检索结果-南通市图书馆

基于改进LSTM-TCN模型的分布式光伏功率预测研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子设计工程 2024年第16期32卷 187-190,195页

作者：陈建军李良杰卢泽汉国网冀北电力有限公司唐山供电公司河北唐山432500

光伏发电受天气因素的影响,造成供电的稳定性降低,使得光伏功率预测准确性不高。为保证供电服务质量,提出一种基于改进LSTM-TCN的预测模型。利用灰色关联度算法选取光伏功率影响因素,通过相似度计算,获取分布式光伏功率值,组成训练样本... 详细信息

光伏发电受天气因素的影响,造成供电的稳定性降低,使得光伏功率预测准确性不高。为保证供电服务质量,提出一种基于改进LSTM-TCN的预测模型。利用灰色关联度算法选取光伏功率影响因素,通过相似度计算,获取分布式光伏功率值,组成训练样本数据。将LSTM与TCN结合,构建改进LSTM-TCN预测模型,并通过模型训练,得到成熟的预测模型。实验结果表明,所研究模型预测结果的平均平方差和平均绝对误差率分别为0.562 6 kW和2.653 2%,远低于另外两种对比方法,表明所提方法的功率预测准确性高。

关键词：改进LSTM-TCN模型分布式光伏功率训练样本数据预测模型

在线全文

学校读者我要写书评

暂无评论

多类型灵活资源的建模与分层式协调控制架构

分布式能源 2024年第1期9卷 10-18页

作者：田新成文艺林卢泽汉侯鑫垚胡泽春国网唐山供电公司河北省唐山市063009 清华大学电机系北京市海淀区100084

电力需求侧可控的负荷、发电和储能资源统称为灵活资源,这些资源对智能电网的优化运行和消纳新能源发电具有重要作用。首先提出了一种通用灵活资源模型,该模型能够统一描述需求侧居民、商业、工业多类型灵活资源的特性,并能同时描述大... 详细信息

电力需求侧可控的负荷、发电和储能资源统称为灵活资源,这些资源对智能电网的优化运行和消纳新能源发电具有重要作用。首先提出了一种通用灵活资源模型,该模型能够统一描述需求侧居民、商业、工业多类型灵活资源的特性,并能同时描述大规模灵活资源的集总用电需求。基于所提的通用灵活资源模型,构建了一种包含日前和实时阶段大规模多类型需求侧灵活资源的分层协调控制架构,该构架考虑了垂直调度和电力市场条件下电力系统的运行机制,在2种运行机制下都能够有效地利用多类型灵活资源的可调节能力提升电网整体的运行效率。将所提灵活资源模型嵌入到IEEE 30节点系统的机组组合问题中进行仿真,验证了所提分层式协调控制架构的有效性。

关键词：需求侧响应灵活资源分层协调居民负荷工业负荷商业负荷聚合模型

在线全文

学校读者我要写书评

暂无评论

光伏发电系统与可投切负荷协调控制策略

电力系统自动化 2013年第13期37卷 10-16页

作者：刘云卢泽汉章雷其赵波辛焕海浙江大学电气工程学院浙江省杭州市310027 浙江省电力试验研究院浙江省杭州市310014

提出一种光伏与可投切负荷的协调控制策略,利用光伏出力的可快速调节特性以及可投切负荷容量较大的特点,通过求解混合整数优化问题,确定各台光伏的实时参考出力以及各台可投切负荷的工作状态,并使用基于二次插值算法的功率控制策略,使... 详细信息

提出一种光伏与可投切负荷的协调控制策略,利用光伏出力的可快速调节特性以及可投切负荷容量较大的特点,通过求解混合整数优化问题,确定各台光伏的实时参考出力以及各台可投切负荷的工作状态,并使用基于二次插值算法的功率控制策略,使各台光伏的出力快速跟踪其参考值,从而实现协调控制系统净出力的灵活可调。所设计的协调控制系统具有与传统混合储能系统类似的外部特性(如大功率的快速充放电),可为高渗透率的新能源电网提供必要的支持(如一次调频等)。此外,它还具有容量易于扩充、造价低廉等传统储能系统不具备的优势。基于微电网的仿真结果验证了该控制策略的可行性。

关键词：光伏发电系统可投切负荷二次插值协调优化控制一次调频

High-efficiency prediction method for helicopter global/ground noise based on near-field acoustic holography

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 271-284页

作者： Mengxue SHAO Yang lu Xice XU Jiaxin lu National Key Laboratory of Helicopter Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Noise reduction program design is an effective approach that relies on efficient noise prediction for reducing ground noise during *** existing noise prediction methods have the limitations of being computationally expensive or only applicable to *** this paper,a High-Efficiency Prediction Method(HEPM)for helicopter global/ground noise based on near-field acoustic holography is *** HEPM can predict the global noise based on acoustic modal analysis and has the advantages of high prediction accuracy and low time *** process is given as follows:firstly,the rotor noise on the holographic surface in the specified flight is obtained by simulations or ***,the global noise model,which maps time-domain noise to acoustic modes,is established based on near-field acoustic holography and Fourier acoustic analysis ***,combined with acoustic modal amplitude,the model established enables efficiently predicting the global/ground noise in the corresponding flight *** verify the accuracy of the prediction method,a simulation study is conducted in hovering and forward flight states using a model helicopter with a 2-meter rotor and Rotor Body Interaction(ROBIN)*** comparison of HEPM with numerical results shows that the average prediction errors of the global and ground noise are less than 0.3 dB and 0.2 dB,*** a region containing 100000 observers,the computation time of the HEPM is only one-fifth of that of the acoustic hemisphere method,demonstrating the rapidity of the proposed method.

关键词： Helicopter Rotor noise prediction Noise abatement procedure design Acoustic modal analysis Near-field acoustic holography

在线全文

学校读者我要写书评

暂无评论

责任清单中责任追究问题研究

辽宁公安司法管理干部学院学报 2017年第4期 74-79页

作者：周实鲁泽汉东北大学辽宁沈阳110000

自责任清单制度推行以来,各省级人民政府先后推出责任清单,对明确责任、追究责任等事项进行梳理和公示。但从现阶段情况来看,当前已经建立的省级政府责任清单中追责机制的建设暴露出许多问题。有必要从责任的内涵和责任追究对责任清单... 详细信息

自责任清单制度推行以来,各省级人民政府先后推出责任清单,对明确责任、追究责任等事项进行梳理和公示。但从现阶段情况来看,当前已经建立的省级政府责任清单中追责机制的建设暴露出许多问题。有必要从责任的内涵和责任追究对责任清单的作用出发,梳理责任追究事项中存在的问题,对责任清单制度进行必要的完善。

关键词：清单制度责任清单责任追究限制权力权力监督

Optical grade (Gd_(0.95-x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12) ceramics with near-zero optical loss: Effects of lu^(3+) doping on structural feature, microstructure evolution, and far-red luminescence

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第1期13卷 113-123页

作者： Zhigang Sun Ji-Guang Li Huiyu Qian Yoshio Sakka Tohru SSuzuki Bin lu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Research Center for Electronic and Optical Materials National Institute for Materials ScienceIbaraki 305-0044Japan Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China

A chemical co-precipitation strategy was employed to synthesize a series of(Gd_(0.95−x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12)(x=0.1−0.95)powder phosphors,followed by vacuum sintering to achieve transparent garnet ceramic *** density functional theory indicated lu_(3)Al_(5)O_(12) was formed in priority compared with Gd_(3)Al_(5)O_(12) during solid-phase *** high-temperature sintering,the lu^(3+)substitution for Gd^(3+)suppressed point mass diffusion leading to a smaller grain *** in-line transmittances of bulk specimens with x=0.1,0.3,0.5,0.7,and 0.95 nm were~83.5%,80.1%,68.8%,73.7%,and 82.2%at 710 nm(Eu^(3+)emission center),respectively,among which the sample of x=0.1 exhibited the optical grade with near-zero optical loss in agreement with the defect-free single crystal(~100%of the theoretical transmittance).The resulting particle and ceramic materials both presented characteristic Eu^(3+)emission arising from 5D0→7FJ(J=1−4)transition,where the dominant far-red emission at~710 nm arising from ^(5)D_(0)→^(7)F_(4) transition overlapped with the absorption of phytochrome(PFR).The photoluminescence excitation and photoluminescence intensities of(Gd_(0.95−x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12) powders and ceramics generally increased at a higher Gd^(3+)/lu^(3+)***^(3+)dopants delayed the fluorescence lifetime while the bulk samples had shorter lifetime compared to the particle *** transparent(Gd_(0.85)lu_(0.1)Eu_(0.05))3Al_(5)O_(12) ceramic phosphor exhibited good thermal stability with a high thermal quenching temperature above 533 *** designed ceramic phosphor-converted light-emitting diode had a saturation injection current of 435 mA and a current-dependent color rendering *** importantly,our report marked the developmental stage of transparent ceramic materials towards zero optical loss.

关键词： transparent ceramics garnet phosphors light-emitting diode(LED) optical properties Gibbs free energy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电网接入光伏发电功率的实时调度与预测研究

电网与清洁能源 2023年第12期39卷 141-147页

作者：徐其春李良杰卢泽汉国网冀北电力有限公司唐山供电公司河北唐山063000

光伏发电并网的容量具有随机性,其供电功率振荡会严重威胁电网安全稳定运行。提出基于实时调度的电网接入光伏发电功率预测方法。根据辐射量对电网接入光伏发电功率的关系曲线、电网接入光伏输出功率和温度的曲线、电网接入光伏发电功... 详细信息

光伏发电并网的容量具有随机性,其供电功率振荡会严重威胁电网安全稳定运行。提出基于实时调度的电网接入光伏发电功率预测方法。根据辐射量对电网接入光伏发电功率的关系曲线、电网接入光伏输出功率和温度的曲线、电网接入光伏发电功率和湿度之间的关系曲线,分析了电网接入光伏发电功率的影响因素;为避免光伏发电功率差异性较大带来预测结果不准确的问题,对电网接入光伏发电功率数据完成归一化处理;结合发电功率日特征相似度的计算结果,计算了权重欧式距离,获取具有最大影响力的功率数据,完成电网接入光伏发电功率的预测。实验结果表明,应用研究方法时,电网接入光伏发电功率的预测偏差始终低于0.05,获取的电网接入光伏发电功率预测结果始终分布在根据实际情况设定的阈值区间内。

关键词：实时调度发电功率功率预测电网接入光伏发电系统辐射量

Collective Molecular Machines: Multidimensionality and Reconfigurability

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第8期16卷 309-340页

作者： Bin Wang Yuan lu Department of Chemical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Molecular machines are key to cellular activity where they are involved in converting chemical and light energy into efficient mechanical *** the last 60 years,designing molecular structures capable of generating unidirectional mechanical motion at the nanoscale has been the topic of intense *** progress has been made,attributed to advances in various fields such as supramolecular chemistry,biology and nanotechnology,and ***,individual molecular machines are only capable of producing nanometer work and generally have only a single *** order to address these problems,collective behaviors realized by integrating several or more of these individual mechanical units in space and time have become a new *** this review,we comprehensively discuss recent developments in the collective behaviors of molecular *** particular,collective behavior is divided into two *** is the appropriate integration of molecular machines to efficiently amplify molecular motions and deformations to construct novel functional *** other is the construction of swarming modes at the supramolecular level to perform nanoscale or microscale *** discuss design strategies for both modes and focus on the modulation of features and ***,in order to address existing challenges,the idea of transferring experience gained in the field of micro/nano robotics is presented,offering prospects for future developments in the collective behavior of molecular machines.

关键词： Molecular machines Collective control Collective behaviors DNA Biomolecular motors

Soil inorganic amendments produce safe rice by reducing the transfer of Cd and increasing key amino acids in brown rice

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 121-132页

作者： Fanyi Kong Shenggao lu Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Key Laboratory of Environmental Remediation and Ecosystem HealthMinistry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

The digestibility of cadmium(Cd)in brown rice is directly related to amino acid metabolism in rice and human *** our field study,three kinds of alkaline calcium-rich soil inorganic amendments(SIAs)at three dosages were applied to produce safe rice and improve the quality of rice in Cd-contaminated *** the increased application of SIA,Cd content in iron plaque on rice root significantly increased,the transfer of Cd from rice root to grain significantly decreased,and then Cd content in brown rice decreased *** vitro digestibility of Cd in brown rice was estimated by a physiologically based extraction *** showed that more than 70%of Cd in brown rice could be digested by simulated gastrointestinal *** on the total and digestible Cd contents in brown rice to evaluate the health risk,the application of 2.25 ton SIA/ha could produce safe rice in acidic slightly Cd-contaminated paddy *** amino acids(AAs)in brown rice were determined by high-performance liquid *** contents of 5 key AAs(KAAs)that actively respond to environmental changes increased significantly with the increased application of *** structural equation model indicated that KAAs could be affected by the Cd translocation capacity from rice root to grain,and consequently altered the ratio of indigestible Cd in brown *** formation of indigestible KAAs-Cd complexes by combining KAAs(phenylalanine,leucine,histidine,glutamine,and asparagine)with Cd in brown rice could be considered a potential mechanism for reducing the digestibility of Cd.

关键词： Cadmium digestibility Soil inorganic amendments Safe rice Amino acid Priming effect Health risk