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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Han, Zhaoyang Zhao, Qianyu Wang, Shouxiang Dong, Yichao Mu, Hao Ministry of Education Nankai District Tianjin300072 China Tianjin Key Laboratory of Power System Simulation Control Nankai District Tianjin300072 China State Grid Tianjin Electric Power Company Hebei District Tianjin300000 China

ISBN: (纸本)9781713865629

The whole county photovoltaic (PV) development will have an impact on the voltage level of the distribution network due to high penetration of PVs. Firstly, the mechanism of distributed PV to raise voltage level is explored. Then, based on Monte Carlo simulation, the analysis method of the influence of PV configuration uncertainty on voltage is proposed. Finally, the back/forward power flow calculation is adopted, taking a 10kV 88-node feeder in Jiangsu as an example. The voltage level under the current condition, the voltage level after adding planned PV capacity and the maximum PV hosting capacity are calculated and analyzed, which provides reference for the promotion of whole-county-PV development in China. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Electric power distribution

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Dynamic Security Evaluation Method for Power systems Considering Cascading Failures 7

Dynamic Security Evaluation Method for Power Systems Conside...

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7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Liu, Ren Xu, Xingye Du, Wei Xiahou, Kaishun Zhu, Yihua Chang, Dongxu Guo, Hengdao Electric Power Research Institute of China Southern Power Grid Csg Key Laboratory For Power System Simulation Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China Electric Power Research Institute of China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Intelligent Operation and Control For New Energy Power System Guangdong Provincial Key Laboratory of China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350345094

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators. © 2023 IEEE.

关键词： Informatization

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Optimal Location and Capacity Planning of PV in AC/DC Distribution Network Based on Improved Particle Swarm Algorithm 2

Optimal Location and Capacity Planning of PV in AC/DC Distri...

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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Zhao, Qianyu Han, Zhaoyang Wang, Shouxiang Li, Qi Dong, Yichao Mu, Hao Ministry of Education Nankai District Tianjin300072 China Tianjin Key Laboratory of Power System Simulation Control Nankai District Tianjin300072 China State Grid Tianjin Electric Power Company Hebei District Tianjin300000 China

ISBN: (纸本)9781713865629

Distributed generations (DG) such as photovoltaics (PV), as renewable energy sources, can be continuously obtained from nature and have the characteristics of flexible integration and environmental friendliness. The location and capacity of PV is an important part of the planning and design of AC and DC distribution network, it is related to the distribution of AC and DC distribution network voltage, and affects the stability of the entire AC and DC distribution network voltage. In this paper, firstly, a PV location and capacity optimization model is built with the goal of minimizing the annual investment cost of PV and the expected value of network loss. Then, an Immune Chaos Hybrid Particle Swarm Optimization (ICHPSO) method is adopted to solve the planning of the PV system in AC and DC distribution network. Finally, the configuration optimization method is implemented and verified with test systems. The results show that the proposed planning method realizes the improvement effect of PV on the node voltage, and the optimization algorithm used has good convergence characteristics and the ability to quickly find the global optimization. Compared with the results of deterministic analysis, the annual investment cost when considering the uncertainty of the load source is smaller, and it can better reflect the actual situation, which verifies the rationality of the planning model proposed in this paper. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Global optimization

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A Review of Coupling and Interaction Studies of Grid-Forming Converters Based on Transient Stability

A Review of Coupling and Interaction Studies of Grid-Forming...

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Energy, Electrical and Power Engineering (CEEPE), International Conference on

作者： Zhen Tang Shuo Wang Yang Cui Xueting Cheng Yuting Zhao State Grid Shanxi Electric Power Research Institute Taiyuan China Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Northeast Electric Power University Jilin China

ISBN: (数字)9798350375794

ISBN: (纸本)9798350375800

Grid-forming (GFM) inverters, with their synchronous voltage source characteristics, have attracted widespread attention in recent years due to their ability to effectively enhance the stability of power-electronic-based new power systems. The document starts by examining the mechanism of system stability established by GFM and analyzes the issues that need to be addressed urgently after GFM is integrated into the system. Grid-forming control establishes multiple coupling channels with the grid connection point to provide voltage and frequency support. However, the frequency coupling also brings about many interaction issues. The document divides the coupling interaction issues into "internal coupling" and "external interaction" issues based on whether the control structure modification is considered, and evaluates the research path for them.

关键词： Couplings Reviews Resonant frequency Power system stability Stability analysis Resonance Transient analysis

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The impact of the atmospheric turbulence-development tendency on new particle formation: a common finding on three continents

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National Science Review 2021年第3期8卷 140-150页

作者： Hao Wu Zhanqing Li Hanqing Li Kun Luo Yuying Wang Peng Yan Fei Hu Fang Zhang Yele Sun Dongjie Shang Chunsheng Liang Dongmei Zhang Jing Wei Tong Wu Xiaoai Jin Xinxin Fan Maureen Cribb Marc L.Fischer Markku Kulmala Tuukka Pet?j? State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceBeijing Normal University ESSIC and Department of Atmospheric Science University of MarylandCollege Park State Key Laboratory of Clean Energy Utilization Zhejiang University School of Atmospheric Physics Nanjing University of Information Science and Technology Meteorological Observation Center China Meteorological Administration State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Lawrence Berkeley National Laboratory Institute for Atmospheric and Earth System Research/Physics Faculty of ScienceUniversity of Helsinki Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric Sciences Nanjing University

A new mechanism of new particle formation(NPF) is investigated using comprehensive measurements of aerosol physicochemical quantities and meteorological variables made in three continents,including Beijing,China;the Southern Great Plains site in the USA;and SMEAR Ⅱ Station in Hyytiala,Finland.D espite the considerably different emissions of chemical species among the sites,a common relationship was found between the characteristics of NPF and the stability *** stability parameter(ζ=Z/L,where Z is the height above ground and L is the Monin-Obukhov length) is found to play an important role;it drops significantly before NPF as the atmosphere becomes more unstable,which may serve as an indicator of nucleation *** the atmosphere becomes unstable,the NPF duration is closely related to the tendency for turbulence development,which influences the evolution of the condensation ***,the unstable atmosphere may dilute pre-existing particles,effectively reducing the condensation sink,especially at coarse mode to foster *** new mechanism is confirmed by model simulations using a molecular dynamic model that mimics the impact of turbulence development on nucleation by inducing and intensifying homogeneous nucleation events.

关键词： new particle formation turbulence development molecular dynamic

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Multi-objective Optimal Allocation Strategy for Distributed Energy Storage in Distribution Networks Adapted to High Penetration Distributed Photovoltaics 9

Multi-objective Optimal Allocation Strategy for Distributed ...

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

作者： Li, Cuiping Wang, Yanli Chen, Yiming Qi, Xuesong Liu, Yunjing Fang, Qian Cui, Shengyuan Wang, Yuming Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China State Grid Shanghai South Power Supply Company Science and Technology Section Shanghai China Jilin Power Supply Company Power Dispatching and Control Center Jilin China Jilin Power Supply Company Science and Technology Section Jilin China Jilin Power Supply Company Ministry of Science and Technology Jilin China

ISBN: (纸本)9798350309638

High percentage of photovoltaic gain connect to the wire line, so that the electricity grid from power distribution of the receiving end of the network into a set of production, storage, distribution of multi-source complex new network, the distribution network security operation and new energy consumption pressure increases. In response to the above, this paper puts forward the distributed ES multi-objective optimization configuration strategy of distribution network adapted to the high penetration rate distributed PV. And through a county power grid practical example to certify that the ES configuration approach proposed can effectively mitigate the impact of a high proportion of PV accessed, and it can reduce the abandonment of light. © 2024 IEEE.

关键词： Electric power distribution

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ACCELERATED PERFORMANCE DEGRADATION TEST AND ANALYSIS OF HIGH-TEMPERATURE STRAIN GAUGES 13

ACCELERATED PERFORMANCE DEGRADATION TEST AND ANALYSIS OF HIG...

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13th International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering, QR2MSE 2023

作者： Li, Lu Wang, Zhihua Yang, Ning Wu, Qiong Wang, Hanyue Mao, Zelong Ren, Kunpeng Wang, Qiuyue Wang, Yifeng National Key Laboratory of Strength and Structural Integrity School of Aeronautic Science and Engineering Beihang University Beijing China Shenyang Aircraft Design and Research Institute Shenyang China Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China Navigation Instrument Research Institute Tianjin China Beijing Institute of Control Engineering Beijing China

ISBN: (纸本)9781839539848

With the extension of the service time of the structure and the worse service temperature conditions, the drift problem of high-temperature strain gauges gradually becomes prominent. This research aims to address the issue of the drift of measurement results because of the performance degradation of high-temperature strain gauges, and investigate the drift law under different temperatures considering complex service environments. In this paper, a combination of experimental research and theoretical analysis is utilized to design and conduct the accelerated performance degradation test on high-temperature strain gauges. Based on the result of the test, an accelerated performance degradation model is developed using the Wiener process and Arrhenius model. Finally, estimation curves for the average value and percentile value of the performance parameters of the high-temperature strain gauges are obtained, which demonstrates that the established accelerated performance degradation model can reasonably describe the degradation law. Additionally, the established accelerated performance degradation model enables effective analysis and compensation of gauge drift at any temperature. © The Institution of Engineering & Technology 2023.

关键词： Strain gages

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Electromagnetic Transient Modeling and Real-time simulation Based on State-space Equations

Electromagnetic Transient Modeling and Real-time Simulation ...

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New Energy and Power Engineering (ICNEPE), International Conference on

作者： Tianyu Guo Binjiang Hu Hui Luo Liang Tu Yanjun Zhao YuFeng Hu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid China China Southern Power Grid Co. Ltd China

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

Due to the different output characteristics of different components of the power system, the simulation results of its output deviate from the actual situation. Therefore, the electromagnetic transient modeling and real-time simulation based on the state space equation are proposed. From the perspective of rectifier, DC transmission line, inverter and control system, the composition of the state space model of the complete power system and the output characteristics of each part in the operation process are analyzed. In the test results, the design method can achieve a stable fit between the real-time simulation results of voltage waveform containing two VSC modules and the actual situation.

关键词： simulation systems operation Power system dynamics Power system stability Aerospace electronics Mathematical models Real-time systems Smart grids Nonlinear dynamical systems Transient analysis

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Info-Hkelm Wind Power Short-Term Prediction Based on Wind Power Low Output Event Identification and Multi-Scenario Error Compensation

SSRN

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SSRN 2023年

作者： Yang, Mao Guo, Yunfeng Huang, Yutong Gu, Dake Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Province Jilin132012 China

The penetration of a high percentage of renewable energy poses a challenge to the safe and stable operation of the power system, frequent wind power low output events have seriously affected power dispatch and power supply reliability, it becomes necessary to anticipate the occurrence of wind power low output events in advance and to develop effective supply assurance measures. In this paper, we propose a method for identifying and accurately predicting wind power low output events, firstly, we define wind power low output events and identify low output event types based on CNN-BiGRU. Secondly, A weighted clustering comprehensive assessment indicator is proposed to evaluate the effect of clustering of low output events, hybrid kernel extreme learning machine based on weighted mean of vectors algorithm optimization (INFO-HKELM) is used for preliminary prediction of low output events in different scenarios, and a multi-scenario error compensation mechanism based on similar fragment matching is proposed for further correction of power prediction results. The proposed method was applied to a wind farm in Inner Mongolia Autonomous Region for validation. Compared with the rest of the methods, the NRMSE of the method in this paper decreases by 1.56%~1.7%, NMAE decreases by 0.6%~1.11%, and R2 increases by 2.50%~2.92%. The multi-scenario error compensation mechanism reduces the NRMSE and NMAE of the preliminary power prediction results by 1.3% and 1.4%, respectively, which further improves the prediction accuracy and proves the effectiveness of the proposed method in this paper. © 2023, The Authors. All rights reserved.

关键词： Wind power

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Projections of heat-related excess mortality in China due to climate change,population and aging

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Frontiers of Environmental Science & Engineering 2023年第11期17卷 145-155页

作者： Zhao Liu Si Gao Wenjia Cai Zongyi Li Can Wang Xing Chen Zhiyuan Ma Zijian Zhao School of Airport Economics and Management Beijing Institute of Economics and ManagementBeijing 100102China Department of Earth System Science Institute for Global Change StudiesMinistry of Education Ecological Field Station for East Asian Migratory BirdsTsinghua UniversityBeijing 100084China School of Land Science and Technology China University of Geosciences(Beijing)Beijing 100083China State Key Joint Laboratory of Environment Simulation and Pollution Control(SKLESPC) and School of EnvironmentTsinghua UniversityBeijing 100084China Global Energy Interconnection Development and Cooperation Organization(GEIDCO) Beijing 100052China

Climate change is one of the biggest health threats of the 21st *** China is the biggest developing country,with a large population and different climate types,its projections of large-scale heat-related excess mortality remain *** particular,the effects of climate change on aging populations have not been well studied,and may result in significantly underestimation of heat *** this study,we took four climate change scenarios of Tier-1 in CMIP6,which were combinations of Shared Socioeconomic Pathways(SSPs)and Representative Concentration Pathways(RCPs).We used the exposure-response functions derived from previous studies combined with baseline age-specific non-accidental mortality rates to project heat-related excess ***,we employed the Logarithmic Mean Divisia Index(LMDI)method to decompose the impacts of climate change,population growth,and aging on heat-related excess ***,we multiplied the heat-related Years of Life Lost(YLL)with the Value of a Statistical Life Year(VSLY)to quantify the economic burden of premature *** found that the heat-related excess mortality would be concentrated in central China and in the densely populated south-eastern coastal *** aging is considered,heat-related excess mortality will become 2.8–6.7 times than that without considering aging in 2081–2100 under different *** contribution analysis showed that the effect of aging on heat-related deaths would be much higher than that of climate *** findings highlighted that aging would lead to a severe increase of heat-related deaths and suggesting that regional-specific policies should be formulated in response to heat-related risks.

关键词： Heat-related excess mortality LMDI Aging YLL VSLY

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