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2019 4th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2019

作者： Xiao, Xiaoming Hu, Weinan Ran, Jun Xu, Zheng Hei, Guoyu Han, Xintong Zhao, Lipeng State Grid Chongqing Wanzhou Power Supply Company Wanzhou Chongqing404160 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China Chongqing Three-Gorges Water Conservation and Electric Power School Wanzhou Chongqing404160 China

Corona discharge on high-voltage transmission lines is a common phenomenon in power systems. It results from poor contact between insulators and lines, and broken strands on transmission lines. Long-term corona discharges may lead to more serious power grids accidents. Hence, it is of great importance to effectively detect the occurrence of corona discharge. The Hilbert Fractal Antenna is a wide-band, small-sized antenna which can be carried by the unmanned aerial vehicle for close-range detection and accurately position fault points of corona discharge. In this paper, the finite element method is used to study the 5th order Hilbert fractal antenna. The research focuses on the different feeding positions of the antenna. By studying the different feeding positions of the antenna, we determine a miniaturized antenna which can be used for corona discharge detection of high-voltage transmission lines. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Fractals

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Reliability and Safety Assessment of Distribution Networks in Mountainous Plateau Areas Subject to Low-amplitude Lightning

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Reliability Engineering & System Safety 2025年

作者： Yutao Tang Kai He Hongchun Shu Ke Wang Weijie Lou Zhong Qin Yiming Han Yue Dai State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly (Kunming University of Science and Technology) Kunming 650500 China Faculty of Electric power Engineering Kunming University of Science and Technology Kunming 650500 China Electric Power Research Institute of Yunnan Power Grid Kunming 650217 China

Lightning poses a primary threat to the safety and reliability of power systems, especially distribution networks are susceptible to lightning-related accidents due to their weaker protective capabilities. In plateau and mountainous regions, distribution lines are particularly affected by Low-amplitude Lightning (LaL) due to the shielding and attracting effects of mountains and the earth. Analyzing and assessing the overvoltage risks posed by LaL to distribution lines holds significant practical value. This paper develops a risk assessment model for distribution lines in plateau and mountainous regions, firstly, driven by actual lightning data collected by the High Precision Lightning Location System (HPLLS), found that the LaL events exhibited a notably high occurrence frequency of 46.02%. Secondly, a fractal streamlines model (FSM) for simulating the development of lightning leaders is proposed. Finally, based on the FSM, the probability and spatial distribution of LaL direct strikes are calculated, within the lightning strike range, the probability of LaL directly hitting distribution lines was close to 100%, the overvoltage caused by LaL can reach hundreds of kV, and a risk-based LaL damage assessment model is presented. This integrated methodology advances lightning risk assessment practices, providing a physics-informed foundation for enhancing the reliability of mountainous distribution networks.

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Simulation Analysis of the Influence of Harmonics Current on the Winding Temperature Distribution of Converter Transformer

Simulation Analysis of the Influence of Harmonics Current on...

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power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Jie Zhang Lin Cheng Hao Wen Cong Liu Jian Hao Zhiwei Li NARI Group Corporation/State Grid Electric Power Research Institute Nanjing China State Grid Electric Power Research Institute Wuhan NARI Co. Ltd. Wuhan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Baoding Tianwei Baobian Electrical Limited Company Baoding China

The converter transformer is directly connected to the main non sinusoidal power receiving equipment of the power network, the converter valve, which has a large harmonic content. The temperature rise is an important index to reflect the internal state and safe transmission capacity of converter transformer, so the influence of harmonics on the temperature rise of converter transformer winding is worthy of attention. Taking the actual converter transformer as an example, the magnetic field simulation model and heat flow simulation model of the converter transformer are established, and the variation of winding loss and winding temperature distribution under different harmonic content and harmonic frequency are simulated and studied. It is found that when the harmonic content increases, the harmonic current of the winding increases, so the resistance loss of the winding increases, and the hot spot temperature rise of the winding increases in a power function with the harmonic content; when the harmonic content increases, the equivalent resistance of the winding increases, so the resistance loss of the winding increases, and the hot spot temperature rise of the winding increases in an exponential function with the harmonic frequency. Finally, the quantitative relationship of winding temperature rise under different harmonic content and harmonic frequency is obtained.

关键词： Resistance Heating systems Analytical models Temperature distribution Windings power system harmonics Harmonic analysis

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Non-interactive K -mode clustering of high-dimensional categorical data under local differential privacy

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Information Sciences 2025年 718卷

作者： Xinxin Ye Youwen Zhu Shunsheng Zhang Hai Deng Pengfei Yu Colledge of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 211106 Jiangsu China Key Laboratory of Data Protection and Intelligent Management Ministry of Education Sichuan University Chengdu 610065 China State Grid Laboratory of Power Cyber-Security Protection and Monitoring Technology State Grid Smart Grid Research Institute Co. LTD. Nanjing 210003 Jiangsu China

High-dimensional categorical data contains rich user-sensitive information, which poses huge privacy threats to users once leaked during data clustering and analysis. The existing K -mode method under local differential privacy (LDP) always requires multiple user-server interactions, which not only has high communication overhead and computational cost but also makes user privacy vulnerable to malicious attacks during interactions. In this paper, we propose a non-interactive LDP K -mode clustering estimation method for high-dimensional categorical data. We first perform dimensionality reduction on each user data locally through the Fsketch algorithm. Then, we perturb the sketch data, ensuring the perturbation satisfies LDP. The perturbed data is then submitted to the server for K -mode clustering. Finally, on the server, we directly estimate the Hamming distance on the perturbed data to achieve K -mode clustering analysis. It is theoretically proven that our perturbation method satisfies LDP and is unbiased. Compared with state-of-the-art methods, our scheme more accurately estimates the Hamming distance between high-dimensional categorical data, reducing communication overhead due to only one interaction. Extensive experiments demonstrate the effectiveness of our method on four real high-dimensional category data sets, in which our scheme has a smaller normalized intra-cluster variance and larger purity index under the same privacy budget.

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Experimental Study on Flashover Performance of Hot Sticks under Switching Impulses

Experimental Study on Flashover Performance of Hot Sticks un...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Xiangen Zhao Juhyeong Lee Lei Liu Bangxin Sun Li Tang Junjia He State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Utah State University Logan United States State Key Laboratory of HVDC Transmission Technology China Southern Power Grid Guangzhou China EHV Power Transmission Company China Southern Power Grid Guangzhou China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

The hot stick is commonly used in live-line work, and its flashover performance is one of the critical issues since this is related to the worker safety. However, several critical parameters during the flashover are not well understood. To do this, an experimental platform was established for the flashover performance study, with which the applied voltage, discharge current and high-speed frames were recorded simultaneously. Experiments on a 6-m hot stick were carried out under switching impulses with different polarities and magnitudes. Deviations of breakdown voltage are analyzed first. The characteristics of leader development under positive and negative impulses are then compared according to the corresponding current waveforms and high-speed frames. Judging from the number, location and span of leader channel jumps, eight types of discharge path are classified, and the effect of impulse polarity and amplitude are analyzed. For both positive and negative flashovers, significant ablation damage zones were observed in the ground terminal of the hot stick.

关键词： Discharges (electric) Flashover Metals Switches Fault location Tools Current measurement

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A Blockchain-based Protocol for power Data Preservation in Ping Dingshan vs. Wang Case

A Blockchain-based Protocol for Power Data Preservation in P...

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IEEE International Conference on Electronics and Communication Engineering (ICECE)

作者： Huinan Wang Yang Feng Bin Xing Xin Zhang Zhao Wang Jiaxing Wu Xin Huang Metering Center of Shanxi Electric Power Company China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Smart-Chip Microelectronics Technology Co. Ltd. China Taiyuan University of Technology China

ISBN: (纸本)9781728188577

power companies, the data collected by smart meters on electricity consumption is of vital interest. In 2019, Wang had a dispute with Ping Dingshan. They came into disagreement regarding the amount of electricity consumed, which was a difference of 1334 kWh. It was not settled until 2021. To avoid the above problem, smart meters could upload power information to the blockchain. In this paper, we improved the authentication protocol key proposed by Zhang and proposed a new scheme for uploading the power information from smart electricity meters, which ensures the integrity, confidentiality and authentication of the power information. At the same time, the proposed scheme is unbalanced for the computing capability of both communication parties, and can effectively reduce the burden of the server.

关键词： Meters Protocols Conferences Authentication Companies smart meters Real-time systems

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High voltage dielectric response characteristics of oil-paper insulation with different moisture content

High voltage dielectric response characteristics of oil-pape...

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： Z. Jian J. Hao X. Shen Q. Liu Y. Shang Y. Liang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing People's Republic of China State Grid Shaanxi Electric Power CO. Shaanxi Electric Power Research Institute Xi'an People's Republic of China

power transformer is the key equipment in power system. Frequency dielectric spectroscopy (FDS) is widely used in moisture content measurement for oil-paper insulation used in transformer. But at present, FDS test voltage used in the field and laboratory is low, the response signal is weak and vulnerable to be interferenced, so it is unable to accurately detect and evaluate the insulation state of large power transformer. Therefore, it is of great significance to carry out frequency dielectric response test and analysis under high voltage. In this paper, the frequency dielectric response of oil-paper insulation under high voltage is tested firstly. The influence of different excitation voltage and moisture content on the FDS of oil-paper insulation is studied, and the dielectric characteristic quantity which can characterize the moisture content of oil-paper insulation is extracted. The results show that increasing the excitation voltage can effectively suppress the noise interference on the response signal. The relationship between dielectric loss factor and moisture content of oil-paper insulation is linear. With the increase of excitation voltage, the fitting line of dielectric loss factor and moisture content moves up, while the slope of the line is almost constant.

关键词： dielectric losses moisture moisture measurement paper permittivity power transformer insulation power transformers transformer oil

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Analysis of lightning protection performance of 110 kV transmission line canceling lightning wire

Analysis of lightning protection performance of 110 kV trans...

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： J. Hu R. Zhang F. Zhen X. Wang K. Sun X. Jiang Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Corporation Changsha People's Republic of China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing People's Republic of China

The 110 kV transmission line is an essential part of high-voltage transmission lines. However, some 110 kV lines have severe icing problems and plan to use the mode of operation without the lightning wire. In this paper, the ATP software simulates the transmission line with the lightning wire canceled. Then the lightning withstanding level of the line after the lightning wire is canceled is studied. The simulation obtains the lightning withstanding level under different grounding resistance of the tower. The results show that the lightning withstanding level of the transmission line after the lightning wire is canceled lower than that of the standard transmission line. Based on the simulation results, this paper proposes using the anti-lightning and antiicing composite insulator to improve the lightning protection performance of transmission line without the lightning wire. Through simulation calculations, it finds that the lightning withstanding level of the transmission line has been dramatically improved after applying the anti-lightning and anti-icing composite insulator. It indicates that installing the anti-lightning and anti-icing composite insulator is a feasible solution on the transmission line without lightning wire.

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Reactive power Optimization In Distribution Networks With High Penetration Of Renewable Energy Based On Second-Order Cone Programming

Reactive Power Optimization In Distribution Networks With Hi...

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

作者： Xin Pan Ming Wen Shuyang Pan Kai Liu Mengdi Dai Lingyu Chen State Grid Hunan Electric Power Company Limited Economic and Technical Research Institute Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha China State Grid Hunan Electric Power Co. Ltd. Changsha power supply company Changsha China Beijing State Grid prehv Transmission Technology Co. Ltd Beijing China School of Electrical Engineering and Automation Wuhan University Wuhan Chian

ISBN: (纸本)9781665434263

With the reduction of fossil energy, new energy power generation has become a new trend and is becoming more and more popular. Although it can effectively alleviate the resource problems of the grid, at the same time due to its own randomness and volatility, it will bring instability problems such as voltage flicker to the grid. Therefore, after new energy is connected to the grid, how to coordinate with the grid to respond to situations such as new energy fluctuations and load fluctuations, and participate in reactive power optimization together, is a problem worthy of study. In this paper, experiments are carried out on IEEE33 examples. Select static var compensator and doubly-fed wind generator as reactive power regulation equipment, take minimum network loss and minimum voltage offset as the comprehensive objective function. The power optimization problem is solved under the requirements of voltage and current constraints, power flow constraints, and equipment operation reactive power constraints. This paper introduces a second-order cone optimization method to convert the original power flow model into a second-order cone programming problem. This article divides four scenarios according to the equipment access and the different goals to carry out the test respectively. Through the comparison of the network loss and the voltage deviation, it is proved that the new energy can promote the reactive power optimization after the it is connected to the grid, and the second-order cone programming algorithm is verified its effectiveness and superiority in the reactive power optimization.

关键词： Reactive power Fluctuations Voltage fluctuations Distribution networks Programming Wind power generation Voltage control

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A Security Reinforcement Model for Edge Computing Facilities in 5G power Network

A Security Reinforcement Model for Edge Computing Facilities...

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第五届无线通信与应用国际会议

作者： Nige Li Peng Zhou Zhipeng Shao Xiaoxiao Chen Power Grid Digitizing Technology Department State Grid Smart Grid Research Institute Co. Ltd. State Grid Key Laboratory of Information and Network Security State Grid Zhejiang Electric Power Corporation Information and Telecommunication Branch

5G network has attracted much attention from the vertical industry since its commercial use. Compared with previous generations of mobile communication technologies, 5G bandwidth, delay and other communication KPI indicators have been greatly improved. 5G network has three typical application scenarios of large bandwidth, low delay and wide connection. In the power grid scenario, it can meet the needs of various power grid business access. As the key technology to realize 5G, multi-access edge computing(MEC) plays an important role in high-speed and low delay wireless data transmission network and has made indelible contributions to improving end-to-end service quality. In view of today's increasingly complex network security environment and changing attack means,security attacks against MEC systems and applications have become endless. In order to deal with large-scale and various attacks, this paper studies the micro application security reinforcement and independent application security reinforcement technology deployed in edge computing facilities in the environment of 5G power network, proposes the security reinforcement model of MEC, and strengthens the source code of edge computing facilities based on the so file confusion technology of OLLVM, so as to ensure the safe and stable operation of MEC.

关键词： Mobile edge computing Micro application security reinforcement Independent application security reinforcement

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