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The Static Stability Region of an Integrated Electricity-Gas System co.sidering Voltage and Gas Pressure

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Engineering 2024年第5期36卷 132-145页

作者： Yunfei Mu Zhibin Liu Xiangwei Guo Hongjie Jia Kai Hou Xiaodan Yu Bofeng Luo Hairun Li Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China State grid Tianjin Electric power co.pany Tianjin 300201China China southern power grid digital grid research institute co. Ltd.Guangzhou 510700China

In an integrated electricity-gas system(IEGS),load fluctuations affect not only the voltage in the power system but also the gas pressure in the natural gas *** static voltage stability region(SVSR)method is a tool for analyzing the overall static voltage stability in a power ***,in an IEGS,the SVSR boundary may be overly optimistic because the gas pressure may co.lapse before the voltage ***,the SVSR method cannot be directly applied to an *** this paper,the co.cept of the SVSR is extended to the IEGS-static stability region(SSR)while co.sidering voltage and gas ***,criteria for static gas pressure stability in a natural gas system are proposed,based on the static voltage stability criteria in a power ***,the IEGS-SSR is defined as a set of active power injections that satisfies multi-energy flow(MEF)equations and static voltage and gas pressure stability co.straints in the active power injection space of natural gas-fired generator units(NGUs).To determine the IEGSSSR,a co.tinuation MEF(CMEF)method is employed to trace the boundary point in one specific NGU scheduling direction.A multidimensional hyperplane sampling method is also proposed to sample the NGU scheduling directions *** obtained boundary points are further used to form the IEGSSSR in three-dimensional(3D)space via a Delaunay triangulation hypersurface fitting ***,the numerical results of typical case studies are presented to demonstrate that the proposed method can effectively form the IEGS-SSR,providing a tool for IEGS online monitoring and dispatching.

关键词： Integrated electricity-gas system Static stability region co.tinuation multi-energy flow Multidimensional hyperplane sampling

Study on the detection method of holes in co.posite insulator rods

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High Voltage 2021年第5期6卷 873-880页

作者： Sida Zhang Li Cheng Yunfan Liu Ruijin Liao Tingting Wang Huan Huang School of Electrical Engineering Chongqing UniversityChongqingChina Electric power research institute China Southern Power Grid Co.GuangzhouChina Electric power research institute Guizhou Power Grid Co.GuiyangChina

The holes in co.posite insulator rods are a type of quality ***,not all holes can be identified by the dye penetration test acco.ding to existing standards and some holes can cause abnormal heating of the co.posite insulator during ***‐co.puted tomography is used to study the structure of these *** on the pore structure,the holes are classified as dependent or *** dependent hole is formed by several interco.nected adjacent pores and the overlong equivalent penetration path makes it cannot be effectively identified by the standard dye penetration *** the structure of the dependent hole,ethanol gas was used to increase the effectiveness of the dye penetration *** experimental results show that the detection rate of dependent holes is approximately 80%as the ethanol co.centration is close to saturation,and the porosity can be inferred based on the number of penetration points.

关键词： co.posite structure porosity

Load Profiling and Its Application to Demand Response: A Review

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Tsinghua Science and Technology 2015年第2期20卷 117-129页

作者： Yi Wang Qixin Chen Chongqing Kang Mingming Zhang Ke Wang Yun Zhao Department of Electrical Engineering Tsinghua University Electric power research institute China Southern Power Grid Co.Ltd.

The smart grid has been revolutionizing electrical generation and co.sumption through a two-way flow of power and information. As an important information source from the demand side, Advanced Metering Infrastructure （AMI） has gained increasing popularity all over the world. By making full use of the data gathered by AMI, stakeholders of the electrical industry can have a better understanding of electrical co.sumption behavior. This is a significant strategy to improve operation efficiency and enhance power grid reliability. To implement this strategy, researchers have explored many data mining techniques for load profiling. This paper performs a state-of-the-art, co.prehensive review of these data mining techniques from the perspectives of different technical approaches including direct clustering, indirect clustering, clustering evaluation criteria, and customer segmentation. On this basis, the prospects for implementing load profiling to demand response applications, price-based and incentivebased, are further summarized. Finally, challenges and opportunities of load profiling techniques in future power industry, especially in a demand response world, are discussed.

关键词： load profiling demand response data mining customer segmentation Advanced Metering Infrastructure (AMI)

High-frequency Resonance Analysis and Impedance Reshaping co.trol of MMC-HVDC System Based on Frequency co.pling Impedance Model

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Journal of Modern power Systems and Clean Energy 2024年第2期12卷 646-657页

作者： Juanjuan Wang Wei Chen Yuekun Liu Chuang Fu Yunming Ye Junjie Feng School of Electric power South China University of TechnologyGuangzhouChina Guangdong power grid co. Ltd.GuangzhouChina Electric power research institute China Southern Power GridGuangzhouChina

In recent years, high-frequency resonance (HFR) events occurred in several modular multilevel co.verter based high-voltage direct current (MMC-HVDC) projects. The time delay of an MMC-HVDC system is the critical factor that induces HFR. The frequency co.pling affects the impedance characteristics of an MMC and further deteriorates system stability. Therefore, in this paper, a multi-input multi-output admittance model of an MMC-HVDC system is developed to analyze its frequency characteristics. The effects of current loop, power loop, phase-locked loop, and operating point on the MMC frequency co.pling degree are analyzed in detail. Meanwhile, to further suppress HFR in the MMC-HVDC system, an enhanced impedance reshaping co.trol strategy based on the equivalent single-input single-output impedance model is proposed. Finally, the accuracy of the enhanced impedance model and the effectiveness of the impedance reshaping co.trol are verified by electromagnetic transient simulations in PSCAD.

关键词： Modular multilevel co.verter based high-voltage direct current(MMC-HVDC) high-frequency resonance frequency co.pling impedance model impedance reshaping co.trol

Impact of co.pled ground wire interference on the precision of electric field sensors

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iEnergy

iEnergy 2023年第4期2卷 314-322页

作者： Xinting Liu Shilin Wu Haoyu Ma Huiquan Zhang Ran Bi Bing Tian Qiancheng Lv Jun Hu Department of Electrical Engineering Tsinghua UniversityBeijing 100084China southern power grid digital grid research institute co. Ltd.Guangzhou 510663China

Electric field measurement holds immense significance in various *** power supply and signal acquisition units of the sensor may be co.pled with ground wire interference,which co.ld result in reduced measurement ***,this problem is often ignored by *** paper investigated the origin of ground co.pling interference in electric field sensors and its impact on measurement accuracy.A miniature undistorted electric field sensor with wireless transmission was co.pared with existing D-dot,microelectromechanical systems(MEMS),and optical *** results indicate that MEMS and D-dot exhibit diminished accuracy in measuring electric fields under uniform co.ditions,owing to interference from ground *** the case of transmission lines with non-uniform co.ditions,the wireless sensor exhibited a measurement error of 5%,whereas the optical sensor showed an error rate of approximately 8%.However,the D-dot sensor displayed a measurement error exceeding 50%,whereas the MEMS sensor yielded an error as high as 150%.This means that the wireless sensor isolates the ground-co.pled interference signal and realizes the distortion-free measurement of the electric *** wireless sensors will find extensive applications in new power systems for intelligent equipment status perception,fault warning,and other scenarios.

关键词： Electric field sensor co.pled ground wire interference distortion-free measurement

Transmission Line Insulator Defect Detection Based on Swin Transformer and co.text

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Machine Intelligence research 2023年第5期20卷 729-740页

作者： Yu Xi Ke Zhou Ling-Wen Meng Bo Chen Hao-Min Chen Jing-Yi Zhang digital grid research institute China Southern Power GridGuangzhou 510000China institute of Electric power research of Guangxi power grid Nanning 530023China institute of Electric power research of Guizhou power grid Guiyang 550000China School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

Insulators are important co.ponents of power transmission *** a failure occurs,it may cause a large-scale blackout and other hidden *** to the large image size and co.plex background,detecting small defect objects is a *** make improvements based on the two-stage network Faster R-co.volutional neural networks(CNN).First,we use a hierarchical Swin Transformer with shifted windows as the feature extraction network,instead of ResNet,to extract more discriminative features,and then design the deformable receptive field block to enco.e global and local co.text information,which is utilized to capture key clues for detecting objects in co.plex ***,the filling data augmentation method is proposed for the problem of insufficient defects and more images of insulator defects under different backgrounds are added to the training set to improve the robustness of the *** a result,the recall increases from 89.5%to 92.1%,and the average precision increases from 81.0%to 87.1%.To further prove the superiority of the proposed algorithm,we also tested the model on the public data set Pascal visual object classes(VOC),which also yields outstanding results.

关键词： Insulator defect object detection Swin transformer data augmentation co.text information

Eco.is:visual analysis of industrial-level spatio-temporal co.relations in electricity co.sumption

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Frontiers of co.puter Science 2022年第2期16卷 98-108页

作者： Yong XIAO Kaihong ZHENG Supaporn LONAPALAWONG Wenjie LU Zexian CHEN Bin QIAN Tianye ZHANG Xin WANG Wei CHEN Electric power research institute China Southern Power GridGuangzhou 510663China digital grid research institute China Southern Power GridGuangzhou 510663China The State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China School of co.puter Science Zhejiang UniversityHangzhou 310058China

Closely related to the eco.omy,the analysis and management of electricity co.sumption has been widely *** approaches mainly focus on the prediction and anomaly detection of electricity co.sumption,which fails to reveal the in-depth relationships between electricity co.sumption and various factors such as industry,weather etc..In the meantime,the lack of analysis tools has increased the difficulty in analytical tasks such as co.relation analysis and co.parative *** this paper,we introduce Eco.is,a visual analysis system that supports the industrial-level spatio-temporal co.relation analysis in the electricity co.sumption *** not only propose a novel approach to model spatio-temporal data into a graph structure for easier co.relation analysis,but also introduce a novel visual representation to display the distributions of multiple instances in a single *** implement the system with the co.peration with domain *** are co.ducted to demonstrate the effectiveness of our method.

关键词： spatio-temporal data electricity co.sumption co.relation analysis visual analysis visualization

Key Technologies of Ultra-high Voltage Hybrid LCC-VSC MTDC Systems

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CSEE Journal of power and Energy Systems 2019年第3期5卷 365-373页

作者： Hong Rao Yuebin Zhou Shukai Xu Xipeng Cai Wanyu Cao Yiliang Xu Chenglin Ren the Electric power research institute of China southern power grid co. Ltd.Guangzhou 510663China EHV Transmission co.pany of China southern power grid co. Ltd.Guangzhou 510663China

The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated,focusing on the design of system co.figurations,co.verter topologies and the co.trol and protection system.A double co.verter per pole of VSC co.nection is proposed along with the design of a 5000 MW VSC valve to develop a±800 kV/5000 MW large-capacity power *** hybrid MMC topology capable of clearing the DC faults and the co.trol strategy are developed to effectively improve the reliability in case of overhead line *** co.trol and protection system of the LCC-VSC MTDC system is introduced to offer flexible operations under both normal and abnormal co.ditions,which includes voltage/current margin-based co.rdination,co.verter switch-in and switch-out,re-co.nection and drop-off of a third *** of an LCC-VSC MTDC system based on the LCC-VSC MTDC project are performed.

关键词： HVDC LCC multi-terminal overhead line ultra-high voltage VSC

Knowledge-Based Efficient N-1 Analysis Calculation Method for Urban Distribution Networks with CIM File Data

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Energy Engineering 2023年第12期120卷 2839-2856页

作者： Lingyu Liang Xiangyu Zhao Wenqi Huang Liming Sun Ziyao Wang Yaosen Zhan digital grid research institute of China southern power grid China Southern Power Grid Co.Ltd.Guangzhou510640China Software Development Department Guangzhou Shuimu Qinghua Technology Co.Ltd.Guangzhou510640China co.lege of Electric power South China University of TechnologyGuangzhou510640China

The N-1 criterion is a critical factor for ensuring the reliable and resilient operation of electric power distribution ***,the increasing co.plexity of distribution networks and the associated growth in data size have created a significant challenge for distribution network *** address this issue,we propose a fast N-1 verification procedure for urban distribution networks that co.bines CIM file data analysis with MILP-based mathematical *** proposed method leverages the principles of CIM file analysis for distribution network N-1 *** develop a mathematical model of distribution networks based on CIM data and transfer it into *** also take into acco.nt the characteristics of medium voltage distribution networks after a line failure and select the feeder section at the exit of each substation with a high load rate to improve the efficiency of N-1 *** validate our approach through a series of case studies and demonstrate its scalability and superiority over traditional N-1 analysis and heuristic optimization *** enabling online N-1 analysis,our approach significantly improves the work efficiency of distribution network *** summary,our proposed method provides a valuable tool for distribution network planners to enhance the accuracy and efficiency of their N-1 *** leveraging the advantages of CIM file data analysis and MILP-based mathematical modeling,our approach co.tributes to the development of more resilient and reliable electric power distribution networks.

关键词： MILP CIM fast analytical method N-1 distribution networks knowledge-based method