检索结果-内蒙古大学图书馆

IEEE Transactions on Industrial Cyber-Physical systems 2025年 3卷 397-407页

作者： Liuyu Chen Xiaodan Zhang Feng Xiao School of Control and Computer Engineering North China Electric Power University Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

This paper is concerned with the stability problem of cyber-physical systems (CPSs) exposed to denial-of-service (DoS) attacks. In-depth analysis and discussion are made under practical constraints of asynchronous and aperiodic sampling with measurement errors. DoS attacks, which are supposed to be aperiodic, interrupt communication on control channels. A sufficient condition in terms of DoS attack duration and frequency is derived to guarantee the asymptotic stability of the system by combining the Lyapunov’s method, inequality techniques and an iterative method. The stability result is applicable to the estimation of the maximum allowable sampling intervals which are closely related to the convergence speed, and characterizes the trade-off between communication resources and stability performance. Finally, the effectiveness of the theoretical analysis is verified by two simulation examples.

关键词： Asymptotic stability Cyber-physical systems Denial-of-service attack Synchronization Stability criteria Microgrids Protocols power system stability Networked control systems Multi-agent systems

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the effect of H_(2)O and O_(2) on the degradation of SF_(6) by pulsed dielectric barrier discharge

引用

Plasma Science and Technology 2024年第2期26卷 125-131页

作者：李亚龙万昆王宇非张晓星杨照迪傅明利卓然王邸博 Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan 430068People's Republic of China State Grid HuBei Direct Current Company Yichang 443002People's Republic of China CSG Electric Power Research Institute CO.Ltd Guangzhou 510080People's Republic of China

SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power ***,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the *** on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were *** have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of *** the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),*** synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)*** the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),*** the same time,different external gases exhibit different capabilities to regulate decomposition *** addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.

关键词： SF_(6) pulsed dielectric barrier discharge degradation discharge gas

来源：评论

学校读者我要写书评

暂无评论

Effect of Carbon Black Contents on Polypropylene-based Semi-conductive Shielding Materials for power Cables

Effect of Carbon Black Contents on Polypropylene-based Semi-...

引用

Tsinghua University-IET Electrical Engineering Academic Forum 2024

作者： Tong, Cheng Zhang, Xiyu Huang, Shangshi Qin, Si Yao, Chi Liang, Yong Li, Qi He, Jinliang Zhao, Yonggui Xu, Jianjian School of Electrical Engineering Guangxi University Guangxi Nanning China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing China HJ Polymer China Co. Ltd Jiangsu Jiangyin China State Grid Linyi Power Company Shandong Linyi China

ISBN: (纸本)9781837242672

Polypropylene-based semi-conductive shielding materials have emerged as significant areas of research in recent years. This paper has investigated the influence of carbon black contents on the properties of semi-conductive composites. Four specimens have been prepared that impact-resistant polypropylene as the matrix and conductive carbon black as the filler with varying carbon black mass fractions (10%, 20%, 30%, and 40%). The properties of semi-conductive composites have been evaluated including thermal, microstructural, mechanical, and electrical. The findings indicate that carbon black contents significantly influence the mechanical and electrical properties, while its effect on thermal properties are less pronounced. Overall, the semi-conductive composites exhibit optimal properties when the carbon black mass fraction is 30%. © The Institution of Engineering & Technology 2024.

关键词： Cable shielding

来源：评论

学校读者我要写书评

暂无评论

Optimal Auxiliary Frequency control of Wind Turbine Generators and Coordination with Synchronous Generators

引用

CSEE Journal of power and Energy systems 2021年第1期7卷 78-85页

作者： Ming Sun Yong Min Lei Chen Kaiyuan Hou Deming Xia Hangyin Mao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China with Northeast Branch of State Grid Corporation of China Shenyang 110180Liaoning ProvinceChina with State Grid Zhejiang Electric Power Co.LTD. Hangzhou 310007Zhejiang ProvinceChina

Auxiliary frequency control of a wind turbine generator(WTG) has been widely used to enhance the frequencysecurity of power systems with high penetration of renewableenergy. Previous studies recommend two types of control schemes,including frequency droop control and emulated inertia control,which simulate the response characteristics of the synchronousgenerator (SG). This paper plans to further explore the optimalauxiliary frequency control of the wind turbine based on previousresearch. First, it is determined that the virtual inertia control haslittle effect on the maximum rate of change of frequency (MaxROCOF)if the time delay of the control link of WTG is taken intoconsideration. Secondly, if a WTG operates in maximum powerpoint tracking (MPPT) mode and uses the rotor deceleration forfrequency modulation, its optimal auxiliary frequency control willcontain only droop control. Furthermore, if the droop control isproperly delayed, better system frequency response (SFR) willbe obtained. The reason is that coordination between the WTGand SG is important for SFR when the frequency modulationcapability of the WTG is limited. The frequency modulationcapability of the WTG is required to be released more ***, when designing optimal auxiliary frequency controlfor the WTG, a better control scheme is worth further study.

关键词： Frequency droop control power system frequency security rate of change of frequency(ROCOF) virtual inertia control wind turbine generator auxiliary frequency control

来源：评论

学校读者我要写书评

暂无评论

A Core Loss Estimation Method Based on Data-driven Technology with Multi-head Attention Mechanism

A Core Loss Estimation Method Based on Data-driven Technolog...

引用

International Conference on power Electronics and Motion control (IPEMC)

作者： Bowen Su Kai Sun Min Yang Yunhao Xiao Kai Zhang Bo Liu Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Magnetic components play an important role in power electronic equipment, but there is still lack of accurate magnetic core loss estimation model. The data-driven methods are well-developed in recent years, and they are also more robust and accurate than conventional model-driven methods like Steinmetz Equation (SE) and improved Generalized Steinmetz Equation (iGSE). However, existing data-driven methods often focus on single excitation waveform like sinusoidal excitation waveform, which is not robust enough when facing complex excitation waveform with many high-frequency harmonic waveform. This paper presents a data-driven model based on attention mechanism which can capture the inner relationship within the input excitation waveform to present a more accurate core loss estimation results. And the comparison results with Multi-layer Perceptron (MLP) and Long Short-Term Memory(LSTM) models indicates that the proposed model has much more accuracy when facing complex excitation waveform. The proposed model can help to design magnetic components.

关键词： Analytical models Accuracy Computational modeling Magnetic cores Core loss Estimation Process control

来源：评论

学校读者我要写书评

暂无评论

A Simple Open-loop Soft Startup Method Based on Operation Mode Analysis for LCC Converters Used in High-voltage DC power Supply

A Simple Open-loop Soft Startup Method Based on Operation Mo...

引用

International Conference on power Electronics and Motion control (IPEMC)

作者： Kai Zhang Hanyu Liu Kai Sun Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

LCC converters incorporate the stray parameters of high frequency transformer and are commonly employed as the initial stage of high-voltage DC power supplies, enhancing both efficiency and power density. However, the significant overshoot that occurs during the startup phase of high-voltage DC power supply poses considerable difficulties for the circuit. In this article, a simple open-loop soft startup control method is proposed: First, the operation mode analysis method is used to accurately solve the time-domain model of the LCC converter under different duty cycles in continuous current mode (CCM). Second, an open-loop variable duty cycle soft startup control strategy from the energy transmitted view is derived. Finally, soft startup process corresponding to different startup time requirements are verified on a 200V/20kV experimental prototype.

关键词： Analytical models power system measurements power supplies Prototypes High-voltage techniques power electronics High-frequency transformers

来源：评论

学校读者我要写书评

暂无评论

A Fuzzy Hierarchical Strategy for Improving Frequency Regulation of Battery Energy Storage system

引用

Journal of Modern power systems and Clean Energy 2021年第4期9卷 689-698页

作者： Kaifeng Wang Ying Qiao Lirong Xie Jiaming Li Zongxiang Lu Huan Yang School of Electrical Engineering Xinjiang UniversityUrumqiChina State Key Laboratory of Control and Simulation of Power Systems Generation Equipments of Electrical Engineering Tsinghua UniversityBeijingChina

Battery energy storage systems(BESSs)can provide instantaneous support for frequency regulation(FR)because of their fast response ***,purely pursuing a better FR effect calls for continually rapid cycles of BESSs,which shortens their lifetime and deteriorates the operational *** coordinate the lifespan savings and the FR effect,this paper presents a control strategy for the FR of BESSs based on fuzzy logic and hierarchical *** fuzzy logic controller improves the effect of FR by adjusting the charging/discharging power of the BESS with a higher response speed and precision based on the area control error(ACE)signal and the change rate of ACE in a non-linear *** controllers effectively reduce the life loss by optimizing the depth of discharge,which ensures that the state of charge(SOC)of BESS is always in the optimal operating range,and the total FR cost is the lowest at this *** proposed method can achieve the optimal balance between ACE reduction and operational economy of *** effectiveness of the proposed strategy is verified in a two-area power system.

关键词： Battery energy storage system(BESS) frequency regulation(FR) coordinated control strategy optimal depth of discharge charging/discharging threshold

来源：评论

学校读者我要写书评

暂无评论

Fault Diagnosis Method for DC Distribution Networks Based on Semitensor Product Bayesian Networks

Fault Diagnosis Method for DC Distribution Networks Based on...

引用

International Youth Scientific and Technical Conference on Relay Protection and Automation (RPA)

作者： He Wang Shiqiang Li Huanan Yu Jing Bian Bo Wei Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

As distributed generators and new loads spread, grid operations have grown more complex, transitioning from AC to hybrid AC/DC and pure DC distribution grids [1] .

关键词：

来源：评论

学校读者我要写书评

暂无评论

Experimental and numerical studies on buckling and post-buckling behavior of T-stiffened variable stiffness panels

引用

Chinese Journal of Aeronautics 2024年第10期37卷 459-470页

作者： Yan HUANG Yahui ZHANG Bin KONG Jiefei GU Zhe WANG Puhui CHEN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China AVIC Aviation Power Control System Research Institute Wuxi 214063China Chengdu Aircraft Design and Research Institute Aviation Industry Corporation of ChinaChengdu 610091China School of Mechanical Engineering Jiangnan UniversityWuxi 214122China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China China National Key Laboratory of Strength and Structural Integrity Aircraft Strength Research Institute of ChinaXi’an 710065China

Currently,experimental research on variable stiffness design mainly focuses on *** ensure adaptability in practical application,it is imperative to conduct a systematic study on stiffened variable stiffness structures,including design,manufacture,experiment,and *** on the minimum curvature radius and process schemes,two types of T-stiffened panels were designed and *** compression tests have been carried out and the results indicate that the buckling load of variable stiffness specimens is increased by 26.0%,while the failure load is decreased by 19.6%.The influence mechanism of variable stiffness design on the buckling and failure behavior of T-stiffened panels was explicated by numerical *** primary reason for the reduced strength is the significantly increased load bearing ratio of *** experimental investigations of stiffened variable stiffness structures are very rare,this study can be considered a reference for future work.

关键词： Variable stiffness composite Buckling Post-buckling Finite element method Stiffened panels

来源：评论

学校读者我要写书评

暂无评论

The Function Mechanism of Virtual Impedance in Grid-forming Droop control and An Adaptive Parameter Tuning Method for Virtual Impedance Based on Network Equivalent Identification

The Function Mechanism of Virtual Impedance in Grid-forming ...

引用

power Science and Technology (ICPST), IEEE International Conference on

作者： Chenhui Fan Xiaohui Qin Lei Qi Hongzhi Liu Baodi Ding Zhengji Meng State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China Carbon Neutrality Research Center of Power System China Electric Power Research Institute Beijing China Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

The penetration rate of renewable energy and other power electronic sources in the system continues to increase, the strength of the power grid is weakened, and the system security is challenged. Some converters urgently need to adopt grid-forming control, for example, the droop control. However, due to the different impedance characteristics of the power system environment and the varying electrical distances between the grid source and load, the grid-forming converter cannot adapt to traditional droop control in multi-point parallel operation, this condition can be improved by adding virtual impedance. This paper first derives the main function mechanism of virtual impedance taking droop control as an example, and proposes a virtual impedance adaptive parameter tuning method based on network equivalent identification, then verifies the method through MATLAB/Simulink simulation. The proposal of this method is of great significance for reflecting the operational status of the system, improving the adaptability of renewable energy equipment and stations, and enhancing their fault ride-through ability. It also has important value for improving other grid-forming technologies.

关键词： Renewable energy sources Adaptive systems power system stability Stability analysis Impedance Security Proposals

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：