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APT Attack Investigation via Fine-grained Sequence Construction and Learning 3

APT Attack Investigation via Fine-grained Sequence Construct...

引用

3rd International Symposium on Computer Technology and Information Science, ISCTIS 2023

作者： Wu, Tianqi Lv, Zhuo Zhang, Daojuan Qian, Kexiang Wang, Ming State Grid Smart Grid Research Institute Co. Ltd China State Grid Laboratory of Power Cyber-Security Protection and Monitoring Technology Sgri Power Grid Digitizing Technology Department State Grid Henan Electric Power Research Institute State Grid Laboratory of Power Monitoring System Cyber Security Technical Standard Verification

ISBN: (纸本)9798350325386

APT attack investigation aims to provide the security investigators a causal subgraph of the whole causal graph, so that they can easily analyze attacks. However, existing methods either output subgraphs that miss critical attack steps, or are too large and thus challenging to utilize. To address these limitations, we propose a new APT attack investigation approach based on fine-grained sequence construction and learning. Specifically, our approach is built upon the ATLAS framework, and constructs more attack sequences with a finer granularity. It then learns the attack behavior patterns from these constructed sequences. During inference, when presented with an attack symptom, our approach first predicts attack-related nodes in the causal graph and then constructs the causal subgraph based on these nodes. To evaluate our method, we conduct experiments using a simulated environment and four real attacks. The results demonstrate the effectiveness of the proposed approach compared to the state-of-the-art method ATLAS. © 2023 IEEE.

关键词： attack investigation machine learning sequence construction

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Simulation and Verification of Sub-synchronous Oscillation from Impedance Perspective-Taking a Wind Power Base in China as an Example 6th

Simulation and Verification of Sub-synchronous Oscillation f...

引用

6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Xu, Guang Zhu, Ling Li, Jianhua Huang, Zhiguang Li, Zhaowei Hou, Yuqiang NARI Technology Co. Ltd Jiangsu Nanjing211106 China East China Grid Co. Ltd Shanghai200120 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (纸本)9789811671555

Recently, numerous sub-synchronous oscillations (SSO) events have occurred in many wind farms in China, which seriously threatened the power system security and stability. It is generally believed that the LC resonance between the wind farm side and the grid side with series compensation (SC) devices is one of the conditions that cause the SSO. This paper takes a real power grid as an example, reappeared the SSO events through electromagnetic simulation, analyzed the key influence factors, and proposes a strategy from impedance perspective in the end based on reasonable assumptions, in order to suppress the SSO shortly after the oscillations happened. Firstly, make off-line impedance analysis based on the deterministic grid structure, and then give the sensitivity results of each wind farm to the SSO. Finally, cut off the wind farm based on the sensitivity orders during the SSO. The simulation results were performed to verify the validity. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electromagnetic simulation

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Research on Reliability Improvement Scheme of Network in smart Substation 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： Shen, Bing Lu, Zhihao Lv, Hang Yang, Gui Li, Li State Grid Shanghai Municipal Electric Power Company Shanghai200122 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China NR Electric Co. Ltd. Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

The data sharing based on process level network is the development trend of the digitalization of the secondary circuit in smart substation. However, abnormal problems of data transmission such as network storms bring certain hidden dangers to the safe and stable operation of the secondary equipment. In this paper, the main problems affecting the reliability of data transmission are analyzed, and the message management technology based on data flow control is proposed, which can effectively improve the reliability of data transmission. Aiming at the problem of cross-network data exchange, a solution based on cross-network port flow control is also proposed. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Flow control

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Approach for Studying the Impact of Communication Failures on Power grid

Approach for Studying the Impact of Communication Failures o...

引用

IEEE Power and Energy Society General Meeting

作者： Yusheng Xue Ming Ni Wenjie Yu NARI Technology Inc. and State Key Laboratory of Smart Grid Protection and Control

ISBN: (纸本)9781509041695

In smart grid, a strong communication network plays a very important role, which makes the power grid more controllable and observable. It is a very tough task to study the mutual impact between these two systems due to their different characteristics. This paper proposes a generic and systematic approach for quantitatively studying the impact of communication failures on power grid's measurement and control functions. And an example is used to illustrate how to apply the approach in studying the impact of communication failure on a stability control system.

关键词： Communication failure Communication interruption Power system control Stability control system control system stability Power grids Power system control control function Communication Research networks(communications)

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Research and Application of Data on Demand Penetration Retrieval Based on DL/T860CMS Standard 8

Research and Application of Data on Demand Penetration Retri...

引用

8th International Conference on Energy system, Electricity, and Power, ESEP 2023

作者： Zeng, Jincheng Tan, Zhijun He, Mingyi Tian, Hui Gong, Shaoqi Wu, Yongyi Nari Group Corporation State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

To address the continuous growth of equipment scale and the number of measurement points in autonomous and controllable intelligent substations, while existing data collection strategies, equipment modeling methods, and data transmission dimensions cannot meet the requirements of panoramic monitoring and deep data mining analysis for the new-generation of substation centralized monitoring system, this paper proposes a data penetration and retrieval method based on DL/T860 CMS standard. This article introduces the background and technical advantages of the DL/T860 CMS standard, as well as the overall process of on-demand access. It also designs the overall architecture, and discusses in detail the key technologies involved in file access, dynamic dataset access, and remote process *** application results of on-site operation of multiple centralized control systems in Jiangsu, Shandong, Anhui, and other provinces show that on-demand penetration and retrieval services provide reliable technical support for centralized monitoring of substations, effectively improving the monitoring level of the centralized control system regarding the primary and auxiliary equipment of the substation. © 2024 SPIE.

关键词： Data mining

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smart substation network quality monitoring and fault prediction

Smart substation network quality monitoring and fault predic...

引用

2021 International Conference on Power Electronics and Power Transmission, ICPEPT 2021

作者： Li, Chao Peng, Qi Wang, Dehui Luo, Linglu Zuo, Huanhuan NARI Group Corporation State Grid Electric Power Research Institute Nanjing211006 China NARI Technology Co. Ltd. Nanjing211006 China State Key Laboratory of Smart Grid Protection and Control Nanjing210061 China

The smart substation communication network is the basis for information sharing of various devices in the substation. Its operation status has an important impact on the safe operation of the substation and even the power grid. Therefore, real-time status monitoring of the smart substation communication network is becoming more and more important. Aiming at the problems of single dimension, insufficient real-time performance and manual fault analysis in existing substation communication network state monitoring technology, this paper proposes a method of smart substation communication network state monitoring and fault prediction based on network communication quality. This paper uses switch ACL technology and coloring technology to obtain communication quality indexes such as bandwidth utilization, delay, and packet loss rate in real time;based on a multi-dimensional evaluation algorithm, a comprehensive evaluation model of network communication quality is constructed;the model of the relationship between abnormal network communication quality and failures is established. Finally, real-time monitoring of network communication quality and fault prediction are realized. The application analysis in a typical 110 kV substation shows that this method can effectively evaluate the network communication quality and accurately predict failures, and can guide operationer and maintenaner to quickly restore the normal operation of the communication network. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Telecommunication networks

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Research on Man-Machine Service Reliability of New Generation Power system 3

Research on Man-Machine Service Reliability of New Generatio...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Yin, Xia Li, Lulu Lv, Zhimeng Yan, Zhen Xu, Hua Zhao, Kun Huang, Kun Nari Group Corporation State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

With the rapid growth of smart grid dispatching business scale, the traditional fat client mode power system has a large degree of business coupling, which limits the power grid dispatching business. But the lightweight man-machine cloud terminal and man-machine service framework have greatly reduced the coupling degree of the grid dispatching system business. The appearance of man-machine service reduces the development cost of client, and makes the unified browsing of multi system and multi terminal equipment easier. However, how to ensure the reliability and stability of man-machine interaction service is a question worthy of discussion. How to adapt to the interaction of a lot of clients and to adapt to the requests of different clients put forward higher requirements for man-machine service. This article describes the man-machine service architecture and key technologies to ensure reliability, introduces technologies such as load balancing and thread pools that adapt to the characteristics of power grid human-computer interaction, introduces in detail the distributed job scheduling management mechanism within the man-machine service, and describes the standardized request and return result of man-machine service. Finally, through sample testing and on-site operation, demonstrate the reliability of the man-machine service. © Published under licence by IOP Publishing Ltd.

关键词： Reliability

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Reliability Evaluation of Electronic Cabin Smoke Detector Based on FMEA and Arrhenius Mode 12

Reliability Evaluation of Electronic Cabin Smoke Detector Ba...

引用

12th IEEE Global Reliability and Prognostics and Health Management, PHM-Nanjing 2021

作者： Sul, Yan Liang, Xuerui Wen, Tan Civil Aviation College Nanjing University Of Aeronautics And Astronautics China State Key Laboratory Of Smart Grid Protection And Control Nanjing China Civil Aviation College Nanjing University Of Aeronautics And Astronautics Nanjing China

ISBN: (纸本)9781665401302

The high reliability of smoke detectors in the electronic cabin of passenger aircraft is of great significance for reducing the false alarm rate of smoke detection and ensuring the safety of passenger aircraft and passengers. In order to analyze and evaluate the reliability of newly developed smoke detectors, a set of reliability evaluation methods for electronic cabin smoke detectors based on FMEA (failure mode and impact analysis) and Arrhenius models are presented. First of all, based on the principle of the system, the FMEA method is used to analyze and determine the potential failure location, potential failure mode and failure reason of the smoke detector. Then, the RPN (Risk Coefficient) evaluation method based on the expert scoring method determines the priority ranking of failure risks, establishes risk evaluation indicators, conducts risk evaluation on failure modes, and determines high-risk stresses. Finally, for the high-risk stress, a life prediction of the smoke detector in the electronic cabin based on the Arrhenius model is established. The feasibility and effectiveness of the above reliability evaluation method are verified and analyzed by taking a smoke detector in the electronic cabin of a certain type of passenger aircraft as an example. © 2021 IEEE.

关键词： Risk assessment

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Transient Stability Analysis of Paralleled grid-Forming Converters 3

Transient Stability Analysis of Paralleled Grid-Forming Conv...

引用

3rd International Conference on Energy, Power and Electrical Engineering, EPEE 2023

作者： Yang, Kexin Bao, Yanhong Wu, Feng Ren, Xiancheng Zhang, Jinlong Nanjing Normal University Nari Technology Co. Ltd. Nanjing China Nari Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9798350318180

Interaction exists in multiple grid-forming converter parallel systems, resulting in different transient stability issues between multiple converter systems and single converter under large disturbances. During the current limiting period, the external characteristics of the grid-forming converter become current source, which causes three different external characteristic models of parallel converter. In this study, three models of parallel system were established, and the effect of different coupling power directions was analyzed based on the power angle curve. Further, the influence of different parameters of converter was discussed and three different cases of converter transient stability due to interaction was revealed. The interaction between converters is mainly determined by the coupling power direction. When the external characteristics of the converters are the same, the coupling power direction is mainly determined by the power angle. When the external characteristics are different, the coupling power direction is determined by the current limiting strategy. The correctness of the theoretical analysis was verified based on the PSCAD platform. © 2023 IEEE.

关键词： current limiting equal area criterion grid-forming converter paralleled system transient stability

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The Analysis of AC Faults in AC/DC Hybrid Distribution system with SOP 1

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7th Purple Mountain Forum on smart grid protection and control, PMF2022

作者： Jin, Peng Wu, Tonghua Wu, Hai Hu, Guo Shen, Qian NARI Group Co. Ltd. State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211000 China School of Automation Nanjing University of Science and Technology Nanjing210094 China

ISBN: (数字)9789819900633

ISBN: (纸本)9789819900626

AC/DC hybrid distribution system becomes increasingly necessary for integration of distributed renewable energy resources (DER) and management of carbon emissions. However, the fault characteristics of AC/DC hybrid power distribution network are vastly different from traditional AC distribution system for their varied structures. Considering the strong capability in controlling power flow and fault current of soft open point (SOP), this paper establishes the model of AC fault sequence network of hybrid distribution system with SOP, in which positive and negative separation control strategy is adopted by the converter. The model includes traditional AC equivalent network, DC equivalent network, back-to-back converter and its control system, based on which the AC fault characteristics in AC/DC hybrid distribution system are analyzed. Through utilizing PSCAD/EMTDC, different simulation scenarios are carried out to verify the effectiveness of AC fault modeling and analysis method of AC/DC hybrid power distribution system with SOP, thus providing a theoretical basis for AC side protection scheme of AC/DC hybrid system. © state grid Electric Power Research Institute 2023.

关键词： Electric load flow

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