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2020 International Conference on Ubiquitous power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and smart grid, SGESG 2020

作者： Tang, Xiaoliang Yang, Fang Zhou, Yabing Zhang, Guangyi Gong, Jie Qingyuan Power Supply Bureau China Southern Power Grid Corporation Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Flexible Multi-states Switch based on power electronics technology can realize the flexible interconnection between feeders, elastically control feeder power flow and solve the serious unbalance of feeder power flow in the distribution network. To solve the problem, this paper proposes that using flux-controlled variable reactor as the topology of flexible multi-states switch in distribution network. Firstly, flux-controlled variable reactor's principle will be introduced;Then, we analyze the principle of feeder power flow's control using variable reactor;After that, the control strategy for the flexible multi-states switch with different access methods is proposed;At last, a MATLAB simulation model and the prototype experiment platform are built. The results verified the power flow control function of flexible multi-states switch and effectiveness of proposed controlled strategy. © Published under licence by IOP Publishing Ltd.

关键词： MATLAB

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Research on Circuit Breaker Switching Model Modified Based on Measured Data Considering Multi Stochastic Factors 7

Research on Circuit Breaker Switching Model Modified Based o...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Zhou, Fangrong Tang, Wei Ma, Yi Peng, Qingjun Ma, Yutang Yuan, Tao Electric Power Research Institute of Yunnan Power Grid Cooperation Yunnan China State Key Laboratory of Power Transmission Equipment System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Vacuum circuit breakers (VCBs) are commonly used to switch shunt reactive power equipment in distribution networks. There are many stochastic factors in the switching process of the VCBs, which results in a statistical distribution of the switching overvoltage under a large number of switching operations. The parameters of the traditional circuit breaker models are usually fixed, so it is difficult to evaluate and track the overvoltage risk under daily switching. In order to solve this problem, considering multi stochastic factors in the switching process, a 10kV circuit breaker switching model modified based on measured data is established in MATLAB. Using the modeling method proposed in this paper, the model parameters can be constantly corrected by the measured data to improve the accuracy of the simulation results. Finally, it can be used to track and analysis the risks of switching overvoltage. © 2020 IEEE.

关键词： Electric circuit breakers

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Statistical characteristics and mechanism analysis of adhered particle on surface under strong electric field

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Particuology 2019年第2期17卷 110-122页

作者： Yunpeng Jiang Lee Li Ming Lu Rumeng Wang Yiwen Jiang Shanfeng Liu Chao Su State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan 430074 China State Grid Henan Electric Power Research Institute Zhengzhou 450052 China Qingyuan Power Supply Bureau of Guangdong Power Grid Corporation Guangdong 511515 China

Insulators on high-voltage Uansmission lines are almost the only man-made structures on the Earth's surface intended for long-term operation under strong electric fields. After samples of natural contaminant particles were collected from insulator surfaces in China, it was found that the particle diameter distribution (PDD) was mainly concentrated in the 5-50 μm range. To analyze the statistical characteristics of these particles, this work studies the physical processes of particle collision and adhesion using the theories of hydrodynamics and collision dynamics. The physical model considers coupling of the fluid field and the electric field, introduces an adhesion criterion, and establishes a particle and surface collision model. The effects of relative humidity, wind speed, aerodynamic shape, electric field type, and electric field strength on particle adhesion were analyzed. The results show that the relative humidity and wind speed have very significant effects and the influences of the electric field type and the electric field strength are obvious, but the in fluence of the aerodynamic shape is relatively weak. The simulation results support the statistical characteristics determined in this work. The physical model established here provides reference values for study of the adhesion characteristics of particles on surfaces under electric fields.

关键词： Contaminant particle Collision Adhesion Particle diameter Simulation analysis

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A Broadband Hybrid Blue Energy Nanogenerator for smart Ocean Iot Network

SSRN

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SSRN 2024年

作者： Gao, Lingxiao Xu, Xinyu Han, Hongwei Yang, Weihong Zhuo, Ran Wei, Qiang Deng, Qibo Hu, Ning School of Mechanical Engineering Hebei University of Technology Tianjin300401 China School of Electrical Engineering Hebei University of Technology Tianjin300401 China Electric Power Research Institute China Southern Power Grid Company Ltd. Guangzhou510080 China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology School of Mechanical Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin300401 China Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education Hebei University of Technology Tianjin300401 China Advanced Equipment Research Institute Co Ltd. of HEBUT Tianjin300401 China

Blue energy is a crucial renewable-energy resource;however, its development has been limited by the low and variable frequency characteristics of sea waves. Herein, a spring pendulum coupled hybrid energy harvester (SPC-HEH), which includes two electromagnetic generators (EMG), two piezoelectric nanogenerators (PENGs), and two multilayer‐structured triboelectric nanogenerators (TENGs), was integrated into a vessel for efficient wave energy harvesting. The integration of the lightweight PENG and TENG with the heavy EMG not only enhanced the water wave energy harvesting capability of SPC-HEH but also optimized its spatial utilization efficiency. Additionally, the SPC-HEH was capable of simultaneously harnessing the kinetic energy and gravitational potential energy of water waves, owing to its utilization of the dual degrees of swing freedom offered by the spring pendulum. Importantly, owing to its precise geometric design and efficient space utilization, the SPC-HEH achieves an impressive peak power density of 82.4 W m-3. Finally, the SPC-HEH with a circuit was used as a self-powered ocean buoy to monitor ocean temperature, wave frequency, ocean turbidity and other information in real time. The application potential of this system in the domain of self-powered smart ocean IoT network is promising. © 2024, The Authors. All rights reserved.

关键词： Kinetics

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Design of real-time message synchronization cross smart grid dispatching system 4

Design of real-time message synchronization cross smart grid...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Xu, Chunlei Liu, Tong Lei, Baolong Peng, Hui State Grid Jiangsu Electric Power Co. Ltd. Nanjing China NARI Technology Co. Ltd. Xi'an China NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728196060

In the integrated operation mode of the smart grid dispatching and control system, there is a large amount of real-time data such as important alarms and manual operations that need to be shared between systems. How to synchronize these real-time data across systems with high reliability and performance becomes a problem to be solved. This paper studies the application scenarios of cross-system message synchronization and proposes a scheme based on redundant dual networks, including hardware and software architecture. The key technologies and important functions were implemented, reliability and throughput verifications were performed, and the expected results were achieved. © 2020 IEEE.

关键词： smart power grids

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The Influence of down Conductor Torsion on the Mechanical Properties of the Main Transformer End of Substation 7

The Influence of down Conductor Torsion on the Mechanical Pr...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Xie, Kai Tao, Yaguang Wang, Jinyang Huo, Xiangyu Liu, Zhuli Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan China School of Mechanical and Power Engineering Zhengzhou University Henan China

ISBN: (纸本)9781728155111

Four-bundle down conductor is prone to additional torsion in the installation process of it, which may affect the safety and stability of the end of bushing. In this paper, the down conductor of the main transformer bushing is taken as the research object, and ABAQUS as the platform. A fined finite element model is established to analyze the mechanical influence of the twisting method and twisting angle of the down conductor on the end of main transformer bushing. The results suggest that the stress of the bushing terminal and the terminal board increases non-linearly with the increase of the down conductor around its centerline or overall torsion;When the torsion angle is greater than 5°, the stress of the parts increases greatly, and the torsion angle should be controlled. The results of this paper lay the foundation for further optimizing the installation method of the main transformer bushing and improving the installation accuracy during the construction installation process. © 2020 IEEE.

关键词： Torsional stress

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Defect Diagnosis Method of Main Transformer Based on Operation and Maintenance Text Mining 7

Defect Diagnosis Method of Main Transformer Based on Operati...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Zhang, Yubo Wang, Youyuan Gu, Hongrui Liu, Lifeng Zhang, Jianguang Lin, Haifeng State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China Zhejiang Power Grid Co. Ltd. Shaoxing Power Supply Company Shaoxing China

ISBN: (纸本)9781728155111

During the operation and maintenance of electrical equipment like power transformers, the information of defects or faults are usually recorded by data. However, the method of classifying transformer defects by data relies on manual at present, which is inefficient and uneconomical. This paper presents a recurrent convolutional neural network with Bayesian optimization, which construct a classification model can automatically classify the power data. Firstly, the is preprocessed, including the establishment of the transformer's dictionary, word segmentation of defect and then mapping the results to word vectors based on distributed representation. Furthermore, training the CNN and RCNN networks by supervised learning. It is worth mentioning that in RCNN network, the Bi-LSTM structure is used instead of the convolutional layer, which can learn the semantics of the more effectively. In addition, in order to obtaining a better classification effect after training, the Bayesian method is used to optimize the hyper-parameters of the networks. Finally, On the test dataset, two kinds of network achieved 90% test accuracy and 92% test accuracy, respectively. © 2020 IEEE.

关键词： Defects

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The Influence of Wind Load on the Mechanical Properties of the Main Transformer Bushing End of UHV Substation 7

The Influence of Wind Load on the Mechanical Properties of t...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Si, Xuezhen Wang, Jinyang Xie, Kai Tao, Yaguang Liu, Zhuli Ren, Pengliang Yang, Xiaohui Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan China School of Mechanical and Power Engineering Zhengzhou University Henan China

ISBN: (纸本)9781728155111

The main transformer of substation mostly works in the wild, and its bushing end is prone to deformation and fracture. This paper takes ABAQUS as the platform and a bushing end of main transformer as the research object to establish a fine finite model. And the effect of wind load on mechanical properties of the bushing end was studied by taking wind speed and direction of dangerous condition as parameters. The results show that the terminal board and the bushing terminal are the weak links of structure, with large stresses and displacements. And the end cover is warped under the compression of the bushing terminal. The research results provide a reference for the structure's design, optimization and local strengthening measure of bushing ends and substations. © 2020 IEEE.

关键词： Bushings

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state Evaluation of Superconducting Current Limiters Based on Fuzzy Layered Method

State Evaluation of Superconducting Current Limiters Based o...

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2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Hei, Yingdun Zhou, Xingmei Tan, Yaxiong Pan, Jiajun Tian, Chuyu Chen, Wei Yunnan Electric Power Research Institute Yunnan Power Grid Co. Ltd Kunming China State Key Laboratory of Power Transmission Equipment System Security New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728191645

The superconducting current limiter is a key electrical equipment to limit fault current in power system, which can quickly limit short-circuit current in the event of a short-circuit fault. The coordinated matching operation of the superconducting DC current limiter and the high-voltage DC circuit breaker solves the problem that the DC side fault is difficult to clear quickly, and promotes the development of the future multi-terminal DC transmission system and DC networking technology. This paper presents indicators selection and weight calculation for condition evaluation of superconducting fault current limiter. Superconducting fault current limiter theory and structure are given to introduce the current limiter. Then condition monitoring of superconducting fault current limiter was analyzed, which involving state, operating, control parameters. Condition evaluation system of superconducting fault current limiter is obtained, according to condition evaluation principle. Weights of the condition indicators are calculated by improved analytic hierarchy process approach. Also the condition evaluation approach based on fuzzy theory is presented. The proposed approach is of great significance to the operation of the superconducting fault current limiter. © 2020 IEEE.

关键词： Superconducting fault current limiters

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Research on technology of Ice Melting with Load Based on Dual SVG Flow Control

Research on Technology of Ice Melting with Load Based on Dua...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Qingjun Huang Yuan Zhu Xiudong Zhou Lan Zhang Xinguo Mao Siguo Zhu State Key Laboratory of Prevention & Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Corporation Limited Disaster Prevention & Reduction Center Changsha China State Grid Hunan Electric Power Corporation Limited Changsha China Hunan Disaster Prevention Technology Corporation Limited Changsha China State Grid Hunan Electric Power Corporation Limited Disaster Prevention & Reduction Center Changsha China

ISBN: (纸本)9781665434263

Line icing can easily cause towers down and lines broken, which seriously threatens the safe operation of the power grid and power supply. Current ice melting is an economical and efficient means to deal with line icing. But the existing engineering application of ice melting technology is required line outages, which is greatly affected to the power grid. In order to realize the ice melting without power outages, a method of ice melting with load based on dual SVG flow control is proposed. power flow controlling can increase the line current to achieve the purpose of line ice melting. Finally the aim of ice melting with load is realized. The feasibility of the scheme is verified by calculation and simulation of dual SVG flow control for 10kV lines.

关键词： power supplies Poles and towers System integration Ice power grids power system reliability Internet

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