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21st Wind and Solar Integration Workshop, WIW 2022

作者： Fujimoto, Yu Kato, Takuma Nohara, Daisuke Kanno, Yuki Ohba, Masamichi Hayashi, Yasuhiro Advanced Collaborative Research Organization for Smart Society Waseda University Tokyo Japan Department of Electrical Engineering and Bioscience Waseda University Tokyo Japan Sustainable System Research Laboratory Central Research Institute of Electric Power Industry Chiba Japan

ISBN: (纸本)9781839538544

Prediction of wind power output becomes further important to realize compensation for output fluctuation through operation of reserve power sources and energy storage systems. In particular, the probability density prediction (PDP), which derives a conditional probability distribution of the forthcoming wind power output based on the latest observable information, is attractive from the perspective of providing rich information not only on the expected value of power generation output but also on its uncertainty. This study discusses a density integration approach for the PDP task utilizing ensemble weather forecast (EWF) results derived with the individual ensemble members. The approach focuses on sequences of probability densities for the wind power plant (WPP) output derived by individual ensemble members;these sequences are dynamically weighted and integrated according to its current plausibility by matching them with the latest actual power generation at the required prediction timing. The framework enables us to realize frequently updatable short-term PDP by focusing on fresh observations, while taking advantage of ensemble weather forecasts, which are computationally expensive and not easily updated frequently. The usefulness of the proposed framework is evaluated through benchmark experiments on data sets collected at several real-world WPPs. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Wind power

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Corrosion Mechanisms and Differences of Inconel 617 and Incoloy 800h Under High-Temperature Air Ingress Accident

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SSRN 2024年

作者： Li, Haoxiang Yan, Dapeng Li, Guodong Tian, Changqing An, Jiayi Tan, Jiaqi Zheng, Wei Du, Bin Yin, Huaqiang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of China Chengdu China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing China Tsinghua University China

In the high-temperature operation of very high-temperature gas-cooled reactors (VHTRs), "microclimate reaction" are one of the key corrosion reactions of concern. This study investigates the corrosion behavior and mechanisms of the two mainstream high-temperature alloys, Incoloy 800H and Inconel 617, under minor air ingress accidents. The main focus is on comparing and analyzing the "microclimate reaction" corrosion behavior and mechanisms of the two alloys, as well as exploring changes in their mechanical properties. The results show that during the experiment, both alloys primarily underwent oxidation and "microclimate reaction". The double-layer oxide of Cr2 O3 -MnCr2 O4 /MnFe2 O4 and the SiO2 layer on the surface of Incoloy 800H provide good resistance to "microclimate reaction," whereas the single-layer Cr2 O3 oxide on Inconel 617 is not effective in preventing "microclimate reaction". The mechanical property test results indicate that the decarburization caused by "microclimate reaction" does not significantly affect the basic mechanical properties of the alloy. Research on "microclimate reactions" should primarily focus on preventing the oxidation layer from cracking and reducing the time during which the alloy matrix is unprotected by a protective oxide layer. © 2024, The Authors. All rights reserved.

关键词： Gas cooled reactors

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Editing the Shape Morphing of Monocomponent Natural Polysaccharide Hydrogel Films

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Research 2021年第1期2021卷 835-846页

作者： Hao Hu Chao Huang Massimiliano Galluzzi Qiang Ye Rui Xiao Xuefeng Yu Xuemin Du Institute of Biomedical&Health Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China Institute of Advanced Materials Science and Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Shape-morphing hydrogels can be widely used to develop artificial muscles,reconfigurable biodevices,and soft ***,conventional approaches for developing shape-morphing hydrogels highly rely on composite materials or complex manufacturing techniques,which limit their practical ***,we develop an unprecedented strategy to edit the shape morphing of monocomponent natural polysaccharide hydrogel films via integrating gradient cross-linking density and geometry *** to the synergistic effect,the shape morphing of chitosan(CS)hydrogel films with gradient cross-linking density can be facilely edited by changing their geometries(length-to-width ratios or thicknesses).Therefore,helix,short-side rolling,and longside rolling can be easily ***,various complex artificial 3D deformations such as artificial claw,horn,and flower can also be obtained by combining various flat CS hydrogel films with different geometries into one system,which can further demonstrate various shape transformations as triggered by *** work offers a simple strategy to construct a monocomponent hydrogel with geometry-directing programmable deformations,which provides universal insights into the design of shape-morphing polymers and will promote their applications in biodevices and soft robotics.

关键词： effect linking geometry

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Analysis of Flow Heat Transfer Characteristics of Helium-Xenon Gas Mixtures During Natural Circulation

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SSRN 2024年

作者： Wang, Xianbo Xie, Lin Bao, Hui Zhao, Fulong Tian, Youyou Liao, Haoyang Tian, Ruifeng Tan, Sichao Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin150001 China Nuclear Power Institute of China Sichuan Province Chengdu610000 China

Helium-xenon gas mixture is a commonly used cooling medium in fourth-generation advanced reactor systems. The thermal conductivity of a passive waste heat system is related to the safety and reliability of the reactor system. Therefore, it is crucial to explore the passive characteristics of the helium-xenon gas mixture. The passive waste heat removal characteristics of a helium-xenon gas mixture are influenced by the flow and heat transfer characteristics of the mixture. However, existing research on the flow and heat transfer characteristics of helium-xenon gas mixture mainly focuses on single tube bundles and plate bundles with fixed flow rates and high Reynolds numbers. However, the natural circulation flow velocity under the influence of gravity changes with heating power, and the Reynolds numbers are all less than 15,000. Lack of research on convective heat transfer characteristics of the helium-xenon gas mixture at low Re. Therefore, this article conducts a study on the flow and heat transfer characteristics of helium xenon under natural circulation conditions. A 1:1 three-dimensional model of the experimental system was constructed using the CFD numerical calculation method. By comparing the experimental values with the calculation results, it was found that the error was less than 10%. This proves that the modified SST k-ω turbulence model can be used to study the flow and heat transfer characteristics of the helium-xenon gas mixture in subsequent natural circulation states. On this basis, natural cycle numerical simulations of helium xenon mixtures with different mixing ratios were carried out at a heat flux of 5000 W/m2, as well as natural cycle numerical simulations of 40 g/mol helium-xenon gas mixture at different heating powers, in order to study the effects of heating power and helium xenon mixing ratio on the natural cycle heat transfer characteristics of the helium-xenon gas mixture. The existing helium-xenon gas mixture flow heat transfer equation

关键词： Helium

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Switching Control Method for Optimal State Feedback Controller of Nuclear Reactor power system

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Journal of Applied Mathematics and Physics 2023年第8期11卷 2480-2490页

作者： Airan Dang Bowen Tu Xiuchun Luan Heilongjiang Provincial Key Laboratory of Nuclear Power System and Equipment Harbin Engineering University Harbin China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin China

Due to the nonlinearity of the reactor power system, the load tracking situation is closely related to the initial steady-state power and the final steady-state power after the introduction of the state feedback controller. Therefore, when the initial power and the final stable power are determined, the particle swarm optimization algorithm is used to find the optimal controller parameters to minimize the load tracking error. Since there are many combinations of initial stable power and final stable power, it is not possible to find the optimal controller parameters for all combinations, so the neural network is used to take the final stable power and the initial stable power as input, and the optimal controller parameters as the output. This method obtains the optimal state feedback controller switching control method can achieve a very excellent load tracking effect in the case of continuous power change, in the power change time point, the response is fast, in the controller parameter switching time point, the actual power does not fluctuate due to the change of controller parameters. .

关键词： Optimal Status Feedback Particle Swarm Optimization Neural Networks Controller Switching Control Load Tracking

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Research on the Jet Active Control Mechanism of Gas-Liquid Separation in Helical-Axial Multiphase Pumps

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SSRN 2024年

作者： Qiang, Pan Han, Wei Li, Rennian School of Energy and Power Engineering Lanzhou University of Technology Gansu Province Lanzhou730050 China Key Laboratory of Advanced Pumps Valves and Fluid Control System The Ministry of Education Lanzhou University of Technology China

In the field of deep-water oil and gas extraction, the intermittent gas blocking phenomenon in helical-axial multiphase pumps leads to decreased pump performance and reliability, severely limiting their large-scale application and promotion in engineering projects. To address this challenge, this study is based on the principle of jet flow field control to flow separation, utilizing external energy for active intervention to suppress the separation phenomena and improve the hydraulic efficiency within the impeller flow channel. The research reveals that the jets achieved a reconstruction of the internal flow in the helical-axial gas-liquid mixed transport pumps. Using orthogonal experimental methods, a preliminary predictive analysis of the factors influencing the effectiveness of the jet system was conducted. The study explored the impact of jet parameters on enhancing the performance of helical-axial gas-liquid mixed transport pumps from the perspective of diminishing gas aggregation at the trailing edge of the rotor cascade and curtailing backflow conditions, and established a mathematical model for the head and efficiency of helical-axial multiphase pumps under jet active control. Research indicates that the jet velocity significantly impacts the efficiency enhancement of multiphase pumps, with an optimal jet speed coefficient, Cjet=10, identified. Beyond this speed, the benefits brought by increased jet velocity do not compensate for the costs of introducing high-speed jets, and instead, may lead to a reduction in the efficiency of the pump. Jet flow field control methods alleviate the suction side gas aggregation downstream of the jet holes and in the flow domain traversed by the jets, effectively reducing the aggregation of gas phases in the rear channel of the rotor and suppressing backflow near the trailing edge of the rotor cascade. Jet control measures strengthen the working capacity of the blade in the flow direction beyond 0.35 times the length of the s

关键词： Gases

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Recent advances in perovskite/organic integrated solar cells

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Rare Metals 2021年第10期40卷 2763-2777页

作者： Qiang Guo Chen-Yun Wang Tasawar Hayat Ahmed Alsaedi Jian-Xi Yao Zhan-Ao Tan Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China NAAM Research Group Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100090China

The integrated perovskite/organic solar cell(IPOSC) is widely concerned as an effective approach to broaden the spectrum of perovskite solar cell(PerSC) by utilizing near-infrared light of lower bandgap organic semiconductor. Compared to tandem solar cells, the IPOSCs eliminate the preparation of the intermediate layer and simplify the manufacturing process, but retain the advantages of wide light harvesting. Meanwhile, the IPOSCs can maintain the open-circuit voltage as high as PerSCs. This review summarizes the recent developments of perovskite materials and low-bandgap organic conjugated materials applied in solar cells. Then, the working mechanism of IPOSCs and the recent developments of IPOSCs based on low-bandgap donor and acceptor materials are highlighted. Besides, the study of charge dynamic in IPOSC is summarized. Finally, the potential of IPOSCs and approach to improve device performance are also envisaged.

关键词： Organic solar cell Perovskite solar cell Perovskite/organic integrated solar cell Conjugated molecules

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Probabilistic supply and demand balance control method based on electricity market mechanism considering N–1 criterion

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IEEJ Transactions on power and Energy 2021年第1期141卷 1-12页

作者： Koide, Akira Tsuji, Takao Tanaka, Kazuyuki Sugimoto, Hitoshi Advanced Power System Engineering Laboratory University of Toyama 3190 Gofuku Toyama930-8555 Japan Graduate School of Sience and Engineering Yokohama National University 72-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Engineering Research and Development Center Hokuriku Electric Power Company 2-54 Hisakata-cho Toyama930-0848 Japan

To solve energy and environmental issue, Variable Renewable Energy (VRE) has been greatly promoted and power flow in transmission system becomes more uncertain due to VRE output fluctuation. N–1 criterion has been applied to determine secure generation dispatch or clearing point in the market so far, however, more strict risk management will be needed in the near future with more VRE integration. In this paper, a new market mechanism is proposed to determine clearing point considering overloading probability in addition to N–1 criterion. Supposing the clearing point can be given as a solution of optimal power flow calculation, congestion management is available with adjusting upper and lower limits of thermal capacity of transmission lines in the formulation. The effectiveness of the proposed method was verified through numerical simulation using modified IEEE New England 39 bus system model with taking into account bidding curves of both suppliers and customers. © 2021 The Institute of Electrical Engineers of Japan.

关键词： power markets

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Time series clustering adaptive enhanced method for time-dependent reliability analysis and design optimization

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Computer Methods in Applied Mechanics and engineering 2025年 443卷

作者： Zhang, Dequan Zhao, Ying Yang, Meide Jiang, Chao Han, Xu Li, Qing State Key Laboratory of Intelligent Power Distribution Equipment and System School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney New South Wales Sydney2006 Australia

Adaptive Kriging model has gained growing attention for its effectiveness in reducing the computational costs in time-dependent reliability analysis (TRA). However, the existing methods struggle to identify critical sample regions, leverage parallel computational resources, and assess the value for sample trajectories, thus restricting improvement in accuracy and efficiency. To address the challenges, this study proposes a time series clustering adaptive enhanced method (TSCM). TSCM first employs the time series clustering technique to partition the sample region efficiently. A novel time-dependent Kriging occurrence learning function is then introduced to account for both the uncertainty of sample trajectories and its influence on the approximated limit state boundary. Subsequently, an adaptive sampling strategy is developed to select training samples in parallel, guided by an uncertainty-based assessment of sample regions. After that, a time-dependent error-based stopping criterion is introduced to determine the training stage and terminate the update process. Finally, TSCM is extended to time-dependent reliability-based design optimization problems. Several numerical examples and an engineering case study demonstrate the superior computational efficiency and accuracy of the proposed method. © 2025

关键词： Time-to-failure

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Comparative Study on Soot Reduction, Soot Nanostructure and Oxidation Reactivity of n-heptane/DMC and Isooctane/DMC Inverse Diffusion Flames

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Journal of Thermal Science 2020年第5期29卷 1269-1281页

作者： JIANG Bo PALADPOKKRONG Chutikarn LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016China

Dimethyl carbonate(DMC)is an environmentally oxygenated compound which can be used efficiently for soot *** paper compared the soot reduction,soot nanostructure and oxidation reactivity from inverse diffusion flames(IDFs)of the hydrocarbon fuels,namely n-heptane and isooctane doped with *** of DMC additions on soot reduction were *** addition is more effective for the soot reduction of n-heptane/DMC IDF than isooctane/DMC *** morphology and nanostructures of soot particles were investigated by Transmission Electron Microscopy(TEM)and High Resolution TEM(HRTEM),and the soot graphitization and oxidation reactivity were analyzed by X-ray Diflfraction(XRD)and Thermogravimetric Analyzer(TGA),*** results of HRTEM images showed that many larger aggregates were observed for the structures of soot particles from IDFs with DMC *** soot particles exhibited more liquid-like material,more amorphous,higher disorganized layers,and less graphitic than that of IDFs without DMC *** increasing of DMC blending rate,soot particles changed younger to have shorter fringe length,higher tortuosity,and greater fringe *** on the XRD and TGA results,the degree of the soot graphitization level decreased;the soot mass lost significantly faster,and the soot become more reactive.

关键词： inverse diffusion flame n-heptane/DMC isooctane/DMC soot reduction soot nanostructure oxidation reactivity

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