Iet Electric Power Applications最新文献_第2页

On the relation between performance and permanent demagnetisation in spoke type machines with ferrite magnets 使用铁氧体磁铁的轮辐式机器的性能与永久退磁之间的关系

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-31 DOI: 10.1049/elp2.12448

Marcelo D. Silva, Sandra Eriksson

{"title":"On the relation between performance and permanent demagnetisation in spoke type machines with ferrite magnets","authors":"Marcelo D. Silva, Sandra Eriksson","doi":"10.1049/elp2.12448","DOIUrl":"https://doi.org/10.1049/elp2.12448","url":null,"abstract":"The use of rare earth elements (REE) in permanent magnets (PMs) raises problems in several domains. The supply chain of these is fragile, the prices have shown volatility and its manufacturing has a bigger impact on climate change when compared to the manufacturing of other PMs. Instead, ferrite PMs have been researched as an alternative. This alternative shows a relatively higher demagnetisation risk when compared to REE PMs. Thus, a detailed study on permanent demagnetisation during winding faults is crucial. The authors use the finite element method to evaluate different machine designs, developed under mechanical constraints, and explore several strategies to mitigate permanent demagnetisation. Also, the importance of avoiding permanent demagnetisation is changed gradually in the optimisation process. The results show that the protection of the PM and performance optimisation are irreconcilable goals. It also highlights the impact of the stator design in decreasing demagnetisation. Additionally, it is shown that the classic notion of avoiding demagnetisation is an ineffective strategy for designing high-performance machines with ferrite magnets, and instead, it should be integrated into the optimisation process and weighted according to the application demands.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12448","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Turn-to-turn and phase-to-phase short circuit fault detection of wind turbine permanent magnet generator based on equivalent magnetic network modelling by wavelet transform approach 基于小波变换方法等效磁网络建模的风力涡轮永磁发电机匝间和相间短路故障检测

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-30 DOI: 10.1049/elp2.12452

Mehrage Ghods, Zabihollah Tabarniarami, Jawad Faiz, Mohammad Amin Bazrafshan

{"title":"Turn-to-turn and phase-to-phase short circuit fault detection of wind turbine permanent magnet generator based on equivalent magnetic network modelling by wavelet transform approach","authors":"Mehrage Ghods, Zabihollah Tabarniarami, Jawad Faiz, Mohammad Amin Bazrafshan","doi":"10.1049/elp2.12452","DOIUrl":"https://doi.org/10.1049/elp2.12452","url":null,"abstract":"One of the most common faults in electric machines is a turn-to-turn short circuit (TTSC), which may destroy coil insulation and demagnetise the magnet. In addition, the phase-to-phase short circuit (PPSC) fault, which can have even more destructive effects than the TTSC fault, is introduced and analysed. The equivalent magnetic network (EMN) method, with high modelling accuracy and a short computation time, is employed for healthy and faulty machines. The current signal under fault conditions is analysed in the dqo frame, showing the presence of the second harmonic component in its waveform. This fault detection index is processed using the signal processing technique of discrete(wavelet transform (DWT). Besides, energy analysis is used to distinguish TTSC and PPSC faults. Finally, finite element and EMN modelling results are compared with the experimental data of the prototyped permanent magnet generator. The results show that the combination of the proposed EMN method and DWT has very good accuracy and speed. Furthermore, the proposed fault detection method remains unaffected by various linear loads with different power factors.The cover image is based on the article Turn-to-turn and phase-to-phase short circuit fault detection of wind turbine permanent magnet generator based on equivalent magnetic network modelling by wavelet transform approach by Mehrage Ghods et al., https://doi.org/10.1049/elp2.12452","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12452","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142273207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast and accurate methodologies for the eddy current losses analysis in axially laminated rotor of synchronous reluctance machines under different loads 不同负载下同步磁阻机轴向叠片转子涡流损耗的快速准确分析方法

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-22 DOI: 10.1049/elp2.12450

Maksim A. Sitnikov, Floran Martin, Anouar Belahcen

{"title":"Fast and accurate methodologies for the eddy current losses analysis in axially laminated rotor of synchronous reluctance machines under different loads","authors":"Maksim A. Sitnikov, Floran Martin, Anouar Belahcen","doi":"10.1049/elp2.12450","DOIUrl":"10.1049/elp2.12450","url":null,"abstract":"The authors present two fast and accurate methodologies for the computation of eddy current losses in the axially laminated rotor of a synchronous reluctance machine. The methodologies are based on different combinations of the finite element method in time and frequency domains with 2D and 3D formulations. First, a comparative study of the 2D and 3D formulations for loss calculation is presented, considering various load angles of the machine to illustrate the problem of eddy-current losses in this type of machines and its dependence on the load angle. The influence of the iron saturation on the loss calculation is also evaluated in these computations. A novel correction factor based on the computations at two load angles is proposed to convert the losses computed from a 2D model to match those computed from a 3D model. For the sake of generality, investigations are also conducted for various thicknesses of the lamination layers and different machine lengths, and an analytical method to describe the dependency of eddy-current losses on the load angle of the machine is introduced. Moreover, a simplified method is proposed for modelling eddy currents in the frequency domain and calculating losses in an axially laminated structure based solely on the results of a magnetostatic solution. The results obtained by the simplified model demonstrate excellent agreement with the full 3D magneto-dynamic simulation. Overall, the findings contribute to understanding and accurately characterising the eddy current losses in axially laminated rotors, offering potential insights for designing and optimising axially laminated synchronous reluctance electric machines.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141108751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and analysis of a less-magnets consequent-pole line-start permanent magnet motor with low cogging torque 设计和分析具有低齿槽转矩的少磁极后极线启动永磁电机

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-21 DOI: 10.1049/elp2.12443

Fan Wu, Xiaolin Wang, Xucong Bao, Ruixuan Li

{"title":"Design and analysis of a less-magnets consequent-pole line-start permanent magnet motor with low cogging torque","authors":"Fan Wu, Xiaolin Wang, Xucong Bao, Ruixuan Li","doi":"10.1049/elp2.12443","DOIUrl":"10.1049/elp2.12443","url":null,"abstract":"The paper suggests a design and optimisation approach for a consequent-pole line-start permanent magnet motor (CPLSPM) with flexible pole arc coefficients and high utilisation of rare-earth (RE) materials, without the need for a variable frequency drive. The presence of dual-sided slots and adjustable pole arc coefficient sets CPLSPM apart from other types of motors, making the analysis of its cogging torque more complex. Taking into account the double-sided slotted and flexible adjustable pole arc coefficient, a cogging torque and airgap flux density model was established, and the influence of the pole arc coefficient on the characteristics of the cogging torque and airgap flux density of CPLSPM was analysed. The authors conduct multidimensional optimisation considering the coupling of multiple parameters to obtain a CPLSPM with minimal RE material usage, low cogging torque and excellent start-up and steady-state performance. Finite element simulation data are presented to validate the factors affecting the cogging torque and the feasibility of the proposed less-magnetic CPLSPM design. Finally, a prototype of a 750 rpm/2.2 kW CPLSPM is built, and performance testing is carried out for comparison, and applied to submersible mixers.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12443","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study of a high-speed permanent magnet motor when powered by different methods 采用不同方法驱动高速永磁电机的比较研究

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-20 DOI: 10.1049/elp2.12449

Zhenning Qi, Yue Zhang

{"title":"Comparative study of a high-speed permanent magnet motor when powered by different methods","authors":"Zhenning Qi, Yue Zhang","doi":"10.1049/elp2.12449","DOIUrl":"10.1049/elp2.12449","url":null,"abstract":"The authors present the multi-physical field performances comparative research for a 30 kW, 30,000 r/min high-speed permanent magnet motor (HSPMM) when the motor is powered by the sinusoidal pulse width modulation (SPWM) voltage inverter and sinusoidal voltage source, respectively. Firstly, electromagnetic performances including torque, voltage and current of the HSPMM with different driving methods are compared and analysed by the finite element method (FEM). Considering the effects of high operation frequency, power losses of the HSPMM with different driving methods under full-load conditions are calculated and compared with the skin effect and the proximity effect considered for HSPMM winding copper loss estimation. Based on the above analysis, a prototype driven by the SPWM voltage inverter is manufactured, with its electromagnetic and thermal performances tested and verified. In addition, several influencing factors of the HSPMM rotor eddy current loss are studied, with their effects on the HSPMM under different driving methods further analysed and compared as well. A novel equivalent power supply method is proposed to effectively save the calculation time with a negligible error. Finally, in order to further improve the heat dissipation capacity of the HSPMM, a novel cooling method is intensively studied with its influencing factors further analysed. The cooling effect of the novel cooling method and the temperature of the motor components are verified and calculated by the computational fluid dynamics (CFD) method.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12449","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141121541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel measurement-protection-integrated current transformer based on hybrid core and magnetic field sensor 基于混合铁芯和磁场传感器的新型测量保护一体化电流互感器

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-16 DOI: 10.1049/elp2.12417

Zhexuan Zhang, Baichao Chen, Cuihua Tian, Yaojun Chen, Yu Wang

{"title":"A novel measurement-protection-integrated current transformer based on hybrid core and magnetic field sensor","authors":"Zhexuan Zhang, Baichao Chen, Cuihua Tian, Yaojun Chen, Yu Wang","doi":"10.1049/elp2.12417","DOIUrl":"10.1049/elp2.12417","url":null,"abstract":"Current transformers (CTs) are widely used for energy metering, relay protection, condition monitoring and control circuits. However, CT saturation may lead to non-negligible measurement errors and relay malfunctions, posing a threat to the stability and security of the power grid. In order to address the problem of CT saturation, a novel measurement-protection-integrated current transformer (MPICT) is proposed. First, the working states of the MPICT are summarised and the approximate expressions for the steady-state measuring characteristics, the transient response characteristics, and the measurement errors are derived from the equivalent circuit model. Then, the feasibility of the MPICT and the theoretical analyses are verified by the 3D FEM simulation imitating the presented MPICT excited by diverse currents. Finally, a down-scale prototype is fabricated and a series of tests are conducted in the laboratory to validate the effectiveness of the equipment. The simulation and experimental results suggest that the output of the MPICT can accurately reconstruct the primary current waveform, even if the primary current contains decaying or constant DC component.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140971322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on cascaded multilevel converters for dual motor drive systems based on a nine-switch converter 基于九开关转换器的双电机驱动系统级联多电平转换器研究

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-13 DOI: 10.1049/elp2.12441

Pan Wang, Hu Xu, Lei Yuan

{"title":"Research on cascaded multilevel converters for dual motor drive systems based on a nine-switch converter","authors":"Pan Wang, Hu Xu, Lei Yuan","doi":"10.1049/elp2.12441","DOIUrl":"10.1049/elp2.12441","url":null,"abstract":"In order to address the issues of complexity, high cost, large volume, and low reliability associated with traditional H-bridge cascaded converters when operating under high voltage, high capacity, and dual electric motor loads, the authors propose the utilisation of a nine-switch converter as an alternative to the conventional H-bridge converter for implementing cascaded multilevel converters in dual electric motor drive systems. After conducting an analysis and research on the topology and operational control strategy of cascaded multilevel converters based on the nine-switch converter, a design is presented using six individual nine-switch converter units to develop a cascaded multilevel converter capable of driving two 3 MW asynchronous electric motors at a 6 kV voltage level. Simulation verification is performed, and a scaled-down prototype is built for experimental validation. The results demonstrate that, in comparison to traditional H-bridge cascaded converters, the proposed cascaded multilevel converter can effectively drive dual electric motors at the same or different frequencies while reducing the number of switches to 1/4, the total transformer windings to 1/2, and Direct Current-side capacitors to 1/6. This improvement enhances system reliability, portability, and load adaptability, thus offering increased versatility in dual electric motor drive applications.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12441","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140982921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-fast finite element analysis of coreless axial flux permanent magnet synchronous machines 无铁芯轴向磁通永磁同步电机的超快速有限元分析

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-07 DOI: 10.1049/elp2.12439

Yaser Chulaee, Dan M. Ionel

{"title":"Ultra-fast finite element analysis of coreless axial flux permanent magnet synchronous machines","authors":"Yaser Chulaee, Dan M. Ionel","doi":"10.1049/elp2.12439","DOIUrl":"10.1049/elp2.12439","url":null,"abstract":"Large-scale design optimisation techniques enable the design of high-performance electric machines. Electromagnetic 3D finite element analysis (FEA) is typically employed in optimisation studies for accurate analysis of axial flux permanent magnet (AFPM) machines, which require extensive computational resources. To reduce the computational burden, a FEA-based mathematical method relying on the geometric and magnetic symmetry of coreless AFPM machines is proposed to estimate the machine performance indicators using the least number of FEA solutions, thereby significantly lowering the running time. This method is generally applicable to AFPM machines with low saturation effects and cogging torque as exemplified for a printed circuit board (PCB) stator coreless AFPM machine. To further reduce the computation time, a systematically simplified equivalent 3D FEA model for planar PCB coils integrated with this machine is also proposed. The practical implementation of the introduced method is elaborated based on an example optimisation study, and an analytical method for fast design scaling is also discussed. The results of the proposed approach are compared with detailed transient FEA results, and a prototype 26-pole PCB stator coreless AFPM machine was also used to validate the results experimentally.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12439","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141002178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Digital implementation method and research on thermal life loss of power transformers 电力变压器热寿命损失的数字化实现方法与研究

IF 1.7 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-06 DOI: 10.1049/elp2.12429

Li Dongxue, Liu Yan, Jiang Jialin, Jing Yongteng, Lv Zhonghua, Chen Guolong, Liu Ran

{"title":"Digital implementation method and research on thermal life loss of power transformers","authors":"Li Dongxue, Liu Yan, Jiang Jialin, Jing Yongteng, Lv Zhonghua, Chen Guolong, Liu Ran","doi":"10.1049/elp2.12429","DOIUrl":"10.1049/elp2.12429","url":null,"abstract":"The report of the 20th National Congress of the Communist Party of China pointed out that it is necessary to accelerate the construction of digital China, and actively develop equipment intelligence, digitalization, and high-end equipment manufacturing. With the construction of a new round of digital China, the safety of digital technology and high-end equipment is particularly important for power grid. Transformer is an important link of power grid operation. The destructive thermal failure of transformer has become a hot research issue in the power industry. At the same time, there are more and more power electronic equipment in the power grid, which makes the regulation and control more and more complicated. Taking a 1000 kVA oil-immersed transformer as an example, the magnetic, current, and thermal multi field coupling numerical analysis method is first used to simulate and analyse the operation status of the transformer. By comparing the simulation results with the monitoring data results, the error of the results is controlled within 5%. Finally, the multi-state characteristic parameters of the transformer are monitored through sensors, and the numerical simulation analysis results are integrated with the state monitoring results to build a transformer thermal life loss assessment system. The method in this paper can evaluate and analyse the running state of transformer in real time, which is of great significance for the power company to formulate the treatment measures.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12429","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141011163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An analytical fast field solver for surface permanent magnet co-axial magnetic gears 表面永磁同轴磁齿轮的分析型快速磁场求解器

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-05-01 DOI: 10.1049/elp2.12438

Mohammad Hosein Javanmardi, Akbar Rahideh

引用次数: 0