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Operation Risk Analysis of Electric Vehicle With Ultra-fast Charging Integrated to Distribution Network Considering the Bearing Capacity of Power System

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Dianwang Jishu/Power System Technology 2025年第1期49卷 187-197页

作者： Xu, Yanchun Li, Sijia Zhang, Tao Mi, Lu Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station China Three Gorges University Hubei Province Yichang 443002 China Department of Electrical and Computer Engineering Texas A & M University TX 77840 United States

At present, the access of distributed generation and electric vehicles with ultra-fast charging to the distribution network will increase the operational risk of the system. Aiming at the problem that the existing risk assessment indicators fail to consider the system capacity effectively, this paper proposed a comprehensive index of risk assessment of distribution networks considering the power system's capacity. The distributed generation output model and the electric vehicle load model with ultra-fast charging were first constructed. Then, the index based on the distribution entropy theory was used to measure the risk caused by the over-limit of state variables such as voltage and power and the uncertainty of their distribution. The index based on the Theil entropy theory was introduced to measure the risk caused by the equilibrium degree of the incremental distribution of state variables after the load impacted the system. The weight analysis method combining the order relationship method and the objective weighting method was used to evaluate the system risk comprehensively. Finally, the rationality of the comprehensive index was calculated and analyzed by testing the IEEE 33-node system. The results show that the comprehensive index proposed can effectively evaluate the potential risk when the system does not exceed the limit and consider that the ultra-fast charging of electric vehicles will change the time series distribution characteristics of comprehensive risk. The research in this paper can provide theoretical guidance for the safe operation of electric vehicles. with ultra-fast charging connected to the distribution network. © 2025 Power System Technology Press. All rights reserved.

关键词： Risk analysis

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Fast Uncertainty Quantification of Electromechanical Oscillation Frequency on Varying Generator Damping

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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 2043-2048页

作者： Yongli Zhu Chanan Singh Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX77840USA

This letter develops a fast analytical method for uncertainty quantification of electromechanical oscillation frequency due to varying generator dampings. By employing the techniques of matrix determinant reduction, two types of uncertainty analysis are investigated to quantify the impact of the generator damping on electromechanical oscillation frequency, i.e., interval analysis and probabilistic analysis. The proposed analytical frequency estimation formula is verified against conventional methods on two transmission system models. Then, Monte Carlo experiments and interval analysis are respectively conducted to verify the established lower/upper bound formulae and probability distribution formulae. Results demonstrate the accuracy and speed of the proposed method.

关键词： Electromechanical oscillation interval analysis Monte Carlo simulation quadratic eigenvalue problem uncertainty quantification

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Ethylene-inhibiting compound 1-MCP delays leaf senescence in cotton plants under abiotic stress conditions

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Journal of Integrative Agriculture 2015年第7期14卷 1321-1331页

作者： CHEN Yuan J T Cothren CHEN De-hua Amir M H Ibrahim Leonardo Lombardini Department of Soil and Crop Sciences Texas A&M University College Station 77840USA Jiangsu Provincial Key Laboratory of Crops Genetics and Physiology Yangzhou University Department of Horticultural Sciences Texas A&M University College Station 77840USA

Cotton （Gossypium hirsutum L.） plants produce more ethylene when subjected to abiotic stresses, such as high temperatures and drought, which result in premature leaf senescence, reduced photosynthetic efficiency, and thus decreased yield. This study was conducted to test the hypothesis that the ethylene-inhibiting compound 1-methylcyclopropene （I-MCP） treatment of cotton plants can delay leaf senescence under high temperature, drought, and the aging process in controlled environ- mental conditions. Potted cotton plants were exposed to 1-MCP treatment at the early square stage of development. The protective effect of 1-MCP against membrane damage was found on older compared to younger leaves, indicating 1-MCP could lower the stress level caused by aging. Application of 1-MCP resulted in reduction of lipid peroxidation, membrane leakage, soluble sugar content, and increased chlorophyll content, in contrast to the untreated plants under heat stress, suggesting that 1-MCP treatment of cotton plants may also have the potential to reduce the effect of heat stress in terms of delayed senescence. Application of 1-MCP caused reductions of lipid peroxidation, membrane leakage, and soluble sugar content, together with increases in water use efficiency （WUE）, water potential, chlorophyll content, and fluorescence quantum efficiency, compared to the untreated plants under drought, suggesting that 1-MCP treatment of cotton plants may also have the ability to reduce the level of stress under drought conditions. In conclusion, 1-MCP treatment of cotton should have the potential to delay senescence under heat and drought stress, and the aging process. Additionally, 1-MCP is more effective under stress than under non-stress conditions.

关键词： 1-MCP ethylene membrane leakage lipid peroxidation chlorophyll fluorescence total soluble sugar

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Experimental and Numerical Study of Penguin Mode Flapping Foil Propulsion System for Ships

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Journal of Bionic Engineering 2017年第4期14卷 770-780页

作者： Naga Praveen Babu Mannam Parameswaran Krishnankutty Harikrishnan Vijayakumaran Richards Chizhuthanickel Sunny Ocean Engineering Indian Institute of Technology Madras Chennai 600036 India Texas A&M University College Station TX 77840 USA

The use of biomimetic tandem flapping foils for ships and underwater vehicles is considered as a unique and interesting concept in the area of marine propulsion. The flapping wings can be used as a thrust producing, stabilizer and control devices which has both propulsion and maneuvering applications for marine vehicles. In the present study, the hydrodynamic per- formance of a pair of flexible flapping foils resembling penguin flippers is studied. A ship model of 3 m in length is fitted with a pair of counter flapping foils at its bottom mid-ship region. Model tests are carried out in a towing tank to estimate the propulsive performance of flapping foils in bollard and self propulsion modes. The same tests are performed in a numerical environment using a Computational Fluid Dynamics （CFD） software. The numerical and experimental results show reasonably good agreement in both bollard pull and self propulsion trials. The numerical studies are carried out on flexible flapping hydrofoil in unsteady conditions using moving unstructured grids. The efficiency and force coefficients of the flexible flapping foils are determined and presented as a function of Strouhal number.

关键词： biomimetic propulsion flapping foil penguin locomotion Strouhal number tandem arrangement thrust coefficient

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Thermally enhanced shale gas recovery: microstructure characteristics of combusted shale

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Petroleum Science 2020年第4期17卷 1056-1066页

作者： Yuan-Hao Cao Wei Chen Teng-Xi Wang Yin-Nan Yuan School of Energy Soochow UniversitySuzhou 215006JiangsuChina Department of Mechanical Engineering Texas A&M UniversityCollege Station 77840USA

Recently,thermal recovery technologies such as combustion have been studied for shale gas ***,understanding of the microstructure of combusted shale is essential for evaluating the effects of thermal treatment on shale gas transport *** this study,the effect of combustion on shale microstructure changes was ***,different-sized shale samples were combusted at 450℃ for 30 ***,shale microstructure properties including surface topographies,porosity and permeability of the raw and combusted shale samples were measured and *** was found that the pore volume and specific surface area increased after combustion,especially for small pulverized *** to surface topography obtained from atomic force microscope,more rough surfaces were obtained for the combusted shale due to larger pores and generation of thermal fractures caused by the removal of organic *** on the mercury intrusion porosimetry measurements,the porosity of the shale samples increased from 2.79% to 5.32% after *** addition,the permeability was greatly improved from 0.0019 to 0.6759 mD,with the effective tortuosity decreased from 1075.40 *** a result,combustion treatment can significantly improve the gas transport capacity.

关键词： Shale Combustion Microstructure Porosity Permeability Particle size

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Topography and human disturbances are major controlling factors in treeline pattern at Barun and Manang area in the Nepal Himalaya

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Journal of Mountain Science 2017年第1期14卷 119-127页

作者： Parveen K.CHHETRI Krishna B.SHRESTHA David M.CAIRNS Department of Geography Texas A&M University College Station TX 77840 USA UiB Global Jekteviksbakken 31 PO Box 7800 5020 Bergen Norway

The alpine treeline ecotone is an important component of mountain ecosystems of the Nepal Himalaya; it plays a vital role in the livelihood of indigenous people,and provides ecosystem services. However,the region faces a problem of paucity of data on treeline characteristics at the regional and landscape scales. Therefore,we used Remote Sensing(RS),and Geographic Information Science(GIS) approaches to investigate cross-scale interactions in the treeline ecotone. Additionally,European Space Agency land cover map,International Center for Integrated Mountain Development(ICIMOD) land cover map,ecological map of Nepal,and United States Geological Survey Shuttle Radar Topography Mission-Digital Elevation Model were used to analyze treeline pattern at the regional scale. Digital Globe high-resolution satellite imagery of Barun(eastern Nepal) and Manang(central Nepal) were used to study treeline patterns at the landscape scale. Treeline elevation ranges from 3300-4300 m above sea level. Abies spectabilis,Betula utilis,and Pinus wallichiana are the main treeline-forming species in the Nepal Himalaya. There is an east to west treeline elevationgradient at the regional scale. No slope exposure is observed at the regional scale; however,at the landscape scale,slope exposure is present only in a disturbed area(Manang). Topography and human disturbance are the main treeline controlling factor in Barun and Manang respectively.

关键词： Alpine Treeline Mountain ecosystem Himalaya Remote Sensing(RS) Geographic Information Science(GIS)

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Modeling mechanistic responses in asphalt pavements under three-dimensional tire-pavement contact pressure

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Journal of Central South University 2011年第1期18卷 250-258页

作者：胡小弟 L.F.WALUBITA Texas Transportation Institute Texas A&M University SystemCollege StationTexas 77840-3135USA Transportation Research Center Wuhan Institute of TechnologyWuhan 430073China

A three dimensional finite element program incorporating actually measured vertical tire-pavement contact pressure(TPCP) was utilized for modeling the mechanistic responses in asphalt concrete(AC) layers by simulating various vehicle motions:stationary and non-stationary(*** acceleration or deceleration mode).Analysis of the results indicated the following items.1) It is critical to use the vertical TPCP as the design control criteria for the tensile strains at the bottom of the AC layer when the base layer modulus is lower in magnitude(e.g.≤400 MPa);however,when the base layer modulus is higher in magnitude(e.g.≥7 000 MPa),the horizontal TPCP and the tensile strains in the X-direction at the surface of the AC layer should also be considered as part of the design response criteria.2) The definition of "overload" needs to be revised to include tire pressure over-inflation,i.e.,a vehicle should be considered to be overloaded if the wheel load exceeds the specification and/or the tire inflation pressure is higher than the specification.3) Light trucks have more structural impact on the strain responses and pavement design when the thickness of the surfacing AC layer is thinner(e.g.≤50 mm).4) The acceleration of a vehicle does not significantly impact the AC surface distresses such as rutting at the top of the upgrade slopes or intersections;however,vehicle deceleration can dramatically induce horizontal shear strains and consequently,aggravate shoving and rutting problems at the highway ***,these factors should be taken into account during mechanistic stress-strain modeling and structural design of asphalt pavements.

关键词： asphalt pavement tire-pavement contact pressure vehicle acceleration mechanistic response three-dimensional finiteelement

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Periodic orbits in the Chermnykh problem

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Astrodynamics 2017年第1期1卷 41-55页

作者： Xiangyuan Zeng Kyle T.Alfriend School of Automation Beijing Institute of TechnologyBeijing 100081China Department of Aerospace Engineering Texas A&M UniversityCollege StationTexas 77840USA

Periodic orbits in irregular gravitational fields are significant for an understanding of dynamical behaviors around asteroids as well as the engineering aspect for deep space explorations. The rotating mass dipole, referred to as the Chermnykh problem, is a good alternative model to study qualitative dynamical environments near elongated asteroids, like the asteroid 1620 Geographos, 216 Kleopatra, or 25143 Itokawa. In this paper a global searching method is adopted to search for periodic orbits around the dipole model based on the concept of Poincaré section of surface. Representative families of periodic orbits are illustrated with respect to all three topological cases of the dipole model. Topological transitions of orbits during iso-energetic continuations are also presented as well as identification of new types of periodic orbits.

关键词： periodic orbits the Chermnykh problem topological transition iso-energetic continuation

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Synthetic PMU Data Creation Based on Generative Adversarial Network Under Time-varying Load Conditions

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 234-242页

作者： Xiangtian Zheng Andrea Pinceti Lalitha Sankar Le Xie Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77840USA Dominion Energy RichmondVA 23219USA School of Electrical Computerand Energy EngineeringArizona State UniversityTempeAZ 85281USA IEEE

In this study,a machine learning based method is proposed for creating synthetic eventful phasor measurement unit(PMU)data under time-varying load *** proposed method leverages generative adversarial networks to create quasi-steady states for the power system under slowly-varying load conditions and incorporates a framework of neural ordinary differential equations(ODEs)to capture the transient behaviors of the system during voltage oscillation events.A numerical example of a large power grid suggests that this method can create realistic synthetic eventful PMU voltage measurements based on the associated real PMU data without any knowledge of the underlying nonlinear dynamic *** results demonstrate that the synthetic voltage measurements have the key characteristics of real system behavior on distinct time scales.

关键词： TermsPhasor measurement unit(PMU) generative adversarial networks neural ordinary differential equations data-driven method

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Experimental studies on curling development of artificial soils

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第6期11卷 1264-1273页

作者： Duaa Al-Jeznawi Marcelo Sanchez Abbas J.Al-Taie Marcin Zielinski Texas A&M University College StationTX77840-77845USA Department of Civil Engineering Al-Nahrain UniversityBaghdadIraq Department of Civil and Environmental Engineering University of StrathclydeScotlandG11XQUK

Soil curling is an important phenomenon associated with volume changes induced by increasing soil suction upon *** study of soil behaviors associated with drying in soils(*** shrinkage,desiccation cracks and curling)has received increasing attention over the last few years,which has been mainly driven by the forecast climate change that will warm up our *** are significant gaps in the current knowledge related to the factors that control the development of curling deformations in *** this,the curling phenomenon is investigated through laboratory desiccation tests on different mixtures of artificial *** effects of soil grain size distribution,mineralogy,soil microstructure,and soil water content on the curling deformation are *** photos were taken at regular time intervals during the tests to understand the volume changes in the soil samples during *** is found that soil fabric and soil water content have significant effects on curling *** is observed that the percentage of sand particles and the initial water content play a critical role in the development of soil *** of pure clayey minerals experienced shrinkage without or with minor curling during drying.

关键词： Curling Shrinkage Desiccation cracking Sedimentation Suction Thin soil layers

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