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The environmental evaluation of substation based on the fuzzy analytic hierarchy process

IOP Conference Series: Earth and Environmental Science 2018年第4期121卷

作者： Wenxiao Qian Xiujiang Zuo Yuandong Chen Ming Ye Zhankai Fang Fan Yang Electric Power Research Institute of East Inner Mongolia Electric Power Co. Ltd. HohhotInner Mongolia 010000China China southern Power Grid Ultra High Voltage Transmission Company Guizhou Guiyang 550000China State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University Chongqing 400044 China.

This paper studies on the different influences on the environment of the substations and puts forward an index system of environmental protection through the fuzzy analytic hierarchy process. A comprehensive environmental evaluation on a substation is carried out through investigation and measurement of the current environmental factors, and the statistical data has validated the effectiveness and feasibility of this evaluation index system. The results indicate that the proposed model has high efficiency.

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A Design of the Common Platform of Wireless Communication Based on FPGA

A Design of the Common Platform of Wireless Communication Ba...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Lei Qiao Zhe Zheng Wenpeng Cui Weilong Zhang Xueping Jiang Research Department of Smart Chip Global Energy Interconnection Research Institute State Grid Key Laboratory of Information & Network Security State Grid Laboratory of Electric Power Communication Network Technology

ISBN: (纸本)9781538614280

We present a design of the common platform of wireless communication based on FPGA. The platform, developed by us, allows researchers to modify transport protocols on any layer of an OSI reference model, from physical layer to application one, thereby it is feasible to implement multiple wireless communication protocols on different layers.

关键词： Wireless communication OFDM FPGA

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The influence of UHV hybrid reactive compensation and its stray capacitances on the interrupting characteristics of circuit breaker at out-of-phase fault 12

The influence of UHV hybrid reactive compensation and its st...

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12th IET International Conference on AC and DC power transmission, ACDC 2016

作者： Li, Runchang Liu, Hongshun Lou, Jie Li, Bin Lv, Tingting Li, Wei Liu, Haitao Shandong Provincial Key Laboratory of UHV Transmission Technology Equipment School of Electrical Engineering Shandong University Jinan250061 China State Grid Shandong Electric Power Maintenance Company Jinan250022 China State Grid Shandong Electric Power Economic Research Institute Jinan250021 China

ISBN: (纸本)9781785612268

The hybrid reactive compensation is expected to be applied in UHV transmission lines in the future, and its mutual influence with power grid is urgent to be studied. Considering the influence of the ground stray capacitance of the series compensation devices, the disposal scheme, and the installation position et al., the influence to the out-of-phase fault by the hybrid reactive compensation was computational analyzed. And the out-of-phase fault interrupting current amplitude, the transient recovery voltage(TRV) and the rate of rise of recovery voltage(RRRV) theoretical derivatived in the paper when considered the impact of the ground stray capacitance. The results show that with the increase of the stray capacitance value, TRV first peak value has linear downward trend, and has same impact on the RRRV and out-of-phase fault interrupting current amplitude. The controlled shunt reactor near the circuit breaker can reduce the severity of the out-of-phase fault compared with the series compensation devices close to it. TRV first peak value, its RRRV and the out-of-phase fault interrupting current can be decreased by increasing the distance between the controlled shunt reactor and the end of the line.

关键词： Electric circuit breakers

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Research and Application of Trans-Regional Cooperative Disposal of UHV Interconnected power grid

Research and Application of Trans-Regional Cooperative Dispo...

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： Shan Xin Li Jun Xu Xi Lu Jinjun NARI Group Corporation(State Grid Electric Power Research Institute) NanjingJiangsu Province211000China NARI Technology Co. Ltd.NanjingJiangsu Province211000China State Key Laboratory of Smart Gird Protection and Control NanjingJiangsu Province211000China

With the rapid construction of UHV AC/DC power grid,the integration characteristics of power grid are becoming more and more prominent,and real-time operation control of dispatching is significantly becoming more and more *** existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power *** on the existing achievements of dispatching automation system,the general goal and framework of the trans-regional cooperative disposal of UHV interconnected power grid are put forward,and the key technologies are analyzed in four aspects: situation awareness,fault location,joint disposal and cooperative control to provide reference and example for follow-up construction for real-time control and support system for the dispatching of UHV power grid.

关键词： UHV situation awareness cooperative disposal source grid load wide area graphic browsing DC fault diagnosis

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Reliability evaluation of medium voltage distribution network with private electric vehicle

Reliability evaluation of medium voltage distribution networ...

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2016 International Conference on Probabilistic Methods Applied to power Systems, PMAPS 2016

作者： Guanglin, Cai Yong, Lin Jiajia, Huan Ya, Chen Bo, Hu Bo, Li Guangdong Power Grid Development Research Institute Co. Ltd. Guangzhou China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781509019700

With the energy crisis and environment problem increasing prominently, as a new means of transportation, electric vehicles (EV, Electric Vehicle) will be accessed to distribution networks more and more, leading to a huge challenge on power system reliability. This paper mainly studies the reliability evaluation of medium voltage distribution network with private EV accessed. First based on the residents commuting patterns, the impact of private EV charging and discharging characteristics on the load profile is analyzed quantitatively. Based on load zoning, the optimal driving route model with the objective function of the shortest path and shortest time is proposed, which is then solved by the dynamic programming algorithm. Finally, by considering EV charging and discharging characteristics, spatial distribution characteristics, EV charging and discharging model is proposed. Then by studying the impact of distribution system failures during EV charging and discharging process, novel reliability indices are defined. Based on the considerations above, Monte Carlo simulation method based on Latin Hypercube Sampling is applied for reliability evaluation of medium voltage distribution system considering private EV accessed. A modified IEEE-RBTS Bus2 system is used as an example to analyze the impact of EV accessed ratio and EV charging mode on distribution system reliability, verifying the feasibility and effectiveness of the model and method proposed. © 2016 IEEE.

关键词： Reliability

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BOTDA based side hole fiber sensing

BOTDA based side hole fiber sensing

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OptoElectronics and Communications Conference, OECC

作者： Kai Xie Yanmin Chen Zhongbing Lu Quan Chai Yanlei Liu Yongkang Dong Jianzhong Zhang Lab of transmission line galloping prevention technique State grid Henan electric power research institute Zhenzhou China Key Lab of ln-Fiber Integrated Optics of Ministry of Education Harbin Engineering University Harbin China National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology Harbin China

We present the first demonstration of distributed strain/temperature sensing in side hole fibers (SHFs) based on Brillouin optical time domain analysis systems (BOTDA). The Brillouin frequency shift (BFS) of 10.22 GHz and the Brillouin linewidth of 40 MHz were measured. The temperature and strain coefficients of the Brillouin frequency shift are 1.08 MHz/O and 0.089 MHz/με, respectively. Compared with other types fiber, it has lower temperature sensitivity, higher strain sensitivity.

关键词： Scattering Strain Optical fibers Temperature sensors Temperature measurement Frequency measurement

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Research on electromagnetic environment characteristics of 500 kV full-scale substation based on BEM

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IOP Conference Series: Earth and Environmental Science 2018年第4期121卷

作者： Yuandong Chen Fangsheng Wang Tianye Li Kaidi Tang Zhankai Fang Ming Ye Electric Power Research Institute of East Inner Mongolia Electric Power Co. Ltd. Hohhot Inner Mongolia 010000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing 400044 China China Southern Power Grid Ultra High Voltage Transmission Company Guizhou Guiyang 550000 China.

Aiming at the electromagnetic environment of 500kV substation, a full-scale simulation model is proposed to calculate the electric field and magnetic field distribution using the boundary element method (BEM). To improve the simulation accuracy and convergence of computation, the structure of original electrical equipment is simplified, and then simplification principles are put forward. Finally, the full-scale model including the full outdoor equipment is established. Electric field and magnetic field distribution of the substation is obtained and compared with the measured value, and the excessive area is determined.

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A real-time simulation algorithm for power electronics circuit considering multiple switching events and its application on PXI platform 16

A real-time simulation algorithm for power electronics circu...

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16th International Conference on Environment and Electrical Engineering, EEEIC 2016

作者： Ji, Weijiang Wang, keyou Li, Guojie Zhuang, Jian Li, Siwei Li, Jun Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China Planning Department State Grid Tianjin Electric Power Corporation Tianjin China Technology Department Beijing Guodiantong Network Technology Co. Ltd Beijing China Operation Department State Grid Jiaxing Electric Power Corporation Zhejiang China

ISBN: (纸本)9781509023196

Real-time simulation technique of power systems is becoming realizable due to the growing significant computational power of computing platform. This paper builds a real-time prototypical platform based on PXI and LabVIEW as its main hardware and software architecture. Taking advantage of the integration characteristics of NI products, the platform embodies high expansibility and good compatibility and fits the needs of studying in university labs. Based on the platform, a real-time algorithm considering the multiple switching events is developed with a tradeoff between the computing power and the simulation accuracy. To validate the algorithm on the real-time prototypical platform, three-phase voltage source converter circuit and buck chopper circuit are studied with a 10μs time-step and 2kHz PWM frequency. The captured real-time results demonstrate high goodness of fit in comparison with the offline simulation of the systems in PSCAD/EMTDC. © 2016 IEEE.

关键词： Choppers (circuits)

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Investigation on Catastrophic Optical Damage Related to the Facet Coating in High power GaAs-based Laser Diodes

Investigation on Catastrophic Optical Damage Related to the ...

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2016 13th IEEE International Conference on Solid-state and Integrated Circuit technology (ICSICT)

作者： Yan-Bin Qiao Yan-Ning Chen Jin Shao Dong-Yan Zhao Hai-Feng Zhang Yang Zhao Wei Yang State Grid Key Laboratory of Power Chip Designing and Analysis Technology Beijing Smart-Chip Microelectronics Technology Company Limited Global Energy Interconnection Research Institute State Key Laboratory of Advanced Transmission Technology

The mechanism of Catastrophic Optical Damage（COD） related to the facet coating in 808-nm Ga As-based laser diodes was investigated experimentally using laser scanning confocal microscopy, energy dispersive X-ray spectroscopy（EDS） and selected area electron diffraction technology（SAED） under high-resolution transmission electron microscope in detail. The melting spots were observed in output facet after COD. The EDS line scanning results illustrate that the silicon layer near the active area is wider than that outside the active area after COD, indicating that silicon near the active area exposed to high laser intensity becomes diffused. Moreover, the result obtained from SAED technology identified that the silicon was changed into polycrystalline near the active area, contrasting to the silicon outside active area still remained initial single phase after COD.

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SFS: A massive small file processing middleware in Hadoop 18

SFS: A massive small file processing middleware in Hadoop

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18th Asia-Pacific Network Operations and Management Symposium, APNOMS 2016

作者： Huo, Yonghua Wang, Zhihao Zeng, Xiaoxiao Yang, Yang Li, Wenjing Zhong, Cheng Science and Technology on Information Transmission Dissemination in Communication Networks Laboratory China Electronics Technology Group Corporation 54th Research Institute China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China State Grid Hebei Electric Power Company China

ISBN: (纸本)9784885523045

HDFS is designed for storing large files, but it suffered performance penalty when storing large amount of small files such as the space occupied by the metadata cause high consumption of NameNode and low efficiency of file reading. Currently, there are many approaches implemented to solve the small file problem. In this paper we use additional hardware named SFS (Small File Server) between users and HDFS to solve the small file problem. The proposed approach includes a file merging algorithm based on temporal continuity, an index structure to retrieve small files and a prefetching mechanism to improve the performance of file reading and writing. The experimental results show that the proposed approach efficiently optimizes small files storing in HDFS with reducing the overload of NameNode and improving the performance of file accessing. © 2016 IEICE.

关键词： Middleware

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