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analysis of a Hybrid Field-Modulated Linear Generator For Wave Energy Conversion

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 2018年第3期28卷 1-5页

作者： Huang, Lei Chen, Minshuo Wang, Linlin Yue, Fuchang Guo, Rong Fu, Xiangyun Southeast Univ Sch Elect Engn Jiangsu Prov Key Lab Smart Grid Technol & Equipme Nanjing 210018 Jiangsu Peoples R China Southeast Univ Sch Elect Engn Nanjing 210018 Jiangsu Peoples R China Henan Bldg Mat Res & Design Inst Co Ltd Zhengzhou 450000 Henan Peoples R China State Grid Lianyungang Power Supply Co Lianyungang 222000 Peoples R China

Direct-drive wave energy converter (DD-WEC) is limited by low power density caused by low direct-drive speed. A tubular hybrid field-modulated linear generator is proposed to improve the performance of DD-WEC. The generator adopted a field-modulated design to increase the output voltage of the linear generator. A hybrid excited field coil can be used to adapt to different wave situations and effectively improve the output performance of this kind of generator. The operation of the proposed generator is analyzed, and the generator performance is evaluated through finite element method and compared with those of three other generators, namely, a field modulated linear generator with parallel magnetic-circuit, a secondary surface PM field modulated linear generator, and a secondary surface PM fractional-slot linear generator. Results show that the proposed generator exhibits high power density and low cogging force. The steady output power and output voltage of are marginally higher in the proposed generator than in the conventional generators.

关键词： Field modulation hybrid excitation permanent magnet linear generator wave energy conversion

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Research on Fault Diagnosis of power Transformer Equipment Based on KNN Algorithm

Research on Fault Diagnosis of Power Transformer Equipment B...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2017

作者： Yu, Huadong Wu, Qing Lu, Yongling Hu, Chengbo Wang, Yubo Liu, Guohua State Grid Information and Communication Industry Group Beijing100031 China State Grid Jiangsu Electric Power Company Research Institute Nanjing211103 China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China

ISBN: (纸本)9783319709895

power equipment is of great importance to the power of things, the operation of equipment directly impact on the safety and stability of the power of things. Therefore, it is important to ensure secure and stable operation of the power grid by prejudging monitoring, observing and fault diagnosis of power equipment. A fault diagnosis method of power equipment based on the technology of power internet of things and KNN algorithm is proposed in this paper. Through the real-time sensing and data acquisition of the basic equipment status in power network operation, the equipment status is analyzed and prejudged, which can provide alarm signals of the equipment to avoid greater security risk. © 2018, Springer International Publishing AG.

关键词： Failure analysis

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Thermal Characteristics of Positive Leaders under Different Electrode Terminals in a Long Air Gap

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ENERGIES 2019年第21期12卷 4024-4024页

作者： Du, Mingxing Tang, Yu Li, Min Zou, Jiayong Ma, Yigang Sun, Jinyu Liu, Lei Zeng, Qingguo Tianjin Univ Technol Tianjin Key Lab Control Theory & Applicat Complic Tianjin 300384 Peoples R China China Southern Grid Elect Power Res Inst Guangzhou 510663 Peoples R China Southwest Elect Power Design Inst Co Ltd China Elect Power Engn Consulting Grp Chengdu 610021 Peoples R China CSG EHV Transmiss Co Dali Bur Dali 671000 Peoples R China Baiducom Times Technol Beijing Cov Ltd Syst Dept Beijing 100193 Peoples R China Bazhong Power Supply Co Sichuan Grid Bazhong 635500 Peoples R China

The thermal characteristics of the positive leader discharges occurring under the different electrode terminals in a 1 m rod-plate air gap were studied quantitatively using Mach-Zehnder interferometry and a high-speed video camera. When disturbed by the discharge channel, the interference fringes are distorted because of the change in the refractive index of air, which is related to the gas density. Therefore, the gas temperature and gas density distribution in the leader channel can be retrieved from the offset of the interference fringes. Based on these results, the thermal characteristics of the leader channel were studied under different electrode terminals with a radius of curvature of 2.5 mm and 5 mm for cone electrodes and a diameter of 40 mm for a spherical electrode. The results show that the gas temperature in the leader channel increased while the gas density decreased as the radius of curvature of the electrode terminal decreased. Additionally, a smaller radius of curvature leads to a larger thermal diameter, but the difference in the thermal diameter is not obvious;for the terminals used in this paper, the difference is within 2 mm.

关键词： long air gap discharge thermal characteristics Mach-Zehnder interferometry

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Multi-objective model and decision-making method for coordinating the ecological benefits of the Three Gorger Reservoir

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JOURNAL OF CLEANER PRODUCTION 2020年 270卷 122066-122066页

作者： Wang, Xianjia Dong, Zuo Ai, Xueshan Dong, Xuan Li, Yi Wuhan Univ Sch Econ & Management Bayi Rd 299 Wuhan 430072 Peoples R China Wuhan Univ Inst Syst Engn Bayi Rd 299 Wuhan 430072 Peoples R China Wuhan Univ State Key Labortatory Water Resources & Hydropowe Bayi Rd 299 Wuhan 430072 Peoples R China Wuhan Univ Hubei Prov Key Lab Water Syst Sci Sponge City Con Wuhan 430072 Peoples R China State Grid Hebei Elect Power Co Fuqiang St 98 Shijiazhuang 050000 Hebei Peoples R China Guizhou Survey & Design Res Inst Water Resource & Baoshan South Rd 27 Guiyang 550002 Peoples R China

The operation of the Three Gorges Reservoir (TGR) has changed the original flow regimes in the reservoir area, as well as middle and lower reaches of the Yangtze River, which may lead to algal blooms in the tributaries of TGR, changing conditions in the downstream of TGR for fish spawning and breeding, and saltwater intrusion in water sources area of Yangtze estuary. In this study, a multi-objective model is developed to improve the environmental issues both upstream and downstream of TGR by trading off the contradiction between the ecological benefits and the power generation considering these environmental problems mentioned above caused by the operation of TGR. Solving the multi-objective model with the non-dominated sorting genetic algorithm III (NSGA-III), the non-inferior solutions are obtained. And then the concept of subjective trade-off rate (STOR) is introduced to measure the level of preference of the decision-makers for each objective. Combining the STOR method and ecological risk analysis, a decision-making method is proposed to select the most suitable alternative. As a case study, the operation process of TGR in 2015 on a daily scale is simulated with the multi-objective model, and the most suitable operation rule is selected by decision-making method within the interval ranges for decision-makers' preference. Analyzing the effect of different trade-off rates combinations on the level of objectives in the suitable alternative, and the result indicates that when the trade-off rates in the combinations increase, the power generation increases but the ecological benefits reduce. Considering this relationship and the trade-off rate ranges both determined to be [1,1.5] with a step of 0.05, some schemes are established. And then the most suitable solution is selected from these schemes, whose power generation is 1.74% less than the maximum and its ecological risk probability is optimal. The most suitable operation rule derived by the multi-objective model a

关键词： Multi-objective Ecological benefit Objective trade-off rates Risk analysis Three Gorges Reservoir NSGA-III

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Reactive Planning of Island power grid Containing VSC-HVDC

Reactive Planning of Island Power Grid Containing VSC-HVDC

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China International Conference on Electricity Distribution (CICED)

作者： Zhong, Yujun Li, Cheng Ding, Xiaoyu Peng, Mingwei Li, Shu State Grid Zhoushan Power Supply Co Econ & Technol Res Inst Zhoushan Zhejiang Peoples R China Zhejiang Elect Power Design Inst Co Ltd China Energy Engn Grp Hangzhou Zhejiang Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

ISBN: (纸本)9781538667750

Island power grids usually face with more challenges than the traditional other types of grids. An approach of operation optimization for island power grid utilizing VSC-HVDC is proposed in this paper. It makes use of VSC to actively regulate active and reactive power. The goal to reduce power loss as well as optimize the economic costs due to the switching of capacitor banks in power stations is considered. In accordance with the characteristics of this model, an improved genetic algorithm is employed. Based on a practical project- Multi-terminal VSC-HVDC Demonstration Project in Zhoushan, the effects of the proposed approach is demonstrated.

关键词： Island power grid operation optimization reactive power compensation multi-terminal VSC-HVDC

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Feature Extraction of Electrical Equipment Identification Based on Gray Level Co-occurrence Matrix

Feature Extraction of Electrical Equipment Identification Ba...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2017

作者： Ou, Qinghai Yu, Huadong Zeng, Lingkang Liu, Zhu Liao, Xiao Wang, Yubo Liu, Guohua Lu, Yongling Hu, Chengbo Zhang, Nan Xia Tang, Qian State Grid Information and Telecommunication Group Co. Ltd Beijing102211 China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing100192 China State Grid Jiangsu Electric Power Company Research Institute Nanjing211103 China North China Electric Power University Beijing102206 China

ISBN: (纸本)9783319659770

With the development of the electricity industry in our country, the kinds and the quantities of electrical equipment are increasing quickly. When the electrical equipment is checked and evaluated, the recognition of equipment is very important. In this paper, based on gray level co-occurrence matrix to extract the texture of equipment, we proposed a way to identify the electrical equipment. First it uses the gray level co-occurrence matrix texture matching recognition of electrical equipment, and then adopts the method of fuzzy logic according to the result of the match on the classified recognition of electric equipment. By the experiments, the correctness and feasibility of identification method to the electrical equipment are proved. © 2018, Springer International Publishing AG.

关键词： Feature extraction

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Target Positioning Optimization Method in power System

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IOP Conference Series: Earth and Environmental Science 2021年第1期814卷

作者： S Ba Z B Hou D W Wang G Y Shi W H Zhang X J Han C Y Dong J J Liu State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd C-3 Dongsheng Science and Technology Park No.66 Xixiaokou Rd Haidian District Beijing China Beijing Smart-Chip Semiconductor Technology Co. Ltd China Sciences Cloud Valley Park No.79 Shuangying West Changping district Beijing 102200 China

This thesis presents a method that a position measurement method for moving targets is proposed based on the positioning method based on the time difference of arrival (TDOA) which is based on the research on the positioning problem of station inspection operators and equipment in complex working conditions. The probability error method is introduced to optimize the traditional positioning method that realizes the target node positioning by optimizing the distance difference between the target node to be located in the network domain environment and different base stations, which can effectively improve the positioning accuracy of staff and equipment in the station. Through experiments in a complex power frequency electric field environment, the test results show that the results calculated by the optimization method are better than the existing traditional positioning methods, and can effectively improve the positioning accuracy under the condition of line-of-sight, and realize the substation space Mobile target positioning to ensure the safety of operators.

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A survey on Wi-Fi HaLow technology for Internet of Things 2

A survey on Wi-Fi HaLow technology for Internet of Things

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2nd IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Qiao, Lei Zheng, Zhe Cui, Wenpeng Wang, Liang Beijing Smart Chip Microelect Technol Co Ltd State Grid Key Lab Power Ind Chip Design & Anal T Beijing Peoples R China Beijing Smart Chip Microelect Technol Co Ltd Beijing Engn Res Ctr High Reliabil IC Power Ind G Beijing Peoples R China

ISBN: (纸本)9781538685495

Wi-Fi HaLow is a wireless networking protocol: IEEE 802.11ah, which was published on May 10th 2017. The technology's low power consumption competes with LoRa, ZigBee, Bluetooth. It uses sub 1 GHz (S1G) license-exempt bands, allowing the creation of large groups of stations or sensors, to provide extended range Wi-Fi networks and support the concept of Internet of Things (IoT). This paper gives an overview of the Wi-Fi HaLow technology, which is able to solve the weakness of Wi-Fi in penetrability and transmission distance up to 1km at the default transmission power of 200mW.

关键词： ICT Wi-Fi HaLow LPWAN Internet of Things

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Excitation Effect analysis of a Novel HTS Controllable Reactor With Orthogonally Configured Core Based on Dynamic Inductance Matrix

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IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 2018年第3期28卷 1-4页

作者： Wang, Zuoshuai Tang, Yuejin Yan, Sinian Ren, Li Gong, Kang Chen, Lu Zhang, Yu Xu, Ying Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Sch Elect & Elect Engn Wuhan 430074 Hubei Peoples R China Yichang Power Supply Co State Grid Yichang Yichang 443000 Hubei Peoples R China CSSC Shanghai Merchant Ship Design & Res Inst Shanghai 201203 Peoples R China

The controllable reactor is one of the most effective methods for compensating reactive power. A novel type of high temperature superconducting (HTS) controllable reactor with orthogonally configured core has been proposed, analyzed, and developed. However, for the controllable reactor with dynamic inductance, the excitation analysis based on field circuit coupled method is inefficient and the excitation parameters optimization is more difficult. In this paper, an excitation system containing a voltage source converter and buck-boost converter is established. The reactor is built as a self-defined nonlinear element in the system model based on the dynamic inductance. The inductance matrix, core saturation, leakage magnetic field at HTS winding, and total magnetic flux in the excitation core are included in the self-defined element. The parameters of the excitation system have been optimized easily. The simulation result of the output characteristic of the reactor is consistent with the experimental observations of the prototype. The dynamic inductance method is proved to be fast and effective.

关键词： Dynamic inductance excitation system HTS controllable reactor self-defined element

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Research on Identification Method of Transformer Based on Improved Hu Invariant Moments

Research on Identification Method of Transformer Based on Im...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2017

作者： Yu, Hua-dong Ou, Qing-hai Wu, Qing Zhang, Zhe Li, Wen-jing Wang, Yubo Liu, Guohua Lu, Yongling Hu, Chengbo Liu, Na Wang, Rong State Grid Information and Telecommunication Group Co. Ltd. Beijing China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China State Grid Jiangsu Electric Power Company Research Institute Nanjing21110 China Control and Computer Engineering College North China Electric Power University NCEPU Beijing China

ISBN: (纸本)9783319709895

With the rapid development of electric power industry and the expansion of power grid scale, more and more attentions have been paid to the safe operation of electrical equipment. The target recognition method we used now couldn’t recognize power transformer well, which is based on gray information. In this paper, a transformer identification algorithm based on improved Hu moment invariants is proposed. The transformer identification algorithm proposed in this paper has the advantages of good recognition effect and high recognition accuracy. The correctness and feasibility of the proposed algorithm have been verified by experiments. © 2018, Springer International Publishing AG.

关键词： Template matching

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