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Global Energy Interconnection 2024年第1期7卷 94-105页

作者： Pengtian Guo Kai Xiao Xiaohui Wang Daoxing Li China Electric Power Research Institute Co.Ltd. Beijing 100192P.R.China

The power Internet of Things(IoT)is a significant trend in technology and a requirement for national strategic development.With the deepening digital transformation of the power grid,china’s power system has initially built a power IoT architecture comprising a perception,network,and platform application layer.However,owing to the structural complexity of the power system,the construction of the power IoT continues to face problems such as complex access management of massive heterogeneous equipment,diverse IoT protocol access methods,high concurrency of network communications,and weak data security protection.To address these issues,this study optimizes the existing architecture of the power IoT and designs an integrated management framework for the access of multi-source heterogeneous data in the power IoT,comprising cloud,pipe,edge,and terminal parts.It further reviews and analyzes the key technologies involved in the power IoT,such as the unified management of the physical model,high concurrent access,multi-protocol access,multi-source heterogeneous data storage management,and data security control,to provide a more flexible,efficient,secure,and easy-to-use solution for multi-source heterogeneous data access in the power IoT.

关键词： power Internet of Things Object model High concurrency access Zero trust mechanism Multi-source heterogeneous data

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Global Energy Interconnection 2023年第1期6卷 15-25页

作者： Kai Xiao Daoxing Li Pengtian Guo Xiaohui Wang Yong Chen China Electric Power Research Institute Co.Ltd. Beijing 100192P.R.China

Operation control of power systems has become challenging with an increase in the scale and complexity of power distribution systems and extensive access to renewable energy.Therefore,improvement of the ability of data-driven operation management,intelligent analysis,and mining is urgently required.To investigate and explore similar regularities of the historical operating section of the power distribution system and assist the power grid in obtaining high-value historical operation,maintenance experience,and knowledge by rule and line,a neural information retrieval model with an attention mechanism is proposed based on graph data computing technology.Based on the processing flow of the operating data of the power distribution system,a technical framework of neural information retrieval is established.combined with the natural graph characteristics of the power distribution system,a unified graph data structure and a data fusion method of data access,data complement,and multi-source data are constructed.Further,a graph node feature-embedding representation learning algorithm and a neural information retrieval algorithm model are constructed.The neural information retrieval algorithm model is trained and tested using the generated graph node feature representation vector set.The model is verified on the operating section of the power distribution system of a provincial grid area.The results show that the proposed method demonstrates high accuracy in the similarity matching of historical operation characteristics and effectively supports intelligent fault diagnosis and elimination in power distribution systems.

关键词： Neural information retrieval power distribution Graph data Operating section Similarity matching

Towards sparse matrix operations:graph database approach for power grid computation

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Global Energy Interconnection 2023年第1期6卷 50-63页

作者： Daoxing Li Kai Xiao Xiaohui Wang Pengtian Guo Yong Chen China Electric Power Research Institute Co.Ltd. Beijing 100192P.R.China

The construction of new power systems presents higher requirements for the power Internet of Things(PIoT)technology.The“source-grid-load-storage”architecture of a new power system requires PIoT to have a stronger multi-source heterogeneous data fusion ability.Native graph databases have great advantages in dealing with multi-source heterogeneous data,which make them suitable for an increasing number of analytical computing tasks.However,only few existing graph database products have native support for matrix operation-related interfaces or functions,resulting in low efficiency when handling matrix calculations that are commonly encountered in power grids.In this paper,the matrix computation process is expressed by a strategy called graph description,which relies on the natural connection between the matrix and structure of the graph.Based on that,we implement matrix operations on graph database,including matrix multiplication,matrix decomposition,etc.Specifically,only the nodes relevant to the computation and their neighbors are concerned in the process,which prunes the influence of zero elements in the matrix and avoids useless iterations compared to the conventional matrix computation.Based on the graph description,a series of power grid computations can be implemented on graph database,which reduces redundant data import and export operations while leveraging the parallel computing capability of graph database.It promotes the efficiency of PIoT when handling multi-source heterogeneous data.An comprehensive experimental study over two different scale power system datasets compares the proposed method with Python and MATLAB baselines.The results reveal the superior performance of our proposed method in both power flow and N-1 contingency computations.

关键词： Graph database Graph description Matrix Parallel computing power flow

Modeling and application of marketing and distribution data based on graph computing

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Global Energy Interconnection 2022年第4期5卷 448-460页

作者： Kai Xiao Daoxing Li Xiaohui Wang Pengtian Guo China Electric Power Research Institute Co.Ltd. Beijing 100192P.R.China

Integrating marketing and distribution businesses is crucial for improving the coordination of equipment and the efficient management of multi-energy systems.New energy sources are continuously being connected to distribution grids;this,however,increases the complexity of the information structure of marketing and distribution businesses.The existing unified data model and the coordinated application of marketing and distribution suffer from various drawbacks.As a solution,this paper presents a data model of"one graph of marketing and distribution"and a framework for graph computing,by analyzing the current trends of business and data in the marketing and distribution fields and using graph data theory.Specifically,this work aims to determine the correlation between distribution transformers and marketing users,which is crucial for elucidating the connection between marketing and distribution.In this manner,a novel identification algorithm is proposed based on the collected data for marketing and distribution.Lastly,a forecasting application is developed based on the proposed algorithm to realize the coordinated prediction and consumption of distributed photovoltaic power generation and distribution loads.Furthermore,an operation and maintenance(O&M)knowledge graph reasoning application is developed to improve the intelligent O&M ability of marketing and distribution equipment.

关键词： Marketing and distribution connection Graph data Graph computing Knowledge graph Data model

Experimental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

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High Voltage 2024年第1期9卷 182-194页

作者： Lin Yang Zhiqiang Chen Yanpeng Hao Xinhao Lin Lei Yu Yue Li Zhiyong Yuan Licheng Li School of electric power South China University of TechnologyGuangzhouChina electrical power research institute China Southern Power GridGuangzhouChina electric power research institute of Guizhou power Grid co.ltd. GuizhouChina

Ice monitoring methods were applied for 110 kV and above transmission lines with tangent towers.However,the change in the vertical span is not considered,and a significant difference lies in the tower-conductor structure of 10 kV transmission lines.For this reason,a proposal is made about the ice monitoring method for the 10 kV transmission line with tangent tower in alpine landform,which includes the ice monitoring system based on pressure measurement and corresponding equivalent ice thickness calculating methods.Different methods calculate the vertical span under different height difference coefficients.A finite element simulation model and a simulated ice load experiment system are established based on real conductors and insulators.Experiments and simulations under four simulated terrains are conducted within 2.5–20 mm ice thickness range.The comparison is made between this method and the method without considering the change in vertical span.The results show that the two methods are consistent and the relative errors are lower than�4%in simulation and�10%in experiment when the height difference coefficient is 0.When it is not 0,the relative errors of this method fall between t0.38%and t6.78%in simulation and−6.40%to t6.60%in experiment,while the relative errors of the method without considering the change in vertical span ranges between−11.13%and−20.23%in simulation and−11.65%to−23.20%in experiment.

关键词： methods tangent method

Multi‐type defect detection and location based on non‐destructive impedance spectrum measurement for underground power cables

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High Voltage 2023年第5期8卷 977-985页

作者： Jingang Su Liqiang Wei Peng Zhang Yan Li Yunpeng Liu electric power research institute of State Grid Hebei electric power Supply co.ltd. ShijiazhuangChina School of electrical and Electronic Engineering North China Electric Power UniversityBaodingChina

power cable defect detection and location is a crucial aspect in power asset maintenance.Impedance spectrum measurement can be used as a non‐destructive tool for cable monitoring.Defects from overheating and moisture ingress are investigated by the authors,and it is shown that multi‐type cable defects can be detected and located by this methodology.With both electromagnetic analysis and experimental investigation,the relation between impedance variation and the dielectric permittivity is studied to reveal the method's mechanism.An approach to implement such impedance measurement online is proposed and its perspectives in terms of sensitivity is investigated by field scale tests.It is shown that 2%impedance variation due to defect should be detectable.Field scale tests show perspectives for online application with signal coupling through a highfrequency current transformer with focus on the differences in waveforms obtained from the impedance measurements.

关键词： power impedance defect

research on task scheduling and concurrent processing technology for energy internet operation platform

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Global Energy Interconnection 2022年第6期5卷 579-589页

作者： Zhixiang Ji Xiaohui Wang Dan Wu China Electric Power Research Institute Co.Ltd. Beijing 100192P.R.China State Grid Fujian electric power research institute Fuzhou 350001P.R.China

The energy Internet operation platform provides market entities such as energy users,energy enterprises,suppliers,and governments with the ability to interact,transact,and manage various operations.Owing to the large number of platform users,complex businesses,and large amounts of data-mining tasks,it is necessary to solve the problems afflicting platform task scheduling and the provision of simultaneous access to a large number of users.This study examines the two core technologies of platform task scheduling and multiuser concurrent processing,proposing a distributed task-scheduling method and a technical implementation scheme based on the particle swarm optimization algorithm,and presents a systematic solution in concurrent processing for massive user numbers.Based on the results of this study,the energy internet operation platform can effectively deal with the concurrent access of tens of millions of users and complex task-scheduling problems.

关键词： Energy Internet Distributed task scheduling concurrent processing

Ce-Ti catalysts modified with copper and vanadium to effectively remove slip NH_(3) and NO_x from coal-fired plants

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Journal of Rare Earths 2023年第7期41卷 1022-1030,I0002页

作者： Wenjie Liu Yifei Long Shinian Liu Yongyan Zhou Xin Tong Yajie Yin Xiaoyi Li Kang Hu Jiangjun Hu School of Resource and Environmental Sciences Wuhan UniversityWuhan 430079China china Southern power Grid Technology co. Ltd.Guangzhou 510080China electric power research institute of Guangdong power Grid co.ltd. Guangzhou 510080China

In this work,V/Ce-Ti catalysts were modified with different kinds of transition metals(Cu,Fe,co,Mn) by sol-gel and impregnation methods.The NH_(3) oxidation performance of them was tested to select the most active catalyst in NH_(3)-selective catalytic oxidation(NH_(3)-Sco).The effect of NO,SO_(2) and H_(2)O was also investigated.The experimental results indicate that 1% Cu-V/Ce-Ti catalyst exhibits the most significant ability to remove slip ammonia discharged from coal-fired plants and its NH_(3) conversion efficiency reaches90% at 300℃.In additio n,97% NO_x can be removed when NO is introduced in the gas.Cu-V/Ce-Ti catalyst also obtains good resistance to H_(2)O and SO_(2).Based on the characterization experiment,the introduced Cu and V are highly dispersed on Ce-Ti catalyst and they can increase the redox properties and the number of acidic sites.Besides,the redox cycles among Cu,V and Ce species on Cu-V/Ce-Ti catalyst surface are conducive to generating more active oxygen and promoting the oxidation capacity of the catalyst.

关键词： Ce-Ti catalyst Transition metals Slip ammonia NO reduction Rare earths

Non-destructive thermal ageing evaluation of P(VDF-HFP)film based on broadband dielectric response

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High Voltage 2022年第6期7卷 1123-1129页

作者： Qian Wang Chao Wu Yanfeng Gao Shuming Liu Shuqi Liu Zhou Zuo Xidong Liang Department of electrical Engineering State Key Lab of Power SystemTsinghua UniversityBeijingChina electrical Insulation research Center Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA State Grid Jibei electric power co.ltd.research institute North China Electric Power Research Institute Co.Ltd.BeijingChina

Capacitors and sensors based on polymer dielectric materials are key components in electrical systems and electronic devices.considering the temperature rise during operation,an effective evaluation method for the thermal ageing of polymer matrix is urgently needed.P(VDF-HFP)film with a thickness of 20μm is manufactured by solution casting and a thermal ageing experiment up to 1000 h is conducted.Dielectric responses of wide ranges of temperatures and frequencies are measured for samples with different ageing durations.The universal relaxation law and Dissado–Hill dielectric response model are applied to further investigate the results.The characteristics of individual processes are obtained,which demonstrate that the main chain relaxation following the Vogel−Fulcher−Tammann equation and side chain relaxation following the Arrhenius equation both remain unchanged after thermal ageing.However,the activation energies of those two processes change significantly during the process and show different variation trends.The activation energy of the side chain relaxation gets larger monotonically due to the influence of annealing and the breaking of crystalline region.As a result,a non-destructive evaluation method for the thermal ageing of P(VDF-HFP)is proposed accordingly.

关键词： casting thermal relaxation

Dynamic phasor-based hybrid simulation for multi-inverter grid-connected system

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Global Energy Interconnection 2023年第2期6卷 197-204页

作者： Peng Yang Qian Li Junyu Zhao Juanjuan Lu Yunfei Xu State Grid Hebei electric power co.ltd. Shijiazhuang 050021P.R.China State Grid Baoding power Supply company Baoding 071051P.R.China State Grid Smart Grid research institute co.ltd. Beijing 102200P.R.China

To realize the efficient transient simulation of a grid-connected power generation system based on multiple inverters, this paper proposes a hybrid simulation method integrating the models of electromagnetic transient and dynamic phasors. Based on a demonstration of the concepts and properties of dynamic phasors, the models of single-phase and three-phase inverters described by dynamic phasors are established first. considering the numerical compatibility problem between dynamic phasors and instantaneous values, an interface scheme between dynamic phasors and instantaneous values is designed, and the efficiency and precision differences of various transformation methods are compared in detail.Finally, by utilizing MATLAB/Simulink, a hybrid simulation platform of a multi-inverter grid-connected system is built, and the efficiency and accuracy of the hybrid simulation are validated via comparison with the full electromagnetic transient simulation.

关键词： Multi-inverter grid-connected system Electromagnetic transient Dynamic phasor Hybrid simulation