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Optimal Location and Sizing ofMulti-Resource Distributed Generator Based onMulti-Objective Artificial Bee co.ony Algorithm

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energy engineering 2024年第2期121卷 499-521页

作者： Qiangfei Cao Huilai Wang Zijia Hui Lingyun Chen Eco.omic and Technological Research Institute State Grid Shanxi Electric Power Co.Ltd.Xi’an710075China Central Southern china electric power Design Institute co. Ltd.China Power Engineering Consulting GroupWuhan430074China

Distribution generation(DG)technology based on a variety of renewable energy technologies has developed rapidly.A large number of multi-type DG are co.nected to the distribution network(DN),resulting in a decline in the stability of DN *** is urgent to find a method that can effectively co.nect multi-energy DG to ***(PV),wind power generation(WPG),fuel cell(FC),and micro gas turbine(MGT)are co.sidered in this paper.A multi-objective optimization model was established based on the life cycle co.t(LCC)of DG,voltage quality,voltage fluctuation,system network loss,power deviation of the tie-line,DG pollution emission index,and meteorological index weight of ***-objective artificial bee co.ony algorithm(MOABC)was used to determine the optimal location and capacity of the four kinds of DG access DN,and co.pared with the other three heuristic *** tests based on IEEE 33 test node and IEEE 69 test node show that in IEEE 33 test node,the total voltage deviation,voltage fluctuation,and system network loss of DN decreased by 49.67%,7.47%and 48.12%,respectively,co.pared with that without DG *** the IEEE 69 test node,the total voltage deviation,voltage fluctuation and system network loss of DN in the MOABC co.figuration scheme decreased by 54.98%,35.93%and 75.17%,respectively,co.pared with that without DG co.figuration,indicating that MOABC can reasonably plan the capacity and location of *** the maximum trade-off between DG eco.omy and DN operation stability.

关键词： Distributed generation distribution network life cycle co.t multi-objective artificial bee co.ony algorithm voltage stability

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Numerical Investigation on Characteristics of Supercritical co.(2)Heat Transfer in Vertical Circular Tubes with Circumferentially Half-Side Heating

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Journal of Thermal Science 2024年第5期33卷 1744-1756页

作者： ZHANG Yan ZHANG Xinyi YAN Chenshuai WU Wenhua GAO Erman School of energy and power engineering Northeast Electric Power UniversityJilin 132012China

The design of heat exchangers in the advanced supercritical power co.version system cannot be separated from the study of heat transfer ***-side heating mode is often enco.ntered for solar receiver and supercritical ***,the characteristics of supercritical co.(2)(sco.(2))co.vection heat transfer in vertical tubes with circumferentially half-side heating was numerically investigated through the SST k-ωturbulent model which matches well with the experimental ***,heat transfer between sco.(2)upflow and downflow was *** to film boiling heat transfer at subcritical pressure,numerical results were processed acco.ding to the supercritical pseudo-phase transition hypothesis,with liquid-like phase in the tube co.e region and vapor-like film in the region near the heated tube *** structure of two layers was demarcated by pseudo-critical temperature T_(pc).Therefore,sco.(2)heat transfer was assessed acco.ding to double thermal resistances caused by vapor-like film near the wall and co.e liquid-like *** findings suggest that wall temperature for upflow is higher than that for downflow,which is attributed to larger thermal resistance in the fluid domain for upflow than that for *** difference guarantees the excellent heat transfer performance for downflow than *** is also further co.cluded that the formation of vapor-like film near the wall due to pseudo-phase transition plays a key role in dominating wall temperature and inducing heat transfer deterioration in half-side heating *** present co.tribution is significant to the design of supercritical heat exchanger under half-side heating mode.

关键词： supercritical co.(2) pseudo-phase transition half-side heating thermal resistance flow direction

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Thermodynamic and Eco.omic Analysis of a co.ceptual System co.bining Sludge Gasification,SOFC,Supercritical co.(2)Cycle,and Organic Rankine Cycle

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Journal of Thermal Science 2024年第4期33卷 1491-1508页

作者： LV Jiayang WANG Chizhong CHEN Heng PAN Peiyuan XU Gang ZHANG Guoqiang School of energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China

In order to reduce the environmental impact of co.ventional sludge treatment methods and to utilize the energy in sludge more effectively,a co.pled system based on sewage sludge gasifier(SSG),solid oxide fuel cells(SOFC),supercritical co.(2)cycle(S-co.(2)),and organic Rankine cycle(ORC)is *** clean syngas obtained from sludge gasification is mixed with CH4 and then first utilized by the fuel *** exhaust gas from the fuel cell is fully co.busted in the afterburning chamber and then enters the bottom cycle system co.sisting of S-co.(2)&ORC to generate *** understand the performance of the system,thermodynamic and eco.omic analyses were co.ducted to examine the project's *** thermodynamics as well as the eco.omics of the co.pled system were analyzed to arrive at the following co.clusions,the power production of the system is 37.34 MW;the exergy efficiency is 55.62%,and the net electrical efficiency is 61.48%.The main exergy destruction is the gasifier and SOFC,acco.nting for 62.45%of the total exergy *** takes only6.13 years to repay the co.struction investment in the novel system,and the project obtains a NPV of 17723820USD during 20 years *** above findings indicate that the new co.pled system has a better performance in terms of energy utilization and eco.omy.

关键词： sewage sludge gasifier SOFC supercritical co.(2)cycle organic Rankine cycle multi-system co.pling

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Dynamic Modeling of Key Operating Parameters for Supercritical Circulating Fluidized Bed Units based on Data-Knowledge-Driven Method

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Journal of Thermal Science 2024年第3期33卷 1216-1230页

作者： YU Haoyang GAO Mingming ZHANG Hongfu CHEN Jiyu LIU Jizhen YUE Guangxi The State Key Laboratory of Alternate electrical power System with Renewable energy Sources School of Control and Computer EngineeringNorth China Electric Power UniversityBeijing102206China CHN energy New energy Technology Research Institute co. Ltd.Beijing102209China Department of energy and power engineering Tsinghua UniversityBeijing100084China

To address the pressing need for intelligent and efficient co.trol of circulating fluidized bed(CFB)units,it is crucial to develop a dynamic model for the key operating parameters of supercritical circulating fluidized bed(SCFB)***,data-knowledge-driven dynamic model of bed temperature,load,and main steam pressure of the SCFB unit has been ***,a knowledge-driven method is employed to develop a dynamic model for key operating parameters of SCFB *** model parameters are determined based on the operating data of the unit and co.tinuously optimized in real ***,Bidirectional Long Short-Term Memory co.bined with co.volutional Neural Network and Attention Mechanism is utilized to build the dynamic model of bed temperature,load,and main steam ***,a co.laboration and integration method based on the critic weight method and the variation co.fficient method is proposed to establish data-knowledge-driven model of key operating parameters for SCFB *** model displays great accuracy and fitting ability co.pared with other methods and effectively captures the dynamic characteristics,which can provide a research basis for the design of intelligent flexible co.trol mode of SCFB unit.

关键词： circulating fluidized bed dynamic model data-knowledge-driven method deep learning power plant

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Defect-mode and Fabry-Perot resonance induced multi-band nonreciprocal thermal radiation

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Science china(Technological Sciences) 2024年第8期67卷 2405-2412页

作者： CHEN ZiHe YU ShiLv YUAN Cheng CUI XinYou HU Run School of energy and power engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan Fiberhome Fuhua electric co. Ltd.Wuhan 430074China

Acco.ding to Kirchhoff's radiation law,the spectral-directional absorptivity(α)and spectral-directional emissivity(e)of an object are widely believed to be identical,which places a fundamental limit on photonic energy co.version and *** introduction of Weyl semimetals and magneto-optical(MO)materials into photonic crystals makes it possible to violate Kirchhoff's law,but most existing work only report the unequal absorptivity and emissivity spectra in a single band,which cannot meet the requirements of most practical ***,we introduce a defect layer into the structure co.posed of one-dimensional(1D)magnetophotonic crystal and a metal layer,which realizes dual-band nonreciprocal thermal radiation under a 3-T magnetic field with an incident angle of 60°.The realization of dual-band nonreciprocal radiation is mainly due to the Fabry-Perot(FP)resonance occurring in the defect layer and the excitation of Tamm plasmon,which is proved by calculating the magnetic field *** addition,the effects of incident angle and structural parameters on nonreciprocity are also *** is more,the number of nonreciprocal bands co.ld be further increased by tuning the defect layer *** the defect layer thickness increases to 18.2μm,tri-band nonreciprocal thermal radiation is realized due to the enhanced number of defect modes in the photonic band gap and the FP resonance occurring in the defect ***,the effect of defect location on nonreciprocity is also *** present work provides a new way for the design of multi-band or even broad-band nonreciprocal thermal emitters.

关键词： Kirchhoff's law multi-band nonreciprocal thermal radiation magnetophotonic crystal Tamm plasmon defect layer Fabry-Perot resonance

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Design of highly active and durable oxygen evolution catalyst with intrinsic chlorine inhibition property for seawater electrolysis

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Nano Materials Science 2024年第4期6卷 413-418页

作者： Jieli Chen Xiaodong Shi Suyang Feng Jing Li Xiaohong Gao Xiao Wu Ke Li Anyuan Qi Chenghang You Xinlong Tian School of Marine Science and engineering School of Chemical Engineering and Technology Hainan University National energy group Ledong power Generation co. Ltd

High-efficiency seawater electrolysis is impeded by the low activity and low durability of oxygen evolution catalysts due to the co.plex co.position and co.petitive side reactions in ***,a heterogeneousstructured catalyst is co.structed by depositing NiFe-layered double hydroxides （NiFe-LDH） on the substrate of MXene （V2CTx） modified Ni foam （NF）,and abbreviated as NiFe-LDH/V2CTx/*** demonstrated,owing to the intrinsic negative charge characteristic of V2CTx,chlorine ions are denied entry to the interface between NiFeLDH and V2CTx/NF substrate,thus endowing NiFe-LDH/V2CTx/NF catalyst with high co.rosion resistance and durable stability for 110 h at 500 mA ***,the two-dimensional structure and high electrical co.ductivity of V2CTxcan respectively enlarge the electrochemical active surface area and guarantee fast charge transfer,thereby synergistically promoting the catalytic performance of NiFe-LDH/V2CTx/NF in both deionized water electrolyte (261 m V at 100 m A cm-2) and simulated seawater electrolyte (241 mV at 100 mA cm-2).This work can guide the preparation of oxygen evolution catalysts and accelerate the industrialization of seawater electrolysis.

关键词： NiFe-LDH/V 2 CT x /NF catalyst Oxygen evolution reaction Seawater electrolysis Chlorine inhibition

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Numerical simulation and parameter optimization of co.iolis force scale measurement process based on DEM

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Particuology 2024年第7期90卷 128-139页

作者： Haiting Liu Yong Yang Xiangliang Wang Jiewen Deng Bingbing Wang School of energy and power engineering Northeast Electric Power UniversityJilin132012China CNBM Hefei Mechanical&electrical engineering Technology co.Ltd Hefei230051China

The co.iolis force method is a recently developed and highly regarded direct measurement technique that enables high-precision measurement of bulk *** operational parameters and variations thereof directly influence the measurement accuracy of the *** this study,a measurement co.rection co.fficient is introduced to improve the calculation method for mass flow rate of the *** DEM is employed to simulate the motion of particle groups within the co.iolis force scale under different parameters,and the effects of various structural and operational parameters on the measurement results are *** research findings indicate that a lower rotational speed leads to more stable instantaneous measurement results,although the measurement error is relatively *** the rotational speed exceeds 300 rpm,the measurement error remains within 15%.For materials with a radius of 1–2 mm,the variation range of precision error is approximately 0.4%.Among the structural parameters,the radius of the measurement wheel has the most significant impact on the measurement results,wherein a larger measurement wheel radius co.responds to a smaller measurement *** horizontal angle of the blades follows as the next influential parameter,with a clockwise rotation and a horizontal angle of 30°resulting in a measurement error below 2%.

关键词： Parameter optimization Discrete element method co.iolis force scale Measurement error Numerical simulation

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Cyber-Physical Resilience Enhancement for power Transmission Systems with energy Storage Systems

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CSEE Journal of power and energy Systems 2024年第2期10卷 844-855页

作者： Wenhao Zhang Dongyang Rui Weihong Wang Yang Guo Zhaoxia Jing Wenhu Tang School of electric power engineering South China University of TechnologyGuangzhou 510640China Guangzhou Zhiguang electric co. Ltd and Zhiguang Research Institute(Guangzhou)Co.LtdGuangzhou 510765China

In a power system, when extreme events occur, such as ice storm, large scale blackouts may be unavoidable. Such small probability but high risk events have huge impact on power systems. Most resilience research in power systems only co.siders faults on the physical side, which would lead to overly idealistic results. This paper proposes a two-stage cyber-physical resilience enhancement method co.sidering energy storage (ES) systems. The first stage calculates optimal planning of ES systems, and the seco.d stage assesses resilience and enhancement of ES systems during the disaster. In the proposed model, cyber faults indirectly damage the system by disabling monitoring and co.trol function of co.trol center. As a result, when detection and response process of physical faults are blocked by cyber failures, serious load shedding occurs. Such a cyber-physical co.pling mechanism of fault, response, restoration process is demonstrated in the modified IEEE Reliable Test System-79 (RTS-79). Simulation results show co.pared with the physical-only system, the cyber-physical system has a more accurate but degraded resilient performance. Besides, ES systems setting at proper place effectively enhance resilience of the cyber-physical transmission system with less load Shedding.

关键词： Cyber-physical faults energy storage systems resilience enhancement transmission systems

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Insight into the selective separation of co.(2)from biomass pyrolysis gas over metal-inco.porated nitrogen-doped carbon materials:a first-principles study

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Frontiers of Chemical Science and engineering 2024年第3期18卷 1-12页

作者： Li Zhao Xinru Liu Zihao Ye Bin Hu Haoyu Wang Ji Liu Bing Zhang Qiang Lu National engineering Research Center of New energy power Generation North China Electric Power UniversityBeijing102206China

The co.position of biomass pyrolysis gas is co.plex,and the selective separation of its co.ponents is crucial for its further ***-inco.porated nitrogen-doped materials exhibit enormous potential,whereas the relevant adsorption mechanism is still ***,16 metal-inco.porated nitrogen-doped carbon materials were designed based on the density functional theory calculation,and the adsorption mechanism of pyrolysis gas co.ponents H2,co.co.(2),CH_(4),and C2H6 was *** results indicate that metal-inco.porated nitrogen-doped carbon materials generally have better adsorption effects on co.and co.(2)than on H_(2),CH_(4),and C_(2)H_(6).Transition metal Mo-and alkaline earth metal Mg-and Ca-inco.porated nitrogen-doped carbon materials show the potential to separate co.and co.(2).The mixed adsorption results of co.(2)and co.further indicate that when the co.(2)ratio is significantly higher than that of co.the saturated adsorption of co.(2)will precede that of ***,the three metal-inco.porated nitrogen-doped carbon materials can selectively separate co.(2),and the alkaline earth metal Mg-inco.porated nitrogen-doped carbon material has the best *** study provides theoretical guidance for the design of carbon capture materials and lays the foundation for the efficient utilization of biomass pyrolysis gas.

关键词： co.(2)capture biomass pyrolysis gas selective adsorption carbon materials first-principles

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Sample Generation for Security Region Boundary Identification Based on Topological Features of Historical Operation Data

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Journal of Modern power Systems and Clean energy 2024年第4期12卷 1087-1095页

作者： Xiaokang Wu Wei Xu Feng Xue co.lege of energy and electrical engineering Hohai UniversityNanjingChina NARI group co.poration NanjingChina State Grid electric power Research Institute NanjingChina

Since the scale and uncertainty of the power sys-tem have been rapidly increasing,the co.putation efficiency of co.structing the security region boundary(SRB)has beco.e a prominent *** on the topological features of histori-cal operation data,a sample generation method for SRB identi-fication is proposed to generate evenly distributed samples,which co.er dominant security *** boundary sample pair(BSP)co.posed of a secure sample and an unsecure sam-ple is defined to describe the feature of *** resolution,sampling,and span indices are designed to evaluate the co.er-age degree of existing BSPs on the SRB and generate samples closer to the *** on the feature of flat distribution of BSPs over the SRB,the principal co.ponent analysis(PCA)is adopted to calculate the tangent vectors and normal vectors of ***,the sample distribution can be expanded along the tangent vector and co.rected along the normal vector to co.er different security ***,a sample set is randomly gen-erated based on the IEEE standard example and another new sample set is generated by the proposed *** results in-dicate that the new sample set is closer to the SRB and co.ers different security modes with a small calculation time co.t.

关键词： Clustering analysis principal co.ponent analysis(PCA) sample generation security region boundary(SRB)

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