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2024 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2024

作者： Bi, KeFan Zhang, Qian Su, Xin Huang, Shengwei Weng, Yifan Chongqing University State Key Laboratory Of Power Transmission Equipment & System Security And New Technology Chongqing China

ISBN: (纸本)9798331529277

With the rapid development of electric vehicles, a low-carbon scheduling strategy for electric vehicles based on node carbon potential calculation has been proposed to reduce the carbon emissions of the system and electric vehicle clusters, alleviate the power supply pressure of the power grid, and achieve peak shaving and valley filling of the total load of the power grid. Firstly, establish an electric vehicle scheduling model using Monte Carlo sampling. Then, by constructing a carbon emission flow model to analyze the carbon emission intensity of grid nodes, time of use electricity prices are formulated based on grid loads, and electric vehicle charging and discharging strategies are obtained through power flow calculation and convex optimization algorithms. Finally, taking the IEEE 14 node distribution network as an example, it is verified that the proposed strategy can effectively reduce charging costs and carbon emission costs. © 2024 IEEE.

关键词： Load flow optimization

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Influence of different anodised nanoporous structures on the anti-icing and electrical properties of transmission Al lines

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High Voltage 2025年第1期10卷 167-177页

作者： Xu Dai Yuan Yuan Jie Xiao Chenghao Jiang Xujiang Hua Huiying Xiang Tao Zhu Guoyong Liu Jiang Zhou Ruijin Liao State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina College of Materials Science and Engineering Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

Ice accumulation of overhead transmission lines can lead to serious damage to power *** nanostructured Al conductors are proposed to replace the de-icing or ice-melting equipment for economic advantages,good anti-icing properties and robust electrical *** under different direct current densities is adopted to fabricate two nanostructures on Al conductors,including the reticular and honeycomb-like nanoporous *** to pure Al conductors,the anodised surface of honeycomb-like nanoporous structures exhibits lower ice adhesion(3.82 kPa)and ice *** conductor steel reinforced treated in the proposed method has also been validated to exhibit a significant anti-glaze icing ***-tionally,corona performance and line loss are experimentally measured and calculated to prove good electrical *** 0.27 A Al strand shows the highest corona inception voltage(27.86 kV)and the lowest AC resistance(4.65Ω/km),which is attributed to the good dielectric property and heat ***,the proposed anti-icing transmission conductors show profound application potential for power systems.

关键词： electrical structures properties

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Non-convexity Pricing and Allocating Costs in Stochastic Electricity Markets

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CSEE Journal of power and Energy systems 2024年第4期10卷 1466-1477页

作者： Wei Lin Zhifang Yang Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China

Stochastic electricity markets have drawn attention due to fast increase of renewable *** results in two issues:one is to reduce uplift payments arising from non-convexity under renewable uncertainties,and the other one is to allocate reserve costs based on renewable *** resolve the first issue,a convex hull pricing method for stochastic electricity markets is *** dual variables of system-wide constraints in a chance-constrained unit commitment model are shown to reduce expected uplift payments,together with developing a linear program to efficiently calculate such *** resolve the second issue,an allocation method is proposed to allocate reserve costs to each renewable power plant by explicitly investigating how renewable uncertainties of each renewable power plant affect reserve *** proposed methods are validated in a 24-period 3-unit test example and a 24-period 48-unit utility example.

关键词： Convex hull pricing cost allocation non-convexity renewable uncertainty stochastic electricity market

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Raman spectroscopy based detection of corrosive sulfur in transformer oil:Method and application

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High Voltage 2022年第6期7卷 1175-1184页

作者： Ziyi Wang Ruimin Song Weigen Chen Xinyuan Zhang Pinyi Wang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

In order to overcome the shortcomings of traditional methods for corrosive sulfur detection in transformer oil,Raman spectroscopy based detection is proposed in this *** widely concerned corrosive sulfur,Dibenzyl Disulfide(DBDS),was chosen as the characteristic molecule to be detected.A series of oil samples with different DBDS concentrations was *** these samples were extracted by 1-methyl-2-pyrrolidinone for DBDS enrichment to improve the sensitivity of *** Raman spectra of samples were obtained,and a linear model was established by analysing the relationship between the characteristic peak and the DBDS *** limit of detection reached 7.98 mg/*** determining the DBDS concentrations causing sulfur corrosion,the sulfur weight content on the copper conductor surface was measured by Scanning Electron Microscope-Energy Dispersive Spectrometer after a corrosion *** results show that the corrosion limitation highly depends on the type of transformer oil,and the Raman spectroscopy detection can meet the limit of detection requirement in practical ***,an on-site oil sample and five Lab-made samples were detected via our new method and the current Gas Chromatography-Mass Spectrometry based *** is found that there is no significant divergence between the measurement *** good applicability was also demonstrated in onsite sample test.

关键词： corrosion sulfur spectroscopy

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Enhanced thermoelectric performance of SmS by Se alloying and Y doping 4

Enhanced thermoelectric performance of SmS by Se alloying an...

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4th International Conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2024

作者： Liao, Huijun Huang, Zhengyong Jian, Li State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400030 China

ISBN: (数字)9781510679887

ISBN: (纸本)9781510679870

Rare-earth sulfide SmS is verified to be a potential high-temperature thermoelectric material. However, the relatively high thermal conductivity limits its performance. Although Se alloying can effectively reduce the thermal conductivity, the bandgap becomes wider at the same time and more carrier concentration is required to optimize the electrical performance. A series Sm1-xYxS0.77Se0.23 (x =0, 0.03, 0.05, 0.07, 0.1) was synthesized by ball-milling combined hot-pressing. X-ray powder results showed all Y-doped samples of Sm1-xYxS0.77Se0.23 contains tiny Sm3S4 phase. When x 0.97Y0.03S0.77Se0.23 reaches 1.42 mW/m K2 at 1023 K. The thermal conductivity of Sm1-xYxS0.77Se0.23 (x © 2024 SPIE.

关键词： Carrier concentration

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Mechanical switches integrated sandwich triboelectric nanogenerator with high instantaneous output power 2

Mechanical switches integrated sandwich triboelectric nanoge...

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2nd International Conference on Frontier Materials, ICFM 2023

作者： Wu, Han Liao, Ruijin Wang, Jiyu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

Triboelectric nanogenerator (TENG) has emerged as a promising energy harvester that converts random mechanical energy in the environment into electricity to enable self-powered system construction. However, the conventional TENG exhibits a large internal resistance resulting in a low output power across external loads for practical application. In this work, the travel mechanical switches were integrated into the TENG to boost output power, where the switches were turned on and off by the periodic motion between the triboelectric layers. Moreover, the triboelectric layers of TENG were developed as contact separation sandwich structures to work with mechanical switches, allowing the device to release the co-accumulated charges from the dual triboelectric layer to yield giant instantaneous discharge. Compared to a conventional TENG, the device offers ∼2.8 times more transfer charge in one cycle and ∼106 times more instantaneous power at an external load of 500 ω, which renders the internal impedance match almost negligible. As a result, the high-power source demonstrates the ability to illuminate the commercial lamps in parallel (total power: 50 W). Such a unique TENG with high output power for low resistance load could greatly enrich the practical application fields of self-powered systems. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Nanogenerators

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Axial and radial electromagnetic-vibration characteristics of converter transformer windings under current harmonics

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High Voltage 2023年第3期8卷 477-491页

作者： Peiyu Jiang Zhanlong Zhang Zijian Dong Yu Yang Zhicheng Pan Jun Deng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingShapingbaChina Maintenance&Test Centre EHVChina Southern Power GridGuangzhouGuangdongChina

The winding current harmonic content of converter transformer in operation is ***,affected by harmonics,the radial vibration characteristics are quite different from the power transformer,structural loosening and deformation caused by winding vibration are more ***,in view of the influence of current harmonics on axial and radial vibrations,this study builds a 3D winding electromagnetic vibration finite element simulation model,analyses the components and contents of current harmonics,compares the leakage flux and vibration distribution under the fundamental,harmonic and superimposed *** correlation relationship between the harmonic components and axial and radial vibration characteristics is obtained,and the vibration measurement test of±800 kV converter transformer in operation is carried out to verify the correctness of the analysis *** results show that the winding radial vibration amplitude will exceed the axial vibration affected by *** importantly,under the superposition of the fundamental,5th and 7th harmonic current,the vibration contribution of the converter transformer tank is mainly radial vibration,and the vibration dominant frequency is shifted from 100 Hz under the fundamental current to 400 Hz.

关键词： winding harmonics harmonic

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Performance Analysis of Corroded Grounding Devices with an Accurate Corrosion Model

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CSEE Journal of power and Energy systems 2023年第3期9卷 1235-1247页

作者： Yihua Dan Zhanlong Zhang Pengfei Gan Huarui Ye Qiaoyi Li Jun Deng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400030China Test Centre of EHV Transmission Company China Southern Power GridGuangzhou 510663China

Grounding devices are significant to the operation of the power transmission line and power *** soil and leakage current can easily cause the corrosion of carbon steel grounding devices,resulting in power ***,most carbon steel grounding devices in service are already corroded,and the accurate calculation of grounding parameters for corroded grounding devices is ***,most existing methods for calculating the grounding parameters of corroded grounding devices usually have the following disadvantages:1)They only consider whether the grounding devices are broken or not,and cannot analyze the grounding parameters of grounding devices with different corrosion degrees;2)They assume that the corroded grounding device is a conductor with a smaller diameter,and ignore the impact of the corrosion product layer,resulting in calculation *** solve the above problems,this paper establishes an accurate corrosion model for grounding devices based on the volume expansion coefficient of corrosion *** grounding parameters calculation method for corroded grounding devices is proposed based on the boundary element method(BEM)and Galerkin’s *** the grounding performance of tower grounding grids with different corrosion degrees in different soils(uniform and layered)is ***,some features of grounding parameters of corroded grounding devices are *** study can accurately calculate the grounding parameters of the corroded grounding devices and has far-reaching engineering significance for the safety of power equipment.

关键词： Corroded grounding devices corrosion product layer grounding parameters volume expansion coefficient

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Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults

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Protection and Control of Modern power systems 2023年第2期8卷 304-320页

作者： Yi Luo Jun Yao Zhaoyang Chen Sen Huang Shiyue Chen Qi Zhang Zhentao Qin State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China State Grid Changzhou Power Supply Company Changzhou 2131261China

The stability of a voltage source converters(VSC)system based on phase-locked loop(PLL)is very important issue during asymmetric grid *** paper establishes a transient synchronous stability model of a dual-sequence PLL-based VSC system during low voltage ride-through by referring to the equivalent rotor swing equation of syn-chronous *** on the model,the synchronization characteristics of the VSC system under asymmetric grid faults are described,and the interaction mechanisms,as well as the transient instability phenomena of positive and negative sequence PLL during asymmetric faults are *** the equal area criterion,the influences of sequence control switching action,detection delay,and interaction between the positive and negative sequence PLL on the transient synchronous stability of the VSC system are analyzed,*** addition,a transient stabil-ity assessment criterion based on the critical fault clearance angle and time and an enhancement control strategy based on the improved positive and negative sequence PLL are ***,the analytical results are validated through simulation and experiments.

关键词： Voltage source converters(VSC) Asymmetric grid faults Dual-sequence PLL Transient synchronous

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Effect of the grain boundary character distribution on the sulfur corrosion behaviour and mechanisms of copper windings under different high temperatures

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High Voltage 2024年第3期9卷 566-580页

作者： Xu Dai Yuan Yuan Jiang Zhou Guoyong Liu Tao Zhu Huiying Xiang Qi Yu Xue Gao Ruijin Liao State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina College of Materials Science and Engineering Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

As a typical failure phenomenon in transformers,sulfur corrosion has garnered significant attention in the field of high-voltage *** boundary character distribution(GBCD)copper windings have been introduced to enhance sulfur corrosion resistance by slowing down intergranular *** this study,the sulfur corrosion behaviour and mechanisms of the GBCD copper windings under various temperatures were experi-mentally and theoretically *** show that GBCD can enhance the corrosion resistance of copper in liquid *** the increase in temperatures,the insulating properties of oil and papers in traditional copper windings experience notable degradation,while GBCD copper windings show more stable insulating *** addition,modelling of grain boundary energy indicates that the grain boundary structure of GBCD copper windings has a lower average interface energy of 0.170 eV/Å***-culations of reaction thermodynamics show that GBCD copper windings possess a higher failure temperature(135.2℃)and inhibition degree(activation energy)of the sulfur corrosion(32,557.62 J/mol),revealing the stability and enhanced sulfur corrosion resis-tance at elevated temperatures.

关键词： corrosion grain copper

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