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A Two-step Approach to Progressive co.lapse Analysis of Building Structures under Blast Loading

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Journal of Shanghai Jiaotong university(Science) 2009年第4期14卷 393-397页

作者：徐俊祥刘西拉 Department of Civil engineering Shanghai Jiaotong University shandong electric power engineering consulting institute co. Ltd.

Structural co.lapse under blast loads is a very co.plex process. For several decades, the engineering profession has co.sidered some approaches to analyze the essential physics of co.lapse phenomena. Recently, the interest in this topic has risen to an apex since the co.lapse of the World Trade Center towers. A two-step analysis approach to capture the characteristics of structural co.lapse during explosions is proposed. A numerical example is presented to illustrate the performance of the presented approach.

关键词： explosion progressive co.lapse damage reinforced co.crete structural robustness

A Wind power Prediction Framework for Distributed power Grids

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Energy engineering 2024年第5期121卷 1291-1307页

作者： Bin Chen Ziyang Li Shipeng Li Qingzhou Zhao Xingdou Liu power Grid Design institute Shandong Electric Power Engineering Consulting Institute Co.Ltd.Jinan250013China School of electrical engineering Shandong UniversityJinan250012China

To reduce carbon emissions,clean energy is being integrated into the power *** power is co.nected to the grid in a distributed form,but its high variability poses a challenge to grid *** article co.bines wind turbine monitoring data with numerical weather prediction(NWP)data to create a suitable wind power prediction framework for distributed ***,high-precision NWP of the turbine range is achieved using weather research and forecasting models(WRF),and Kriging interpolation locates predicted meteorological data at the turbine ***,a preliminary predicted power series is obtained based on the fan’s wind speed-power co.version curve,and historical power is reco.structed using variational mode deco.position(VMD)filtering to form input variables in chronological ***,input variables of a single turbine enter the temporal co.volutional network(TCN)to co.plete initial feature extraction,and then integrate the outputs of all TCN layers using Long Short Term Memory Networks(LSTM)to obtain power prediction sequences for all turbine *** proposed method was tested on a wind farm co.nected to a distributed power grid,and the results showed it to be superior to existing typical methods.

关键词： Wind power prediction distributed power grid WRF mode deep learning variational mode deco.position

co.ductor Arrangement and Phase Sequence Optimization Scheme for 500 kV Four-Circuit Transmission Lines on Same Tower

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Energy engineering 2023年第10期120卷 2287-2306页

作者： Deng Lu Xujun Lang Bo Yang Ziyang Li Hang Geng power Grid Design and Research institute Shandong Electric Power Engineering Consulting Institute Co.Ltd.Jinan250012China School of electrical engineering Shandong UniversityJinan250061China

The four-circuit parallel line on the same tower effectively solves the problems faced by the line reco.struction and co.struction under the co.dition of the increasing shortage of transmission *** the co.ductor and phase sequence arrangement of multiple transmission lines is co.ducive to improving electromagnetic and electrostatic co.pling caused by electromagnetic *** paper uses the ATP-EMTP simulation software to build a 500 kV multi-circuit transmission line on the same *** stimulates the induced voltage and current values of different line lengths,tower spacing,vertical and horizontal spacing between different circuits,phase sequence arrangement,and nominal tower ***,use the BP neural network optimized by a genetic algorithm to predict the induced voltage and current under the unknown co.ductor and phase sequence ***,based on multi-objective particle swarm algorithm to co.struct the optimization model of co.ductor arrangement scheme of overhead transmission line,co.bined with electromagnetic environment co.trol index,determine the optimal co.ductor arrangement scheme by the size of particle fitness function,a significant reduction in induced voltages and currents between transmission lines and the four-circuit co.ductor layout scheme meeting the requirements of the electromagnetic environment is obtained,which provides a reference for the tower design of the transmission station project.

关键词： Spatial arrangement phase sequence arrangement genetic algorithm BP neural network multi-objective particle swarm algorithm

Vibration and noise mechanism of a 110 kV transformer under DC bias based on finite element method

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Global Energy Interco.nection 2024年第4期7卷 503-512页

作者： Ziyang Li Xujun Lang Bo Yang Xiaolin Liu Hao Wang Zhang Li shandong electric power engineering consulting institute co. Ltd.Jinan 250013P.R.China School of electrical engineering Shandong UniversityJinan 250061P.R.China

Global energy and environmental issues are beco.ing increasingly problematic,and the vibration and noise problem of 110 kV transformers,which are the most widely distributed,have attracted widespread attention from both inside and outside the *** bias is one of the main co.tributing factors to vibration noise during the normal operation of *** clarify the vibration and noise mechanism of a 110 kV transformer under a DC bias,a multi-field co.pling model of a 110 kV transformer was established using the finite element *** electromagnetic,vibration,and noise characteristics during the DC bias process were co.pared and quantified through field circuit co.pling in parallel with the power frequency of AC,harmonic,and DC power *** was found that a DC bias can cause significant distortions in the magnetic flux density,force,and displacement distributions of the co.e and *** co.tributions of the DC bias effect to the co.e and winding are different at Kdc=*** this point,the co.e approached saturation,and the increase in the co.e force and displacement ***,the saturation of the co.e increased the leakage flux,and the stress and displacement of the winding increased *** sound field distribution characteristics of the 110 kV transformer under a DC bias are related to the force *** the DC bias co.fficient was 1.25,the noise sound pressure level reached 73.6 dB.

关键词： Transformer DC bias Vibration Noise

Exergy Analysis and Thermal Optimization of a Double-Turbine Regeneration System in a Ultra-Supercritical Double-Reheat Unit

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Fluid Dynamics & Materials Processing 2021年第1期17卷 71-80页

作者： Shidan Chi Tao Luan Yan Liang Xundong Hu Yan Gao School of Energy and power engineering Shandong UniversityJinan250061China shandong electric power engineering consulting institute co. Ltd.Jinan250061China School of Thermal engineering Shandong Jianzhu UniversityJinan250061China

Improving the primary steam parameters is one of the most direct ways to improve the cycle efficiency of a powergeneration system. In the present study, the typical problem co.nected to the excessively high superheat degree ofextraction steam in an ultra-supercritical (USC) double-reheat unit is co.sidered. Using a 1000 MW power plantas an example, two systems (case 1 and case 2) are proposed, both working in co.bination with a regenerativesteam turbine. The thermal performances of these two systems are co.pared with that of the original systemthrough a heat balance method and an exergy balance strategy. The results reveal that the two co.pled systemscan significantly reduce the superheat degree of extraction steam, turbine heat rate, and co.l co.sumption of theunit and improve the energy utilization efficiency. These results will provide useful theoretical guidance to futureinvestigators wishing to address the general problem relating to energy co.servation and modelling of the co.pledextraction steam regenerative system of USC double-reheat units.

关键词： Ultra-supercritical unit exergy loss thermal performance regenerative steam turbine superheat degree

Research on prediction model of formation temperature of ammonium bisulfate in air preheater of co.l-fired power plant

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Chinese Journal of Chemical engineering 2022年第8期35卷 202-210页

作者： Kai Zhang Fangming Xue Zhiqiang Wang Xingxing Cheng School of Energy and power engineering Shandong UniversityJinan 250061China Huadian electric power Research institute co. Ltd.Hangzhou 310030China

Ammonium bisulfate(ABS)is a visco.s co.pound produced by the escape NH_(3) in the NO reduction process and SO_(3) in the flue gas at a certain temperature,which can cause the ash co.rosion of the air preheater in co.l-fired power ***,it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air *** this paper,the SO_(3) reaction kinetic model is used to analyze the SO_(3) generation process from co.l co.bustion to the selective catalytic reduction(SCR)exit stage,and the kinetic model of NO reduction is used to analyze the NH_(3) escape process.A prediction model for calculating the ABS formation temperature based on the S co.tent in co.l and NO reduction parameters of the SCR is proposed,solving the difficulty of measuring SO_(3) co.centration and NH_(3) co.centration in the previous calculation equation of ABS formation *** the reliability of the model is verified by the actual data of the power *** the influence of S co.tent in co.l,NH_(3)/NO_(x) molar ratio,different NO_(x) co.centrations at SCR inlet,and NO removal efficiency on the formation temperature of ABS are analyzed.

关键词： Air preheater Ammonium bisulfate ABS formation temperature Reaction kinetics

Performance analysis of gas-liquid cylindrical cyclone (GLCC) separator with an inclined and perforated wall

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Nuclear Science and Techniques 2013年第1期24卷 53-64页

作者： HUANG Shanfang WEN Yiqian WANG Dong Department of engineering Physics Tsinghua University shandong electric power engineering consulting institute co.p. Ltd School of Energy and power engineering Xi'an Jiaotong University

As primary separators in pressurized water reactors (PWRs), cyclone separators separate most of the water from vapor-water two-phase mixture, which is important to the safety and eco.omics of nuclear power plants. To improve the performance of cyclone separators, we tested new structures in this study, e.g. porosity and inclined angle of the separator wall. Under different structures, separation efficiency and pressure drop were studied theoretically and experimentally. Results show that each of the structural parameters has an effect on separator performance, but none of the trends is monotonically in experimental ranges. Besides separator structures, the co.prehensive performance is also determined by flow patterns. From segregated to homogeneous flow, the separation ability decreases. The separation efficiency is about 5% higher at 20° inclined angle when the superficial velocities are 0.012 and 16 m·s-1 for the liquid and gas, respectively. The separation efficiency is only 91% without an impeller, while it is up to 100% at the same superficial velocities of air and water, 16 and 0.015 m·s-1 , respectively. Based on the study, it is promising to understand deeply the separation mechanism and further to provide data for designing large-scaled separators for advanced pressurized water reactors.

关键词：旋风分离器性能分析旋流器圆筒形先进压水堆孔壁分离效率结构参数

Photon co.nting technique as a potential tool in micro-defect detection of epoxy insulation pull rod in gas-insulated switchgears

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High Voltage 2024年第2期9卷 267-274页

作者： Xianhao Fan Shu Niu Hanhua Luo Jizhong Liang Fang Liu Wenqiang Li Weidong Liu Wensheng Gao Yulong Huang Chuanyang Li Jinliang He School of electrical engineering Tsinghua UniversityBeijingChina electric power Research institute Shangxi Power Grid CorporationTaiyuanShanxiChina shandong Taikai electrical Insulation co. Ltd.TaianShandongChina

The micro-defects in epoxy-based insulation materials generate a local high electric field which results in co.tinuous degradation,seriously endangering the insulation system of gas-insulated switchgears.A highly sensitive detection technique is reported for micro-defects of insulation pull rods based on the photon co.nting(PC)*** re-sults demonstrated that for an epoxy-based insulation pull rod,the photons released during electroluminescence and ionisation at 2 kV,which is less than the partial discharge inception voltage,can be clearly *** findings presented a strong co.relation between photon co.nts and defect *** has been co.ducted to elucidate the mechanism behind defect-induced PC,employing the amplification of ionising luminescence through electric field distortion induced by micro defects and the augmentation of electroluminescence through the aggregation of trap *** this regard,the authors verified that PC can serve as a potential tool in the detection of micro-insulation defects,which also has huge potential in online insulation co.dition monitoring.

关键词： technique. insulation defect

Prime Mover Capacity Optimization and Thermodynamic Performance Analysis of Internal co.bustion Engine Based CCHP System

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Journal of Thermal Science 2023年第4期32卷 1583-1594页

作者： WANG Shucheng MUHAMMAD Imran LI Hongwei CHEN Xiaoxu QIN Mei School of Energy and power engineering Northeast Electric Power UniversityJilin132012China co.lege of engineering and Physical Sciences MechanicalBiomedical and Design EngineeringAston UniversityBirminghamB47ETUK Northeast electric power Design institute co. Ltd.of China Power Engineering Consulting GroupChangchun130021China

In this research,a solar hybrid co.bined co.ling heating and power(CCHP)system is proposed co.sidering the different scenarios of Prime Movers(PMs)and the part-load performance of PMs is validated by the designed values from the manufacturer of ***,a multi-optimization model based on a genetic algorithm is developed in order to select both the most promising performance PM and the most co.t-effectiveness,environmentally friendly number of co.lectors for the proposed CCHP system,*** the hourly performance of this solar hybrid CCHP is determined through a case study of a hotel in *** show that the highest efficiency of the PM with larger capacity has the most promising performance and the co.lector number of 90 turns out to be a superior value for the hotel building based on the primary energy saving ratio of 61.61%.Moreover,on a typical summer day,the reco.ered waste heat and the solar energy can provide all the thermal energy demands,while,an auxiliary boiler should be started to fulfill the energy gap in both typical transition and winter *** the simulation result,the co.(2) emissions can be reduced by 856.2 t/a due to the solar energy introduced into the ***,the dynamic investment payback period will change from 3.01 years to 3.56 years when the fuel price(P_(fuel))ranges from 0.8P_(fuel) to1.2P_(fuel).

关键词： co.bined co.ling heating and power(CCHP)system distributed energy system optimization waste heat reco.ery ICE