检索结果-南通市图书馆

Comparison of AC breakdown characteristics on insulation paper (pressboard) immersed by three-element mixed insulation oil and mineral oil

引用

High Voltage 2020年第3期5卷 298-305页

作者： Dawei Feng Jian Hao Lijun Yang Ruijin Liao Xin Chen Jian Li state Key Laboratory of Power Transmission Equipment and System Security and New technology School of Electrical EngineeringChongqing UniversityChongqing 400044People's Republic of China

Insulation oil is an important dielectric in power devices,and many studies on mixed insulation oil have been conducted in recent years to improve the performance of insulation *** replace mineral oil directly,the authors previously developed a novel three-element mixed insulation oil successfully;the main parameters of which satisfy the IEC 60296-2012 standard for mineral *** the present study,the AC breakdown properties of insulation paper(pressboard)immersed by the new mixed oil and naphthenic mineral oil were *** both insulation oils,the increase in temperature cannot significantly reduce the breakdown strength of oil-immersed insulation paper(pressboard)at a low moisture content,and the increment of moisture content cannot reduce the breakdown voltage at a low temperature(25℃).The breakdown voltage decreases only when the two factors increase *** the mixed and mineral oils,the AC breakdown voltage of oilimmersed paper(pressboard)with different thicknesses has significant *** mineral oil has a high breakdown voltage for the thin insulation paper,whereas the mixed oil has a high breakdown voltage when the thickness of the insulation paper(pressboard)exceeds 0.2 *** phenomenon is mainly caused by the breakdown field strength that varies with the increase of dielectric thickness and the different change trends of paper(pressboard)immersed with the mixed and the mineral ***,the stack of thin multilayer insulation paper enables the mixed oil-immersed paper to have a higher breakdown strength than the mineral oil-immersed *** the AC breakdown voltage of oil-immersed pressboard with an oil-gap structure,the mixed oil is comprehensively superior to the mineral oil due to its larger relative permittivity.

关键词： insulation immersed breakdown

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Robust Voltage Control Considering Uncertainties of Renewable Energies and Loads via Improved Generative Adversarial Network

引用

Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1104-1114页

作者： Qianyu Zhao Wenlong Liao Shouxiang Wang Jayakrishnan Radhakrishna Pillai the Key Laboratory of Smart grid of Ministry of Education and Tianjin Key Laboratory of Power System Simulation and Control Tianjin UniversityTianjinChina the Department of Energy technology Aalborg UniversityAalborgDenmark

The fluctuation of output power of renewable energies and loads brings challenges to the scheduling and operation of the distribution *** this paper,a robust voltage control model is proposed to cope with the uncertainties of renewable energies and loads based on an improved generative adversarial network(IGAN).Firstly,both real and predicted data are used to train the IGAN consisting of a discriminator and a *** noises sampled from the Gaussian distribution are fed to the generator to generate a large number of scenarios that are utilized for robust voltage control after scenario ***,a new improved wolf pack algorithm(IWPA)is presented to solve the formulated robust voltage control model,since the accuracy of the solutions obtained by traditional methods is *** simulation results show that the IGAN can accurately capture the probability distribution characteristics and dynamic nonlinear characteristics of renewable energies and loads,which makes the scenarios generated by IGAN more suitable for robust voltage control than those generated by traditional ***,IWPA has a better performance than traditional methods in terms of convergence speed,accuracy,and stability for robust voltage control.

关键词： Robust voltage control uncertainty generative adversarial network wolf pack algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Side-Channel Analysis for the Authentication Protocols of CDMA Cellular Networks

引用

Journal of Computer science & technology 2019年第5期34卷 1079-1095页

作者： Chi Zhang Jun-Rong Liu Da-Wu Gu Wei-Jia Wang Xiang-Jun Lu Zheng Guo Hai-Ning Lu School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China ZhiXun Crypto Testing and Evaluation technology Co. Ltd.Shanghai 200240China Crypto Group Electrical Engineering DepartmentInstitute of Information and Communication Technologies Catholic University of LouvainLouvain-la-Neuve B-1348Belgium Shanghai Viewsource Information science and technology Co. LtdShanghai 200240China

Time-division multiple access (TDMA) and code-division multiple access (CDMA) are two technologies used in digital cellular networks. The authentication protocols of TDMA networks have been proven to be vulnerable to side-channel analysis (SCA), giving rise to a series of powerful SCA-based attacks against unprotected subscriber identity module (SIM) cards. CDMA networks have two authentication protocols, cellular authentication and voice encryption (CAVE) based authentication protocol and authentication and key agreement (AKA) based authentication protocol, which are used in different phases of the networks. However, there has been no SCA attack for these two protocols so far. In this paper, in order to figure out if the authentication protocols of CDMA networks are sufficiently secure against SCA, we investigate the two existing protocols and their cryptographic algorithms. We find the side-channel weaknesses of the two protocols when they are implemented on embedded systems. Based on these weaknesses, we propose specific attack strategies to recover their authentication keys for the two protocols, respectively. We verify our strategies on an 8-bit microcontroller and a real-world SIM card, showing that the authentication keys can be fully recovered within a few minutes with a limited number of power measurements. The successful experiments demonstrate the correctness and the effectiveness of our proposed strategies and prove that the unprotected implementations of the authentication protocols of CDMA networks cannot resist SCA.

关键词： authentication protocol cellular authentication and voice encryption (CAVE) code-division multiple access (CDMA) secure hash algorithm 1 (SHA-1) side-channel analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circuit Model with Current Interruption for Hybrid High Voltage DC Circuit Breakers to Achieve Precise Current Experiments

引用

CSEE Journal of Power and Energy Systems 2022年第4期8卷 1250-1260页

作者： Zhonghao Dongye Lei Qi Bing Ji Xiaoguang Wei Xiang Cui state Key Laboratory of Altermate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering University of LeicesterLE17RH LeicesterU.K state Key Laboratory of Advanced Power Transmission technology Global Energy Interconection Research Institute Co.Ld.Beijing 102209China

The current interruption test based on an LC resonance circuit for hybrid DC circuit breakers(HVDC CBs)is widely employed to characterize the current interruption capability of *** order to ensure a high-fidelity replica of the fault current in a high voltage application,this paper first proposes an equivalent model of the test circuit,where not only parasitic resistances but also the threshold voltages and on-state resistances of various semiconductor devices are ***,the analytical formula of the test current is derived by including the working principle of the HVDC ***,the parameter extraction method,which combines finite element analysis and measurements by an impedance analyzer,is given in this *** extracted result implies that,in current interruption transients,equivalent resistances of 500 kV CB are as large as 535 mS,which have a significant influence on current ***,the 34 kV/25 kA current interruption test for the 500 kV CB is *** measured results are proved to be consistent with the analytical results obtained from the proposed model,and the relative error is less than 2%.

关键词： Current interruption test high voltage DC circuit breaker

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Random vortex induced vibration response of suspended flexible cable to fluctuating wind

引用

Applied Mathematics and Mechanics(English Edition) 2023年第12期44卷 2207-2226页

作者： Genjin MU Weiqiu ZHU Maolin DENG Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou 310027China

A popular dynamical model for the vortex induced vibration(VIV)of a suspended flexible cable consists of two coupled *** first equation is a partial differential equation governing the cable *** second equation is a wake oscillator that models the lift coefficient acting on the *** incoming wind acting on the cable is usually assumed as the uniform wind with a constant velocity,which makes the VIV model be a deterministic *** the real world,however,the wind velocity is randomly fluctuant and makes the VIV of a suspended flexible cable be treated as a random *** the present paper,the deterministic VIV model of a suspended flexible cable is modified to a random one by introducing the fluctuating *** the normal mode approach,the random VIV system is transformed into an infinite-dimensional modal vibration *** on whether a modal frequency is close to the aeolian frequency or not,the corresponding modal vibration is characterized as a resonant vibration or a non-resonant *** applying the stochastic averaging method of quasi Hamiltonian systems,the response of modal vibrations in the case of resonance or non-resonance can be analytically ***,the random VIV response of the whole cable can be approximately calculated by superimposing the response of the most influential modal *** numerical simulation results confirm the obtained analytical *** is found that the intensity of the resonant modal vibration is much higher than that of the non-resonant modal ***,the analytical results of the resonant modal vibration can be used as a rough estimation for the whole response of a cable.

关键词： vortex induced vibration(VIV) wake oscillator random response suspended flexible cable fluctuating wind

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Continuous Commutation Failure Suppression Method Based on Self-adaptive Auto-disturbance Rejection Proportional-integral Controller for HVDC Transmission System

引用

Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1178-1187页

作者： Tonghua Wu Yuping Zheng Qipu Liu Guoqiang Sun Xiaohong Wang Xindong Li the College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China NARI Group Corporation Nanjing 211106China state Key Laboratory of Smart grid Protection and Control Nanjing 211106China

Once an asymmetrical fault occurs on the AC side of the receiving-end of a high-voltage direct current(HVDC)transmission system,the current reference will be affected by the control regulation on the DC inverter side and the commutation voltage *** this case,the advance firing angle will fluctuate periodically,causing security threats to the *** the fault cannot be cleared in time,the effect may be even more ***,the traditional proportional-integral(PI)controller cannot effectively suppress the periodic components in the input error signal,which is an important cause of continuous commutation ***,the system requires more time to recover from the *** by this,a selfadaptive auto-disturbance rejection PI controller is proposed in this *** controller has the advantages of fast response speed and strong anti-interference ability of the auto-disturbance rejection *** one hand,it can automatically adjust PI,and the parameters can maintain the system’s adaptive *** the other hand,the discretization process satisfies the computer simulation *** applying the proposed controller to a system under constant current control and extinction angle control,the dynamic response speed can be improved and the robust performance of the system can be ensured when dealing with a wide range of ***,simulation results show that the proposed algorithm can effectively suppress the continuous commutation failure of DC transmission systems.

关键词： High-voltage direct current(HVDC)transmission continuous commutation failure periodic fluctuation self-adaptive auto-disturbance rejection proportional-integral(PI)controller computer simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Active Dynamic Aggregation Model for Distributed Integrated Energy System as Virtual Power Plant

引用

Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 831-840页

作者： Haotian Zhao Bin Wang Xuanyuan Wang Zhaoguang Pan Hongbin Sun Zhen Liu Qinglai Guo state Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijingChina state grid Jibei Electric Power Co. Ltd.BeijingChina

Distributed integrated multi-energy systems(DIMSs)can be regarded as virtual power plants to provide additional flexibility to the power *** paper proposes a robust active dynamic aggregation model for the DIMSs to describe the maximum feasible *** aggregation model includes the power constraints,energy constraints,and ramping constraints to aggregate different types of resources in the *** proposed generator-like and storage-like model does not depend on the ancillary service market and can be directly incorporated into the economic dispatch model of the power system.A novel algorithm based on the column-and-constraint generation algorithm and convex-concave procedure is proposed to solve the two-stage robust optimization problem,which is more efficient than the KKT-based ***,a case study of an actual DIMS is developed to demonstrate the effectiveness of the proposed model.

关键词： Aggregation distributed integrated energy system(DIMS) robust optimization virtual power plant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research progress of the electrochemical impedance technique applied to the high-capacity lithium-ion battery

引用

International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 538-552页

作者： Li-fan Wang Meng-meng Geng Xia-nan Ding Chen Fang Yu Zhang Shan-shan Shi Yong Zheng Kai Yang Chun Zhan Xin-dong Wang Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China China Electric Power Research Institute Beijing 100192China Electric Power Research Institute State Grid Shanghai Municipal Electric Power CompanyShanghai 200437China

The world's energy system is changing ***-ion battery,as a powerful and highly effective energy storage technique,is crucial to the new energy revolution for its continuously expanding application in electric vehicles and *** the entire lifetime of these power batteries,it is essential to monitor their state of health not only for the predicted mileage and safety management of the running electric vehicles,but also for an"end-of-life"evaluation for their *** impedance spectroscopy(EIS)has been widely used to diagnose the health state of batteries quickly and *** this review,we have outlined the working principles of several electrochemical impedance techniques and further evaluated their application prospects to achieve the goal of nondestructive testing of battery *** can scientifically and reasonably perform real-time monitoring and evaluation of electric vehicle power batteries in the future and play an important role in vehicle safety and battery gradient utilization.

关键词： electric vehicle Li-ion battery gradient utilization electrochemical impedance technology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experiments and SPICE simulations of double MgO-based perpendicular magnetic tunnel junction

引用

Chinese Physics B 2021年第4期30卷 518-525页

作者： Qiuyang Li Penghe Zhang Haotian Li Lina Chen Kaiyuan Zhou Chunjie Yan Liyuan Li Yongbing Xu Weixin Zhang Bo Liu Hao Meng Ronghua Liu Youwei Du China Electric Power Research Institute Beijing 100192China School of Physics Nanjing UniversityNanjing 210093China School of science Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Electronics science and Engineering Nanjing UniversityNanjing 210093China state grid Tianjin Electric Power Company Tianjin 300384China Key Laboratory of Spintronics Materials Devices and Systems of Zhejiang ProvinceZhejiang 311300China

We investigate properties of perpendicular anisotropy magnetic tunnel junctions(pMTJs) with a stack structure MgO/CoFeB/Ta/CoFeB/MgO as the free layer(or recording layer),and obtain the necessary device parameters from the tunneling magnetoresistance(TMR) *** loops and current-driven magnetization switching *** on the experimental results and device parameters,we further estimate current-driven switching performance of pMTJ including switching time and power,and their dependence on perpendicular magnetic anisotropy and damping constant of the free layer by SPICE-based circuit *** results show that the pMTJ cells exhibit a less than 1 ns switching time and write energies <1.4 pJ;meanwhile the lower perpendicular magnetic anisotropy(PMA) and damping constant can further reduce the switching time at the studied range of damping constant α <***,our results demonstrate that the pMTJs with the thermal stability factor■73 can be easily transformed into spin-torque nano-oscillators from magnetic memory as microwave sources or detectors for telecommunication devices.

关键词： magnetic tunnel junctions magnetic tunnel junction(MTJ)model switching time spin torque nano-oscillator

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluating and Improving Linear Regression Based Profiling:On the Selection of Its Regularization

引用

Journal of Computer science & technology 2020年第5期35卷 1175-1197页

作者： Xiang-Jun Lu Chi Zhang Da-Wu Gu Jun-Rong Liu Qian Peng Hai-Feng Zhang School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China ZhiXun Crypto Testing and Evaluation technology Co.Ltd. Shanghai 200240China Department of Microelectronics and Nanoelectronics Tsinghua UniversityBeijing 100084China Beijing Smartchip Microelectronics technology Co. Ltd.Beijing 100082China

Side-channel attacks(SCAs)play an important role in the security evaluation of cryptographic *** a form of SCAs,profiled differential power analysis(DPA)is among the most powerful and efficient by taking advantage of a profiling phase that learns features from a controlled *** regression(LR)based profiling,a special profiling method proposed by Schindler et al.,could be extended to generic-emulating DPA(differential power analysis)by on-the-fly *** formal extension was proposed by Whitnall et *** SLR-based ***,to improve SLR-based method,Wang et *** a method based on ridge ***,the constant format of L-2 penalty still limits the performance of *** this paper,we generalize the ridge-based method and propose a new strategy of using variable *** then analyze from a theoretical point of view why we should not use constant penalty format for all *** speaking,our work reveals the underlying mechanism of how different formats affect the profiling process in the context of side ***,by selecting a proper regularization,we could push the limits of LR-based ***,we conduct simulation-based and practical experiments to confirm our ***,the results of our practical experiments show that the proper formats of regularization are different among real devices.

关键词： side-channel attack(SCA) cryptography linear regression based profiling generic-emulating differential power analysis regularization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：