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Remote Attestation for Intelligent Electronic Devices in smart grid Based on Trusted Level Measurement

Chinese Journal of Electronics 2020年第3期29卷 437-446页

作者： WANG Yong LI Jun'e CHEN Xiong LIN Hai YU Fajiang LUO Jianbo Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and Engineering Wuhan University NARI Group Corporation State Grid Electric Power Research Institute NARI Technology Co.Ltd. State Key Laboratory of Smart Grid Protection and Control

To reduce the implementation complexity and excessive overhead caused by remote attestation,we propose a new remote attestation scheme based on trusted level measurement considering the limited system resources of the Intelligent electronic devices(IEDs) in smart grid. In this scheme, a lightweight trusted level measurement mechanism is designed, and a new dynamic weighted multi-classifier integration method based on Binary tree Support vector machine(BT-SVM) is proposed. The trusted level of configuration information and running state of an IED are measured through trusted third party. The measurement parameters and attestation period are dynamically adjusted according to different trusted levels of an IED, so that reducing computational overhead and communication delays in remote attestation process. Analysis and experiments show that the proposed scheme can enhance the security of IEDs in smart grid by occupying a small amount of computation and communication resources.

关键词： smart grid Intelligent electronic devices(IEDs) Remote attestation Trusted level measurement

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Research on Communication Schemes for Digital-Physical Hybrid Simulation of the SSCS 6

Research on Communication Schemes for Digital-Physical Hybri...

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6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Liu, Qitao Xu, Jianbing Xu, Haibo Ding, Zhao Li, Manli Ren, Jinhua Yin, Zhaoyang NARI Technology Co. Ltd State Key Laboratory of Smart Grid Protection and Control Nanjing China State Key Laboratory of Smart Grid Protection and Control School of Electrical of Engineering Nanjing China

ISBN: (纸本)9798350347159

SSCS plays the essential role in power grid operation to ensure the control reliability and effectivity. Due to the power system becomes more complex, it is inevitable to improve the simulation technology for SSCS. Thus, a digital-physical hybrid simulation platform for SSCS is required. In this paper, the requirements of the digital-physical hybrid simulation platform are analyzed and focus on the design of communication schemes for digital-physical hybrid simulation. IEC61850 and Aurora based communication technical roadmaps are proposed for the communication between RTDS and DSSCHP. Also, two options are available for the communication between SSCDs and DSSCHP. © 2022 IEEE.

关键词： Simulation platform

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Research on Chinese Word Segmentation Algorithm based on Dictionary and Statistical Method and Its Application in the field of Power grid control

Research on Chinese Word Segmentation Algorithm based on Dic...

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2022 Global Conference on Robotics, Artificial Intelligence and Information Technology, GCRAIT 2022

作者： Shen, Chao Dai, Jinxia Mao, Mengge Zhao, Kun Yan, Zhen Huang, Kun NanJing China State Key Laboratory of Smart Grid Protection and Control NanJing China

ISBN: (数字)9781665481922

ISBN: (纸本)9781665481922

In view of the particularity of Chinese word segmentation in the professional field of power grid regulation, the performance of Chinese word segmentation based on traditional statistical algorithm is frequently limited by the corpus training in the proprietary field, and the insufficient ability of Chinese word segmentation based on dictionary algorithm in identifying new words and disambiguation in the proprietary field. This paper proposes a Chinese word segmentation method based on the combination of dictionary and statistical method, and applies it to the application scenario of querying the operation status of power grid. This method constructs a professional dictionary in the field of power grid regulation by using the Double-Array Tree storage structure. Then using the CRF(Conditional Random Fields) train the text data to generate the model file, and the FMM(Forward Maximum Matching) method is used for Chinese word segmentation combined with the professional dictionary in the field of power grid regulation. A fast and accurate online word segmentation method in the field of power grid regulation is designed and implemented, it performs well in some main performance indexes. In the application scenario of querying the power grid operation status, the Chinese word segmentation results obtained by this method combined with the standard query sentence pattern realize the rapid classification of application scenario query and the accurate execution of operation commands, greatly improve the efficiency and accuracy of querying the power grid operation status, and improve the human-computer interaction experience. © 2022 IEEE.

关键词： Digital storage

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Decision Support System for Adaptive Restoration control of Distribution System

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1256-1273页

作者： Lili Hao Yusheng Xue Ze Li Haohao Wang Qun Xu School of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816China State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChina State Key Laboratory of Smart Grid Protection and Operation Control NanjingChina State Grid Qingdao Power Supply Company QingdaoChina

Aiming at the high-dimensional uncertainties of restoration process, an optimization model for distribution system restoration control is proposed considering expected restoration benefits, expected restoration costs, and security risks of the overall restoration scheme. In the proposed model, the effect of security control on restoration process is actively analyzed considering the security control costs of preventive, emergency, and correction controls. A two-layer decision support framework for distribution system restoration decision support system(DRDSS) is also designed. The upper layer of the proposed framework generates the pre-adjustment schemes of operation mode for energized power grid by load transfer and selects the optimal pre-adjustment scheme and the corresponding partitioning scheme based on the partition adjustment results of each pre-adjustment scheme. In addition, it optimizes the spatial-temporal decision-making of the inter-partition connectivity. For each partition, the lower layer of the proposed framework pre-selects the units and loads to be restored according to the pre-evaluated restoration income, generates the table of alternative restoration scheme for coping with uncertain events through simulation and deduction, and evaluates the risk and benefit of each *** the uncertain events in the actual restoration process, the current restoration scheme can be adaptively switched to a sub-optimal scheme or re-optimized if necessary. Meanwhile, the proposed framework provides an information interaction interface for collaborative restoration with the related transmission system. A 123-node test system is built to evaluate the effectiveness and adaptability of the proposed model and framework.

关键词： Distribution system restoration pre-adjustment of operation mode load transfer dynamic partitioning risk and benefit security control

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

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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

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Inverse-time Backup protection Based on Unified Characteristic Equation for Distribution Networks with High Proportion of Distributed Generations

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 202-212页

作者： Nana Chang Guobing Song Zhongxue Chang Yuping Zheng Xingang Yang the School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina State Key Laboratory of Smart Grid Protection and Control NARI Group CorporationNanjingChina Electric Power Research Institute of State Grid Shanghai Electric Power Company ShanghaiChina

The setting work of backup protection using steady-state current is tedious,and mismatches occasionally occur due to the increased proportion of distributed generations(DGs)connected to the power ***,there is a practical need to study a backup protection technology that does not require step-by-step setting and can be adaptively *** paper proposes an action sequence adaptive to fault positions that uses only positive sequence fault component(PSFC)*** the influence of DGs,the unified time dial setting can be obtained by selecting specific *** protection performance is improved by using the adjacent upstream and downstream protections to meet the coordination time interval in the case of metallic faults at the near-and far-ends of the ***,the expression and implementation scheme for inverse-time backup protection(ITBP)based on the unified characteristic equation is *** results show that this scheme can adapt to DG penetration scenarios and can realize the adaptive coordination of multi-level relays.

关键词： Inverse-time backup protection(ITBP) distributed generation(DG) positive sequence fault component(PSFC)voltage unified characteristic equation adaptive coordination

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Metallic Short Circuit Fault Location Algorithm Considering Capacitance Current based on Differential Equation

Metallic Short Circuit Fault Location Algorithm Considering ...

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2021 International Conference on Power System Technology, POWERCON 2021

作者： Liu, Huirong Zheng, Yuping Wu, Tonghua Hong, Feng Dai, Wei Li, Xindong NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781665407373

Capacitance current has significant effect on long-distance fault of high-voltage transmission line, and the current single-ended quantity location algorithm can hardly eliminate the effect of capacitance current under the power frequency. To reduce capacitance current's effect on location algorithm, this paper builds metallic grounding fault model based on RLC type circuit, takes fault location as the unknown variable, builds a mathematical location model within time domain applicable for taking account of capacitance current, and obtains the quadratic equation with one unknown for fault location. Then it substitutes the two independent variables for the linear term and quadratic term, solves independent variables through linear equation, and proves the solution exists and is unique. Then under analysis on the same difference error, it compares magnitude of error generated during calculation of the two independent variables, it corrects difference error first, and inversely solves fault location by selecting the numerically disturbed smaller independent variable. Simulation results indicate the algorithm can accurately take account of effect of capacitance current under different metallic fault conditions, and solve fault location in a stable and accurate manner. © 2021 IEEE.

关键词： Differential equations

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Scheduling Model for Inter-regional HVDC Tie-line Generation and Transmission System Considering Conditional Sections

Scheduling Model for Inter-regional HVDC Tie-line Generation...

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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Xu, Fan Cao, Rongzhang Tu, Mengfu Zhang, Yantao Yang, Leyong Zhang, Dandan State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (纸本)9781728143033

The HVDC transmission schedule for clean energy seldom considers the demand of receiving grid. With the expansion of clean energy scale, it brings great pressure to the receiving grid for safe and stable operation. For this reason, a generation and transmission scheduling model of inter-regional HVDC tie-line system considering conditional section is proposed. A step power adjustment model for the HVDC tie-line operation optimization is developed with consideration given to various constraints on tie-line power, which not only give full play to the characteristics of HVDC tie-line that can be flexibly adjusted, but also avoid the frequent conversion of HVDC converter equipment, making the HVDC tie-line schedule more executable. The joint operation model of cascaded hydropower plants in sending grid is established to meet the operational constraints such as the restricted operating zones of hydropower units, and to ensure the priority of clean hydropower resources and the practicability of the hydropower schedule. The model of conditional control section is established, which can effectively deal with the problem of the coupling between the power limits of section and the number of running units, so as to ensure the safe and stable operation of related sections. Based on the actual data of a cross-regional interconnected power grid, the validity of the model is verified, which can promote the accommodation of clean energy across a wide range of regions, reduce the supply cost of large power system, and alleviate the pressure of safe and stable operation at the receiving system. © 2020 IEEE.

关键词： HVDC power transmission

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A Method to Prevent and control the Interruption Exception of Sampling in Merging Unit

A Method to Prevent and Control the Interruption Exception o...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Cao, Rui He, Zhaohui Wu, Tonghua Zhou, Bin Wang, Zhonglang Li, Xindong State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (纸本)9781728191645

As the sampling interruption is the heartbeat of merging unit, its stability is directly related to the accuracy and discreteness of the output SV packets of merging unit. To prevent the output error from merging unit when its sampling interruption is abnormal, this paper proposes crystal frequency monitoring technology, sampling interruption monitoring technology and SV packets timing monitoring technology, forming the prevention and control system of sampling interruption exception of merging unit. The merging unit developed by above technology has the function of early warning and processing for the occasional sampling interruption exception, which improves the reliability of intelligent substation operation. © 2020 IEEE.

关键词： Merging

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Applicability analysis of tie-line bias control strategy in interconnected power grid with DSU 2

Applicability analysis of tie-line bias control strategy in ...

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2017 IEEE 2nd Information Technology, Networking, Electronic and Automation control Conference (ITNEC 2017)

作者： Zonghe Gao Xianliang Teng Yuanyuan Li Kaifeng Zhang Kun Yuan Wenjun Bi State Key Laboratory of Smart Grid Protection and Control (Nanjing NARI Group Corporation) Key Laboratory of Measurement and Control of Complex Systems of Engineering (Southeast University)

ISBN: (纸本)9781509064151;9781509064144

Directly scheduled unit, as a kind of excellent frequency regulation resource, plays an important role in the control of China's interconnected power grid. First of all, based on the regional control model, the theory of the "closed area" of the direct-dispatching generators is demonstrated, and the mechanism of suppressing the regional control error(ACE) by this method is revealed. Then, based on Virtual Partition(VP), the tie-line bias control(TBC) method for hierarchical control structure is designed. This method enables the power of each tie-line to reach the rated value. Finally, the correctness and feasibility of the proposed method are verified by the standard IEEE 10-unit 39-bus system.

关键词： tie-line bias control directly scheduled unit virtual partition multi-area interconnected system ACE

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