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

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Analysis of Single-phase Grounding Fault in Low-resistance Grounding System Containing Inverter Interfaced Distributed Generator 6

Analysis of Single-phase Grounding Fault in Low-resistance G...

引用

6th International Conference on Power and Renewable Energy, ICPRE 2021

作者： Wu, Tonghua Qiao, Yida Zha, Daojun Zheng, Yuping Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China Hefei University of Technology Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei China

ISBN: (纸本)9781665449618

In the low-resistance grounding system with inverter interfaced distributed generator (IIDG), the IIDG widely uses the neutral point through the low-resistance grounding method. But the IIDG, which adopts the neutral point grounding through a low resistance, will affect the fault characteristics of the original low-resistance grounding system. This paper uses the symmetrical component method to establish a single-phase grounding fault model for the distribution network where the neutral points of the IIDG and the main network are grounded with low resistance. The fault current, the zero-sequence current, and the three-phase current of the line are analyzed when the upstream line of the grid connection point, the downstream line of the grid connection point, and the adjacent feeder fail. Finally, a simulation model was built using Matlab/Simulink to verify the correctness of the analysis. The conclusion provides a basis for the protection configuration of the distribution network in which the neutral points of the IIDG and the main network are grounded with low resistance. © 2021 IEEE.

关键词： Electric grounding

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Overview of DC transmission line fault analytical methods and single-ended protection 4

Overview of DC transmission line fault analytical methods an...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Pu, Hongfei Li, Xindong Wu, Tonghua Yao, Gang Nari Group Corporation State Grid Electric Power Research Institute Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728171494

DC transmission technology, which plays an important role in connecting AC grids, can transmit power asynchronously under long-distance and large-capacity conditions. protection devices and control system of the DC transmission system are quickly put into use after the information of the first traveling wave caused by faults of DC lines having been detected. Therefore, the current HVDC transmission line mainly adopts single-ended protection based on first traveling wave information as main protection for DC lines and such protection is not affected by the control strategy. But in the fault transient stage, changes of electrical quantities of DC transmission lines will show nonlinear characteristics because of the control strategy. At present, the analytical method of fault characteristics in the transient stage is not perfect and the rapid coordination of control and protection has not been realized. This paper presents an overall introduction to the research statuses of fault analytical methods and single-ended protection principles of DC transmission lines. First, the fault characteristics of LCC- based DC transmission lines and VSC-based DC transmission lines are compared. Second, the current research statuses of HVDC transmission line analytical models and fault transient analytical methods are analyzed and the shortcomings of current analytical methods are listed. Third, the current single-ended protection principles of DC transmission lines are classified, and then the problems and valuable research directions in the process of studying single-ended protection principles based on the coordination of control and protection are listed. Finally, the outlook for the rapid coordination of control and protection of DC transmission lines is determined. © 2021 IEEE.

关键词： HVDC power transmission

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Research and Application of Simplified Service Bus in New Generation Dispatching Technical Support System and Heterogeneous System 6

Research and Application of Simplified Service Bus in New Ge...

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

作者： Qiang, Yi Shupeng, Wan Zhemin, Wang Weihua, He Ping, Zhang Feng, Zhang NARI Technology Co. Ltd System R&D Center Nanjing China State Grid Shanxi Electric Power Co. Ltd Taiyuan China State Key Laboratory of Smart Grid Protection and Control System R&D Center Nanjing China

ISBN: (纸本)9798350347159

With the rapid development of UHV AC / DC hybrid power grid, in order to cope with the large-scale access of new energy, the power market reform has been continuously promoted. Therefore, it is proposed to build a new generation of dispatching technical support system to meet the needs of future power system development and safe, stable and high-quality operation. This paper proposes a simplified service bus that supports a new generation of service-oriented architecture, and meets the deployment characteristics of cloud terminals that are cross platform, lightweight, easy to deploy, open and efficient. The simplified service bus can well meet the location independent characteristics and be easily deployed in and out of the system. The flexible protocol processing mode cooperating with the gateway can meet the needs of accessing the services of the system and external systems. At the same time, it supports multiple man-machine network and automatic switching of service network shutdown under N-1 mode, which greatly improves the availability and stability of the system, Which Provide a strong guarantee for the safe, stable and efficient operation of the new generation system. © 2022 IEEE.

关键词： Gateways (computer networks)

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Distribution Network Differential protection Method Based on Dynamic Time Warping Algorithm 1

引用

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

作者： Long, Wei Pan, Shuyan Wu, Hai School of Electrical and Automation Engineering Nanjing Normal University Jiangsu Nanjing210023 China NARI Technology Co. Ltd Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

As a new technology, 5G technology has lower cost than optical fiber and comparable transmission speed and carrying capacity, which can improve the performance of distribution network communication system. At the same time, differential protection based on two terminal data cooperation has a new life. However, 5G signal has delay jitter, and the transmission delay of channel may change, which increases the difficulty of synchronization and affects the reliability of differential protection. Therefore, this paper proposes an improved protection method based on dynamic time bending distance, introduces floating threshold as braking value, improves the reliability of protection, and has good adaptability to delay jitter and asynchronous error, which has certain engineering significance. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Optical fibers

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Digital Management and Application Platform for Security and Stability control Devices

Digital Management and Application Platform for Security and...

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Power and Energy (PandaFPE), Panda Forum on

作者： Fengjie Shen Jianbing Xu Yuqiang Hou Kang Zhao State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Grid Shandong Electric Power Research Institute Jinan China

The management of massive security and stability control devices (SSCD) configured for power grids is relatively decentralized, and there is an urgent need for refinement and intensification. Focusing on the purpose of improving the reliability level of SSCD, and referring to the power grid digitization work plan, this paper constructs a digital management and application platform for SSCDs based on “running on the cloud platform+localization”. First, it introduces the platform positioning and overall framework, and then elaborates the business functions such as device management, version management, test management, evaluation and decision-making. This achieves digital management and reliability test evaluation of mass SSCDs, also improves the reliability level of SSCDs. Finally, illustrates the actual application effect of this platform in a laboratory.

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Distributionally Robust Chance-Constrained Optimization Dispatch Method for New Power Systems with Virtual Energy Storage

Distributionally Robust Chance-Constrained Optimization Disp...

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Power System and Green Energy Conference (PSGEC)

作者： Xiaowei Ma Xiaoning Kang Min Gao Jiaqi Song Jinjun Lu Yuhao Gu School of Electrical Engineering Xi’an Jiaotong University Xi’an China Northwest Branch of State Grid Corporation of China Xi’an China NARI Group Co. Ltd. (State Key Laboratory of Smart Grid Protection and Control) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Addressing the issue of renewable energy integration caused by large-scale wind power grid connection, a novel electric power system distributed robust joint chance-constrained (DRJCC) optimization dispatch model incorporating captive power plants with virtual energy storage (VES), wind, thermal, and hydropower units is proposed. Initially, considering that high-energy-consuming enterprises' self-provided power plants (SPPPs) can accept the unified dispatch of the public grid, three operational modes for the SPPPs as VES participating in the main grid interaction and their call costs are presented, and a two-stage stochastic optimization model for the new power system including VES is constructed. Subsequently, a data-driven DRJCC approach is utilized to address the uncertainty in wind output, constructing a fuzzy set of probability distributions for uncertain variables based on the Wasserstein distance, and expanding the original stochastic optimization model to a W-DRJCC optimization model. Further, by applying strong duality theory, Bonferroni inequality, and Conditional Value-at-Risk (CVaR) approximation, the proposed distributed robust model is transformed into a mixed-integer linear programming problem for solution. Finally, case analyses on an improved RTS-24 power system demonstrate that the proposed method can balance economic efficiency and robustness, offering significant insights for the construction of operational modes for enterprises' SPPPs to participate in grid interaction.

关键词： Fuzzy sets Costs Optimization models Electricity Stochastic processes Hydroelectric power generation Robustness Power systems Optimization Energy storage

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Performance Analysis of Robust Tightly Coupled GNSS/INS Integration Positioning Based on M Estimation in Challenging Environments

Performance Analysis of Robust Tightly Coupled GNSS/INS Inte...

引用

第十三届中国卫星导航年会

作者： Yingying Jiang Shuguo Pan Qian Meng Min Zhang Wang Gao Chun Ma School of Instrument Science and Engineering Southeast University State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation

The phenomena of limited satellite visibility and multipath is serious in challenging environments,which causes to decrease of the positioning accuracy *** effective solution is tightly coupled integration of Global Navigation Satellite Systems(GNSS) and Inertial Navigation System(INS) based on robust M ***,the robust performance is directly influenced by both the selection of equivalent weight functions and the INS accuracy *** this paper,theoretical analysis and experiment validation of positioning accuracy and reliability for the robust integration system are implemented under the condition of various equivalent weight functions and different INS ***,for constructing equivalent least square form of EKF,we combine classical EKF observation equation with redundant observation equation established by predicted state and corresponding covariance in propagation ***,robust extended Kalman filter(REKF) algorithm which is based on M estimation is introduced for purpose of weakening the influence of faults on ***,the features of three typical equivalent weight functions(Huber,Tukey,IGG-Ⅲ) are analyzed ***,a simulation experiment platform is built to analyze the influence of the choice of equivalent weight functions and the IMU grades on positioning accuracy and reliability,which is realized by integrating GNSS and various grades IMU to locate with three REKF solutions against traditional *** experimental results show significant enhancements for REKF based on M estimation in terms of precision and reliability of tightly coupled ***,in the setting failure scenario,the solution scheme based on IGG-Ⅲ equivalent weight function can obtain the optimal robust effect in comparison with REKF(Huber) and REKF(Tukey),whose horizontal positioning accuracy is kept within-0.5 m ～ 0.5 m and vertical positioning accuracy is no more than 1 ***,compared with consumer grad

关键词： Extended Kalman Filter Equivalent Least Square M Estimation Equivalent Weight Function INS

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Research on Coordination Strategy of Emergency and Correction control under High Proportion of New Energy Connected to Power Grid

Research on Coordination Strategy of Emergency and Correctio...

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

作者： Fusuo Liu Hui Huang Haijun Chang Xuelian Wu Chao Wang State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation/State Grid Electric Power Research Institute Nanjin China

With the large-scale access of new energy sources, the operation mode and the uncertainty factors of the power grid increase, meanwhile the short-term power shock has an increasing impact, which exacerbates the complexity of the system frequency response characteristics and the difference in space-time distribution. Based on the analysis of principles and adaptability of emergency control and correction control, this paper comprehensively considers the operation mode and new energy access, and proposes a centralized control decision-making method based on model and trajectory driving from the perspective of global frequency control. The method also considers the continuously adjustable control resources and low voltage ride through of new energy. Finally, the practicality of the proposed method is verified based on the actual power grid simulation.

关键词： Low voltage Analytical models Adaptation models Uncertainty Decision making Power grids Trajectory

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Stability control System for Power Grid Security Defense Level Improvement

Stability Control System for Power Grid Security Defense Lev...

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smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Jingjing Ruan Peng Chen Junnan Chen Xiaotong Xu Jian Zhang State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

The rapid development of UHVDC, new energy and power market enhances significantly the uncertainty of power grid. The control strategy of stability control system calculated offline cannot cover the complex and changeable power grid operation situation. A hierarchical closed-loop stability control system is proposed to meet the stability control requirements under multiple and cascading faults, including dispatching center station, coordination control master station and regional control master station The dispatching center integrates natural disaster information to generate high-risk faults and searches online control strategy based on controllable resources acquired by coordination control master station. Coordination control master station stores control strategy of high-risk faults, identify high-risk faults in different places, and issue the control strategy. Regional control master station is responsible for the implementation of high-risk faults control strategy. The analysis results demonstrate that the system can improve the security defense level of power grid. The proposed method is proved to be fast and effective through the analysis of a practical power grid example.

关键词： Uncertainty Power system stability control systems Search problems Power grids Stability analysis Dispatching

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Distributed transmission technology of node status in distribution network 2

Distributed transmission technology of node status in distri...

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2021 2nd International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2021

作者： Tan, Kuo Wu, Hai Hu, Guo Chen, Hui NARI Technology Co. Ltd. Nanjing211000 China Nanjing211000 China State Key Laboratory of Smart Grid Protection and Control Nanjing211000 China

With the rapid development of distribution network automation and the construction of DC distribution network and AC / DC hybrid distribution network, the network operation mode is more flexible. If the distribution network wants to realize rapid load transfer, such as the connection of power supply, upstream and downstream fault isolation signals and other node states need to be quickly identified. At present, the node status identification of distribution automation is basically completed by the master station. However, the master station has poor real-time transmission of status information, which is generally in seconds or minutes, and can not meet the demand of real-time load transfer. In this paper, a distributed real-time transmission method of AC and DC distribution network node status is constructed for distribution automation system. Based on IEC61850 goose communication protocol, the real-time transmission of node status is realized in distribution automation terminal. In this method, the positive direction of each tie switch is defined, which is independent of power flow direction, and the tie switch is distinguished along the user-defined positive direction When multiple tie switches have the same upstream node, they are each other's t nodes. Each tie switch needs to be equipped with a distribution automation terminal with goose communication capability. According to different control strategies, the distribution automation terminal can realize millisecond level node state transmission step by step. Node state can be divided into unconditional transmission state and conditional transmission state. The distributed real-time transmission technology of distribution network node state proposed in this paper has been successfully applied to Tongli integrated energy service The center and Suzhou medium and low voltage DC project lay the foundation for the realization of loop closing, loop breaking control, fast fault isolation and power transfer control strat

关键词： Energy transfer

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