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

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Fast Fault protection Design and control of DC Trnasformer

Fast Fault Protection Design and Control of DC Trnasformer

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Guoning Wang Zhigang Wang Xiaoming Zeng Yongwei Wang Weimei Ge State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Reasearch Insitute) Nanjing China State Grid Xinyuan Company Shandong TaIshan Pumped Storage Power Station Co. LTD Tai’an China

ISBN: (纸本)9781665414401

With the diversification of loads and the development of distributed energy, DC system and DC transformer attracted more and more attention in modern power system. However, bipolar short-circuit faults threatened the safety of DC power system operation due to the surge current caused by them. When DC transformer low voltage output has short circuit fault, it must block fault current quickly. This paper proposed a fault protection control method in DC transformer. Through the design and control, the fault current can be quickly blocked, and the fault current output can be maintained to support the rapid recovery of the system. After adding the fault protection circuit and control in DC transformer, the protection performance is greatly improved. Finally, the real-time simulation of RTDS verifies that the proposed short-circuit protection current-limiting control can well achieve the design goals.

关键词： Low voltage Conferences Fault protection Surge protection Transformers Real-time systems Safety

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Design of real-time message synchronization cross smart grid dispatching system 4

Design of real-time message synchronization cross smart grid...

引用

4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Xu, Chunlei Liu, Tong Lei, Baolong Peng, Hui State Grid Jiangsu Electric Power Co. Ltd. Nanjing China NARI Technology Co. Ltd. Xi'an China NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728196060

In the integrated operation mode of the smart grid dispatching and control system, there is a large amount of real-time data such as important alarms and manual operations that need to be shared between systems. How to synchronize these real-time data across systems with high reliability and performance becomes a problem to be solved. This paper studies the application scenarios of cross-system message synchronization and proposes a scheme based on redundant dual networks, including hardware and software architecture. The key technologies and important functions were implemented, reliability and throughput verifications were performed, and the expected results were achieved. © 2020 IEEE.

关键词： smart power grids

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Research on Service-Oriented Substation Wide-Area Operation and Maintenance System and Its Application

Research on Service-Oriented Substation Wide-Area Operation ...

引用

2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Liang, Feng Liang, Xudong Yang, Shanglin Pan, Hongxiang NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control R&D Department in NARI Technology Nanjing211106 China NARI Group Corporation RandD Department in NARI Technology Nanjing211106 China

ISBN: (纸本)9781728191645

The substation has the features of a large quantity and wide-area distribution. With the promotion of unattended mode, it has become increasingly difficult to adapt to the needs of smart grid development using traditional field-based automatic equipment operation and maintenance(OM) method. Meanwhile, there is a shortage of professional and technical personnel, and the OM technology of a large number of intelligent heterogeneous secondary equipment is complicated and challenging to maintain. Therefore, it is urgent to solve the problems of OM efficiency, timeliness and technical complexity of a large number of substations. Based on the service-oriented idea, this article has designed the overall structure of the trinity of service management center, OM center and OM substation. This paper also proposes a GSP-based service standardization interaction mechanism. Through Safety management and control process of OM service, OM advanced applications are designed to achieves the automation equipment specification, safe and reliable remote operation and maintenance. © 2020 IEEE.

关键词： Maintenance

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Best practices in China Southern Power grid competition of AI short-term load forecasting 12

Best practices in China Southern Power Grid competition of A...

引用

12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020

作者： Lu, Jixiang Qian, Junxia Zhang, Qipei Liu, Shaobo Xie, Feng Xu, Hongsheng State Key Laboratory of Smart Power Grid Protection and Control Nanjing China Jiangsu Keneng Electric Power Engineering Consultant Co. Ltd Nanjing China Technology Research Center Nari Group Corporation Nanjing China

ISBN: (纸本)9781728157481

China Southern Power grid (CSG) hosted a competition of AI short-term load forecasting with real-world load data in Sept 2019. NARI Technology was invited for the 10 days closed match and got the 2nd prize among 28 top players in China, such as research institutes, universities, and system suppliers. This paper highlights the best practices we did in the competition: feature selection of short-term load forecasting, outlier data preprocessing for both load data and meteorological data, multiple head long short term memory (LSTM) neural network innovation and data augmentation with the benchmark. opportunities for improvements are considered as well. © 2020 IEEE.

关键词： Long short-term memory

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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

Sustainable Power and Energy Conference (iSPEC)

作者： Manli Li Ming Ni Heqin Tong Yingtao Ru Jinjiang Xu Yingjun Wu 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 College of Energy and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9781665414401

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.

关键词： Power measurement Pollution Process control Power system stability Electric vehicles Stability analysis smart grids

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Study on the Corresponding Relationship Between Critical Points of P-V Curve and V-Q Curve of Simple Thevenin Equivalent System

Study on the Corresponding Relationship Between Critical Poi...

引用

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

作者： Xuan Li Zhaowei Li Linlin Guan Xuelian Wu Yan Mei Jun Li State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function.

关键词： Electrical engineering Reactive power Power demand Conferences Power system stability Faces

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A Fast Blocking Method of Bus protection when CT Disconnected Based on Braking Current and Zero Sequence Current

A Fast Blocking Method of Bus Protection when CT Disconnecte...

引用

2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Wang, Yincheng Zhu, Jie Dai, Wei Zhu, Xiang Wang, Xiaohong Zhang, Kaiyu NARI Technology Co. Ltd NARI Group Corporation Nanjing China Maintenance Company of State Grid Tibet Electric Power Co. Ltd State Grid Tibet Electric Power Company Lhasa China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781728191645

Current transformer (CT) disconnection of bus is prone to maloperation of bus differential protection. The existing criteria for CT disconnection do not fully consider the distinction between heavy load high impedance fault and external metal fault transfer to internal high impedance fault. And not fully consider the influence of one-half wiring circulation and unbalanced impedance on CT disconnection zero sequence criterion. Based on the theoretical analysis of the characteristics of braking current variation and zero sequence current distribution in the event of internal fault, this paper puts forward a fast blocking criterion of CT disconnection based on braking current and zero sequence current, and carries out simulation verification. Both the theory and the simulation show that there is a drop of braking current in the event of internal fault. The distribution of zero sequence current in the event of CT disconnection is obviously different from that in the event of internal fault. The criterion proposed in this paper can effectively and reliably distinguish CT disconnection from internal fault. © 2020 IEEE.

关键词： Transformer protection

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Day-ahead optimal scheduling of integrated energy system with electric heat pump 3

Day-ahead optimal scheduling of integrated energy system wit...

引用

2019 3rd International Conference on Power and Energy Engineering, ICPEE 2019

作者： Zhang, Nianchu Wang, Qi Ni, Ming Li, Manli Zhang, Zheng Nanjing Normal University College of Electrical and Automation Engineering Nanjing China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

The regional integrated energy system is an effective way to realize energy cascade utilization and improve the flexibility and economy of the load side operation. Combine cooling heating and power (CCHP) system is a typical form of integrated energy systems. However, due to heat-load-based operation mode, the peak modulation capacity of CCHP units and the accommodation of renewable energy are limited. This paper explores methods of increasing the flexibility and economy of the system. An optimal scheduling model is proposed for integrated energy systems containing an electric heat pump, considering heating network characteristics. Simulation results show that the electric heat pump can help the system realize heat-and-power decoupling, improve the flexibility of the system and reduce the operating cost of the system. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Pumps

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Research on Screening Method of Operating Risk Points for Power System Pre-Dispatch

Research on Screening Method of Operating Risk Points for Po...

引用

Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Yi Wang Ji Zhang Qingcheng Liu Ling Xu Xin Wu NARI Group Corporation (State Grid Electric Power Research Institude) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China East China Branch of State Grid Corporation of China Shanghai China

As a concept proposed by the new generation dispatching and control system, pre-dispatch is a control method for accurately adapting to situation changes and operational risks of power grid operation in the future. Regarding the problem of power system security assessment under pre-dispatch, this paper proposes a multi-snapshot grid operating risk points screening method. Three models based on optimal power flow are employed for power flow analysis after the power grid operating status changes, then the power grid operation trend data is obtained. And after initial risk screening, possible operating risk points are obtained to form a risk data set. The proposed model is tested in the IEEE39-node system. The risk data sets screened by the three models are identical, which confirms the validity of the proposed model. The proposed method for screening operating risk points can provide dispatchers with a wide range of online auxiliary decision support.

关键词： Electrical engineering Power system protection Market research Power grids Data models Dispatching Safety

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Questionnaire Survey System for Residential Customers based on Developed Consumption Behavior Model

Questionnaire Survey System for Residential Customers based ...

引用

Chinese Automation Congress (CAC)

作者： Jianmin Zhang Dongming Liu Yusheng Xue Huanlei Yu Zhenyuan Xiao Ping Luo School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

The big obstacles for residential energy transition are from lacks of consumption behavior model and relative information system. A four-tier residential energy demand model is developed to explore the cognition-consciousness-demand-behavior evolution process; then residential energy behavior analysis data sources are investigated and necessity of questionnaire survey system is analyzed. To have a theory-supported information system, extension of Engel-Kollat-Blackwell consumption behavior model has been developed, and design of questionnaire survey system for residential customer is introduced with simple analysis of real implementation.

关键词： Green products Information systems Home appliances Energy consumption Biological system modeling Automation Cognition

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