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Coordinated Control Strategy of New Energy Power Generation System with Hybrid Energy Storage Unit

Energy Engineering 2025年第1期122卷 167-184页

作者： Yun Zhang ZifenHan Biao Tian Ning Chen Yi Fan school of Mechano-Electronic Engineering Xidian UniversityXi’an710071China Electric Power Control Center State Grid Gansu Electric Power CompanyLanzhou730030China Electric Power Control Center State Grid Gansu Electric Power Company Zhangye Power Supply BranchZhangye734000China

The new energy power generation is becoming increasingly important in the power *** as photovoltaic power generation has become a research hotspot,however,due to the characteristics of light radiation changes,photovoltaic power generation is unstable and random,resulting in a low utilization rate and directly affecting the stability of the power *** solve this problem,this paper proposes a coordinated control strategy for a newenergy power generation system with a hybrid energy storage unit based on the lithium iron phosphate-supercapacitor hybrid energy storage ***,the variational mode decomposition algorithm is used to separate the high and low frequencies of the power signal,which is conducive to the rapid and accurate suppression of the power fluctuation of the energy storage ***,the fuzzy control algorithm is introduced to balance the power between energy *** this paper,the actual data is used for simulation,and the simulation results show that the strategy realizes the effective suppression of the bus voltage fluctuation and the accurate control of the internal state of the energy storage unit,effectively avoiding problems such as overshoot and over-discharge,and can significantly improve the stability of the photovoltaic power generation systemand the stability of the Direct Current *** is of great significance to promote the development of collaborative control technology for photovoltaic hybrid energy storage units.

关键词： Photovoltaic power suppression hybrid energy storage unit variationalmodal decomposition fuzzy control power distribution control

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Changing characteristics and spatial differentiation of spring precipitation in Southwest China during 1961-2012

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Chinese Physics B 2015年第2期24卷 526-533页

作者：刘洪兰张强张俊国胡文超郭俊琴王胜 zhangye Meteorological Bureau Institute of Arid Meteorology China Meteorological AdministrationKey Laboratory of Arid Climatic Change and Disaster Reduction of Gansu ProvinceKey Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration zhangye middle school Meteorological Service Center of Gansu Province Northwest Regional Climate Center Jinta County Meteorological Bureau

In this study,we analyze spring precipitation from 92 meteorological stations spanning between 1961 and 2012 to understand temporal-spatial variability and change of spring precipitation over Southwest *** analysis methods are used for different purposes,including empirical orthogonal function（EOF） analysis and rotated EOF（REOF） for analyzing spatial structure change of precipitation anomaly,and the Mann-Kendall testing method to determine whether there were abrupt changes during the analyzed time *** find that the first spatial mode of the precipitation has a domain uniform structure;the second is dominated by a spatial dipole;and the third contains five variability *** 2000 s is the decade with the largest amount of precipitation while the 1990 s is the decade with the smallest amount of *** year-to-year difference of that region is large：the amount of the largest precipitation year doubles that of the smallest precipitation *** also find that spring precipitation in Southwest China experienced a few abrupt changes：a sudden increase at 1966,a sudden decrease at 1979,and a sudden increase at *** speculate that the spring precipitation will increase gradually in the next two decades.

关键词： spring precipitation temporal-spatial structure 500-hPa level Southwest region

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H-tensors and nonsingular H-tensors

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Frontiers of Mathematics in China 2016年第3期11卷 557-575页

作者： Xuezhong WANG Yimin WEI school of Mathematical Sciences Fudan University Shanghai 200433 China school of Mathematics and Statistics Hexi University Zhangye 734000 China

The H-matrices are an important class in the matrix theory, and have many applications. Recently, this concept has been extended to higher order H-tensors. In this paper, we establish important properties of diagonally dominant tensors and H-tensors. Distributions of eigenvalues of nonsingular symmetricH-tensors are given. An J（t%-tensor is semi-positive, which enlarges the area of semi-positive tensor from H-tensor to H＋-tensor. The spectral radius of Jacobi tensor of a nonsingular （resp. singular） H-tensor is less than （resp. equal to） one. In particular, we show that a quasi-diagonally dominant tensor is a nonsingular H-tensor if and only if all of its principal sub-tensors are nonsingular H-tensors. An irreducible tensor H is an H-tensor if and only if it is quasi-diagonally dominant.

关键词： Diagonally dominant irreducible diagonally dominant H-tensor,nonsingular

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Cross-sections for(n,2n),(n,α),(n,p),(n,d),and(n,t)reactions on molybdenum isotopes in the neutron energy range of 13 to 15 MeV

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Chinese Physics C 2020年第11期44卷 94-108页

作者： Junhua Luo Li Jiang Institute of New Energy Hexi UniversityZhangye 734000China school of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China Institute of Nuclear Physics and Chemistry Chinese Academy of Engineering PhysicsMianyang 621900China

Given the insufficient cross-sectional data regarding the 14-MeV-neutron experiment of molybdenum,the vital fusion reactor structural material,and the significant heterogeneities among the reported values,this study examined the(n,2n),(n,α),(n,p),(n,d),and(n,t)reaction cross sections in molybdenum isotopes based on the neutrons produced via a T(d,n)4He reaction carried out in the Pd-300 Neutron Generator at the China Academy of Engineering Physics(CAEP).A high-resolution gamma-ray spectrometer,which was equipped with a coaxial high-purity germanium detector,was used to measure the product nuclear gamma *** addition,27Al(n,α)24Na and 93Nb(n,2n)92mNb reactions were utilized as the neutron fluence *** experimental 92Mo(n,2n)91Mo,94Mo(n,2n)93mMo,100Mo(n,2n)99Mo,98Mo(n,α)95Zr,100Mo(n,α)97Zr,92Mo(n,p)92mNb,96Mo(n,p)96Nb,97Mo(n,p)97Nb,98Mo(n,p)98mNb,92Mo(n,d)91mNb,and 92Mo(n,t)90Nb reaction cross sections were acquired within the 13-15 MeV neutron energy ***,we compared and analyzed these obtained cross sections based on the existing IAEA-EXFOR database-derived experimental data,together with evaluation results corresponding to ENDF/B-Ⅷ.0,JEFF-3.3,BROND-3.1,and CENDL-3.1 and the theoretical outcomes acquired through TALYS-1.95 and EMPIRE-3.2.3(nuclear-reaction modeling tools).

关键词： neutron-induced reaction cross sections of Mo excitation function molybdenum isotopes D+T neutron source off-lineγ-ray spectrometry TALYS-1.95 and EMPIRE-3.2.3

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New cross-section measurements for the (n, 2n), (n, p), and (n, a) reactions on bromine in the 14 MeV region with detailed uncertainty quantification

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Chinese Physics C 2023年第3期47卷 93-106页

作者：贺龙罗均华蒋励 school of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China Institute of New Energy Hexi UniversityZhangye734000China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

Measurement of the cross-sections of the ^(79)Br(n,2n)^(78)Br,^(81)Br(n,p)^(81)mSe,^(81)Br(n,α)^(78)As,and ^(79)Br(n,α)^(76)As reactions was performed at specific neutron energies,precisely,13.5±0.2,14.1±0.2,14.4±0.2,and 14.8±0.2 MeV,relative to the standard ^(93)Nb(n,2n)^(92)mNb and ^(27)Al(n,α)^(24)Na reference reactions using offlineγ-ray spectrometry and neutron *** neutrons were generated at the China Academy of Engineering Physics via a ^(3)H(d,n)^(4)He reaction using the K-400 Neutron Generator equipped with a solid ^(3)H-Ti based *** activity of the reaction produce was obtained using a high-purity germanium *** cross-sections of the(n,2n),(n,p),and(n,α)reactions on the bromine isotopes were measured in the 13–15 MeV neutron energy *** covariance analysis approach was employed for a thorough inspection of any uncertainties within the measured cross-section data.A discussion and comparison of the observed outcome were carried out with previously published data,especially with the results of the JENDL-4.0,JEFF-3.3,TENDL-2019,and ENDF/B-VIII.0 data libraries,along with the theoretical excitation function curve derived by employing the TALYS-1.95 *** cross-section restrictions for the investigated processes in the 13–15 MeV neutron energy range will be obtained using the current findings,which will help to raise the caliber of associated ***,the parameters of relevant nuclear reaction models can be verified using this data.

关键词： ^(79,81)Br sotopes 4 MeV neutron (n,2n) (n,p) and(n,a)reactions crss-section covariance analysis

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New technology for comprehensive utilization of aluminum-chromium residue from chromium salts production

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中国有色金属学会会刊：英文版 2008年第2期18卷 463-468页

作者：李小斌齐天贵江新民周秋生刘桂华彭志宏韩登仑张忠元杨昆山 school of Metallurgical Science and Engineering Central South University Changsha 410083 China Gansu Jinshi Chemical Engineering Corporation Ltd. Zhangye 734000 China

Colloidal aluminum-chromium residue(ACR)was mass-produced in chromate production process,and the large energy consumption and high recovery cost existed in traditional methods of utilizing such *** overcome those problems,a new comprehensive method was proposed to deal with the ACR,and was proven valid in *** the new process,the chromate was separated firstly from the colloidal ACR by ripening and washing with additives,by which more than 95%hexavalent chromium was *** chromium-free aluminum residue(CFAR),after properly dispersed,was digested at 120-130℃and more than 90% alumina can be *** then the pregnant aluminate solution obtained from digestion was seeded to precipitate aluminum *** new method can successfully recover both alumina and sodium chromate,and thus realize the comprehensive utilization of ACR from chromate industry.

关键词：铝铬冶金技术合金羟化物

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Measurements of the^(128)Te(n,2n)^(127m,g)Te reaction cross sections and isomeric cross section ratio of^(127m,g)Te at the neutron energy of 14 MeV

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Chinese Physics C 2024年第12期48卷 107-117页

作者： Junhua Luo Long He Liang Zhou Li Jiang Department of Basic Science Lanzhou Institute of TechnologyLanzhou 730050China Institute of New Energy Hexi UniversityZhangye 734000China school of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

In this study,measurements of the^(128)Te(n,2n)^(127m,g)Te reaction cross sections and the computation of the isomeric cross section ratio were performed around the neutron energy of 13−15 *** used aγ-ray spectrometric technique to conduct the *** neutron energy was produced by the^(3)H(d,n)^(4)He *** the^(128)Te(n,2n)^(127m,g)Te reaction,the excited state,ground state,total cross section,and isomeric cross section ratio were determined using the TALYS-1.96 code,a theoretical nuclear model that allows for variations in density *** initial experimental data,assessed nuclear data,and theoretical calculations based on the TALYS-1.96 algorithm were compared with the measurement *** new data produced by this study are essential for validating nuclear models and establishing parameters for nuclear reactions.

关键词： ^(128)Te(n,2n)^(127mg)Te reactions activation method secondary nuclear method nuclear cross section theoretical calculations with the TALYS-1.96

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Bose–Einstein condensates with tunable spin–orbit coupling in the two-dimensional harmonic potential: The ground-state phases, stability phase diagram and collapse dynamics

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Frontiers of physics 2022年第6期17卷 219-233页

作者： Chen Jiao Jun-Cheng Liang Zi-Fa Yu Yan Chen Ai-Xia Zhang Ju-Kui Xue College of Physics and Electronics Engineering Northwest Normal UniversityLanzhou 730070China school of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China

We study the ground-state phases,the stability phase diagram and collapse dynamics of Bose–Einstein condensates(BECs)with tunable spin–orbit(SO)coupling in the two-dimensional harmonic potential by variational analysis and numerical *** we propose the theory that the collapse stability and collapse dynamics of BECs in the external trapping potential can be manipulated by the periodic driving of Raman coupling(RC),which can be realized *** the high-frequency approximation,an effective time-independent Floquet Hamiltonian with two-body interaction in the harmonic potential is obtained,which results in a tunable SO coupling and a new effective two-body interaction that can be manipulated by the periodic driving *** the variational method,the phase transition boundary and collapse boundary of the system are obtained analytically,where the phase transition between the spin-nonpolarized phase with zero momentum(zero momentum phase)and spin-polarized phase with non-zero momentum(plane wave phase)can be manipulated by the external driving and sensitive to the strong external trapping ***,it is revealed that the collapsed BECs can be stabilized by periodic driving of RC,and the mechanism of collapse stability manipulated by periodic driving of RC is clearly *** addition,we find that the collapse velocity and collapse time of the system can be manipulated by periodic driving strength,which also depends on the RC,SO coupling strength and external trapping ***,the variational approximation is confirmed by numerical simulation of Gross–Pitaevskii *** results show that the periodic driving of RC provides a platform for manipulating the ground-state phases,collapse stability and collapse dynamics of the SO coupled BECs in an external harmonic potential,which can be realized easily in current experiments.

关键词： spin-orbit coupled Bose-Einstein condensates stability collapse dynamics

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High-order harmonic generation of ZnO crystals in chirped and static electric fields

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Chinese Physics B 2024年第1期33卷 335-343页

作者：张玲玉何永林谢卓璇高芳艳徐清芸葛鑫磊罗香怡郭静 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China school of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China Institute of Theoretical Physics Hexi UniversityZhangye 734000China College of Physical Science and Technology Bohai UniversityJinzhou 121013China College of Physics and Electronic Information Baicheng Normal UniversityBaicheng 137000China

High harmonic generation in ZnO crystals under chirped single-color field and static electric field are investigated by solving the semiconductor Bloch equation(SBE). It is found that when the chirp pulse is introduced, the interference structure becomes obvious while the harmonic cutoff is not extended. Furthermore, the harmonic efficiency is improved when the static electric field is included. These phenomena are demonstrated by the classical recollision model in real space affected by the waveform of laser field and inversion symmetry. Specifically, the electron motion in k-space shows that the change of waveform and the destruction of the symmetry of the laser field lead to the incomplete X-structure of the crystal-momentum-resolved(k-resolved) inter-band harmonic spectrum. Furthermore, a pre-acceleration process in the solid four-step model is confirmed.

关键词： high-order harmonic generation the semiconductor Bloch equation k-resolved inter-band harmonic spectrum four-step semiclassical model

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Ground-State Properties of Superfluid Fermi Gas in Fourier-Synthesized Optical Lattices

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Chinese Physics Letters 2014年第3期31卷 5-9页

作者： CHEN Yan ZHANG Ke-Zhi WANG Xiao-Liang CHEN Yong school of Physics and Electromechanical Engineering Hexi University Zhangye 734000 Center of Soft Matter Physics and its Applications Beihang University Beijing 100191 school of Physics and Nuclear Energy Engineering Beihang University Beijing 100191

By employing the balance condition between the lattice potential and the interatomic interaction, we study the ground state solutions of superfluid Fermi gases in Fourier-synthesized （FS） optical lattices. The average energy of the ground state, the atoms number, and the atom density distribution of the Fermi system are analytically derived along the Bose–Einstein condensation （BEC） side to the Bardeen–Cooper–Schrieffer （BCS） side. We analyze the properties of ground state solutions at both the BEC limit and unitarity in FS optical lattices. It is found that the relative phase α between the two lattice harmonics impacts greatly on the properties of the ground state of the superfluid Fermi gas. Especially in the BCS limit, when α=π/2, the average energy presents an exponential form with the increase of the potential depth of the lattice harmonics v2. Meanwhile, there exits a minimal value. Moreover, due to the Fermi pressure, the atom density distribution at unitarity is more outstretched than that in the BEC limit. The average energy at unitarity is apparently larger than that in the BEC limit. The properties of the ground state solution exhibit very different behaviors when the system transits from the BEC side to the BCS side.

关键词： Bose-Einstein condensation

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