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A Fault Ride-Through Method of Paralleled Synchronous and Virtual Synchronous Generators in Islanded Microgrids 5

A Fault Ride-Through Method of Paralleled Synchronous and Vi...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Ru, Yanfei Zhao, Feng Jin, Zhangtao State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China College of Electrical and Information Engineering Hunan University Changsha410082 China

ISBN: (纸本)9781665434256

With the development of distributed power generation technologies, parallel operations of virtual synchronous generators (VSGs) and synchronous generators (SGs) become increasingly common in a microgrid. Due to the low overcurrent capacity of VSGs, fault ride-through (FRT) is necessary for microgrids, which makes the transient stability of SG-VSG-based microgrids be different from the traditional power system. In this paper, a new abnormal overcurrent phenomenon caused by FRT is discovered in SG-VSG-based islanded microgrids. Then, characteristics of the output current of the VSG which uses different parameters are compared and analyzed. Furthermore, an optimized FRT method is proposed, which suppresses the abnormal overcurrent. Finally, a simulation is performed to verify the effectiveness of the proposed method on the PSCAD/EMTDC. © 2021 IEEE

关键词： Synchronous generators

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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...

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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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Distributed transmission technology of node status in distribution network 2

Distributed transmission technology of node status in distri...

引用

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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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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Real Time Monitoring Method of Comprehensive Energy Consumption Based on Data Mining Algorithm

Real Time Monitoring Method of Comprehensive Energy Consumpt...

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作者： Qian, Gang Tang, Chenghong Meng, Yao Qi, Xiaomin Wang, Jingtao Zhou, Jing State Grid Shaoxing Power Supply Company Zhejiang Shaoxing312099 China State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Development Limited Company Nanjing211106 China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China China Electric Power Planning and Engineering Institute Beijing100120 China Beijing Nari Digital Technology Co. Ltd. Beijing100085 China

With the expansion of data centers, total consumption is growing exponentially. The center is faced with problems such as reducing power consumption, reducing costs and improving resource utilization. Reducing energy costs through monitoring is an important means of energy conservation in data centers. In recent years, more and more real-time energy consumption data are stored on the energy consumption management platform. There is a wealth of knowledge hidden in the energy consumption data in recent years. A large amount of data simplifies the traditional methods, and data mining methods have achieved good results in many fields. Therefore, it is of great significance to study a new energy consumption monitoring system and introduce data mining method into the system. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Energy utilization

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Tracking Status for Hardware-in-the-Loop Simulation Using RTDS

Tracking Status for Hardware-in-the-Loop Simulation Using RT...

引用

2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Liu, Qitao Hou, Yuqiang Xu, Jianbing Liu, Yongkang Nari Technology Co. Ltd Nanjing211106 China Nari Group Corporation State Grid Electric Power Research Institute Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9781665414395

The power system becomes more complex, due to the high penetration of renewable energy and more electronic devices are integrated to the traditional grid. SSCS is the critical task for power grid operation to ensure the control reliability and effectivity. It is inevitable to improve verification experiment technology for SSCS considering the development trend of the power system. RTDS is a powerful simulator for power system which is able to reflects the practical power system operation in real time. In this paper, a method for status tracking of power system model in RTDS is developed that SSCS is able to be verified under multiple operation conditions. It is found that the status cannot be tracked consistently as given, due to the limitations of RTDS models and raw data. The limitation in tracking reactive power output of generators is overcame in this paper. Besides, the development trend of online stability analysis and control is discussed as well as SSCS verification experiment technology. © 2021 IEEE.

关键词： Hardware-in-the-loop simulation

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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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Model Predictive control Based Active Frequency Support Strategy for Combined Wind/Photovoltaic/Storage Power Station

Model Predictive Control Based Active Frequency Support Stra...

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China International Electrical and Energy Conference (CIEEC)

作者： Manliang Wang Bingtuan Gao Yingwei Jiang Yunfeng Tian Wenqi Dong Xuewei Shi School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China State Grid Hebei Zhangjiakou Scenery Storage and Transmission New Energy Co. Ltd Zhangjiakou China

The high penetration of renewable energy sources connected to the grid has brought great challenges to the frequency stability of the power system. For the combined wind/pohotovoltaic/storage power station, it is of great significance for better frequency performance to realize the coordination control of active power. Therefore, this paper presents a frequency active support strategy for combined wind/pohotovoltaic/storage power station. By establishing the model of combined wind/pohotovoltaic/storage power station, this strategy applies model predictive control (MPC) to optimize the total active power reference value and the allocation of response power of the combined wind/pohotovoltaic/storage power station. For obtaining better frequency performance, this strategy aims at absorbing wind and solar energy resources and improving the economy of energy storage station. In order to verify the performance of the proposed strategy, it is compared with droop control using MATLAB/Simulink when the load increasing and decreasing respectively. The simulation results clearly show the effectiveness of the active frequency support strategy proposed in this paper.

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Multi-Objective Optimization of Magnetic Parameters in Wireless Charging Coupler Based on Deep Belief Network

Multi-Objective Optimization of Magnetic Parameters in Wirel...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yu Lan Jinhai Jiang Kai Song Fengshuo Yang Lin Sang Ke Wang Zhenjun Zhang Xuan Zhang Xuling Li School of Electrical Energineering and Automation Harbin Institute of Technology Harbin China State Key Laboratory of Smart Grid Protection and Operation Control Nari Technology CO. LTD. Nanjing China

The magnetic coupler is the core component of the wireless charging system. Its magnetic parameters have a significant effect on transmission performance. However, the current analytical models used for multi-objective optimization design are inadequate with poor calculation accuracy, leading to challenges in achieving comprehensive multi-objective optimal. This paper proposes an efficient fitness function modeling method for multi-objective optimization based on the deep belief network (DBN), enhancing both the design accuracy and optimization speed. Firstly, a three-dimensional magnetic circuit model is developed to consider the coil, magnetic core, and aluminum plate. Secondly, a loss correlation model of the magnetic coupler is established. Thirdly, the deep belief network (DBN) regression is utilized to obtain an accurate fitness characterization function. Finally, the fractional particle swarm optimization (FPSO) is applied to achieve the Pareto optimal solution of the magnetic coupler’s design parameters. In this work, the WPTI rectangular coil is taken as an illustrative example. An optimized design with a coupling coefficient of 0.23, transmission efficiency of 97.5%, and a weight of 9.6 kg is selected for experimental verification. The results demonstrate that the predicted values match the measurements with an error less than 5%.

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Smart substation network quality monitoring and fault prediction

Smart substation network quality monitoring and fault predic...

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2021 International Conference on Power Electronics and Power Transmission, ICPEPT 2021

作者： Li, Chao Peng, Qi Wang, Dehui Luo, Linglu Zuo, Huanhuan NARI Group Corporation State Grid Electric Power Research Institute Nanjing211006 China NARI Technology Co. Ltd. Nanjing211006 China State Key Laboratory of Smart Grid Protection and Control Nanjing210061 China

The smart substation communication network is the basis for information sharing of various devices in the substation. Its operation status has an important impact on the safe operation of the substation and even the power grid. Therefore, real-time status monitoring of the smart substation communication network is becoming more and more important. Aiming at the problems of single dimension, insufficient real-time performance and manual fault analysis in existing substation communication network state monitoring technology, this paper proposes a method of smart substation communication network state monitoring and fault prediction based on network communication quality. This paper uses switch ACL technology and coloring technology to obtain communication quality indexes such as bandwidth utilization, delay, and packet loss rate in real time;based on a multi-dimensional evaluation algorithm, a comprehensive evaluation model of network communication quality is constructed;the model of the relationship between abnormal network communication quality and failures is established. Finally, real-time monitoring of network communication quality and fault prediction are realized. The application analysis in a typical 110 kV substation shows that this method can effectively evaluate the network communication quality and accurately predict failures, and can guide operationer and maintenaner to quickly restore the normal operation of the communication network. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Telecommunication networks

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