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

共 544 条记录，以下是371-380 订阅

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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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Energy Storage Planning and Economic Dispatch of Microgrid Considering Power to Gas 12

Energy Storage Planning and Economic Dispatch of Microgrid C...

引用

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

作者： Gu, Jiaqi Mei, Fei Lu, Jixiang Lu, Jinjun Yang, Bo Hohai University College of Energy and Electrical Enginering Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China China Electric Power Research Institute Nanjing China

ISBN: (纸本)9781728157481

New energy has been vigorously promoted for its advantages such as cleanliness, large reserves and renewability. Recently, power-to-gas (P2G) technology has provided a new idea for energy conversion, which helps to improve energy efficiency. In view of the current high penetration rate of photovoltaics, the impact of three measures with regard to energy conversion, energy storage configuration and demandside response on the economics of the microgrid and the optimal scheduling of the microgrid are explored. Firstly, a microgrid scheduling model with P2G device is built;Secondly, a bi-level planning model for the economic cost of the microgrid scheduling is presented. The upper layer will be based on absolutely accommodation of photovoltaics as the prerequisite to conFigure the optimal energy storage capacity;Then lower layer performs optimized scheduling under the upper model to ensure the economy of the microgrid. Finally, a comparison example is used to analyze the optimal energy storage capacity in different scenarios and an optimized scheduling scheme is given. © 2020 IEEE.

关键词： Scheduling

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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

IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

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

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

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.

关键词： Hydroelectric power generation HVDC transmission Schedules smart grids Dispatching Vibrations

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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

Sustainable Power and Energy Conference (iSPEC)

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

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

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.

关键词： Substations Heart beat Merging Crystals Reliability engineering Synchronization Monitoring

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Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory

Non-intrusive monitoring and disaggregation of industrial lo...

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第三届材料科学应用与能源材料国际研讨会

作者： Wei Zheng Jie Yu Hongjie Tian Peng Li Chenning Wu Mengfu Tu School of electrical engineering Southeast University State Key Laboratory of Smart Grid Protection and Control

In this paper, the non-intrusive monitoring and disaggregation method of industrial load based on Petri net theory is studied. First, the basic concepts of Petri nets are introduced. On the basis of prototype Petri nets, time factor is added. Then, the Petri net with time factor is combined with industrial load production process. Considering the production sequence, start-stop time and production time constraints of industrial load, a non-intrusive monitoring and disaggregation model of industrial load is constructed. Finally, according to the actual production process of industrial load, the electricity consumption situation of each production link is calculated, and the detailed analysis results of industrial user's electricity consumption behavior are obtained. The research could provide an important reference for realization of friendly interaction between industrial users and power grid.

关键词： Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory Petri net

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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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Calculation of the Maximum Hosting Capacity of Distributed Photovoltaics in Distribution Networks Considering Flexible Interconnections

Calculation of the Maximum Hosting Capacity of Distributed P...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Tong Sun Yi Song Kai Yuan Ruosong Hou Jiakun An Wenguang Jin Shenxi Zhang Haozhong Cheng College of Smart Energy Shanghai Jiao Tong University Shanghai China State Grid Economic and Technological Research Institute Co. Ltd. Beijing China Economic and Technological Research Institute of State Grid Hebei Electric Power Co. Ltd Hebei China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China

Large-scale access to distributed photovoltaics leads to power imbalance and frequent voltage fluctuations in distribution station areas, increasing the difficulty of operation control of distribution networks. To solve these challenges while improving the utilization rate of distributed photovoltaics, this study proposes a method for calculating the maximum hosting capacity (HC) of distributed photovoltaics in distribution networks, considering the flexible interconnection of low-voltage distribution station areas. First, two types of networking modes of the flexible interconnection of distribution station areas are analyzed and mathematical models are developed for them. Then, an optimization model of the maximum HC of distributed photovoltaics in a distribution network that considers the flexible interconnection of distribution station areas is established, and the increasingly tight linear-cut algorithm is used to solve it, which aims to narrow the gap introduced by the convex relaxation to get the optimal solution. Finally, the accuracy of the model and algorithm is checked in the modified IEEE 33-node distribution network.

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

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

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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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