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Modeling and SOC estimation of lithium iron phosphate battery considering capacity loss

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Protection and Control of Modern Power Systems 2018年第1期3卷 61-69页

作者： Junhui Li Fengjie Gao Gangui Yan tianyang zhang Jianlin Li School of Electrical Engineering Northeast Electrical Power UniversityJilinChina Dongying Electric Power Supply Company State Grid Shandong Electric Power CompanyDongyingChina State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijingChina

Modeling and state of charge(SOC)estimation of Lithium cells are crucial techniques of the lithium battery management *** modeling is extremely complicated as the operating status of lithium battery is affected by temperature,current,cycle number,discharge depth and other *** paper studies the modeling of lithium iron phosphate battery based on the Thevenin’s equivalent circuit and a method to identify the open circuit voltage,resistance and capacitance in the model is *** improve the accuracy of the lithium battery model,a capacity estimation algorithm considering the capacity loss during the battery’s life *** addition,this paper solves the SOC estimation issue of the lithium battery caused by the uncertain noise using the extended Kalman filtering(EKF)algorithm.A simulation model of actual lithium batteries is designed in Matlab/Simulink and the simulation results verify the accuracy of the model under different operating modes.

关键词： Lithium-iron battery Battery model Capacity fading State of charge estimation

A High Spatiotemporal Iontronic Single-Cell Viscometer

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Research 2022年第4期2022卷 239-247页

作者： tianyang zhang Siyuan Yu Bing Wang Yitong Xu Xiaomei Shi Weiwei Zhao Dechen Jiang Hongyuan Chen Jingjuan Xu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

Ideal single-cell viscometer has remained unachieved,leaving a gap in current palette of single-cell *** of single-cell viscosity could contribute to our knowledge of fundamental biological processes,e.g.,mass diffusion,biochemical interaction,and cellular responses to many diseases and *** advances have been made to this end,existing methods generally suffer from limitations,e.g.,low spatiotemporal ***,we describe a high spatiotemporal iontronic single-cell viscometer that operates upon a patch clamp integrated with double-barreled nanopores separated by a septum of ca.32 *** system enables reversible electroosmotic manipulation of the adjacent small fluid bridging two nanopores,the viscous alternation of which could be sensitively monitored by the ionic *** practical cellular studies,significantly,our findings reveal not only the less deviated medium viscosities than those of lysosomes and mitochondria but also the highest viscosities in the near-nuclear region than those of mitochondrion-dense and lysosome-dense *** work has provided an accessible single-cell viscometer and enriched the armory of single-cell nanotools.

关键词： pores viscosity bridging

Highly crystalline core dominated the catalytic performance of carbon dot for cyclohexane to adipic acid reaction

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Nano Research 2022年第8期15卷 7662-7669页

作者： Xiao Wang Wenyi Bian tianyang zhang Yajie Zhao Mingwang Shao Haiping Lin Yang Liu Hui Huang Zhenhui Kang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering(MIMSE) MUST-SUDA Joint Research Center for Advanced Functional MaterialsMacao University of Science and TechnologyTaipa 999078MacaoChina School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

Carbon dots(CDs)have uniquely structural,physicochemical and photochemical properties,suggesting a promising platform for catalysis *** in-depth understanding of the structure-activity relationship in the CDs-based catalyst system needs to know the effect of the crystalline core on their catalytic *** efficient catalytic oxidation of cyclohexane is an urgent challenge in current chemical industry,in which,adipic acid(AA)plays an important role in industry for synthesis of nylon6 and ***,we fabricated the pristine CDs by electrochemical etching graphite rod method and derived CDs with high crystalline core(CD-600,CD-800,and CD-1100)through a thermal treatment method in tube ***,these CDs performed an outstanding catalytic performance for one-step synthesis of AA from *** the help of machine learning(ML),the deep correlations between features(structures of CDs,catalytic conditions)and catalytic performances were investigated by XGBoost(XGB)*** under the optimization and prediction of XGB,it was found that high crystalline core preceded the other features and CD-1100 could get the best conversion of 30.696%and selectivity to AA of 92.52%at reaction conditions of 130℃,1.5 MPa,and 10 *** work pioneered the application of ML in industrial issues and demonstrated a comprehensive understanding on CDs as catalyst to realize one-step synthesis of AA.

关键词： adipic acid carbon dots machine learning catalytic performances crystalline core

Optimization of shale gas fracturing parameters based on artificial intelligence algorithm

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Artificial Intelligence in Geosciences 2023年第1期4卷 95-110页

作者： Shihao Qian Zhenzhen Dong Qianqian Shi Wei Guo Xiaowei zhang Zhaoxia Liu Lingjun Wang Lei Wu tianyang zhang Weirong Li Xi’an Shiyou University Xi’an710065China Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

Resource-rich shale gas plays a pivotal role in new energy *** key to scientifically and efficiently developing shale gas fields is to clarify the main factors that affect the production of shale gas *** this paper,according to the shale gas reservoir characteristic of the Fuling marine Longmaxi Formation,a single-well geological model was established using the reservoir numerical simulation software ***,10,000 different reservoir models were randomly generated for different formation physical parameters,completion parameters,and fracturing parameters using the Monte Carlo method,and these 10,000 models were simulated *** machine learning model uses a dataset of 10,000 different geological,completion,and fracturing parameters as input and 10,000 production curves as *** machine learning regression methods were used to train and test the dataset,and the optimal method(GBDT algorithm)was selected,and the accuracy R2 of the test set of the GBDT prediction model is 0.96.A fracturing parameter optimization workflow was constructed by combining a production prediction model with a particle swarm optimizer(PSO).The process can quickly optimize the fracturing parameters and predict the production for each time by targeting the cumulative gas production under different geological *** optimized parameters are Fracture Spacing,Fracture Width,Intrinsic Permeability,Fracture Half-length,Langmuir Pressure,and Langmuir *** initial predicted cumulative gas production was 4.59×10^(8)m^(3),which was optimized to 4.90×10^(8) m^(3).The proposed PSO-GBDT proxy model can instantly predict the production of shale gas wells with considerable accuracy,reliability,and efficiency,which is a vital tool for optimizing fracture *** investigation provides a solid foundation for predicting the production of unconventional gas reservoirs and for parameter optimization.

关键词： Shale gas Parameter optimization Prediction GBDT PSO

Comparative study on breakdown characteristics of trigger gap and overvoltage gap in a gas pressurized closing switch

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Plasma Science and Technology 2019年第1期21卷 87-92页

作者： Rongxiao ZHAI Tao HUANG Peitian CONG Weixi LUO Zhiguo WANG tianyang zhang Jiahui YIN Skate Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology

Gas pressurized closing switches are one of the most important elements in FLTD-based systems. Improving the trigger performance of gas switches is useful for optimizing the output parameters and the reliability of the FLTD. In this paper, the breakdown characteristics of the trigger gap and the overvoltage gap are studied experimentally. The reasons for the different breakdown performance of the two gaps are also investigated. The results show that the breakdown delay of the trigger gap is more influenced by the trigger voltage, while the breakdown delay of the overvoltage gap is more influenced by the working coefficient and always higher than that of the trigger gap. The jitter of the trigger gap is more influenced by the trigger voltage and accounts more than 60% of the total switch jitter, while the jitter of the overvoltage gap is hardly changed with the trigger voltage as well as the working coefficient and maintains less than 1.4 ns. It is proved that the discharging product from the trigger gap can effectively reduce the breakdown delay and jitter of the overvoltage gap. Based on that, the effect and improvement of pre-ionization on the two gaps are also studied. It is concluded that the jitter of the trigger gap reduces obviously when the pre-ionization is added, while the pre-ionization almost has no effect on the jitter of the overvoltage gap. The jitter of the overvoltage gap is about two times higher than the trigger gap in the pre-ionizing switch.

关键词： gas switch breakdown characteristic pre-ionization trigger gap overvoltage gap

Research on evaluation of network discourse power:Taking the Twitter accounts of Chinese diplomats as an example

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Data Science and Informetrics 2023年第1期3卷 13-25页

作者： Rongying Zhao Xiaoyu Wang Ruru Chang tianyang zhang Research Center for Chinese Science Evaluation Wuhan UniversityWuhanChina School of Information Management Wuhan UniversityWuhanChina

[Purpose/Significance]Changes in network technology and the network environment have caused profound changes in the publication,dissemination,and influence of network *** main body of a network discourse demonstrates the characteristics of civilians,which can impact the discourse power status of national discourse *** on the evaluation of network discourse power is conducive to clarifying the determinants of network discourse power and of considerable importance to the enhancement of the network discourse power of national public opinion institutions and improvement of the network environment.[Method/Process]First,this study explores the connotation of network discourse power and analyzes its generation ***,this study establishes a network discourse power evaluation indicator system and evaluation model based on information metrology and evaluation ***,this study conducts empirical research using the Twitter accounts of Chinese diplomats as the research object.[Result/Conclusion]Results show that the evaluation of network discourse power is a comprehensive evaluation of the network leading power,network communication power,and network influence of the main body of a network ***,the findings reveal that Chinese diplomats have a certain amount of network discourse power in society and demonstrate a trend of continuous improvement.

关键词： Network discourse power Discourse power evaluation Network leading power Network communicationpower Networkinfluence

基于WAAS监测数据的精度和完好性参数解算

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空间科学学报 2019年第4期39卷 502-511页

作者：倪育德张天阳中国民航大学电子信息与自动化学院民用航空器适航审定技术重点实验室

美国联邦航空管理局(FAA)建设的广域增强系统(WAAS)通过对全球定位系统(GPS)所需导航性能(RNP)的全面增强,目前已能在WAAS服务区的绝大部分空域支持从航路到具有垂直引导满足航向信标性能(LPV)-200进近的RNP.本文给出了WAAS报文的解码过... 详细信息

美国联邦航空管理局(FAA)建设的广域增强系统(WAAS)通过对全球定位系统(GPS)所需导航性能(RNP)的全面增强,目前已能在WAAS服务区的绝大部分空域支持从航路到具有垂直引导满足航向信标性能(LPV)-200进近的RNP.本文给出了WAAS报文的解码过程,结合WAAS广播报文阐述了精度和完好性参数的解算处理过程.选取美国阿拉斯加州和美国本土34个WAAS监测站的实测数据,按该处理流程解算出精度和完好性参数.结果表明,所选监测站位置的精度和完好性解算结果与美国国家卫星测试台(NSTB)公布的统计数据基本吻合,验证了报文解码以及参数提取算法和流程的正确性.WAAS精度和完好性参数解算处理流程可为中国北斗星基增强系统(BDSBAS)建设提供借鉴和参考.

关键词：星基增强系统广域增强系统水平位置精度因子高程精度因子水平保护级垂直保护级

Model Identification of Typical Thermal Process in Thermal Power Plant Based on PSO-CS Fusion Algorithm

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Model Identification of Typical Thermal Process in Thermal P...

不同折板絮凝器对薄荷水提液的絮凝效果研究与比较

第30届中国控制与决策会议

作者： Congzhi Huang tianyang zhang Xuanju Dang Hui Jiang School of Control and Computer Engineering North China Electric Power University Colleges and Universities Key Laboratory of Intelligent Integrated Automation Guilin University of Electronic Technology

The model identification issue of typical thermal process in a thermal power plant is investigated in the paper. It is crucial to further develop the PID controller parameters tuning approach or designing various advanced control laws. A CS-PSO fusion identification algorithm is proposed to identify the optimal model of the thermal process based on the process input and output data. In the algorithm, the conventional particle swarm optimization algorithm is employed to identify the model parameters of the typical thermal process, where the cuckoo searching algorithm is used to optimize its velocity parameters, and thus the identification accuracy is improved. The effectiveness of the proposed approach is validated by the extensive simulation results about the ultra supercritical unit and the circulating fluidized bed thermoelectric unit.

关键词： Thermal Process Thermal Power Plant Transfer Function Model Identification PSO-CS Fusion Algorithm

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过程工程学报 2021年第6期21卷 695-703页

作者：冯颖张庆瑾张建伟张天阳沈阳化工大学机械与动力工程学院辽宁沈阳110142

为了优化折板絮凝器结构及提升折板絮凝器对中药液的絮凝效果,利用FLUENT软件对同波/对波折板絮凝器的内部流场进行了模拟,分析了两种折板絮凝器内的涡旋分布及涡量。以薄荷水提液为研究对象,壳聚糖为絮凝剂,采用不同折板絮凝器对薄荷... 详细信息

为了优化折板絮凝器结构及提升折板絮凝器对中药液的絮凝效果,利用FLUENT软件对同波/对波折板絮凝器的内部流场进行了模拟,分析了两种折板絮凝器内的涡旋分布及涡量。以薄荷水提液为研究对象,壳聚糖为絮凝剂,采用不同折板絮凝器对薄荷水提液进行絮凝处理,以薄荷水提液澄清层高度、絮体沉降速度、总黄酮保留率、絮凝率、药液吸光度及絮体形态为指标,考察了两种折板絮凝器在不同进液流速下对薄荷水提液的絮凝效果。结果表明,同波折板絮凝器流场内以单侧涡旋为主,对波折板絮凝器内在折板两侧均产生涡旋,相同进液流速下,同波折板絮凝器产生的涡量小于对波折板絮凝器。随进液流速增加,同波/对波折板絮凝器对薄荷水提液的絮凝效果均呈先升高后降低的趋势,同波折板絮凝器最佳进液流速为0.068 m/s,药液总黄酮保留率为91.2%,絮凝率为85.3%;对波折板絮凝器最佳进液流速为0.051 m/s,药液总黄酮保留率为91.8%,絮凝率为85.4%。

关键词：折板絮凝器 FLUENT 絮凝薄荷水提液壳聚糖