Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180391
Dajie Zhuang, Guoqiang Li, Hongchao Sun, Xuexin Wang
The thermal protection performance of the transport container should be considered when designing the radioactive waste source transport container with higher decay heat. The temperature distribution of the container under the normal conditions of transport for heat transfer performance and accident conditions for thermal performance are analyzed and calculated using the finite element analysis method, and the verification test is carried out. Both analysis and test results show that under normal conditions, the container can export the decay heat from the radiation source, and the container can be used in a non-exclusive manner for an accessible surface temperature of less than 50°C. Moreover, under accident conditions, it can effectively prevent the external heat from the fire environment so that the temperature of shielding parts of the container is lower than 327°C, which is the melting point of lead, and ensure the shielding performance is not lost. Its thermal performance meets the relevant requirements of standards and design.
{"title":"Thermal Design and Verification of a Transport Container for Co-60 Waste Source","authors":"Dajie Zhuang, Guoqiang Li, Hongchao Sun, Xuexin Wang","doi":"10.1109/ICESGE56040.2022.10180391","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180391","url":null,"abstract":"The thermal protection performance of the transport container should be considered when designing the radioactive waste source transport container with higher decay heat. The temperature distribution of the container under the normal conditions of transport for heat transfer performance and accident conditions for thermal performance are analyzed and calculated using the finite element analysis method, and the verification test is carried out. Both analysis and test results show that under normal conditions, the container can export the decay heat from the radiation source, and the container can be used in a non-exclusive manner for an accessible surface temperature of less than 50°C. Moreover, under accident conditions, it can effectively prevent the external heat from the fire environment so that the temperature of shielding parts of the container is lower than 327°C, which is the melting point of lead, and ensure the shielding performance is not lost. Its thermal performance meets the relevant requirements of standards and design.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116914945","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180310
Zvanaka S. Mazhandu, E. Muzenda, M. Belaid, Trust Nhubu, C. Mbohwa
Gasification is an emerging technology in plastic waste management. The process involves partial oxidation, which occurs between $600-800^{circ}mathrm{C}$, although higher temperatures can also be employed. Several gasification plants exist in countries such as Japan, the United Kingdom (UK), America, and Finland that produce synthesis gas (syngas) or ethanol. This study aims to identify the main gasification reactors, the advantages and disadvantages of each, emissions surrounding the process and alleviatory measures. Despite the concerns about harmful emissions generated from gasification, various primary and secondary actions can be implemented to ensure that emissions are within the recommended environmental limits. However, several technological aspects must be considered to ensure environmental sustainability, including reactor configuration, feedstock composition and operating parameters.
{"title":"An Overview of Leading Gasification Technologies, Emissions and Mitigatory Measures","authors":"Zvanaka S. Mazhandu, E. Muzenda, M. Belaid, Trust Nhubu, C. Mbohwa","doi":"10.1109/ICESGE56040.2022.10180310","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180310","url":null,"abstract":"Gasification is an emerging technology in plastic waste management. The process involves partial oxidation, which occurs between $600-800^{circ}mathrm{C}$, although higher temperatures can also be employed. Several gasification plants exist in countries such as Japan, the United Kingdom (UK), America, and Finland that produce synthesis gas (syngas) or ethanol. This study aims to identify the main gasification reactors, the advantages and disadvantages of each, emissions surrounding the process and alleviatory measures. Despite the concerns about harmful emissions generated from gasification, various primary and secondary actions can be implemented to ensure that emissions are within the recommended environmental limits. However, several technological aspects must be considered to ensure environmental sustainability, including reactor configuration, feedstock composition and operating parameters.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121876148","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}
This research uses the principal component comprehensive score approach to rank and evaluate the ambient air quality of the Harbin urban area and administrative region during the last two years in a more scientific and rational manner. After analyzing the ambient air quality data from 2020 to 2021 by SPSS26.0, the results show that the top five districts in the comprehensive score of ambient air quality are Fangzheng County, Bin County, Tonghe County, Wuchang City, and Mulan County. The last five districts are Nangang District, Xiangfang District, Daoli District, Daowai District, and Pingfang district. This method gives weight to the evaluation indicators to make the indicators with more significant impact factors play a more prominent role in the evaluation. Moreover, it removes redundant information in the indicators and makes the assessment results more scientific and reasonable. Significantly, the research can also be extended to the ranking evaluation of various environmental elements, providing a new idea for formulating assessment and evaluation policies of ecological environment quality.
{"title":"Evaluation of Ambient Air Quality Ranking in Harbin Based on Principal Component Analysis and Comprehensive Score Method","authors":"Zhihao Zhang, Jiazhuo Qi, Jun-jian Ma, Xiaoyan Wang, Fengying Zhang, Yanan Li","doi":"10.1109/ICESGE56040.2022.10180323","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180323","url":null,"abstract":"This research uses the principal component comprehensive score approach to rank and evaluate the ambient air quality of the Harbin urban area and administrative region during the last two years in a more scientific and rational manner. After analyzing the ambient air quality data from 2020 to 2021 by SPSS26.0, the results show that the top five districts in the comprehensive score of ambient air quality are Fangzheng County, Bin County, Tonghe County, Wuchang City, and Mulan County. The last five districts are Nangang District, Xiangfang District, Daoli District, Daowai District, and Pingfang district. This method gives weight to the evaluation indicators to make the indicators with more significant impact factors play a more prominent role in the evaluation. Moreover, it removes redundant information in the indicators and makes the assessment results more scientific and reasonable. Significantly, the research can also be extended to the ranking evaluation of various environmental elements, providing a new idea for formulating assessment and evaluation policies of ecological environment quality.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129066510","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}
Pub Date : 2022-12-09DOI: 10.1109/icesge56040.2022.10180394
T. Yuan, Dingjian Li
In this study, a metal hydride reactor was built as a temperature field test device. The temperature curve was then measured under various intake pressure and flow conditions, as well as after adding heat exchange fins, to determine the distribution trend and rule of the reactor's temperature field. The experimental results show that when hydrogen is charged at a constant intake pressure, the reactor's internal temperature rises rapidly, and the upper and lower bed temperature rises uniformly. When the intake pressure increases continuously, the maximum temperature of the inner and outer walls of the reactor becomes higher, and the hydrogenation reaction time is shorter. When hydrogen is charged at a constant intake rate, the temperature rise of the whole reactor is more stable, and the time for the bed to rise to the maximum temperature is longer. Still, the maximum temperature of the bed is lower than that of the full-flow hydrogen supply mode. Heat transfer fins can improve the heat transfer performance of the reactor, reduce the maximum temperature reached by the bed, and timely conduct excess heat in the reactor to the outer wall.
{"title":"Analysis and Optimization of Metal Hydride Reactors Heat Transfer Properties","authors":"T. Yuan, Dingjian Li","doi":"10.1109/icesge56040.2022.10180394","DOIUrl":"https://doi.org/10.1109/icesge56040.2022.10180394","url":null,"abstract":"In this study, a metal hydride reactor was built as a temperature field test device. The temperature curve was then measured under various intake pressure and flow conditions, as well as after adding heat exchange fins, to determine the distribution trend and rule of the reactor's temperature field. The experimental results show that when hydrogen is charged at a constant intake pressure, the reactor's internal temperature rises rapidly, and the upper and lower bed temperature rises uniformly. When the intake pressure increases continuously, the maximum temperature of the inner and outer walls of the reactor becomes higher, and the hydrogenation reaction time is shorter. When hydrogen is charged at a constant intake rate, the temperature rise of the whole reactor is more stable, and the time for the bed to rise to the maximum temperature is longer. Still, the maximum temperature of the bed is lower than that of the full-flow hydrogen supply mode. Heat transfer fins can improve the heat transfer performance of the reactor, reduce the maximum temperature reached by the bed, and timely conduct excess heat in the reactor to the outer wall.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115029869","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180392
Songchol Hong, Un Yong Paek, Song Ho Kim, Yangling Qi, Xing-ming Zhao
This paper investigates the thermal decomposition and synthetic reaction kinetics of superconducting material and provides the reference data for the production process of high-temperature superconducting tapes. First, a precursor solution was prepared as acetate of components of YBa2Cu3O7-δ(YBCO) material and various thermal analyses were performed using the powders obtained by drying and grinding processes. Then, the synthesis mechanism of YBCO superconducting phase and the kinetic parameters were obtained using the universal differential, integral and multi-rate scanning Kissinger methods. The results showed that the thermal decomposition was divided into four stages characterized by weight loss from 25°C to 900°C. The fourth stage for the synthesis reaction of YBCO phase follows the random nucleation and subsequent growth (n = 2) model; the activation energy and pre-exponential factor of the fourth stage were 222 kJ/mol and $2.34 times 10^{10}/min$, respectively. In terms of reaction mechanism and kinetic parameters, the kinetic equation expressing the formation process of YBCO superconducting phase was obtained.
{"title":"Formation Process of YBCO Superconducting Phase by Metal Organic Deposition: Formation of YBCO Superconducting Phase","authors":"Songchol Hong, Un Yong Paek, Song Ho Kim, Yangling Qi, Xing-ming Zhao","doi":"10.1109/ICESGE56040.2022.10180392","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180392","url":null,"abstract":"This paper investigates the thermal decomposition and synthetic reaction kinetics of superconducting material and provides the reference data for the production process of high-temperature superconducting tapes. First, a precursor solution was prepared as acetate of components of YBa2Cu3O7-δ(YBCO) material and various thermal analyses were performed using the powders obtained by drying and grinding processes. Then, the synthesis mechanism of YBCO superconducting phase and the kinetic parameters were obtained using the universal differential, integral and multi-rate scanning Kissinger methods. The results showed that the thermal decomposition was divided into four stages characterized by weight loss from 25°C to 900°C. The fourth stage for the synthesis reaction of YBCO phase follows the random nucleation and subsequent growth (n = 2) model; the activation energy and pre-exponential factor of the fourth stage were 222 kJ/mol and $2.34 times 10^{10}/min$, respectively. In terms of reaction mechanism and kinetic parameters, the kinetic equation expressing the formation process of YBCO superconducting phase was obtained.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"10 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113968309","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}
The stable operation of the giant hydro-generator unit's shaft system determines the power station's safety. In this study, the full three-dimensional model of the shaft system of a 1000 MW hydro-generator unit is established to accurately analyze the structural behavior of the shaft system via the finite element method with different boundary conditions. The analysis results show that the installation deviation increases the oil film thickness of the hydraulic bearings and greatly reduces the bearing stiffness of the hydro-generator shaft system. Since the bearings are the most important boundary conditions of the shaft system, the reduction of the bearing stiffness due to installation deviation is 1/10 of the designed bearing stiffness, which significantly changes the eigenmodes and eigenfrequencies of the hydro-generator shaft system. The first eigenfrequency of the hydro-generator shaft system with installation deviations is around 68.8% of the eigenfrequency without installation deviations. The installation deviations negatively affect the safe operation of hydro-generator units. Therefore, it is extremely important to control the shaft system installation deviation with high precision to ensure the stable operation of hydro generator units.
{"title":"Study on the Importance of Precise Control of Installation Deviation to the Structural Behavior of the Shaft System of a 1000 MW Hydro-generator Unit","authors":"Yongsheng Zhang, Xingxing Huang, Yongsheng Liu, Guanglin Ma, Chengming Liu, Yifan Wang, Jiwen Zhang, Yishu Shif, Jingwei Cao, Zhengwei Wang","doi":"10.1109/ICESGE56040.2022.10180383","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180383","url":null,"abstract":"The stable operation of the giant hydro-generator unit's shaft system determines the power station's safety. In this study, the full three-dimensional model of the shaft system of a 1000 MW hydro-generator unit is established to accurately analyze the structural behavior of the shaft system via the finite element method with different boundary conditions. The analysis results show that the installation deviation increases the oil film thickness of the hydraulic bearings and greatly reduces the bearing stiffness of the hydro-generator shaft system. Since the bearings are the most important boundary conditions of the shaft system, the reduction of the bearing stiffness due to installation deviation is 1/10 of the designed bearing stiffness, which significantly changes the eigenmodes and eigenfrequencies of the hydro-generator shaft system. The first eigenfrequency of the hydro-generator shaft system with installation deviations is around 68.8% of the eigenfrequency without installation deviations. The installation deviations negatively affect the safe operation of hydro-generator units. Therefore, it is extremely important to control the shaft system installation deviation with high precision to ensure the stable operation of hydro generator units.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"398 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124749225","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180374
Tao Yu, Jinzhou Meng, Zhihong Xu, Hua Xie, Zhengxi Jia, Hengli Quan
With increasingly serious environmental problems, energy structure transformation has become an inevitable trend. Using renewable energy to generate hydrogen is an effective way to achieve green electricity to produce green hydrogen. This paper takes photovoltaic (PV) off-grid hydrogen production system as the research object, analyzes the typical structure of the system, and establishes the mathematical model and simulation model of PV array, electrolyzer, PV converter and hydrogen production power supply. The control strategy of the system is designed, PV output power is controlled by maximum power point tracking (MPPT), and multiple PV modules are connected in parallel with master-slave control. Based on MATLAB /Simulink, three typical scenarios of steady operation of the system, increase of PV power generation and decrease of PV power generation are selected for simulation analysis. The simulation results show that the PV off-grid hydrogen production system established in this paper can produce hydrogen stably.
{"title":"Modeling and Simulation of Photovoltaic Off-Grid Hydrogen Production System","authors":"Tao Yu, Jinzhou Meng, Zhihong Xu, Hua Xie, Zhengxi Jia, Hengli Quan","doi":"10.1109/ICESGE56040.2022.10180374","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180374","url":null,"abstract":"With increasingly serious environmental problems, energy structure transformation has become an inevitable trend. Using renewable energy to generate hydrogen is an effective way to achieve green electricity to produce green hydrogen. This paper takes photovoltaic (PV) off-grid hydrogen production system as the research object, analyzes the typical structure of the system, and establishes the mathematical model and simulation model of PV array, electrolyzer, PV converter and hydrogen production power supply. The control strategy of the system is designed, PV output power is controlled by maximum power point tracking (MPPT), and multiple PV modules are connected in parallel with master-slave control. Based on MATLAB /Simulink, three typical scenarios of steady operation of the system, increase of PV power generation and decrease of PV power generation are selected for simulation analysis. The simulation results show that the PV off-grid hydrogen production system established in this paper can produce hydrogen stably.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417842","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180372
Pengyi Wang, Dajie Zhuang, Lei Chen, Yiren Lian, Shutang Sun
Reprocessed uranium (RepU) recycling can effectively reduce the amount of radioactive waste from spent nuclear fuel and improve the utilization efficiency of uranium resources as a supplement to the fissile material of natural uranium. However, three uranium isotopes produced and accumulated in the reactor may present problems in RepU recycling. They are ${}^{232}mathbf{U}$, whose daughter products are $beta$ and $gamma$ rays emitters, ${}^{234}mathbf{U}$ as $boldsymbol{alpha}$ rays emitters, and ${}^{236}mathbf{U}$ as neutron absorbers, respectively. These nuclides put forward higher radiation protection requirements for the facilities and equipment in the RepU recycling process. By combining the nuclides characteristics of RepU and uranium processing procedures, and experiences learned from advanced countries that are experienced and specialized in utilizing RepU,this paper summarizes the special requirements for RepU recycling. Furthermore, it suggests the main processes during RepU recycling, including uranium conversion, enrichment, and fuel assembly fabrication from a radiation protection standpoint, which promotes RepU recycling in China and reduces ionizing hazards to an acceptable level.
{"title":"The Special Requirements of RepU Recycling from Radiation Protection Viewpoint","authors":"Pengyi Wang, Dajie Zhuang, Lei Chen, Yiren Lian, Shutang Sun","doi":"10.1109/ICESGE56040.2022.10180372","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180372","url":null,"abstract":"Reprocessed uranium (RepU) recycling can effectively reduce the amount of radioactive waste from spent nuclear fuel and improve the utilization efficiency of uranium resources as a supplement to the fissile material of natural uranium. However, three uranium isotopes produced and accumulated in the reactor may present problems in RepU recycling. They are ${}^{232}mathbf{U}$, whose daughter products are $beta$ and $gamma$ rays emitters, ${}^{234}mathbf{U}$ as $boldsymbol{alpha}$ rays emitters, and ${}^{236}mathbf{U}$ as neutron absorbers, respectively. These nuclides put forward higher radiation protection requirements for the facilities and equipment in the RepU recycling process. By combining the nuclides characteristics of RepU and uranium processing procedures, and experiences learned from advanced countries that are experienced and specialized in utilizing RepU,this paper summarizes the special requirements for RepU recycling. Furthermore, it suggests the main processes during RepU recycling, including uranium conversion, enrichment, and fuel assembly fabrication from a radiation protection standpoint, which promotes RepU recycling in China and reduces ionizing hazards to an acceptable level.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128499878","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180373
Yunsheng Ma, Liandong Dai, Xiao-Jing Hao, Zonghua Ding, Na Li
The current popular deep learning technology of artificial neural networks has been vigorously developed and gradually applied to space weather. Global total electron content (TEC) map data publicly provided by the International GNSS Service (IGS) are 71×73 grids with temporal resolution of 1 hour and spatial resolution of 5°×2.5°, which can be used as sufficient training samples for deep learning. Variation of TEC is closely related to solar activity and geomagnetic activity, so data sets for this article are created based on 2019–2020 TEC map data, as well as the hourly solar radiation index F107 and geomagnetic index Kp together with the corresponding time, and longitude and latitude of each parameter are introduced as supervision information. The long short-term memory (LSTM) network and the multilayer perceptron (MLP) in the deep learning method are used to build a 9-layer deep neural network for training and verification, so that the advantages of the “gate” mechanism of LSTM network in time series modeling and the advantages of MLP in comprehensive consideration and high reliability can be fully brought into play. 70% of data sets are divided into training sets and 30% for validation, which runs in CPU environment. Adam algorithm is used for optimization, and the batch size is set to 24. The training results show that the minimum RMSE is 0.249 TECu, and the maximum RMSE is 4.240 TECu. RMSE of one step prediction is 0.650 TECu, and MAPE is 3.181%.
目前流行的人工神经网络深度学习技术得到了大力发展，并逐步应用于空间天气。国际GNSS Service (IGS)公开提供的全球总电子含量(TEC)地图数据为71×73网格，时间分辨率为1小时，空间分辨率为5°×2.5°，可作为深度学习的充足训练样本。TEC的变化与太阳活动和地磁活动密切相关，因此本文的数据集是基于2019-2020年TEC地图数据，以及每小时太阳辐射指数F107和地磁指数Kp及其对应的时间，并引入各参数的经纬度作为监督信息。利用长短期记忆(LSTM)网络和深度学习方法中的多层感知器(MLP)构建9层深度神经网络进行训练和验证，充分发挥LSTM网络在时间序列建模方面的“门”机制优势和MLP在综合考虑和高可靠性方面的优势。70%的数据集分为训练集，30%用于验证，在CPU环境下运行。采用Adam算法进行优化，批大小设置为24。训练结果表明，最小RMSE为0.249 TECu，最大RMSE为4.240 TECu。一步预测的RMSE为0.650 TECu, MAPE为3.181%。
{"title":"Research on a Deep Learning Modeling Method of Ionospheric Total Electron Content","authors":"Yunsheng Ma, Liandong Dai, Xiao-Jing Hao, Zonghua Ding, Na Li","doi":"10.1109/ICESGE56040.2022.10180373","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180373","url":null,"abstract":"The current popular deep learning technology of artificial neural networks has been vigorously developed and gradually applied to space weather. Global total electron content (TEC) map data publicly provided by the International GNSS Service (IGS) are 71×73 grids with temporal resolution of 1 hour and spatial resolution of 5°×2.5°, which can be used as sufficient training samples for deep learning. Variation of TEC is closely related to solar activity and geomagnetic activity, so data sets for this article are created based on 2019–2020 TEC map data, as well as the hourly solar radiation index F107 and geomagnetic index Kp together with the corresponding time, and longitude and latitude of each parameter are introduced as supervision information. The long short-term memory (LSTM) network and the multilayer perceptron (MLP) in the deep learning method are used to build a 9-layer deep neural network for training and verification, so that the advantages of the “gate” mechanism of LSTM network in time series modeling and the advantages of MLP in comprehensive consideration and high reliability can be fully brought into play. 70% of data sets are divided into training sets and 30% for validation, which runs in CPU environment. Adam algorithm is used for optimization, and the batch size is set to 24. The training results show that the minimum RMSE is 0.249 TECu, and the maximum RMSE is 4.240 TECu. RMSE of one step prediction is 0.650 TECu, and MAPE is 3.181%.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127273811","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}
Pub Date : 2022-12-09DOI: 10.1109/ICESGE56040.2022.10180311
Naichao Song, Zhiyong Zhao, Ruiqi Wang, Mingming Li, Weijun Li, Zhao Chen, Yi Zhang, Cong Hei, Jiaming Yin, Ruiling Xi
This paper provides a distribution network fault diagnosis technology based on information fusion technology. Given the complex topology of the distribution network and redundant measurement data, it is difficult to obtain accurate fault diagnosis due to the complex fault mechanism. Therefore, it is proposed to fuse the electrical quantity in PMU (Phasor Measurement Unit) with the switching quantity in SCADA (Supervisory Control and Data Acquisition), and diagnose the fault of the distribution network through evidence fusion. MATLAB/Simulink simulation results show that the multi-source data fusion method can still accurately diagnose faults under the premise of fewer measurement points and has good fault tolerance and high accuracy.
提出了一种基于信息融合技术的配电网故障诊断技术。由于配电网拓扑结构复杂，测量数据冗余，故障机理复杂，难以获得准确的故障诊断。为此，提出将相量测量单元(PMU)中的电量与SCADA (Supervisory Control and Data Acquisition)中的开关量融合，通过证据融合诊断配电网的故障。MATLAB/Simulink仿真结果表明，多源数据融合方法在测量点较少的前提下仍能准确诊断故障，容错性好，精度高。
{"title":"Fault Diagnosis of Single-Phase Grounding Distribution Network Based on Multi-Source Data Fusion","authors":"Naichao Song, Zhiyong Zhao, Ruiqi Wang, Mingming Li, Weijun Li, Zhao Chen, Yi Zhang, Cong Hei, Jiaming Yin, Ruiling Xi","doi":"10.1109/ICESGE56040.2022.10180311","DOIUrl":"https://doi.org/10.1109/ICESGE56040.2022.10180311","url":null,"abstract":"This paper provides a distribution network fault diagnosis technology based on information fusion technology. Given the complex topology of the distribution network and redundant measurement data, it is difficult to obtain accurate fault diagnosis due to the complex fault mechanism. Therefore, it is proposed to fuse the electrical quantity in PMU (Phasor Measurement Unit) with the switching quantity in SCADA (Supervisory Control and Data Acquisition), and diagnose the fault of the distribution network through evidence fusion. MATLAB/Simulink simulation results show that the multi-source data fusion method can still accurately diagnose faults under the premise of fewer measurement points and has good fault tolerance and high accuracy.","PeriodicalId":120565,"journal":{"name":"2022 International Conference on Environmental Science and Green Energy (ICESGE)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125271821","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}
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