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Revealing the Impact of Ferromagnetic Elements on Fe-Based Amorphous Alloy Properties via ab initio Molecular Dynamics Simulations and Experiments

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Chinese Physics Letters 2025年第1期42卷 102-113页

作者： Jin-Hua Xiao Da-Wei Ding Lin Li Yi-Tao Sun Mao-Zhi Li Wei-Hua Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China

A high saturation magnetic flux density(Bs)is essential for the development of Fe-based amorphous alloys for electromagnetic devices and ***,achieving a high Bs often compromises the glass-forming ability(GFA)of Fe-based amorphous *** study investigates the effects of ferromagnetic elements(Fe,Co,and Ni)on the microstructure and magnetic properties of Fe86B7C7 amorphous alloys through experiments and ab initio molecular dynamics *** analyzing both the experimental and simulation results,the relationship between the atomic structures,GFA,and magnetic properties of these amorphous alloys was *** results indicate that the GFA of the alloys is correlated with the proportion of icosahedral and body-centered cubic *** addition of Co and Ni not only improved the GFA of the alloys but also effectively increased the overall magnetic moment with an appropriate amount of Co and a small amount of *** increase in the magnetic moment primarily arises from the enhancement of the magnetic moment of Fe atoms,resulting from the redistribution between the spin-up and spin-down electrons of Fe-3d orbits,as well as the strong exchange interactions between Fe and Co and Fe–Ni *** results obtained offer valuable insights into the correlation between the atomic structure and magnetic properties of these amorphous alloys and suggest potential directions for the optimization of Fe-based amorphous alloys.

关键词： alloys microstructure magnetic

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Preparation and Comprehensive Properties Study of Polyimide Films Modified with SiC and CNT

Preparation and Comprehensive Properties Study of Polyimide ...

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International Conference of electrical, Electronic and Networked energy systems, EENES 2024

作者： Peng, Tianying Wang, Juqi Wang, Jian Zhang, Shumin Liu, Jikui State Key Lab of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing102206 China Beijing Institute of Control Engineering Beijing100089 China

ISBN: (纸本)9789819618675

In both power systems and aerospace electrical fields, with the increasing application voltage levels of equipment, the use of traditional polyimide (PI) films as insulation materials is prone to corona discharge and even insulation failure, it is difficult to ensure the safe operation of equipment. In order to improve the thermal conductivity and corona resistance of polyimide films, this experiment adopts a synergistic modification of polyimide with carbon nanotubes (CNT) with good conductivity and high mechanical strength, and 10% doped silicon carbide. We investigate and evaluate the properties of modified composite films with different components, and explore the optimal formula for synergistically improving the comprehensive performance of composite films. The experimental results show that (10% SiC + 0.7% CNT)/PI composite films have the best comprehensive properties, and the 5% mass loss temperature is 30 ℃ higher than that of pure PI film, the thermal conductivity and tensile strength of PI film were increased by 95.7% and 22.53%, respectively, and the first long-flow discharge and flashover time were 332 min and 372 min, respectively, which were 672.09% and 500% higher than those of PI film, respectively, the threshold field strength of the nonlinear conductivity is 4.30 MV/m, which is favorable for promoting space charge transport in high field strength. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Tensile strength

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Study on the Development of Discharge Pattern of Defect in Resin-Impregnated Paper Bushing Materials

Study on the Development of Discharge Pattern of Defect in R...

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2025 International Conference on electrical Automation and Artificial Intelligence, ICEAAI 2025

作者： Wei, Jufang He, Chun Qi, Bo Ma, Xiaoguang Ma, Chuang Liu, Dong Feng, Junji Duan, Minghui Yang, Xiao State Grid Tianjin Electric Research Institute Tianjin China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China

ISBN: (纸本)9798331506797

Resin-impregnated paper(RIP) capacitive bushing is one of the important electrical equipment in the field of high-voltage power transmission. However, there is a lack of research on the change rule of insulation parameters under long-term operating conditions of the RIP bushing containing internal defect and the diagnosis of insulation defect of the RIP bushing. For the laboratory casting of RIP specimens containing metal foreign object defect, non-metal foreign object defect and bubble defect three types of specimens were studied in the partial discharge starting voltage and constant voltage long time defect in the process of the development of the characteristics of the discharge spectrum, comparing the discharge before and after the development of the tanδ-f curve of the law of change, in which the starting voltage of local discharge for metal foreign object defect is 10.2 kV, the starting voltage of local discharge for non-metal foreign object defect is 14.1 kV, and the starting voltage of local discharge for bubble defect is 13.7 kV. The discharge of metal foreign object defect undergoes two phases of increasing discharge frequency and increasing discharge amount, the discharge amount of non-metal foreign object defect is always maintained at 300-400 pC during the development of discharge, and the discharge phase gradually becomes wider with the increase of the withstand time, and finally becomes all-phase discharge, and the discharge amount of the bubble defect specimens increases gradually with the increase of the withstand time during the development of discharge, and the discharge peaks appear at 112.5°-157.5° and 292.5°-337.5° subsequently. °-157.5° and 292.5°-337.5° discharge peaks. According to the above specimen discharge development research results, for the RIP bushing long time defect discharge development research to provide the experimental basis. © 2025 IEEE.

关键词： defect simulation development stage insulation characteristics partial discharge resin-impregnated paper

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Sensing Method and of Gas Insulation Line Abnormal Vibration Based on Optical Fiber Interferometer 19th

Sensing Method and of Gas Insulation Line Abnormal Vibration...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Dong, Manling Zhan, Zhenyu Xin, Weifeng Ma, Guoming Wang, Sihan State Grid Henan Electric Power Research Institute Henan Zhengzhou China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

ISBN: (纸本)9789819613908

Gas insulated lines (GIL) are renowned for their compact design, high insulation strength, and environmental sustainability, making them a highly reliable and cost-effective choice for power systems. Ensuring the safe operation of gas-insulated lines is crucial for maintaining the reliability of the power grid. This paper proposes a method for abnormal vibration sensing of gas-insulated lines based on an optical fiber interferometer. Utilizing the high-frequency carrier method, the interference of field noise in acoustic vibration signal detection is reduced, and phase information is demodulated using the differential cross-correlation algorithm. In the field application, the abnormal sound and vibration signal is detected, which is finally confirmed to be the metal collision and impact sound caused by the stress release of the head bolt caused by thermal expansion and shrinkage, which verifies the effectiveness of the proposed method. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Optical fibers

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Analysis of Small Signal Stability of a D-PMSG system Connected with Grid Following Battery energy Storage 2nd

Analysis of Small Signal Stability of a D-PMSG System Connec...

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2nd International Conference on Smart electrical Grid and renewable energy, SEGRE 2024

作者： Feng, Yuchen Lin, Chang Zhang, Zhe Lin, Weifang Yi, Jun Xue, Ancheng State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing102206 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9789819624553

Grid following battery energy storage system (GFL-BESS) can cope with the fluctuation and uncertainty of the output of direct-drive permanent magnet synchronous generator (D-PMSG). However, during the suppression of D-PMSG output fluctuations, the impact of GFL-BESS on the small signal stability of its control link is unknown. Based on the eigenvalue analysis method, this paper analyzes the influence of GFL-BESS on the dominant eigenvalues of D-PMSG during power response. In details, firstly, the state space model of D-PMSG is presented. Secondly, the mathematical model of the GFL-BESS with its control strategy is established. Finally, the influence of GFL-BESS on the small signal stability of D-PMSG is analyzed with the eigenvalue analysis method. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Battery storage

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A Scheduling Strategy for power system with Multiple energy Storage Considering Voltage Stability 2nd

A Scheduling Strategy for Power System with Multiple Energy ...

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2nd International Conference on Smart electrical Grid and renewable energy, SEGRE 2024

作者： Zhao, Yihan Zheng, Zhehao Zhang, Zhe Xue, Ancheng Lin, Weifang Yi, Jun State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing102206 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9789819619641

Currently, the scheduling model using DC power flow, thus it result in indirect considering of the voltage stability with checking. At the same time, there is lack of scheduling strategy for power system with multiple energy storage. A multiple time-scales scheduling strategy for power system with multiple energy storage which can directly considering voltage stability is proposed in this paper. Specifically, firstly, a linear AC power flow model that can directly reflect the voltage magnitude is presented;secondly, in order to consume new energy (NE), a multiple time-scales scheduling model combined with the linearized voltage stability constraint is constructed. Finally, the simulation results with the improved IEEE30 bus by GUROBI, show that the methods could meet the voltage stability requirements and effectively reduce the renewable energy abandonment rate. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： multiple energy storage multiple time-scales renewable energy accommodation voltage stability

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A Real-Time power Allocation Method for Electric Vehicles with Frequency Regulation Considering Battery Loss 19th

A Real-Time Power Allocation Method for Electric Vehicles wi...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Pan, Yi Chen, Quanxi Hu, Junjie State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source North China Electric Power University Beijing102206 China

ISBN: (纸本)9789819613823

To achieve the cooperative participation of electric vehicle (EV) in power network frequency control, it is necessary to allocate the frequency regulation power in the real-time phase. In view of these practical problems, this paper proposes a real-time power allocation method for EVs participating in frequency regulation service considering battery loss. Firstly, the EV parking time conversion method is proposed, and the feasible domain of EV is characterized by considering the discharge depth. Secondly, the power allocation model of EV fleet based on state conversion is proposed to reduce battery loss. Finally, the simulation results show that the proposed method can effectively reduce EV charge-discharge conversion times and ensure EV power demand. Compared with the traditional method, the response error of frequency regulation signal is reduced by about 90%. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Battery loss Electric vehicle Frequency regulation power allocation

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Research on Temperature Variation Characteristics of Dielectric Loss Factor of Different Transformer Oil and Oil-Impregnated Pressboard 11th

Research on Temperature Variation Characteristics of Dielect...

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11th Frontier Academic Forum of electrical Engineering, FAFEE 2024

作者： Shangguan, Wenyuan Xue, Xiaoqiang Ge, Hao Cheng, Hao Zhou, Minghui Tian, Huidong Gao, Chunjia Qi, Bo State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China State Grid Economic and Technological Research Institute Co. Ltd Beijing China

ISBN: (纸本)9789819788316

Dielectric loss factor serves as a pivotal indicator for assessing the insulation effectiveness of converter transformers. Given the intricate operational environment of converter transformers, especially amidst DC power transmission, the internal oil-paper insulation structure remains susceptible to the ambient temperature, thereby instigating variations in the dielectric properties of the oil-paper insulation. Such fluctuations can potentially trigger operational malfunctions within the converter transformer. Hence, a comprehensive examination of influence on the converter transformer by temperature becomes imperative. In this context, exploring the impact of transformer oil and oil-impregnated pressboard on dielectric properties emerges as a matter of profound significance. This study thus focuses on employing the dielectric loss factor as the principal parameter for characterizing the dielectric properties of oil-paper insulation. By delving into the variations in dielectric loss factors across different temperatures, this paper investigates three distinct types of transformer oil and oil-impregnated pressboard, thereby shedding light on their respective dielectric behavior under varying thermal conditions. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Dielectric losses

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Stabilization domain study of islanded photovoltaic via MMC-HVDC transmission system 4

Stabilization domain study of islanded photovoltaic via MMC-...

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4th International Conference on energy Utilization and Automation, ICEUA 2025

作者： Zhang, Lidong Zhang, Shuwen Guo, Chunyi China Southern Power Grid CSG Electric Power Research Institute Guangdong Guangzhou China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

The large-scale integration of renewable energy can promote cleaner and lower-carbon energy utilization;however, it adversely affects the safe and stable operation of the power system. To address this issue, this paper first establishes a mathematical model and state-space model for islanded photovoltaics via the MMC-HVDC transmission system. Subsequently, it integrates considerations of steady-state electrical parameters and small-signal stability to propose a method for calculating the system's stability domain. Based on this, the study investigates the stability domain of islanded photovoltaic via MMC-HVDC transmission system and analyzes the impact of photovoltaic transmission line length and control parameters on system stability. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： state space methods

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Distributed Balanced Grouping power Control for Battery energy Storage systems to Mitigate Adjustable Capacity Discrepancy

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IEEE Transactions on energy Conversion 2025年

作者： Yu, Yang Wang, Boxiao Li, Menglu Lv, Tingyan Chen, Xiao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Baoding071003 China

Conventional grouping control strategies for battery energy storage systems (BESS) often face issues concerning adjustable capacity discrepancy (ACD), along with reduced operational speed and accuracy, especially in delay environments. To address these challenges, this paper proposes a distributed grouping power control strategy based on bipartite grouping for BESS. First, the causes of ACD in battery groups (BGs) within BESS are analyzed. An ACD evaluation model is developed to examine the limited competition among BGs, and a new BESS grouping allocation mechanism is introduced. Next, a bipartite consensus algorithm (BCA) is adapted for power control using a normalized transformation matrix. Enhancements to the Laplacian matrix are proposed to compress delays and improve iteration speed and accuracy, resulting in an improved BCA (IBCA). Finally, the lBCA is implemented to achieve balanced power control according to the proposed grouping allocation mechanism. Both simulations and experimental results demonstrate that the lBCA provides faster iteration speed, higher accuracy, and effectively mitigates ACD, resulting in better state-of-charge balance and precise control. © 2025 IEEE.

关键词： Battery storage

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