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Simulation and Lead-In Design of Wall Bushings in Artificial Climate Chamber Under Complex Atmospheric Conditions 1

10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Xia, Junyi Ma, Ziyu Xiong, Peiqi Shen, Nanxuan He, Xuyuan He, Kun Cheng, Li Bian, Xingming State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing102206 China Tibet Yangbajing High Altitude Electrical Safety and Electromagnetic Environment National Observation and Research Station Lhasa851500 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9789819934089

ISBN: (纸本)9789819934072

In order to explore the effects of atmospheric conditions on corona discharge under AC/DC composite voltage, it is proposed to build an artificial climate chamber that can simulate complex atmospheric conditions (0.5 ~ 1 atm, −30 ~ 80℃, 10 ~ 95% relative humidity) and lead in AC 100 kV (peak voltage) and DC ± 100 kV into the chamber with wall bushings. For the operation safety of the experiment under complex atmospheric conditions, the breakdown voltage is corrected, and the electric field intensity is controlled within corona control value. The finite element method is adopted to calculate the electric field distribution of three wall bushings with different installation positions. According to the simulation results, the best installation position is set to 0.6 m away from the upper wall. This paper provides a useful reference for the lead-in design of equipment insulation structure under complex atmospheric conditions. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Finite element method

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A Real-Time state Estimation Method with Dual Filter Framework Based on MEMS-SINS/GNSS system

A Real-Time State Estimation Method with Dual Filter Framewo...

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第43届中国控制会议

作者： Xin Xiong Yamin Huang Tao Lei State Key Laboratory of Maritime Technology and Safety Wuhan University of Technology Intelligent Transport System Research Center Wuhan University of Technology

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

High-precision navigation information of a remote-controlled ship(RC-ship) is vital for ensuring the safe and effective operation by shore-based ***,the complexity of the waterborne environment contributes to increased uncertainty in the system model,leading to inaccuracies in state filter ***,Due to the delay of communication between ship and shore,the accuracy of real time state estimation will be further *** this paper,A realtime state estimation method considering both navigation system error and time delay error is *** of all,an adaptive interactive multi-model(IMM) algorithm based on Cubature Kalman Filter(CKF) framework is proposed to address the issue of system noise uncertainty by matching the appropriate model within the model ***,the uncertainty of transmission delays is modeled using a probability density function(PDF),enabling this method to handle uncertain time ***,an augmented state method considering the uncertainty of communication delay is proposed to compensate the time delay *** validate the effectiveness of the proposed method,a series of real ship-borne experiments including different scenarios of communication delay were *** results show that this method can estimate the realtime state of the ship under different sailing scene with uncertain time delay.

关键词： real-time state estimation CKF RC-ship IMM

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An improved prediction method of subsequent commutation failure of an LCC-HVDC considering sequential control response

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Protection and Control of Modern Power systems 2023年第3期8卷 173-183页

作者： Jinxin Ouyang Xinyu Pan Junjun Ye Chao Xiao Yanbo Diao Qingwu Zhang State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China Electric Power Research Institute of State Grid Henan Electric Power Company Zhengzhou 450052China Chongqing City Management College Chongqing 401331China NR Electric Co. LtdNanjing 211100China

Subsequent commutation failure(SCF)can be easily generated during the first commutation failure(CF)recovery process in a line-commutated converter-based high voltage direct-current *** poses a significant threat to the safe and stable operation of power systems,and accurate prediction of CF is thus ***,SCF is affected by the operating characteristics of the main circuit and the coupling effects of sequential control response in the inverter *** are difficult to predict *** this paper,a new SCF prediction method considering the control response is proposed based on the physical principle of *** time sequence and switching conditions of the controllers at different stages of the first CF recovery process are described,and the corresponding equations of commutation voltage affected by different controllers are *** calculation method of the SCF threshold voltage is proposed,and the prediction method is *** show that the proposed method can predict SCF accurately and provide useful tools to suppress SCF.

关键词： Line-commutated converter based high-voltage direct-current(LCC-HVDC) Subsequent commutation failure(SCF) Converter station Prediction

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Scientific Advances and Weather Services of the China Meteorological Administration’s National Forecasting systems during the Beijing 2022 Winter Olympics

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Advances in Atmospheric Sciences 2024年第5期41卷 767-776页

作者： Guo DENG Xueshun SHEN Jun DU Jiandong GONG Hua TONG Liantang DENG Zhifang XU Jing CHEN Jian SUN Yong WANG Jiangkai HU Jianjie WANG Mingxuan CHEN Huiling YUAN Yutao ZHANG Hongqi LI Yuanzhe WANG Li GAO Li SHENG Da LI Li LI Hao WANG Ying ZHAO Yinglin LI Zhili LIU Wenhua GUO China Meteorological Administration Earth System Modeling and Prediction Centre Beijing 100081China State Key Laboratory of Severe Weather China Meteorological AdministrationBeijing 100081China Key Laboratory of Earth System Modeling and Prediction China Meteorological AdministrationBeijing 100081China National Meteorological Center China Meteorological AdministrationBeijing 100081China Environmental Modeling Center/NCEP/NWS/NOAA College ParkMD 20740USA Nanjing University of Information Science and Technology Nanjing 210044China Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China School of Atmospheric Sciences and Key Laboratory of Mesoscale Severe Weather/Ministry of Education Nanjing UniversityNanjing 210023China Tsinghua University Beijing 100084China

Since the Beijing 2022 Winter Olympics was the first Winter Olympics in history held in continental winter monsoon climate conditions across complex terrain areas,there is a deficiency of relevant research,operational techniques,and *** made providing meteorological services for this event particularly *** China Meteorological Administration(CMA)Earth system Modeling and Prediction Centre,achieved breakthroughs in research on short-and medium-term deterministic and ensemble numerical *** key technologies crucial for precise winter weather services during the Winter Olympics were developed.A comprehensive framework,known as the Operational system for High-Precision Weather Forecasting for the Winter Olympics,was *** of these advancements represent the highest level of capabilities currently available in *** meteorological service provided to the Beijing 2022 Games also exceeded previous Winter Olympic Games in both variety and *** included achievements such as the“100-meter level,minute level”downscaled spatiotemporal resolution and forecasts spanning 1 to 15 *** 30 new technologies and over 60 kinds of products that align with the requirements of the Winter Olympics Organizing Committee were developed,and many of these techniques have since been integrated into the CMA’s operational national forecasting *** accomplishments were facilitated by a dedicated weather forecasting and research initiative,in conjunction with the preexisting real-time operational forecasting systems of the *** program represents one of the five subprograms of the WMO’s high-impact weather forecasting demonstration project(SMART2022),and continues to play an important role in their Regional Association(RA)II Research Development Project(Hangzhou RDP).Therefore,the research accomplishments and meteorological service experiences from this program will be carried forward into forthcoming highimpact weather

关键词： Beijing Winter Olympic Games CMA national forecasting system data assimilation ensemble forecast bias correction and downscaling machine learning-based fusion methods

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Dissecting the contributions of organic nitrogen aerosols to global atmospheric nitrogen deposition and implications for ecosystems

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National Science Review 2023年第12期10卷 124-136页

作者： Yumin Li Tzung-May Fu Jian Zhen Yu Xu Yu Qi Chen Ruqian Miao Yang Zhou Aoxing Zhang Jianhuai Ye Xin Yang Shu Tao Hongbin Liu Weiqi Yao Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Provincial Observation and Research Station for Coastal Atmosphere and Climate of the Greater Bay Area Southern University of Science and Technology Division of Environment and Sustainability Hong Kong University of Science and Technology National Center for Applied Mathematics Shenzhen Department of Chemistry Hong Kong University of Science and Technology State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Laboratory for Regional Pollution Control College of Environmental Sciences and Engineering Peking University Frontier Science Center for Deep Ocean Multispheres and Earth System and Physical Oceanography Laboratory Ocean University of China College of Oceanic and Atmospheric Sciences Ocean University of China Department of Ocean Science Hong Kong University of Science and Technology Department of Ocean Science and Engineering Southern University of Science and Technology

Atmospheric deposition of particulate organic nitrogen（ONp） is a significant process in the global nitrogen cycle and may be pivotally important for N-limited ***,past models largely overlo oked the spatial and chemical inhomogeneity of atmospheric ONpand were thus deficient in assessing global *** constructed a comprehensive global model of atmospheric gaseous and particulate organic nitrogen（ON）,including the latest knowledge on emissions and secondary *** this model,we simulated global atmospheric ONpabundances consistent with *** estimated global atmospheric ON deposition was 26 Tg N yr-1,predominantly in the form of ONp(23 Tg N yr-1)and mostly from wildfires（37%）,oceans（22%） and aqueous productions（17%）.Globally,ONpcontributed as much as 40% to 80% of the total N deposition downwind of biomass-burning *** ONpdeposition thus constituted the dominant external N supply to the N-limited boreal forests,tundras and the Arctic Ocean,and its importance maybe amplified in a future warming climate.

关键词： organic nitrogen aerosol secondary organic nitrogen biomass burning

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An action plan for the agri-food sector at the time of the climate and biodiversity crises

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National Science Review 2023年第7期10卷 16-18页

作者： Francesco Cherubini Ting Hua Wenwu Zhao Industrial Ecology Programme Department of Energy and Process Engineering Norwegian University of Science and Technology (NTNU) State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical Science Beijing Normal University Institute of Land Surface System and Sustainable Development Faculty of Geographical Science Beijing Normal University

Land areas on our planet are facing unprecedented levels of *** than70%of the global ice-free land has been affected by human activities,30%of the land is threatened by degradation,biodiversity and other ecosystem services(ESs) are declining,and climate change is altering ecosystem functioning [1].Currently,agriculture is the dominant form of land use,with grazing land comprising27%and cropland 12%(and more than half of the cropland is used to produce animal feed).Agriculture is responsible for about one-third of global greenhouse gas(GHG) emissions [2] and it is the primary driver of deforestation,habitat destruction,global freshwater withdrawals,and global ocean and freshwater pollution [3].As land is a limited resource,

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Research on 220kV Spare Power Automatic Switching Equipment Standardized Application of Local functions Based on Real-Time Simulation∗ 5

Research on 220kV Spare Power Automatic Switching Equipment ...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Huang, Zhida Wu, Wencong Cai, Haiqing Zhu, Yihua Huang, Libin Chang, Dongxu State Key Laboratory of Hvdc Electric Power Research Institute Csg National Energy Power Grid Technology R&d Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Csg Key Laboratory for Power System Simulation Guangzhou China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Currently, the power grid is carrying out the standardized design and application of 220kV spare power automatic switching equipment. It is more difficult to carry out the on-site standby automatic switching function test in the actual power grid. The power supply department urgently needs a simulation environment that can truly simulate the actual power grid to support the development of this functional test. Real-time simulation has the ability to carry out on-site automatic transfer function tests in terms of technical feasibility. To verify its effectiveness, this paper built a standardized closed-loop test system for 220kV spare power automatic switching equipment based on real-time simulation. A number of tests have been carried out for the automatic switch-on function of on-site equipment, and the device action events on the actual site have been inverted. The test results show that the established RTDS real-time simulation model has the ability to simulate the actual 220kV power grid. It has been verified that the action logic of the standby automatic input device in various modes meets the requirements of the standard specification, which strongly supports the standardized application of the 220kV spare power automatic switching equipment function of the power grid. © 2022 IEEE.

关键词： Switching

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Real-Time Monitoring system for Rotor Temperature of a Large Turbogenerator Based on SmartMesh IP Wireless Network Communication technology

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China Communications 2022年第5期19卷 150-163页

作者： Zhiting Zhou Hui Li Yong Yang Haibo Zhang Zhennan Fan State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University) Shapingba DistrictChongqing 400044China Dongfang Electric Machinery Co. Ltd Research and Test Center Sichuan Deyang 618000China The Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China

In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network communication technology was designed and *** system is capable of providing comprehensive,accurate,continuous,and reliable real-time temperature monitoring for ***,it has demonstrated satisfactory results in a real-time monitoring test of the rotor temperature of various famous large-scale turbogenerators and giant nuclear power half-speed turbogenerators designed and manufactured in *** development and application of this wireless temperature measurement system would aid in improving the intelligent operation quality,safety,and stability of China’s large turbine generators and even the entire power system.

关键词： SmartMesh IP wireless network communication turbine generator rotor temperature realtime monitoring

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Virtual chain: A storage model supporting cross-blockchain transaction

Virtual chain: A storage model supporting cross-blockchain t...

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作者： Wang, Yan Yang, Bingqing Liu, Jingxin Zeng, Hui Xia, Changqing College of Information Liaoning University Shenyang China State key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Key Laboratory of Networked Control System Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang China

At present, blockchain is not only applied in the financial field, but also extended to the medical, insurance, internet of things, and many other fields. Its independence leads to more and more significant problems of network isolation. To address the problem of the cooperative operation between different blockchains, this article proposes virtual chain, a storage model supporting cross-blockchain transaction. It not only ensures that cross-chain transactions are tamper-proof and traceable but also realizes completely decentralized storage. First, to tackle the multidimensional heterogeneous problem existing in cross-chain trading, a data structure based on prefix tree is proposed to manage cross-chain trading data on top of source chain and target chain. Second, a signature verification mechanism based on elliptic curve is proposed to meet the operational atomicity requirements of both parties of cross-chain transaction. Third, the data fusion technology is used to expand the block capacity indirectly to achieve the high throughput of cross-chain transactions. Finally, by using the credibility-based access control and block chain technology to ensure the security of the data storage model, and conduct security analysis from three aspects of tamper-proof, data protection and anti-conspiracy node attack. The experiment shows that the proposed cross-chain transaction storage model can realize the efficient storage of the heterogeneous data, and satisfy the high requirement of the cross-chain transaction. Moreover, the virtual chain storage model establishes a safe and reliable working environment. © 2020 John Wiley & Sons Ltd.

关键词： Blockchain

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Research on Asymmetric Fault Location of Wind Farm Collection system Based on Compressed Sensing

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Energy Engineering 2023年第9期120卷 2029-2057页

作者： Huanan Yu Gang Han Hansong Luo He Wang Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China Qinhuangdao Power Supply Company State Grid Jibei Electric Power Co.Ltd.Qinhuangdao066099China

Aiming at the problem that most of the cables in the power collection systemof offshore wind farms are buried deep in the seabed,whichmakes it difficult to detect faults,this paper proposes a two-step fault location method based on compressed sensing and ranging *** first step is to determine the fault zone through compressed sensing,and improve the datameasurement,dictionary design and algorithmreconstruction:Firstly,the phase-locked loop trigonometric functionmethod is used to suppress the spike phenomenon when extracting the fault voltage,so that the extracted voltage valuewillnot have a large error due to the voltage ***,theλ-NIM dictionary is designed by using the node impedancematrix and the fault location coefficient to further reduce the influence of pseudo-fault ***,the CoSaMP algorithmis improved with the generalized Jaccard coefficient to improve the reconstruction *** second step is to use the ranging equation to accurately locate the asymmetric fault of the wind farm collection system on the basis of determining the fault *** simulation results show that the proposedmethod ismore accurate than the compressedsensingmethod andimpedancemethod in fault section location and fault location accuracy,the relative error is reduced from 0.75%to 0.4%,and has a certain anti-noise ability.

关键词： Offshore wind farm convergence system compression sensing ranging equation fault location

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