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First stirling-type cryocooler reaching lambda point of ~4He(2.17K) and its prospect in Chinese HUBS satellite project

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Science Bulletin 2019年第4期64卷 219-221页

作者： Jue Wang Changzhao Pan Tong Zhang Kaiqi Luo Xiaotong Xi Xianlin Wu Jianpeng Zheng Liubiao Chen Junjie Wang Yuan Zhou Hai Jin Wei Cui University of Chinese Academy of Sciences CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Laboratoire National de Métrologie Et d'essais-Conservatoire National des Arts et Métiers (LNE-Cnam) State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Department of Physics and Center for Astrophysics Tsinghua University

The issue of "missing baryons” is always an unsolved mystery in galaxy cosmology, and an important reason for the great uncertainty of the galaxies' formation and evolution. To find the "missing" baryons, extra high-resolution spectral observation and imaging of the soft X-ray band (<1 kev) is required. However, the existing observation methods cannot meet this requirement. Therefore, Tsinghua University leads and proposes the Chinese "Hot Universe Baryon Surveyor (HUBS)" satellite program.

关键词： missing baryons HUBS missing

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Reliable Task Offloading for Vehicular Fog Computing under Information Asymmetry and Information Uncertainty

Reliable Task Offloading for Vehicular Fog Computing under I...

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作者： Zhou, Zhenyu Liao, Haijun Zhao, Xiongwen Ai, Bo Guizani, Mohsen State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China Department of Computer Science and Engineering Qatar University Doha Qatar

Vehicular fog computing has emerged as a cost-efficient solution for task processing in vehicular networks. However, how to realize effective server recruitment and reliable task offloading under information asymmetry and uncertainty remains a critical challenge. In this paper, we adopt a two-stage task offloading framework to address this challenge. First, we propose a convex-concave-procedure-based contract optimization algorithm for server recruitment, which aims to maximize the expected utility of the operator with asymmetric information. Then, a low-complexity and stable task offloading mechanism is proposed to minimize the total network delay based on the pricing-based matching. Furthermore, we extend the work to the scenario of information uncertainty and develop a matching-learning-based task offloading mechanism, which takes both occurrence awareness and conflict awareness into consideration. simulation results demonstrate that the proposed algorithm can effectively motivate resource sharing and guarantee bounded deviation from the optimal performance without the global information. © 2019 IEEE.

关键词： Fog computing

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Effect of long-term fluorination on surface electrical performance of ethylene propylene rubber

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High Voltage 2019年第4期4卷 339-344页

作者： Rujia Men Zhipeng Lei Tao Han Davide Fabiani Chuanyang Li Simone Vincenzo Suraci Jian Wang Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control College of Electrical and Power EngineeringTaiyuan University of TechnologyTaiyuan 030024People's Republic of China Department of Electrical Electronicand Information Engineering‘Guglielmo Marconi’University of BolognaViale Risorgimento 2Bologna 40136Italy Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChangping DistrictBeijing 102206People's Republic of China

To investigate the effect of fluorination on surface electrical performance of ethylene propylene rubber(EPR),four pieces of EPR specimens are prepared and fluorinated for different duration ranging from 120 min to 480 *** surface morphology and element compositions of experimental specimens are *** surface potential decay and complex permittivity are *** tracking discharge property and the erosion properties after tracking test are *** surface charge transport and electrical property tailoring mechanism are *** results show that when the fluorination duration is from 120 min to 360 min,the surface morphology gradually becomes flat and compact with time,and the surface resistance to electrical tracking is *** an excessive fluorination with the duration of 480 min leads to a significant increase in surface conductivity and a weakening in the resistance to electrical tracking,which is mainly due to a change in surface *** recommended fluorination duration for an optimised surface property is between 240 and 360 min for EPR specimen.

关键词： electrical propylene rubber

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Input data analysis for the thermal rating prediction of the overhead conductor

Input data analysis for the thermal rating prediction of the...

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2019 International Conference on Civil Engineering, Environment Resources and Energy Materials, CCESEM 2019

作者： Wenbo, Li Luhua, Xing Shanqiang, Fu Huadong, Li Zhe, Jiang Bo, Chen Electric Power Research Institute State Grid Shandong Electric Power Company Shandong Province Jinan250003 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China Jining Power Supply Company State Grid Shandong Electric Power Company Jining Shandong Province272100 China

The thermal rating of the overhead conductor is closely related to meteorological factors such as wind speed, wind direction, ambient temperature and solar radiation. Therefore, both the historical thermal ratings and meteorological data are alternative input data to predict the thermal rating of the overhead conductor. It is important to select suitable input data to improve the prediction accuracy of the prediction results. Based on the collection of micro-meteorological data from overhead line monitoring system, this paper presents a method to determine the input data for the thermal rating prediction by analysing the autocorrelation of overhead thermal ratings and the cross-correlation between thermal rating and historical micrometeorological data. The results show that the proposed method can provide reference information for the selection of predictive input quantities and prediction time domain. © Published under licence by IOP Publishing Ltd.

关键词： Input output programs

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Faulty line selection based on active-intervention-type arc suppression device via additional neutral resistance 8

Faulty line selection based on active-intervention-type arc ...

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8th Renewable power Generation Conference, RPG 2019

作者： Xu, Kai Wang, Peng Shi, Fang Bian, Chunyan Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China State Grid Henan Electric Power Company Electric Power Research Institute Zhengzhou China State Grid Shandong Electric Power Company Dezhou Branch Dezhou China

ISBN: (纸本)9781839531255

The excessive arc current will damage electric equipment and threaten personal security when the single-phase-to-ground fault occurs in the distribution network. The active-intervention-type arc suppression device can effectively suppress the arc current by actively switching on the grounding switch of the faulty phase at the bus. However, in case of mis-selection, a more severe two-phase fault will be triggered. This paper studies the procedures of the active-intervention-type arc suppression device and proposes a faulty line and faulty phase selection method based on the neutral point additional resistance. The real-time line-to-ground parameters are calculated using the neutral point voltage changes before and after the additional resistance switching, and then the change of the line-to-grounding parameter is analysed to determine the faulty phase. The zero-sequence components of each line are analysed, and a mathematical formula is presented to determine the faulty line as the switching of the additional resistor will change the zero-sequence circuit of the faulty line. simulation results show that the proposed method has high accuracy and reliability even for high-resistance-to-ground fault. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Electric grounding

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Coordinated Frequency control of Generation and Demand Side Considering Demand Side Resource Callback Characteristic

Coordinated Frequency Control of Generation and Demand Side ...

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IEEE International Conference on Automation, Electronics and Electrical Engineering (AUTEEE)

作者： Zhenxing Li Xin Shan Zhixian Wang Kun Yuan Ying Wang Kaifeng Zhang Key Laboratory of Measurement and Control of CSE Southeast University Nanjing China System R&D Center NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

The following topics are dealt with: learning (artificial intelligence); power engineering computing; feature extraction; power generation control; power grids; convolutional neural nets; natural language processing; ... 详细信息

ISBN: (数字)9781728198279

ISBN: (纸本)9781728181585

关键词： Frequency control Temperature Load modeling Time-frequency analysis Regulation Load shedding Temperature distribution

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Corrigendum to “Heterogeneous lattice hydrodynamic model and jamming transition mixed with connected vehicles and human-driven vehicles” [Physica A 623 (2023) 128903]

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Physica A: Statistical Mechanics and its Applications 2023年 626卷

作者： Cong Zhai Ronghui Zhang Tao Peng Changfu Zong Hongguo Xu Guangdong Key Laboratory of Intelligent Transportation System Sun Yat-sen University Guangdong 510275 China School of Transportation and Civil Engineering and Architecture Foshan University Foshan 528000 China College of Automobile and Transportation Tianjin University of Technology and Education Tianjin 300222 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130025 China College of Transportation Jilin University Changchun 130025 China

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Traveling waves based fault line selection using sparse representation

Traveling waves based fault line selection using sparse repr...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Wen Xu Shenxing Shi Xinzhou Dong Guangmei Zhang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Southern Power Grid Guizhou Liupanshui Power Supply Bureau Guizhou China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

Traveling wave method has been proved to be effective in fault line selection of power distribution system with the neutral non-effectively grounded. However, it can be easily disturbed by non-faulty traveling wave when selecting the line. For this reason, this paper proposes a new traveling wave line selection method based on sparse representation, in which current traveling wave signals are measured for the selection task. The algorithm of selection is based on the idea that all non-zero terms in the sparse coefficients of the measured signal are found to be associated with training samples from a single class, and the test samples can be easily assigned to the class. This makes it possible to distinguish between the non-faulty traveling wave and the real fault traveling wave.

关键词： Circuit faults Dictionaries Grounding Mathematical model Interference power distribution Integrated circuit modeling

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Assessment of Wind power Ramp Events Based on Stacked Denoising Autoencoder 8

Assessment of Wind Power Ramp Events Based on Stacked Denois...

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8th IEEE International Conference on Advanced power system Automation and Protection, APAP 2019

作者： Liang, Zhixiang Liu, Yutian Liu, Xiaoming Cao, Xiangyang Zhang, Liudong Wu, Haiwei Zhang, Qibing Yang, Ming Shandong University Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control Jinan250061 China Economic Technology Research Institute State Grid Shandong Electric Power Company Jinan250001 China State Grid Jiangsu Electric Power Company Nanjing210032 China

ISBN: (纸本)9781728117225

Wind power ramp events had a significant impact on the power balance of power system and may lead to load shedding. A data driven method was proposed for wind power ramp events assessment in this paper. The K-means clustering algorithm was used to divide the samples to several classes. The stacked denoising autoencoder was used to extract layer features to train support vector machine. Historical and forecast data of wind power, load power, conventional unit and pumped storage station power were taken as inputs. The output was whether ramp event occurred. A severity function was constructed to assess the severity grade which was predicted to be a wind power ramp event based on effect theory. The credibility of the assessment result was represented by confidence interval. simulation results of a provincial power grid showed that the prediction method in this paper was more accurate and credibility was high enough to help the dispatchers to take measures for the security of power grid. © 2019 IEEE.

关键词： Grading

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Reliability Assessment of Generation and Transmission systems Considering Multi-Form Access of "Source-Network-Load-Storage"

Reliability Assessment of Generation and Transmission System...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Qi, Ning Cheng, Lin Jiang, Yi Luo, Jinshan Sun, Ke Wang, Dan Cheng, Liang Wang, Quanquan Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Beijing China State Grid Economic and Technological Research Institute Co. Ltd. Beijing China State Grid Jiangsu Electric Power Co. LTD. China State Grid Jiangsu Economic Research Institute Jiangsu China

ISBN: (纸本)9781728149301

Reliability assessment is the key to ensure the security of power system, however, the rapid development of "source-network-load-storage" cause enormous obstacle to the traditional reliability method. A improved method for reliability assessment of generation and transmission systems is proposed in this paper which lays importance on the coordinate operation and uncertainty of "source-network-load-storage". Firstly, the reliability and operation model of "source-network-load- storage" is proposed to handle certain novel elements. Then the reliability assessment with operation simulation is proposed to make balance between generation and load under uncertainty. Finally, numerical analysis focusing on the different form and proportion of "source-network-load-storage" is tested in IEEE RTS-79 system so as to demonstrate the practicality and effectiveness of the improved method. © 2019 IEEE.

关键词： Renewable energy resources

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