Pub Date : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783125
Honglin Lu, Debin Zhang, C. Qu, Zhongsong Zhang
Brushless Doubly-Fed Induction Generators (BDFIG) increase reliability and decrease maintenance cost because it removes the brushes and slip rings of the traditional Doubly-Fed Induction Generator (DFIG). It has a potential for wide application in power generation systems. Non-ideal characteristics such as symmetrical and asymmetrical dips in the grid voltage are inevitable in power generation systems. Running BDFIG in a non-ideal grid will produce low-order harmonic oscillation, which will cause the distortion in the winding voltage, resulting in serious overvoltage and overcurrent faults in motor winding, reducing the reliability of the entire power generation system. In order to provide more targeted protection for BDFIG under non-ideal grid operating conditions, this paper establishes the BDFIG model with the non-ideal power grid and analyzes its working characteristics. Firstly, establish the BDFIG model under the ideal grid and obtain the voltage characteristics of the control winding from analysis of when the power grid fails; Secondly, establish the BDFIG model under the non-ideal grid and analyze from two cases of balanced grid with low harmonic voltage and unbalanced grid with low harmonic voltage respectively. Thirdly, the relational equations of the positive and negative sequence components are derived respectively, which provides a theoretical basis for the control of positive and negative sequence components; Finally, the characteristics of BDFIG under non-ideal grid are simulated and verified by Matlab/Simulink.
{"title":"Modeling and Analysis of Brushless Doubly-Fed Induction Generators with Non-Ideal Grids","authors":"Honglin Lu, Debin Zhang, C. Qu, Zhongsong Zhang","doi":"10.1109/CEEPE55110.2022.9783125","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783125","url":null,"abstract":"Brushless Doubly-Fed Induction Generators (BDFIG) increase reliability and decrease maintenance cost because it removes the brushes and slip rings of the traditional Doubly-Fed Induction Generator (DFIG). It has a potential for wide application in power generation systems. Non-ideal characteristics such as symmetrical and asymmetrical dips in the grid voltage are inevitable in power generation systems. Running BDFIG in a non-ideal grid will produce low-order harmonic oscillation, which will cause the distortion in the winding voltage, resulting in serious overvoltage and overcurrent faults in motor winding, reducing the reliability of the entire power generation system. In order to provide more targeted protection for BDFIG under non-ideal grid operating conditions, this paper establishes the BDFIG model with the non-ideal power grid and analyzes its working characteristics. Firstly, establish the BDFIG model under the ideal grid and obtain the voltage characteristics of the control winding from analysis of when the power grid fails; Secondly, establish the BDFIG model under the non-ideal grid and analyze from two cases of balanced grid with low harmonic voltage and unbalanced grid with low harmonic voltage respectively. Thirdly, the relational equations of the positive and negative sequence components are derived respectively, which provides a theoretical basis for the control of positive and negative sequence components; Finally, the characteristics of BDFIG under non-ideal grid are simulated and verified by Matlab/Simulink.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128065878","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 : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783131
H. Ni, Zhonghua Xiang, Feiyue Ma, Wei Li, Qiang Wu, Yu Wang
Due to frequent action, AC filter (ACF) circuit breaker is more prone to abnormalities and faults than conventional line circuit breaker. For the 750kV AC voltage level in UHV converter station, the ACF circuit breaker is subjected to severe working conditions. This paper takes the 750kV ACF circuit breaker with pre-insertion resistor as the research object, takes a case of abnormal closing inrush current and a case of grounding fault as the research content, and inverts the process and cause of the fault through simulation analysis and disassembly inspection. According to the research of this paper, the effectiveness of simulation calculation in fault analysis can be verified, and the harm of pre-insertion resistor structure to filter bank circuit breaker is further clarified.
{"title":"Fault Simulation Research and Verification of 750 kV ACF Circuit Breaker with Pre-insertion Resistor Structure","authors":"H. Ni, Zhonghua Xiang, Feiyue Ma, Wei Li, Qiang Wu, Yu Wang","doi":"10.1109/CEEPE55110.2022.9783131","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783131","url":null,"abstract":"Due to frequent action, AC filter (ACF) circuit breaker is more prone to abnormalities and faults than conventional line circuit breaker. For the 750kV AC voltage level in UHV converter station, the ACF circuit breaker is subjected to severe working conditions. This paper takes the 750kV ACF circuit breaker with pre-insertion resistor as the research object, takes a case of abnormal closing inrush current and a case of grounding fault as the research content, and inverts the process and cause of the fault through simulation analysis and disassembly inspection. According to the research of this paper, the effectiveness of simulation calculation in fault analysis can be verified, and the harm of pre-insertion resistor structure to filter bank circuit breaker is further clarified.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128638814","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 : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783350
Wenchuan Sun, Diantao Shen, Yi Wang, Kai Huang, Bingzhen Niu, Yang Yu
In this paper, we studied the integrated data fusion terminal for distribution area operation and distribution based on edge calculation and software definition. Firstly, the overall architecture of the integrated data fusion terminal for distribution area operation and distribution was constructed, and the software and hardware of the terminal were comprehensively designed. Then, an edge data stream hierarchical storage algorithm and an edge computing resource allocation method based on Deep Deterministic Policy Gradient (DDPG) reinforcement learning algorithm were proposed. In order to meet the capability of edge computing, the resource utilization efficiency, running time and throughput efficiency of CPU were compared and analyzed. The optimal CPU chip was selecited to complete the optimal design of terminal control system. Finally, combined with the field, the terminal was applied. The functions of data monitoring, fault early warning, topology identification and distribution area line loss were realized, which meets the professional needs of marketing and production, reduces the investment cost of power grid equipment and improves the on-site maintenance efficiency.
{"title":"Research and Application of Integrated Data Fusion Terminal for Station Area Operation and Distribution Based on Edge Calculation and Software Definition","authors":"Wenchuan Sun, Diantao Shen, Yi Wang, Kai Huang, Bingzhen Niu, Yang Yu","doi":"10.1109/CEEPE55110.2022.9783350","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783350","url":null,"abstract":"In this paper, we studied the integrated data fusion terminal for distribution area operation and distribution based on edge calculation and software definition. Firstly, the overall architecture of the integrated data fusion terminal for distribution area operation and distribution was constructed, and the software and hardware of the terminal were comprehensively designed. Then, an edge data stream hierarchical storage algorithm and an edge computing resource allocation method based on Deep Deterministic Policy Gradient (DDPG) reinforcement learning algorithm were proposed. In order to meet the capability of edge computing, the resource utilization efficiency, running time and throughput efficiency of CPU were compared and analyzed. The optimal CPU chip was selecited to complete the optimal design of terminal control system. Finally, combined with the field, the terminal was applied. The functions of data monitoring, fault early warning, topology identification and distribution area line loss were realized, which meets the professional needs of marketing and production, reduces the investment cost of power grid equipment and improves the on-site maintenance efficiency.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131480719","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}
Power Internet of things measurement terminal device is a new type of information distribution network equipment. If all nodes in the distribution system are equipped with measuring devices, the state estimation problem will be greatly simplified, but this configuration method is difficult to achieve due to economic constraints, so it is necessary to study the optimal distribution scheme of measuring devices. This paper presents an optimized distribution scheme for new distribution measurement terminals, establishes the mathematical model of terminal distribution based on 0-1 integer programming, and formulates the principle and process of node configuration based on tree graph search technology. Based on the measurement characteristics of the Internet of things measurement terminal device applied to power distribution, the calculation methods to make the zero injection nodes and connected nodes observable in the network are deduced, and the terminal distribution methods suitable for large and small-scale systems are proposed. In order to meet the requirements of complete observability and economy of power distribution system, the proposed two methods are configured and compared in different common network architectures.
{"title":"Optimal Allocation of Real Time Measurement in Distribution Network Considering Network Observability","authors":"Zhensheng Wu, Deling Fan, Kemeng Li, Zhongliu Zhang","doi":"10.1109/CEEPE55110.2022.9783368","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783368","url":null,"abstract":"Power Internet of things measurement terminal device is a new type of information distribution network equipment. If all nodes in the distribution system are equipped with measuring devices, the state estimation problem will be greatly simplified, but this configuration method is difficult to achieve due to economic constraints, so it is necessary to study the optimal distribution scheme of measuring devices. This paper presents an optimized distribution scheme for new distribution measurement terminals, establishes the mathematical model of terminal distribution based on 0-1 integer programming, and formulates the principle and process of node configuration based on tree graph search technology. Based on the measurement characteristics of the Internet of things measurement terminal device applied to power distribution, the calculation methods to make the zero injection nodes and connected nodes observable in the network are deduced, and the terminal distribution methods suitable for large and small-scale systems are proposed. In order to meet the requirements of complete observability and economy of power distribution system, the proposed two methods are configured and compared in different common network architectures.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128904892","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 : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783292
Chengkai Shi, Gong Qingwui, Qin Liang
When conducting system-level research, it is unacceptable to adopt a detailed MMC electromagnetic transient model to bring about the amount of calculation. Although the use of electromechanical transient simulation and electromagnetic transient hybrid simulation technology or electromagnetic transient and dynamic phasor hybrid simulation technology can retain high simulation accuracy, it is not conducive to the model mechanism analysis and the control operation. In addition, the MMC average model is also used for AC and DC transient simulation. The average modeling uses controlled power sources to describe the average response of the converter, which can also be employed to the transient simulation. Due to the modeling properties of the ABC coordinate system, the average model is only suitable for time-domain simulation. The dynamic phasor modeling method employs the d−q axis coordinate system to analyze the MMC steady-state and research the small-signal stability. The order of each component in the d−q axis coordinate system model can be selected according to the required accuracy. Thus, the MMC dynamic phasor modeling scheme has widespread application in MMC-HVDC stability research, electromechanical transient simulation and controller design, etc. This article will establish an MMC dynamic phasor model to analyze the dynamic characteristics of system circulation.
{"title":"Dynamic Phasor Model of Modular Multilevel Converters High Voltage DC transmission","authors":"Chengkai Shi, Gong Qingwui, Qin Liang","doi":"10.1109/CEEPE55110.2022.9783292","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783292","url":null,"abstract":"When conducting system-level research, it is unacceptable to adopt a detailed MMC electromagnetic transient model to bring about the amount of calculation. Although the use of electromechanical transient simulation and electromagnetic transient hybrid simulation technology or electromagnetic transient and dynamic phasor hybrid simulation technology can retain high simulation accuracy, it is not conducive to the model mechanism analysis and the control operation. In addition, the MMC average model is also used for AC and DC transient simulation. The average modeling uses controlled power sources to describe the average response of the converter, which can also be employed to the transient simulation. Due to the modeling properties of the ABC coordinate system, the average model is only suitable for time-domain simulation. The dynamic phasor modeling method employs the d−q axis coordinate system to analyze the MMC steady-state and research the small-signal stability. The order of each component in the d−q axis coordinate system model can be selected according to the required accuracy. Thus, the MMC dynamic phasor modeling scheme has widespread application in MMC-HVDC stability research, electromechanical transient simulation and controller design, etc. This article will establish an MMC dynamic phasor model to analyze the dynamic characteristics of system circulation.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122325125","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 : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783416
Fei Gao, Liang Li, Jia Hu, Yu Zhang
This paper explores the effect of the shielding plate in the inductive power transfer (IPT) pads, and identify its impact on leakage magnetic field and pads losses. The 3-D finite-element analysis method is used to optimize the structure of the shielding plate. The shielding effectiveness is investigated in terms of thickness of the shielding plate, air-gap distance between the shielding plate and the ferrite plate, covering area and geometry of the shielding plate. The result shows that the shielding structure plays dominant role in leakage magnetic field and pad losses. By using the optimized shielding structure, both the leakage magnetic field in the vicinity of the WPT system and the power loss in the transmission pads are reduced, which provides a reference of shielding structure design for IPT systems.
{"title":"Research and Optimization of Shielding Structure for Inductive Power Transfer System","authors":"Fei Gao, Liang Li, Jia Hu, Yu Zhang","doi":"10.1109/CEEPE55110.2022.9783416","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783416","url":null,"abstract":"This paper explores the effect of the shielding plate in the inductive power transfer (IPT) pads, and identify its impact on leakage magnetic field and pads losses. The 3-D finite-element analysis method is used to optimize the structure of the shielding plate. The shielding effectiveness is investigated in terms of thickness of the shielding plate, air-gap distance between the shielding plate and the ferrite plate, covering area and geometry of the shielding plate. The result shows that the shielding structure plays dominant role in leakage magnetic field and pad losses. By using the optimized shielding structure, both the leakage magnetic field in the vicinity of the WPT system and the power loss in the transmission pads are reduced, which provides a reference of shielding structure design for IPT systems.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"14 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120822256","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 : 2022-04-22DOI: 10.1109/CEEPE55110.2022.9783339
Xiangwu Yan, Hang Zhang, Chenguang Wang, Jiaoxin Jia, Baixue Liang, Wanjun Deng
With the continuous increase of photovoltaic (PV) penetration rate in the grid, the frequency modulation capability decreases and inertia is insufficient. In order to reduce the adverse effects of high permeability of PV, the power system has put forward relevant requirements for PV to participate in peak and frequency modulation. A method to solve the problem of PV peak and frequency modulation is to use Flexible Power Point Tracking (FPPT) strategy which is photovoltaic power generation system (PVPGS) operates below the maximum Power Point, with active Power reserve. Most of FPPT strategies operates in the right-sides of Photovoltaic system, instead of the left-side. However, the right-sides operation mode has its defects, and the left-sides operation mode has its advantages. In this paper, the FPPT strategy of photovoltaic power generation system is classified and briefly described, and the tracking performance of FPPT strategy in different working conditions is studied, and its principles are analyzed, which provides a benchmark for researchers and engineers to choose suitable FPPT operation mode for specific applications. The simulation results show that the PVPGS is more stable when running on the left side of the photovoltaic characteristic curve, while it is difficult to give consideration to the corresponding dynamic speed and steady-state accuracy when running on the right side. The single-stage PV system have the problem of power reverse peak when running on the left side of the PV characteristic curve.
{"title":"A Comparative Study of Flexible Power Point Tracking Strategies Operating at Left and Right Sides of Photovoltaic Systems","authors":"Xiangwu Yan, Hang Zhang, Chenguang Wang, Jiaoxin Jia, Baixue Liang, Wanjun Deng","doi":"10.1109/CEEPE55110.2022.9783339","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783339","url":null,"abstract":"With the continuous increase of photovoltaic (PV) penetration rate in the grid, the frequency modulation capability decreases and inertia is insufficient. In order to reduce the adverse effects of high permeability of PV, the power system has put forward relevant requirements for PV to participate in peak and frequency modulation. A method to solve the problem of PV peak and frequency modulation is to use Flexible Power Point Tracking (FPPT) strategy which is photovoltaic power generation system (PVPGS) operates below the maximum Power Point, with active Power reserve. Most of FPPT strategies operates in the right-sides of Photovoltaic system, instead of the left-side. However, the right-sides operation mode has its defects, and the left-sides operation mode has its advantages. In this paper, the FPPT strategy of photovoltaic power generation system is classified and briefly described, and the tracking performance of FPPT strategy in different working conditions is studied, and its principles are analyzed, which provides a benchmark for researchers and engineers to choose suitable FPPT operation mode for specific applications. The simulation results show that the PVPGS is more stable when running on the left side of the photovoltaic characteristic curve, while it is difficult to give consideration to the corresponding dynamic speed and steady-state accuracy when running on the right side. The single-stage PV system have the problem of power reverse peak when running on the left side of the PV characteristic curve.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132410099","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}
Internet of Things technology is one of the basic support technologies for the construction of smart grid, digital grid and even new power system. Due to the complexity and diversity of communication protocols at each layer of the Power Internet of Things, it brings difficulties in connectivity and adaptability to the construction, operation and maintenance of the power Internet of Things. Based on analytic hierarchy process and bayesian maximum fusion method to build an application layer communication protocol adaptability evaluation model, set up power communication architecture of Internet of things, adaptability, flexibility, adaptability, network platform through business economic adaptability and security adaptive five aspect analysis, the quantitative evaluation of communication protocol adaptation. The evaluation method combines subjective and objective requirements and can provide reference for the construction of power Internet of Things communication platform.
{"title":"Research on Communication Protocol Adaptability of Power Internet of Things Application Layer","authors":"Jian Gao, Jianmin Pang, Ganghong Zhang, Chao Huo, Jianan Yuan, Zhibin Yin","doi":"10.1109/CEEPE55110.2022.9783265","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783265","url":null,"abstract":"Internet of Things technology is one of the basic support technologies for the construction of smart grid, digital grid and even new power system. Due to the complexity and diversity of communication protocols at each layer of the Power Internet of Things, it brings difficulties in connectivity and adaptability to the construction, operation and maintenance of the power Internet of Things. Based on analytic hierarchy process and bayesian maximum fusion method to build an application layer communication protocol adaptability evaluation model, set up power communication architecture of Internet of things, adaptability, flexibility, adaptability, network platform through business economic adaptability and security adaptive five aspect analysis, the quantitative evaluation of communication protocol adaptation. The evaluation method combines subjective and objective requirements and can provide reference for the construction of power Internet of Things communication platform.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130823657","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 breakdown accidents of cable outer sheath and sheath voltage limiters frequently occur due to the unreasonable sheath bonding design. Unlike pure cable lines, the sheath voltage of hybrid overhead-cable lines could exceed the power frequency withstand voltage of outer-sheath under some circumstances. Its amplitude is closely related to the earth potential rise at the connection point of overhead lines and cables. This paper employed PSCAD-EMTDC to study the power frequency sheath overvoltage of a hybrid overhead-cable line type in the case of single-phase-to-ground fault of the overhead line terminal, where the overhead line was inserted between the cable lines applied with various sheath bonding methods. And the influence of the grounding resistance of the terminal tower and the earth continuity cable on the sheath induced voltage was also discussed. Simulation results indicated that, the earth potential rise and sheath voltage of single-point bonded cables exceed 25 kV in serious cases. Compared with the cables with sheath single-point bonded, the earth potential rise at the connection point was much lower, below 10 kV, when the overhead line was connected to the cables with sheath cross-bonded, and the grounding resistance of the terminal tower had little influence on the earth potential rise. Besides, the installation of earth continuity conductor had a markedly positive effect on the power frequency withstand performance of cable outer-sheath and sheath voltage limiters for this hybrid line type.
{"title":"Study on Sheath Voltage and Earth Potential Rises of the Hybrid Overhead-cable Lines","authors":"Qiming Gong, Kunlin Li, Jiankang Zheng, Yuqian Sheng, Shaobin Li, Yang Xu","doi":"10.1109/CEEPE55110.2022.9783290","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783290","url":null,"abstract":"The breakdown accidents of cable outer sheath and sheath voltage limiters frequently occur due to the unreasonable sheath bonding design. Unlike pure cable lines, the sheath voltage of hybrid overhead-cable lines could exceed the power frequency withstand voltage of outer-sheath under some circumstances. Its amplitude is closely related to the earth potential rise at the connection point of overhead lines and cables. This paper employed PSCAD-EMTDC to study the power frequency sheath overvoltage of a hybrid overhead-cable line type in the case of single-phase-to-ground fault of the overhead line terminal, where the overhead line was inserted between the cable lines applied with various sheath bonding methods. And the influence of the grounding resistance of the terminal tower and the earth continuity cable on the sheath induced voltage was also discussed. Simulation results indicated that, the earth potential rise and sheath voltage of single-point bonded cables exceed 25 kV in serious cases. Compared with the cables with sheath single-point bonded, the earth potential rise at the connection point was much lower, below 10 kV, when the overhead line was connected to the cables with sheath cross-bonded, and the grounding resistance of the terminal tower had little influence on the earth potential rise. Besides, the installation of earth continuity conductor had a markedly positive effect on the power frequency withstand performance of cable outer-sheath and sheath voltage limiters for this hybrid line type.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116841558","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 continuous exploration and innovative application of smart medical scenarios is the general trend of the development of modern medicine. Smart pharmacy is an important aspect of it. To improve the level of hospital medical service facilities and automated service capabilities, this paper starts with the delivery of medicines in hospitals, takes MSP430F5529 main control board [1]–[3] as the control core, combined with TB6612FNG DC motor drive module, Hall incremental encoder motor, OLED display module, power module, BT18 Bluetooth communication module, five-way grayscale sensor [4]–[7] module and other functional modules, an intelligent drug delivery vehicle is designed. This paper expounds on the designed intelligent drug delivery vehicle from function introduction and working principle aspects. We make a simple version of the intelligent drug delivery vehicle by itself and conduct drug distribution simulation experiments and performance tests to verify the feasibility of the vehicle design.
{"title":"Design of Intelligent Drug Delivery Vehicle Based on MSP430 MCU","authors":"Shan Xinzheng, Xue Luyan, Wu Wancheng, Liao Xiaoyu, Nan Tianqi, Wu Yichen","doi":"10.1109/CEEPE55110.2022.9783264","DOIUrl":"https://doi.org/10.1109/CEEPE55110.2022.9783264","url":null,"abstract":"The continuous exploration and innovative application of smart medical scenarios is the general trend of the development of modern medicine. Smart pharmacy is an important aspect of it. To improve the level of hospital medical service facilities and automated service capabilities, this paper starts with the delivery of medicines in hospitals, takes MSP430F5529 main control board [1]–[3] as the control core, combined with TB6612FNG DC motor drive module, Hall incremental encoder motor, OLED display module, power module, BT18 Bluetooth communication module, five-way grayscale sensor [4]–[7] module and other functional modules, an intelligent drug delivery vehicle is designed. This paper expounds on the designed intelligent drug delivery vehicle from function introduction and working principle aspects. We make a simple version of the intelligent drug delivery vehicle by itself and conduct drug distribution simulation experiments and performance tests to verify the feasibility of the vehicle design.","PeriodicalId":118143,"journal":{"name":"2022 5th International Conference on Energy, Electrical and Power Engineering (CEEPE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134634207","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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