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World Conference on Mechanical engineering and Intelligent Manufacturing (WCMEIM)

作者： Kaifeng HUANG Yong Wang Juqiang FENG a) Center of gas control b) Engineering Technology Research Center of Rail Transit Power and Control a) Center National Engineering Technology Research Institute of Coal Mining b) Huainan Normal University Huainan China Center of gas control Center National Engineering Technology Research Institute of Coal Mining Huainan China Engineering Technology Research Center of Rail Transit Power and Control Huainan Normal University Huainan China

ISBN: (纸本)9781665441094;9781665431125

For the optimal management of electric vehicle lithium-ion battery, it is of great significance to establish equivalent circuit model to study the charging and discharging behavior of the battery. In this paper, Rint, Thevenin, second order RC and PNGV models are analyzed, and their advantages and disadvantages are compared in the perspectives of model structure, physical meanings and differential equations. The parameters of the model are identified by HPPC experiment, and the simulation system is built by using Simulink. The results show that the four models can describe the dynamic changes of battery charging and discharging process. The PNGV model has higher accuracy and the average terminal voltage error is 0.0052v.

关键词： Lithium-ion batteries Analytical models Software packages Differential equations Electric vehicles Discharges (electric) Mathematical model

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Resilience Enhancement for Transmission Lines Under Decision-Dependent Uncertainty

Resilience Enhancement for Transmission Lines Under Decision...

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Chinese control Conference (CCC)

作者： Xinghua Liu Xiang Yang Yuzhen Sun Tianyang Zhao Peng Wang Department of Power Grid Information and Control Engineering Xi'an University of Technology Xi'an P. R. China State Grid Linshu County Power Supply Company of Shandong Province Linshu P. R. China Energy and Electric Research Center Jinan University Zhuhai P. R. China School of Electrical and Electronic Engineering Nanyang Technological University Singapore

Reinforcement of transmission lines before natural disasters such as typhoons is an effective measure to ensure that the power system can operate safely in face of extreme weather. To enhance the grid resilience, the uncertain problem is formulated as a two-stage robust optimization (TRO) problem for the resilient unit commitment. The exogenous uncertain polyhedral model does not address the coupling problem of typhoon hazard, reinforcement decision and transmission lines state, for which an decision-dependent uncertainty (DDU) set is constructed in this paper. Because the two-stage robust optimization problem based on decision-dependent uncertainty sets cannot be solved by the traditional column and constraint generation (C&CG) algorithm, a novel iterative algorithm based on the C&CG is invoked in this paper, in which advanced optimality cuts and feasibility cuts are designed to combine the uncertainty decision coupling. Lastly, the IEEE-5 bus test system is simulated under the influence of a typhoon to verify the effectiveness of the proposed method.

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An experimental study on heat transfer performance of a pulsating heat pipe radiator for CPU heat dissipation 2

An experimental study on heat transfer performance of a puls...

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2nd International Conference on Civil Architecture and Energy Science, CAES 2020

作者： Shang, Fumin Yang, Qingjing Liu, Chaoyue Fan, Shilong Liu, Jianhong Changchun Institute of Technology School of Energy and Power Engineering Changchun Jilin130012 China Jilin Province Building Energy Supply Indoor Environment Control Engineering Research Center Changchun130012 China

To meet the requirement of electronic heat dissipation with high heat flux, a kind of heat dissipation device using pulsating heat pipe (PHP) for CPU heat dissipation was put forward. The heat transfer performance and surface temperature distribution of the radiator are analyzed by analyzing the wall temperature distribution and the distribution of the evaporator and condenser of the PHP. The experimental results show that the change of wind speed has obvious influence on the operation of the PHP radiator. The surface temperature distribution of the PHP radiator is very uniform, which is especially beneficial for CPU cooling. The heat transfer performance of the PHP is better, and the minimum average thermal resistance is 0.19 k/W. In addition, there is no drying phenomenon when the temperature reaches about 120 °C, which indicates that the pulsating heat pipe has a very high heat transfer limit. © The Authors, published by EDP Sciences, 2020.

关键词： Temperature distribution

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Polarization Conversion and Beam Separation Based on All-Dielectric Metasurface

Polarization Conversion and Beam Separation Based on All-Die...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Cong Chen Xing Y Feng Hai Liu Xun Y Li Engineering Research Center of intelligent Control for Underground Space Ministry of education China University of Mining and Technology Xuzhou China School of Information and Control Engineering China University of Mining and Technology Xuzhou China School of Materials and Physics China University of Mining and Technology Xuzhou China State Grid Corporation of China Maintenance Branch of Benxi Power Supply Company Benxi China

An all-dielectric phase gradient metasurface is proposed, which consists of a periodic array of elliptical silicon nanopillars with a phase difference of $\pi$ on a quartz substrate. The polarization and transmission characteristics of the unit half-wave plate structure are comprehensively studied, and the simulation results show that its transmission efficiency in multiple communication frequency bands can reach 98%, and the polarization conversion efficiency can reach 90% $\sim$ 99%. Furthermore, we arrange the half-wave plates as a periodic integrated supercell array, which realizes the polarization conversion and spatial separation of the beams. he proposed all-dielectric metasurface offers a strategy for creating compact, integrated and high-performance plasmonic multifunctional devices.

关键词： Phased arrays Simulation Design methodology Metasurfaces Plasmons Frequency conversion Silicon

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Blockchain for Energy Market: A Comprehensive Survey

arXiv

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arXiv 2024年

作者： Jiang, Tianqi Luo, Haoxiang Yang, Kun Sun, Gang Yu, Hongfang Huang, Qi Vasilakos, Athanasios V. Glasgow College University of Electronic Science and Technology of China Chengdu611731 China Key Laboratory of Optical Fiber Sensing and Communications Ministry of Education University of Electronic Science and Technology of China Chengdu611731 China Guangyuan Power Supply Company State Grid Sichuan Electric Power Company Guangyuan628033 China Peng Cheng Laboratory Shenzhen518066 China Sichuan Provincial Key Laboratory of Power System Wide-Area Measurement and Control University of Electronic Science and Technology of China Chengdu611731 China School of Information Engineering Southwest University of Science and Technology Mianyang621010 China Center for AI Research University of Agder Grimstad4879 Norway

The energy market encompasses the behavior of energy supply and trading within a platform system. By utilizing centralized or distributed trading, energy can be effectively managed and distributed across different regions, thereby achieving market equilibrium and satisfying both producers and consumers. Additionally, the energy market can address future production control and environmental concerns such as energy shortages and environmental deterioration. However, recent years have presented unprecedented challenges and difficulties for the development of the energy market. These challenges include regional energy imbalances, volatile energy pricing, high computing costs, and issues related to transaction information disclosure. These factors have hindered the smooth operation of the energy market. researchers widely acknowledge that the security features of blockchain technology can enhance the efficiency of energy transactions and establish the fundamental stability and robustness of the energy market. This type of blockchain-enabled energy market is commonly referred to as an energy blockchain. Currently, there is a burgeoning amount of research in this field, encompassing algorithm design, framework construction, and practical application. It is crucial to organize and compare these research efforts to facilitate the further advancement of energy blockchain. This survey aims to comprehensively review the fundamental characteristics of blockchain and energy markets, highlighting the significant advantages of combining the two. Moreover, based on existing research outcomes, we will categorize and compare the current energy market research supported by blockchain in terms of algorithm design, market framework construction, and the policies and practical applications adopted by different countries. Finally, we will address current issues and propose potential future directions for improvement, to provide guidance for the practical implementation of blockchain in the

关键词： Deterioration

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Characteristics investigation on 4.5kV IGBT with partially narrow mesa and split-gate

Characteristics investigation on 4.5kV IGBT with partially n...

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作者： Xuebing Zhai Tong Yang Ruliang Zhang Jiang Du State Key Lab of Advanced Power Transmission Technology Global Energy Interconnection Research Institute CoLtd Electronic Engineering Department Xi'an University of Technology Electric Power Dispatching Control Center State Grid Jilinsheng Electric Power Supply Company

Low on-state voltage and low turn-off loss are key issues for IGBT used in HVDC and FACTS. Partial narrow mesa was introduced to improve emitter side contact resistance of IGBT based on Nakagawa limit assumption. However, turn-off loss increases and short circuit sustainability get worse. Split gate separates gate electrode from drift region and reduces gate-collector capacitance to lower turn-off energy loss. Combination partial narrow mesa with split gate can get better gate performance and turn-off characteristics in 4.5kV IGBT. Simulated results with TCAD show proposed models improves switching loss and gate reliability. By adjusting split gap electric filed, split gate shape has an important effect on turn-on characteristics.

关键词： Characteristics investigation on 4.5kV IGBT with partially narrow mesa and split-gate

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Study on temperature characteristics of mineral ferric phosph ate lithium-ion battery

Study on temperature characteristics of mineral ferric phosp...

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第二届制造技术，材料和化学工程国际学术会议（MTMCE 2019）

作者： Feng Juqiang Huang Kaifeng Wu Long Zhang Xing School of Mechanical and Electrical Engineering Huainan Normal University Research Center for Power Supply and Control Engineering Technology of Rail Transit

Lithium-ion battery(SE60 AHA type)is the main power of mine trolleybus. It studies the characteristics of main parameters such as capacity, charging and discharging time and cycle life with temperature, which can effectively ensure safety. This paper designs charging and discharging experiments under different temperature conditions and conducts OCV-SOC curve analysis. The results show that under the charging conditions of different temperature, there is no significant change in the relative capacity of charging, but the lower the temperature is, the shorter the constant-current charging time is and the longer the constant-voltage time is. Under the discharging condition of different temperature, the change of relative discharging capacity is obvious, the voltage drops faster when the temperature is lower than 0℃, and it keeps the same voltage variation when the temperature is higher than 0℃, while the discharging time reduces with decreased temperature. Further more, according to the variation of charging and discharging voltage with different temperature, it analyze the health status and optimal working environment of mine-type lithium-ion battery adopting the characteristics of charging and discharging efficiency. The research results provide a basis of the using and maintenance of large-capacity lithium-ion battery stack in special environments of the coal mining.

关键词： SOC cycle Study on temperature characteristics of mineral ferric phosph ate lithium-ion battery

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BNNG Algorithm Modeling for Vehicle Classification Recognition under Non Line-of-sight Environment

BNNG Algorithm Modeling for Vehicle Classification Recogniti...

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第四届能源与环境研究进展国际学术会议（ICAEER 2019）

作者： WU Long Huang Kaifeng Feng Juqiang School of Mechanical and Electrical Engineering Huainan Normal University Research Center for Power Supply and Control Engineering Technology of Rail Transit

At present, the automatic classification of vehicles on roads is mostly based on image recognition, and there are defects in adaptability under non-line-of-sight environments. In this paper, based on the similarity of the integration of the ecosystem model and multi-neural network model, an artificial neural network group(BNNG) algorithm was proposed. The vehicle's driving acoustic signal was taken as the research object, and it was calculated using the Artificial Neural Network(BNNG) algorithm to achieve automatic classification and recognition of vehicle models. Through experimental tests, it is shown that under non-line-of-sight environments, the accuracy of vehicle classification can be improved, and the misrecognition rate of similar models can be greatly reduced. This provided a new method for the automatic classification and identification of vehicles on roads, which was of great significance to monitor vehicle safety in non-line-of-sight environments.

关键词： image BNNG Algorithm Modeling for Vehicle Classification Recognition under Non Line-of-sight Environment

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Performance and Mechanism of a Transmembrane Electro-Chemisorption System with On-Site Utilization of Authigenic Acid and Base to Enhance Ammonia Recovery from Wastewater

SSRN

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SSRN 2024年

作者： Cao, Zhiyong Zhang, Jiao Deng, Ruifeng Wang, Zuobing Zhang, Zhiqiang Deng, Beiqi Zhang, Nan Zhang, Qingbo Wei, Guangfeng Liu, Xinchao Xia, Siqing State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources College of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China School of Municipal and Ecological Engineering Shanghai Urban Construction Vocational College Shanghai200432 China Huadian Electric Power Research Institute Co. Ltd Hangzhou310030 China National Engineering Research Center of Dredging Technology and Equipment 17 Shanghai200082 China Shanghai Key Laboratory of Chemical Assessment and Sustainability School of Chemical Science and Engineering Tongji University Shanghai200092 China Co. Ltd Shanghai200092 China

The electrochemical processes combined with transmembrane chemisorption (TMCS) represents a sustainable way for ammonia recovery from wastewater. However, poor utilization of acid and base produced by the combined systems has become a bottleneck for its development and application. In this study, a transmembrane electro-chemisorption (TMECS) system was developed via directly connecting anode chamber and cathode chamber with a hydrophobic gas permeable membrane (GPM). The special structure of "anode-GPM-cathode" was found to promote the TMCS of ammonia via the combined action of forming localized extreme pH layers at two sides of GPM, and electrical field forces between electrodes and NH4+. Increasing applied voltage and salt concentration could enhance ammonia recovery by promoting water splitting and reducing reactor internal resistance, respectively. The system showed wide applicability of the influent NH4+-N concentration (560-5000 mg/L). For a high influent NH4+-N concentration (5000 mg/L), a specific energy consumption of 21.8 kWh/kg N could be reached, which was lower than those of traditional ammonia recovery and total of production and removal of ammonia. Besides saving chemicals and producing hydrogen, the energy consumption is anticipated to be reduced sharply by stacking the TMECS units. Therefore, the system showed its good prospects in saving chemicals, wide applicability and scale-up potential for ammonia recovery from wastewater. © 2024, The Authors. All rights reserved.

关键词： Chemisorption

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Vulnerability analysis of cyber-physical system based on improved structural entropy 4

Vulnerability analysis of cyber-physical system based on imp...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Li, Long Li, Zhenwen Liu, Ying Xiao, Zhenfeng Cai, Ye Liu, Fang Hunan Electric Power Company Dispatch Control Center State Grid Corporation Changsha China Changsha University of Science and Technology School of Electrical and Information Engineering Changsha China Hunan Electric Power Company Limited Economic Technical Research Institute Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha China

ISBN: (纸本)9781728196060

With the continuous integration of the power grid and the information network, the vulnerability analysis of cyber-physical system considering the interaction between networks become more important. Based on the complex network theory, a topology model of power cyber-physical network is established, and improved structural entropy is proposed, which considering node differences, edge differences, and node dependency differences. Taking the Hunan Electric power Cyber-Physical System as an example, the simulation results show that the improved structural entropy can identify important nodes in the power grid. the dependent network is more vulnerable than a single network, nodes with high-degree and high-betweenness play a key role in maintaining the operation of the system, and the robustness of system will also be reduced when a few nodes with low-degree and low-betweenness fail. © 2020 IEEE.

关键词： Cyber Physical System

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