Energy Engineering: Journal of the Association of Energy Engineers最新文献_第10页

Optimization of DC Resistance Divider Up to 1200 kV Using Thermal and Electric Field Analysis 利用热电场分析优化1200kv直流分压器

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.028282

Dengyun Li, Baiwen Du, Kai Zhu, Jicheng Yu, Siyuan Liang, Changxi Yue

{"title":"Optimization of DC Resistance Divider Up to 1200 kV Using Thermal and Electric Field Analysis","authors":"Dengyun Li, Baiwen Du, Kai Zhu, Jicheng Yu, Siyuan Liang, Changxi Yue","doi":"10.32604/ee.2023.028282","DOIUrl":"https://doi.org/10.32604/ee.2023.028282","url":null,"abstract":"Self-heating and electric field distribution are the primary factors affecting the accuracy of the Ultra High Voltage Direct Current (UHVDC) resistive divider. Reducing the internal temperature rise of the voltage divider caused by self-heating, reducing the maximum electric field strength of the voltage divider, and uniform electric field distribution can effectively improve the UHVDC resistive divider’s accuracy. In this paper, thermal analysis and electric field distribution optimization design of 1200 kV UHVDC resistive divider are carried out: (1) Using the proposed iterative algorithm, the heat dissipation and temperature distribution of the high voltage DC resistive divider are studied, and the influence of the ambient temperature and the power of the divider on the temperature of the insulating medium of the divider is analyzed; (2) Established the finite element models of 1200 kV and 2 × 600 kV DC resistive dividers, analyzed the influence of the size of the grading ring and the installation position on the maximum electric field strength of the voltage divider, and calculated the impact of the shielding resistor layer on the vicinity of the measuring resistor layer. The research indicates that: (1) The temperature of the insulating medium is linearly related to the horsepower of the voltage divider and the ambient temperature; (2) After the optimized design of the electric field, the maximum electric field strength of the 1200 kV DC resistive divider is reduced to 1471 V/mm, which is about 24% lower than that of the unoptimized design; (3) Installing the shielding resistor layer can significantly improve the electric field near the measuring resistor layer. This paper has an important reference function for improving the accuracy of the UHVDC resistive divider.","PeriodicalId":35610,"journal":{"name":"Energy Engineering: Journal of the Association of Energy Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135214874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engine Performance Using Blended Fuels of Biodiesel and Eco Diesel 使用生物柴油和生态柴油混合燃料的发动机性能

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.019203

Muhammad Idris, I. Husin, I. Hermawan, U. Novalia, R. D. Batubara, Nugroho Agung Pambudi, Alfan Sarifudin

引用次数: 0

Optimal Scheduling Method of Cogeneration System with Heat Storage Device Based on Memetic Algorithm 基于模因算法的蓄热热电联产系统优化调度方法

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.023715

Haibo Li, Yibao Wang, Xinfu Pang, Wei Liu, Xu Zhang

引用次数: 0

Parameter Design of Current Double Closed Loop for T-Type Three-Level Grid-Connected Inverter t型三电平并网逆变器电流双闭环参数设计

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.026948

Tiankui Sun, M. Shi, Xiaolong Xiao, Ping He, Yuqi Ji, Zhiyuan Yuan

引用次数: 0

Research on Asymmetric Fault Location of Wind Farm Collection System Based on Compressed Sensing 基于压缩感知的风电场采集系统非对称故障定位研究

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.028365

Huanan Yu, G. Han, Hansong Luo, He Wang

引用次数: 0

Experimental Investigation on Fracturing Behaviors after Liquid Nitrogen Pre-Injection in High-Temperature Sandstone 高温砂岩预注液氮压裂行为实验研究

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.041803

Decheng Li, Yan Zhang, Dongdong Ma, Haozhe Geng, Yu Wu

{"title":"Experimental Investigation on Fracturing Behaviors after Liquid Nitrogen Pre-Injection in High-Temperature Sandstone","authors":"Decheng Li, Yan Zhang, Dongdong Ma, Haozhe Geng, Yu Wu","doi":"10.32604/ee.2023.041803","DOIUrl":"https://doi.org/10.32604/ee.2023.041803","url":null,"abstract":"The fracturing process of sandstone is inherently complex due to its loose internal structure and deformation adaptability. Liquid nitrogen pre-injection has emerged as a promising approach to damage reservoir rocks, effectively reducing fracture pressure and establishing intricate fracture networks, thus offering a potential solution for reservoir reconstruction. To unravel the fundamental mechanisms governing sandstone fracturing behaviors following liquid nitrogen pre-injection, sandstone fracturing experiments were conducted under varying durations of liquid nitrogen injection, rock temperature, and in-situ stress conditions. The experiments showcased the evolution of injection pressure and fracture characteristics under different testing conditions, complemented by electron microscope analysis to elucidate the factors driving the complex fracture characteristics of sandstone. The findings revealed a significant decrease in fracture pressure after liquid nitrogen pre-injection, accompanied by a notable increase in the complexity of the fracture network and the roughness of the fracture surface. Moreover, prolonging the duration of liquid nitrogen injection and elevating reservoir temperature further contributed to reducing fracture pressure, consequently enhancing fracture complexity and surface roughness. Conversely, the application of confining pressure amplified fracture pressure while intensifying the degree of fracturing. Notably, the investigation highlighted the increased presence of microcracks in sandstone resulting from liquid nitrogen pre-injection, facilitating fluid diffusion during fracturing and yielding lower fracture pressures, thereby enhancing the effectiveness of sandstone reservoir reformation. The research results can provide theoretical guidance for geothermal reservoir reconstruction.","PeriodicalId":35610,"journal":{"name":"Energy Engineering: Journal of the Association of Energy Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135214879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of Effectiveness of Energy Management System in Buildings 建筑能源管理系统有效性的确定

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.025218

Vivash Karki, Roseline Mostafa, Bhaskaran Gopalakrishnan, Derek R. Johnson

{"title":"Determination of Effectiveness of Energy Management System in Buildings","authors":"Vivash Karki, Roseline Mostafa, Bhaskaran Gopalakrishnan, Derek R. Johnson","doi":"10.32604/ee.2023.025218","DOIUrl":"https://doi.org/10.32604/ee.2023.025218","url":null,"abstract":"Building Energy Management Systems (BEMS) are computer-based systems that aid in managing, controlling, and monitoring the building technical services and energy consumption by equipment used in the building. The effectiveness of BEMS is dependent upon numerous factors, among which the operational characteristics of the building and the BEMS control parameters also play an essential role. This research develops a user-driven simulation tool where users can input the building parameters and BEMS controls to determine the effectiveness of their BEMS. The simulation tool gives the user the flexibility to understand the potential energy savings by employing specific BEMS control and help in making intelligent decisions. The simulation is developed using Visual Basic Application (VBA) in Microsoft Excel, based on discrete-event Monte Carlo Simulation (MCS). The simulation works by initially calculating the energy required for space cooling and heating based on current building parameters input by the user in the model. Further, during the second simulation, the user selects all the BEMS controls and improved building envelope to determine the energy required for space cooling and heating during that case. The model compares the energy consumption from the first simulation and the second simulation. Then the simulation model will provide the rating of the effectiveness of BEMS on a continuous scale of 1 to 5 (1 being poor effectiveness and 5 being excellent effectiveness of BEMS). This work is intended to facilitate building owner/energy managers to analyze the building energy performance concerning the efficacy of their energy management system.","PeriodicalId":35610,"journal":{"name":"Energy Engineering: Journal of the Association of Energy Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136229292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Parallel Integrated Model-Driven and Data-Driven Online Transient Stability Assessment Method for Power System 电力系统模型驱动与数据驱动并行集成在线暂态稳定评估方法

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.026816

Ying Zhang, Xiaoqing Han, Chao Zhang, Ying Qu, Yang Liu, Gengwu Zhang

{"title":"Parallel Integrated Model-Driven and Data-Driven Online Transient Stability Assessment Method for Power System","authors":"Ying Zhang, Xiaoqing Han, Chao Zhang, Ying Qu, Yang Liu, Gengwu Zhang","doi":"10.32604/ee.2023.026816","DOIUrl":"https://doi.org/10.32604/ee.2023.026816","url":null,"abstract":"More and more uncertain factors in power systems and more and more complex operation modes of power systems put forward higher requirements for online transient stability assessment methods. The traditional model-driven methods have clear physical mechanisms and reliable evaluation results but the calculation process is time-consuming, while the data-driven methods have the strong fitting ability and fast calculation speed but the evaluation results lack interpretation. Therefore, it is a future development trend of transient stability assessment methods to combine these two kinds of methods. In this paper, the rate of change of the kinetic energy method is used to calculate the transient stability in the model-driven stage, and the support vector machine and extreme learning machine with different internal principles are respectively used to predict the transient stability in the data-driven stage. In order to quantify the credibility level of the data-driven methods, the credibility index of the output results is proposed. Then the switching function controlling whether the rate of change of the kinetic energy method is activated or not is established based on this index. Thus, a new parallel integrated model-driven and data-driven online transient stability assessment method is proposed. The accuracy, efficiency, and adaptability of the proposed method are verified by numerical examples.","PeriodicalId":35610,"journal":{"name":"Energy Engineering: Journal of the Association of Energy Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135213033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on Representative Engineering Applications of Anemometer Towers Location in Complex Topography Wind Resource Assessment 风速塔定位在复杂地形风资源评价中的代表性工程应用研究

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2022.019927

Hao Liu, Xiaoyang Zhang, Zhong-Yuan Yan, Yingjian Yang, Qing’an Li, C. Cai

引用次数: 0

Optimization of a Single Flash Geothermal Power Plant Powered by a Trans-Critical Carbon Dioxide Cycle Using Genetic Algorithm and Nelder-Mead Simplex Method 利用遗传算法和Nelder-Mead单纯形法优化跨临界二氧化碳循环驱动的单闪式地热发电厂

Energy Engineering: Journal of the Association of Energy Engineers Pub Date : 2023-01-01 DOI: 10.32604/ee.2023.022587

Yashar Aryanfar, Jorge Luis Garc韆 Alcaraz

引用次数: 1