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检索条件"机构=China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment"

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Lightning Overvoltage Suppression of power Transformer in UHV GIS by Ferromagnetic Ring

Lightning Overvoltage Suppression of Power Transformer in UH...

引用

第七届亚太防雷国际会议

作者： Xiao Zhang Jinliang He State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Lightning overvoltage protection is of great importance to the safety of UHV *** widely used arresters can only suppress the magnitude of lightning overvoltage but lack efficiency on alleviating the *** practice, insulation failure of UHV transformer is often reported.A new protection method is proposed in this paper using ferromagnetic ring as supplement to arresters to suppress lightning overvoltage in UHV ***, equivalent model based on the characteristic of ferromagnetic material and factual dimension of the ring is established for *** of an actual 1000kV GIS is carried out to thoroughly evaluate the lightning overvoltage suppressing effect of ferromagnetic rings with different materials and structure dimensions.

关键词： ferromagnetic ring lightning overvoltage UHV

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Designation and development of hardware platform for intelligent ter-minal in 126kV smart substation

Designation and development of hardware platform for intelli...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Sun, Tong Wang, Bin Dong, XinZhou Zhang, ShuJian Kang, MingCai Cao, RunBin School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Electrical Engineering and Automation Hefei University of Technology Hefei Anhui 230009 China

ISBN: (纸本)9781424496198

According to the demand of 126kV intelligent switch with intelligent operative box, an intelligent terminal device by using cooperation control of embedded CPU (STM32F103ZET6 ARM) and Field Programmable Gates (Cyclone II EP2C8Q208C8 FPGA), which is up to the IEC61850 standard, is designed in this paper. Research program of the device is discussed. Starting from the modularization structure design, function of each module, circuit design and implementation method were introduced in detail. A hardware platform was established according to the design. Finally, the article confirmed the correctness of the hardware platform primarily through experimental method. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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IEC61850-based information modeling of 126KV intelligent terminals

IEC61850-based information modeling of 126KV intelligent ter...

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2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Zhang, Shu-Jian Wang, Bin Sun, Ming Dong, Xin-Zhou Sun, Tong Cao, Run-Bin Electrical Engineering and Automation Hefei University of Technology Baohe District Hefei 230009 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China

ISBN: (纸本)9781424496198

The stability and reliability of the intelligent terminal's receiving information affects its control of intelligent switch in operation directly. To achieve reliable intelligent communications terminals, with techniques and methods of IEC61850 modeling, the paper completed the 126KVGIS intelligent terminal information model based on the analysis of its information characteristics, and established the hardware platform with data model and logical nodes provided by IEC61850. Thus it has a certain practical significance to promote the standard construction, operation and management of intelligent substation, and lead the digital process of process layer devices. © 2011 IEEE.

关键词： Digital devices

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Communication test and analysis of integrated protection system in digital substation

Communication test and analysis of integrated protection sys...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Wu, TingTing Shi, ShenXing Wang, Bin Zhou, YunHai Dong, XinZhou Liu, Kun Yang, YueLin School of Electrical Engineering and Renewable Energy China Three Gorges University Yichang 443000 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China College of Information and Electrical Engineering CHINA Agricultural University Haidian District Beijing 100083 China

ISBN: (纸本)9781424496198

The development of digital substation provides new opportunity for integrated protection. However, the realization of integrated protection is constrained by serial communication between process level and bay level. Based on developed digital integrated protection and control system platform, the result of a physical simulation test concerning communication system reveals the problem of communication instability and packet loss. In this paper, the impact of GPS exerted on stability of integrated protection is tested and analyzed. Without GPS time setting of Merging Unit(MU) in different bay, the integrated protection system will lose data in one minute after running. With GPS, the communication is stable and reliable, but the time interval between two packets in a cycle is quite long. Since sampling of MU in different bay is synchronized by GPS, the availability of integrated protection system is directly affected by communication of integrated protection in digital substation. © 2011 IEEE.

关键词： Packet loss

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Applicable range analysis of optimized single-terminal fault location algorithm

Applicable range analysis of optimized single-terminal fault...

引用

International Conference on Advanced power System Automation and Protection (APAP)

作者： Tian-xiao Huang Xin-zhou Dong Shen-xing Shi Bin Wang State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

Impedance method and single terminal travelling wave method are analyzed in paper, applicable scope of optimized solution is presented. Impedance method is of high robustness but low accuracy. Single terminal travelling wave method offers high accuracy but poor robustness. Optimized solution combines these two methods together, takes advantages of both methods. It is a great enhancement to single terminal fault location. This paper analyzed theoretical basis of optimized solution, proposed the calculation algorithm of fault location range using impedance method. Analyses of impedance method and single terminal travelling wave method show that the optimized solution is suitable for engineering application. Error analysis is proved correct by simulation.

关键词： Fault location Impedance Impedance measurement Transmission line measurements power transmission lines Frequency modulation Surges

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Research on the process of power flow transferring and its identification method

Research on the process of power flow transferring and its i...

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International Conference on Advanced power System Automation and Protection (APAP)

作者： Kun Liu Xinzhou Dong Bin Wang Shenxing Shi State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

This paper analyzes the general process of power flow transferring and divides it into four parts: 1) the process of first phase selection after fault occurs; 2) the process of selective action at the first time; 3) the process of second phase selection and status confirmation; 4) the process after status confirmation. It points out that the issue of asymmetrical flow transferring is a critical process which must be put emphasis on. Then it proposes a method to identify this process, and discuss different solution methods.

关键词： Circuit faults Fault diagnosis Grounding Voltage measurement Protective relaying Oscillators Impedance

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A novel fault locator for power distribution system with neutral non-effectively grounded

A novel fault locator for power distribution system with neu...

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International Conference on Advanced power System Automation and Protection (APAP)

作者： Shenxing Shi Xinzhou Dong State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

Fault locator for power distribution system with neutral non-effectively grounded should locate phase-to-phase fault and single-phase-to-ground fault respectively. For phase-to-phase fault, the point can be located by power-frequency impedance. However, for single-phase-to-ground fault with limited power-frequency current not more than load current, a novel fault location technology should be developed. The paper will present a practical single-phase-to-ground fault location based on fault generated traveling waves acquired from one phase current transducer and zero sequence current transducer at first. Then implementation of the novel fault locator is proposed including hardware design and software flowchart. At last field tests will be made to verify the feasibility of the fault locator.

关键词： power distribution Fault location Random access memory Impedance Voltage measurement Current measurement

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Single phase grounding fault location based on frequency domain characteristics of fault current

Single phase grounding fault location based on frequency dom...

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International Conference on Advanced power System Automation and Protection (APAP)

作者： Bo Jiang Shenxing Shi Xinzhou Dong Bin Wang State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

This paper studies the fault current frequency spectrum characteristics of single phase ground fault in ungrounded distribution networks, and the fault location method based on it. Firstly, it analyzes the production mechanism of 2 nd major frequency component, and the relationship between the 2 nd major frequency component and series resonance frequency of the faulted line. Secondly, from the perspectives of lumped-parameter circuit, the relationship between 2 nd major frequency component and fault location is deduced. simulation cases are used to confirm the relationship. Last, the impact of load and initial fault phase angle on the 2 nd major frequency component are researched. simulation research proves the feasibility of the fault detection and location method based on frequency domain characteristics.

关键词： Performance analysis Helium Resonant frequency Character recognition

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Research on Characteristics of Surface Electric Field on Transmission Lines under Lightning Stroke

Research on Characteristics of Surface Electric Field on Tra...

引用

第七届亚太防雷国际会议

作者： Zhanqing Yu Zhizhao Li Qian Li Chijie Zhuang Rong Zeng Yong Zhang Yongli Liao State Key Lab of Control and Simulation of Power Systems and Generation EquipmentsDepartment of Elec Department of Mathematical Sciences Tsinghua UniversityHaidian DistrictBeijing 100084China Electric Power Research Institute CSGGuangzhou China

Lightning is a major cause of power interruptions in power transmission *** the Leader Progression Model is an advanced method to evaluate the shielding failure probability of transmission *** the surface electric field on phase conductors and ground wires precisely is important, because the surface electric field has great effect on the upward leader *** this paper, the influence of lightning current and some other factors on surface electric field were analyzed.

关键词： surface electric field transmission lines leader progression model UHVAC

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A multi-class pattern recognition method for motor imagery EEG data

A multi-class pattern recognition method for motor imagery E...

引用

2011 IEEE International Conference on systems, Man, and Cybernetics, SMC 2011

作者： Fang, Yonghui Chen, Minyou Harrison, Robert F. State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD United Kingdom School of Electronic and Information Engineering Southwest University Chongqing China

ISBN: (纸本)9781457706523

The Common Spatial Patterns (CSP) algorithm is useful for calculating spatial filters for detecting event-related desynchronization (ERD) for use in ERD-based brain-computer interfaces (BCIs). However, basic CSP is a supervised algorithm suited only to two-class discrimination;it is unable to solve multiclass discrimination problems. This paper proposes a new method named the binary common spatial patterns (BCSP) algorithm to extend the basic CSP method to multi-class recognition. Our method arranges the spatial filters and Fisher classifiers in the form of a binary tree whereby N - 1 spatial filters and N - 1 Fisher classifiers are calculated for N class recognition. This is fewer than must be calculated in other methods (e.g. one-versus-rest, OVR). This makes the overall classification procedure less redundant. simulation results show that BCSP has better performance than the OVR scheme and outperforms the three best teams in the 2008 BCI-competition. © 2011 IEEE.

关键词： Brain computer interface

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