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Risk Analysis of Electric Vehicles Connected to the Cyber-physical Power System

Risk Analysis of Electric Vehicles Connected to the Cyber-ph...

引用

2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Li, Manli Ni, Ming Tong, Heqin Ru, Yingtao Xu, Jinjiang Wu, Yingjun Nari Group Corporation State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control School of Electrical of Engineering Southeast University Nanjing China Hohai University College of Energy and Electrical Engineering Nanjing China

ISBN: (纸本)9781665414395

The promotion and application of electric vehicles can effectively alleviate environmental pollution and fuel shortages. However, when a large-scale electric vehicle is connected to the power system, it brings the risk of cyber-attacks during the massive data communication process. If the cyber-attack in the data transmission process cannot be effectively detected for safety, the charging behavior will not be controlled correctly and effectively. The safe operation of cyber-physical power systems will take great risks. Therefore, the cybersecurity risks that may exist when electric vehicles are connected to the cyber-physical power system are analyzed in this article. Firstly, based on the communication structure of large-scale electric vehicles connected to the cyber-physical power system, the potential safety hazards in the information communication network of electric vehicles are analyzed. Exploring the possible cyber-attacks during the information interaction to discover the risks to the power grid caused by malicious cyber-attacks of electric vehicles. Thus, it provides the foundation for the study of power grid stability control methods and escorts the further development of the smart grid. © 2021 IEEE.

关键词： Embedded systems

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The operation analysis of the CCHP driven by Gas-steam combined cycle 2

The operation analysis of the CCHP driven by Gas-steam combi...

引用

2nd International Conference on Oil and Gas Engineering and Geological Sciences, OGEGS 2020

作者： Liang, Junyu Yuan, Xingyu Gu, Jiangqi Yunnan Electric Power Research Institute Csg China Nari Group Co. Ltd State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better;in summer operating conditions, the indicator of following the electric load (FEL) is better;during the transition season, the value of PEC is better in the case of following the thermal load. © Published under licence by IOP Publishing Ltd.

关键词： Thermal load

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A Method for Locating Ground Faults in Distribution Network Based on Change of Longitudinal Current

A Method for Locating Ground Faults in Distribution Network ...

引用

2021 International Conference on Control Science and Electric Power Systems, CSEPS 2021

作者： Lei, Xia Hai, Wu Guo, Hu Song, Hu State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China NARI Technology Development Co. Ltd. Jiangsu Nanjing211106 China

ISBN: (纸本)9781665426183

A new method for locating ground faults in distribution network was introduced by analysis of the characteristics of the ground fault for the isolated neutral system. The method by comparing the longitudinal current change of the adjacent measurement point to judge the ground fault location, and has verify it by building the simulation model on the PSCAD/EMTDC. The results show that the method has a strong ability of resistance to transition resistance. The specific implementation scheme was given based on the fault indicator which is widely used in distribution network at present. © 2021 IEEE.

关键词： Location

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Frequency Regulation Potential Evaluation of Temperature-Controlled Load Aggregators Considering Demand Response Willingness

Frequency Regulation Potential Evaluation of Temperature-Con...

引用

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

作者： Jie Yu Jiaqi Yang Qia Ding Mengfu Tu Weixi Ji Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing China

The frequency regulation potential of temperature-controlled load aggregators means that, the total load reduction that all the aggregated temperature-controlled load users can participate in the frequency regulation. User demand response willingness refers to the willingness of users to adjust electricity consumption according to the price of electricity sales to provide demand response based on their own demand response elasticity. This paper establishes a user demand response willingness model including two parts of electricity cost change and temperature change, which is used to characterize the relationship between user frequency regulation potential and electricity price; then proposes a time series chained two-dimensional cloud generator algorithm for the willingness model to predict the temperature-controlled load operating state in the temperature-controlled load, and finally establish a two-layer model to optimize the frequency regulation potential of the temperature-controlled load aggregator, with the frequency regulation potential as the solution variable. The effectiveness of the algorithm and the model are verified through calculation examples, and sensitivity analysis is carried out.

关键词： Electric potential Cloud computing Time series analysis System integration Predictive models Prediction algorithms Demand response

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Transient Stability Analysis of Paralleled grid-Forming Converters

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

引用

Energy, Power and Electrical Engineering (EPEE), International Conference on

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

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.

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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...

引用

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...

引用

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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Influence Analysis of Control Parameters on Transient Stability of Single-loop Voltage-Magnitude Controlled grid-Forming Converter

Influence Analysis of Control Parameters on Transient Stabil...

引用

Asia Conference on Energy and Environment Engineering (ACEEE)

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

With the gradual increase in the proportion of new energy generation, grid-forming control with dynamic regulation and support capability of frequency and voltage has become a research hotspot. However, the current-limiting control of the converter reduces the transient stability margin and leads to the complex evolution of the transient instability mode, which poses a great challenge to the stable operation of new energy units. In this paper, the influence of different current limiting strategies on the transient stability of the single-loop voltage-magnitude controlled grid-forming converter is analyzed, and three typical instability evolution modes are summarized. Further, the influence law of virtual inertia and damping parameters on the transient stability is analyzed by critical clearing angle (CCA), and critical clearing time (CCT), the mechanism of abnormal phenomena of virtual inertia and damping parameters on transient stability is revealed based on the equal area criterion, and the conditions for abnormal phenomena are clarified, finally, the transient instability evolution modes and the mechanism of abnormal phenomena is verified by electromagnetic transient time domain simulation.

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Developing Characteristics of Oil-immersed Transformer Internal Fault with Dignostic Method Using Convergence Patterns of Free Gas

Developing Characteristics of Oil-immersed Transformer Inter...

引用

Electrical Engineering (CIYCEE), IEEE China International Youth Conference on

作者： Yucheng Zhang Zhiguo Hao Yuping Zheng Shuyan Pan Boyu Li Zhongxin Xue Jinzhao Deng School of Electrical Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China

ISBN: (纸本)9781665400657

Light gas protection only operates when gas within the transformer collection chamber reaches threshold volume. Such criterion failed to reflect transformer conditions accurately due to the lack of understanding for defect developing process and corresponding gas generation- convergence pattern, which has led to lower protection reliability and has caused several transformer explosions. To address current problem, an experimental tank with structure resembling that of a power transformer is set up, inside which the needle-plate oil-pressboard breakdown model is planted. Experimental results indicate that throughout fault development, voltage drops became more frequent until arcing occurs, so is HFCT signal; meanwhile gas generation rate increases through slight partial discharge, spark discharge and arcing stage, the collected gas volume corresponds with patterns above. The purpose of this study is to clarify the defect developing process and the gas generation-convergence pattern for oil-immersed transformer internal fault in guidance for a more reliable protection method.

关键词： Surface discharges Windings Oil insulation Discharges (electric) Reliability Sparks Plastics

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A Top-k QoS-Optimal Service Composition Approach Under Dynamic Environment 7th

A Top-k QoS-Optimal Service Composition Approach Under Dynam...

引用

7th International Conference on Artificial Intelligence and Security, ICAIS 2021

作者： Tian, Cheng Zhang, Zhao Yang, Sha Huang, Shuxin Sun, Han Wang, Jing Zhang, Baili School of Computer Science and Engineering Southeast University Nanjing211189 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nari Group Corporation Nanjing211106 China

ISBN: (纸本)9783030786083

To deal with low efficiency of existing Web service composition algorithms under dynamic environment, this paper proposes a Top-k QoS-optimal service composition algorithm based on QWSC-K static algorithm. The algorithm first considers the influence of dynamic environment on the existing service composition and service dependency graph, and classifies the changed services in dynamic environment. Moreover, different strategies are adopted to obtain the intermediate results of service composition for different categories of services. The influence of different service categories on the service dependency graph is analyzed to realize the updating of the service dependency graph. Finally, based on the updated service dependency graph and the intermediate results of the service composition, the adaptive incremental update can be applied to change the original service composition results, avoiding the time-consuming re-query process. Experiments show that the algorithm is efficient and accurate in dynamic environment. © 2021, Springer Nature Switzerland AG.

关键词： Quality of service

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