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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 Continuation Power Flow for High Penetration New Energy Power grid 6

Distributed Continuation Power Flow for High Penetration New...

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6th International Conference on Power and Energy Technology, ICPET 2024

作者： Dai, Zemei Chen, Tianhua Tang, Yi Zhao, Jinquan State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute Nanjing China College of Power and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9798350375855

The high penetration of new energy integration into the power grid has highlighted the problem of voltage stability. Continuation Power Flow (CPF) is an important tool for Voltage Stability Analysis (VSA). As the scale of new energy grid integration continues to expand, the method of power equivalent modeling of the aggregated grid in the main transmission network fails due to the neglect of the network structure and new energy models. This paper proposes a distributed voltage stability assessment method for high proportion new energy grids based on Distributed Continuation Power Flow (DCPF). The proposed method decomposes the global grid at the Point of Common Coupling (PCC) into new energy Sub-grids (SGs) and the transmission Main-grid (MG), achieving distributed computation of global grid voltage stability assessment by exchanging state information at the PCC between MG and SGs. Simulation results of the global power system show that the proposed method is effective. © 2024 IEEE.

关键词： Power grids

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

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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： 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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Cyber-attack-tolerant Frequency control of Power Systems

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 307-315页

作者： Chunyu Chen Kaifeng Zhang Ming Ni Ying Wang the School of Electrical and Power Engineering China University of Mining and TechnologyXuzhou 221116China the School of Automation Southeast UniversityNanjing 210096China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co. Ltd.Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Cyber attacks are emerging threats in the Internet of Things applications,and power systems are typical cyber attack *** one of the most essential operation functions,frequency control is threatened by cyber intrusions,and the existing centralized control mode cannot effectively address cyber *** this study,a new distributed cyber-attack-tolerant frequency control scheme is *** distributed control mode also serves as a convenient tool for attack *** designed cyber-attack-tolerant frequency controller adopts the idea of passive fault attenuation,thus simplifying the design *** the aid of graph theory and consensus techniques,distributed integral based and model predictive control(MPC)based controllers are *** with the integral type,the MPC-based controller can simultaneously improve the dynamic responses and the tolerance ability under *** proposed controller is validated via an IEEE benchmark system,and the effectiveness of its application in actual power systems is verified.

关键词： Frequency control cyber attack distributed control passive fault attenuation cyber-attack-tolerant frequency control

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A Simplified Matching Algorithm of the Carbon Neutrality Path for the Industry Zones 11

A Simplified Matching Algorithm of the Carbon Neutrality Pat...

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11th International Conference on Innovative smart grid Technologies - Asia, ISGT-Asia 2022

作者： Jin, Jingqi Li, Nan Lai, Yening Huang, Jie Chen, Xuetong NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China State Grid Qinghai Electric Power Company Economic and Technological Research Institute Xining China

ISBN: (纸本)9798350399660

After the carbon peaking and carbon neutrality goals were determined, industrial zones with high energy consumption began investigating their own carbon emission paths and formulating carbon emission reduction strategies. According to the zone's carbon emission projections, a reasonable estimate of the long-term carbon neutrality curve can be made, which has significant research implications for describing the carbon emission path and formulating carbon emission reduction measures. This paper uses the modified Kaya identity to build a model of the zone's carbon emissions. It proposes an algorithm for the zone's carbon-neutrality path matching the carbon peak path and determines the carbon emission peak year and carbon budget of the zone for achieving carbon peaking and carbon neutrality goals. © 2022 IEEE.

关键词： Carbon

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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...

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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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Rule Extraction-based Data Augmentation Method for Transient Instability Identification of Power Systems Using Machine Learning

Rule Extraction-based Data Augmentation Method for Transient...

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2019 IEEE Sustainable Power and Energy Conference, iSPEC 2019

作者： Zhou, Yanzhen Guo, Jian Guo, Qinglai Sun, Hongbin Lu, Yaohua Xu, Xiongfeng Tsinghua University Department of Electrical Engineering Beijing China Power Research Institute Nari Group Corporation State Grid Electric Jiangsu China State Key Laboratory of Smart Grid Protection and Control Jiangsu China

ISBN: (纸本)9781728149301

Machine learning methods have become a promising method for rapid identification of transient stability and unstable generators of power systems. However, the transient unstable instances are always fewer than stable instances, which brings difficulties of transient instability identification. This paper presents a data augmentation approach to increase the number of unstable instances. Firstly, original data will be generated by time domain simulation considering the randomness and limitations of power systems. Then, the patient rule induction space (Prism) method is used to obtain the unstable rule set from the training data. After that, new instances can be generated by the unstable rules and time domain simulation. Then, the machine learning method is used to generate the transient stability prediction model and unstable generator identification model based these two kinds of instances. All the generated instances can be verified by time domain simulation. Comprehensive studies are conducted on the New England 10-machine 39-bus system to verify the effectiveness of the proposed approach. © 2019 IEEE.

关键词： Transients

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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...

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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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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems 6

Analysis of Ultra-low Frequency Oscillation Stability of Pow...

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6th International Conference on Power and Energy Technology, ICPET 2024

作者： Cai, Kesu Liu, Dongsheng Zhao, Wenshuo Hong, Xi Yin, Yao Fei, Xuanqu State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China

ISBN: (纸本)9798350375855

The Low-Frequency Oscillation (LFO), Ultra-Low Frequency Oscillation (ULFO) and other oscillation can endanger the safety and stability operation of the power grid. However current relevant standards only have clear provisions on the critical damping ratio of LFO. Based on the risk of ULFO in high proportion hydropower systems, the principle and key influencing factors of ULFO are derived theoretically. According to the characteristics and hazards of ULFO, a method for determining the critical damping ratio of ULFO is explored, and the effectiveness of the method is tested through the actual response trajectory. © 2024 IEEE.

关键词： Damping

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