检索结果-内蒙古大学图书馆

Enhancing Mg 2+ intercalation in MnO 2 /carbon composites via vanadium doping and oxygen vacancies for high-performance aqueous magnesium-ion batteries

引用

Journal of Electroanalytical Chemistry 2025年 991卷

作者： Shu Liu Rui Zhang Xiaoyang Deng Ning Wang Xingai Wang Haichang Zhang Yue Li Fei Ding School of Materials Science & Engineering Hebei University of Technology Tianjin 300401 China State Key Laboratory of Intelligent Power Distribution Equipment and System Hebei University of Technology Tianjin 300401 China School of Electrical Engineering Hebei University of Technology Tianjin 300401 China Institute of New Carbon Materials School of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

MnO 2 is a promising cathode material for rechargeable aqueous magnesium ion batteries (AMIBs) due to its high specific capacity and high discharge voltage. However, MnO 2 suffers from structural instability and slow diffusion kinetics of Mg 2+ , which limit its cycle life and rate performance. In this study, a vanadium (V)-doped, oxygen vacancy (O vac )-rich birnessite-type MnO 2 loaded on a conductive three-dimensional (3D) carbon network composed of carbon nanotubes (CNTs) and reduced graphene oxide (rGO), referred to as V-O vac -MnO 2 /CG, was designed to enhance the kinetic of electrochemical reaction. For V-O vac -MnO 2 /CG, V doping and O vac greatly reduce the Mg 2+ insertion/extraction energy barrier, provide abundant active sites, and improve its electrical conductivity. As a result, the V-O vac -MnO 2 /CG cathode exhibits excellent electrochemical properties, achieving a specific capacity up to 398 mAh g −1 at a current density of 0.1 A g −1 . At the same time, it exhibits excellent rate capability, providing a capacity of 143 mAh g −1 even at 2 A g −1 . In addition, after 500 cycles at a current density of 0.2 A g −1 , the capacity retention rate of V-O vac -MnO 2 /CG is still as high as 81 %. These properties make V-O vac -MnO 2 /CG a highly promising cathode material in the field of AMIBs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Event-driven Fast Frequency Response Based on Fuzzy Logic Controller 3

Event-driven Fast Frequency Response Based on Fuzzy Logic Co...

引用

3rd IEEE International Conference on Automation, Electronics and Electrical Engineering, AUTEEE 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Li, Chen Guo, Qi Zhu, Yihua Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China Electric Power Research Institute China Southern Power Grid Power System Simulation and Control Technology Research Department Guangzhou China

ISBN: (纸本)9781728198279

The increasing penetration of renewable energy sources (RESs) brings about critical challenges on power system frequency stability. More specially, the RESs are integrated into power systems through electronic converters, and provide less inertia to counter frequency deviations after contingencies. This paper proposes an event-driven fast frequency response (EFFR) approach based on fuzzy logic controller (FLC), in order to improve the frequency control under serious contingencies. An event-driven control framework is established, in which the contingencies and corresponding disturbance power are monitored. And once the specific contingencies are detected, the EFFR scheme will be actuated rapidly. Then, the FLC is employed to attain the control commands for EFFR, which are the required extra power of controlled units. Using the disturbance power and frequency deviation as input variables, the FLC can consider both the occurred contingencies and current power system states simultaneously. A case study is carried out to verify the feasibility and effectiveness of the proposed approach. © 2020 IEEE.

关键词： Frequency response

来源：评论

学校读者我要写书评

暂无评论

A novel computational cost-effective approach in elastodynamic analysis with rotationally periodic symmetry

引用

Finite Elements in Analysis and Design 2025年 249卷

作者： Wang, Chongshuai Wang, Jia Yu, Yang Yang, Haitian State Key Laboratory of Intelligent Power Distribution Equipment and System School of Electrical Engineering Hebei University of Technology Tianjin300401 China State Key Lab of Structural Analysis for Industrial Equipment Department of Engineering Mechanics International Research Centre for Computational Mechanics Dalian University of Technology Dalian116024 China College of Civil Engineering Jilin Jianzhu University Changchun130118 China

A novel computational cost-effective approach is presented for 2D elastic dynamic analysis by utilizing rotationally periodic symmetry. The proposed algorithm is developed on the platform of TPAA-SBFEM, integrating all its advantages. By recourse of TPAA, an elastic dynamic problem is converted into a series of recursive spatial problems which are solved by SBFEM. The block-circulant SBFEM global stiffness and mass matrices are derived for the structures with or without a common node under a symmetry-adapted reference coordinate system. Notably, these matrices are constructed based on a basic symmetric part, rather than the entire computational domain. Subsequently, a partitioning algorithm is presented to solve the system equation with block-circulant coefficient matrices via a series of small independent subproblems. This leads to significant reductions in both the computational cost associated with matrix construction and the solving of the system equation. In addition, the Woodbury formula is employed to reduce the computational cost in dealing with incomplete rotationally periodic symmetric structures. Three numerical examples are provided to elucidate the features of the proposed approach. © 2025 Elsevier B.V.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Design of micro dynamic simulation system for power system with wind power and VSC-HVDC 4

Design of micro dynamic simulation system for power system w...

引用

4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Sun, Leshu Zhang, Hengxu Cao, Yongji Li, Changgang Guo, Qi Zhu, Yihua Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China Electric Power Research Institute China Southern Power Grid Power System Simulation and Control Technology Research Department Guangzhou China

ISBN: (纸本)9781728196060

The excessive use of fossil energy has huge impacts on environment. The energy revolution with optimized energy structure has been advocated. At this background, the main development direction of energy structure is to increase the proportion of renewable energy to the grid. The two main kinds of power system analysis methods is digital simulation relying on electromagnetic or electromechanical transient software and the dynamic simulation composed by physical elements. Traditional dynamic system can only meet the requirement of AC transmission system simulation and is difficult to be expanded with new elements. In this paper, a micro dynamic simulation system is designed according to the similarity theorem. Moreover, the wind power module and VSC-HVDC module are added to meet the requirement of simulating future power systems. In addition, an experimental system based on DSP and FPGA is designed to monitor and control different dynamic elements. © 2020 IEEE.

关键词： Wind power

来源：评论

学校读者我要写书评

暂无评论

Design and Experimental Evaluation of WLR-III

Design and Experimental Evaluation of WLR-III

引用

2023 IEEE International Conference on Robotics and Biomimetics, ROBIO 2023

作者： Li, Xu Fu, Yili Zhejiang University State Key Laboratory of Robotics and System Harbin Institute of Technology State Key Laboratory of Fluid Power and Mechatronic Systems China Harbin Institute of Technology Intelligent Robot Research Center Zhejiang Laboratory State Key Laboratory of Robotics and System Heilongjiang Province Harbin150001 China

ISBN: (纸本)9798350325706

This paper introduces the design and experimental evaluation of WLR-III, which stands for the third-generation hydraulic wheel-legged robot. WLR-III is expected to be applied to disaster scenarios where the mobility, adaptability and manipulation capability are required. Based on the development of the previous two generations of wheel-legged robots, this work continuously optimizes the design to achieve higher mobility and stronger adaptability by reducing weight & inertia. The hydraulic power transmission system adopts a hose-less design method to ensure the robustness of the system. What's more prominent is that the successful development of hydraulic power unit (HPU) enables WLR-III to realize hydraulic power autonomy. In addition, to accomplish all kinds of operational tasks in the rescue scene, the electro-hydraulic hybrid drives anthropomorphic arms with heavy load grippers were developed. Finally, the effectiveness and reliability of design optimization have been evaluated through a series of experiments, including grassland movement, load bearing, obstacle-stepping and tool-operating. To the authors' best knowledge, this is the first time that a hydraulic powered autonomous wheel-legged humanoid robot with the ability to operate simple tools has been developed. © 2023 IEEE.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Advanced Out-of-Step Splitting Protection Simulation Platform with Considering High Frequency Generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

引用

2022 IEEE International Conference on power systems and Electrical technology, PSET 2022

作者： Liu, Ren Zhu, Yukun Zhu, Yihua Chang, Dongxu Wu, Mingkang Huang, Libin a. State Key Laboratory of HVDC b. National Energy Power Grid Technology R&D Centre c. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System d. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665489157

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. Simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results. © 2022 IEEE.

关键词： Simulation platform

来源：评论

学校读者我要写书评

暂无评论

Multi-Lever EarlyWarning forWind and Photovoltaic power Ramp Events Based on Neural Network and Fuzzy Logic

引用

Energy Engineering 2024年第11期121卷 3133-3160页

作者： Huan Ma Linlin Ma Zengwei Wang Zhendong Li Yuanzhen Zhu Yutian Liu Power Grid Technology Center State Grid Shandong Electric Power Research InstituteJinan250003China Shandong Electric Power Dispatching and Control Center State Grid Shandong Electric Power CompanyJinan250012China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan250061China

With the increasing penetration of renewable energy in power system,renewable energy power ramp events(REPREs),dominated by wind power and photovoltaic power,pose significant threats to the secure and stable operation of power *** paper presents an early warning method for REPREs based on long short-term memory(LSTM)network and fuzzy ***,the warning levels of REPREs are defined by assessing the control costs of various power control ***,the next 4-h power support capability of external grid is estimated by a tie line power predictionmodel,which is constructed based on the ***,considering the risk attitudes of dispatchers,fuzzy rules are employed to address the boundary value attribution of the early warning interval,improving the rationality of power ramp event early *** results demonstrate that the proposed method can generate reasonable early warning levels for REPREs,guiding decision-making for control strategy.

关键词： Early warning machine learning power system security renewable energy power ramp event smart grid

来源：评论

学校读者我要写书评

暂无评论

power system Small-signal Stability Assessment Model Based on Residual Graph Convolutional Networks 5

Power System Small-signal Stability Assessment Model Based o...

引用

2021 5th International Conference on Electrical, Automation and Mechanical Engineering, EAME 2021

作者： Su, Yinsheng Guo, Mengxuan Yao, Haicheng Guan, Lin Huang, Jiyu Zhu, Siting Zhong, Zhi Department of Power System Operation China Southern Power Grid Guangzhou China School of Electric Power South China University of Technology Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

Small-signal stability (SSA) is important to power system security. A data-driven approach is established for rapid prediction of the power system oscillation characteristics. The key of the approach is the Graph Convolution Networks (GCN) with residual mechanism, which works to aggregate features from high-dimension steady-state operation information and is denoted as ResGCN (RESidual GCN) in the paper. The residual mechanism helps to overcome the network degradation phenomenon. Both the oscillation frequency and damping ratio of multiple modes can be predicted by the proposed model. The performance of the proposed scheme as well as its adaptability to the power system topological changes is verified on the IEEE 39 Bus system. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Convolution

来源：评论

学校读者我要写书评

暂无评论

Simulation Testing of Large-Scale Grid-Connected Wind power with Energy Storage system Based on Active Support Performance Evaluation Indices 10

Simulation Testing of Large-Scale Grid-Connected Wind Power ...

引用

10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Zhu, Yihua Hu, Yun Tu, Liang Su, Mingzhang Luo, Chao Csg State Key Laboratory of Hvdc Electric Power Research Institute Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China China Southern Power Grid Csg Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China

ISBN: (纸本)9798350309379

This paper establishes simulation modeling for large-scale grid connected wind power with energy storage system (ESS). The conventional grid-following (GFL) based ESS is used as a reference object to test the active support performance of large-scale grid-connected wind power with grid-forming (GFM) based ESS with active support performance evaluation indices in different scenarios. (1) Small disturbance evaluation indices: The point of common coupling (PCC) frequency/voltage drop depth and recovery time. (2) Large disturbance evaluation indices: The PCC frequency/voltage drop depth and rise height after fault removal. The output active/reactive power drop depth and rise height/recovery time after fault removal. (3) Island capability evaluation indices: The PCC frequency/voltage fluctuation amplitude at the moment of switching and system stability after switching. © 2023 IEEE.

关键词： active support performance evaluation indices different scenarios grid-following (GFL) grid-forming (GFM)

来源：评论

学校读者我要写书评

暂无评论

Neural Network technology Applied in Fault Detection and Simulation of power systems 8

Neural Network Technology Applied in Fault Detection and Sim...

引用

8th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2024

作者： Hong, Zeqi Huang, Libin Hu, Yufeng Guo, Haiping Lu, Yuanhong Hu, Binjiang Zhang, Jingyue Luo, Hui Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China National Energy Power Grid Technology R and D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Institute China Southern Power Grid Csg Key Laboratory for Power System Simulation Electric Power Research Guangzhou China

ISBN: (纸本)9798331506230

With the escalating demand for power inspection and equipment maintenance, developing effective algorithms for power system fault detection is crucial for ensuring the safety and stability of power systems. This paper leveragesthe Trellis network, enhanced with an attention module, to significantly improve the Trellis network's capability in recognizing power fault images, thus better addressing fault identification tasks within power systems. Through testing on a self-constructed dataset and comparative experiments with models such as DCNN, RCNN, and DenseNet, the proposed attention mechanismenhanced Trellis network algorithm has demonstrated its effectiveness and superiority in fault detection. © 2024 IEEE.

关键词： power distribution faults

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：