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Design and optimization of parameters of electric vehicle's wireless power transmission system to decrease the influence of coexistence interference 2

Design and optimization of parameters of electric vehicle's ...

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2nd IEEE International Conference on Electronics technology, ICET 2019

作者： Tan, Linlin Tang, Zongyao Wang, Songcen Li, Zishou Zhao, Wenxuan Zhong, Ruying Huang, Xueliang School of Electrical Engineering Southeast University Key Laboratory of Smart Grid Technology and Equipment in Jiangsu Nanjing China School of Electrical Engineering Southeast University Nanjing China China Electric Power Research Institute Beijing China State Grid Hubei Electric Power Co.LTD Wuhan China

ISBN: (纸本)9781728116181

Electromagnetic interference has always been a significant issue in electric vehicle's(EV) wireless power transmission(WPT) system, the interference will not only bring about frequencies subject to interference to other systems, but also can produce interference to other EV's WPT system. In the past studies, the majority of system designs implement additional control means to ameliorate interference with the WPT parameters that have been designed. Therefore, this paper aims to provide some engineering reasonable design and optimization guidance through effective experiments for EV's WPT system. The paper starts with the parameters of the EV's WPT system, sets up a reasonable range of variation, analyzes the influence of many parameters on the coexistence between systems, and confirms the optimization scheme by calculating the unified evaluation criteria. At last, the design suggestions and guidance are proposed in paper. © 2019 IEEE.

关键词： Signal interference

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Study of Electromagnetic Influence on the Low-voltage Secondary Cables when Lightning Strikes Thermal power Plants

Study of Electromagnetic Influence on the Low-voltage Second...

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2019 IEEE International Conference on power, Intelligent Computing and Systems, ICPICS 2019

作者： Hu, Zhenxing Ding, Wei Yang, Tao Luo, Xiaokang Tao, Yaqin Shen, Zeliang Southwest Electric Power Design Institute Co. Ltd. China Power Engineering Consulting Group Chengdu China State Grid Chongqing Jiangbei Power Supply Company Chongqing China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728137209

When solving the electromagnetic compatibility problem of low-voltage distribution system in thermal power plants, it is found that the current protection specifications for secondary cables in some conventional substations and common civil buildings are not suitable for thermal power plants, and there is a lack of reference standards for lightning protection data of secondary cables in thermal power plants. Therefore, this paper takes Xishui Substation as the research object, uses CDEGS software to build a three-phase low-voltage distribution system combined with the structural characteristics of large-scale ground screen, overhead cable bridge, building group and others of thermal power plants, and completes the modeling of its buildings, grounding grid, transformer and secondary overhead cable bridge. According to the layout of two buildings in the low-voltage distribution system, the overvoltage of the secondary power cable generated when the buildings are struck by lightning is calculated. The results show that the lightning strike will cause great electromagnetic influence on the secondary equipment. This provides data support for the layout design and protection of secondary cables in thermal power plants, and is of great significance for improving the insulation coordination capability of secondary systems. © 2019 IEEE.

关键词： Buildings

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Research on a Bluetooth Low Energy Warning Method

Research on a Bluetooth Low Energy Warning Method

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作者： Yan Long Yongli Chen Deyong Xiao Zheng Li Tianpeng Hou Zhiwei Zhang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd.

With the development of society, intelligent terminal equipment is used more and more widely. The use of intelligent terminals to locate children's position, to ensure that children are in a safe and controllable range, is more favored by parents. But now the smart watch needs to install the mobile phone card, which depends on the mobile phone traffic to locate, and the cost is relatively high. This paper proposes a Bluetooth low energy warning method to solve this problem. The distance between the two devices is calculated by the signal strength indication value received by the intelligent terminal, and then compare the preset received signal strength indication value with the received signal strength indication value, as well as the preset distance value and the calculated distance value of the two devices. When the received signal strength indication value is less than the preset value or the distance between the devices exceeds any of the preset values, the wireless device and the intelligent terminal will send an alarm at the same time to remind the two sides wearing the intelligent terminal and the Bluetooth device that the distance between the two sides has exceeded the safety value. The Bluetooth low energy warning method proposed in this paper has the characteristics of low cost and low energy consumption.

关键词： Research on a Bluetooth Low Energy Warning Method Bluetooth

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A Review of Hybrid Three-Level ANPC Inverters: Topologies, Comparison, Challenges and Improvements in Applications

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Energies 2025年第10期18卷 2613-2613页

作者： Mu, Xiaobin Chen, Hao Wang, Xiang Wu, Weimin Wang, Houqing Yuan, Liang Chung, Henry Shu-Hung Blaabjerg, Frede State Key Laboratory of Advanced Power Transmission Technology Department of Power Electronics China Electric Power Research Institute Beijing102209 China Electrical Engineering Department Shanghai Maritime University Shanghai201306 China School of Electrical and Information Engineering Anhui University of Science and Technology Huainan232001 China Department of Electrical Engineering the Centre for Smart Energy Conversion and Utilization Research City University of Hong Kong 999077 Hong Kong Energy Engineering Department Aalborg University Aalborg9100 Denmark

Considering the cost, efficiency, power density, and other issues of the power electronic system, many papers have mixed the wide-bandgap (WBG) power devices, mainly SiC MOSFET and GaN FET/HEMT, with Si IGBT/MOSFET in the three-level active neutral-point clamped (T-ANPC) topology, forming the hybrid T-ANPC (HT-ANPC) topology. This paper reviews these latest HT-ANPC topologies from the perspective of the material types of switching devices and compares the advantages and disadvantages of various topologies. The potential challenges of HT-ANPC inverters in several mainstream applications are reviewed, and their improvements are compared and discussed in detail. Next, a brief topology selection and design process are provided based on analyzing various typical topologies. In addition, some future research trends on this topic are discussed. The paper will help researchers to select appropriate HT-ANPC topologies in different applications and have a better understanding of the critical issues to be considered during system design. © 2025 by the authors.

关键词： Silicides

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Optimal frequency design of wireless charging system based on harmonic analysis 2

Optimal frequency design of wireless charging system based o...

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2nd IEEE International Conference on Electronics technology, ICET 2019

作者： Tan, Linlin Zhao, Wenxuan Wang, Songcen Zhong, Ruying Li, Zishou Huang, Xueliang School of Electrical Engineering Southeast University Key Laboratory of Smart Grid Technology and Equipment in Jiangsu Nanjing China School of Electrical Engineering Southeast University Nanjing China China Electric Power Research Institute Beijing China State Grid Hubei Electric Power Co.LTD Wuhan China

ISBN: (纸本)9781728116181

Recently, wireless charging industry has developed rapidly. However, there is no frequency division for electric vehicles (EV) in China, lacking theoretical and practical support based on systematic in-depth research. Therefore, this paper proposes an optimal frequency design method for wireless charging systems based on harmonic analysis, and designs the optimal frequency based on the coexistence system of EV Wireless power transmission(WPT) system and AM broadcasting system. It is concluded that at the operating frequency of 85 kHz, considering the attenuation of the field strength of the parking lot building wall, the EV wireless charging system does not substantially interfere with the reception of the AM broadcast signal. © 2019 IEEE.

关键词： Harmonic analysis

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Compliance verification and probabilistic analysis of state-wide power quality monitoring data

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Global Energy Interconnection 2018年第3期1卷 391-395页

作者： Liu Yang Jiang Peng Tongxun Wang Yaqiong Li Zhanfeng Deng Yingying Liu Meng Tan State Grid Corporation of China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute (GEIRI)

This paper introduces the implementation and data analysis associated with a state-wide power quality monitoring and analysis system in China. Corporation specifications on power quality monitors as well as on communication protocols are formulated for data transmission. Big data platform and related technologies are utilized for data storage and computation. Compliance verification analysis and a power quality performance assessment are conducted, and a visualization tool for result presentation is finally presented.

关键词： power quality Monitoring Big data Hadoop Compliance verification

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Study on the influence of surface state of copper conductor of oil-immersed power transformer on sulfur corrosion

Study on the influence of surface state of copper conductor ...

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International Symposium on Electrical Insulating Materials

作者： Dong Ding Lijun Yang Yuan Yuan Sihang Gao Yuncai Lu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University College of Material Science and Engineering Chongqing University College of Automation Chongqing University of Posts and Telecommunications State Grid Jiangsu Electric Power Co. Ltd. Electric Power Research Institute Nanjing

ISBN: (数字)9784886864185

ISBN: (纸本)9781728143484

The sulfur corrosion of copper conductors in oil-immersed transformers is affected by the corrosive sulfur content, atmosphere, operating temperature, etc. However, both laboratory studies and field evidences indicate that the influence of the covering state of copper conductors on corrosion should not be ignored. Hence, this paper focuses on the impact of different covering status, including the covering materials and the number of the layers of insulating paper, on the corrosion of copper conductors in thermal aging. The result shows that the existence of a particular gap between the copper conductor and the covering layer is a significant factor to the sulfur corrosion of copper conductors by the concentration cell effect. Insulating paper around copper contributes to a region concentrated with DBDS, Cu 2+ , H + and other substances due to the adsorption and impediment effect of insulating paper, which plays a key role in facilitating the sulfur corrosion of copper conductors.

关键词： Copper Corrosion Conductors Oils Sulfur Ions Surface treatment

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Study on voltage distribution characteristic of a 363 kV fast multi-break vacuum circuit breaker

Study on voltage distribution characteristic of a 363 kV fas...

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作者： Shaogui, Ai Xiao, Yu Yongning, Huang Fan, Yang Yiping, Fan Xing, Li Electric Power Research Institute of Ningxia Electric Power Company of State Grid Corporation of China Yinchuan750001 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400044 China

Vacuum circuit breaker (VCB) has a longer life and shorter opening time than SF6 circuit breaker, but current single-break VCB cannot be applied in high-voltage power system directly. Here, a fast 363 kV multi-break VCB design is presented and its voltage distribution characteristic and stray capacitors are analysed. A three-dimensional finite-element model of modularised hexa-break VCB composed of 12 vacuum interrupter modules installed on three series connected platforms is developed to calculate the voltage distribution and distributed capacitances. The result shows that the voltage distribution is uneven, and the first break shares the 67.974% of the whole applied voltage. On account of distributed capacitances parameters, an equivalent capacitance model with PSCAD is built to discuss the voltage distribution characteristic at different grading capacitance values, and the optimal grading capacitance value is determined to 10 nF. © 2019 Institution of Engineering and *** right reserved.

关键词： Electric circuit breakers

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Research on the corrosive effect of inactive sulfur on oil-paper insulation

Research on the corrosive effect of inactive sulfur on oil-p...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Sihang Gao Jiajun Li Tingjing Ke Yang Liu Dong Ding Key Laboratory of Industrial Internet of Things and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China State Grid Chongqing Electric Power Company Chongqing Chongqing China Baoding Electric Power Corporation Baoding China State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New technology Chongqing University Chongqing China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

Sulfur corrosion induced by active sulfur has been proved to significantly decrease the insulation performance of oil-immersed equipment. In order to protect the oil-paper insulation from sulfur corrosion, active sulfur is cleared in the refining process of crude oil. Some inactive sulfur with high-efficiency antioxidant is still retained in the mineral oil to improve the oxidation stability of oil, such as thiophenic compounds. However, the corrosive effect of inactive sulfur on the oil-paper insulation has not yet clear. Therefore, thiophene that is the largest content of sulfide in the insulating oil was selected as the research object, a series of accelerated thermal ageing experiments of oil-paper without and with thiophene under the different high temperature were conducted, scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (SEM/EDX) and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used to characterize the corrosion degree of oil-paper insulation. The results show that no corrosive deposit was observed on the surface of oilpaper insulation without thiophene even at very high temperature, while a few corrosive deposit was accumulated on the surface of oil-paper insulation with 500 mg/kg thiophene. The corrosion degree of oil-paper insulation with thiophene had an uptrend as the increase of temperature (130°C-180°C), preliminarily indicating that thiophene may be activated in the oil-paper system under the action of overheating fault of oil-immersed transformer and posed a corrosion threat to oil-paper insulation.

关键词： Copper Sulfur Corrosion Oils Windings power transformer insulation Oil insulation

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A triboelectric nanogenerator with efficiency enhancement based on relative inversion for smart agriculture

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Nano Materials Science 2025年

作者： Hongwei Han Juncheng Luo Lingxiao Gao Qibo Deng Lu Han Libin Zhao Ning Hu Xiaojing Mu School of Mechanical Engineering and School of Electrical Engineering Hebei University of Technology Tianjin 300401 China Key Laboratory of Optoelectronic Technology & Systems Ministry of Education International R&D Center of Micro-Nano Systems and New Materials Technology Chongqing University Chongqing 400044 China State Grid Xuzhou Power Supply Company Xuzhou 221000 China Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education Tianjin 300401 China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology Hebei University of Technology Tianjin 300401 China Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin 300401 China

The emergence of smart agriculture has enabled functions such as agricultural visualization, remote control, and disaster forecasting. In the process of smart agriculture construction, a substantial number of sensors are typically required to effectively monitor environmental parameters. In this study, a high-power density double-rotor triboelectric nanogenerator (DR-TENG) integrating wind energy harvesting and environment monitoring is introduced, by which the relative velocity between the two rotors is augmented through rotational reversal, thereby enhancing output performance and monitoring accuracy. By virtue of this mechanism, the output current witness a remarkable enhancement of 76.7 % under the wind speed of 4 m/s. There is an excellent linear correlation coefficient (99.9 %) between the signal frequency of DR-TENG and the excitation wind speed, indicating that the DR-TENG exhibits exceptional sensing performance. The present study establishes a wireless sensing system for smart agriculture based on DR-TENG, which integrates a power supply circuit, signal processing circuit, temperature sensor, and Zigbee module, enabling self-powered real-time monitoring of wind speed and temperature. Additionally, the DR-TENG can be used to recognize humidity. The accuracy of humidity recognition based on deep learning model reaches 98 %. This work presents an efficient and viable method for wind energy harvesting and environment monitoring.

关键词： Triboelectric nanogenerator smart agriculture Double-rotor structure Wind energy harvesting and sensing integration

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