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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 Zifen Han 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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Co-production of hydrogen, oxygen, and electricity via an integrated solar-driven system with decoupled water electrolyzer and Na-Zn ion battery

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Journal of Energy Chemistry 2025年第1期100卷 621-627页

作者： Fei Lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia Pan Dengwei Jing Yubin Chen International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen (H_(2)) and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen (O_(2))-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate (NaNiHCF) and Zn^(2+)/Zn as dual redox *** decoupled electrolyzer enables to produce H_(2)and O_(2)in different time and space with almost 100%Faradaic efficiency at 100 mA cm^(-2).Then,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A cm^(-2).By connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

关键词： Hydrogen Electricity Decoupled water electrolyzer Na-Zn ion battery Solar energy

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Interface compatibility between sulfide solid electrolytes and Ni-rich oxide cathode materials:Factors,modification,perspectives

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Journal of Energy Chemistry 2025年第2期101卷 233-262页

作者： Tianwen Yang Haijuan Pei Haijian Lv Shijie Lu Qi Liu Daobin Mu Beijing Key Laboratory of Environmental Science and engineering School of Materials Science an Engineering Beijing Institute of Technology State Key Laboratory of Space power-Sources Technology Shanghai Institute of Space Power-Sources

All-solid-state batteries(ASSBs) assembled with sulfide solid electrolytes(SSEs) and nickel(Ni)-rich oxide cathode materials are expected to achieve high energy density and safety,representing potential candidates for the next-generation energy storage ***,interfacial issues between SSEs and Nirich oxide cathode materials,attributed to space charge layer,interfacial side reactions,and mechanical contact failure,significantly restrict the performances of *** interface degradation is closely related to the components of the composite cathode and the process of electrode *** on the influencing factors of interface compatibility between SSEs and Ni-rich oxide cathode,this article systematically discusses how cathode active materials(CAMs),electrolytes,conductive additives,binders,and electrode fabrication impact the interface *** addition,the strategies for the compatibility modification are ***,the challenges and prospects of intensive research on the degradation and modification of the SSE/Ni-rich cathode material interface are *** review is intended to inspire the development of high-energy-density and high-safety all-solid-state batteries.

关键词： All–solid–state batteries Influencing factors Interface compatibility Ni–rich oxide cathode Sulfide solid electrolyte

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Performance Analysis of a Coupled System based on Organic Rankine Cycle and Double Effect Absorption Refrigeration for Waste Heat Recovery in Data center

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Journal of Thermal Science 2025年第1期34卷 188-205页

作者： LI Peng XU Jiaqi WANG Binbin LIU Jianyang ZHAO Wensheng HAN Zhonghe School of Energy power and Mechanical engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Low Carbon and High Efficiency power Generation Technology North China Electric Power UniversityBaoding 071003China

During data center operation,it generates a significant volume of low-grade waste *** recover waste heat,a coupled system including solar collector,double effect absorption refrigeration and organic Rankine cycle is *** system performance is analyzed in *** the organic Rankine cycle,five organic working fluids(R245fa,R245ca,R123,R11,and R113)are selected.R245fa,R113 and R245ca obtain the maximum net power output,thermal efficiency and exergy efficiency,*** the double effect absorption refrigeration system,the evaporation temperature,condensation temperature,and generation pressure affect the COP and exergy *** the generator pressure is unchanged,the COP increases with increasing evaporation temperature and decreasing condensation *** the COP reaches 1.3,the COP slightly decreases as the evaporation temperature or condensation temperature ***,the exergy efficiency of refrigeration systems exhibits the same trend as the COP,and the exergy efficiency maximum value appears at approximately 0.32.A new performance indicator,rPUE,was defined to evaluate the data center power utilization *** flow distribution ratio and heat source temperature were optimized with multi-objective *** the mass flow distribution rate is 0.6 and the heat source temperature is 441.5 K,rPUE and the total unit production costs of the system obtain the optimal solution.

关键词： data center solar heat collection organic Rankine cycle double effect absorption refrigeration waste heat recovery

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Degradation of carbamazepine by the UVA-LED_(365)/ClO_(2)/NaClO process:Kinetics,mechanisms and DBPs yield

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Journal of Environmental Sciences 2025年第2期148卷 399-408页

作者： Chenyan Hu Yihui Wu Zhengyu Dong Ziyi Dong Shengjie Ji Lili Hu Xinyu Yang Hao Liu College of Environmental and Chemical engineering Shanghai Engineering Research Center of EnergySaving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

A mixed oxidant of chlorine dioxide(ClO_(2))and NaClO was often used in water treatment.A novel UVA-LED(_(365) nm)-activated mixed ClO_(2)/NaClO process was proposed for the degradation of micropollutants in this ***(CBZ)was selected as the target *** with the UVA_(365)/ClO_(2) process,the UVA_(365)/ClO_(2)/NaClO process can improve the degradation of CBZ,with the rate constant increasing from 2.11×10^(−4) sec^(−1) to 2.74×10^(−4) sec^(−1).In addition,the consumption of oxidants in the UVA_(365)/ClO_(2)/NaClO process(73.67%)can also be lower than that of UVA_(365)/NaClO(86.42%).When the NaClO ratio increased,both the degradation efficiency of CBZ and the consumption of oxidants can increase in the UVA_(365)/ClO_(2)/NaClO *** solution pH can affect the contribution of NaClO in the total oxidant *** the pH range of 6.0-8.0,the combination process can generate more active species to promote the degradation of *** change of active species with oxidant molar ratio was investigated in the UVA_(365)/ClO_(2)/NaClO *** ClO_(2) acted as the main oxidant,HO·and Cl·were the main active species,while when NaClO was the main oxidant,ClO·played a role in the *** chloride ion(Cl^(-)),bicarbonate ion(HCO_(3)^(-)),and nitrate ion(NO_(3)^(-))can promote the reaction *** the concentration of NaClO in the reaction solution increased,the generation of chlorates will *** UVA_(365)/ClO_(2)/NaClO process can effectively control the formation of volatile disinfection by-products(DBPs),and with the increase of ClO_(2) dosage,the formation of DBPs can also decrease.

关键词： UVA Chlorine dioxide(ClO_(2)) NaClO Carbamazepine(CBZ) Disinfection by-products

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Enhancing the performance of proton-exchange membrane fuel cell by optimizing the hydrophobicity and porosity of cathode catalyst layer

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Science China Technological Sciences 2025年第3期68卷 76-85页

作者： Yan ZHANG Puping JIA Suyi YANG Jinzhan SU Liejin GUO International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy & Power Engineering Xi'an Jiaotong University

Appropriate hydrophobicity and porosity of the proton-exchange membrane fuel cell（PEMFC） cathode catalyst layer（CCL） are essential for efficient charge and mass transport. In this study, the effects of the CCL hydrophobicity and porosity on PEMFC performance were comprehensively investigated. Compared to a normal CCL, a cathode hydrophobic duallayer catalyst structure(with a 2:1 Pt loading ratio between the inner and outer layers and 9.3% polytetrafluoroethylene（PTFE）in the outer layer) exhibited a 29.8% increase in power density. Among the tested pore-forming agents, ammonium bicarbonate（NH4HCO3） was the most suitable because of its low pyrolysis temperature. The maximum power density of the CCL with a porous structure（prepared with a Pt/C:NH4HCO3mass ratio of 1:3） was 38.3% higher than that of the normal CCL. By simultaneously optimizing the pore structure and hydrophobicity of the CCL, the maximum power density of the cathode hydrophobic dual-layer CCL（DCL） with pores showed a 44.7% increase compared to that of the normal CCL. This study demonstrates for the first time that simultaneously optimizing cathode porosity and hydrophobicity can enhance PEMFC performance.

关键词： proton-exchange membrane fuel cell cathode catalyst layer membrane electrode assemblies polytetrafluoroethylene pore-forming agent

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Analysis of Compressor Cascade Deviation and Surrogate Model Construction Based on Retained Lift

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Journal of Thermal Science 2025年第02期 567-578页

作者： HU Haojie JIN Donghai Aeroengine Simulation Research center School of Energy and Power EngineeringBeihang University

The through-flow method still plays an important role in the design of modern aero-engine,and its accuracy depends on the loss and deviation *** presence of tip clearance will impact the deviation distribution,while the retained lift is somewhat related to this *** achieve a more precise deviation model,this paper utilises the machine learning *** database comprises cascades with tip clearances in training,from which obtains a span-wise deviation model and executes its validation by comparing with experiment *** database is obtained by calculating 16 different geometries of the cascades with tip clearance in different working conditions,introducing the geometrical parameters of the cascades and retained lift as feature *** deviation and the retained lift follow the same trend with tip clearance size and operating conditions *** predict the span-wise distribution of the retained lift using the k-nearest neighbour regression,and then combine with the traditional model to get the distribution of the *** results show that the coefficient of determination of the retained lift coefficient prediction in the test set reaches 81.02%,and the mean absolute error is around 1.32%.Moreover,the trend predictions of cascade deviation distribution for different tip clearance size are all in good agreement with the experimental *** coefficient of determination of the prediction with the simulation is 75.23%,and the mean absolute error is 1.74%.

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Status analysis on sputtering and erosion evaluation methods of ion optic systems

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Chinese Journal of Aeronautics 2025年第1期38卷 254-270页

作者： Long MIAO Tongxun YANG Zhengxi ZHU Chang LU Zhiwen WU Ningfei WANG School of Aerospace engineering Beijing Institute of TechnologyBeijing 100081China Chongqing Innovation center Beijing Institute of TechnologyChongqing 404100China Advanced Aerospace power and Energy Research center Beijing Institute of TechnologyZhuhai 519088China

In the past few decades,ion engines have been widely used in deep-space propulsion and satellite *** aim of extending the thruster lifetime is still one of the most important parts during the design stage of ion *** one of the core components of ion engine,the grid assembly of ion optic systems may experience long-term ion sputtering in extreme electro-thermal environments,which will eventually lead to its structural and electron-backstreaming *** this paper,the current studies of the grid assembly erosion process are systematically analyzed from the aspects of sputtering damage process of grid materials,numerical simulations,and measurements of erosion characteristics of grid *** advantages and disadvantages of various erosion prediction models are highlighted,and the key factors and processes affecting the prediction accuracy of grid assembly erosion patterns are *** different types of experimental methods of grid assembly erosion patterns are *** analysis in this paper is of great importance for selecting the sputter-resistant grid materials,as well as establishing the erosion models and measurement methods to accurately determine the erosion rate and failure modes of grid ***,the working conditions and structure parameters of ion optic systems could be optimized based on erosion models to promote the ion engine lifetime.

关键词： Electric propulsion Ion optic systems Sputtering yield Erosion characteristics Erosion pattern measurement Lifetime evaluation

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Model Predictive Control Scheduling Strategy for Hydrogen-doped Integrated Energy System Considering Ladder Carbon Trading

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Journal of Thermal Science 2025年第02期 337-351页

作者： JI Zhishi ZHANG Hanqing WANG Pei School of engineering Southern Methodist University Lyle College of Electrical and power engineering Hohai University engineering Research center of Renewable power Generation Technologies of Ministry of Education Hohai University

To achieve low-carbon economic operation of hydrogen-doped integrated energy systems while mitigating the stochastic impact of new energy outputs on the system,the coordinated operation mode of hydrogen-doped gas turbines and electrolyzers is focused on,as well as a hybrid energy storage scheme involving both hydrogen and heat storage and an optimized scheduling model for integrated energy systems encompassing electricity-hydrogen-heat-cooling conversions is established.A model predictive control strategy based on deep learning prediction and feedback is proposed,and the effectiveness and superiority of the proposed strategy are demonstrated using error penalty ***,the introduction of hydrogen energy exchange and ladder carbon trading is shown to effectively guide the low-carbon economic operation of hydrogen-doped integrated energy systems across multiple typical scenarios.A sensitivity analysis is conducted based on this framework,revealing that increases in the hydrogen doping ratio of turbines and the carbon base price led to higher system operation costs but effectively reduce carbon emissions.

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Intermetallic compounds for nitrogen electrochemistry

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Green Energy & Environment 2025年第2期10卷 268-291页

作者： Haohong Wei Cheng Tang Yanyun Wang Yongcheng Feng Huancong Shi Mingjin Cui Huakun Liu Shixue Dou Laiquan Li Institute of Energy Materials Science School of Energy and Power EngineeringUniversity of Shanghai Science and TechnologyShanghai200093China Tsinghua center for Green Chemical engineering Electrification(CCEE) Department of Chemical EngineeringTsinghua UniversityBeijing100084China State Grid New Energy Cloud Carbon Neutralization Innovation center State Grid Zhejiang Electric Power Co.LtdHuzhou Power Supply CompanyZhejiang313000China Shanghai Marine Diesel Engine Research Institute.Shanghai 201108China

Electrochemical nitrogen transformation techniques represent a burgeoning avenue for nitrogen pollutant remediation and synthesizing valuable nitrogenous products from atmospheric *** compounds(IMCs)nanocrystals,featured with unique geometric,electronic and functional properties,have emerged as promising *** review discusses various synthesis approaches for IMCs,including thermal annealing,wet chemical synthesis,electrochemical synthesis,and other emerging methods,analyzing their advantages and *** we summarized the recent advances of IMCs in electrocatalytic nitrogen transformation reactions,such as nitrate reduction reaction,nitric oxide reduction reaction,nitrogen reduction reaction,and hydrazine oxidation *** significant progress,challenges remain in the field,particularly in adopting more refined strategies to improve catalyst performance and *** review aims to comprehensively understand the structural properties of IMCs and their structure-performance relationship,guiding the development of more efficient and stable catalysts for future nitrogen electrochemistry.

关键词： Intermetallic compounds Electrocatalysis Nitrogen transformation reactions Synthesis methods Catalyst design

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