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检索条件"机构=State Key Laboratory of Smart Power Grid Protection and Control"

共 534 条记录，以下是281-290 订阅

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A Fault Ride-Through Method of Paralleled Synchronous and Virtual Synchronous Generators in Islanded Microgrids 5

A Fault Ride-Through Method of Paralleled Synchronous and Vi...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Ru, Yanfei Zhao, Feng Jin, Zhangtao State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China College of Electrical and Information Engineering Hunan University Changsha410082 China

ISBN: (纸本)9781665434256

With the development of distributed power generation technologies, parallel operations of virtual synchronous generators (VSGs) and synchronous generators (SGs) become increasingly common in a microgrid. Due to the low overcurrent capacity of VSGs, fault ride-through (FRT) is necessary for microgrids, which makes the transient stability of SG-VSG-based microgrids be different from the traditional power system. In this paper, a new abnormal overcurrent phenomenon caused by FRT is discovered in SG-VSG-based islanded microgrids. Then, characteristics of the output current of the VSG which uses different parameters are compared and analyzed. Furthermore, an optimized FRT method is proposed, which suppresses the abnormal overcurrent. Finally, a simulation is performed to verify the effectiveness of the proposed method on the PSCAD/EMTDC. © 2021 IEEE

关键词： Synchronous generators

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Research Overview of the protection and Location Technologies for a Flexible DC Distribution Network 5th

Research Overview of the Protection and Location Technologie...

引用

International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Hu, Zilong Wu, Tonghua Li, Xindong Hong, Feng Zheng, Xiaojiang Zheng, Kuncheng State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nanjing211106 China College of Energy and Electrical Engineering Hohai University Nanjing210098 China

ISBN: (纸本)9789811597459

Due to the advantages of flexible control, good power quality, and convenient connection to distributed energy, flexible DC distribution networks have become a hot research topic around the world. However, the protection and location technologies for DC distribution networks are one of the main technical difficulties that confine their large-scale application, so it is necessary to overcome these difficulties as a matter of urgency. This paper presents an overall introduction to the research statuses of the fault features, protection principles, and fault location technologies of a DC distribution network. First, the fault features of a flexible DC distribution network are analyzed based on two-level VSC converter and modular multilevel converter. Second, the protection principles and fault location technologies of a DC distribution network as well as the main principles, advantages, and disadvantages of different technologies are analyzed. Third, the outlook for the development of protection and location technologies for a DC distribution network is determined. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Location

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Study on Propagation Process and Signal Acquisition of Traveling Wave for HVDC Transmission Line 1

引用

International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Chen, Yulin Zhao, Yucan Xian, Guangquan Zhang, Jianfeng Zhang, Jie State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China Nanjing NR Electric Co. Ltd. Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

Traveling wave fault location is very important for high voltage direct current (HVDC) transmission lines. The attenuation and distortion of traveling wave in HVDC transmission lines and secondary circuits will have non-ignorable negative impact on traveling wave fault location. In this paper, the attenuation and dispersion characteristics of traveling wave at different fault distance are simulated and analyzed. The further attenuation and distortion of traveling wave in the secondary circuit are studied by physical model. The problems of traveling wave reflection caused by the secondary cable and signal interference caused by strong electromagnetic interference are analyzed. Through the analysis of the whole process of traveling wave propagation and acquisition, the necessity of on-site acquisition of traveling wave signal for HVDC transmission line is proved. In this paper, the system scheme and key technology of on-site acquisition of traveling wave signal for HVDC line are given, and the technical feasibility of this scheme is stated. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Electric lines

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A Web Attack Detection Method Based on DistilBERT and Feature Fusion for power Micro-Application Server

A Web Attack Detection Method Based on DistilBERT and Featur...

引用

Advanced Electronics, Electrical and Green Energy (AEEGE), International Conference on

作者： Li Nige Chen Lu Zhao Lei Teng Zhenning Wang Zhiqiang Shao Yiyang Gui Xiaolin State Grid Smart Grid Research Institute Co. Ltd. State Grid Laboratory of Power cyber-Security Protection and Monitoring Technology Nanjing China Shaanxi Province Key Laboratory of Computer Network Faculty of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China

The widespread use of power micro-applications has significantly expanded the attack surface of their server side, thus increasing the risk of vulnerability attacks such as SQL injection, XSS, and CRLF injection. To ensure the security of power systems, these attacks must be detected precisely and timely. Therefore, this paper proposes a server-side web attack detection method based on DistilBERT and feature fusion for HTTP and HTTPS requests. The method treats HTTP and HTTPS requests as text data, specifically, extracts deep semantic features using DistilBERT, and fuses them with well-designed empirical features to comprehensively characterize and classify the request. Consequently, anomalous requests can be detected. The experimental results show that the accuracy, precision, recall, and F1 score of the method on HTTP CSIC 2010 and FWAF datasets are close to or higher than 99%. Compared with other methods as far as we known, this method has better performance and efficiency.

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A Simplified Matching Algorithm of the Carbon Neutrality Path for the Industry Zones

A Simplified Matching Algorithm of the Carbon Neutrality Pat...

引用

IEEE Innovative smart grid Technologies - Asia (ISGT Asia)

作者： Jingqi Jin Nan Li Yening Lai Jie Huang Xuetong Chen State Key Laboratory of Smart Grid Protection and Control NARI Technology Co. Ltd. Nanjing China State Grid Qinghai Electric Power Company Economic and Technological Research Institute Xining China

ISBN: (纸本)9798350399677

After the carbon peaking and carbon neutrality goals were determined, industrial zones with high energy consumption began investigating their own carbon emission paths and formulating carbon emission reduction strategies. According to the zone's carbon emission projections, a reasonable estimate of the long-term carbon neutrality curve can be made, which has significant research implications for describing the carbon emission path and formulating carbon emission reduction measures. This paper uses the modified Kaya identity to build a model of the zone's carbon emissions. It proposes an algorithm for the zone's carbon-neutrality path matching the carbon peak path and determines the carbon emission peak year and carbon budget of the zone for achieving carbon peaking and carbon neutrality goals.

关键词： Industries Energy consumption Asia Carbon neutral smart grids

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Transient Stability Analysis and Enhancement of an Islanded Microgrid with grid-forming Converters and grid-following Converters

Transient Stability Analysis and Enhancement of an Islanded ...

引用

power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Dept. of Electrical Engineering Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

The rising integration of renewable energy through power electronic converters has heightened the susceptibility of islanded microgrids to transient instability under large disturbances, primarily due to the converters’ low inertia and high nonlinearity. For an islanded microgrid with multiple converters, this paper estimates its transient stability based on Takagi-Sugeno method and introduces a phase compensation-based control strategy to enhance its transient stability. By incorporating angle difference between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Simulation results validate the analysis and effectiveness of this strategy.

关键词： grid following Simulation Microgrids power system stability Stability analysis power electronics Takagi-Sugeno model Transient analysis power generation grid forming

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Current Compensation-Based Transient Stability Enhancement for an Islanded Microgrid

Current Compensation-Based Transient Stability Enhancement f...

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power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Dept. of Electrical Engineering Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

With the increasing incorporation of renewable energy via power electronic converters, islanded microgrids are susceptible to transient instability when faced with large disturbances, attributed to converters’ low inertia and high nonlinearity. This paper introduces a current compensation-based control strategy to enhance transient stability of an islanded MG. By incorporating frequency deviation between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Compared with previous stability-enhanced method, the proposed strategy demonstrates superior performance in the aspect of small overshoot and fast convergence. Simulation results validate the analysis and effectiveness of this strategy.

关键词： Simulation grid following Microgrids power system stability Stability analysis power electronics Transient analysis Frequency control power generation grid forming

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Study on Robust Estimation of Combined Heat and power Networks based on Huber Estimation

Study on Robust Estimation of Combined Heat and Power Networ...

引用

2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Hu, Yunlong Wang, Qi Ni, Ming Yang, Yi Zhu, Yongkang Yao, Xiecheng Nanjing Normal University College of Electrical and Automation Engineering Nanjing China Nari Group Corporation State Key Lab of Smart Grid Protection and Control Nanjing China State Grid Jiangsu Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414395

Combined heat and power state estimation is the basis for safety assessment, optimal dispatching and other functions in multi-flow energy management centers, and has important theoretical value and practical significance. The measurement system inevitably has gross errors or bad data. The traditional weighted least squares method can't restrain its influence, so the robust estimation method of combined heat and power network based on Huber estimation is proposed. The results of calculation examples show that the proposed method has good robustness and can restrain the influence of gross errors on the estimation accuracy. © 2021 IEEE.

关键词： Electric power transmission networks

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Research on the differential protection of the SFC output transformer for pumped storage hydro unit

Research on the differential protection of the SFC output tr...

引用

2021 International Conference on Information Technology and Intelligent control, CITIC 2021

作者： Long, Feng Wan, Luofei Pan, Shuyan Liu, Xiaobao Wang, Zhonglang Zhao, Ruichen State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China NARI Technology Co. Ltd. Jiangsu Nanjing211106 China

Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Energy utilization

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ANovel SCUC Model Considering Area control Errors and Resulting Penalties 7

ANovel SCUC Model Considering Area Control Errors and Result...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Miao, Yuancheng Song, Bingbing Wang, Lifeng Teng, Xiaobi Li, Yutong Chen, Zijie Chen, Sijie East China Branch of State Grid Corporation of China Shanghai China College of Smart Energy Shanghai Jiao Tong University Shanghai China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9798350345094

The traditional Security Constrained Unit Com-mitment (SCUC) model focuses on minimizing the total cost of electricity generation while ensuring system security and reliability. However, this model does not consider the possibility that Independent System Operators (ISOs) can intentionally allow for area control errors (ACE) to reduce energy purchase costs. This article incorporates ACE and its associated penalties into the SCUC model. Given specific penalty prices, the model can reflect the impact of considering ACE on an ISOs' power pur-chasing decisions. Experimental results show that when penalty prices are relatively low, ISOs are more profitable by generating ACE and paying penalties than by purchasing electricity from other ISOs or purchasing demand response from flexible loads. Therefore a high-enough penalty price is necessary to ensure system reliability. © 2023 IEEE.

关键词： Errors

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