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Articles 151021 - 151050 of 1733236

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Multi‑Data Prediction Method Based On Gra/Eemd‑Informer Hybrid Model For Photovoltaic‑Storage‑Direct‑Flexible Distribution System, Bingzheng Wang, Yuntao Yue, Binghua Li, Shanshan Wan Jul 2024

Multi‑Data Prediction Method Based On Gra/Eemd‑Informer Hybrid Model For Photovoltaic‑Storage‑Direct‑Flexible Distribution System, Bingzheng Wang, Yuntao Yue, Binghua Li, Shanshan Wan

Journal of Electric Power Science and Technology

Addressing the issue of low accuracy in predicting short-term power generation and consumption data for the photovoltaic-storage-direct-flexible distribution system using existing time series models, a multi-data prediction model based on grey relation analysis (GRA), ensemble empirical mode decomposition (EEMD), and Informer, namely the GRA/EEMD-Informer is proposed. This model effectively captures the precise long-range correlation coupling between outputs and inputs through grey relation analysis, modal decomposition, combined with a self-attention distillation mechanism. It reduces spatiotemporal complexity and significantly alleviates the limitations of traditional encoding and decoding methods. Using data from a photovoltaic power station, the electricity consumption of typical office building, …

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A Day‑Ahead Optimal Scheduling Strategy For Distribution Networks With Spatiotemporal Flexibility Support Of Multi‑Type Energy Storage Systems, Yanchang Zhang, Miaofeng Xu, Gaoming Hu, Yudong Xu, Jiali Zhao Jul 2024

A Day‑Ahead Optimal Scheduling Strategy For Distribution Networks With Spatiotemporal Flexibility Support Of Multi‑Type Energy Storage Systems, Yanchang Zhang, Miaofeng Xu, Gaoming Hu, Yudong Xu, Jiali Zhao

Journal of Electric Power Science and Technology

The access of large-scale distributed resources makes the regulation and control of the distribution grid more difficult, and how to reasonably and effectively utilize diversified resources to reduce the operating cost of the distribution grid has become a key technical problem to be solved. Considering the complementary characteristics of removable energy storage systems and electric vehicles, a day-ahead optimal scheduling strategy for distribution grids with the support of temporal and spatial flexibility of multiple types of energy storage systems is proposed to improve the operating economy of the distribution grid system. Firstly, the scheduling models of electric vehicles and removable …

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Effects Of Flipped Explicit Reading Instruction On College Efl Trainees’ Reading Comprehension Proficiency, Getu Dagne Yalew, Abiy Yigzaw Filate Jul 2024

Effects Of Flipped Explicit Reading Instruction On College Efl Trainees’ Reading Comprehension Proficiency, Getu Dagne Yalew, Abiy Yigzaw Filate

Journal of Educational Technology Development and Exchange (JETDE)

The flipped classroom, a contemporary model, and explicit reading instruction, a widely recognized conventional approach, both offer unique benefits and have their own place in education. This study aimed to investigate the effects of Flipped Explicit Reading Comprehension Instruction (FERCI) on college EFL trainees’ Reading Comprehension Proficiency (RCP) and its impact on course achievement test scores. Conducted at Injibara College of Teachers Education in Ethiopia, the study involved 53 participants from October 7 to February 6, 2023, utilizing a quasi-experimental pre-test-post-test non-equivalent group design. The participants were assigned into experimental (N=28) and control (N=25) groups. The experimental group received the …

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An Anomaly Detection Method For Protection Relay System In Distribution Networks Based On Kpca‑If Models, Jun Xu, Pengbo Qi, Fan Li, Guorong Wang, Fuguo Yi Jul 2024

An Anomaly Detection Method For Protection Relay System In Distribution Networks Based On Kpca‑If Models, Jun Xu, Pengbo Qi, Fan Li, Guorong Wang, Fuguo Yi

Journal of Electric Power Science and Technology

Due to the complex topology, multiple line branches, and dense spatial distributions of distribution networks, the potential disturbances and failures cannot be eliminated. Thus, a protection system is required to ensure a high level of both reliability and stability. In that case, new challenges in the monitoring and identification of these potential abnormal operation statues must be worked out. To this end, a data-driven-based real-time anomaly detection model is proposed in this paper. To start with, the kernel principal components analysis (KPCA) process is deployed to compress the dimensionality of input data, which can reduce the computational complexity within such …

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Optimal Scheduling Of An Integrated Rural Energy System With Coupled Hybrid Hydrogen‑Carbon Capture Considering Parameter Adaptive Stepped Carbon Trading, Linyao Zhang, Guilian Wu, Shiyuan Ni, Kun Lin, Lijun Liu Jul 2024

Optimal Scheduling Of An Integrated Rural Energy System With Coupled Hybrid Hydrogen‑Carbon Capture Considering Parameter Adaptive Stepped Carbon Trading, Linyao Zhang, Guilian Wu, Shiyuan Ni, Kun Lin, Lijun Liu

Journal of Electric Power Science and Technology

Building clean and efficient integrated rural energy systems is of great significance to the comprehensive promotion of the rural revitalization strategy, an integrated energy system operation model with hydrogen mixing-carbon capture coupling is constructed, and a low-carbon economic scheduling strategy that takes into account the parameter-adaptive stepped carbon trading and stepped incentive-based demand response is proposed in this paper. Firstly, a refined model of gas-fired units after hydrogen doping reform is established, and two-stage electricity-to-gas conversion, carbon capture technologies are integrated to form a coupled hydrogen mixing-carbon capture operation mode; secondly, stepped incentive demand response is introduced to promote the …

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Setting Up An Ambulatory Gi Endoscopy Suite In The Usa-Anesthesia And Sedation Challenges, Basavana Goudra Jul 2024

Setting Up An Ambulatory Gi Endoscopy Suite In The Usa-Anesthesia And Sedation Challenges, Basavana Goudra

Department of Anesthesiology Faculty Papers

Gastrointestinal endoscopy units, both freestanding and associated with ambulatory surgical centers, are on the increase, and the trend is likely to continue. The concept is relatively new, and there are insufficient guidelines and a general dearth of information for prospective planners and physicians. Debate continues in areas such as the selection of patients, appropriateness of procedures, and access to tertiary care. Leaders often scramble to address both critical and non-critical issues, often after the center has opened to the public. They often encounter issues which were not anticipated. In this review, we have provided comprehensive and concise information on the …

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Improved Tripping And Phase‑Separation Adaptive Autoreclosing Strategy Suitable For Ground Fault On Double‑Circuit Transmission Lines, Jiangbo Jiang, Chao Xie, Fengting Li, Chunya Yin Jul 2024

Improved Tripping And Phase‑Separation Adaptive Autoreclosing Strategy Suitable For Ground Fault On Double‑Circuit Transmission Lines, Jiangbo Jiang, Chao Xie, Fengting Li, Chunya Yin

Journal of Electric Power Science and Technology

When a ground fault occurs on double-circuit transmission lines, the conventional tripping strategy may inject negative-sequence components into the system. The traditional autoreclosing scheme does not determine the fault feature before the reclosing, and the stability of the power system will be affected if the reclose fails. To solve the above problems, an improved tripping strategy suitable for ground faults on double-circuit transmission lines is proposed, where phase-separation adaptive autoreclosing is used in the tripping strategy. Firstly, by establishing and analyzing the phase-to-phase coupling model of double-circuit transmission lines, an improved tripping strategy that can avoid the injection of negative-sequence …

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Promotion Strategy And Evaluation Method Of Distribution Network Resilience Considering Load Importance, Zufeng Hou, Chao Wang, Chunhua Xu, Minhong Lin, Jiandian Chen, Guanxin Qiu, Guoxin Jiang, Kai Liao Jul 2024

Promotion Strategy And Evaluation Method Of Distribution Network Resilience Considering Load Importance, Zufeng Hou, Chao Wang, Chunhua Xu, Minhong Lin, Jiandian Chen, Guanxin Qiu, Guoxin Jiang, Kai Liao

Journal of Electric Power Science and Technology

A strategy and evaluation method for enhancing the resilience of distribution networks, which considers load importance under extreme weather disasters, is proposed to improve the resilience enhancement strategy and evaluation system of distribution networks after the occurrence of small-probability， high-risk extreme weather disasters. Firstly, taking typhoon weather as a representative event of extreme weather disasters, the line failure probability is determined based on the typhoon weather model and the failure probability model of overhead lines. Secondly, a three-stage joint optimization strategy model for resilience enhancement is established to determine the joint optimization strategy for resilience enhancement, the faulty lines, and …

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Mechanism And Location Algorithm Of Water Tree In Cable Insulation Based On Broadband Impedance Spectrum, Liqiang Wei, Jingang Su, Tao Han, Yufei Yao, Xianhai Pang Jul 2024

Mechanism And Location Algorithm Of Water Tree In Cable Insulation Based On Broadband Impedance Spectrum, Liqiang Wei, Jingang Su, Tao Han, Yufei Yao, Xianhai Pang

Journal of Electric Power Science and Technology

The water tree in XLPE distribution network cables is a threat to the power grid. In order to study the location mechanism of water tree based on broadband impedance spectrum, an experiment is carried out to accelerate the water tree, and the changes of cable micro-element parameters in different stages of water tree are measured. Then a finite element model of cable water tree section is established and the experimental measurement results are verified. The optimal window function and incident waveform in the location algorithm are determined to get an optimized location algorithm. After that, the effectiveness of algorithm is …

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Analysis Of Power Quality Issues And Quantitative Evaluation Of Additional Losses In Low Voltage Distribution Networks Connected To Household Photovoltaics, Yu Han, Qian Zhou, Yong Li, Xinke Bian, Wei Deng, Haiyun An, Chuanwen Zhang Jul 2024

Analysis Of Power Quality Issues And Quantitative Evaluation Of Additional Losses In Low Voltage Distribution Networks Connected To Household Photovoltaics, Yu Han, Qian Zhou, Yong Li, Xinke Bian, Wei Deng, Haiyun An, Chuanwen Zhang

Journal of Electric Power Science and Technology

Quantitative analysis of additional losses in low-voltage distribution networks is one of the necessary ways to achieve energy conservation and loss reduction in power systems, in response to the serious increase in additional losses caused by the disorderly access of household photovoltaics. This paper focuses on the quantitative relationship between the additional losses of household photovoltaic power generation and distribution lines after being connected to the power grid. Firstly, a theoretical analysis is conducted on the changes in characterization of additional losses for household photovoltaic (PV) access. An equivalent circuit and mathematical model are established for active low-voltage distribution networks …

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Identification Of Key Links In Integrated Energy System Based On Power Flow And Complex Network Theory, Siqi Wang, Zhixian Liang, Zhijie Wang, Hong Wang Jul 2024

Identification Of Key Links In Integrated Energy System Based On Power Flow And Complex Network Theory, Siqi Wang, Zhixian Liang, Zhijie Wang, Hong Wang

Journal of Electric Power Science and Technology

The identification of key links in a comprehensive energy system is of great significance for the research and improvement of system vulnerability. Aiming at the problem that the traditional reductionism method can not explain the system level and the influence of energy flow is not considered in the analysis of complex network, a key link identification method of the IES based on power flow and complex network structure is proposed. Firstly, a comprehensive energy complex network model is established based on power flow, and the mathematical model parameters and power flow results of the IES are introduced into the modeling …

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Analysis Of Global Tourism And Creative Economy Trends To Support Jakarta As A Global City, Banu Muhammad Haidlir, Budiman Mahmud Musthofa, Basuki Muhammad Mukhlish Jul 2024

Analysis Of Global Tourism And Creative Economy Trends To Support Jakarta As A Global City, Banu Muhammad Haidlir, Budiman Mahmud Musthofa, Basuki Muhammad Mukhlish

Journal of Indonesian Tourism and Policy Studies

The city of Jakarta is currently faced with new challenges to become a global city because the status of the country's capital has been revoked. The transformation of Jakarta into a global city requires in-depth study by exploring global trends and looking for the city's potential so that Jakarta can become a globally competitive city. One of the areas that is the focus of this study is tourism and the creative economy. The aim of this study is to analyze global and national trends in tourism and the creative economy. Through library research and document study methods, the author discovered …

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Pilot Experiment For Underground In-Situ Pyrolysis Of Tar-Rich Coal In The Northern Shaanxi Province, Duan Zhonghui, Yang Fu, Wang Zhendong, Ma Li, Duan Xiaoqing, Cao Husheng, Chen Liang Jul 2024

Pilot Experiment For Underground In-Situ Pyrolysis Of Tar-Rich Coal In The Northern Shaanxi Province, Duan Zhonghui, Yang Fu, Wang Zhendong, Ma Li, Duan Xiaoqing, Cao Husheng, Chen Liang

Coal Geology & Exploration

Objective The breakthrough of the pilot experiment for underground in-situ pyrolysis of tar-rich coal in the northern Shaanxi has added new vitality to the research on in-situ conversion of fossil energy such as tar-rich coal and oil shale, and the results have attracted wide attention both inside and outside the industry. The research on underground in-situ pyrolysis of tar rich coal is still in its infancy, lacking systematic research on field engineering data.Methods Based on the pilot experiment, the main geological conditions and engineering difficulties have been clarified, and the progress of underground in-situ pyrolysis has been summarized. The …

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Geological Factors Controlling The Occurrence Of Carboniferous-Permian Tar-Rich Coals In The Ningdong Coalfield, Huang Pengcheng, Guo Weiyong, Ji Xiaoyan, Cai Feifei, Zhang Zhifeng, Huang Kang, Cheng Yunqiang, Liu Zheng, Wang Bei, Chen Rong, Shi Qingmin Jul 2024

Geological Factors Controlling The Occurrence Of Carboniferous-Permian Tar-Rich Coals In The Ningdong Coalfield, Huang Pengcheng, Guo Weiyong, Ji Xiaoyan, Cai Feifei, Zhang Zhifeng, Huang Kang, Cheng Yunqiang, Liu Zheng, Wang Bei, Chen Rong, Shi Qingmin

Coal Geology & Exploration

Objective The Ningdong Coalfield of the Ordos Basin boasts abundant tar-rich coal resources, of which tar-rich coals in the Carboniferous-Permian coal seams exhibit unique occurrence characteristics due to differences in thermal evolution and sedimentary environments. Methods This study analyzed the occurrence characteristics and critical material composition of tar-rich coals in the Hongdunzi and Siguquan mining areas. Based on this, it explored the controlling effects of the degree of coalification and sedimentary environment on the tar yield. Results and Conclusions The results indicate that the Carboniferous-Permian coal seams in the Ningdong Coalfield exhibit average tar yields ranging from 7.15% to 11.07%, …

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Distributions Of Products From The Pyrolysis Of Tar-Rich Coals For Tar Extraction In Northern Shaanxi Province, China, Yu Zunyi, Guo Wei, Yang Panxi, Gao Kun, Yang Fu, Ma Li, Wang Jing, Li Hongqiang, Yang Bolun, Wu Zhiqiang Jul 2024

Distributions Of Products From The Pyrolysis Of Tar-Rich Coals For Tar Extraction In Northern Shaanxi Province, China, Yu Zunyi, Guo Wei, Yang Panxi, Gao Kun, Yang Fu, Ma Li, Wang Jing, Li Hongqiang, Yang Bolun, Wu Zhiqiang

Coal Geology & Exploration

Objective Tar-rich coals stand as a special type of coal resource that integrates coal, oil, and gas properties. These coals, boasting abundant hydrogen-rich structures such as side chains and bridge bonds with aliphatic structures, are prone to crack and produce tar and gas during pyrolysis. These establish tar-rich coals as ideal raw materials that produce oil and gas through thermal conversion. Presently, the research into tar extraction from tar-rich coals through pyrolysis remains in its initial stage, and exploring the impacts of technological conditions, including heat carrier, heating type, and pyrolysis temperature, on the pyrolysis process holds critical significance for …

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Simulation Of The Pyrolysis Process Of Tar-Rich Coals In An H2O Atmosphere Based On The Reactive Force Field Molecular Dynamics, Huang Zibo, Liu Qianru, Liu Hong, Zhou Wenjing, Wei Jinjia Jul 2024

Simulation Of The Pyrolysis Process Of Tar-Rich Coals In An H2O Atmosphere Based On The Reactive Force Field Molecular Dynamics, Huang Zibo, Liu Qianru, Liu Hong, Zhou Wenjing, Wei Jinjia

Coal Geology & Exploration

Objective Tar-rich coal resources, abundant in China, can be converted into energy products (e.g., chemicals and gas/liquid fuels) through pyrolysis, thus alleviating the country’s dependence on oil and gas imports. A thorough understanding of the product evolution and reaction mechanisms of the pyrolysis of tar-rich coals is crucial to research into the clean and efficient conversion processes of coals. Methods Based on the reactive force field molecular dynamics (ReaxFF MD), this study simulated the pyrolysis process of tar-rich coals (long-flame coals) and explored the impacts of the H2O atmosphere on the distribution of pyrolytic products, along with the …

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Spatiotemporal Distributions Of Typical Contaminants From The In-Situ Pyrolysis Of Tar-Rich Coals, Tian Hua, Zhang Ruolin, Wang Qianji, Wu Xiaoyu, Zhang Lei, Zhang Lingru, Fang Siyuan Jul 2024

Spatiotemporal Distributions Of Typical Contaminants From The In-Situ Pyrolysis Of Tar-Rich Coals, Tian Hua, Zhang Ruolin, Wang Qianji, Wu Xiaoyu, Zhang Lei, Zhang Lingru, Fang Siyuan

Coal Geology & Exploration

Objective and Methods Under high temperatures, oil and gas produced from the in situ pyrolysis of tar-rich coals will migrate toward and accumulate in the overburden strata after passing through the fracture zones on the coal seam roof, causing potential contamination risks for the underground environment. To understand the release and distribution characteristics of typical contaminants generated from the underground pyrolysis of tar-rich coals, this study investigated the typical tar-rich coals from the Shenfu mining area of the Jurassic coalfield in northern Shaanxi Province. Based on data on the stratigraphic structures and lithology and using the self-developed equipment for similarity …

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Downhole Heaters For In-Situ Pyrolysis Of Tar-Rich Coals：A Review And Prospects, Wang Zhendong, Duan Zhonghui, Yang Fu, Ma Li Jul 2024

Downhole Heaters For In-Situ Pyrolysis Of Tar-Rich Coals：A Review And Prospects, Wang Zhendong, Duan Zhonghui, Yang Fu, Ma Li

Coal Geology & Exploration

Significance China boasts abundant tar-rich coal resources, which prove to be potential coal-based oil and gas resources capable of ensuring China's energy security. Extracting hydrogen while preserving carbon through the in-situ pyrolysis of tar-rich coals has developed into a trend in the clean and low-carbon utilization of coal resources. Downhole heaters serve as critical equipment for the efficient in-situ pyrolysis of tar-rich coals. Advances Based on investigations and the systematic collection of relevant information and data, this study offers a brief introduction of the currently used methods for in-situ convection heating, focusing on the present situation of the research and …

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Exploring The Pyrolysis Of Tar-Rich Coals Under The Catalysis Of Cerium-Modified Magnetic Core-Shell Hzsm-5, Zhou Anning, Zhang Zhi, Chen Yongan, Zhang Huaiqing, Bai Zhuangwei, Shi Zhiwei, He Xinfu Jul 2024

Exploring The Pyrolysis Of Tar-Rich Coals Under The Catalysis Of Cerium-Modified Magnetic Core-Shell Hzsm-5, Zhou Anning, Zhang Zhi, Chen Yongan, Zhang Huaiqing, Bai Zhuangwei, Shi Zhiwei, He Xinfu

Coal Geology & Exploration

Objective Tar-rich coals are valuable resources integrating coal, tar, and gas properties. Catalytic pyrolysis serves as a significant approach for achieving green and low-carbon development of tar-rich coals. However, the research and development of efficient and recyclable catalysts for the pyrolysis of tar-rich coals remains highly challenging. Methods With HZSM-5@SiO2@MgFe2O4 (HSMF) as the raw material, this study prepared HZSM-5@SiO2@MgFe2O4 (mHSMF) with a hierarchical porous structure using the hydrothermal method and alkali modification, followed by the preparation of cerium-modified mHSMF (5-CeO2/mHSMF) using the precipitation method. Employing a fixed-bed reactor, …

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Grid‑Connected Control Of Direct‑Driven Permanent Magnet Wind Turbine Based On Dual Compensation Droop And Multiple Quasi‑Proportional‑Resonances, Hui Li, Zhulin Li, Sijia Liu, Xinqiao Fan, Kun Qi Jul 2024

Grid‑Connected Control Of Direct‑Driven Permanent Magnet Wind Turbine Based On Dual Compensation Droop And Multiple Quasi‑Proportional‑Resonances, Hui Li, Zhulin Li, Sijia Liu, Xinqiao Fan, Kun Qi

Journal of Electric Power Science and Technology

To achieve safe and stable grid connection of the direct-driven permanent magnet wind power generation system, a grid-connection control strategy combining dual compensation droop with multiple quasi-proportional-resonances (MQPR) is proposed. This strategy originates from traditional droop control, introduces DC voltage compensation in the voltage control loop to quickly adjust and stabilize the DC bus voltage, and introduces capacitive current compensation in the current control loop to effectively reduce the impact of current errors caused by filter capacitors. Meanwhile, a MQPR controller is designed to replace the PI controller of the inner-loop current, which can filter out multiple harmonic currents in …

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Fault Location Method For Complex Distribution Networks Based On Multi‑Terminal Traveling Wave Frequency Matrix, Hang Li, Haiyan Zeng, Kun Yu, Shuang Chen, Jupeng Zeng, Zhongyu Zhang, Xiangjun Zeng, Xi Yang Jul 2024

Fault Location Method For Complex Distribution Networks Based On Multi‑Terminal Traveling Wave Frequency Matrix, Hang Li, Haiyan Zeng, Kun Yu, Shuang Chen, Jupeng Zeng, Zhongyu Zhang, Xiangjun Zeng, Xi Yang

Journal of Electric Power Science and Technology

Aiming at the difficulties that the existing fault location methods are complex to implement and the traveling wave transmission speed cannot be accurately calculated due to the influence of frequency-dependent changes in distribution network line parameters, a fault location method for complex distribution networks is proposed based on the multi-terminal traveling wave frequency matrix, which does not rely on wavefront time information. By analyzing the relationship between the inherent frequency principal component of the fault traveling wave and the transmission distance, the reference terminals of each branch node are defined, and the difference between the benchmark inherent frequency matrix before …

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Research On Leakage Detection Technology Of Low‑Voltage Power System Based On Random Forest Algorithm, Xiangqi Xiao, Yu Xiao, Rui Huang, Yanjiao Huang, Xing He, Mouhai Liu, Jingru Mu Jul 2024

Research On Leakage Detection Technology Of Low‑Voltage Power System Based On Random Forest Algorithm, Xiangqi Xiao, Yu Xiao, Rui Huang, Yanjiao Huang, Xing He, Mouhai Liu, Jingru Mu

Journal of Electric Power Science and Technology

With the rapid increase in the scale of low-voltage distribution system and user demand, leakage faults of user lines and household electrical equipment occur frequently, which increase the risk of electric shock and electrical fire accidents. Residual current protector is a common method to detect low-voltage leakage fault. In recent years, due to the existence of leakage current to ground of lines (or equipment), it also frequently false operates, which greatly reduces the operation rate and reliability of protective equipment. To overcome these issues, this paper proposes a leakage detection technology for low-voltage distribution system based on random forest （RF） …

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Short‑Time Prediction Of Long‑Distance Offshore Wind Power Based On Ramp Characteristics And Improved Praa, Dongmei Huang, Jiahui Zhang, Shuai Shi, Wei Song, Weian Du Jul 2024

Short‑Time Prediction Of Long‑Distance Offshore Wind Power Based On Ramp Characteristics And Improved Praa, Dongmei Huang, Jiahui Zhang, Shuai Shi, Wei Song, Weian Du

Journal of Electric Power Science and Technology

The conditions in long-distance offshore areas are complex, and surface wind speeds are highly susceptible to the influence of mesoscale oceanic events. The resulting anomalous data points and bump events will decrease the accuracy of ramp-up detection, affecting the short-term forecasting precision of offshore wind power in long-distance sea areas. Therefore, a short-term forecasting method for offshore wind power in long-distance sea areas is proposed, which simultaneously considers ramp-up events and long-distance sea meteorological factors. Firstly, an improved parameter and resolution adaptive algorithm （PRAA） based on state marker and sliding window is designed to detect ramp-up events and extract features. …

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State Estimation Of Power System Based On Cubature Kalman Filter Under False Data Injection Attacks, Mengyan Chang, Yonghui Liu Jul 2024

State Estimation Of Power System Based On Cubature Kalman Filter Under False Data Injection Attacks, Mengyan Chang, Yonghui Liu

Journal of Electric Power Science and Technology

Aiming at the problem of system state estimation under false data injection attacks, the mathematical model of power system was established according to the third-order model of generator and the model of automatic voltage regulator, taking the cyber-physical power system as the research object. The exponential smoothing method was used to predict the measured value, and by comparing the predicted value with the actual measured value, it detected whether there were false data injection attacks in the system. If the detection results determine that the system being subjected to false data injection attacks, the predicted value is used instead of …

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Multi‑Time Scale Optimal Dispatch Of Integrated Energy Systems Considering Source‑Load Uncertainty And User‑Side Demand Response, Xiangyuan Chen, Gongping Wu, Zhuo Long, Hui Xiao, Li Xu, Qiyun Ling Jul 2024

Multi‑Time Scale Optimal Dispatch Of Integrated Energy Systems Considering Source‑Load Uncertainty And User‑Side Demand Response, Xiangyuan Chen, Gongping Wu, Zhuo Long, Hui Xiao, Li Xu, Qiyun Ling

Journal of Electric Power Science and Technology

A multi-timescale optimal scheduling strategy for integrated energy system considering source-load uncertainty and user demand response is proposed to address the problems of source-load uncertainty and equipment power fluctuation in the energy system. First, according to the respective characteristics of the source and load, the robust optimization method and the stochastic optimization method are used to deal with the uncertainty of the source and load. Second, based on the scheduling characteristics and response differences of electricity, heat and gas loads in different time scales, a demand response model corresponding to different time scales is designed, and a multi-timescale optimization model …

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Coordinated Control And Optimal Design Method Of Multi‑Mode Access Energy Storage In Energy Collection System, Hongyang Huang, Zhenxiao Zhang, Zhiliang Xie, Heng Nian, Jianyong Wu Jul 2024

Coordinated Control And Optimal Design Method Of Multi‑Mode Access Energy Storage In Energy Collection System, Hongyang Huang, Zhenxiao Zhang, Zhiliang Xie, Heng Nian, Jianyong Wu

Journal of Electric Power Science and Technology

With the increasing proportion of renewable energy devices in the energy collection system, the uncertainty of photovoltaic and load pose power quality issues and challenges to the stable operation of the grid. The voltage and power compensation control of the system can be realized through energy storage access. First, the coupling influence mechanism between voltage and power is analyzed. Then, the series-connectded mode and the parallel-connectded mode energy storage are used to compensate the fluctuation of grid voltage and power through coordinated control. Finally, based on the coordinated control of energy storage, the capacity of energy storage equipment with different …

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Dc Electric Energy Router Control Strategy Combining The Input Voltage Sharing And Virtual Dc Machine, Tao Li, Weide Guan, Xuhong Wang, Xiangyang Xia, Yun Yang, Jian Zhong Jul 2024

Dc Electric Energy Router Control Strategy Combining The Input Voltage Sharing And Virtual Dc Machine, Tao Li, Weide Guan, Xuhong Wang, Xiangyang Xia, Yun Yang, Jian Zhong

Journal of Electric Power Science and Technology

For at the DC electric energy router in the MVDC distribution network, there are some issues when renewable energy sources fluctuate. Under these conditions, the traditional control strategy has a general control effect on the DC bus and the voltage is easy to violate. Based on the modular input‑series-output-parallel (ISOP) type topology, a DC electric energy router control strategy combining the input voltage sharing and virtual DC machine is proposed. First, the power balancing control characteristics between the modules in the input voltage sharing control process are studied and compared with the output current sharing control; then, the virtual DC …

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Biochar Source And Rate Effects On Soil Ph And Water-Soluble Nutrients Over Time In Simulated Furrow-Irrigated Rice In The Greenhouse, Jonathan Brye, Lauren Gwaltney, Diego Della Lunga, Kristofor Brye Jul 2024

Biochar Source And Rate Effects On Soil Ph And Water-Soluble Nutrients Over Time In Simulated Furrow-Irrigated Rice In The Greenhouse, Jonathan Brye, Lauren Gwaltney, Diego Della Lunga, Kristofor Brye

Crop, Soil and Environmental Sciences Faculty Publications and Presentations

Biochar is the by-product of burning vegetative dry matter and can positively impact soil properties as an organic soil amendment, leading to biochar’s increased use in agroecosystems. The objective of this study was to evaluate the effects of biochar source [i.e., an Arkansas (AR) and Colorado (CO) biochar] and rate (i.e., 0, 2.5, and 5 Mg ha -1 ) on soil pH and water-soluble (WS) soil phosphorus (P), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), and sulfur (S) concentrations in simulated-furrow-irrigated rice ( Oryza sativa ) on a silt-loam soil (Typic Albaqualf) in the greenhouse. Soil pH differed among …

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The College Campus, A Place Of Learning, And A Place Of Healing, Huma Bashir, Joshua Francis Jul 2024

The College Campus, A Place Of Learning, And A Place Of Healing, Huma Bashir, Joshua Francis

Human Services Faculty Publications

The COVID-19 pandemic and its aftermath have precipitated a marked increase in mental health needs among college students. Lockdowns, the sudden shift to remote learning, and social distancing mandates have compounded existing challenges, highlighting a trend that has evolved over the past two decades. Despite heightened demand for mental health support, colleges struggle to meet these needs amid the emotional aftermath of COVID-19 effectively. Recognizing the pivotal role of higher education institutions in shaping future leaders and addressing and enhancing the mental well-being of the college community is imperative to foster an environment conducive to learning and healing. This paper …

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Modeling Powder Spreadability In Powder-Based Processes Using The Discrete Element Method, Austin T. Sutton, M. Hossein Sehhat, Ming C. Leu, Joseph W. Newkirk Jul 2024

Modeling Powder Spreadability In Powder-Based Processes Using The Discrete Element Method, Austin T. Sutton, M. Hossein Sehhat, Ming C. Leu, Joseph W. Newkirk

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Powder-bed fusion (PBF) processes refer to a subset of Additive Manufacturing (AM) techniques where powder is spread on the build-plate before melting (by a laser or electron beam). While PBF processes are attractive due to their ability for realizing complex structures that are either difficult or impossible to create through conventional means, the parts fabricated with these techniques can exhibit defects such as pores, inclusions, and excessive surface roughness. To minimize these defects, much research has been dedicated towards process maturation by optimizing laser or electron beam parameters. However, these developmental efforts typically do not address the recoating process where …

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