检索结果-内蒙古大学图书馆

Conference on Computer Vision and Pattern recognition (CVPr)

作者： Huantong Li Xiangmiao Wu Fanbing Lv daihai Liao Thomas H. Li Yonggang Zhang Bo Han Mingkui Tan South China University of Technology Information Technology R&D Innovation Center of Peking University Changsha Hisense Intelligent System Research Institute Co. Ltd School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen China Hong Kong Baptist University Key Laboratory of Big Data and Intelligent Robot Ministry of Education PengCheng Laboratory

Zero-shot quantization (ZSQ) is promising for compressing and accelerating deep neural networks when the data for training full-precision models are inaccessible. In ZSQ, network quantization is performed using synthetic samples, thus, the performance of quantized models depends heavily on the quality of synthetic samples. Nonetheless, we find that the synthetic samples constructed in existing ZSQ methods can be easily fitted by models. Accordingly, quantized models obtained by these methods suffer from significant performance degradation on hard samples. To address this issue, we propose HArd sample Synthesizing and Training (HAST). Specifically, HAST pays more attention to hard samples when synthesizing samples and makes synthetic samples hard to fit when training quantized models. HAST aligns features extracted by full-precision and quantized models to ensure the similarity between features extracted by these two models. Extensive experiments show that HAST significantly outperforms existing ZSQ methods, achieving performance comparable to models that are quantized with real data.

关键词：

来源：评论

学校读者我要写书评

暂无评论

design and Implementation of Security Protection for Service Call in New Generation dispatching Technology Support system

Design and Implementation of Security Protection for Service...

引用

Information Science, Parallel and distributed systems (ISPdS), International Conference on

作者： Qiang Yi Shupeng Wan Ping Zhang Zhemin Wang Yuhao Tang rui Tao NARI Group Corporation(State Grid Electric Power Research Institute) NARI Technology Co. Ltd Nanjing China NARI Control System Co. Ltd Nanjing China System R&D Center NARI Group Corporation(State Grid Electric Power Research Institute) NARI Technology Co. Ltd Nanjing China

To meet the needs of future power system development and safe, stable, and high-quality operation, it is proposed to build a new generation of dispatching technology support system. The new generation dispatching technology support system fully inherits the achievements of the smart grid dispatch control system, inherits the boundary security protection strategy of the original smart grid dispatch control system, and provides comprehensive security protection for all internal links of the system. This paper introduces the use of secure communication bus, security reinforcement based on authentication and encryption technology, and the use of signature verification, encryption and decryption, Anti-replay and other secure communication technologies for communication transmission between applications.

关键词：

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

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

引用

Electrical Engineering and Automation (IFEEA), International Forum on

作者： Yihua Zhu Yun Hu Liang Tu Mingzhang Su Chao Luo State Key Laboratory of HVDC Electric Power Research Institute CSG 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 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Exploration and Practice of Substation Monitoring diagram Verification in Automatic Acceptance of Power Grid dispatching system

Exploration and Practice of Substation Monitoring Diagram Ve...

引用

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

作者： Xiong Wan Yanghao Zhou Yafei Jia Xiaoying Liu Wenjing Chen Songtao Zhao National Electric Power Dispatching and Control Center State Grid Corporation of China Beijing China NARI Research Institute System Platform R&D Center NARI Technology Co. Ltd Nanjing China Xiong'an Electric Power Dispatching & Control Center Company of State Grid Hebei Electric Power Co. Ltd. Xiong'an China NARI Research Institute Quality Control Center NARI Technology Co. Ltd Nanjing China Nanjing Power Distribution Technology Branch of NARI NARI Technology Co. Ltd Nanjing China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

When a substation is newly built, renovated, or expanded, it is necessary to conduct acceptance checks on the monitoring information connected to the control system. Traditional automatic acceptance of substations uses data check at the master system through only background and station side processes, while monitoring personnel often monitor substation operations through wiring diagrams, which poses a risk of misrepresentation of information and poses a safety risk to the operation of the power grid. This article designed a method for verifying diagrams for monitoring based on wiring diagram analysis and verification, complemented the automatic acceptance logic for the entire process of monitoring images from the slave end to the master end, and applied it to practical engineering applications. (Abstract)

关键词： Wiring Substations control systems Power grids Main-secondary dispatching Safety

来源：评论

学校读者我要写书评

暂无评论

Comparison and Testing of Equivalent Modeling Methods for Wind Farm Composed of doubly-Fed Induction Generators

Comparison and Testing of Equivalent Modeling Methods for Wi...

引用

IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Binjiang Hu Yihua Zhu Liang Tu Zun Ma Xian Meng Chao Xing State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

For analyzing the power system with high penetration of wind power, it is important to establish accurate models of wind turbines and wind farms, which is a basic and important work. In the analysis of wind power grid integration, it is necessary to aggregate the equivalent value of the wind farm into one or a few wind turbines. At present, there are two commonly used equivalence methods: current source multiplication (commonly used in commercial software) and full dynamic aggregation method. The former achieves wind farm equivalence by multiplying the output current of a single wind turbine generator, while the latter dynamically aggregates the wind farm into one or several large wind turbine generators. There is still a lack of research on the differences between the two. Based on the actual wind farm structure, this paper studies the electrical characteristics of steady-state operation and transient fault ride through operation using single machine dynamic aggregation method and current source multiplication method separately, and compares the equivalent simulation results with the detailed wind farm simulation results. The equivalent accuracy of the single machine aggregation method and the current source multiplication method is calculated to provide a reference for method selection in wind farm equivalent modeling.

关键词： reactive power Accuracy Simulation Power system dynamics doubly fed induction generators Wind farms Generators Wind turbines Impedance Transient analysis

来源：评论

学校读者我要写书评

暂无评论

Performance Improvement for the Cmos rail-to-rail Amplifier Via Apso-Based design and Snn's Training

SSRN

引用

SSrN 2023年

作者： Liu, Xianming Wu, Shihong Xiao, Wenrun Zhao, Chenhui Guo, donghui School of Electronic Science and Engineering R&D Center of Integrated Circuit Xiamen University Fujian Xiamen361005 China School of Physics Electronics and Intelligent Manufacturing Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua University Hunan Huaihua418000 China Ningbo Institute of Artificial Intelligence Industry Zhejiang Ningbo315100 China

In this paper, a Spiking Neural Network optimization assisted design method for analogintegrated circuits is proposed. The optimization procedure includes adaptive particle swarmoptimization(APSO) search program and SNN Training. The application of APSO algorithmachieves global optimization, and the sample practical user-defined specifications are simulatedby SPICE parallelly. Then, the sampled practical data and the optimal result is used for traininga spiking neural network(SNN) model, and the optimal fitness value is calculated and ranked byAPSO algorithm. The SNN model is used to capture the relation between the inputs (transistorsize, currents) and outputs (frequency characteristic) of the circuit module. The optimizationframework for performance improvement is applied in a rail-to-rail amplifier with constant gmtechnology. Simulation results show that the performance is enhanced obviously by the proposedoptimization algorithms. Compared with traditional approaches, the proposed method providesabout one times speed enhancement and the accuracy of SNN model is up to 99.73%. © 2023, The Authors. All rights reserved.

关键词： Neural network models

来源：评论

学校读者我要写书评

暂无评论

Performance Analysis of the Modified Flux-Coupling-Type SFCL in VSC-HVdC system

Performance Analysis of the Modified Flux-Coupling-Type SFCL...

引用

Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Khakroei Ashkan Mirzaei rajeooni Mahdi rahimi Pirbasti Hossein Heydari MAPNA Electric & Control Engineering & Manufacturing Company (MECO) Alborz Iran Department of Engineering and R&D MAPNA Generator Engineering and Manufacturing Company (PARS) Alborz Iran Department of Electrical Engineering (Center of Excellence for Power System Automation and Operation) Iran University of Science and Technology (IUST) Tehran Iran

Although Voltage Source Converters based on HVdC (VSC-HVdC) systems have several advantages, they are vulnerable to dC fault currents. Concerning the inherent characteristics of high-temperature superconducting (HTS) material, using HTS in the fault current limiter could be a solution to limit the current in VSC-HVdC. The present paper seeks to provide an elaborately better solution to the problem mentioned above of the fault currents than what has previously been proposed. The object of this research is a modified flux coupling type superconductor fault current limiter (MFC-SFCL) to attenuate the fault current in VSC-HVdC network. The principle mechanism and operation of the SFCL and VSC-HVdC systems are modeled in detail, involving interplay or synergy between electrical and thermal properties. The simulation results demonstrate that the purposed MFC-SFCL has the proper function to mitigate the fault current.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Active Thermal control of Grid-Forming Converters Based on dC-link Voltage Synchronization

Active Thermal Control of Grid-Forming Converters Based on D...

引用

IEEE International Conference on Power and Power and renewable Energy (ICPrE)

作者： Mingqun Liu Guanming Zeng Xin He Liang Tu Peng He Yihua Zhu Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming Yunnan State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

Grid-forming control, as a key technology for building new power systems, enables inertia and damping characteristics of converters to actively support grid frequency and voltage. However, GFM-based converters are often required to generate short-circuit currents in excess of the rated value to support grid voltage recovery during transient faults, which poses a greater challenge to their electro-thermal stresses. At the same time, the over-issuance of short-circuit current will lead to the aggravation of junction temperature fluctuation, which will shorten the lifetime of the power devices and bring new challenges to their reliability. Based on the above problems, this paper firstly establishes a corresponding electrothermal coupling model for the GFM converter synchronized based on dC voltage. Subsequently, an active thermal control technique based on the adaptive adjustment of switching frequency is proposed, which can not only reduce the junction temperature of the power device under the same short-circuit current amplitude, but also further reduce the junction temperature fluctuation of the power device. Finally, the corresponding circuit as well as thermal circuit models are established by simulation software to verify the effectiveness of the strategy.

关键词： Adaptation models Fluctuations Switching frequency Short-circuit currents control systems Temperature control Junctions Transient analysis Voltage control Grid forming

来源：评论

学校读者我要写书评

暂无评论

research on Wind Turbine control Hardware in Loop real-time Simulation and its Application

Research on Wind Turbine Control Hardware in Loop Real-time ...

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Guanming Zeng Liang Tu Yihua Zhu Chengxiang Li Mingqun Liu Peng He State Key Laboratory of HVDC and CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid and National Energy Power Grid Technology R&D Centre and Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou Guangdong Yunnan Power Grid Co. Ltd. Electric Power Research Institute Kunming Yunnan

With the construction of new power system, high-capacity renewable energy sources including wind power are integrated into the power system, whose transient response characteristics have a significant impact on the safe and stable operation of both renewable energy sources and power system. real-time simulation has become an effective method to study interaction between high-capacity renewable energy sources and power system because of its high accuracy and reliability, and precise wind turbine real-time simulation model is of great significance in research mentioned above. Therefore, the wind turbine control hardware in loop (CHIL) real-time simulation method is proposed in the paper, whose feasibility and accuracy are also verified by comparing simulation data from CHIL platform and on-site testing data. It’s further used in the analysis of large-scale offshore wind farm cluster and connected power system as a practical reference case.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Cyber-Attack risk Assessment and Prevention Strategy of Substations Based on dynamic Attack and defense Game

Cyber-Attack Risk Assessment and Prevention Strategy of Subs...

引用

Power system and Green Energy Conference (PSGEC)

作者： Feng Lin Yong Mei Yihua Zhu dongxu Chang ren Liu Hengdao Guo Power Dispatch and Control Center China Southern Power Grid GuangZhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid GuangZhou China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid GuangZhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation & Control for New Energy Power System GuangZhou China

With the improvement of the informatization of the power system, the risk of cyber attack is also increasing. This paper proposes a risk assessment and prevention strategy for cyber attack against substations. Firstly, the cyber attack against substations are modeled based on the game theory of dynamic attack and defense. Secondly, an improved OPA (OrNL-PSErC-Alaska) model is utilized to analyze the cascade failure after cyber attacks and quantify the load loss of power system. Finally, a preventive strategy which can mitigate the expectation load loss caused by cyber attack against substations is put forward. Simulation experiments were conducted to validate the effectiveness of the proposed method.

关键词：

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：