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Power-balancing Coordinated Control of Wind Power and Demand-side Response Under Post-fault Condition

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Journal of Modern Power Systems and Clean energy 2022年第5期10卷 1207-1215页

作者： Xinshou Tian Yongning Chi Chao Liu Peng Cheng Yan Li China Electric Power research Institute Beijing 100192China North China Electric Power University Beijing 102206China State Key Laboratory of Operation and Control of Renewable energy&Storage Systems(China Electric Power research Institute) Beijing 100192China China Institute of energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China

As the global energy transforms to renewablebased power system, the wind power generation has experienced a rapid increase. Due to the loss of synchronous machines and its frequency control mechanisms, the gradual evolution leads to critical challenges in maintaining the frequency stability. Under post-fault condition, the wind power generation has a slow recovery due to the fault ride-through(FRT) control strategy and may cause a larger frequency deviation due to the power imbalance between the supply and demand. Then, the impacts of the frequency deviations would further cause inaccuracy and instability in the control system for wind power generation. Considering the long parking time of electric vehicles(EVs), the demand-side response is provided to support the power grid via load-to-grid technology. Thus, a power-balancing coordinated control strategy of the wind power and the demand-side response is developed. It can significantly mitigate the power imbalance, thereby resulting in the enhanced frequency stability. Finally, the simulation results are provided to validate the power-balancing coordinated control strategy.

关键词： Power-balancing wind power demand-side response frequency stability post-fault condition

Arc Grounding Fault Identification Using Integrated Characteristics in the Power Grid

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energy Engineering 2024年第7期121卷 1883-1901页

作者： Penghui Liu Yaning Zhang Yuxing Dai Yanzhou Sun School of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo454003China research and Development Center Guangdong Zhicheng Champion Group Co.Ltd.Dongguan523000China Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment Henan Polytechnic UniversityJiaozuo454003China

Arc grounding faults occur frequently in the power grid with small resistance grounding neutral *** existing arc fault identification technology only uses the fault line signal characteristics to set the identification index,which leads to detection failure when the arc zero-off characteristic is *** solve this problem,this paper presents an arc fault identification method by utilizing integrated signal characteristics of both the fault line and sound ***,the waveform characteristics of the fault line and sound lines under an arc grounding fault are *** that,the convex hull,gradient product,and correlation coefficient index are used as the basic characteristic parameters to establish fault identification ***,the logistic regression algorithm is employed to deal with the reference samples,establish the machine discrimination model,and realize the discrimination of fault ***,simulation test results and experimental results verify the accuracy of the proposed *** comparison analysis shows that the proposed method has higher recognition accuracy,especially when the arc dissipation power is smaller than 2×10^(3) W,the zero-off period is not *** conclusion,the proposed method expands the arc fault identification theory.

关键词： Arc fault convex hull algorithm correlation coefficient fault identification gradient logistic regression

Scalable synthesis of N-doped Si/G@voids@C with porous structures for high-performance anode of lithium-ion batteries

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Rare Metals 2023年第12期42卷 4091-4102页

作者： Lei Wang Yan Jiang Shao-Yuan Li Xiu-Hua Chen Feng-Shuo Xi Xiao-Han Wan Wen-Hui Ma Rong Deng Faculty of Metallurgical and energy Engineering State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093China School of Materials Science and Engineering Yunnan UniversityKunming 650091China School of Science and technology Pu'erUniversityPu'er 665000China School of Photovoltaic and Renewable energy Engineering(SPREE) University of New South WalesSydney 2052Australia

The co-utilization of silicon(Si) and graphite(G) has been considered as the preferred strategy to achieve high energy density anode materials,but the effective synergistic integration of Si and graphite is still a challenge and it is necessary to find a scheme to accommodate the large-scale production of Si/graphite *** this work,silicon cutting waste from the photovoltaic industry was used as raw material,mixed with graphite,pitch,and polyvinylpyrrolidone,and subjected to high-energy ball *** mixture was then heated in an Ar atmosphere for the carbon coating,and the resulting Si/graphite/carbon(Si/G/C) composite was etched to remove the thicker SiOx layer formed on the Si surface to allow the pores between the Si and the carbon matrix to obtain Si@voids/G@*** from the integrated structural design and the significantly enhanced electronic conductivity,the Si/G@voids@C composite exhibited the first dischargespecific capacity of 2530 mAh·g^(-1) with an initial coulombic efficiency(ICE) of 86.7%,and the remaining capacity exceeded 1000 mAh·g^(-1) after 550 cycles at 1.5A·g^(-1).Notably,full lithium-ion batteries with a Si/G@voids@C anode and LiFePO_4 cathode delivered a stable capacity of 140 mAh·g^(-1).The synthesis method is facile and cost-effective,providing an integration strategy for Si and G with a potential scheme for large-scale commercial applications.

关键词： Silicon/graphite anodes Surface coating Integration strategy Silicon cutting waste High-energy ball milling Lithium-ion battery(LIB)

Filling Ti_(3)C_(2)T_(x)nanosheets into melamine foam towards a highly compressible all-in-one supercapacitor

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Nano research 2022年第4期15卷 3254-3263页

作者： Rui Guo Xiying Han Peng Yuan Xuexia He Qi Li Jie Sun Liqin Dang Zonghuai Liu Yating Zhang Zhibin Lei Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologyShaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China College of Chemistry and Chemical Engineering Key Laboratory of Coal Resources Exploration and Comprehensive UtilizationMinistry of Natural ResourcesXi’an University of Science and TechnologyXi’an 710054China

The development of compressible supercapacitors strongly relies on the design of electrode materials combining superior compressibility,high conductivity with the stable electrochemical cycling *** this work,we report a facile yet scalable strategy to construct a highly compressible supercapacitor by integrating the current collector,active materials and the separator into one *** use the highly compressive melamine foam(MF)as scaffold and the Ti_(3)C_(2)T_(x)nanosheets as the active *** the few-layer Ti_(3)C_(2)T_(x)nanosheets into the skeleton of MF by capillary force followed by freeze-drying yields the MF/Ti_(3)C_(2)T_(x)composite with superior structural integrity that can be compressed at a large strain of 50%for 100 *** electrochemical performances of the all-in-one supercapacitor were systematically investigated under diverse compression *** improved conductivity and reduced ion diffusion length allow the all-in-one supercapacitor to exhibit fast ion and electron kinetics even at high strain of 60%,delivering a maximal volumetric specific energy of 0.37 mWh∙cm^(-3)at power density of 0.42 mW∙cm^(-3)and extraordinary cycling performance during the 2,500 compression cycles.

关键词： all-in-one supercapacitor Ti_(3)C_(2)T_(x)MXene melamine foam high compressibility fast ion and electron kinetics

Study on the Impact of Massive Refracturing on the Fracture Network in Tight Oil Reservoir Horizontal Wells

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Fluid Dynamics & Materials Processing 2024年第5期20卷 1147-1163页

作者： Jianchao Shi Yanan Zhang Wantao Liu Yuliang Su Jian Shi Exploration and Development research Institute Changqing Oilfield CompanyXi’an710018China National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields Xi’an710018China Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580China

Class III tight oil reservoirs have low porosity and permeability,which are often responsible for low production rates and limited *** repeated fracturing is a well-known technique to fix some of these *** such methods,existing fractures are refractured,and/or new fractures are created to facilitate communication with natural *** study explored how different refracturing methods affect horizontal well fracture networks,with a special focus on morphology and related fluid flow *** particular,the study relied on the unconventional fracture model(UFM).The evolution of fracture morphology and flow field after the initial fracturing were analyzed *** simulation results indicated that increased formation energy and reduced reservoir stress differences can promote fracture *** was shown that the length of the fracture network,the width of the fracture network,and the complexity of the fracture can be improved,the oil drainage area can be increased,the distance of oil and gas seepage can be reduced,and the production of a single well can be significantly increased.

关键词： Type III tight oil reservoirs refracturing methods horizontal wells fracture network study fracture network evolution

Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets

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Journal of Advanced Ceramics 2023年第12期12卷 2257-2270页

作者： Baokai Wang Zheng Zhao Mengyi Li Mengyang Niu Jialu Tian Chang Yu Shiqin Wan Ming Yue Weiwei Xuan Wenbin Cao Zhaobo Tian Kexin Chen Qi Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal *** nitride nanosheets(BNNs)have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal ***,the small lateral size and weak interface bonding of BNNs enabled them to only form thermally conductive networks through physical overlap,resulting in high interfacial thermal *** address this issue,an innovative strategy based on interface engineering was proposed in this ***-aspect-ratio boron nitride belts(BNbs)were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of *** surface of BNb showed the sintering of numerous smaller-sized BNNs,which precisely addresses the issue of weak interfacial bonding between *** this basis,the as-synthesized BNbs were combined with nano-fibrillated cellulose(NFC)to prepare NFC/BNb composite films through a facile vacuum filtration *** to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages,the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNs films,achieving the highest value of 19.119 W·m^(−1)·K^(−1) at a 20 wt%filling *** addition,the NFC/BNb films also exhibited superior thermal stability,mechanical strength,flexibility,and electrical insulation performance,suggesting the significant application potential of the designed BNb fillers in the thermal management field.

关键词： boron nitride(BN) thermal management materials vacuum filtration flexible thermally conductive films

Integrated diffractive optical neural network with space-time interleaving

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Chinese Optics Letters 2023年第9期21卷 84-90页

作者：符庭钊黄禹尧孙润黄泓皓刘文灿杨四刚陈宏伟 Beijing National research Center for Information Science and technology Department of Electronic EngineeringTsinghua UniversityBeijing 100084China

Integrated diffractive optical neural networks(DONNs)have significant potential for complex machine learning tasks with high speed and ultralow energy ***,the on-chip implementation of a high-performance optical neural network is limited by input *** contrast to existing photonic neural networks,a space-time interleaving technology based on arrayed waveguides is designed to realize an on-chip DONN with high-speed,high-dimensional,and all-optical input signal *** demonstrate the performance of the on-chip DONN with high-speed space-time interleaving modulation,an on-chip DONN with a designed footprint of 0.0945 mm~2is proposed to resolve the vowel recognition task,reaching a computation speed of about 1.4×10^(13)operations per second and yielding an accuracy of 98.3%in numerical *** addition,the function of the specially designed arrayed waveguides for realizing parallel signal inputs using space-time conversion has been verified *** method can realize the on-chip DONN with higher input dimension and lower energy consumption.

关键词： integrated diffractive optical neural networks machine learning arrayed waveguides

Artificial synthesis of polyesters at ambient condition via consecutive CO_(2)electrolysis and fermentation

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Nano research 2024年第7期17卷 6016-6025页

作者： Guiru Zhang Ning Ji Shiheng Lyu Baoxin Ni Peng Shen Ke Ye Yuting Wang Xuheng Jiang Hai Zhang Xi Liu Yongcheng Wang Kun Jiang Department of Laboratory Medicine of The First Affiliated Hospital&Liangzhu Laboratory Zhejiang University School of MedicineHangzhou 310058China Interdisciplinary research Center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China In-situ Centre for Physical Sciences Frontiers Science Center for Transformative MoleculesSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Electrochemically converting CO_(2)into value-added chemicals is a promising approach to mitigate anthropogenic carbon emissions,yet largely limited to short-chained C_(1)–C_(3)***,we demonstrate a tandem artificial synthesis of biodegradable polyhydroxybutyrate(PHB)plastic from CO_(2)building *** synthesis of defects-enriched Bi catalyst is firstly demonstrated by plasma bombardment and following in situ electrochemical reduction,which delivers a HCOOH Faradaic efficiency above 80%at tunable concentration from 2 to 250 mM,an energy efficiency up to 41%,and a single-pass carbon conversion efficiency up to 60%.Annular dark field and second electron microscopic analysis,density functional theory(DFT)calcualtions,coupled with H-type and solid-state electrolyzer assessments,point out the vital role of defective and/or stepped Bi surface sites in promoting CO_(2)-to-HCOOH ***,as-synthesized high-purity HCOOH is used as the sole carbon source for C-chain growth within microbial fermentation reactor with Ralstonia eutropha,where activated formate dehydrogenase and increased metabolites related to Calvin–Benson–Bassham cycle are found to be responsible for the enhanced polyester accumulation.

关键词： CO_(2)electrolysis Bi catalyst vacancy site formic acid fermentation

Sequential Growth of Cs_(3)Bi_(2)I_(9)/BiVO_(4)Direct Z-Scheme Heterojunction for Visible-Light-Driven Photocatalytic CO_(2)Reduction

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Transactions of Tianjin University 2023年第6期29卷 462-472页

作者： Long Jiang Hanrui Du Le Li Xiangjiu Guan Yihao Zhang Liwei Li Xiaoxu Liu Lei Li Yingcheng Tian Li Zhang Shuai Wang Jie Chen Shaohua Shen State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research InstituteXi’an 710077China International research Center for Renewable energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Chemical Engineering and technology Xi’an Jiaotong UniversityXi’an 710049China CNPC National Engineering research Center for Oil and Gas Drilling Equipment Co. Ltd.Baoji 721002China China Coal energy research Institute Co. Ltd.Xi’an 710049China

The high exciton binding energy and lack of a positive oxidation band potential restrict the photocatalytic CO_(2)reduction efficiency of lead-free Bi-based halide perovskites Cs_(3)Bi_(2)X_(9)(X=Br,I).In this study,a sequential growth method is presented to prepare a visible-light-driven(λ>420 nm)Z-scheme heterojunction photocatalyst composed of BiVO_(4)nanocrystals decorated on a Cs_(3)Bi_(2)I_(9)nanosheet for photocatalytic CO_(2)reduction coupled with water *** Cs_(3)Bi_(2)I_(9)/BiVO_(4)Z-scheme heterojunction photocatalyst is stable in the gas-solid photocatalytic CO_(2)reduction system,demonstrating a high visible-light-driven photocatalytic CO_(2)-to-CO production rate of 17.5μmol/(g·h),which is approximately three times that of pristine Cs_(3)Bi_(2)I_(9).The high efficiency of the Cs_(3)Bi_(2)I_(9)/BiVO_(4)heterojunction was attributed to the improved charge separation in Cs_(3)Bi_(2)I_(9).Moreover,the Z-scheme charge-transfer pathway preserves the negative reduction potential of Cs_(3)Bi_(2)I_(9)and the positive oxidation potential of BiVO_()*** study off ers solid evidence of constructing Z-scheme heterojunctions to improve the photocatalytic performance of lead-free halide perovskites and would inspire more ideas for developing leadfree halide perovskite photocatalysts.

关键词： Lead-free halide perovskite Z-scheme heterojunction CO_(2)reduction Visible-light photocatalysis Charge transfer