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EEA - Electrotehnica, Electronica, Automatica 2024年第4期72卷 43-50页

作者： He, Kecheng Dong, Haiying Li, Yuhong Ma, Chao School of New Energy and Power Engineering Lanzhou Jiaotong University Lanzhou730070 China Key Laboratory of Solar Power System Engineering Jiuquan Vocational and Technical College Gansu Jiuquan735000 China

Trunk Mobile charging stations (TMCS) have garnered significant attention domestically and internationally due to their excellent mobility and flexible scheduling capabilities. However, their potential application value has not been fully explored. This paper proposes a two-stage collaborative optimization scheduling strategy for TMCS to coordinate their operation in providing charging services for electric vehicles (EVs) and engaging in energy arbitrage with the power grid. In the day-ahead optimization phase, the growth curve function simulates the future development trend of EVs, and a stochastic optimization method determines the collaborative operation plan of TMCS. In the real-time scheduling phase, the chance-constrained method adjusts and updates the TMCS schedule based on real-time traffic and power operation data, resulting in an optimized TMCS scheduling outcome considering short-term uncertainty. Case analysis shows that the proposed method effectively addresses the impact of long-and short-term uncertainties on the TMCS scheduling plan, ensuring the quality of charging services while guaranteeing the profitability of charging facility operators. © Editura ELECTRA 2024. All rights reserved.

关键词： Charging stations

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Optimal Design of Aperture Illuminations for Microwave power Transmission with Annular Collection Areas

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Engineering 2023年第11期30卷 63-74页

作者： Xun Li Baoyan Duan Yiqun Zhang Yongxin Guo Shaanxi Key Laboratory of Space Solar Power Station System Xidian UniversityXi’an 710071China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore

This work presents an optimal design method of antenna aperture illumination for microwave power transmission with an annular collection *** objective is to maximize the ratio of the power radiated on the annular collection area to the total transmitted *** formulating the aperture amplitude distribution through a summation of a special set of series,the optimal design problem can be reduced to finding the maximum ratio of two real quadratic *** on the theory of matrices,the solution to the formulated optimization problem is to determine the largest characteristic value and its associated characteristic *** meet security requirements,the peak radiation levels outside the receiving area are considered to be extra constraints.A hybrid grey wolf optimizer and Nelder–Mead simplex method is developed to deal with this constrained optimization *** order to demonstrate the effectiveness of the proposed method,numerical experiments on continuous apertures are conducted;then,discrete arrays of isotropic elements are employed to validate the correctness of the optimized ***,patch arrays are adopted to further verify the validity of the proposed method.

关键词： Microwave power transmission Beam collection efficiency Ring-shaped beam Annular collection area Grey wolf optimizer Nelder-Mead simplex method

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Thermal Property Enhancement of a Novel Shape-Stabilized Sodium Acetate Trihydrate-Acetamide/Expanded Graphite-Based Composite Phase Change Material

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Journal of Thermal Science 2024年第4期33卷 1564-1576页

作者： AN Zhoujian HOU Wenjie DU Xiaoze HUANG Zhongzheng MOMBEKI PEA Hamir Johan ZHANG Dong LIU Xiaomin College of Energy and Power Engineering Lanzhou University of TechnologyLanzhou730050China Key Laboratory of Multi-supply System with Solar Energy and Biomass of Gansu Province Lanzhou730050China Gansu Natural Energy Research Institute Lanzhou730046China

Phase change materials(PCMs)are a kind of highly efficient thermal storage materials which have a bright application prospect in many fields such as energy conservation in buildings,waste heat recovery,battery thermal management and so *** inorganic hydrated salt PCMs have received increasing attention from researchers due to their advantages of being inexpensive and ***,inorganic hydrated salt PCMs are still limited by the aspects of inappropriate phase change temperature,liquid phase leakage,large supercooling and severe phase separation in the application *** this work,sodium acetate trihydrate was selected as the basic inorganic PCM,and a novel shape-stabilized composite phase change material(CPCM)with good thermal properties was prepared by adding various functional *** first,the sodium acetate trihydrate-acetamide binary mixture was prepared and the melting point was adjusted using *** the binary mixture was incorporated into expanded graphite to synthesize a novel shape-stabilized *** thermophysical properties of the resultant shape-stabilized CPCM were systematically *** microscopic morphology and chemical structure of the obtained shape-stabilized CPCM were characterized and *** experiment results pointed out that acetamide could effectively lower the melting point of sodium acetate *** obtained shape-stabilized CPCM modified with additional 18%(mass fraction)acetamide and 12%(mass fraction)expanded graphite exhibited good shape stability and thermophysical characteristics:a low supercooling degree of 1.75℃and an appropriate melting temperature of 40.77℃were obtained;the latent heat of 151.64 kJ/kg and thermal conductivity of 1.411 W/(m·K)were also ***,after 50accelerated melting-freezing cycles,the obtained shape-stabilized CPCM represented good thermal reliability.

关键词： sodium acetate trihydrate melting point modification agent expanded graphite shape stability thermal conductivity enhancement

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Distributed power conditioning unit of large-scale space solar power station

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Chinese Journal of Aeronautics 2024年第8期37卷 421-434页

作者： Xintong LI Jianwei MI Yiqun ZHANG Guanheng FAN Jie DU School of Mechano-electronic Engineering Xidian UniversityXi’an 710071China Shaanxi Key Laboratory of Space Solar Power Station System Xidian UniversityXi’an 710071China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China

In this paper,a multi-bus distributed power Conditioning Unit(PCU)is proposed for the Space solar power Station with large scale photovoltaic(PV)array and power levels reaching MW *** this unit,there are multiple independent PV *** each PV array,there are multiple independent PV *** this paper,a V-P droop control method with adaptive droop coefficient is proposed,which modifies the droop intercept based on the bus voltage deviation and the power per unit value of the PV *** method ensures the accuracy of bus voltage and achieves proportional distribution of power between PV arrays based on the proposed topology structure in this *** the load changes or the output power of the PV array fluctuates,this method can ensure that power is distributed *** principle and control method of the proposed droop control method is analyzed in this *** effectiveness of the method is verified through MATLAB/Simulink simulation and *** and experimental results show that the proposed method can achieve power distributed proportionally when load changes and PV output power fluctuates,reduce bus voltage error caused by line impedance and differences in rated power of different PV arrays,and improve the performance of PV power generation system applied to space.

关键词： Space solar power Station Photovoltaics Droop control DC confluence power conditioning unit

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Characteristics of perfluoromethyl vinyl ether:A new eco-friendly alternative gas for SF_(6)

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High Voltage 2024年第3期9卷 509-517页

作者： Song Xiao Yijiang Chen Mingjun Tang Shuangshuang Tian Haoran Xia Yifan Wang Ju Tang Yi Li Xiaoxing Zhang State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityHubeiChina Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System School of Electrical and Electronic EngineeringHubei University of TechnologyWuhanChina

The exploration of eco-friendly insulating gas to substitute the most potent greenhouse gas sulphur hexafluoride(SF6)has consistently garnered significant ***,the au-thors evaluated the feasibility of utilising perfluoromethyl vinyl ether(PMVE,C_(3)F_(6)O)as a new branch of eco-friendly insulating gas for the first *** primary dielectric and stability characteristics of PMVE regarding AC breakdown,partial discharge,dielectric recovery,and decomposition properties were revealed under various gas pressure and electrical field *** was found that PMVE demonstrated superior dielectric strength,with the AC breakdown and PD inception voltage(PDIV)1.10 and 1.14 times that of pure SF_(6).Furthermore,the dielectric strength of PMVE exhibits stability even after undergoing 100 cycles of AC breakdowns,and there is no observable formation of solid precipitation on the electrode *** discharge decomposition of PMVE mainly generates fluorocarbon(CF_(4),C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),etc.)and ***,the exceptional insulation stabilityandno absence of solidprecipitation featuresendow PMVE tobe utilised as a new eco-friendly gas for SF_(6)-free gas-insulated equipment.

关键词： surface dielectric vinyl

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A kinetic study and factor analysis of solar thermochemical membrane reactors for syngas production

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Science China(Technological Sciences) 2025年第1期68卷 203-217页

作者： Jiaxin XING Chao XU Xiangyu SUN Xin XIA Fei JIN Qiongqiong JIANG Jiale GAO Key Laboratory of Power Station Energy Transfer Conversion and System of MOE School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China Department of Chemistry University College LondonLondon WC1H 0AJUK School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

solar thermochemical conversion technologies are promising for effectively utilizing solar energy by capturing the full spectrum of solar *** overcome the challenges of low energy conversion efficiency and intermittency faced by solar thermochemical conversion,these technologies can be effectively integrated with membrane reactor *** the performance of solar thermochemical membrane reactors has been experimentally tested,the chemical reactions and oxygen transport mechanisms during the energy conversion process remain poorly *** study introduces a resistance network model to elucidate the interactions between interfacial reactions and bulk diffusion during simultaneous oxidationreduction reactions on both sides of the *** analyzed the oxygen flux of the membrane reactor under various operating conditions using this model to identify the reaction/transport-limiting side of the overall *** most effective solar membrane reactor configuration utilizes natural gas and CO_(2),facilitating clean conversion of fossil fuels with significant advantages in fuel production and energy *** CH_4 lowers the overall reaction temperature,maintains low oxygen partial pressure on the sweep side,and produces a synthesis gas with a 2:1 H_2/CO molar ***,a sensitivity analysis was used to explore the relationship between overall fuel production performance and operational parameters,highlighting the critical role of this research in enhancing the reaction and transport performance of membrane reactors and advancing the development of solar-driven thermochemical fuel production technologies.

关键词： thermochemistry oxygen-permeable membrane membrane reactor chemical kinetics

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A New Method for the Aging Evaluation of Oil-Paper Insulation Using η-Butanol and Methanol

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CSEE Journal of power and Energy systems 2024年第2期10卷 717-726页

作者： Jianyi Wang Yuanxiang Zhou Jun Liu Zhaowei Wang Song Bai Jiayu Lu Department of High Voltage China Electric Power Research InstituteBeijing 100192China State Key Laboratory of Power Grid Environmental Protection Beijing 100192China Electrical Engineering Department Tsinghua UniversityBeijing 100084China Solar Storage Division of State Key Lab of Power System and Generation Equipment School of Electrical EngineeringXinjiang UniversityUrumqi 830047China State Grid Wuwei Electric Power Supply Company Wuwei 733000China

To improve the accuracy and efficiency of the aging life prediction and assessment of transformer oil-paper insulation,and to make up for the deficiencies of traditional characterizers,such as 2-furfural,carbon monoxide,and carbon dioxide,a method for the simultaneous determination of methanol,ethanol,n−propanol,and η-butanol in oil with a single injection is established by headspace-gas chromatography-mass *** measured results show that the determination limits of the four alcohol characterizers can be controlled to 10μg/kg *** on this method,the change patterns of the above four alcohols with thermal aging time and degree of polymerization are obtained through thermal aging experimental ***,η-propanol,and η-butanol in oil indicate nearly linear correlations with thermal aging time and degree of polymerization,similar to that of *** analyzing 52 sets of measured data of 500 kV EHV transformers in operation,η-butanol is found to have excellent performance,and a new method to evaluate the aging state of oil-paper insulation employing η-butanol and methanol is proposed along with the aging attention value *** measured data of 500 kV EHV transformers in operation indicate that the combination of η-butanol and methanol as the preferred characterizers can effectively compensate for the shortcoming of traditional characterizers in the early stages of aging,and the feasibility of the method is *** possible pathways for the generation of η-butanol by cellulose cleavage during the aging of oil-paper are proposed from the chemical structure of cellulose.

关键词： Aging characterization determination method methanol η-butanol oil-paper insulation 500 kV transformers

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Study on the failure prediction method of urban building materials based on the wavelength variation rule of rare earth ions 7

Study on the failure prediction method of urban building mat...

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7th International Conference on Smart Grid and Smart Cities, ICSGSC 2023

作者： Ma, Chao Li, Yuhong Xu, Shipeng Chen, Weiqian Xu, Jun Li, Yaming Jiuquan Vocational and Technical College Gansu Provincial Key Laboratory of Solar Power System Engineering JiuQuan China

ISBN: (纸本)9798350305913

With the continuous development of smart cities, the failure prediction of urban building structure materials has also become an unignorable part of smart city construction. In this study, Eu3+ was selected as the luminescent center, and Eu3+ was doped into Y3Al5O12 fibers (referred to as (YAG:Eu3+)sf later in the paper) by electrostatic spinning method, which makes this fiber with luminescent performance and stress sensing function. The (YAG:Eu3+)sf reinforced aluminum matrix composites were prepared by vacuum hot press sintering, and the emission spectra of (YAG:Eu3+)sf reinforced aluminum matrix composites were recorded by a continuous spectral response system under tensile stresses, and the structural changes within the composites were characterized using in situ XRD, and the relationship between the emission spectra of composites and the internal stresses of materials was analyzed. The relationship between the emission spectra of composites and the internal stresses of the materials was analyzed and empirical equations were established to provide a new method for the failure prediction of composites © 2023 IEEE.

关键词： Yttrium aluminum garnet

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Effect of Thermal Cycling on the Dielectric Properties of Epoxy Resin 7

Effect of Thermal Cycling on the Dielectric Properties of Ep...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Zhou, Yuanxiang Xu, Jingfan School of Electrical Engineering Xinjiang University Tsinghua University The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment Beijing100084 China School of Electrical Engineering Xinjiang University The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment Urumqi830047 China

ISBN: (纸本)9798350359558

This paper adopts a linear temperature change method to subject epoxy resin to thermal cycling within a temperature range of -40 °C to 70°C at different rates of temperature change (1 °C/min and 10 °C/min), exploring the effects of thermal cycling duration and rate of temperature change on the glass transition temperature and dielectric properties of the epoxy resin. The results indicate that with an increase in cycling duration, both the dielectric constant and dielectric loss of the epoxy resin first decrease and then increase. Moreover, under a temperature change rate of 10 °C/min, this trend shows a smaller decrease in the early stages of cycling and a more significant increase in the later stages. Analysis reveals that thermal cycling promotes dynamic adjustment of internal chain segments in the epoxy resin, resulting in a denser structure and enhanced binding capacity to polar groups, which increases the glass transition temperature and improves the dielectric properties of the epoxy resin in the early stages. However, as the number of cycles increases, molecular chains break under the long-term effects of thermal expansion and contraction, gradually deteriorating the dielectric properties. Furthermore, a faster rate of temperature change prevents the internal chain segments of the epoxy resin from adjusting sufficiently, and the increased stress impact makes the epoxy resin more prone to degradation. © 2024 IEEE.

关键词： Thermal cycling

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Structural design and model fabrication of cable-rib tensioned deployable parabolic cylindrical antenna

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Chinese Journal of Aeronautics 2023年第8期36卷 229-246页

作者： Shunji ZHANG Baoyan DUAN Shuxin ZHANG Nan WANG Shaanxi Key Laboratory of Space Solar Power Station System Xi’an 710071China School of Electromechanical Engineering Xidian UniversityXi’an 710071China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100101 China

Deployable mechanisms with light weight and high storage ratio have received considerable attention for space applications. To meet the requirements of space missions, a parabolic cylindrical deployable antenna based on cable-rib tension structures is proposed and verified by a physical prototype. The parabolic cylindrical antenna adopts simple parallel four-bar mechanisms to construct the basic deployable unit, and the cylindrical direction dimension can be easily extended by modularization, which has obvious advantages in storage ratio and area density. Considering the complexity of the entire antenna structure design, including cable networks and flexible trusses, the form-finding design optimization model of a parabolic cylindrical antenna is established using the force density sensitivity method, and then the kinematics analysis of the deployable mechanism is carried out. Finally, a single-module prototype with a deployable diameter of 4 m × 2 m was designed and fabricated. The results of the ground deployment process test and surface accuracy measurements show that the antenna has good feasibility and practicability.

关键词： Form-finding design Kinematic analysis Mechanism design Paraboliccylindrical antenna Principle prototype

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