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Heat Pumps in Denmark:Current Situation in Providing Frequency Control Ancillary Services

CSEE Journal of Power and Energy Systems 2022年第3期8卷 769-779页

作者： Menglin Zhang Qiuwei Wu Theis Bo Harild Rasmussen Xiaodong Yang Jinyu Wen Department of Electrical Engineering Centre for Electric Power and EnergyTechnical University of DenmarkKgs.LyngbyDenmark State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

-The Danish government set an ambitious goal to achieve a fully renewable-based energy system by *** this context,the integrated electricity and heating system is undergoing rapid development in Denmark as a promising way to accommodate the ever-growing renewable energy sources(RESs).The electric heat pumps(HPs),coupled with the power and heat sectors,can propagate the flexibility on the heat consumer side to the power system operations,playing an important role of improving system flexibility and balancing the variability of the *** this paper,the current development situation of HPs in Denmark is analyzed,including both the large-scale HPs in the district heating system and individual HPs on the residential *** possibility of using HPs to provide frequency control ancillary service(FCAS)is analyzed according to the market and technical requirements of the FCAS in the Danish transmission system and experimental results of representative demonstration projects of HPs.A comprehensive analysis of the advantages,barriers,future prospects,and challenges for using HPs to provide the FCAS are carried out from the perspectives of different entities.

关键词： Danish energy system frequency control ancillary service individual heat pumps integrated electricity and heat system large-scale heat pumps power to heat

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Design and development of a synchronized operation control system for Thomson scattering diagnostic on J-TEXT

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Plasma Science and technology 2018年第8期20卷 1-5页

作者： Jingjun ZHOU Li GAO Yinan ZHOU Jiefeng HUANG Ge ZHUANG International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic Engineering in Huazhong University of Science and TechnologyWuhan 430074People＇s Republic of China

A Thomson scattering diagnostic system is under construction at the Joint Texas Experimental Tokamak（J-TEXT）. A 1064 nm Nd：YAG laser with 50 Hz repetition rate is used as the laser source. We have used a software for careful and precise control of the laser through serial communication. A time sequence operating system has been developed to synchronize the laser control and data acquisition system with the central control system（CSS）. The system operates commands from the CSS of J-TEXT and generates triggers for the laser and data acquisition system in the proper sequence. It also measures an asynchronous time value that is needed for accurate time stamping. All functions are served by a field-programmable gate array development platform that is suitable for high-speed data and signal processing *** embedded peripherals, including Ethernet and USB 2.0, provide communication with the CSS and the server.

关键词： Thomson scattering diagnostic laser control synchronized operation

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Prediction of Equivalent Icing Thickness of Transmission Lines in Distribution Network 9

Prediction of Equivalent Icing Thickness of Transmission Lin...

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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Xu, Jiaxin Li, Dayi Dai, Yufeng Xie, Siqi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350309638

Aiming at the problem that the time series forecasting method will produce a certain degree of lag due to its series autocorrelation, the multivariate equivalent ice thickness prediction using meteorological data as the feature is used. Aiming at the problem that the prediction accuracy of ice thickness is not high, the attention mechanism is used to assign adaptive weights to multi-dimensional feature parameters and time steps to highlight important information in different feature dimensions and time steps. At the same time, due to the change of ice cover with time, a Bi-directional Long Short-term Memory (Bi-LSTM) is used to establish an ice cover prediction model to make use of the past and future information provided at each time point in the process, and for the parameter selection problem of Bi-LSTM, the sparrow search algorithm (SSA) is used to select the hyperparameters to reduce the error caused by human intervention, and then improve the accuracy of line equivalent ice thickness prediction, and finally verify the validity of the model through experimental results. © 2024 IEEE.

关键词： Long short-term memory

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Facile synthesis of Li2S@C composites as cathode for Li–S batteries

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Journal of Energy Chemistry 2019年第10期28卷 111-116页

作者： Xin Chen Linfeng Peng Lixia Yuan Rui Zeng Jingwei Xiang Weilun Chen Kai Yuan Jie Chen Yunhui Huang Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Lithium sulfide (Li2S) provides a promising route for lithium storage due to high theoretical specific capacity (1166 mAh g-1). The electrochemical performance of Li2S can be significantly enhanced by forming Li2S-carbon composites with the introduction of carbon. However, the complex synthesis method of Li2S-carbon composites restrains the large-scale productivity. Herein, we propose a facile route to prepare carbon coated Li2S-carbon nanotube composites (Li2S@C-CNT) via spray drying and heat treatment, which is a low-cost and large-scale method for facile synthesis of Li2S-carbon composites. For the Li2S@C-CNT composites, Li2S nanoparticles are contacted with surrounding particles due to the 3D CNTs framework. The novel construction not only suppresses the diffusion of polysulfides during cycling, but also remarkably accelerates the transport of electron and ion, resulting in a high specific capacity (1100 mAh g^-1) and good cycling performance. The rational designed architecture and good electrochemical performance of Li2S@C-CNT will pave the avenue for realizing high energy density of Li2S-based batteries.

关键词： Spray drying Li2S@C-CNT Lithium-sulfur batteries

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Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

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Plasma Science and technology 2021年第6期23卷 74-82页

作者： Hongyu DAI Lee LI Shuai REN Jingrun GUO Xin GONG Anthony Bruce MURPHY State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology(Ministry of Education)School of Electrical and Electronic EngineeringHuazhong University of Science&TechnologyWuhan 430074People's Republic of China CSIRO Manufacturing Lindfield NSW 2070Australia

As the widely implemented electrode material,graphite has the characteristic of sublimation by the thermal shock of the switching arc,and the produced carbon vapor is easy to condense into carbon powders and deposit in the *** impact of the type of dilution gas in a mixture of20%oxygen and 80%dilution gas on the sublimation and oxidation characteristics of the graphite electrode is *** is found that when nitrogen dilution gas was replaced by argon,the heat flux to the electrodes decreased,which led to a 63%reduction of graphite *** the same time,the cooling rate of the arc was slower in argon,which promotes oxidation of the carbon *** residual solid carbon can be reduced by 70%–85%by using argon as the dilution ***,it is demonstrated that the stability and working life of the switch could be increased by appropriate selection of the dilution gas.

关键词： pulsed discharge graphite electrode thermal arc dilution gas electrode erosion

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Voltage Distribution Characteristic of a Flux-Coupling Superconducting Fault Current Limiter in Different Operating Conditions

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IEEE Transactions on Applied Superconductivity 2017年第4期27卷 1-6页

作者： Yang, Zhangwei Li, Jingdong Yan, Sinian Zhang, Lihui Yu, Bing Ren, Li Liao, Yuxiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology R and D Center of Applied Superconductivity Huazhong University of Science and Technology Wuhan430074 China

The voltage distribution on the superconducting coils of a 400 V/20 A flux-coupling superconducting fault current limiter (FC-SFCL) is analyzed. The FC-SFCL, consisting of 16 superconducting coils, normally produces low impedance. When a fault occurs, a branch disconnects from the coupling circuit. Then the FC-SFCL produces high impedance and operates in the limiting condition. In different conditions, the voltage distribution on each coil is different and may be uneven. This will affect the structural design and quench detection of the FC-SFCL magnet. Thus, analyzing voltage distribution is necessary to ensure the reliability of the FC-SFCL. The methods of analysis are the finite element method and require further experimentation. The results of the simulation and experiment are in accordance with each other to some degree. © 2002-2011 IEEE.

关键词： Finite element method

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Transient stability risk assessment of power systems incorporating wind farms

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 134-141页

作者： Lu MIAO Jiakun FANG Jinyu WEN Weihua LUO State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Liaoning Electric Power Company Limited Shenyang 110006China

Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power *** paper focuses on the research of the transient stability of power systems incorporating with wind farms by utilizing risk assessment *** detailed model of double fed induction generator has been *** penetration variation and multiple stochastic factors of power systems have been *** process of transient stability risk assessment based on the Monte Carlo method has been described and a comprehensive risk indicator has been *** investigation has been conducted into an improved 10-generator 39-bus system with a wind farm incorporated to verify the validity and feasibility of the risk assessment method proposed.

关键词： Wind farm integration Transient stability DFIG Risk indicator Wind farm location

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Lithium Plating Accurate Detection of Lithium-Ion Capacitors Upon High-Rate Charging

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Green Energy and Intelligent Transportation 2025年

作者： Shasha Zhao Xianzhong Sun Yabin An Zhang Guo Chen Li Yanan Xu Yi Li Zhao Li Xiong Zhang Kai Wang Yanwei Ma Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of High Density Electromagnetic Power and Systems (Chinese Academy of Sciences) Haidian District Beijing 100190 China Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan 250013 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Department of Materials Engineering KU Leuven Leuven 3001 Belgium Department of Chemistry University of Liverpool Liverpool L69 7ZD United Kingdom

Lithium-ion capacitors (LICs) offer higher power density and longer cycle life compared to lithium-ion batteries, and greater energy density than supercapacitors, making them ideal for applications requiring both high energy and power density. However, during high-rate charging, LIC anodes may suffer from lithium plating, a critical issue that remains unaddressed. To date, no direct analytical technique exists to study lithium plating behavior on LIC anodes. This study is the first to employ a 3-electrode pouch-type LICs, using differential analysis of the anode potential rather than the traditional terminal voltage approach, to accurately detect the charging rates at which lithium plating begins. We employed differential charging voltage (DCV), Coulombic efficiency (CE), and voltage relaxation profile (VRP) methods to comprehensively analyze lithium plating behavior. The feasibility of indirectly detecting lithium plating was validated by applying the CE and VRP methods to high-capacity 1100 F LICs. The study found that lithium plating in LICs begins at a charging current of 20C. The lithium deposited at currents below 50C is reversible, while at currents above 50C, irreversible dead lithium is formed. Furthermore, the study identified two reverse reactions following lithium deposition on the anode: lithium stripping and lithium intercalation. For soft carbon anodes, the potential difference between lithium stripping and intercalation was approximately 20 mV under relaxation conditions, and about 45 mV under constant voltage conditions. This research provides critical theoretical insights and practical guidance for optimizing LIC charging strategies.

关键词： Lithium-ion capacitor lithium plating anode potential high-rate charging

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1,3,5-Trifluorobenzene endorsed EC-free electrolyte for high-voltage and wide-temperature lithium-ion batteries

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Journal of Energy Chemistry 2023年第10期85卷 49-57,I0003页

作者： Mingsheng Qin Ziqi Zeng Qiang Wu Xiaowei Liu Qijun Liu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Ethylene carbonate(EC)is susceptible to the aggressive chemistry of nickel-rich cathodes,making it undesirable for high-voltage lithium-ion batteries(LIBs).The arbitrary elimination of EC leads to better oxidative tolerance but always incurs interfacial degradation and electrolyte ***,an EC-free electrolyte is deliberately developed based on gradient solvation by pairing solvation-protection agent(1,3,5-trifluorobenzene,F_(3)B)with propylene carbonate(PC)/methyl ethyl carbonate(EMC)formulation.F_(3)B keeps out of inner coordination shell but decomposes preferentially to construct robust interphase,inhibiting solvent decomposition and electrode ***,the optimized electrolyte(1.1 M)with wide liquid range(-70–77℃)conveys decent interfacial compatibility and high-voltage stability(4.6 V for LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2),NCM622),qualifying reliable operation of practical NCM/graphite pouch cell(81.1%capacity retention over 600 cycles at 0.5 C).The solvation preservation and interface protection from F_(3)B blaze a new avenue for developing high-voltage electrolytes in next-generation LIBs.

关键词： Lithium-ion batteries Solvation structure High-voltage electrolyte Wide-temperature range Interfacial chemistry

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Observation of Hot Electrons in Surface-Wave Plasmas Excited by Surface Plasmon Polaritons

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Chinese Physics Letters 2011年第11期28卷 162-165页

作者： HU Ye-Lin CHEN Zhao-Quan LIU Ming-Hai HONG Ling-Li LI Ping ZHENG Xiao-Liang XIA Guang-Qing HU Xi-Wei College of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074 State Key Laboratory of Structure Analysis for Industrical Equipment Dalian University of TechnologyDalian 116024

The electron energy distribution functions(EEDFs)are studied in the planar-type surface-wave plasma(SWP)caused by resonant excitation of surface plasmon polaritons(SPPs)using a single cylindrical *** plasma characteristics can be considered as a bi-Maxwellian EEDF,which correspond to a superposition of the bulk low-temperature electron and the high-energy electron beam-like *** beam component energy is pronounced at about 10 eV but the bulk part is lower than 3.5 *** hot electrons included in the proposed plasmas play a significant role in plasma heating and further affect the discharge chemistry.

关键词： beam Electron resonant

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