Iet Electric Power Applications最新文献_第2页

Investigation of Impedance-Based Protection Mechanisms for Dry-Type Iron Core Reactors Under Core Saturation Conditions 干式铁芯电抗器饱和条件下基于阻抗的保护机制研究

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-13 DOI: 10.1049/elp2.70099

Jiankang Liu, Qicheng Zhao, Sifang Wang, Yunbing Wei

{"title":"Investigation of Impedance-Based Protection Mechanisms for Dry-Type Iron Core Reactors Under Core Saturation Conditions","authors":"Jiankang Liu, Qicheng Zhao, Sifang Wang, Yunbing Wei","doi":"10.1049/elp2.70099","DOIUrl":"10.1049/elp2.70099","url":null,"abstract":"This paper discusses the potential core saturation issue in dry-type iron core reactors caused by power system harmonics and proposes a protection strategy based on variations in third harmonic impedance characteristics. First, an equivalent model of the dry-type iron core reactor is established by integrating its electromagnetic characteristics. Electromagnetic simulations using the COMSOL software are then conducted to analyse the dynamic trend of the reactor's equivalent inductance during core saturation. Subsequently, a power system model containing a high-voltage capacitor device was built based on Simulink. Simulations show that when the 3rd harmonic content reaches 6%, the reactor core enters a saturated state; whereas the 5th and 7th harmonics need to reach 11% and 24% content, respectively, to trigger saturation. Further analysis reveals that, compared with the fundamental wave and the 5th/7th harmonics, the 3rd harmonic impedance ratio curve exhibits unique identifiability in both single- and multifrequency harmonic scenarios: in weak and strong grid conditions, the corresponding inductance loss rate α can be accurately identified within specific ranges; in complex multifrequency harmonic environments, this identification range narrows further, with significantly improved precision. This characteristic provides a reliable basis for real-time monitoring of the saturation state of dry-type iron core reactors, confirms the effectiveness and stability of the protection method based on the 3rd harmonic impedance characteristics in complex grid environments and offers key theoretical support for the design of related protection logic.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70099","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050915","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 Single-Phase Grounding Fault Line Selection Method for Flexible Grounding Active Distribution Networks Based on the Ratio of Zero-Sequence Current Changes 基于零序电流变化比的柔性接地主动配电网单相接地故障选线方法

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-12 DOI: 10.1049/elp2.70093

Shi Su, Yuan Li, Xuehao He, Qingyang Xie, Jiali Su, Fahui Chen, Botong Li, Changqi Wang

{"title":"A Single-Phase Grounding Fault Line Selection Method for Flexible Grounding Active Distribution Networks Based on the Ratio of Zero-Sequence Current Changes","authors":"Shi Su, Yuan Li, Xuehao He, Qingyang Xie, Jiali Su, Fahui Chen, Botong Li, Changqi Wang","doi":"10.1049/elp2.70093","DOIUrl":"10.1049/elp2.70093","url":null,"abstract":"Single-phase grounding faults (SPGFs), especially high-resistance faults, significantly weaken the electrical characteristics of active distribution networks (ADNs), thereby posing considerable challenges for faulted line selection (FLS). To address these challenges under flexible grounding conditions, this paper proposes an FLS method based on the ratio of zero-sequence current variations. By establishing the zero-sequence equivalent circuit of SPGFs in flexible grounding ADNs, the variation patterns of zero-sequence currents in both faulted and nonfaulted feeders are analysed before and after the parallel insertion of a small grounding resistor. Using a designated reference feeder, the proposed method evaluates the magnitude and phase characteristics of zero-sequence current variation ratios of other feeders relative to the reference. These features are then used to construct a reliable line selection criterion. The effectiveness of the method is validated through fault simulations carried out in PSCAD/EMTDC. Simulation results confirm that the proposed approach achieves high selection accuracy and demonstrates strong robustness against transition resistance.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037588","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

Optimal Compensation of Voltage Drop Across Long Power Cable in Motor Drive Systems: A Vector Controlled Approach 电机驱动系统中长电缆电压降的最优补偿：一种矢量控制方法

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-11 DOI: 10.1049/elp2.70098

Mesaad Albader, Shrikesh Sheshaprasad, Hamid A. Toliyat

{"title":"Optimal Compensation of Voltage Drop Across Long Power Cable in Motor Drive Systems: A Vector Controlled Approach","authors":"Mesaad Albader, Shrikesh Sheshaprasad, Hamid A. Toliyat","doi":"10.1049/elp2.70098","DOIUrl":"10.1049/elp2.70098","url":null,"abstract":"This paper proposes an optimal voltage compensation method for the drop across long power cable in a motor drive system. In the proposed method the drive is utilised to compensate the voltage drop and no additional voltage regulation device is required. The method is optimised by means of vector control-based approach introduced in this paper. The independent control of voltage vectors in the d-axis and q-axis allow compensation of the amplitude drop and the phase shift. The analysis in this paper proves the minimum voltage compensation can be achieved by the independent control of the d-axis and the q-axis voltages. A dqn model of the long power cable is used in this paper which decouple the mutual coupling between the three phases. The paper starts with analysing the dependency of the voltage drop on the cable parameters and the operating power factor. Then, a brief background of the dqn power cable model is introduced. Detailed analysis of the proposed method is presented. The MATLAB simulation results show the operation from standstill slip to synchronous speed slip to verify the validity of the method in that slip range. The experimental verification is carried out by using a lumped long cable model with two different sets of inductance and resistance. It is seen that the proposed algorithm can reduce the voltage requirement by 15%–18% compared to the commonly used scalar compensation method.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037569","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

Accurate Calculation of Electromagnetic Torque and Harmonic Characteristics of Hydro Generator Based on Positive and Negative Sequence Decoupling 基于正负序解耦的水轮发电机电磁转矩及谐波特性精确计算

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-08 DOI: 10.1049/elp2.70097

Peng Hou, Guoguang Zhang, Baojun Ge

{"title":"Accurate Calculation of Electromagnetic Torque and Harmonic Characteristics of Hydro Generator Based on Positive and Negative Sequence Decoupling","authors":"Peng Hou, Guoguang Zhang, Baojun Ge","doi":"10.1049/elp2.70097","DOIUrl":"10.1049/elp2.70097","url":null,"abstract":"Aiming at the technical problems of electromagnetic parameter analysis of large hydro generators, this paper innovatively proposes an electromagnetic torque analysis method based on the characteristics of fundamental electric quantity, with the core idea of positive and negative sequence decoupling. Under the condition of ungrounded neutral point, the method eliminates the interference of zero-sequence magnetic field and realises the decoupling of positive-sequence and negative-sequence components in the system. It models the generator as an independent positive-sequence network and negative-sequence network, decomposes the three-phase voltage and current into positive-sequence and negative-sequence components through symmetrical component transformation and establishes separate mathematical models for each sequence component to achieve independent analysis of their electromagnetic characteristics. By accurately modelling the actual connection relationship of each phase branch of the stator winding, the accurate mathematical model of the three-phase fundamental voltage, current and electromagnetic power of the stator side under the stable operation of the generator is constructed. The test results of the finite element simulation experiment platform based on 280 MVA large hydro generator show that the proposed method can effectively identify the fundamental electromagnetic torque and second harmonic electromagnetic torque under stable operating conditions, and the measured relative error range is 0.01%–9.41%, which has high engineering application accuracy.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70097","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145012129","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 Improved Rotor Flux Observer-Based Sensorless Control Method for Dual Three-Phase Axial Flux PMSM 基于转子磁链观测器的改进双三相轴向磁链永磁同步电机无传感器控制方法

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-05 DOI: 10.1049/elp2.70079

Anchen Yang, Mingyao Lin, Yixiang Tu, Lun Jia, Keman Lin, Peng Wang

{"title":"An Improved Rotor Flux Observer-Based Sensorless Control Method for Dual Three-Phase Axial Flux PMSM","authors":"Anchen Yang, Mingyao Lin, Yixiang Tu, Lun Jia, Keman Lin, Peng Wang","doi":"10.1049/elp2.70079","DOIUrl":"10.1049/elp2.70079","url":null,"abstract":"Due to the remarkable performance, dual three-phase axial flux 33permanent magnet synchronous motors (DTP-AFPMSMs) are increasingly being adopted in the field of electric vehicles (EVs). However, the installation of position sensors limits the application scenarios of DTP-AFPMSMs owing to increased complexity, size and cost. This article proposes an innovative high-speed sensorless control method for surface-mounted DTP-AFPMSMs using an improved rotor flux observer. The proposed observer achieves precise rotor flux estimation by filtering out harmonic distortion and noise from the rotor flux of the first winding set using high-pass and low-pass filters, followed by a tracking-mode PI controller that accurately tracks the phase and amplitude of the rotor flux in the second winding set. Therefore, the proposed method can enable accurate rotor position estimation without the need for a phase-locked loop (PLL) and realise a more precise sensorless motor control. A series of simulations and experiments are carried out to validate the effectiveness of the observer, which reveals that the proposed method can effectively estimate the electrical position angle with a tiny error and presents a considerable improvement over the conventional method.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144999021","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

Axial Force Negative Stiffness in Axial-Flux Electric Machines 轴向磁通电机的轴向力负刚度

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-03 DOI: 10.1049/elp2.70095

Wen Liang Soong, Emad Roshandel, Zhi Cao, Amin Mahmoudi, Solmaz Kahourzade

引用次数: 0

Nonadjacent Demagnetisation Detection in Direct-Drive Permanent Magnet Generators for Renewable Energy Systems 可再生能源系统直接驱动永磁发电机非相邻消磁检测

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-01 DOI: 10.1049/elp2.70085

Alexandros Sergakis, Giorgos A. Skarmoutsos, Markus Mueller, Konstantinos N. Gyftakis

引用次数: 0

Modelling of Stress and Deformation of Interior Permanent Magnet Integrated Motor for Ball Mill Considering Rotor Eccentricity 考虑转子偏心的球磨机内置永磁集成电机应力与变形建模

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-09-01 DOI: 10.1049/elp2.70086

Jun Gao, Xueyan Han, Zhongliang An, Zhanyang Yu, Huadong Xing

{"title":"Modelling of Stress and Deformation of Interior Permanent Magnet Integrated Motor for Ball Mill Considering Rotor Eccentricity","authors":"Jun Gao, Xueyan Han, Zhongliang An, Zhanyang Yu, Huadong Xing","doi":"10.1049/elp2.70086","DOIUrl":"10.1049/elp2.70086","url":null,"abstract":"The interior permanent magnet integrated motor (IPMIM) for ball mill has complex eccentricity problems. In order to solve the difficult problem of calculating the strength and stiffness of IPMIM in eccentric state, a mathematical model under eccentricity was established. Analytical solutions for the rotor stress and deformation were respectively derived for parallel eccentricity, inclined eccentricity, and composite eccentricity. By using the analytical solutions and finite element method, the stress and deformation of the rotor for IPMIM with a power of 210 kW were analysed. The results show that the calculation results obtained by two methods are highly consistent, which proves that the analytical solutions can accurately predict the stress and deformation of the rotor of IPMIM for ball mill. In addition, based on the analytical modelling, the influence of magnetic tensile stress and structural parameters on the rotor stress and deformation were explored, aiming to summarise the variation laws of the stress and deformation of the rotor.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923508","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

Single-Switch Open-Circuit Fault Diagnosis Based on Error Current for Active Power Filter 基于误差电流的有源电力滤波器单开关开路故障诊断

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-08-31 DOI: 10.1049/elp2.70094

Pengcheng Han, Xing Du, Chao Wu, Ying Lou, Fei Li, Li Zeng, Yanbo Wang

{"title":"Single-Switch Open-Circuit Fault Diagnosis Based on Error Current for Active Power Filter","authors":"Pengcheng Han, Xing Du, Chao Wu, Ying Lou, Fei Li, Li Zeng, Yanbo Wang","doi":"10.1049/elp2.70094","DOIUrl":"10.1049/elp2.70094","url":null,"abstract":"This paper presents a fault diagnosis method based on the error current for active power filter (APF) to enhance reliability. APF have significant practical significance and application value because they can be used to solve power quality problems such as harmonics, reactive power or negative sequence existing in the power system. First, the expression of error current is educed which is analysed by the influence of different open-circuit faults on the shunt three-phase three-level APF. Based on this, we analyse the differences in error current of the harmonic compensator when it is in normal operation and under different fault conditions, and then construct fault diagnosis variables. In addition, the relationship between the value of the fault diagnosis variable and fault type is built and the fault diagnosis method is proposed to detect the open-circuit fault and locate the faulty switches. Finally, the simulation model and the experimental platform are established to verify the fault diagnosis method. The results of simulation and experiment are given to validate the proposed fault diagnosis.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923796","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 Feature Selection Approach Based on Genetic Algorithm Combined With Expanded Search Scope Applied to Bearing Fault Diagnosis Model 结合扩展搜索范围的遗传算法特征选择方法在轴承故障诊断模型中的应用

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2025-08-27 DOI: 10.1049/elp2.70077

Chun-Yao Lee, Truong-An Le, Yu-Chu Chiang, Chung-Hao Huang

{"title":"A Feature Selection Approach Based on Genetic Algorithm Combined With Expanded Search Scope Applied to Bearing Fault Diagnosis Model","authors":"Chun-Yao Lee, Truong-An Le, Yu-Chu Chiang, Chung-Hao Huang","doi":"10.1049/elp2.70077","DOIUrl":"10.1049/elp2.70077","url":null,"abstract":"Bearing is very important for motors. When a bearing fails, if the problem can be discovered and solved as early as possible, it can not only reduce the cost of repairs, but also greatly improve safety. This study proposes a machine learning-based model for diagnosing bearing faults. Regarding this model, first, the Hilbert–Huang transform (HHT) and multi-resolution analysis (MRA) in feature extraction methods are used to derive relevant features from the original signal. Then, a feature selection method based on genetic algorithm (GA) and combined with the concept of expanded search scope is used to delete redundant features. Finally, the k-nearest neighbour algorithm (KNN) and feed-forward neural network (FFNN) in the classifier are used. In addition, the University of California Irvine (UCI) datasets, Case Western Reserve University (CWRU) bearing dataset, Mechanical Failure Prevention Technology (MFPT) bearing dataset, and motor fault current signal dataset were used to validate the fault diagnosis ability of the proposed model.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":"19 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.70077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144910149","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