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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Dong, Xinzhou Wang, Jun Shi, Shenxing Wang, Bin Dominik, Bak Kirby, Brian Yang, Xia State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 10084 China Alstom Grid Stafford ST174LX United Kingdom

ISBN: (纸本)9781849198349

It is very difficult to correctly identify single-phase-to-ground fault (SFG) in distribution system with neutral non-effectively grounded (NNG). A novel travelling wave based singlephase-to-ground protection is proposed in the paper. The polarity of initial transient current and voltage travelling waves are used to identify the fault direction, and power frequency voltages are used to distinguish SFG from phaseto- phase fault to ensure the reliability of the protection. In the paper, wavelet transforms and module maxima theory was adopted to represent the polarity of travelling waves effectively and construct protection algorithm,. The analysis and simulation demonstrate that the protection is valid.

关键词： Wavelet transforms

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Modeling and Verification of Steering Torque Feedback System for Driving Simulator

Modeling and Verification of Steering Torque Feedback System...

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IEEE International Conference on Intelligent Transportation Systems

作者： Yuyao Jiang Weiwen Deng Sumin Zhang Hang Zheng State Key Lab. of Automotive Simulation & Control Jilin Univ. Changchun China

ISBN: (纸本)9781479960798

I. Introduction For driving simulator, steering torque feedback is one of the most intuitive and important factors for driver to acquire road feel. The widely used method in the state of the art is based on a dynamic steering torque feedback model. This model takes into consideration of not only many influencing factors such as tire forces, power assist torque, but in particular, the dynamic attributes of a steering system inself, including inertia, damping and compliance, friction, etc. While all these play important roles on the characteristics of the steering torque feedback, little has been studied on the way and the mechanism as how each of these external factors and internal attributes affects the steering torque feedback individually and collectively [1] [2] [3]. The proposed research in this paper is to investigate the effects on the steering torque feedback mainly due to the dynamic attributes of the steering system itself, and to develop more insight on the contributing mechanism with its inertia effects, damping and compliance effect, and effects due to various types of friction, etc. The aim of this research is to improve not only the accuracy of the steering torque model for applications such as driving simulators, but also the design and performance of a steering system with better torque feedback for application such as electric power steer systems or steer-by-wire systems.

关键词： feedback sensitivity analysis steering systems torque tyres vehicle dynamics driving simulator real vehicle experimental result steering torque feedback formulation steering torque feedback model steering torque feedback system tire reactive torque model Force Friction Steering systems Tires Torque Vehicles Wheels

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Trajectory Planning for Vehicle Autonomous Driving with Uncertainties

Trajectory Planning for Vehicle Autonomous Driving with Unce...

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2014 International Conference on Informative and Cybernetics for Computational Social Systems(ICCSS2014)

作者： Hao Sun Weiwen Deng Sumin Zhang Shanshan Wang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Technical Center of Dongfeng Motor

This paper proposes a novel method on dynamic trajectory planning for intelligent vehicle driving under traffic environment with *** statistical characteristics of traffic vehicle motion are first analyzed with a traffic vehicle model,in which the inputs are considered to be random variables with certain probability *** the output of the model can be calculated via unscented transformation for probabilistic *** the overall collision probability of the candidate trajectories is assessed with certain confidence *** a trajectory planning method is employed to achieve multiple objectives for lane change maneuver with combined efficiency and *** is conducted with results demonstrating that the proposed method is valid and effective.

关键词： autonomous driving uncertainties trajectory planning

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A Lane Departure Warning System Developed under a Virtual Environment

A Lane Departure Warning System Developed under a Virtual En...

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2014 International Conference on Informative and Cybernetics for Computational Social Systems(ICCSS2014)

作者： Ye Wang Weiwen Deng Sumin Zhang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Technical Center of Dongfeng Motor

In recent years,many advanced driver assistant systems(ADAS)are developed to address great concerns on vehicle ***,the testing and verification of ADAS can be very time consuming,costly and even *** paper presents a vision-based lane departure warning system(LDW)that is developed under a virtual *** lane departure warning system consists of an image processing module and a pre-warning *** LDW system in this paper is not novel or creative,it’s just a object to show how a LDW system can be developed ender a virtual *** LDW system is largely developed under a real-time virtual environment that includes two d Space1401-based Micro Autoboxes(MABX),a desktop PC,a d Space1006-based real-time simulator,and the required communication *** preliminary simulation has been conducted to verify the proposed camera model and virtual driving environmental model,and the results show that the proposed verification environment is valid and effective.

关键词： LDW Virtual Environment Real Time

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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Characteristics calculation and pattern recognition for partial discharge of cable joint

Characteristics calculation and pattern recognition for part...

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2014 International Conference on Communication Technology and Application, CTA 2014

作者： Xia, Y.F. Gui, J.F. Chen, X.Y. Gao, S.Y. Huang, J.H. Lin, J.H. Dongguan Power Breuse of Guangdong Grid China School of Electrical Engineering Beijing Jiaotong University China Department of Electrical Engineering Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments China

ISBN: (纸本)9781845649302

For PD pattern recognition, six kinds of typical cable fault models are made and tested. Characteristics are calculated from test data. Multiple statistical characteristics of PD distribution map are calculated and pattern vectors are formed. Artificial neural network is trained for recognition. Through the selection and adjustment of characteristics and network parameters, recognition effect with satisfactory result is obtained. © 2014 WIT Press.

关键词： Partial discharges

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A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded

A novel protection scheme for two-phase faults in power dist...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Shi, Shengxing Lei, Aoyu Li, Xin Dong, Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 10084 China Shibei Power Supply Company Shanghai Municipal Electric Power Company Shanghai China

ISBN: (纸本)9781849198349

A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded is presented. The feasibility of tripping single-phase circuit when a phase-tophase or two-phase-to-ground fault occurs is studied with induction motor loads as the focus. The paper at first analyses the effect of a induction motor runs with one phase cut off theoretically. And then a real power distribution system model with 110kV, 35kV and 6kV voltage levels is built in PSCAD/EMTDC. Three feasibility criteria are proposed for motors in continuous operation with single-phase opened. At last, the novel protection scheme is testified in simulation with protection time and reclosing time as variables respectively. The results verify that the scheme is feasible and power supply reliability is improved.

关键词： Induction motors

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Technology and application of online partial discharge monitoring for power equipments 5

Technology and application of online partial discharge monit...

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5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Gao, Shengyou Gui, Junfeng Dept. of Elec. Eng. Tsinghua University State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Beijing100084 China School of Electrical Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9789881532329

Online partial discharge monitoring for power equipments is useful to improve the capacity of the power supply. Main technology for PD testing is introduced in this paper. Advantages and disadvantages of pulse current, UHF, ultrasonic and TEV method are present. The status quo of online PD monitoring is analyzed, and the detection effect of online PD monitoring is not good. Opinions to improve the effect are given. They include built-in sensors, increasing sensitivity and sample rate. Analysis of the state quo indicates that the relevant technical standards and specifications must be revised to improve the normalization and standardization.

关键词： Partial discharges

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Summary of health index theory and application of state maintenance equipment 5

Summary of health index theory and application of state main...

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5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Cheng, Lin Manjun, L.I.U. Peng, Feijin Dept. of Elec. Eng. Tsinghua University State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Beijing100084 China Guangdong Power Grid Company Foshan Power Supply Bureau Foshan528010 China

ISBN: (纸本)9789881532329

This paper describes several methods for condition-based maintenance, introduced CBM, RCM development process, the main theoretical logic, techniques and practices. Focuses on the health index based on equipment maintenance strategies, namely CBRM. Focused on the development of narrative context, theoretical foundation, model healthy index. And for its application in power transformers were introduced.

关键词： Condition based maintenance

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Automatic discovery method of power system critical flowgates considering multiple security themes in power grid

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Dianwang Jishu/Power System Technology 2014年第5期38卷 1169-1174页

作者： Zhao, Feng Sun, Hongbin Tan, Yan Guo, Qinglai Guo, Wenxin State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Guangdong Electric Power Control Center Guangzhou 510600 Guangdong Province China

Based on summarizing the features of selecting critical flowgates in actual power grid, an automatic discovery method of power system critical flowgates considering multiple security themes in power grid is proposed. Based on topological structure of power grid and online power flow, the electric partitioning of power grid is performed and different types of critical flowgates are selected according to different security theme: according to the demand on transient security theme the long-distance transmission channel composed by tie line between electric partitionings is chosen as critical flowgate;according to the demand on thermal stability theme, the transmission channel composed of high voltage transmission lines with high transmission capacity, which interact each other obviously, is chosen as critical flowgate;according to the thermal stability at load side the transmission channel composed of low voltage transmission lines with higher transmission capacity, which interact each other obviously, is chosen as critical flowgate. Taking Guangdong power Grid in China as testing example, test results show that the proposed method considers common security themes in power grid accurately and different kinds of critical flowgates can be attained;the obtained critical flowgates not only conform to a posteriori critical flowgate given by experts in the field of power grid operation, and new critical flowgates can be discovered, besides, the discovery results are reasonable and creditable.

关键词： Thermodynamic stability

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