial. In addition, since the plasmonic dark mode strongly couples with the cavity dark mode, we observed four polariton modes. The frequency splitting by interaction of the four modes (plasmonic bright and dark mode and the two eigenmodes of the photonic cavity) can be reproduced in the framework of a model of four coupled harmonic oscillators.

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A Practical Approach for Short-Circuit Current Calculation in IIDG-Integrated Distribution Grid 10

A Practical Approach for Short-Circuit Current Calculation i...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Gao, Yi Shi, Hengchu Wu, Shengyang Kong, Dezhi You, Hao Chen, Jing Xu, Shoudong Chen, Jinfu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China System Analysis Department Scientific Research Institute of Yunnan Power Grid Kunming China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

With an ever-increasing number of inverter interface distributed generations (IIDGs) plugged into the distribution grids, the short-circuit characteristics within the distribution network have dramatically changed. It is, therefore, necessary to perform certain verifications or recalibrations to existing relay settings. The existing short-circuit current calculation methods considering IIDG require iterative solutions, which are incompatible with the non-iterative algorithms embedded in traditional relay setting calculation software. This conflict can give rise to major difficulties in practical industrial applications. Besides, iterative methods may encounter the problem of slow convergence or even no convergence. To break down these barriers, this work proposes a novel approach based on IIDG's point of common coupling (PCC) voltage estimation to calculate IIDG-integrated short-circuit current within engineering permissible error range from the perspective of industrial application. The introduced method first constructs an IIDG equivalent model considering inverters' control strategy. To facilitate the IIDG model's embedment in relay setting calculation software meanwhile remaining its consistency with traditional synchronous machine's fault equivalent model, branches including IIDG are transformed into equivalent series connection form of constant voltage sources and impedances. The analytical expression of the impedance is also ascertained. Utilizing the equivalent model, a non-iterative short-circuit current calculation is conducted, demonstrating better performance in computation efficiency and convergence speed and its compatibility with existing methods in relay setting calculation software. Finally, a simulation is performed on the IEEE 33-bus system to illustrate the superiority of the proposed method. © 2022 IEEE.

关键词： Short circuit currents

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Multi-Week Continuous-Time Scheduling of Integrated Electricity and Natural Gas System Against Long-Lasting Stressful Weather

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SSRN 2024年

作者： Ai, Xiaomeng Zhou, Huang Zhou, Jun Zhou, Bo Cui, Shichang Fang, Jiakun Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Grid Corporation of China Beijing100031 China Department of Industrial and Operations Engineering University of Michigan Ann ArborMI48109 United States

Increasing climate events have aroused worldwide attention on carbon neutrality, which significantly promotes the development of renewables, yet unfortunately, the high share of renewables dramatically increases the difficulty for power systems in dealing with stressful weather. This paper proposes a novel multi-week continuous-time scheduling of integrated electricity and natural gas system against long-lasting stressful weather. The proposed method considers both multi-week energy sufficiency and continuous-time power balance to accommodate long-lasting stressful weather, in which linepack gas storage, accurately modeled in a continuous spatial-temporal manner, is coordinated with battery energy storage and common thermal units. Temporal decomposition for continuous-time optimization is developed to tractably solve the established problem, where solution space transformation is first used for reformulation and progressive hedging is then utilized to divide the scheduling horizon into multiple segments for efficient calculation. Case studies validate the effectiveness of the proposed method in dealing with long-lasting extreme weather. © 2024, The Authors. All rights reserved.

关键词： Continuous time systems

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A Novel FTU with Broadband Split-core Current Transformers and Voltage Sensors 3

A Novel FTU with Broadband Split-core Current Transformers a...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Yao, Guo Yuxuan, Chen Shaorong, Wang Yang, Lei School of Electrical and Electronic Engineering Hust Hubei 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 Electric Power Research Institute of State Grid Hubei Electric Power Co. LTD. Hubei Wuhan430077 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

This paper presents a novel FTU for the distribution automation system of distribution network with a large number of new energy distributed generations. In the view of circuit principles, this FTU includes four key parts: Analog to Digital Converter Unit (ADCU), Main control Unit (MCU), Wireless Communication Unit (WCU) and Power Supply Unit (PSU). In terms of physical structure, the proposed FTU is boxed into two boxes with an optical fiber communication link for data exchanging each other. In this FTU the functions of DPMU (Distribution Network Synchroniz-ed Phasor Measurement Unit) are equipped. Also the proposed FTU is designed as a set of device assorted with broadband split-core current transformers and Wien bridge circuit voltage sensors. The proposed FTU largely expands functions of traditional FTU, and effectively improves anti-interference ability against to electromagnetic interference. In this paper, the structure and working principle of the above devices are introduces in detail. © 2022 IEEE.

关键词： Electric power distribution

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A Through-Intact-Skull(TIS)chronic window technique for cortical structure and function observation in mice

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eLight 2022年第1期2卷 185-202页

作者： Dongyu Li Zhengwu Hu Hequn Zhang Qihang Yang Liang Zhu Yin Liu Tingting Yu Jingtan Zhu Jiamin Wu Jing He Peng Fei Wang Xi Jun Qian Dan Zhu Britton Chance Center for Biomedical Photonics‑MoE Key Laboratory for Biomedical Photonics Wuhan National Laboratory for Optoelectronics‑Advanced Biomedical Imaging FacilityHuazhong University of Science and TechnologyWuhan 430074HubeiChina Optics Valley Laboratory Hubei 430074China State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China Interdisciplinary Institute of Neuroscience and Technology Department of AnesthesiologyThe Second Affiliated HospitalSchool of MedicineZhejiang UniversityKaixuan Road 258thHangzhou 310020China Department of Automation Tsinghua UniversityBeijing 100084China School of Optical Electronic Information‑Wuhan National Laboratory for Optoelectronics‑Advanced Biomedical Imaging Facility Huazhong University of Science and TechnologyWuhan 430074HubeiChina

Modern optical imaging techniques provide powerful tools for observing cortical structure and functions at high *** skull windows have been established for different applications of cortical imaging,and each has its advantages and *** critical of the limitations,none of the current skull windows is suitable for observing the responses to some acute craniocerebral injuries on a large scale and at high ***,we developed a“Through-Intact-Skull(TIS)window”that enables the observation of an immune response on a bilateral cortical scale and at single-cell resolution after traumatic brain injury without affecting the pathological environment of the *** TIS window also has the advantages of craniotomy-freeness,centimeter-field of view,synaptic resolution,large imaging depth,long-term observation capability,and suitability for awake ***,the TIS window is a promising new approach for intravital cortical microscopy in basic research in neuroscience.

关键词： Skull optical clearing window Long-term neurovascular imaging Traumatic brain injury Awake animal

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