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检索条件"机构=State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid"

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Single-phase Grounding Fault Line Selection Method Based on the Difference of Electric Energy Information Between the Distribution End and the Load End

Single-phase Grounding Fault Line Selection Method Based on ...

引用

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

作者： Gang Liu Kun Liu Bing Ai Jian Tan Jie Wu Jian Hao State Grid Sichuan Electric Power Corporation Metering Canter Chengdu China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

This paper constructs a 110kv distribution network simulation model to simulate and analyze the changes of electrical energy information at various locations after single-phase grounding short-circuit faults occur on different lines of the distribution network. The results show that: when a single-phase grounding short circuit occurs in the distribution network, the power on the bus will definitely undergo a sudden change. When the bus fails, the power on line 1 and line 2 does not change much; when line 1 or line 2 fails, the power at the delivery end of the faulty line changes suddenly. The power on the load side of the faulty line and the normal line does not change much. When the fault is eliminated, the sudden change of power will re-enter the steady state after oscillating attenuated. Based on the fault characteristics, a route selection method based on the change of power selection coefficient is proposed. The method is based on the existing electric energy information of the distribution network, no other equipment is required, and has high economic efficiency. At the same time, the method can monitor electric energy information online in real time and find faulty lines in time. This method has high accuracy of line selection.

关键词： Analytical models Grounding Distribution networks Real-time systems Steady-state Circuit faults Integrated circuit modeling

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Study on Lightning Intrusion Overvoltage of Traction Substation at High Altitude 7

Study on Lightning Intrusion Overvoltage of Traction Substat...

引用

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

作者： Zhou, Fangrong Wang, Xiaotian Ma, Yi Peng, Qingjun Ma, Yutang Yuan, Tao Electric Power Research Institute of Yunnan Power Grid Co. Ltd Yunnan China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Qinghai-Tibet Railway is located at high altitude areas, whose altitude ranges from 2828 meters to 5072 meters. The lightning impulse withstand levels of transmission lines in those areas is quite different due to the different altitudes, which leads to various wave shapes of overvoltage. Therefore, we intend to adopt a regulations method to modify the insulation strength of transmission lines at high altitudes. And the magnitudes of overvoltage on main electrical equipment at different altitudes and their changes with altitude were compared and analyzed. In this paper, firstly, the flashover voltage of the insulator string at different altitudes is modified, to obtain the 50% discharge voltage of the insulator string at different altitudes. Secondly, we established several numerical models of the arrester, tower, insulator string, lightning current, and equipment in the station. Observations and studies of lightning phenomena indicate that lightning has the phenomenon of multiple discharges in one breakdown process. Finally, the overvoltage of lightning intrusion waves at different altitudes and under different lightning impact waves was calculated respectively, and the law of lightning overvoltage of main equipment under different altitudes is obtained. © 2020 IEEE.

关键词： Electric lines

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F-P Ultrasonic Sensor Based on Three-Beam Support Cantilever Structure

F-P Ultrasonic Sensor Based on Three-Beam Support Cantilever...

引用

advanced Electrical Equipment and Reliable Operation (AEERO), International Conference on

作者： Kejie Wu Weigen Chen Zhixian Zhang Yuxuan Song Fan Liu Tianhe Yang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China State Grid Hubei Electric Power Research Institute Wuhan Hubei China

ISBN: (纸本)9781665402651

Based on the principle of F-P (Fabry-Perot) interference, this paper designs a three-beam support cantilever optical fiber F-P sensor. Three beam support cantilever structure improves the sensitivity of detecting GIS partial discharge, ensures the consistency of the insulation medium inside and outside the sensor, and eliminates the influence of temperature changes on the sensor. Based on COMSOL simulation, this paper analyzes the influence of the beam width on the resonance frequency and static pressure sensitivity of the three-beam support cantilever structure, and selects the optimal parameters to design a F-P sensor with a resonance frequency of 27033 Hz. Based on the optical detection platform, this paper uses Electric ignition to simulate partial discharge ultrasonic signals in the air. The measured resonance frequency of the sensor is 28077 Hz. The sensor can effectively detect the ultrasonic signal of partial discharge of GIS.

关键词： Partial discharges Temperature measurement Partial discharge measurement Sensitivity Ultrasonic variables measurement Resonant frequency Optical variables measurement

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Determining Feasible Region of Tie-line transmission Considering Converter Station

Determining Feasible Region of Tie-line Transmission Conside...

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Information Control, Electrical Engineering and Rail Transit (ICEERT), International Conference on

作者： Xuan Fan Lili Wen Caoyang Cheng Qian Zhou Li Fan Yuan Zhu Honhjie Yu Piao Du Xinxin Fang State Grid Chongqing Economic Research Institute Chongqing China State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China State Grid Chongqing Electric Power Company Chongqing China

power resources and demand in China are in opposite directions, leading to the requirements of tie-line power exchanges. A good characterization of the feasible region of tie-line transmission plays a vital role in improving the utilization efficiency of tie-line power exchanges. With the increase of converter stations in power systems, the feasible region of tie-line transmission considering converter stations is for the first time studied in this paper. A bi-level determination method is presented for the characterization. In the upper level, impacts of integer variables in converter stations are incorporated into the feasible region by exploring the critical combinations of integer variables that are associated with boundaries of the feasible region. In the lower level, the operational constraints with the found integer variables are projected to the domain of tie-line transmission by the existing algorithms. The effectiveness of the presented methods is demonstrated in a modified IEEE 5-bus test system.

关键词： Rails Electrical engineering Transformers

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Determining Feasible Region of Tie-line transmission Considering power Loss

Determining Feasible Region of Tie-line Transmission Conside...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Qian Zhou Xuan Fan Juelin Liu Lili Wen Fan Mu Gaofeng Yang Wen Jiang State Grid Chongqing Electric Power Company Chongqing China State Grid Chongqing Economic Research Institute Chongqing China State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China

power supply is geographically located in the opposite direction of power demand in China. Consequently, tie-line power exchanges in interconnected power grids are common. A good description of the feasible region of tie-line transmission can improve utilization efficiency of power resources. In this paper, one two-stage determination method for the feasible region of tie-line power transmission with power loss is presented. Furthermore, in order to reduce the number of optimization in our two-stage method, an acceleration strategy is further presented based on hot-start operation point. The validation and effectiveness of the presented methods are demonstrated in the IEEE 14-bus and IEEE 300-bus test systems.

关键词： Electrical engineering power demand Automation power transmission Propagation losses power grids Optimization

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Reliability analysis for commercial sic mosfets in single pulse and repetitive surge current test 11

Reliability analysis for commercial sic mosfets in single pu...

引用

11th International Conference on Prognostics and System Health Management, PHM-Jinan 2020

作者： Wu, Hao Jiang, Chunyan Guo, Qing Ren, Na Zhu, Zhengyun Wu, Bin Qi, Xiang Global Energy Interconnection Research Institute CO.LTD State Key Laboratory of Advanced Power Transmission Technology Beijing102209 China Zhejiang University Electrical Engineering Department Hangzhou China State Grid Taian Power Supply Company Taian China

ISBN: (纸本)9781728151816

SiC MOSFET Body diodes are expected to compete against SiC schottky barrier diodes (SBD) in high power applications. To investigate the surge capability of the body diodes in commercial SiC MOSFETs, single pulse and repetitive surge current tests are processed on the DUTs. In single pulse surge current test, the DUTs are stressed to failure. Compared with the body diodes in SiC trench-gate MOSFETs, the body diodes in SiC planar-gate MOSFETs tend to show better surge capability at all rated current levels. On the other hand, in repetitive surge current test, the degradation of electrical parameters is observed after hundreds of pulse cycles. The degradation mechanism of bipolar degradation and oxide layer degradation has been analyzed. © 2020 IEEE.

关键词： Silicon carbide

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Simulation of Partial Discharge of Oil-pressboard insulation with Needle-plate Model under Positive DC Voltage 7

Simulation of Partial Discharge of Oil-pressboard insulation...

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

作者： Zhang, Ziyue Liu, Hongshun Xue, Zhitong Abdo, Ali Mohammed Ali Li, Qingquan Jiang, Jianping Qu, Wentao Qiao, Mu Shandong Provincial Key Laboratory of Uhv Transmission Technology and Equipment Shandong University Jinan China Maintenance Company of State Grid Shandong Electric Power Co Jinan China

ISBN: (纸本)9781728155111

In the High Voltage Direct Current (HVDC) power transmission project, partial discharge (PD) inside the electrical equipment often leads to aging and even breakdown of insulation, which brings serious harm to electrical equipment. Therefore, it is necessary to study the PD mechanism of oil-pressboard insulation under direct current (DC) voltage. In this paper, parallel liquid immersed dielectric (LID) model with needle-plate electrodes is established as an example to explain the morphological change of streamer by studying the distribution of electric field and space charge in the oil gap. Then, change the voltage of needle electrode and record the distance between the head of streamer and the tip of needle electrode to discuss the relationship between the average speed of the streamer and the voltage of needle electrode. Finally, the influence of surface charge density on the minimum breakdown voltage and breakdown time of streamer is analyzed by setting different surface charge density of the pressboard. The experimental data and results from software simulation can provide a new theoretical support for the state diagnosis and improved optimization of oil-paper insulation structure in the future. © 2020 IEEE.

关键词： Electrodes

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Vibration Simulation and Experimental Analysis of Medium-Frequency Transformer with the Nanocrystalline Core 2

Vibration Simulation and Experimental Analysis of Medium-Fre...

引用

2nd IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2021

作者： Chen, Bin Xi, Binsheng Guo, Hao Xu, Li Tang, Bo China Three Gorges University Hubei Provincial Engineering Technology Research Center for Power Transmission Line Yichang443002 China China Three Gorges University College of Electrical Engineering New Energy Yichang443002 China Key Laboratory of Hunan Province Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory Changsha410100 China

ISBN: (纸本)9781665400640

Medium-frequency transformer (MFT) is the core component of high voltage and large capacity DC/DC converter, but high frequency and high power density will lead to intensified transformer vibration. Magnetostriction and air gap Maxwell force are the main sources of vibration and noise. In this paper, nanocrystalline alloy with high saturation magnetic density, high magnetic permeability and low high frequency loss is used as the core of MFT to study its vibration characteristics. Considering the influence of transverse isotropy of nanocrystalline alloy core mechanical properties, the transient electromagnetic field-structure field weak coupling calculation method based on ANSYS finite element method is used to calculate two MFTs with 10kVA/5kHz shell-type and core-type nanocrystalline cores under no-load sine condition. The calculated volume force is imported into the structural field to obtain the vibration acceleration and displacement changes of the core, and the simulation value is compared with the experimental measurement value. The results show that the vibration of the shell-type core is stronger than that of the core-type core under the action of Maxwell force and magnetostrictive force. And the vibration acceleration frequency is twice the excitation frequency. The research in this paper can provide a basis for the design and optimization of vibration and noise of MFT. © 2021 IEEE.

关键词： Nanocrystals

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The Study of Novel Method to Measure Moisture Content in Transformer Oil Based on Terahertz technology 7

The Study of Novel Method to Measure Moisture Content in Tra...

引用

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

作者： Wang, Tingtin Yin, Jing Cheng, Li Zhang, Fuzeng Cheng, Zhidong China Southern Power Grid Co. Ltd Electric Power Research Institute Guangzhou Guangzhou China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China

ISBN: (纸本)9781728155111

Moisture content is an important parameter which can indicate the state of insulating material. Especially for power transformer, its insulation structure is consist of pressboard and insulating oil. In the aging processing of insulating materials, the moisture will be generated and distributed in the paper or insulating oil according to a certain proportion. As the materials aging, the moisture content will increase and itself can also accelerate the speed of material's aging. So it is necessary to measure and obtain the moisture content in insulating material including oil and paper. Traditional method to obtain the moisture content is not suitable to measure on site. THz radiation offers a high sensitivity for water and THz technology has become a fast and nondestructive test method for detecting the micro-water content of substances. So THz-TDS (terahertz time domain system) is introduced to measure the moisture content in insulating oil. In this paper, oil sample with different moisture content are prepared through saturated water absorption carried out in the natural environment. And moisture content of samples are determined by using the titration. Before testing by THz-TDS, oil samples are put into fluid container. In the experimental processing, the response signals of time domain are obtained. Also the absorbance spectrum of terahertz waves in frequency domain is calculated. The results show that moisture in oil will caused absorption phenomenon even if its content is extremely low. When the moisture content of sample is higher, the power of transmitted waves is lower and phase delay is more. Then response signal of time domain is fitted using linear equation. And absorbance spectrum in frequency domain is fitted using equation of Beer-Lambert law. Results of these two fitting are compared and. show that equation of Beer-Lambert law has a better fitness in moisture content. It is proved that THz techniques can be a potential field test method to detect the

关键词： Moisture

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Research on intelligent terminal fusion scheme based on blockchain technology

Research on intelligent terminal fusion scheme based on bloc...

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2021 International Conference on power System technology, powerCON 2021

作者： Ma, Chao Zhai, Feng Yan, Xia-Qiang Zhang, Wei China Electric Power Research Institute Beijing China Tianjin University Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin China Beijing Huayuan Cryptology Blockchain Technology CO. LTD. Beijing China State Grid Jiang Su Electric Power Co. LTD. Changzhou Electric Branch Changzhou China

ISBN: (纸本)9781665407373

With the emergence of digital currency bitcoin, blockchain technology is a distributed shared database technology. The continuous development and updating of blockchain technology provides the possibility of its integration with more fields;At present, Internet of things technology has been widely concerned at home and abroad. This paper first introduces the principles and characteristics of blockchain technology and Internet of things technology, then discusses the integration of blockchain technology and Internet of things technology, introduces the intelligent terminal system based on the integration of blockchain and Internet of things, explains two application scenarios, and finally analyzes the development direction of blockchain and Internet of things technology in the future. This electronic document is a "live"template and already defines the components of your paper [title, text, heads, etc.] in its style sheet. © 2021 IEEE.

关键词： Internet of things

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