检索结果-内蒙古大学图书馆

Ferrite Core Magnetothermal Equilibrium Design for Wireless power Transfer systems Using a Novel Differential Regulation Coil

引用

IEEE Transactions on power Electronics 2025年

作者： Wei, Yize Zhang, Xian Chen, Zhixin Xu, Fei Tse, Chi K. Hebei University of Technology State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin300401 China Hebei University of Technology Hebei Key Laboratory of Equipment and Technology Demonstration of Flexible DC Transmission Tianjin300401 China City University of Hong Kong Department of Electrical Engineering 999077 Hong Kong

The safe operation and durability of a wireless power transfer (WPT) system are challenged as the power level increases due to the uneven magnetothermal distribution in the ferrite core. However, existing research has rarely taken this issue into consideration. In this paper, a novel differential regulation (DR) coil is designed and installed in the magnetic coupled structure (MCS) to achieve a uniform magnetothermal distribution of the ferrite core. To provide a theoretical foundation for the DR coil design and to evaluate the effectiveness of the proposed magnetothermal equilibrium design, a comprehensive magnetothermal equilibrium formula (MEF) is given. An 11.1 kW/85 kHz experimental prototype is built to validate the magnetothermal equilibrium method. Results show that utilizing the proposed DR coil, the maximum temperature of ferrite core and the leakage flux can be reduced by 20.0% and 18.2%, respectively. Moreover, the spatial distribution uniformity of the temperature on the ferrite core can be improved by 56.3%, and the uniformity of the spatial distribution of the magnetic flux density can be improved by 10.7%. Overall, the magnetothermal equilibrium of ferrite cores has increased by 28.1%. © 1986-2012 IEEE.

关键词： Magnetic leakage

来源：评论

学校读者我要写书评

暂无评论

Categorical Spatial Interpolation of Solar Irradiance for Regional Distributed Photovoltaic power Forecasting

引用

IEEE Transactions on Sustainable Energy 2025年

作者： Ruan, Chenglong Li, Kangping Li, Zhenghui Huang, Chunyi Wang, Fei Shanghai Jiao Tong University College of Smart Energy Shanghai200240 China Shanghai Jiao Tong University Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai200240 China Ministry of Education Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai200240 China North China Electric Power University Department of Electrical Engineering Baoding071003 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Hebei Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding071003 China

High-spatial-resolution (HSR) solar irradiance forecast data is important for regional distributed photovoltaic (PV) power forecasting. Distributed PV sites are widely geographically distributed and the cost of obtaining HSR irradiance forecast data with full regional coverage is very high. Improving spatial resolution through interpolation based on limited sparse irradiance forecast reference points is a low-cost and feasible approach. However, existing irradiance spatial interpolation methods would produce large errors under variable weather conditions (e.g., cloudy) with limited reference points, because local abrupt changes in irradiance usually occur under such weather conditions due to cloud movement. This paper proposes a categorical spatial interpolation method to improve the accuracy of distributed PV power forecasting with limited sparse irradiance forecast data. The method first converts satellite-derived shortwave radiation images into binary irradiance maps through adaptive thresholding, then trains a 3D U-net model to predict future irradiance category probabilities for each grid. These probability maps dynamically govern two parallel interpolation processes: one using reference stations in predicted clear-sky regions, another utilizing stations in cloudy zones, with final irradiance values determined by probability-weighted fusion. Case studies on a real dataset verify the effectiveness and superiority of the proposed method. © 2025 IEEE.

关键词： Solar irradiance

来源：评论

学校读者我要写书评

暂无评论

power-absorption mechanism and coupling effects in dual-wavelength laser-sustained plasma

引用

Physical Review Applied 2025年第5期23卷 054083-054083页

作者： Dongheyu Zhang (张东荷雨) Jinbao Liu (刘金宝) Yangyang Fu (付洋洋) Department of Electrical Engineering Tsinghua University 100084 Beijing China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University 100084 Beijing China

Dual-wavelength laser-sustained plasma (LSP), which absorbs energy from lasers with two different wavelengths, is promising as a high-performance light source for wafer optical inspection; however, the mechanisms of power absorption from two lasers are still not well understood. Here a fully coupled laser-thermal-hydrodynamic fluid model is established to investigate the formation characteristics of dual-wavelength LSP. The model is validated by our comparing the laser power absorption results from the simulation and those from experiments. The simulation results show that the near-infrared (915-nm) laser heats a relatively large area of the LSP. In contrast, the visible (435-nm) laser can penetrate the LSP bulk and deposit energy mainly at the focal point, resulting in a smaller, hotter, and higher-radiance LSP core. The time-dependent evolution of the dual-wavelength LSP and the energy components of laser power absorption are presented; moreover, the coupling effects of the two lasers are observed. The near-infrared laser can sustain a large-area background plasma at a relatively low temperature (approximately 15 000 K), which increases the visible laser power absorption at the LSP core, reaching the highest temperature of approximately 30 000 K. The results from this work indicate that dual-wavelength LSP can be a competitive candidate for developing high-performance broadband and high-intensity radiative light sources.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Risk-Averse Just-In-Time Scheme for Learning-Based operation of Microgrids With Coupled Electricity-Hydrogen-Ammonia Under Uncertainties

引用

IEEE Transactions on Sustainable Energy 2025年

作者： Li, Longyan Ning, Chao Pan, Guangsheng Zhang, Leiqi Gu, Wei Zhao, Liang Du, Wenli Shahidehpour, Mohammad Shanghai Jiao Tong University Department of Automation Shanghai200240 China Ministry of Education of China Key Laboratory of System Control and Information Processing Shanghai200240 China School of Electrical Engineering Southeast University Nanjing210096 China Zhejiang Key Laboratory of Distributed Generations and Microgrid Technology State Grid Zhejiang Electric Power Research Institute Hangzhou310014 China Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology China Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL60616 United States

This paper proposes a Risk-Averse Just-In-Time (RAJIT) operation scheme for Ammonia-Hydrogen-based Micro-Grids (AHMGs) to boost electricity-hydrogen-ammonia coupling under uncertainties. First, an off-grid AHMG model is developed, featuring a novel multi-mode ammonia synthesis process and a hydrogen-ammonia dual gas turbine with tunable feed-in ratios. Subsequently, a state-behavior mapping strategy linking hydrogen storage levels with the operation modes of ammonia synthesis is established to prevent cost-ineffective shutdowns. The proposed model substantially improves operational flexibility but results in a challenging nonlinear fractional program. Based upon this model, a data-driven RAJIT scheme is developed for the real-time rolling optimization of AHMGs. Unlike conventional one-size-fits-all schemes using one optimization method throughout, the data-driven RAJIT intelligently switches between cost-effective deterministic optimization and risk-averse online-learning distributionally robust optimization depending on actual risk profiles, thus capitalizing on the respective strengths of these two optimization methods. To facilitate the solution of the resulting nonlinear program, we develop an equivalent-reformulation-based solution methodology by leveraging a constraint-tightening technique. Numerical simulations demonstrate that the proposed scheme guarantees safety and yields an overall cost reduction up to 14.6% compared with several state-of-the-art methods. © 2025 IEEE.

关键词： Ammonia

来源：评论

学校读者我要写书评

暂无评论

A constant quasi-zero stiffness isolator with tension springs to isolate vibrations with ultralow frequency

引用

International Journal of Non-Linear Mechanics 2025年 175卷

作者： Zhao, Feng Ji, J.C. Cao, Shuqian Zheng, Jingyang Luo, Quantian Department of Mechanics Tianjin University Tianjin300354 China Tianjin Key Laboratory of Nonlinear Dynamics and Control National Key Laboratory of Vehicle Power System Tianjin300354 China College of Mechanical and Electrical Engineering Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment Zhengzhou University of Light Industry Zhengzhou450002 China School of Mechanical and Mechatronic Engineering University of Technology Sydney NSW2007 Australia College of Vehicle and Traffic Engineering Henan University of Science and Technology Luoyang471003 China

Many types of quasi-zero stiffness (QZS) isolators have been developed to isolate vibrations with low frequencies. However, isolating vibrations with ultralow frequency as low as 1 Hz is still a great challenge even in laboratory tests due to the high damping of QZS prototypes. To address this issue, a novel isolator with intrinsically light damping is proposed by configurating tension springs and oblique bars. The linear or nonlinear negative stiffness generated by the horizontal tension springs and oblique bars counteracts the linear positive stiffness of the vertical tension springs to obtain the QZS-related features including nonlinear QZS, constant positive or negative dynamic stiffness, constant QZS, and constant zero stiffness. Two QZS conditions are derived and the influence of parameters on QZS is thoroughly studied. The proposed isolator with tension springs has obvious differences from the previous isolator with compression springs in terms of QZS conditions, as well as force and stiffness expressions. Then, the displacement transmissibility is calculated by using the increment harmonic balance method and the continuous arc-length algorithm, which is verified by the classical harmonic balance method. These methods have the same prediction result. Finally, a prototype is fabricated and tested. The smoother force curves with constant QZS and the higher transmissibility amplitude can be obtained in tests compared to the previous isolator with compression springs under the same configuration parameters, which verifies the theoretical formulations of the proposed isolator with light damping. The prototype is further improved by replacing linear bearings with sliders to reduce the frictional effects. As a result, vibrations with ultralow frequencies lower than 1 Hz are successfully isolated. The proposed isolator has a wider frequency band and lower transmissibility than the previous isolator with compression springs. This study offers an effective method of de

关键词： Damping

来源：评论

学校读者我要写书评

暂无评论

Advanced operation and control Schemes of Retired Batteries in DC Microgrid for Secondary Usage

引用

IEEE Transactions on Smart Grid 2025年

作者： Wang, Ning Jiang, Yongbin Wang, Yanbo Mou, Di Liu, Yonghui Hu, Weihao Chen, Zhe Aalborg University Department of Energy Technology Aalborg9220 Denmark Nanyang Technological University School of Electrical and Electronic Engineering Singapore639798 Singapore Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology School of Electrical Engineering Chongqing400044 China Xi'an Jiaotong University School of Electrical Engineering Xi'an710049 China University of Electronic Science and Technology of China School of Mechanical and Electrical Engineering Chengdu610056 China

The utilization of repurposed second-life batteries from electric vehicles in DC microgrids presents a sustainable and cost-effective solution. However, efficiently integrating these batteries within DC microgrids poses two main challenges: (1) poor consistency among retired battery packs;(2) fluctuations in the DC bus voltage. Traditional approaches primarily focus on achieving the state of charge (SOC) balancing within retired battery packs, often neglecting the suppression of voltage fluctuations, thereby compromising system stability. To address these challenges, this paper proposes a virtual DC machine (VDCM)-based control strategy that enhances both the power quality of the DC microgrid and the consistency of retired battery packs. On the one hand, reconfigurable topology and SOC balancing strategies are developed to manage the equalization current, achieving SOC balancing within the retired battery packs. On the other hand, a VDCM strategy is designed to leverage the capacity characteristics of retired batteries to increase the inertia of the DC microgrid. Compared to conventional methods, experimental results show that the proposed strategy not only maintains SOC balancing during both the charging and discharging phases but also significantly reduces overshoot and settle times of dc voltage to 64.2% and 55.6%, respectively. © 2010-2012 IEEE.

关键词： state of charge

来源：评论

学校读者我要写书评

暂无评论

Flexible peak shaving in coal-fired power plants: A comprehensive review of current challenges, recent advances, and future perspectives

引用

Energy 2025年 327卷

作者： Wu, Chunlei Wang, Chao Hou, Zongyu Wang, Zhe State Key Laboratory of Power System Operation and Control Tsinghua-Rio Tinto Joint Research Centre for Resources Energy and Sustainable Development International Joint Laboratory on Low Carbon Clean Energy Innovation Institute for Carbon Neutrality Department of Energy and Power Engineering Tsinghua University Beijing100084 China Shanxi Research Institute for Clean Energy Tsinghua University Shanxi 030032 China

Grid stability amidst the global energy transition and the pursuit of carbon neutrality is critically dependent on enhancing the flexible peak-shaving capability of Coal-Fired power Plants (CFPPs). This review highlights recent advances in improving CFPP flexibility and identifies key challenges, including equipment limitations, inadequate control adaptability, and escalating environmental and economic pressures. These factors contribute to operational instability, reduced efficiency, and increased emissions during rapid and deep load fluctuations. Hybrid modeling approaches, achieving high prediction accuracy across full operational processes and broad load ranges with an average error of 0.79 %, support precise peak shaving optimization. Technologies such as low-load stable combustion, heat-power decoupling, and energy storage integration have facilitated minimum loads of approximately 15 %, while advanced intelligent control systems, in coordination with energy storage, significantly accelerate response times, enabling rapid responses within seconds to minutes. Despite these advancements, challenges remain in system coordination, equipment dynamics, and investment feasibility. Future efforts should focus on the development of digital twin frameworks, multi-scale optimization techniques, and integrated techno-economic strategies to propel CFPPs toward cleaner, smarter, and more resilient operations. © 2025 Elsevier Ltd

关键词： Virtual storage

来源：评论

学校读者我要写书评

暂无评论

Bi-level coordinated expansion planning of high-PV-penetration active distribution networks incorporating multiple flexible resources considering WGAN-GP-based uncertainty generation

引用

Energy 2025年 330卷

作者： Jianjing Li Fan Li Kai Sun Bo Sun School of Control Science and Engineering Shandong University Jingshi Road 17923 Jinan 250061 China Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 China

Integrating high-penetration random photovoltaics (PVs) into the active distribution network (ADN) often causes overvoltage issues, which can even trigger ADN failures. To accommodate high-penetration PVs integration while maintaining economic efficiency and flexibility of ADN, a bi-level collaborative expansion planning model considering uncertainty generation and reduction is proposed in this paper. Based on described uncertainty scenarios of PV and load obtained by proposed Wasserstein Generative Adversarial Network with Gradient Penalty (WGAN-GP) and K-means method, the upper level firstly configures soft open points to adjust the ADN topology, then optimizes the siting and sizing of PVs, electric vehicle charging stations, energy storage systems, and active management resources (on-load tap changers, and static var compensators) with minimum investment cost. Lower level uses multi-objective mixed-integer second-order cone programming (MISOCP) model with network loss, PV curtailment and voltage deviation of different attributes to optimize ADN scheduling. To solve this planning model, a hybrid algorithm that integrates an adaptive particle swarm optimization algorithm with SOCP is proposed, employing the technique for order preference by similarity to an ideal solution (TOPSIS) to address the multi-objective issue. Finally, the presented model was tested in the actual rural 41-bus and urban 40-bus ADN of Gansu, China, demonstrating that total costs decreased by 14.4 % and 12.5 % respectively compared to plans without active management resources.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Weak Coupling Effects in the PLL Modes of Grid-Following PMSG Wind power systems

引用

IET Renewable power Generation 2025年第1期19卷

作者： Xumeng Cui Lei Chen Kaiyuan Hou Yong Min Kefei Wang Fei Xu Department of Electrical Engineering Tsinghua University Beijing China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China State Grid Northeast China Branch Shenyang China

Small-signal synchronisation stability is a critical issue of grid-connected permanent magnet synchronous generator (PMSG) wind power systems employing grid-following voltage source converters (VSCs). While most studies simplify the system by modelling multiple VSCs as a single unit to analyse oscillations caused by VSC-grid interactions, few have examined interactions among VSCs. This paper proposes the cross-synchronising coefficient to quantify these interactions and applies it to analyse small-signal synchronisation stability in multi-PMSG wind power systems. When considering only PLL, the cross-synchronising coefficient is analytically derived and generally small, or even zero, indicating weak coupling between the synchronisation dynamics of different grid-side converters. Unlike strong synchronising interactions among nearby synchronous generators, the interaction between the PLL dynamics of PMSG converters remains weak even at short electrical distances. When outer control loops are included, the interaction increases but remains moderate. These findings suggest that the weak coupling of PLL modes in PMSG wind power systems allow for independent stability analysis and control design. Simulation results validate the theoretical analysis, offering insights into the small-signal synchronisation stability of PMSG wind power systems.

关键词： permanent magnet generators phase locked loops small-signal synchronization stability voltage-source convertors weak coupling wind farm design and operation wind power

来源：评论

学校读者我要写书评

暂无评论

Fuzzy optimal scheduling of hydrogen-integrated energy systems with uncertainties of renewable generation considering hydrogen equipment under multiple conditions

引用

Applied Energy 2025年 393卷

作者： Song, Jianzhao Wang, Na Zhang, Zhong Wu, Hao Ding, Yi Pan, Qingze Pan, Xingzuo Shui, Siyuan Chen, Haipeng Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China Department of Electrical Engineering Northeast Electric Power University Jilin132012 China Gansu Branch of Luneng New Energy Group Co. Ltd. Lanzhou730000 China Lanzhou Power Supply Company State Grid Gansu Electric Power Co. Ltd. Lanzhou730000 China TBEA Shenyang Transformer Group Co. Ltd. Shenyang110144 China Northeast Electric Power University Jilin132012 China

Developing hydrogen-integrated energy systems (HIES) represents a cutting-edge strategy for harnessing renewable energy (RE). However, the inherent unpredictability and variability of RE significantly increase the operational uncertainty of HIES, which leads to severe energy curtailment issues when HIES integrates large-scale RE, necessitating greater operational flexibility in the system. To address the challenges, this paper proposes a fuzzy optimal scheduling approach for HIES that considers the hydrogen equipment under multiple operating conditions. The analysis begins by examining the operational mechanisms of hydrogen equipment. Subsequently, a multi-conditions model is developed for electrolyzers, while a reserve model is established for hydrogen fuel cells. Furthermore, the fuzzy chance constraint (FCC) is employed to quantify the uncertainty of RE generation. An integrated demand response mechanism is implemented, incorporating human thermal comfort and building thermal inertia. Finally, a fuzzy optimization scheduling model for HIES is constructed to minimize the total operating costs. The crisp equivalent of FCC is derived to solve this model, thereby transforming the scheduling model based on fuzzy chance-constrained programming into a solvable mixed-integer programming model. The simulation results indicate that the proposed scheduling method can reduce the overall costs of the HIES by 17.98 % and increase the RE accommodation rate by 19.67 %, validating the effectiveness of the method in enhancing the operational flexibility of the HIES. In addition, this study achieves a balance between economic efficiency and reliability, offering a better economy, lower energy curtailment rates, and faster decision-making times compared to robust optimization, scenario analysis, and other common fuzzy optimization methods. © 2025

关键词： Risk perception

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：