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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Quda Tashi Song Yue Bujie Duo Lei Gao Deji Tenzin Liugang Li Fan Yang State Grid Tibet Electric Power Company Limited. Tibet Electric Power Research Institute Lhasa China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781665425513;9781665430791

The electromagnetic environment of DC transmission lines has become the main restrictive factor for the design and operation. In order to further study the electromagnetic environment distribution in high altitude areas, this paper analyzes the ground-level composite field strength, Radio interference and audible noises of different lines which is the ±400kV Qaidam-Lhasa DC transmission project at altitudes over 4500m. Based on the measured data, the distribution law of the electromagnetic environment under the line was analyzed, and the changes of the electromagnetic environment with the increase of altitude were studied. The results show that the composite field strength, radio interference, and audible noise under the line are all within the standard limits, and with the increase of altitude, the overall trend is increasing. The research results can provide evaluation basic for electromagnetic environment problems in high-altitude DC transmission projects.

关键词： power transmission lines Acoustic noise Electromagnetic interference Wires Energy measurement Attenuation measurement transmission line measurements

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Service restoration strategy of active distribution network based on power router 4

Service restoration strategy of active distribution network ...

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

作者： Bai, Xuefeng Xi, Wei Yao, Hao Chen, Wei Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Electric Power Research Institute of China Southern Power Grid Company Limited Guangzhou China

ISBN: (纸本)9781728196060

The power router (PR) based on power electronics technology can flexibly control the power flow, coordinate the power transmission among AC power, distributed generator (DG), distributed energy storage device (DS) and load, and also replaces the traditional tie switch, so it will play a significant role in the service restoration stage of the distribution network. This paper proposes a service restoration strategy considering frequency stability for active distribution network based on PR. Firstly, considering the fuel reserve limitation of DG and residual energy limitation of DS, the objective of service restoration is proposed to ensure the continuous power supply of as many high of priority loads as possible. Then, considering the time-varying characteristics of photovoltaic power generation, wind power generation and load, a service restoration strategy, which can balance the active power and stabilize the frequency, is proposed to ensure the power supply quality in the fault recovery stage. Finally, a system with a PR managing DG, DS and local load is utilized to demonstrate the effectiveness of the proposed method. © 2020 IEEE.

关键词： Restoration

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Study on breakdown characteristics of combined air gap with floating conductors under positive and negative lightning impulse voltage 16

Study on breakdown characteristics of combined air gap with ...

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16th IET International Conference on AC and DC power transmission, ACDC 2020

作者： Shao, Tianying Mei, Hongwei Lu, Ming Gao, Chao Zhang, Shiyao Wu, Dengjin Yin, Fanghui Wang, Liming Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9781839533914

To understand the breakdown process of combined air gap, experiments of rod-plane gap with floating conductors under positive and negative lightning impulse voltage were conducted. During the test, the diameter and position of the conductor were changed. From the experiment, the 50% sparkover probability voltages were obtained. The discharge processes and breakdown paths were recorded by the optical observation system composed of a high-speed camera and a mirror. The test results show that the floating conductor's function is strongly related to the voltage polarity. Under positive voltage, large diameter floating conductor inserted into the gap could lead to bypassing phenomenon and increase breakdown voltage. However, under negative impulse voltage, the discharge channels all pass through the floating conductor and the breakdown voltage is significantly reduced. Based on the electric field simulation, the above experimental phenomena are preliminary analysed. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Electric breakdown

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Design and implementation of lightweight manmachine terminal screen interactive client 4

Design and implementation of lightweight manmachine terminal...

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

作者： Lv, Zhimeng Que, Lingyan Fang, Caishen Wang, Xingzhi He, Yuan Huang, Kun NARI Group Corporation State Grid Electric Power Research Institute NARI Technology Co. Ltd. Nanjing China State Grid Zhejiang Electric Power Co. Ltd. No.8 of Huanglong Road Xihu District Hangzhou China East-China Branch of State Grid Co. Ltd. No. 201 Nanjing East Road Huangpu District Shanghai China NARI Group Corporation State Grid Electric Power Research Institute National Key Laboratory of Smart Grid Protection and Operation Control NARI Technology Co. Ltd. Nanjing China

ISBN: (纸本)9781728196060

According to the characteristics of the 'physical distribution and logical integration' of the new generation dispatching automation system, this paper designs a lightweight human-machine terminal display architecture. It also proposes the componentization of the screen and its rendering technology to realize the display of electrical primitives, chart primitives, and non-viewable primitives on lightweight man-machine terminals. Besides, this paper proposes the GIS visual display technology to meet the needs of geographic information display in the dispatch automation system and put forward the interaction technology of picture linkage to improve the interaction flexibility of picture components. Relevant research results have developed prototype system and applied in the field pilot. © 2020 IEEE.

关键词： Automation

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Best practices in China Southern power grid competition of AI short-term load forecasting 12

Best practices in China Southern Power Grid competition of A...

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12th IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2020

作者： Lu, Jixiang Qian, Junxia Zhang, Qipei Liu, Shaobo Xie, Feng Xu, Hongsheng State Key Laboratory of Smart Power Grid Protection and Control Nanjing China Jiangsu Keneng Electric Power Engineering Consultant Co. Ltd Nanjing China Technology Research Center Nari Group Corporation Nanjing China

ISBN: (纸本)9781728157481

China Southern power grid (CSG) hosted a competition of AI short-term load forecasting with real-world load data in Sept 2019. NARI technology was invited for the 10 days closed match and got the 2nd prize among 28 top players in China, such as research institutes, universities, and system suppliers. This paper highlights the best practices we did in the competition: feature selection of short-term load forecasting, outlier data preprocessing for both load data and meteorological data, multiple head long short term memory (LSTM) neural network innovation and data augmentation with the benchmark. opportunities for improvements are considered as well. © 2020 IEEE.

关键词： Long short-term memory

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Experimental and simulation analysis of the influence of moisture on dielectric and breakdown properties of insulation pressboard used in power transformer 3

Experimental and simulation analysis of the influence of moi...

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2020 3rd International Conference on Mechatronics and Computer technology Engineering, MCTE 2020

作者： Wen, Hao Cheng, Lin Jiang, Yi Zhao, Zhigang Ye, Wenyu Hao, Jian Nanjing Nari Group Corp. State Grid Electric Power Research Institute Nanjing Jiangsu211000 China Wuhan Nari Co Ltd. State Grid Electric Power Research Institute Wuhan Hubei430074 China China Electric Power Research Institute Beijing100192 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

The influence of water molecules on cellulose has attracted much attention. The influence of water molecules on the dielectric property and breakdown property of cellulose requires in-depth research. In this paper, firstly, the effect of water on the dielectric spectrum in the frequency domain dielectric spectrum and the breakdown voltage of cellulose were studied. Then the parameters such as free volume, hydrogen bond, energy level and state density of cellulose under different moisture content were analysed by molecular simulation. The changes of dielectric properties and breakdown properties of cellulose under different water content were studied and summarized. The variation mechanism of dielectric property and breakdown property of different moisture content was explained by molecular simulation. © Published under licence by IOP Publishing Ltd.

关键词： Cellulose

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Humidity effects on the ground-level resultant electric field of positive DC conductors

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Plasma Science and technology 2019年第7期21卷 6-15页

作者： Haibing LI Jie ZHU Wei YANG Xu ZHANG Donglai WANG Junyu ZHU Xingming BIAN State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People’s Republic of China State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research InstituteBeijing 102211People’s Republic of China State Grid Suzhou Electric Power Supply Company Suzhou 215008People’s Republic of China

The effects of humidity on the ground-level resultant electric field around positive DC conductors were studied both experimentally and numerically. Experiments were carried out in an artificial climate chamber, the results of which showed that the photon count and the groundlevel resultant electric field strength both increased with increasing relative humidity. Numerical calculations for different values of relative humidity were carried out, including solutions of the positive corona inception voltage and the ion-flow field, for which a photoionization model and the upstream finite element method were employed, respectively. In order to analyze the effects of humidity, three main factors were considered: the ionization coefficient, the attachment coefficient in the photoionization model and the modified ion mobility of the charged water particles. The results indicated that, with increasing relative humidity, increasing values of the effective ionization coefficient were responsible for a reduction in the inception voltage, and the reduction reinforced the ground-level resultant electric field. Moreover, due to the charged water particles and the lower ion mobility with increasing relative humidity, the space charge density distribution was enhanced, which also strengthened the ground-level resultant electric field.

关键词： corona discharge humidity electric field

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Three-Dimensional Numerical Simulation of Rime Ice Accumulation on Silicone Rubber Insulator and its Experimental Verification in the Natural Environment

SSRN

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SSRN 2022年

作者： Liu, Zongyuan Hu, Yuyao Jiang, Xingliang Wu, Ying Chi, Mingchen Han, Feiyan Wang, Xiaolei College of Electrical and Electronic Engineering Shandong University of Technology Zhangdian District Zibo255000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba District Chongqing400044 China State Grid Weifang Hanting Electric Power Company Hanting District Weifang261100 China Shandong Huineng Electric Co. Ltd. Zibo255089 China

Icing on transmission lines is a challenging problem in the world. Rime icing on silicone rubber insulator was taken as research object in this paper. Based on the theories of computational fluid dynamics and collision dynamics, the position coordinates of supercooled water droplets collided with the surface of the insulator were extracted, the local collision coefficient (E) of the droplet was calculated by triangular area ratio method. The effectiveness of the method was verified by actual rime icing distribution. An ice shape reconstruction algorithm was proposed to realize three-dimensional numerical simulation of rime ice accretion on the insulator. Results show that E is the largest at the edge of the shed facing the flow direction, reaching 0.79. The median volume diameter of water droplet (MVD) has a greater impact on the E than wind speed (v). The length, thickness and amount of rime icing on the insulator calculated by the model increases with time, whose errors with that obtained by the tests are less than 12.82%, 15.78% and 14.07%, respectively. Moreover, the simulated icing distribution is well consistent with the experimental results. Therefore, the effectiveness of the numerical simulation method was proved in the present research. © 2022, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Electro-impulse de-icing (EIDI) test of aircraft wing leading edge

Electro-impulse de-icing (EIDI) test of aircraft wing leadin...

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

作者： X. Jiang Y. Chen T. Huang M. Wang H. Huang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China Electric Power Science Research Institute of Guizhou Power Grid Co. Ltd Guiyang550000 China

The aircraft electro-impulse de-icing (EIDI) technology is a kind of mechanical de-icing system, which has a good application prospect. In this paper, the planar coil is wound, the discharge circuit is built, and the parameters of the discharge circuit are calculated. The EIDI model of planar aluminium plate is established. The pulse current of the coil and the electromagnetic pulse force of the leading edge are calculated by simulation. The effects of coil turns, pulse voltage and gap on the pulse action are analysed. According to the drawings of the leading edge of the aircraft, the author made the wing skin with the 6061 aluminium plate of 1.5 mm thickness, fixed the self-made coil in the skin, completed the de-icing test in the artificial climate chamber, and preliminarily verified the feasibility of the electro-impulse de-icing scheme of the leading edge of the wing.

关键词： aerospace components aircraft testing aluminium aluminium alloys coils electromagnetic pulse plates (structures) de-icing

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Experimental study on enhancing the foam spray range of compressed air foam nozzle

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Journal of Safety Science and Resilience 2025年第3期6卷

作者： Fengju Shang Jiaqing Zhang Xin Liu Yi Guo Yunpeng Yang Lilong Nie Kaiyuan Li State Grid Anhui Electric Power Research Institute Anhui Province Key Laboratory of Electric Fire and Safety Protection (State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities) Hefei 230601 China School of Safety Science and Emergency Management Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China

As the core equipment in power systems, ultra-high voltage (UHV) transformers pose a high fire risk. The compressed-air foam spray nozzle is a novel end-release device that, due to its high efficiency and excellent suppression effect on oil-based fires, has been increasingly applied in UHV substations. This study is based on a self-developed experimental platform for compressed-air foam firefighting systems. To meet practical engineering needs, the longitudinal maximum of the contour line at the threshold of 12 L/(min·m²) was selected as the spray range. The study systematically explored the factors influencing the spray range of the spray nozzle. Experimental results revealed that when the hole elevation angle was 60°, the average spray range increased by 59 % compared to 0°. When the nozzle aperture was 10 mm and the outlet pressure was 0.15 MPa, the spray range improved by 17 %. Additionally, as the outlet pressure increased, the foam spray range grew significantly, with a 35.2 % increase at 0.3 MPa compared to 0.1 MPa, indicating that the outlet pressure had a substantial effect on the spray range. To predict the spray range increase, an empirical model is developed for the outlet pressure versus the spray range. After analyzing the above three influencing factors, all the data of various working conditions were integrated into a single dataset, a prediction model of the spray range was established, and the importance of the factors affecting the range was ranked. These findings provide a theoretical foundation for the optimized design and engineering application of compressed-air foam systems (CAFSs).

关键词： Compressed-air foam system (CAFS) Spray elevation angle Spray nozzle aperture Spray outlet pressure Spray range

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