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

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Remote closed-loop test method of safety and stability control system based on step-by-step implementation 2

Remote closed-loop test method of safety and stability contr...

引用

2nd International Conference on Digital Society and Intelligent Systems, DSInS 2022

作者： Zhao, Wei Hou, Yuqiang Chen, Xiong Xue, Feng Chen, Wei Chen, Luofei Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China PONOVO Power Co. Ltd. Beijing100000 China

ISBN: (纸本)9781510663244

The safe operation of the safety stability control system is an important means to ensure the safe and stable operation of AC and DC power grids. Aiming at the shortage of existing test methods that cannot perform closed-loop testing of field safety stability control systems, a remote closed-loop test method for safety stability control systems based on step-by-step implementation is proposed. Using the simulation results of real-time digital simulation system (RTDS) as the signal source, a remote test platform architecture integrating laboratory and field safety and stability control devices is designed, key modules such as platform management system, test master and test terminal are developed, specific solutions are given for platform communication, and a remote closed-loop test procedure is formulated. Finally, a pilot application is carried out with an actual power grid security and stability control system as an example, and the effectiveness of the proposed method is verified. © 2023 SPIE.

关键词： Real time systems

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Research Overview of the protection and Location Technologies for a Flexible DC Distribution Network 5th

Research Overview of the Protection and Location Technologie...

引用

International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Hu, Zilong Wu, Tonghua Li, Xindong Hong, Feng Zheng, Xiaojiang Zheng, Kuncheng State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nanjing211106 China College of Energy and Electrical Engineering Hohai University Nanjing210098 China

ISBN: (纸本)9789811597459

Due to the advantages of flexible control, good power quality, and convenient connection to distributed energy, flexible DC distribution networks have become a hot research topic around the world. However, the protection and location technologies for DC distribution networks are one of the main technical difficulties that confine their large-scale application, so it is necessary to overcome these difficulties as a matter of urgency. This paper presents an overall introduction to the research statuses of the fault features, protection principles, and fault location technologies of a DC distribution network. First, the fault features of a flexible DC distribution network are analyzed based on two-level VSC converter and modular multilevel converter. Second, the protection principles and fault location technologies of a DC distribution network as well as the main principles, advantages, and disadvantages of different technologies are analyzed. Third, the outlook for the development of protection and location technologies for a DC distribution network is determined. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Location

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Study on Propagation Process and Signal Acquisition of Traveling Wave for HVDC Transmission Line 1

引用

International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Chen, Yulin Zhao, Yucan Xian, Guangquan Zhang, Jianfeng Zhang, Jie State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China Nanjing NR Electric Co. Ltd. Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

Traveling wave fault location is very important for high voltage direct current (HVDC) transmission lines. The attenuation and distortion of traveling wave in HVDC transmission lines and secondary circuits will have non-ignorable negative impact on traveling wave fault location. In this paper, the attenuation and dispersion characteristics of traveling wave at different fault distance are simulated and analyzed. The further attenuation and distortion of traveling wave in the secondary circuit are studied by physical model. The problems of traveling wave reflection caused by the secondary cable and signal interference caused by strong electromagnetic interference are analyzed. Through the analysis of the whole process of traveling wave propagation and acquisition, the necessity of on-site acquisition of traveling wave signal for HVDC transmission line is proved. In this paper, the system scheme and key technology of on-site acquisition of traveling wave signal for HVDC line are given, and the technical feasibility of this scheme is stated. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Electric lines

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Analysis of influence of virtual inertia of grid-forming converter on transient stability characteristics 5

Analysis of influence of virtual inertia of grid-forming con...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Huang, Xifang Zhu, Ling Li, Wei Li, Mingfei Quan, Xiangiun Wu, Zaijun Research Institute NARI/SGEPRI State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation/State Grid Electric Power Nanjing China Southeast University Seu School of Electrical Engineering Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Due to its different characteristics from traditional synchronous generator, grid-forming converter (GFM-converter) affects the transient characteristics of the system when it is linked to the power grid. The mathematical model of the GFM-converter is built to describe its dynamic characteristics. Then, the transient process of the GFM-converter is analyzed qualitatively with the power-angle curve. The phase diagram method is used to study quantitatively and verify the validity of the above qualitative analysis. Finally, the influence of virtual inertia JGFM on the transient response is analyzed. In the case that equilibrium point exists after fault, decreasing virtual inertia improves the transient stability of the GFM-converter by increasing the damping ratio. When the equilibrium point does not exist after fault, the increase of JGFM reduces the virtual power angle at the time of fault clearing, and the power imbalance degree of the GFM-converter is reduced, thus its transient stability performance is improved. © 2022 IEEE.

关键词： Phase diagrams

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Fast Fault protection Design and control of DC Trnasformer

Fast Fault Protection Design and Control of DC Trnasformer

引用

2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Wang, Guoning Wang, Zhigang Zeng, Xiaoming Wang, Yongwei Ge, Weimei 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)9781665414395

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. © 2021 IEEE.

关键词： DC transformers

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Analysis on the Influence of the DC bias on spatial magnetic flux leakage in the transformer

Analysis on the Influence of the DC bias on spatial magnetic...

引用

2022 IEEE International Conference on High Voltage Engineering and Applications, ICHVE 2022

作者： Zheng, Yuping Pan, Shuyan Xia, Yu Ouyang, Xi Shang, Hujun Zhou, Quan Nari Group Corporation Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China School of Electrical Engineering Chongqing University Chongqing China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Magnetic flux leakage, as a basic physical parameter in power transformer, can be utilized to characterize the status of the winding. And the DC biasing, as a common abnormal operation condition, is caused by solar storms, DC power transmission and some railway power transmission. It can induce the current bias and the core saturation, further changing the distribution of the magnetic flux leakage. Therefore, it is significant and valuable to analyze the effect of DC biasing on spatial magnetic leakage flux. In the paper, we design a transformer finite element model with its physical fieldcircuit simulation module. The model with some detailed winding structure can obtain the accurate magnetic field signal. Then the effect of different degrees DC biasing on the magnetic leakage flux is analyzed in the inner key positions. And the 10kV shrunken experimental transformer imitating the 110 k V transformer is selected as the research object. Depending on the experimental platform, we obtain the actual magnetic field signals and explore the incidence relation between the magnetic leakage flux and the DC biasing. © 2022 IEEE.

关键词： Power transmission

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Research on the differential protection of the SFC output transformer for pumped storage hydro unit

Research on the differential protection of the SFC output tr...

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2021 International Conference on Information Technology and Intelligent control, CITIC 2021

作者： Long, Feng Wan, Luofei Pan, Shuyan Liu, Xiaobao Wang, Zhonglang Zhao, Ruichen State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China NARI Technology Co. Ltd. Jiangsu Nanjing211106 China

Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Energy utilization

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Typical Influence of Wind Power Capacity Expansion on the Transient Angle Stability and Feasible Explanations

Typical Influence of Wind Power Capacity Expansion on the Tr...

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Tiangang Huang State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The high proportion of renewable energy into the power grid, say, the large-scale wind power generation connected to the power grid, is the key approach to achieve the clean and low-carbon energy transition. Under the premise of ensuring power grid's safe and stable operation, it is necessary to study the influence of wind power capacity expansion on the transient angle stability (TAS). Aiming at several typical dominant modes in Qinghai power system, which holds many new energy resources, the sensitivity of wind power capacity expansion in different locations to the TAS, as well as its key influence factors and feasible explanations, are explored. It may lay the foundation of the location optimization of wind power capacity expansion.

关键词： Stability criteria Wind power generation Power system stability Power grids Transient analysis Thermal stability Optimization

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Study on 24h Dynamic Reactive Power Optimization Considering Safety operation Limit of Generators

Study on 24h Dynamic Reactive Power Optimization Considering...

引用

2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Lu, Bin Xu, Xi Yu, Zhipeng Wang, Wen Gu, Xuenan NARI Group Corporation State Grid Electric Power Research Institute China NARI Technology Co. Ltd. China State Key Laboratory of Smart Grid Protection and Control China Southeast University Nanjing China

ISBN: (纸本)9781728135205

In order to solve the practical problem of 24-hours dynamic reactive power optimization in power system dispatching, according to the limit output range of generator's operation, this paper divides generator's operation into three regions in PQ mathematical model and takes the action times of discrete control equipment as global inequality constraints, finally establishes a complete 24-hours non-linear mixed integer dynamic reactive power optimization mathematical model. The simulation results show that the mathematical model in this paper can adjust the output of the generators according to the actual situation effectively when the generators are in phase-leading operation. In addition, dynamic reactive power optimization reduces the number of control equipment's action at the cost of increasing active power loss in the whole network. So, In order to ensure the safe and economic operation of power grid, it is necessary to coordinate the relationship between active power loss and the constraints of control equipment's action. This paper has positive reference significance for power system dispatching. © 2019 IEEE.

关键词： Electric power transmission networks

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Thermal simulation optimization of DC charger based on ANSYS Icepak 14

Thermal simulation optimization of DC charger based on ANSYS...

引用

14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Wang, Yu Zhou, Feiyu Wen, Tan Su, Yan Yuan, Li Wang, Ke State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics College of Civil Aviation Nanjing China State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9798350301359

As one of the most important charging facilities for electric vehicles, DC chargers provide power supplements for electric vehicles. With the continuous development of DC chargers, the power density of their internal functional modules is also increasing. It is urgent to choose a reasonable heat dissipation method to reduce the overall temperature rise inside the DC charger and ensure its safe operation. In this paper, the 80kW DC charger is taken as the research object, and based on ANSYS Icepak thermal simulation software, the internal temperature field and fluid field of the DC charger are simulated and analyzed, and the design scheme of the DC charger is optimized by studying the heat dissipation system. Finally, the optimization scheme of the air duct structure of the system is obtained by adjusting the position of the heat dissipation fan. © 2023 IEEE.

关键词： ANSYS Icepak DC charger heat dissipation temperature thermal simulation

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