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Research on Two-stage Voltage and Reactive Power Optimization co.rdinated co.trol Method co.sidering Flexible On-load Tap Changer

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Dianwang Jishu/Power System Technology 2025年第1期49卷 272-283页

作者： Li, Jiaming Huo, Qunhai Yin, Jingyuan Lu, Hao Zhou, Jing Zhu, Meisheng He, Wei Dong, Hongwei Institute of Electrical Engineering Chinese Academy of Sciences Haidian District Beijing 100192 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Shijingshan District Beijing 100049 China Shanghai Jiguang Polytechnic co.lege Baoshan District Shanghai 201901 China three gorges Electric Power co. Ltd. Hubei Province Wuhan 430000 China

With the large-scale integration of distributed photovoltaic (DPV) in the distribution network, voltage exceeding limits and fluctuations are beco.ing increasingly severe. The voltage and reactive power optimization and co.rdination co.trol method co.sidering new power quality management devices needs to be further improved to adapt to the new changes in the power grid. This article co.siders the power quality regulation effect of the new flexible on-load tap changer (OLTC) and proposes a two-stage voltage and reactive power optimization co.rdinated co.trol method. The first stage is the day before hour level scheduling stage. Based on distributed photovoltaic and load prediction data, the active output results of DPV and the switching results of flexible OLTC taps and capacitor banks are obtained through power flow calculation and iterative optimization. The seco.d stage is the minute-level reactive power optimization stage. Based on the first stage, co.sidering the reactive power output characteristics of flexible OLTC and DPV, adjusting the reactive power output of the equipment while co.recting the capacitor bank switching co.bination in the first stage, further reducing the maximum voltage deviation of each node and making the distribution network voltage distribution more reasonable. An IEEE33 node distribution system simulation model is built in the paper. The proposed two-stage voltage and reactive power optimization co.rdination co.trol method co.sidering flexible OLTC can improve the DPV absorption level by 9.29% based on the co.ventional eco.omic optimal goal of 88.07%, while meeting the requirement that the voltage deviation of the entire node is less than 0.1pu During the entire period, the overall eco.omic efficiency improved by 7.8%. The results demonstrate the rationality and effectiveness of the proposed method. © 2025 Power System Technology Press. All rights reserved.

关键词： Quality management

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Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： co.g Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan Han Qifeng Han Yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China co.lege of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix co.posites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been co.sidered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of co.mercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve co.erage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the inco.pletely passivated trap states caused interface reco.bination.A surface reco.struction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power co.version efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation undersco.es the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface reco.bination

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Classification and Visualization of Surrounding Rock Mass Stability Based on Multi-Dimensional Cloud Model

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Energy Engineering 2021年第6期118卷 1799-1810页

作者： Liming Xue Wenlong Shen Zhixue Zheng Jiming Chen Hongtao Liu china University of Mining&Technology(Beijing) Beijing100083China Peking University Beijing100871China china three gorges projects development co. Ltd.Chengdu610041China

The classification of the stability of surrounding rock is an uncertain system with multiple *** Multidimensional Cloud Model provides an advanced solution through the use of an improved model of One-dimensional Cloud *** each index as a one-dimensional attribute,the Multi-dimensional Cloud Model can set the digital characteristics of each index acco.ding to the cloud *** Multi-dimensional cloud generator can calculate the certainty of each grade,and then determine the stability levels of the surrounding rock acco.ding to the principle of maximum *** this model to 5 co.l mine roadway surrounding rock examples and co.paring the results with those of One-dimensional and Two-dimensional Cloud Models,we find that the Multi-dimensional Cloud Model can provide a more accurate *** the classification results of the Multidimensional Cloud Model are difficult to be presented intuitively and visually,we reduce the Multi-dimensional Cloud Model to One-dimensional and Two-dimensional Cloud Models in order to visualize the results achieved by the Multi-dimensional Cloud *** approach provides a more accurate and intuitive method for the classification of the surrounding rock stability,and it can also be applied to other types of classification problems.

关键词： Multi-dimensional cloud model surrounding rock stability uncertain visualization

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Evaluating the success of engineering disturbed slope eco.restoration in the alpine region, southeast Qinghai-Tibet Plateau, china

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Journal of Mountain Science 2021年第11期18卷 2820-2832页

作者： HU Xu-dong GAO Jia-zhen ZHOU Ming-tao SHEN Jian ZHAO Tong-hui Key Laboratory of Geological Hazards on three gorges Reservoir Area China Three Gorges UniversityMinistry of EducationYichang 443002China co.lege of Civil Engineering and Architecture China Three Gorges UniversityYichang 443002China DG Hydropower Branch Huadian Tibetan Energy Co.Ltd.Shannan 856200China Huadian Tibetan Energy co. Ltd.Lhasa 850000China

Slope eco.restoration has always received extensive attention as a positive way to reverse eco.ystem deterioration derived from human interventions.A simplified frameworkis proposed to undertake a quantitative evaluation of the engineering disturbed slope eco.restoration success in the alpine region,southeast Qinghai-Tibet *** Daguhydropower project that disturbsthe local eco.ystem to some certainwas selected as the study *** August 2018,six types of slope(soil,rock,soil-rock,spoil,co.struction site,hardened)were served as the demonstration test for the slope eco.restoration with two years monitoring in the study ***,the topography,erosion,soil quality,and vegetation were selected as assessment indicators of the ***,co.bined with the weighting method and the expert panel,the slope eco.restoration quality index(SERQI)was established and applied in the six *** results suggested that the frost-resistant eco.ogical substrate performed well in alpine region,and the SERQI value is in acco.dance with the actual monitoring level with spoil slope>soil slope>co.struction site slope>soil-rock slope>rock slope>hardened *** proposed framework co.ld support slope eco.restoration practitioners for making a more objective and quantitative evaluation easily for the post-implementation restoration.

关键词： Slope eco.restoration Restoration evaluation Eco.ogical indicator Hydropower station Qinghai-Tibetan Plateau

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Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest china

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Journal of Mountain Science 2018年第2期15卷 364-379页

作者： JIANG Shu WANG Yi-feng TANG Chuan LIU Ke Postdoctoral Research Station China Three Gorges Corporation Beijing 100038 China Wudongde Project co.struction Department China Three Gorges Projects Development Co. Ltd Luquan 651500 China State Key Laboratory of C-eohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

Long-term kinematic research of slow- moving debris slide is rare despite of the widespread global distribution of this kind. This paper presents a study of the kinematics and mechanism of the Jinpingzi debris slide located on the Jinsha river bank in southwest china. This debris slide is known to have a volume of 27×106 ms in active state for at least one century. Field survey and geotechnical investigation were carried out to define the structure of the landslide. The physical and mechanical properties of the landslide materials were obtained by in-situ and laboratory tests. Additionally, surface and subsurface displacements, as well as groundwater level fluctuations, were monitored since 2005. Movement features, especially the response of the landslide movement to rainfall, were analysed. Relationships between resisting forces and driving forces were analysed by using the limit equilibrium method assuming rigid-plastic frictional slip. The results co.firmed a visco.s co.oonent in the long-term co.tinuous movement resulting in the quasioverco.solidated state of the slip zone with higher strength parameters than some other types of slowmoving landslides. Both surface and subsurface displacements showed an advancing pattern by the straight outwardly inclined （rather than gently or reversely inclined） slip zone, which resulted in low resistance to the entire sliding mass. The average surface displacement rate from 2005 to 2016 was estimated to be 0.19-0.87 mm/d. Basal sliding on the silty clay seam acco.nted for most of the deformation with different degrees of internal deformation in different parts. Rainfall was the predominant factor affecting the kinematics of Jinpingzi landslide while the role of groundwater level, though positive, was not significant. The response of the groundwater level to rainfall infiltration was not apparent. Unlike some shallow slow-moving earth flows or mudslides, whose behaviors are directly related to the phreatic groundwater level, th

关键词： Kinematics Slow-moving debris slide Shear strength Rainfall infiltration Visco.sco.ponent

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Shake table experimental study of cable-stayed bridges with two different design strategies of H-shaped towers

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 483-493页

作者： Xu Yan Cui Cunyu Zeng Zeng Zeng Shijie State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China china three gorges Project development co. LtdChengdu 610041China

As one of the main load-carrying co.ponents of cable-stayed bridges,bridge towers are typically required to remain elastic even when subjected to severe ground motions with a 2%-3%probability of exceedance in 50 *** fulfill this special requirement imposed by current seismic design co.es,reinforcement ratios in the bridge towers have to be kept significantly higher than if limited ductility behavior of the tower is *** addition,since the foundation capacity is closely related to the moment and shear capacities of the bridge tower,a large increase in bridge co.struction co.t for elastically designed cable-stayed bridge is *** further investigate the possibility of limited ductility bridge tower design strategies,a new 1/20-scale cable-stayed bridge model with H-shaped bridge towers designed acco.ding to strong strut-weak tower co.umn design was *** shake table experimental results are co.pared with a previous strong tower co.umn-weak strut designed full bridge model.A co.parison of the results show that ductility design with plastic hinges located on tower co.umns,i.e.,strong strut-weak tower co.umn design,is another effective seismic design strategy that results in only small residual displacement at the top of the tower co.umn,even under very severe earthquake excitations.

关键词： cable-stayed bridge shake table experiment limited ductility design H-shaped bridge tower seismic design

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Variation in hydraulic co.ductivity of fractured rocks at a dam foundation during operation

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 351-367页

作者： Yi-Feng Chen Jun Zeng Hongtao Shi Yifan Wang Ran Hu Zhibing Yang Chuang-Bing Zhou State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education Wuhan UniversityWuhan430072China china three gorges projects development co. Ltd.Chengdu610000China

Characterizing the permeability variation in fractured rocks is important in various subsurface applications,but how the permeability evolves in the foundation rocks of high dams during operation remains poorly *** permeability change is co.monly evidenced by a co.tinuous decrease in the amount of discharge(especially for dams on sediment-laden rivers),and can be attributed to fracture clogging and/or hydromechanical *** this study,the permeability evolution of fractured rocks at a high arch dam foundation during operationwas evaluated by inverse modeling based on the field timeseries data of both pore pressure and discharge.A procedure co.bining orthogonal design,transient flow modeling,artificial neural network,and genetic algorithm was adopted to efficiently estimate the hydraulic co.ductivity values in each annual cycle after initial reservoir *** inverse results show that the permeability of the dam foundation rocks follows an exponential decay annually during operation(i.e.K/K0=0.97e^(-0.59t)+0.03),with good agreement between field observations and numerical *** significance of the obtained permeability decay function was manifested by an assessment of the long-term seepage co.trol performance and groundwater flow behaviors at the dam *** proposed formula is also of merit for characterizing the permeability change in riverbed rocks induced by sediment transport and deposition.

关键词： Permeability variation Fractured rock Fracture clogging Seepage co.trol Dam engineering

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Simplified Numerical Models of the Unsteady Tip Leakage Flow in co.pressor

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Journal of Thermal Science 2023年第6期32卷 2386-2399页

作者： SI Changxin WU Zihao LIU Xiaohua School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai200240China china three gorges Investment Management co. Ltd.Shanghai200124China Key Laboratory of Aerodynamic Noise co.trol China Aerodynamics Research and Development CenterMianyang621000China

Tip leakage flow(TLF)in co.pressors,which can cause flow blockage in blade passage and induce efficiency loss,is also a potential threat to the unsteady flow stability of modern *** paper provides an overview of the significance of tip leakage flow research,and introduces relevant previous *** calculating by different methods,large eddy simulation(LES)is demonstrated again as a suitable co.promise between accuracy and co.putational co.t for the unsteady flow *** types of simplified tip leakage flow models using LES are adopted with a focus on the unsteady characteristics of shedding vortices in a cavity *** paper applies these models to study the unsteady tip leakage flow which triggers the onset of aco.stic resonance in a multistage axial *** with the detected aco.stic resonance frequency of 5.22 rotational frequency(RF)in the previous experiment,the co.puted co.bination frequency in the 2-D model is equal to 5.232RF,and the simplified 3-D unsteady tip leakage flow model results in a co.bination frequency of ***,based on the small relative error between model results and experimental results,the simplified numerical models are validated to be sufficiently accurate,and theoretically provide a useful basis for the subsequent research of unsteady tip leakage flow in turbomachinery.

关键词： turbomachinery co.pressor tip leakage flow unsteady flow

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Hierarchical Reduced Graphene Oxide-MnO_(2)@Polypyrrole co.xial Nanotube co.posite Hydrogel as a Potential Adsorbent for Cr(Ⅵ)Removal

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1287-1293页

作者： LIU Ben XU Yaowei TONG Yuxing WANG Ziwei LIU Zhichang YAN Qunshan JI Jiayou GAO Song LI Shaoping china Tobacco.Hubei Industrial co. LtdWuhan 430040China Hubei Xinye Reco.stituted Tobacco.development co. Ltd.Wuhan 430056China Applied Technology Research of Reco.stituted Tobacco.Hubei Province Key Laboratory Wuhan 430040China School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei three gorges Laboratory Yichang 443008China

A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole co.xial nanotube co.posite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treatment of graphene oxide and MnO_(2)@polypyrrole co.xial *** stable co.posite hydrogel with a hierarchical network was co.posed of one-dimensional MnO_(2)@polypyrrole co.xial nanotube and two-dimensional graphene nanosheet and characterized by scanning electron microsco.e,Fourier transform infrared spectrosco.y,X-ray diffraction,Brunauer-Emmett-Teller surface,and X-ray photoelectron spectrosco.y *** co.posite hydrogel can be used as an efficient adsorbent for Cr(Ⅵ)removal due to the synergistic interaction between graphene and MnO_(2)@polypyrrole and the hierarchical structure of the ***,the co.posite hydrogel is easily separated because of its stable monolith,and it is reusable(76.8%of removal ability remaining after five adsorption-desorption cycles).The simple fabrication and co.t-effective separation process together with the excellent absorption performance endow the co.posite hydrogel with great potential for practical wastewater treatment.

关键词： hydrogel polypyrrole MnO_(2) graphene Cr(Ⅵ)removal

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Numerical simulation of spatial distributions of mining-induced stress and fracture fields for three co.l mining layouts

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 907-913页

作者： Shengwei Li Mingzhong Gao Xiaojun Yang Ru Zhang Li Ren Zhaopeng Zhang Guo Li Zetian Zhang Jing Xie State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower Sichuan University State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology MOE Laboratory of Deep Underground Science and Engineering College of Architecture and Environment Sichuan University china three gorges projects development co. Ltd.

In this study, the spatial distributions of stress and fracture fields for three typical underground co.l mining layouts, Le, non-pillar mining （NM）, top-co.l caving mining （TCM） and protective co.l-seam mining （PCM）, are modeled using discrete element software UDEC, The numerical results show that different mining layouts can lead to different mining-induced stress fields, resulting in diverse fracture fields, For the PCM, the mining influenced area in front of the mining faces is the largest, and the stress co.centration factor in front of the mining faces is the lowest, The spatial shapes of the mining-induced fracture fields under NM, TCM and PCM differ, and they are characterized by trapezoidal, triangular and tower shapes, respectively, The fractal dimensions of mining-induced fractures of the three mining layouts decrease in the order of PCM, TCM and NM, It is also shown that the PCM can result in a better gas co.trol effect in co.l mines with high outburst potential, The numerical results are expected to provide a basis for understanding of mining-induced gas seepage fields and provide a reference for high- efficiency co.l mining,

关键词： co.l mining Mining layouts Mining-induced stress field Mining-induced fracture field Numerical simulation

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