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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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The Study Of Novel Method To Measure Moisture Content In Transformer Oil Based On Terahertz technology

The Study Of Novel Method To Measure Moisture Content In Tra...

引用

International Conference on High Voltage Engineering and Application, ICHVE

作者： Tingtin Wang Jing Yin Li Cheng Fuzeng Zhang Zhidong Cheng 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: (数字)9781728155111

ISBN: (纸本)9781728155128

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 Oils Moisture measurement Time-domain analysis Frequency-domain analysis Absorption Mathematical model

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Reactive power and Voltage Coordinated Control of Wind Farm for Parallel Running STATCOM

Reactive Power and Voltage Coordinated Control of Wind Farm ...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Xu, Lufei Chen, Tianhua Yang, Luo Chen, Jianhua Du, Lei Zhong, Hailiang NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China State Grid Ningxia Electric Power Co. Ltd. Yinchuan750001 China

ISBN: (纸本)9781728135205

To solve the reactive power and voltage coordinated control of parallel running static synchronous compensator (STATCOM) in wind farm, a reactive power and voltage coordinated control strategy is proposed based on the united control mode of voltage control and reactive power control. The strategy makes full use of the control characteristics of STATCOM fast regulation and stable voltage, the voltage of the point of common coupling (PCC) connect with power system is quickly adjusted, and optimize the dynamic reactive power which reserve in wind farm. Finally, the wind farm in china wind power cluster area is taken as an example for practical application, the practical application results verify the correctness and effectiveness of the proposed control strategy. © 2019 IEEE.

关键词： Voltage control

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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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International Conference on power System technology (powerCON)

作者： Chao Ma Feng ZHAI Xia-qiang YAN Wei ZHANG China Electric Power Research Institute Beijing China Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin University Tianjin China Beijing Huayuan Cryptology & Blockchain Technology CO. LTD. Beijing China Changzhou Electric Branch State Grid Jiang Su Electric Power Co. LTD. Changzhou China

ISBN: (纸本)9781665407380

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.

关键词： smart cities Online banking Education smart homes Medical services Blockchains Safety

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

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

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Ziyue Zhang Hongshun Liu Zhitong Xue Ali Mohammed Ali Abdo Qingquan Li Jianping Jiang Wentao Qu Mu Qiao 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: (数字)9781728155111

ISBN: (纸本)9781728155128

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.

关键词： Electrodes Surface morphology Oils Ions Surface discharges Partial discharges Electric fields

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High-frequency modeling of PMSM by the VF-PSO in electric vehicles

High-frequency modeling of PMSM by the VF-PSO in electric ve...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Peng, Wenxin Li, Songnong Wu, Zhao Zhang, Huaiqing Chen, Lin Peng, Hemeng State Grid Chongqing Electric Power Research Institute Chongqing Key Laboratory of Energy Internet Advanced Metrology and Measurement Technology Chongqing China State Key Laboratory of Transmission Equipment and System Safety and Electrical New Technology Chongqing China Chongqing Ceprei Industrial Technology Research Institute Chongqing China

ISBN: (纸本)9781728149301

This electronic document is a "live" template and already defines the components of your paper [title, text, heads, etc.] in its style sheet. CRITICAL: Do Not Use Symbols, Special Characters, Footnotes, or Math in Paper Title or Abstra Permanent magnet synchronous motor (PMSM) has been widely applied in Electric vehicles. But PMSM is a main propagation path for CM and DM conducted emission of the drive system, many high-frequency harmonic components generated by dv/dt (di/dt) can be find in the motor terminals. In order to research the conducted EMI in the drive system, a PMSM modeling is proposed, the parameters of high frequency model of motor are extracted by VF method and optimized by PSO algorithm. The calculated results is compared with the experimental impedance measured on a 45 kW PMSM, which shows fairly high accuracy in the frequency range of 100 kHz-110 MHz. © 2019 IEEE.

关键词： Electric vehicles

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Study on the influence law of typical soil parameters based on discharge morphology on critical breakdown field strength

Study on the influence law of typical soil parameters based ...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Shizun Pu Jialun Li Hongmei Li Pinglin Liu Qingjun Peng Tao Yuan Dehong Power Supply Bureau of Yunnan Power Grid Corproation Dehong Yunnan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Electric Power Research Institute of Yunnan Power Grid Corproation Kunming Yunnan China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

The phenomenon of partial discharge of soil that occurs when a lightning current enters the ground through a ground electrode poses a threat to the safety of personnel and equipment. The strength of partial discharge and the formation of soil discharge channels are closely related to the magnitude of the critical breakdown field strength. Therefore, how to accurately obtain the variation law of the critical breakdown field strength of typical soil is the key to realize the safe operation of the grounding device and the cable in the ground and ensure the safety of personnel and equipment. In this paper, a simulation experiment of soil impact characteristics is used to study the variation law of typical soil critical breakdown field strength with soil properties. X-ray transmission imaging technology is used to obtain the morphology of the discharge channel, and its non-intrusive observation method will not disturb the discharge channel itself, making the measurement more accurate. This paper first selects a variety of typical soils to study the influence of soil moisture, salt content, compactness and other factors on the discharge channel morphology, and then studies the calculation method of the critical breakdown field strength of the soil under different discharge channel morphologies. And further explore the reasons for the influence of typical soil media factors on the critical breakdown field strength. The experimental results show that under the same conditions, the relationship between the critical breakdown field strength values of different soils is: Ec of sandy soil

关键词： Soil Electric breakdown Discharges (electric) X-ray imaging Electrodes Morphology Conductivity

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Study on Lightning Intrusion Overvoltage of Traction Substation at High Altitude

Study on Lightning Intrusion Overvoltage of Traction Substat...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Fangrong Zhou Xiaotian Wang Yi Ma Qingjun Peng Yutang Ma Tao Yuan 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: (数字)9781728155111

ISBN: (纸本)9781728155128

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.

关键词： Lightning Substations Insulators Voltage control Poles and towers Rail transportation Discharges (electric)

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Fiber-Enhanced Raman Spectroscopy for Simultaneous Detection of Fault Characteristic Gases Dissolved in Transformer Oil

Fiber-Enhanced Raman Spectroscopy for Simultaneous Detection...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Jianxin Wang Weigen Chen Pinyi Wang Feng Zhou Shiyezi Xiang Qingjun Peng State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Power Science Research Institute of Yunnan Power Grid Co. LTD Kunming China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

Dissolved gas-in-oil analysis (DGA) is one of the most effective method to realize power transformers' operation status diagnosis. Fiber-enhanced Raman spectroscopy has the unique advantage of using one single wavelength laser to simultaneously achieve highly selective and sensitive detection of mixture gases within a few seconds, making it the most promising technology in gas sensing field. This paper developed an innovative Raman gas sensing system that used a 2-meter hollow-core anti-resonant fiber (HC-ARF), which confined most of the light in the hollow core and simultaneously worked as a sample container, to increase the effective interaction path length of light-analyte as well as the collection efficiency of Raman-scattered light. The Raman spectrum of mixed seven kinds of fault characteristic gases dissolved in transformer oil, including H 2 , CO, CO 2 , CH 4 , C 2 H 6 , C 2 H 4 , C 2 H 2 , was obtained and a limit of detection of 62, 194, 189, 34, 63, 128, 36 ppm for the characteristic Raman shift at 4156, 2143, 1388, 2917, 2955, 1625, 1972 cm -1 was achieved, respectively. The gas filling time for this novel HC-ARF was investigated by monitoring the Raman peak height of CH 4 at 2917 cm -1 until it tended to be unchanged. Moreover, the Raman peak intensity and width of CH 4 (2917 cm -1 ) at different laser power were studied. The results indicated that the Raman peak area and height showed a good linear relationship with the laser power, while the full width at half maximum (FWHM) was independent. On the basis of the superiority and versatility, we expect that FERS has high application-potential in transformers' fault diagnosis.

关键词： Raman scattering Gases Gas lasers power lasers Oil insulation Sensors Filling

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Simulation of gas diffusion in hollow-core photonic crystal fiber

Simulation of gas diffusion in hollow-core photonic crystal ...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Peng Qingjun Qian Guochao Peng Hui Zhou Feng Wang Jianxin Wang Jiaxua State Grid Yunnan Electric Power Research Institute of Yunnan Power Grid Co Yunnan China Yunnan Transformer Electric Co. Ltd Yunnan China State Key Laboratory of Transmission and Distribution Equipment and System Security and New Technology Chongqing University Chongqing China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

Hollow-Core Photonic Crystal Fibers (HC-PCFs) have aroused great interest in the field of fiber-based gas sensing, where high sensitivity, fast response, and distribution sensing are required. One of the most important factors for gas sensing is the response time that the gas fills the hollow core of the fiber. In order to achieve rapid response for gas sensing, various techniques have been investigated in the literature, such as lateral drilled side holes. Though the gas concentration along the fiber at a certain time can be expressed, it do not give a satisfied explanation to the mechanism of gas flow in HC-PCFs drilled with side holes, which is essential to determine the optimum design parameters of the fiber sensor, such as the size and spacing of drilled side holes. This study aims to analyze the gas flow behavior and determine the response time of HC-PCFs with drilled side holes by developing and applying a numerical model based on gas diffusion in a microchannel. The diffusion takes place at the atmospheric temperature and pressure. Both ends of the HC-PCF are spliced to single mode fibers, the side holes whose diameter is 10 μm are open to the air. The open side holes are embraced with gas species, the transient diffusion process between the air and the gas species. The model is validated against the results of two different experimental studies. The model is then applied to determine the response time as a function of the length, the number and spacing of side holes. It is found that an inverse relationship exists between the effects of number and spacing of side holes on the response time, suggesting that an optimum design point exists. The results obtained can be utilized for the fiber sensor design.

关键词： Optical fiber sensors Time factors Numerical models Fluid flow Optical fiber theory Sensors Photonic crystal fibers

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Study on Dispatching Decision Information of power Flow Distribution under Wildfire Disasters 3

Study on Dispatching Decision Information of Power Flow Dist...

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3rd IEEE Conference on Energy Internet and Energy System Integration, EI2 2019

作者： Yi, Yingwei Jian, Zhou Guo, Jun Xu, Kai Deng, Jie Huang, Qiang Changsha University of Science and Technology School of Electrical and Information Engineering Changsha China State Grid Hunan Electric Company Limited Disaster Prevention and Reduction Center State Key Laboratory Prevention and Reduction for Power Grid Transmission and Distribution Equipment Changsha China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131375

The dispatching decision information of power flow distribution under the wildfire disaster needs to consider the disturbance of the internal fault of the power grid and the influence of external factors. Aiming at the current situation of current dispatching decision information disposition, combined with the mechanism of line faults caused by wildfire disasters, an event evaluation system based on grid state, equipment status and weather conditions is established, a treatment method of dispatching decision information for power flow distribution based on decision tree is proposed. The process of decision making of power flow allocation scheme is illustrated by an example. The results show that the method is effective and improves the comprehensive capability of power grid dispatching emergency. © 2019 IEEE.

关键词： Decision trees

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