Pub Date : 2024-10-21DOI: 10.1109/TASC.2024.3484329
Meng Xiao;Zhiyuan Zhang;Boxue Du;Bin Wang;Jianmei Cao
In this paper, the surface grafting and crosslinking modification method is proposed for enhancing the dielectric properties of polypropylene (PP) films for metalized film capacitors (MFCs). The results indicate that the leakage conductivity of the modified film is 1.05 × 10 −16 S/m, exhibiting better resistance characteristics. The DC breakdown strength could reach 625.2 kV/mm, marking a notable 14.8% increase compared to the pure PP film. The surface grafting could lead to charge concentration at the electrode/film interface, which weakens the interfacial electric field and inhibits charge injection. Furthermore, the crosslinking reaction could enhance the entanglement of macromolecular chains, thereby changing the crystal morphology of PP and decreasing the migration rate of carriers. This method improves the dielectric properties of the capacitor film from the perspective of charge transport.
{"title":"Enhanced Dielectric Performance of Polypropylene Film by Surfacing Grafting and Crosslinking for Metalized Film Capacitors","authors":"Meng Xiao;Zhiyuan Zhang;Boxue Du;Bin Wang;Jianmei Cao","doi":"10.1109/TASC.2024.3484329","DOIUrl":"https://doi.org/10.1109/TASC.2024.3484329","url":null,"abstract":"In this paper, the surface grafting and crosslinking modification method is proposed for enhancing the dielectric properties of polypropylene (PP) films for metalized film capacitors (MFCs). The results indicate that the leakage conductivity of the modified film is 1.05 × 10\u0000<sup>−16</sup>\u0000 S/m, exhibiting better resistance characteristics. The DC breakdown strength could reach 625.2 kV/mm, marking a notable 14.8% increase compared to the pure PP film. The surface grafting could lead to charge concentration at the electrode/film interface, which weakens the interfacial electric field and inhibits charge injection. Furthermore, the crosslinking reaction could enhance the entanglement of macromolecular chains, thereby changing the crystal morphology of PP and decreasing the migration rate of carriers. This method improves the dielectric properties of the capacitor film from the perspective of charge transport.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-21DOI: 10.1109/TASC.2024.3484334
Meng Xiao;Liangtian Zhang;Xiaodan Du;Duoqing Zhao;Bo Xue Du
Metallized film capacitors (MFCs) is the essential components of the superconducting magnetic energy storage (SMES) system. In this paper, a polymer insulation film partial discharge(PD) experimental system is established to explore the PD characteristics of biaxially oriented polypropylene (BOPP) and metallized films based on the simulation of insulation defects formed after the self-healing in MFCs. As the size and quantity of defects increase, the distortion of the electric field intensifies, thereby facilitating the occurrence of PD. However, the PD amplitude of the metallized film decreased by about 10%. The PD of BOPP films is mainly internal discharge. The metallized film initially occurs surface discharge. With the applied voltage increasing, the intensity of internal discharge amplifies. Self-healing and PD will cause the loss of electrodes, leading to the degradation in capacitor performance. The difference in PD characteristics between BOPP and metallized films is attributed to the excellent conductivity of the metallized film surface. This property promotes diffusion and combination of the space charge, while reducing the accumulation of charges in the defects. Thus the electric field distortion is reduced, which makes PD more difficult to occur and less intensive.
{"title":"Study on Partial Discharge Characteristics of Metallized Film Following Self-Healing in Power Capacitors","authors":"Meng Xiao;Liangtian Zhang;Xiaodan Du;Duoqing Zhao;Bo Xue Du","doi":"10.1109/TASC.2024.3484334","DOIUrl":"https://doi.org/10.1109/TASC.2024.3484334","url":null,"abstract":"Metallized film capacitors (MFCs) is the essential components of the superconducting magnetic energy storage (SMES) system. In this paper, a polymer insulation film partial discharge(PD) experimental system is established to explore the PD characteristics of biaxially oriented polypropylene (BOPP) and metallized films based on the simulation of insulation defects formed after the self-healing in MFCs. As the size and quantity of defects increase, the distortion of the electric field intensifies, thereby facilitating the occurrence of PD. However, the PD amplitude of the metallized film decreased by about 10%. The PD of BOPP films is mainly internal discharge. The metallized film initially occurs surface discharge. With the applied voltage increasing, the intensity of internal discharge amplifies. Self-healing and PD will cause the loss of electrodes, leading to the degradation in capacitor performance. The difference in PD characteristics between BOPP and metallized films is attributed to the excellent conductivity of the metallized film surface. This property promotes diffusion and combination of the space charge, while reducing the accumulation of charges in the defects. Thus the electric field distortion is reduced, which makes PD more difficult to occur and less intensive.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-21DOI: 10.1109/TASC.2024.3484333
Nan Chen;Shuhua Fang
This article proposes an innovative flux modulated permanent magnet (PM) arc motor enhanced with flux-concentrated stator PMs (FCS-FMPMAM). With the primary goal of increasing the average torque output, the FCS-FMPMAM incorporates a set of flux-focused stator PMs. This article initially introduces the configuration and performance of the FCS-FMPMAM. The combination of the flux-switching PMs, consequent-pole PMs and PMs in the stator yoke is beneficial to generate abundant harmonics and bolster the triple flux-modulation effect. Then, the optimal rotor pole number of the proposed machine is analyzed and selected. The sensitivity analysis is performed on the design parameters of FCS-FMPMAM for the consequent optimization of the torque performance of FCS-FMPMAM. This facilitates the subsequent torque performance optimization of FSC-FMPMAM. Based on the multi-objective evolutionary algorithm, the torque capabilities of FCS-FMPMAM are optimized to obtain the maximized average torque output and the minimized torque ripple. The optimized machine is analyzed under different PM excitation conditions to reveal the superiority of the proposed PM arrangement. Finally, the proposed machine is compared with an existing flux-modulated stator-PM arc motor in electromagnetic performances with finite element analysis method to exhibit the superiority of FCS-FMPMAM.
{"title":"Design and Investigation of a New Torque-Enhanced Flux Modulated Permanent Magnet Arc Motor With Flux-Concentrated Stator PMs","authors":"Nan Chen;Shuhua Fang","doi":"10.1109/TASC.2024.3484333","DOIUrl":"https://doi.org/10.1109/TASC.2024.3484333","url":null,"abstract":"This article proposes an innovative flux modulated permanent magnet (PM) arc motor enhanced with flux-concentrated stator PMs (FCS-FMPMAM). With the primary goal of increasing the average torque output, the FCS-FMPMAM incorporates a set of flux-focused stator PMs. This article initially introduces the configuration and performance of the FCS-FMPMAM. The combination of the flux-switching PMs, consequent-pole PMs and PMs in the stator yoke is beneficial to generate abundant harmonics and bolster the triple flux-modulation effect. Then, the optimal rotor pole number of the proposed machine is analyzed and selected. The sensitivity analysis is performed on the design parameters of FCS-FMPMAM for the consequent optimization of the torque performance of FCS-FMPMAM. This facilitates the subsequent torque performance optimization of FSC-FMPMAM. Based on the multi-objective evolutionary algorithm, the torque capabilities of FCS-FMPMAM are optimized to obtain the maximized average torque output and the minimized torque ripple. The optimized machine is analyzed under different PM excitation conditions to reveal the superiority of the proposed PM arrangement. Finally, the proposed machine is compared with an existing flux-modulated stator-PM arc motor in electromagnetic performances with finite element analysis method to exhibit the superiority of FCS-FMPMAM.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-14DOI: 10.1109/TASC.2024.3469848
Sadia Afrin;Shuvra Prokash Biswas;Sudipto Mondal;Md. Rabiul Islam;Rakibuzzaman Shah
Pulsewidth modulation (PWM) techniques play a crucial role in determining the power quality of multilevel-inverter-based grid-tied solar photovoltaic (PV) fed systems. However, the existing PWM techniques suffer from the heat dissipation of the switches and power loss issues. In view of this concern, a new PWM technique is proposed to mitigate the junction temperature as well as the power loss of a cascaded H-bridge (CHB) inverter employed in a grid-tied solar PV system. Apart from the junction temperature of the power switch and power loss, different steady-state and dynamic responses of the CHB inverter are investigated using MATLAB/Simulink and PLECS software environments. Experimental results are also provided to support the simulation analysis.
{"title":"Improved PWM Switching Scheme to Mitigate Power Loss and Switch Temperature of CHB Inverters","authors":"Sadia Afrin;Shuvra Prokash Biswas;Sudipto Mondal;Md. Rabiul Islam;Rakibuzzaman Shah","doi":"10.1109/TASC.2024.3469848","DOIUrl":"https://doi.org/10.1109/TASC.2024.3469848","url":null,"abstract":"Pulsewidth modulation (PWM) techniques play a crucial role in determining the power quality of multilevel-inverter-based grid-tied solar photovoltaic (PV) fed systems. However, the existing PWM techniques suffer from the heat dissipation of the switches and power loss issues. In view of this concern, a new PWM technique is proposed to mitigate the junction temperature as well as the power loss of a cascaded H-bridge (CHB) inverter employed in a grid-tied solar PV system. Apart from the junction temperature of the power switch and power loss, different steady-state and dynamic responses of the CHB inverter are investigated using MATLAB/Simulink and PLECS software environments. Experimental results are also provided to support the simulation analysis.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-14DOI: 10.1109/TASC.2024.3480034
Deming Huang;Chaoqun Jiao;Jin Fang
To address the issues of high energy consumption, coil heating, and narrow suspension gap in traditional electromagnetic suspension (EMS) systems, a novel electromagnetic core structure—inverted E-shaped—is introduced. The second-generation high-temperature superconducting tape is employed to provide the primary suspension force, while normal conductance aluminum coils are utilized for regulating force. Based on finite-element simulation, a comparison is made between the suspension force and the suspension gap of hybrid and traditional suspension systems. An equivalent magnetic circuit model for the hybrid system is established, along with its corresponding solution flow. The proportional–integral–derivative control parameters of the suspension system are designed and simulated to verify their accuracy. This novel suspension structure exhibits less energy consumption and a large suspension gap and reduces wireless coil heating issues, thereby providing valuable guidance for the development of high-speed EMS maglev trains.
为了解决传统电磁悬架（EMS）系统能耗高、线圈发热和悬架间隙窄等问题，我们引入了一种新型电磁核心结构--倒 E 型。采用第二代高温超导带提供主悬挂力，同时利用常导铝线圈调节力。在有限元模拟的基础上，对混合悬挂系统和传统悬挂系统的悬挂力和悬挂间隙进行了比较。建立了混合系统的等效磁路模型及其相应的求解流程。设计了悬挂系统的比例-积分-派生控制参数，并通过仿真验证了其准确性。这种新型悬挂结构能耗低、悬挂间隙大，减少了无线线圈发热问题，从而为高速 EMS 磁悬浮列车的开发提供了有价值的指导。
{"title":"Design of an Electromagnetic Suspension System Based on a New Type of High-Temperature Superconducting and Normal Conducting Hybrid Electromagnet","authors":"Deming Huang;Chaoqun Jiao;Jin Fang","doi":"10.1109/TASC.2024.3480034","DOIUrl":"https://doi.org/10.1109/TASC.2024.3480034","url":null,"abstract":"To address the issues of high energy consumption, coil heating, and narrow suspension gap in traditional electromagnetic suspension (EMS) systems, a novel electromagnetic core structure—inverted E-shaped—is introduced. The second-generation high-temperature superconducting tape is employed to provide the primary suspension force, while normal conductance aluminum coils are utilized for regulating force. Based on finite-element simulation, a comparison is made between the suspension force and the suspension gap of hybrid and traditional suspension systems. An equivalent magnetic circuit model for the hybrid system is established, along with its corresponding solution flow. The proportional–integral–derivative control parameters of the suspension system are designed and simulated to verify their accuracy. This novel suspension structure exhibits less energy consumption and a large suspension gap and reduces wireless coil heating issues, thereby providing valuable guidance for the development of high-speed EMS maglev trains.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-8"},"PeriodicalIF":1.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-14DOI: 10.1109/TASC.2024.3479796
Meng Xiao;Yuyan Chen;B. X. Du;Sihua Liu;Li Wan
In this paper, a method based on irradiation cross-linking modification and crystallization regulation is proposed to improve the dielectric properties of polypropylene (PP) films. Sorbitol nucleating agent DMDBS with different contents is added during the preparation of cross-linked PP film to investigate the influence of nucleating agents on cross-linking modification. The results show that the cross-linked structure restricts the carrier migration behavior under the electric field, leading to a decrease in the conductivity. The doping of nucleating agents increased the nucleation density and the cross-linking degree of the PP films, thus further improving their insulating properties. The cross-linking degree of PP film doped with 0.05 wt% DMDBS is increased to 20.16%. The conductivity was decreased by 36.8%, and the breakdown strength was improved by 18.3% in contrast to pure PP film. The paper provides practical experience for the enhancement of insulating properties of PP films for capacitors.
{"title":"Crystallization Regulation of Cross-Linking Polypropylene on Dielectric Performance for Capacitors in SMES","authors":"Meng Xiao;Yuyan Chen;B. X. Du;Sihua Liu;Li Wan","doi":"10.1109/TASC.2024.3479796","DOIUrl":"https://doi.org/10.1109/TASC.2024.3479796","url":null,"abstract":"In this paper, a method based on irradiation cross-linking modification and crystallization regulation is proposed to improve the dielectric properties of polypropylene (PP) films. Sorbitol nucleating agent DMDBS with different contents is added during the preparation of cross-linked PP film to investigate the influence of nucleating agents on cross-linking modification. The results show that the cross-linked structure restricts the carrier migration behavior under the electric field, leading to a decrease in the conductivity. The doping of nucleating agents increased the nucleation density and the cross-linking degree of the PP films, thus further improving their insulating properties. The cross-linking degree of PP film doped with 0.05 wt% DMDBS is increased to 20.16%. The conductivity was decreased by 36.8%, and the breakdown strength was improved by 18.3% in contrast to pure PP film. The paper provides practical experience for the enhancement of insulating properties of PP films for capacitors.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-07DOI: 10.1109/TASC.2024.3475949
Stavros P. Filippidis;Theodoros Theodoulidis;Aggelos S. Bouhouras;Antonio Morandi;Georgios C. Christoforidis
Superconducting solenoidal magnets are employed in magnetic resonance imaging and superconducting magnetic energy storage systems. Numerical methods are mandatory to optimize their design and predict their performance. Implementing the finite-element method (FEM) on the actual geometry of a high-temperature superconductor (HTS) tape is challenging due to the large aspect ratio of the tape, which creates meshing difficulties. In this article, we address this challenge by developing a custom FEM framework tailored specifically for this application, with a focus on speed and easy integration into optimization algorithms. A novel approach is adopted, representing the geometry of a coil-turn of HTS tape using a single point on the 2D plane. Each point corresponds to a matrix, serving both as an algebraic storage medium and the geometrical representation of the tape. The matrix cells possess imaginary dimensions that form the geometry of the coil-turn, eliminating the need for traditional meshing. The code of the framework is optimized to increase efficiency and utilize multiple cores of the processor. Results are compared with those obtained from COMSOL, verifying the framework's accuracy. A large magnet is designed to assess the computation efficiency. The successful application of this custom FEM framework in optimization routines opens new pathways for designing and predicting the performance of superconducting solenoidal magnets.
{"title":"A Custom Finite-Element Method Framework for Designing Superconducting Solenoidal Magnets and Coils With True HTS Tape Geometry","authors":"Stavros P. Filippidis;Theodoros Theodoulidis;Aggelos S. Bouhouras;Antonio Morandi;Georgios C. Christoforidis","doi":"10.1109/TASC.2024.3475949","DOIUrl":"https://doi.org/10.1109/TASC.2024.3475949","url":null,"abstract":"Superconducting solenoidal magnets are employed in magnetic resonance imaging and superconducting magnetic energy storage systems. Numerical methods are mandatory to optimize their design and predict their performance. Implementing the finite-element method (FEM) on the actual geometry of a high-temperature superconductor (HTS) tape is challenging due to the large aspect ratio of the tape, which creates meshing difficulties. In this article, we address this challenge by developing a custom FEM framework tailored specifically for this application, with a focus on speed and easy integration into optimization algorithms. A novel approach is adopted, representing the geometry of a coil-turn of HTS tape using a single point on the 2D plane. Each point corresponds to a matrix, serving both as an algebraic storage medium and the geometrical representation of the tape. The matrix cells possess imaginary dimensions that form the geometry of the coil-turn, eliminating the need for traditional meshing. The code of the framework is optimized to increase efficiency and utilize multiple cores of the processor. Results are compared with those obtained from COMSOL, verifying the framework's accuracy. A large magnet is designed to assess the computation efficiency. The successful application of this custom FEM framework in optimization routines opens new pathways for designing and predicting the performance of superconducting solenoidal magnets.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 9","pages":"1-11"},"PeriodicalIF":1.7,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-07DOI: 10.1109/TASC.2024.3465368
Yi Li;Yanfeng Lu;Kaixin Wu;Yuan Fang;Chaodan Zheng;Jiangang Zhang
This paper presents an intelligent inspection system for power insulators, integrating automous aerial vehicles (AAV) to address complex conditions. A novel image enhancement technique, based on the multi-scale Retinex algorithm with combined illumination correction and compensation, is proposed to enhance both the overall image quality of insulators and the visual perception for human observers. The study employs the state-of-the-art YOLOv7 target detector for automated identification of insulator defects. The YOLOv7 model undergoes further optimization, enhancing the feature extraction structure, incorporating the SE attention mechanism, and refining the loss function. These modifications enable the model to adapt to more intricate intelligent inspection tasks related to transmission line insulators, resulting in improved efficiency and detection accuracy. Building on this research out-comes, our team introduces an intelligent power insulator detection software system tailored for AAV inspection scenarios.
本文介绍了一种电力绝缘子智能检测系统，该系统集成了自动飞行器（AAV），可应对复杂的条件。本文提出了一种基于多尺度 Retinex 算法的新型图像增强技术，该算法结合了光照校正和补偿，可同时提高绝缘子的整体图像质量和人类观察者的视觉感知能力。研究采用了最先进的 YOLOv7 目标检测器来自动识别绝缘体缺陷。YOLOv7 模型经过进一步优化，增强了特征提取结构，纳入了 SE 注意机制，并完善了损失函数。这些修改使模型能够适应与输电线路绝缘子相关的更复杂的智能检测任务，从而提高效率和检测精度。在此研究成果的基础上，我们的团队推出了针对 AAV 检测场景的智能电力绝缘子检测软件系统。
{"title":"Intelligent Inspection System for Power Insulators Based on AAV on Complex Weather Conditions","authors":"Yi Li;Yanfeng Lu;Kaixin Wu;Yuan Fang;Chaodan Zheng;Jiangang Zhang","doi":"10.1109/TASC.2024.3465368","DOIUrl":"https://doi.org/10.1109/TASC.2024.3465368","url":null,"abstract":"This paper presents an intelligent inspection system for power insulators, integrating automous aerial vehicles (AAV) to address complex conditions. A novel image enhancement technique, based on the multi-scale Retinex algorithm with combined illumination correction and compensation, is proposed to enhance both the overall image quality of insulators and the visual perception for human observers. The study employs the state-of-the-art YOLOv7 target detector for automated identification of insulator defects. The YOLOv7 model undergoes further optimization, enhancing the feature extraction structure, incorporating the SE attention mechanism, and refining the loss function. These modifications enable the model to adapt to more intricate intelligent inspection tasks related to transmission line insulators, resulting in improved efficiency and detection accuracy. Building on this research out-comes, our team introduces an intelligent power insulator detection software system tailored for AAV inspection scenarios.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The considerable size and intricacy of high-power transformers frequently lead to inefficiency in finite element simulation analysis. To promptly and accurately estimate the stress state of the winding, this paper presents a theoretical approach to analyze the bending stress for each conductor in the inner winding of the transformer. Firstly, this approach takes into account the influences of conductor leakage flux and radial force as they vary with the radial position of the conductor. Subsequently, a 40000 kVA/110 kV transformer is adopted as a prototype, and the turn-to-turn winding model is constructed. The proposed analytical model is verified using 3D finite element method (FEM) simulations. Finally, a leakage flux test was conducted on the prototype, and the simulation and experimental results confirmed the validity of the proposed method.
{"title":"A Methodology to Evaluate the Radial Bending Stress of Transformer Inner Windings Based on the Turn-to-Turn Model","authors":"Xiongbo Wang;Yan Li;Zhanyang Yu;Peng Li;Zhengyu Xu","doi":"10.1109/TASC.2024.3469850","DOIUrl":"https://doi.org/10.1109/TASC.2024.3469850","url":null,"abstract":"The considerable size and intricacy of high-power transformers frequently lead to inefficiency in finite element simulation analysis. To promptly and accurately estimate the stress state of the winding, this paper presents a theoretical approach to analyze the bending stress for each conductor in the inner winding of the transformer. Firstly, this approach takes into account the influences of conductor leakage flux and radial force as they vary with the radial position of the conductor. Subsequently, a 40000 kVA/110 kV transformer is adopted as a prototype, and the turn-to-turn winding model is constructed. The proposed analytical model is verified using 3D finite element method (FEM) simulations. Finally, a leakage flux test was conducted on the prototype, and the simulation and experimental results confirmed the validity of the proposed method.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-03DOI: 10.1109/TASC.2024.3474304
Sudipto Mondal;Nazmul Islam Nahin;Shuvra Prokash Biswas;Anas Bin Islam;Md. Rabiul Islam;Afef Fekih;Mohua Biswas
Transformerless grid-connected inverters are gaining popularity due to their high efficiency, compact design, and cost-effectiveness than transformer-based inverters. However, these inverters face significant challenges, particularly leakage current and limited voltage boost capability. This paper presents a novel solution to these issues through a five-level transformerless inverter (TLI) topology utilizing switched capacitors (SCs). The inverter utilizes seven insulated gate bipolar transistors (IGBTs), two diodes, and two SCs to achieve a five-level boosted output while ensuring low leakage current. Near-zero leakage current is enabled by maintaining a constant common mode voltage (CMV). Finite control set model predictive control (FCS-MPC), instead of traditional modulators, facilitates grid current tracking and reduced current harmonics. The use of only seven switches and two SCs results in increased efficiency and reduced losses. Comprehensive MATLAB/Simulink simulations and an experimental prototype validate the effectiveness of the proposed TLI for solar PV integration.
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