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Model predictive control of grid-connected PV power generation system considering optimal MPPT control of PV modules

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Protection and Control of Modern Power Systems 2021年第1期6卷 407-418页

作者： Yingying Zhao Aimin An yifan xu Qianqian Wang Minmin Wang College of Electrical and Information Engineering Lanzhou University of TechnologyLanzhou730050GansuChina Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou730050GansuChina National Demonstration Center for Experimental Electrical and Control Engineering Education Lanzhou University of TechnologyLanzhou730050GansuChina

Because of system constraints caused by the external environment and grid faults,the conventional maximum power point tracking(MPPT)and inverter control methods of a PV power generation system cannot achieve optimal power *** can also lead to misjudgments and poor dynamic *** address these issues,this paper proposes a new MPPT method of PV modules based on model predictive control(MPC)and a finite control set model predictive current control(FCS-MPCC)of an *** the identification model of PV arrays,the module-based MPC controller is designed,and maximum output power is achieved by coordinating the optimal combination of spectral wavelength and module *** FCS-MPCC algorithm is then designed to predict the inverter current under different voltage vectors,the optimal voltage vector is selected according to the optimal value function,and the corresponding optimal switching state is applied to power semiconductor devices of the *** MPPT performance of the MPC controller and the responses of the inverter under different constraints are verified,and the steady-state and dynamic control effects of the inverter using FCS-MPCC are compared with the traditional feedforward decoupling PI control in Matlab/*** results show that MPC has better tracking performance under constraints,and the system has faster and more accurate dynamic response and flexibility than conventional PI control.

关键词： Grid-connected PV power generation system Model predictive control Maximum power point tracking Inverter Optimal value function

Put Others Before Itself:A Multi-Leader One-Follower Anti-Jamming Stackelberg Game Against Tracking Jammer

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China Communications 2021年第11期18卷 168-181页

作者： Xiaobo Zhang Hai Wang yifan xu Zhibin Feng Yunpeng Zhang College of Communications Engineering Army Engineering University of PLANanjing 210007China

This paper mainly investigates the coordinated anti-jamming channel access problems in multiuser scenarios where there exists a tracking jammer who senses the spectrum and traces the channel with maximal receiving *** cope with the challenges brought by the tracking jammer,a multi-leader onefollower anti-jamming Stackelberg(MOAS)game is formulated,which is able to model the complex interactions between users and the tracking *** the proposed game,users act as leaders,chose their channel access strategies and transmit *** tracking jammer acts as the follower,whose objective is to find the optimal jamming strategy at each time ***,the existence of Stackelberg equilibriums(SEs)is proved,which means users reach Nash Equilibriums(NEs)for each jamming strategy while the jammer finds its best response jamming strategy for the current network access *** active attraction based anti-jamming channel access(3ACA)algorithm is designed to reach SEs,where jammed users keep their channel access strategies unchanged to create access chances for other *** enhance the fairness of the system,users will adjust their strategies and relearn after certain time slots to provide access chances for those users who sacrifice themselves to attract the tracking jammer.

关键词： coordinated anti-jamming channel access Stackelberg game tracking jammer active attraction

Construction of CoS_(2) nanoparticles embedded in well-structured carbon nanocubes for high-performance potassium-ion half/full batteries

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Science China Chemistry 2021年第8期64卷 1401-1409页

作者： yifan xu Jianlu Sun Yanan He Jianbo Li Jianzhi xu Yingying Sun Jiaying Liao Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing210023China

Metal sulfides have been widely investigated as promising electrode materials for potassium-ion batteries(PIBs)due to their high theoretical ***,the practical application of metal sulfides in PIBs is still hindered by their intrinsic shortcomings of low conductivity and severe volume changes during the potassiation/depotassiation ***,a simple template-based two-step annealing strategy is proposed to impregnate CoS_(2) nanoparticles in the well-structured carbon nanocubes(denoted CoS_(2)/CNCs)as an advanced anode material for *** ex-situ XRD measurements reveal the K+storage mechanism in CoS_(2)/*** from the unique structures,including abundant active interfacial sites,high electronic conductivity,and significantly alleviated volume variation,CoS_(2)/CNCs present a high specific capacity(537.3 mAh g^(−1) at 0.1 A g^(−1)),good cycling stability(322.4 mAh g^(−1) at 0.5 A g^(−1) after 300 cycles),and excellent rate capability(153.1 mAh g^(−1) at 5 A g^(−1)).Moreover,the obtained nanocomposite shows superior potassium storage properties in K-ion full cells when it is coupled with a KVPO4F cathode.

关键词： CoS_(2)nanoparticles carbon nanocubes potassium-ion batteries anode full cell

An Accelerated Simulation Assessment Approach for Mission Success Probability of Multi-State Phased Mission Systems

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An Accelerated Simulation Assessment Approach for Mission Su...

Coupling Co_(3)[Co(CN)_(6)]_(2) nanocubes with reduced graphene oxide for high-rate and long-cycle-life potassium storage

第32届中国控制与决策会议

作者： Yang Haojie Lv Jianwei xu yifan Department of Management Engineering and Equipment Economics Naval University of Engineering

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158563

The mission success probability assessment of multi-state phased mission systems（MS-PMS） under complex mission were studied.A general simulation framework of the system under complex mission based on discrete event simulation is *** Monte Carlo method is used to generate the sample of random events,and accelerated sampling methods such as forced transitions and failure biasing are added to improve the sampling efficiency of small probability events,and the sampling statistics are modified to ensure the unbiasedness of the *** the warship navigation mission as an example,it is found that the accelerated sampling method can effectively improve the sampling probability of small probability events in the mission regardless of the mission *** main reason for the failure of the mission can be found by this simulation method,which can provide a basis for improving the success probability of the mission.

关键词： Mission success probability Multi-state system Monte Carlo method Warship navigation mission

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Journal of Energy Chemistry 2021年第7期30卷 593-601页

作者： yifan xu Yichen Du Zuyue Yi Zhuangzhuang Zhang Chenling Lai Jiaying Liao Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina

As one of prussian blue analogues,Co_(3)[Co(CN)_(6)]_(2) has been explored as a promising anode material for potassium-ion batteries(PIBs) owing to its high potassium storage ***,Co_(3)[Co(CN)_(6)]_(2) possesses low electronic conductivity and its structure collapses easily during potassiation and depotassiation,resulting in poor rate performance and cyclic *** solve these problems,we develop a facile multi-step method to successfully combine uniformCo_(3)[Co(CN)_(6)]_(2) nanocubes with rGO by C-O-Co *** expected,these chemcial bonds shorten the distance betweenCo_(3)[Co(CN)_(6)]_(2) and rGO to the angstrom meter level,which significantly improve the electronic conductivity ofCo_(3)[Co(CN)_(6)]_(2).Besides,the complete encapsulation ofCo_(3)[Co(CN)_(6)]_(2) nanocubes by rGO endows the structure ofCo_(3)[Co(CN)_(6)]_(2) with high stability,thus withstanding repeated insertion/extraction of potassium-ions without visible morphological and structural *** from the abovementioned structural advantages,the CO3 [Co(CN)6]2/rGO nanocomposite exhibits a high reversible capacity of 400.8 mAh g^(-1) at a current density of 0.1 A g^(-1),an exceptional rate capability of 115.5 mAh g^(-1) at 5 A g^(-1), and an ultralong cycle life of 231.9 mAh g^(-1) at 0.1 A g^(-1) after 1000 ***,the effects of different amounts of rGO and different sizes ofCo_(3)[Co(CN)_(6)]_(2) nanocubes on the potassium storage performance are also *** work offers an ideal route to significantly enhance the electrochemical properties of prussian blue analogues.

关键词： Co_(3)[Co(CN)_(6)]_(2) Reduced graphene oxide Anode Potassium-ion batteries Energy storage

Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg-Zn-Gd-Ca-Mn alloys

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2208-2220页

作者： yifan Song Xihai Li Jinliang xu Kai Zhang Yaozong Mao Hong Yan Huiping Li Rongshi Chen School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou Institute of TechnologyBinzhou 256606China

The basal texture of traditional magnesium alloy AZ31 is easy to form and exhibits poor plasticity at room *** address these problems,a multi-micro-alloyed high-plasticity Mg-1.8Zn-0.8Gd-0.1Ca-0.2Mn(wt%)alloy was developed using the unique role of rare earth and Ca solute *** addition,the influence of the annealing process on the grain size,second phase,texture,and mechanical properties of the warm-rolled sheet at room temperature was analyzed with the goal of developing high-plasticity mag-nesium alloy sheets and obtaining optimal thermal-mechanical treatment *** results show that the annealing temperature has a significant effect on the microstructure and properties due to the low alloying content:there are small amounts of larger-sized block and long string phases along the rolling direction(RD),as well as several spherical and rodlike particle phases inside the *** increas-ing annealing temperature,the grain size decreases and then increases,and the morphology,number,and size of the second phase also change *** particle phase within the grains vanishes at 450℃,and the grain size increases *** the full recrystal-lization stage at 300-350℃,the optimum strength-plasticity comprehensive mechanical properties are presented,with yield strengths of 182.1 and 176.9 MPa,tensile strengths of 271.1 and 275.8 MPa in the RD and transverse direction(TD),and elongation values of 27.4%and 32.3%,***,there are still some larger-sized phases in the alloy that influence its mechanical properties,which offers room for improvement.

关键词： Mg-Zn-Gd-Ca-Mn alloy annealing treatment microstructure texture dynamic recrystallization mechanical properties

上海市嘉定区居民结直肠癌2次筛查的依从性分析

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上海预防医学 2024年第7期36卷 706-711页

作者：陈单王亚伟黄芳徐一凡向芳张一英王娜邵月琴复旦大学公共卫生学院上海200032 上海市嘉定区疾病预防控制中心上海201800

【目的】探索上海市嘉定区居民结直肠癌2次筛查依从性及相关因素,为嘉定区结直肠癌防控提供科学依据。【方法】依托嘉定区自然人群队列,根据研究对象2017—2019、2020—2022年筛查情况分为从不参加筛查和参加筛查,其中参加筛查又分为参... 详细信息

【目的】探索上海市嘉定区居民结直肠癌2次筛查依从性及相关因素,为嘉定区结直肠癌防控提供科学依据。【方法】依托嘉定区自然人群队列,根据研究对象2017—2019、2020—2022年筛查情况分为从不参加筛查和参加筛查,其中参加筛查又分为参加1轮筛查和重复筛查。应用SPSS 21.0软件分析各组的人口学特征,采用χ^(2)检验或Fisher精确概率法对性别、年龄、文化程度、婚姻状况、退休状况、医疗保险类型等因素进行单因素分析。选取P<0.05的因素纳入多因素分析,采用多因素logistic回归分析重复筛查依从性的相关因素。【结果】纳入研究对象8179人。其中男性3323人、占40.6%,女性4856人、占59.4%;平均年龄(61.26±6.06)岁;文化程度小学及以下者2652人(32.4%),中学4242人(51.9%),中学以上1285人(15.7%);大多数人为在婚状态,有7579人(92.7%)。4062人从未参加过筛查,4117人参加过筛查,其中1485人重复筛查、重复筛查率18.2%。多因素logistic回归分析结果显示相较于男性,女性重复筛查依从性较好(OR=1.31,95%CI:1.14~1.50);与50~54岁的人群相比,年龄55~59岁(OR=1.57,95%CI:1.19~2.08)、60~64岁(OR=2.77,95%CI:2.13~3.61)、65~69岁(OR=3.31,95%CI:2.51~4.36)人群重复筛查依从性更高;与职工医疗保险的居民相比,居民医疗保险人群的重复筛查依从性更差(OR=0.76,95%CI:0.66~0.87);与无肠息肉史的人群相比,有肠息肉史的人群更有可能进行重复筛查(OR=2.07,95%CI:1.50~2.87)。【结论】结直肠癌重复筛查依从性仍有待提高,不同特征人群的重复筛查依从性存在差异,识别社区结直肠癌筛查依从性不高的群体,有针对性地采取干预措施,有助于提高居民对结直肠癌筛查的持续依从性。

关键词：结直肠癌两次筛查相关因素 logistic回归分析

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Functionalization of small black phosphorus nanoparticles for targeted imaging and photothermal therapy of cancer

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Science Bulletin 2018年第14期63卷 917-924页

作者： Lijuan Deng yifan xu Caixia Sun Baofeng Yun Qiao Sun Chongjun Zhao Zhen Li Key Laboratory for Ultrafine Materials of Ministry of Education. Shanghai Key Laboratory of Advanced Polymeric Materials School of Material Science and Engineering East China University of Science and Technology Shanghai 200237 China Center for Molecular imaging and Nuclear Medicine State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences (PAD-X) Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions Soochow University Suzhou 215123 China College of Textile and Clothing Engineering Soochow University Suzhou 215123 China

Black phosphorus(BP) nanomaterials have attracted extensive attention due to their unique physical,chemical, and biological properties. In this study, small BP nanoparticles were synthesized and modified with dextran and poly(ethyleneimine) for functionalization with folic acid and cyanine 7. The functionalized BP nanoparticles exhibit excellent biocompatibility, stability, and near infrared optical properties for targeted imaging of tumors through photoacoustic imaging and near-infrared fluorescence *** also display high photothermal conversion efficiency for photothermal therapy of cancer. This work demonstrates the potential of functionalized small BP nanoparticles as an emerging nanotheranostic agent for the diagnosis and treatment of cancer.

关键词： Black phosphorus Functionalization Targeted imaging Photothermal therapy

Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

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Microsystems & Nanoengineering 2024年第1期10卷 301-311页

作者： Song Wang Chenying Wang yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue xu Qijing Lin Kai Yao Yuheng Wang Feng Han Yu Sun Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure ***,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing *** address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−*** periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection ***,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing *** proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health *** these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress