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SSRN 2024年

作者： Chen, Wenzhe Sun, Haishun Peng, Chaoyi Zhou, Huafeng Xu, Suyue State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Southern Power Grid Dispatching & Control Center Guangzhou China

More flexible ramping service is required due to the increase of renewable power generation in power systems. Electric vehicles (EVs) could provide such flexible ramping products (FRPs) at low cost while participating in the electricity market through aggregation. However, EVs’ dispatching capability cannot be fully utilized without the right incentives. This paper addresses a distributed optimal model developed between EV aggregators (EVAs) and the independent system operator (ISO). To make such concept, a cloud-edge collaborated market structure is adopted. At the edge level, EVAs assess the dispatching capability and solve the market bidding subproblem. At the cloud level, ISO solves the market clearing subproblem considering system’ economy and security. The overall problem is solved by the analytical target cascading (ATC) method. Heuristic constraints are also introduced into the model to improve convergence performance. The model is tested on a modified IEEE 30-bus system. Results demonstrate that the proposed method can incentivize EVAs with different owners to shift load and provide FRPs accurately, meanwhile reducing the cost and increasing the consumption of renewable energy effectively. © 2024, The Authors. All rights reserved.

关键词： Optimization

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Evolution characteristics of vacuum arc plasma under two types of electrode structures based on the principle of two-colorimetric diagnosis

Evolution characteristics of vacuum arc plasma under two typ...

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IEEE International Conference on Plasma Science (ICOPS)

作者： S. Liu Z. Yuan L. Liu P. Ya L. Chen Y. Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

The diffusion of vacuum arc directly affects the breaking ability of vacuum circuit breaker. The plasma distribution in the arc gap during initial diffusion is the main object to control the vacuum arc. The electrode structure is the main way to control the vacuum plasma by controlling the path of the current, so as to generate different magnetic fields to control the arc movement, development, distribution and extinction. Based on the principle of two-colorimetric diagnosis, the evolution characteristics of plasma under two types of electrode structures are experimentally studied. The 2D dynamic distributions of the plasma in the arcing with the cup-shaped axial magnetic field electrode and the $1 / 2$ turn coil electrode are obtained. The results show that the axial magnetic field intensity directly affects the distribution of cathode spots and plasma jets near the cathode. Compared with the cup-shaped axial magnetic field electrode, the luminance in arc gap presents a certain strip under the coil electrode condition, the overlap degree of the plasma jet decrease, the particle density is more uniform, and the attenuation rate along the radial direction is smaller, and is significantly reduced near the anode. The calculated results are in good agreement with the luminance distribution of spots and arc column.

关键词： Electrodes Coils Strips Plasma jets Circuit breakers Attenuation Plasmas

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Impact of Control Mode on Small-Signal Stability of Hybrid Cascaded UHVDC System 5

Impact of Control Mode on Small-Signal Stability of Hybrid C...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： He, Yongjie Xiang, Wang Wen, Jinyu Zhou, Jiapei Lin, Chang Zhao, Jingbo Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The hybrid cascaded UHVDC technology is especially suitable for large-capacity, long-distance and overhead line power transmission, and is one of the important technical approaches to solve the problem of large-scale renewable energy transmission over long distances. This paper establishes the small-signal model of the hybrid cascaded UHVDC system and validates the accuracy of the small-signal model by comparing the step responses obtained from the small-signal model with those from the detailed electromagnetic transient model. Based on the developed small-signal model, the impact of two different control modes of the system, the master-slave control mode and all constant DC voltage control mode, on the small-signal stability is investigated. © 2022 IEEE.

关键词： HVDC power transmission

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Excess Activity Tuned by Distorted Tetrahedron in CoMoO_(4) for Oxygen Evolution

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Energy & Environmental Materials 2024年第1期7卷 247-252页

作者： Hengbo Xiao Kai Chi Hongxia Yin Xiangji Zhou Pengxiang Lei Peizhi Liu Jiakun Fang Xiuhong Li Songliu Yuan Zhen Zhang Yaqiong Su Junjie Guo Lihua Qian School of Physics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Hubei University of TechnologyWuhan 430068China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry Xi'an Jiaotong UniversityXi'an 710049China

Oxygen vacancies enable modulating surface reconstruction of transition metal oxides containing metal-oxygen polyhedrons into metallic oxyhydroxide for oxygen evolution reaction(OER),while revealing reconstructing mechanism is stuck by the requirement to precisely control exact sites of these ***,oxygen vacancies are localized only within MoO_(4)tetrahedrons rather than CoO_(6)octahedrons in CoMoO_(4)catalyst,guaranteeing coherent reconstruction of CoO_(6)octahedrons into pure CoOOH with tunable activities for ***,distorted tetrahedron accelerates the dissolution of Mo atoms into alkaline electrolyte,triggering spontaneous transition of partial CoMoO_(4)into Co(OH)_(2).CoO_(6)octahedrons in both CoMoO_(4)and Co(OH)_(2)can transform pure CoOOH completely at lower potential,resulting in excess intrinsic activity whose summit is identified by overpotential at 10 mA cm^(-2)with 22.9%reduction and Tafel slope with 65.3%***-defined manipulation over the distorted polyhedrons offers one versatile knob to precisely modulate electronic structure of oxide catalysts with outstanding OER performance.

关键词： metal-oxygen polyhedron oxygen evolution reaction oxygen vacancy Raman spectroscopy

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Recent advances in transition metal chalcogenides for lithium-ion capacitors

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Rare Metals 2022年第9期41卷 2971-2984页

作者： Lei Wang Xiong Zhang Chen Li Xian-Zhong Sun Kai Wang Fang-Yuan Su Fang-Yan Liu Yan-Wei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan250013China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian116023China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Transition metal chalcogenides(TMCs)and TMCs-based nanocomposites have attracted extensive attention due to their versatile material species,low cost,and rich physical and chemical *** anode materials of lithium-ion capacitors(LICs),TMCs have exhibited high theoretical capacities and pseudocapacitance storage ***,there are many intrinsic challenges,such as low electrical conductivity,repeatedly high-volume changes and sluggish ionic diffusion ***,many traditional and unconventional techniques have been reported to solve these critical problems,and many innovative strategies are also used to prepare high quality anode materials for *** this mini review,a detailed family member list and comparison of TMCs in the field of lithium-ion capacitors have been summarized ***,many rectification stratagems and recent researches of TMCs have been exhibited and *** the end,as an outcome of these discussions,some further challenges and perspectives are envisioned to promote the application of TMCs materials for lithium-ion c apacitors.

关键词： Energy storage Transition metal chalcogenides(TMCs) Lithium-ion capacitors(LICs) Performance optimization

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Modeling of Electric Arc Furnace for Power Quality Analysis 3

Modeling of Electric Arc Furnace for Power Quality Analysis

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

作者： Xu, Ruiyang Ma, Shaoxiang Zhang, Ming School of Electrical and Electronic Engineering China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Electric arc furnace (EAF) is one of the typical nonlinear loads in distribution network, which causes power quality problems such as harmonics and voltage flicker. In this paper, a time-domain simulation of AC EAF model for the research of power quality is established in MATLAB/Simulink and a simple multi-step parameter estimation method is proposed for a given EAF load. Considering the specific structure of EAF transformer, the arc model is obtained by combination and modification of classical Cassie and Mayr equations. The arc model is dynamically modulated by superimposing the sinusoidal and band-limited white noise signal to simulate the actual working conditions. The comparison between results from simulation and data from real measurement shows that the proposed model is capable of describing the time-varying, nonlinear and unbalanced characteristics of EAF accurately, which provides a reference for the research of the low-voltage side of the EAF transformer power quality problems. © 2022 IEEE.

关键词： Power quality

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Development of the HCN heterodyne collective scattering system on J-TEXT

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Plasma Science and technology 2022年第6期24卷 72-76页

作者： Qinlin TAO Peng SHI Li GAO Lu WANG Zhongyong CHEN Zhonghe JIANG Yinan ZHOU Chengyu YANG Yuhan WANG Zhipeng CHEN Nengchao WANG Zhoujun YANG Yonghua DING Yuan PAN the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and Technology Wuhan 430074People's Republic of China United Kingdom Atomic Energy Authority Culham Centre for Fusion EnergyCulham Science CentreAbingdonOxon OX143DBUnited Kingdom Southwestern Institute of Physics Chengdu 610041People's Republic of China

A heterodyne collective scattering system has been designed and developed to investigate the turbulent transport of core plasma on J-TEXT.A dual-HCN laser which consists of two separately pumped HCN gas lasers at 337μm has been developed as the laser source of the scattering *** intermediate frequency(IF)is~1 MHz when there is a 4μm cavity length difference and capable to maintain stability more than 5 h without manual *** channels at three different angles(2≤k_(⊥)≤12 cm^(-1))have been installed with Schottky barrier diode mixers of 893 *** sampling frequency of the acquisition system is6 MHz to observe low-frequency density *** experimental results have been detected and more results can be expected in future experiments.

关键词： collective scattering dual-HCN laser density fluctuations

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Inertia Evaluation and Optimal Design for PMSG-Based Wind Turbines with df/dt Control

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2024年

作者： Hu, Bo Zhu, Donghai Hu, Jiabing Liu, Ruikuo Zou, Xudong Kang, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China China Three Gorges Corporation Science and Technology Research Institute Beijing100038 China

The df/dt control is widely used for permanent magnet synchronous generator (PMSG)-based wind turbines (WTs) to achieve inertial response. However, existing studies have only used df/dt control coefficients to characterize the inertia of WTs, which leads to inaccurate inertia evaluation and unsatisfactory design of control parameters. To deal with it, this paper presents an inertia evaluation and optimal design of PMSG-based WTs, by considering the multi-loop control dynamics. Firstly, the magnitude-phase motion model is established and the equivalent inertia in the form of a transfer function is derived. Then, the influence of multi-loop controllers and wind speed on equivalent inertia are explored, and the critical factors are revealed. Further, considering the inertia support requirements and the stable operation of the WTs, the inertia control parameters are optimally designed. Finally, the analysis and design are validated by experiments. © 2013 IEEE.

关键词： Permanent magnets

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Study on the Morphology Change of Acid-Resistant Core Rods of Composite Insulators Under Acid-Heat Condition 16th

Study on the Morphology Change of Acid-Resistant Core Rods o...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Peng, Junzhe Lu, Ming Zhang, Dandan Gao, Chao Pan, Wenwu Zhang, Yupeng Cai, Xiang Wan, Zhiyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Luoyu Road 1037 Wuhan China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Songshan South Road 85 Zhengzhou China

ISBN: (纸本)9789811918698

The nitric acid generated by partial discharge and the temperature rise caused by heat are the main deterioration factors of the composite insulator core rod during operation. This paper considers the influence of temperature changes in the degradation test of the nitric acid corroded core rod, and carries out the acid-heat degradation test of the acid-resistant core rod with different test temperature, nitric acid concentration, and deterioration time. And through macro analysis and micro analysis methods based on SEM and CLSM, comparative analyzing the morphological differences between the intact core rod, the acid etching core rod at room temperature, the acid-heat degraded core rod and the actual decay-like core rod. The macroscopic and microscopic morphology observation results show that the glass fiber of the acid-resistant core rod after acid etching at room temperature does not appear to be significantly broken. And the acid-resistant core rod after acid-heat deterioration has a serious deterioration process of glass fiber breakage and degradation of the epoxy resin matrix. It is proved that the temperature increase will accelerate the process of nitric acid corrosion of the core rod. The comparison of morphology shows that the acid-heat deterioration core rod and the actual decay-like core rod have more consistent characteristics in the macroscopic and microscopic morphologies. The acid-heat deterioration test method can better simulate the actual aging process of the core rod, and provide a direction for explaining the decay-like fracture mechanism of composite insulators. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nitric acid

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Robust Dispatch for Electrical-Thermal Combined Smart Building Considering Impacts of Uncertainties on Thermal Side

SSRN

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SSRN 2024年

作者： He, Weijie Wei, Fanrong Lin, Xiangning Dawoud, Samir M. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt

This paper presents a robust day-ahead dispatch for the smart building which is integrated with coupled electrical system and thermal system. From a building-level perspective, uncertainties such as stochastic solar radiation could not only impact the electrical side, but also the thermal side which is usually neglected in previous work. Therefore, we propose a comprehensive thermodynamic model to evaluate impacts of uncertain factors on the thermal system of the smart building in this paper. Subsequently, a robust co-optimization framework is formulated to cope with the uncertainties in a unified manner. To deal with the nonlinearity brought by the electrical-thermal coupled relationship, we propose a piecewise linearization method to convert the nonlinear robust co-optimization dispatch to a linear min-max-min problem, which can be solved by a traditional decomposition algorithm. Case studies demonstrate the necessity of considering the impacts of uncertain factors on the thermal side, as well as the advantages of co-optimizing framework for the smart building under the premise of ensuring the comfort of indoor temperatures. © 2024, The Authors. All rights reserved.

关键词： Buildings

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