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Improved Unit Commitment with Accurate Dynamic Scenarios Clustering Based on Multi-Parametric Programming and Benders Decomposition

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Energy Engineering 2024年第6期121卷 1557-1576页

作者： Zhang Zhi Haiyu huang Wei Xiong yijia Zhou Mingyu Yan Shaolian Xia Baofeng Jiang Renbin Su Xichen Tian State Grid Corporation of China Beijing100031China Central China Branch State Grid Corporation of ChinaWuhan430077China School of Electric and Electronic Engineering Huazhong University of Science and TechnologyWuhan430074China China Electric Power Research Institute Co. Ltd.Beijing100192China

Stochastic unit commitment is one of the most powerful methods to address uncertainty. However, the existingscenario clustering technique for stochastic unit commitment cannot accurately select representative scenarios,which threatens the robustness of stochastic unit commitment and hinders its application. This paper providesa stochastic unit commitment with dynamic scenario clustering based on multi-parametric programming andBenders decomposition. The stochastic unit commitment is solved via the Benders decomposition, which decouplesthe primal problem into the master problem and two types of subproblems. In the master problem, the committedgenerator is determined, while the feasibility and optimality of generator output are checked in these twosubproblems. Scenarios are dynamically clustered during the subproblem solution process through the multiparametric programming with respect to the solution of the master problem. In other words, multiple scenariosare clustered into several representative scenarios after the subproblem is solved, and the Benders cut obtainedby the representative scenario is generated for the master problem. Different from the conventional stochasticunit commitment, the proposed approach integrates scenario clustering into the Benders decomposition solutionprocess. Such a clustering approach could accurately cluster representative scenarios that have impacts on theunit commitment. The proposed method is tested on a 6-bus system and the modified IEEE 118-bus system.Numerical results illustrate the effectiveness of the proposed method in clustering scenarios. Compared withthe conventional clustering method, the proposed method can accurately select representative scenarios whilemitigating computational burden, thus guaranteeing the robustness of unit commitment.

关键词： Stochastic programming unit commitment scenarios clustering Benders decomposition multi-parametric programming

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A bi-functional strategy involving surface coating and subsurface gradient co-doping for enhanced cycle stability of LiCoO_(2) at 4.6 V

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Journal of Energy Chemistry 2023年第2期77卷 553-560,I0014页

作者： Yun He Xiaoliang Ding Tao Cheng Hongyu Cheng Meng Liu Zhijie Feng yijia huang Menghan Ge Yingchun Lyu Bingkun Guo Materials Genome Institute Shanghai UniversityShanghai 200444China

Layered LiCoO_(2)(LCO)acts as a dominant cathode material for lithium-ion batteries(LIBs)in 3C products because of its high compacted density and volumetric energy density.Although improving the high cutoff voltage is an effective strategy to increase its capacity,such behavior would trigger rapid capacity decay due to the surface or/and structure degradation.Herein,we propose a bi-functional surface strategy involving constructing a robust spinel-like phase coating layer with great integrity and compatibility to LiCoO_(2) and modulating crystal lattice by anion and cation gradient co-doping at the subsurface.As a result,the modified LiCoO_(2)(AFM-LCO)shows a capacity retention of 80.9%after 500 cycles between 3.0and 4.6 V.The Al,F,Mg enriched spinel-like phase coating layer serves as a robust physical barrier to effectively inhibit the undesired side reactions between the electrolyte and the cathode.Meanwhile,the Al,F,Mg gradient co-doping significantly enhances the surficial structure stability,suppresses Co dissolution and oxygen release,providing a stable path for Li-ions mobility all through the long-term cycles.Thus,the surface bi-functional strategy is an effective method to synergistically improve the electrochemical performances of LCO at a high cut-off voltage of 4.6 V.

关键词： Lithium-ion batteries 4.6 V-LiCoO_(2) Surface modification Gradient co-doping Interfacial stability

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Synergistic effect of fluorinated solvent and Mg^(2+)enabling 4.6 V LiCoO_(2)performances

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Chinese Chemical Letters 2023年第6期34卷 572-576页

作者： yijia huang Yidan Zhu Hongyu Cheng Meng Liu Yingying Song Xiaoliang Ding Kaiyun Xu Yinping Qin Yang Liu Bingkun Guo Materials Genome Institute Shanghai UniversityShanghai 200444China Tianmu Lake Institute of Advanced Energy Storage Technology Liyang 213300China

Increasing the charging cut-off potential of lithium cobalt oxide(LiCoO_(2),LCO)can effectively improve the energy density of the lithium-ion batteries,which are the mainstream energy storage devices used in 3C electronic products.However,the continuous decomposition of the electrolyte and dissolution of Co from the electrode will occur at high-potential operation,which deteriorate the performances of LCO.Here,a cathode-electrolyte interface(CEI)layer containing Mg F_(2)is constructed to enhance the electrochemical stability of LCO at 4.6 V(vs.Li^(+)/Li).The Mg^(2+)added to the cathode gradually releases into the electrolyte during cycling,which forms a stable Mg F_(2)-rich protective layer.In addition,1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether(TTE)is added to the electrolyte acting as a F source to increase the content of Mg F_(2)in the CEI layer.The Mg F_(2)-rich CEI layer effectively suppresses the decomposition of electrolyte components and the dissolution of Co of LCO,which makes the Li||LiCoO_(2)(Li||LCO)cell cycled stably at 3~4.6 V(vs.Li^(+)/Li)in 200 cycles with a retention of 83.9%.

关键词： 4.6 V LiCoO_(2) Fluorinated solvent Mg^(2+)additive Lithium metal

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螺旋波纹管流动特性试验研究

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低温与超导 2024年第2期52卷 40-47页

作者：黄华焦婷黄逸佳苏磊国网上海市电力公司上海200122 国网上海市电力公司电力科学研究院上海200437 上海国际超导科技有限公司上海200444

螺旋波纹管尺寸参数与流体在其内部的压损之间的关系尚未明确,针对超导电缆用的Φ40 mm以上的大尺寸波纹管也缺乏相应的试验数据。本文搭建了大尺寸波纹管流动特性试验平台,并参照已有的超导电缆结构,对标称外径分别为Φ90 mm和Φ60 mm... 详细信息

螺旋波纹管尺寸参数与流体在其内部的压损之间的关系尚未明确,针对超导电缆用的Φ40 mm以上的大尺寸波纹管也缺乏相应的试验数据。本文搭建了大尺寸波纹管流动特性试验平台,并参照已有的超导电缆结构,对标称外径分别为Φ90 mm和Φ60 mm、尺寸规格不同的四个空芯螺旋波纹管样品进行水介质的流动特性试验研究,从试验上得到了不同流量下的压损数据。结果表明,波纹管内压损随流速的增大呈接近于平方的关系增大。在流速相同情况下,外径规格相同的样品,波深越深,压损值越大;波深相同的样品,外径越小压损越大。利用上述试验数据,推导出每个样品摩擦系数f与雷诺数Re的关系式。关系式计算值与实验值最大偏差值为16.77%,可在一定误差范围内对摩擦系数f进行估算。

关键词：超导电缆螺旋波纹管流动特性压力损失

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Membrane dynamics of ATG4B and LC3 in autophagosome formation

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Journal of Molecular Cell Biology 2021年第12期13卷 853-863页

作者： Yuanyuan Zhou Zhenkun Wang yijia huang Chujie Bai Xianli Zhang Mengdie Fang Zhenyu Ju Bo Liu Key Laboratory of Regenerative Medicine of Ministry of Education Guangzhou Regenerative Medicine and Health Guangdong LaboratoryInstitute of Aging and Regenerative MedicineJinan UniversityGuangzhou 510632China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Bone and Soft Tissue TumorPeking University Cancer Hospital and InstituteBeijing 100142China College of Bioengineering Hangzhou Medical CollegeHangzhou 310013China

The biogenesis of autophagosomes provides the basis for macroautophagy to capture and degrade intracellular cargoes.Binding of the autophagy-related protein ATG8/LC3 to autophagic membranes is essential to autophagosome formation,which involves the specific and dynamic processing of ATG8/LC3 by cysteine protease ATG4.However,to date,the mechanism whereby ATG4 is recruited to the membranes,the interaction of ATG4 and ATG8/LC3 on the membranes,and its role in the growth of phagophore are not completely understood.Here,we used fluorescence recovery after photobleaching to monitor the turnover of GFP-tagged ATG4B and LC3B in living animal cells.The data show that ATG4B localizes to early autophagic membranes in an LC3B-dependent manner.During autophagy,ATG4B and LC3B undergo rapid cytosol/isolation membrane exchange but not at the cytosol/completed autophagosome.In addition,ATG4B activity controls the efficiency of autophagosome formation by impacting the membrane binding/dissociation of LC3B.These data suggest that ATG4 and LC3 play interdependent roles in the formation of autophagosomes.

关键词： autophagy autophagosome biogenesis ATG4 LC3 live-cell imaging membrane binding kinetics

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动态腕手矫形器结合改良强制性运动疗法对脑卒中偏瘫患者上肢和手功能障碍的效果

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中国康复理论与实践 2024年第5期30卷 606-612页

作者：黄崧华凌骏麒高天昊黄仪佳白玉龙复旦大学附属华山医院康复医学科上海市200040

目的观察动态腕手矫形器结合改良强制性运动疗法(mCIMT)对脑卒中偏瘫患者上肢及手功能的影响。方法2022年2月至2023年12月,复旦大学附属华山医院脑卒中恢复期患者32例,随机分为对照组(n=16)和试验组(n=16)。两组均接受常规康复训练,采... 详细信息

目的观察动态腕手矫形器结合改良强制性运动疗法(mCIMT)对脑卒中偏瘫患者上肢及手功能的影响。方法2022年2月至2023年12月,复旦大学附属华山医院脑卒中恢复期患者32例,随机分为对照组(n=16)和试验组(n=16)。两组均接受常规康复训练,采用改良强制性运动疗法,每天健侧上肢佩戴约束手套4 h;试验组同时患侧上肢佩戴动态腕手矫形器4 h;每周5 d,连续3周。分别于治疗前后采用Wolf运动功能量表(WMFT)、手臂动作调查测试(ARAT)和握力评估上肢运动功能,动作活动记录量表(MAL)评估动作使用量(AOU)和动作完成质量(QOM),汉密尔顿焦虑量表(HAMA)和汉密尔顿抑郁量表(HAMD)评估情绪变化,采用表面肌电图观察训练前后患/健侧腕背伸肌均方根值(RMS)比。结果治疗后,两组WMFT、ARAT、MAL-QOM、HAMA评分和患/健侧腕背伸肌RMS比均改善(|t|>2.179,P2.343,P2.819,P<0.05)。结论动态腕手矫形器结合mCIMT可以促进偏瘫患者上肢和手功能的恢复。

关键词：脑卒中改良强制性运动疗法腕手矫形器上肢手运动功能康复

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Generation of typical operation curves for hydrogen storage applied to the wind power fluctuation smoothing mode

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Global Energy Interconnection 2022年第4期5卷 353-361页

作者： Yanhui Xu yijia Xu Yan huang North China Electric Power University Beijing 102206P.R.China Energy Development Research Institute China Southern Power GridGuangzhou 510623P.R.China

In this paper,a typical-operation-curve generation method of a hydrogen energy storage system operating under the mode of stabilizing wind power fluctuations is proposed.This method is used to optimize the power and capacity configuration of the energy storage system.The time series curves of the charging and discharging powers of the hydrogen energy storage are obtained by EMD decomposition,and the curves are classified according to the similarities and differences of the characteristic parameters in different time periods.After the classification,typical charging and discharging power values of each type of curve at each moment are obtained by a cloud model,and then,typical operation curves of each type are obtained by integration.On this basis,the power and capacity of the energy storage system are optimized with the objective of economic optimization through the MATLAB CPLEX toolbox.Combined with the measured data of a wind farm with an installed capacity of 400 MW in Northeast China,the validity and rationality of the typical operation curve generation method proposed in this paper are verified.

关键词： Wind farm Hydrogen energy storage system Cluster analysis Typical operation curves Capacity configuration

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All-optical controlled-NOT logic gate achieving directional asymmetric transmission based on metasurface doublet

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光电进展(英文) 2023年第7期6卷 41-49页

作者： yijia huang Tianxiao Xiao Shuai Chen Zhengwei Xie Jie Zheng Jianqi Zhu Yarong Su Weidong Chen Ke Liu Mingjun Tang Peter Müller-Buschbaum Ling Li Laboratory of Micro-Nano Optics College of Physics and Electronic EngineeringSichuan Normal UniversityChengdu 610101China Physik-Department Lehrstuhl für Funktionelle MaterialienTechnische Universität MünchenJames-Franck-Straße 185748GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenLichtenbergstraße.185748GarchingGermany Tianjin Huahuixin Technology Group Co. LtdZhongtian AvenueTianjin 300467China

Optical logic gates play important roles in all-optical logic circuits,which lie at the heart of the next-generation optical computing technology.However,the intrinsic contradiction between compactness and robustness hinders the development in this field.Here,we propose a simple design principle that can possess multiple-input-output states according to the incident circular polarization and direction based on the metasurface doublet,which enables controlled-NOT logic gates in infrared region.Therefore,the directional asymmetric electromagnetic transmission can be achieved.As a proof of concept,a spin-dependent Janus metasurface is designed and experimentally verified that four distinct images corresponding to four input states can be captured in the far-field.In addition,since the design method is derived from geometric optics,it can be easily applied to other spectra.We believe that the proposed metasurface doublet may empower many potential applications in chiral imaging,chiroptical spectroscopy and optical computing.

关键词： metasurface polarization control asymmetric transmission logic gate

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基于路由交换技术的主站调度自动化系统设计与实现

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通信电源技术 2024年第11期41卷 71-73页

作者：陈忆瑜黄一甲国网浙江省电力有限公司杭州供电公司浙江杭州310016 国网杭州市钱塘区供电公司浙江杭州310000

在当前高度自动化和智能化的背景下,路由交换技术成为自动化设计领域的重要组成部分。路由交换技术作为一种先进的网络通信技术,具有高效、灵活、可靠的特点,能够有效实现设备之间的通信和数据交换。文章通过概述路由交换技术,提出一种... 详细信息

在当前高度自动化和智能化的背景下,路由交换技术成为自动化设计领域的重要组成部分。路由交换技术作为一种先进的网络通信技术,具有高效、灵活、可靠的特点,能够有效实现设备之间的通信和数据交换。文章通过概述路由交换技术,提出一种基于路由交换技术的主站调度自动化系统设计方案,重点分析系统架构与功能模块、数据采集与处理算法、人工智能技术在调度决策中的应用以及系统安全与可靠性设计等内容。

关键词：路由交换技术主站调度自动化系统设计方案

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深圳市一次强化减排措施下的VOCs组成和来源特征

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环境科学学报 2024年第1期44卷 124-134页

作者：陈冰娜程鹏梁永贤黄冠聪颜敏黄伟超廖艺佳陈钰彬李小兵袁斌暨南大学质谱仪器与大气环境研究所广州510632 广东省大气污染在线源解析系统工程技术研究中心广州510632 环境质量协同创新粤港澳联合实验室广州511443 深圳市环境科学研究院深圳518001 暨南大学环境与气候研究院广州511443

挥发性有机物(VOCs)是大气对流层中非常重要的痕量组分,对大气的氧化能力和区域环境问题都有重要影响.在当前我国颗粒物污染得到有效控制,而臭氧污染日趋突出的背景下,开展VOCs监测和研究具有很强的现实意义.本研究于2022年秋季在深圳... 详细信息

挥发性有机物(VOCs)是大气对流层中非常重要的痕量组分,对大气的氧化能力和区域环境问题都有重要影响.在当前我国颗粒物污染得到有效控制,而臭氧污染日趋突出的背景下,开展VOCs监测和研究具有很强的现实意义.本研究于2022年秋季在深圳市坪山区采用气相色谱-质谱/氢火焰离子化检测器(GC-MS/FID)对VOCs进行了近一个月的连续监测,在观测前半段,深圳市实施了大气污染强化减排措施,而在非减排期出现了一周的持续降水.对此,本研究主要针对强化减排期和非减排期(无降水),以及降水条件下VOCs污染特征和变化规律进行了分析,并采用PMF模型对不同时期的VOCs来源进行了比较.主要结论如下:观测期间VOCs总浓度均值为(31.85±26.07)×10^(-9),强化减排期浓度略高于非减排期(无降水).强化减排期以OVOCs组分贡献最大(30.21%),非减排期(无降水)以烷烃组分贡献最大(44.90%).强化减排期间高浓度物种大多具有更低的VOC/CO排放比,甲基环戊烷、2,2-二甲基丁烷、2,3-二甲基戊烷、环己烷、2-己酮的削减最为明显,但大部分物种在非减排期(无降水)的排放比更低.而在降水期间VOCs浓度出现反弹,主要以甲基环戊烷、2,2-二甲基丁烷、2,3-二甲基戊烷、环己烷、2-己酮为主.源解析结果表明,机动车尾气(27.70%)、餐厨废气+燃烧(20.44%)、油气挥发(19.76%)、溶剂使用(16.52%)、工业过程(12.91%)和植物源(2.67%)为该站点VOCs的主要来源.强化减排期间机动车尾气的削减效果最为显著,溶剂使用和油气挥发也有一定减少,体现了减排措施的有效性.但工业过程的浓度在强化减排期更高,说明减排措施对这一类排放源缺乏效果.此外,受降水过程影响,植物源的贡献较小,而餐厨废气+燃烧在两个时期的变化不大.总体上,深圳市强化减排措施对不同VOCs物种和来源的削减体现出选择性的特点.但受限于天气条件、区域传输等其他因素,减排效果的科学评估需要更多观测数据的支持.

关键词：挥发性有机物污染特征来源解析

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