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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Wu, Yuwei Wu, Hai Hu, Guo Zhihua, Xu Qi, Huang NARI Technology Development Co. Ltd. Nanjing211106 China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (纸本)9781665415965

Wind power has the characteristics of randomness and intermittent, with the increasing unit capacity of wind turbines and wind farm scale, it is urgent to study the impact on generation and transmission system reliability. In addition, there are different degrees of correlation among regional multiple wind farms because of their geographic proximity. When it comes to research on the influence on the power system reliability, the analysis result will be larger error without considering the correlation, which is optimistic for reliability assessment. Therefore, it is meaningful to take the correlation into account in wind power system reliability assessment. In this paper, IEEE-RTS 79 generation and transmission reliability test system is adopted to verify the reliability assessment of power systems with wind farms considering correlations. The experimental results show that adding wind turbines in the original power system, system reliability has been greatly improved;and the system has higher reliability with given the considering the correlation between wind farms. © 2021 IEEE.

关键词： Wind farm

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

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

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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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A Method for Locating Ground Faults in Distribution Network Based on Change of Longitudinal Current

A Method for Locating Ground Faults in Distribution Network ...

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2021 International Conference on control Science and Electric Power Systems, CSEPS 2021

作者： Lei, Xia Hai, Wu Guo, Hu Song, Hu State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China NARI Technology Development Co. Ltd. Jiangsu Nanjing211106 China

ISBN: (纸本)9781665426183

A new method for locating ground faults in distribution network was introduced by analysis of the characteristics of the ground fault for the isolated neutral system. The method by comparing the longitudinal current change of the adjacent measurement point to judge the ground fault location, and has verify it by building the simulation model on the PSCAD/EMTDC. The results show that the method has a strong ability of resistance to transition resistance. The specific implementation scheme was given based on the fault indicator which is widely used in distribution network at present. © 2021 IEEE.

关键词： Location

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Transient Stability Analysis of Paralleled grid-Forming Converters

Transient Stability Analysis of Paralleled Grid-Forming Conv...

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Energy, Power and Electrical Engineering (EPEE), International Conference on

作者： Kexin Yang Yanhong Bao Feng Wu Xiancheng Ren Jinlong Zhang Nanjing Normal University NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Technology Co. Ltd. Nanjing China

Interaction exists in multiple grid-forming converter parallel systems, resulting in different transient stability issues between multiple converter systems and single converter under large disturbances. During the current limiting period, the external characteristics of the grid-forming converter become current source, which causes three different external characteristic models of parallel converter. In this study, three models of parallel system were established, and the effect of different coupling power directions was analyzed based on the power angle curve. Further, the influence of different parameters of converter was discussed and three different cases of converter transient stability due to interaction was revealed. The interaction between converters is mainly determined by the coupling power direction. When the external characteristics of the converters are the same, the coupling power direction is mainly determined by the power angle. When the external characteristics are different, the coupling power direction is determined by the current limiting strategy. The correctness of the theoretical analysis was verified based on the PSCAD platform.

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Clustering of Photovoltaic Power Stations Based on the Improved AP Clustering Algorithm 49

Clustering of Photovoltaic Power Stations Based on the Impro...

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49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Ding, Yawen Gao, Fei Jiang, Yingwei Hou, Kai Zhang, Donghui Shi, Xuewei College of Smart Energy Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Dept. of Electrical Engineering Shanghai China Nanjing China State Grid Jibei Zhangjiakou Wind and Solar Energy Storage and Transportation New Energy Co. Ltd Zhangjiakou China

ISBN: (纸本)9798350331820

To deal with the problem that uncertain parameter in Affinity Propagation (AP) clustering algorithm affects the clustering results, this paper proposes a clustering method based on AP clustering algorithm and Genetic Algorithm (GA) for Photovoltaic (PV) power stations. Firstly, the modeling of PV power stations is established and clustering index are determined according to the dynamic characteristics of PV power stations. Then the proposed method takes the silhouette index, which is used to evaluate the quality of the clustering result, as the fitness function of GA. The bias parameter placed on the main diagonal of the similarity matrix in the AP clustering algorithm is constantly iterated and updated until obtaining the optimization result. Finally, the studied case verifies the better clustering performance of the proposed method. The 20 PV power stations in the Taoling Substation can be simplified into three groups, reducing the complexity and calculation time for equivalent modeling. © 2023 IEEE.

关键词： Genetic algorithms

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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...

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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

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

ISBN: (纸本)9781728143033

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. © 2020 IEEE.

关键词： HVDC power transmission

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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...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

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

ISBN: (纸本)9781728191645

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. © 2020 IEEE.

关键词： Merging

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Predicting impact forces on pipelines from deep-sea fluidized slides:A comprehensive review of key factors

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International Journal of Mining Science and Technology 2024年第2期34卷 211-225页

作者： Xingsen Guo Ning Fan Defeng Zheng Cuiwei Fu Hao Wu Yanjun Zhang Xiaolong Song Tingkai Nian State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Department of Civil Environmentaland Geomatic EngineeringUniversity College LondonLondon WC1E 6BTUnited Kingdom Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Civil Engineering and Architecture Wenzhou UniversityWenzhou 325035China Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province Wenzhou 325035China Zhejiang International Science and Technology Cooperation Base of Ultra-soft Soil Engineering and Smart Monitoring Wenzhou 325035China School of Geography Liaoning Normal UniversityDalian 116029China China Railway First Survey and Design Institute Group Co. Ltd.Xi’an 710043China Department of Geotechnical Engineering Nanjing Hydraulic Research InstituteNanjing 210024China Wuhan Center China Geological Survey(Central South China Innovation Center for Geosciences)Wuhan 430205China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China

Deep-sea pipelines play a pivotal role in seabed mineral resource development,global energy and resource supply provision,network communication,and environmental ***,the placement of these pipelines on the seabed surface exposes them to potential risks arising from the complex deep-sea hydrodynamic and geological environment,particularly submarine *** incidents have highlighted the substantial damage to pipelines due to ***,deep-sea fluidized slides(in a debris/mud flow or turbidity current physical state),characterized by high speed,pose a significant *** assessing the impact forces exerted on pipelines by fluidized submarine slides is crucial for ensuring pipeline *** study aimed to provide a comprehensive overview of recent advancements in understanding pipeline impact forces caused by fluidized deep-sea slides,thereby identifying key factors and corresponding mechanisms that influence pipeline impact *** factors include the velocity,density,and shear behavior of deep-sea fluidized slides,as well as the geometry,stiffness,self-weight,and mechanical model of ***,the interface contact conditions and spatial relations were examined within the context of deep-sea slides and their interactions with *** upon a thorough review of these achievements,future directions were proposed for assessing and characterizing the key factors affecting slide impact loading on pipelines.A comprehensive understanding of these results is essential for the sustainable development of deep-sea pipeline projects associated with seabed resource development and the implementation of disaster prevention measures.

关键词： Deep-sea fluidized slides Pipes Impact forces Shear behavior of slides Interface contact conditions Spatial relation

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Influence Analysis of control Parameters on Transient Stability of Single-loop Voltage-Magnitude controlled grid-Forming Converter

Influence Analysis of Control Parameters on Transient Stabil...

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Asia Conference on Energy and Environment Engineering (ACEEE)

作者： Kexin Yang Yanhong Bao Xiancheng Ren Feng Wu Jinlong Zhang NARI Technology Co. Ltd. Nanjing Normal University Nanjing China NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

With the gradual increase in the proportion of new energy generation, grid-forming control with dynamic regulation and support capability of frequency and voltage has become a research hotspot. However, the current-limiting control of the converter reduces the transient stability margin and leads to the complex evolution of the transient instability mode, which poses a great challenge to the stable operation of new energy units. In this paper, the influence of different current limiting strategies on the transient stability of the single-loop voltage-magnitude controlled grid-forming converter is analyzed, and three typical instability evolution modes are summarized. Further, the influence law of virtual inertia and damping parameters on the transient stability is analyzed by critical clearing angle (CCA), and critical clearing time (CCT), the mechanism of abnormal phenomena of virtual inertia and damping parameters on transient stability is revealed based on the equal area criterion, and the conditions for abnormal phenomena are clarified, finally, the transient instability evolution modes and the mechanism of abnormal phenomena is verified by electromagnetic transient time domain simulation.

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Organizational Description System for Digital Twin of Distribution Network Equipment Based on Object-oriented Equipment Model

Organizational Description System for Digital Twin of Distri...

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Power System and Green Energy Conference (PSGEC)

作者： Jingru Zang Jin Xu keyou Wang Lin Peng Zhimin He Zhujian Ou Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China State Grid Smart Grid Research Institute Co. Ltd Nanjing China State Grid Nantong Power Supply Company Nantong China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Digital twin is a mathematical model of a physical object that can accept real-time data and evolve in real time. The fundamental technology underlying digital twin technology is modeling and simulation. For a distribution network with complex structure and numerous devices, the construction of digital twins is of great significance for equipment management and system analysis. This paper first introduces the object-oriented modeling method and presents an object-oriented equipment model (OEM). Subsequently, an organizational description system for digital twin of distribution network equipment based on object-oriented equipment model is designed, and the concrete implementation method is introduced. Finally, by comparing with the simulation results of PSCAD software, the accuracy of the electromagnetic transient (EMT) simulation program, one of the applications of the proposed system, is verified.

关键词： Object oriented modeling Simulation Distribution networks Production Real-time systems Mathematical models Spatial databases Software Scheduling Digital twins

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