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Research on the Impact on Sub-synchronous Resonance Risk from DFIG Number and Series-compensated Degree

Journal of Physics: Conference Series 2018年第4期1087卷

作者： M X Yin H Liu Y H Li W Song Department of Electrical and Electronic Engineering North China Electric Power University Baoding 071027 China State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing 100045 China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Beijing 100045 China

Sub-synchronous resonance (SSR) occurred in the power system with both Doubly Fed Induction Generators (DFIGs) and series-compensated lines. Existing paper discovered the nonlinear relationship of SSR damping and the number of DFIGs. In this paper, the equivalent model of wind farms and series-compensated power system in Guyuan is built in RT-LAB. Based on that model, the SSR characteristics of wind farms in Guyuan area under different DFIG numbers and line parameters are investigated through impedance method. The results show that: 1) The relationship between SSR characteristics and DFIG number is nonlinear in Guyuan area. Under the condition of a given wind speed, there is certain number of DFIGs which will induce worst damping effect. 2) A higher series-compensated degree results in a less stable system.

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system development for micro-electrode assembly of cochlear implant

System development for micro-electrode assembly of cochlear ...

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IEEE International Conference on Real-time Computing and robotics (RCAR)

作者： Shaokui Weng Weibin Rong Zeyang Xia Hao Deng Yangzhou Gan Jing Xiong Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China Key Laboratory of Human-Machine Intelligence-Synergy Systems Chinese Academy of Sciences Shenzhen China State Key Laboratory of Robotics and System Harbin Institute of Technology

ISBN: (纸本)9781467389600

Cochlear Implant is an implantable medical device for severe deafness patients to restore hearing function. The micro-electrode in cochlear implant is directly contacted with the human cochlea for signals transmission, thus its assembly is an important step of cochlear implant production. However, currently micro-electrode is assembled manually and the assembly precision and efficiency are unable to meet the industrial standard. In this paper, an automatic assembly system of micro-electrode for Cochlear Implant was designed. In this system, several mechanical mechanism specially for the micron level parts transmission and assembly were designed, including a wire feeder, a ring transmission mechanism, and a welding mechanism. And combined with the human-computer interaction interface, the effectiveness of the overall performance of the assembly system was verified by experiments.

关键词： Wires Welding Cochlear implants Assembly systems Tungsten Needles Electrodes

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Synchronous SVPWM Over-modulation Method Based on Zero-Sequence Voltage Injection in Locomotive Traction

Synchronous SVPWM Over-modulation Method Based on Zero-Seque...

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European Conference on Power Electronics and Applications

作者： Guibin Li Zedong Zheng Yongdong Li Zhiguo Wang XINJIANG UNIVERSITY Department of Electrical Engineering TSINGHUA UNIVERSITY State Key Laboratory of Power System Tsinghua University

ISBN: (纸本)9781509014101

High speed motor control is a key technology in the locomotive traction system. Because of the limitation of the switching frequency and voltage level in high power inverter, modulation method with high voltage utilization ratio and lower low-frequency harmonics is necessary. In this paper, a novel PWM method equivalent with the traditional SVPWM method is proposed, which is realized by the comparison of zero-sequence voltage injected modulation wave and carrier-waves. The over-modulation and smooth transition to six-step square wave modulation was realized by the adjustment of the modulation wave. Moreover, the synchronous modulation can be applied to reduce low-frequency harmonics by the adjustment of the carrier-wave frequency. The corresponding motor control method including flux-weakening control and current open-loop control are also proposed in coordination with the modulation method. The validity of the proposed method has been verified by both simulation in MATLAB and experiments on an industrial 160kW, 750V experimental platform.

关键词： Locomotive traction SVPWM over-modulation Low switching frequency Zero-sequence voltage injection Synchronous optimal pulse width modulation

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Hydrogen Evolution Reaction: A New Platinum‐Like Efficient Electrocatalyst for Hydrogen Evolution Reaction at All pH: Single‐Crystal Metallic Interweaved V8C7Networks (Adv. Energy Mater. 23/2018)

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Advanced Energy Materials 2018年第23期8卷

作者： Haitao Xu Jing Wan Huijuan Zhang Ling Fang Li Liu Zhengyong Huang Jian Li Xiao Gu Yu Wang State Key Laboratory of Power Transmission Equipment and System Security Chongqing University 174 Shazheng Street Shapingba District Chongqing City 400044 P. R. China Department of Applied Physics Chongqing University 55 Daxuecheng South Road Shapingba District Chongqing City 401331 P. R. China

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The Application Of Variational Mode Decomposition For Diagnosing Rub-Impact Fault Of Dual-Rotor system Based On Acceleration Measurements

The Application Of Variational Mode Decomposition For Diagno...

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The 29th International Congress on Condition Monitoring and Diagnostic Engineering Management

作者： Nanfei Wang Dongxiang Jiang Te Han Yizhou Yang Hongzhi Xu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal EngineeringTsinghua University

ISBN: (纸本)9781510868434

As for aero-engine,it is relatively difficult to obtain the displacement signal,only to measure the acceleration *** the paper,aimed at the dual-rotor system test rig,the rub-impact is simulated and the acceleration signals collected from the bearing pedestal are analysed to extract the rubbing faults' ***-component extraction is an available method for vibration signal analysis of rotary machinery,so a novel method of rubbing fault diagnosis based on variational mode decomposition(VMD) is *** is a newly developed technique for adaptive signal decomposition,which can non-recursive decompose a multi-component signal into a number of quasi-orthogonal intrinsic mode *** the rub-impact fault occurs in the dual-rotor system,the acceleration vibration signals of the dual-rotor system will present amplitude-modulated feature because of the periodic rub-impact between the rotor and the *** is then applied to detect multiple rubbing-caused signatures for rotor-stator fault diagnosis via practical vibration *** using VMD,the rub-impact signal,background signal and noise signal can be separated efficiently and the fault feature of vibration signal of a rotor system with local rub-impact fault can be ***,the VMD method can be applied to the rub-impact fault diagnosis of the rotor systems efficiently.

关键词： Dual-rotor variational mode decomposition rubbing demodulation impact

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Mobility Analysis of A Family of One-dimensional Deployable Mechanisms based on Sarrus Mechanism

Mobility Analysis of A Family of One-dimensional Deployable ...

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IEEE International Conference on Mechatronics and Automation

作者： Xiaoke Song Hongwei Guo Zongquan Deng Rongqiang Liu Bing Li State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang Province China Shenzhen Graduate School Harbin Institute of Technology Shenzhen Guangdong Province China

ISBN: (纸本)9781509023974

Sarrus mechanism and its modified configurations are widely used in space missions as one-dimensional deployable mechanisms. The degree of freedom (DOF) of the classic Sarrus mechanism is analyzed using the modified Kutzbach-Grübler criterion, which is based on screw theory. Inspired by the modified configurations, which has three branches used in high stiffness extendible and retractable mast and four branches used in fold articulated square truss mast, the general form of Sarrus mechanism is obtained. Two novel Sarrus mechanisms are synthesized based on the general form, which expands the configurations of one-dimensional deployable mechanism.

关键词： Sarrus mechanism Deployable mechanism Mobility General form Screw theory

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Comments on “Sidewinding with Minimal Slip: Snake and Robot Ascent of Sandy Slopes”

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机器人 2015年第2期37卷 254-256页

作者： LIU Jinguo GAO Yang WANG Yuechao MA Shugen LUO Yifan State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences STAR Lab Surrey Space Centre University of Surrey Department of Robotics College of Science and Engineering Ritsumeikan University

Marvi et al(Science,2014,vol.346,p.224)concluded a sidewinder rattlesnake increases the body contact length with the sand when granular incline angle *** also claimed the same principle should work on robotic snake *** have evidence to prove that this conclusion is only partial in describing the snake body-sand *** should be three phases that fully represent the snake locomotion behaviors during ascent of sandy slopes,namely lifting,descending,and *** snake body-sand interaction during the descending and ceasing phases helps with the climbing while such interaction during the lifting phase in fact contributes resistance.

关键词：机器人设计工业机器人应用

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Teleoperation Control of Baxter Robot based on Human Motion Capture

Teleoperation Control of Baxter Robot based on Human Motion ...

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IEEE International Conference on Information and Automation

作者： Guangzhu Peng Chenguang Yang Yiming Jiang Long Cheng Peidong Liang Key Lab of Autonomous Systems and Networked Control Ministry of Education South China University of Technology Guangzhou China State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences China State Key Laboratory of Robotics and System Harbin Institute of Technology China

ISBN: (纸本)9781509041039

The traditional 3D human motion capture methods require operators to wear tracking sensors on their body. However, these devices would bring operators much inconvenience. Currently, vision based motion capture systems provide us an alternative approach for motion capture technology. In this paper, based on human kinematics and function approximation technique (FAT), a novel method is presented for the trajectory control of Baxter robot. Each arm of the Baxter robot has seven degrees of freedom. The geometry vector approach is applied to capture human motion trajectory by using Microsoft Kinect sensor. A FAT control system is employed to make the robot follow the trajectory of human motion. The UDP communication protocol is employed to send the reference human joint angle data to the robot. We carry out preliminary experiments on Baxter robot to verify the validity of the control approach and the results demonstrate that the method has achieved satisfactory performance.

关键词： Teleoperation Control Baxter Robot Human Motion Capture

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阿尔泰山地区全新世植被和气候变化（英文）

阿尔泰山地区全新世植被和气候变化（英文）

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中国古生物学会第十二次全国会员代表大会暨第29届学术年会

作者：黄小忠彭卫 Natalia Rudaya Eric C.Grimm 陈雪梅曹现勇张军潘小多刘思丝陈春珠陈发虎 Key Laboratory of Western China's Environmental System(Ministry of Education) College of Earth and Environmental SciencesLanzhou University Kazan State University Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Department of Periglacial Research Institute of Earth and Environmental Science University of Potsdam Department of Earth Sciences University of Minnesota Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Institute of Tibetan Plateau Research Chinese Academy of Sciences School of Geographic Science Nantong University

A comprehensive understanding of the regional vegetation responses to long-term climate change will help forecast earth system *** on a new well-dated pollen dataset from Kanas Lake and a review of published pollen records from in and around the Altai Mountains,the regional vegetation dynamics and forcing mechanisms are *** the Altai Mountains,the forest optimum occurred during 10-7 ka for the upper forest zone and a tree line decline and/or ecological shifts were caused by climatic cooling from around 7 *** the lower forest zone,the forest reached an optimum in the middle Holocene,and then increased openness of the forest,possibly caused by both climatic cooling and human activities,occurred in the late *** the lower basins or plains around the Altai Mountains,the development of proto-grassland or forest benefited from increasing humidity in the middle to late *** Points:A new pollen data set from a large deep lake was used to interpret the regional vegetation and climate of the southern Altai *** vegetation showed different long-term responses to climate change in and around the Altai *** dynamics and their impact on geophysical processes should be incorporated into coupled vegetation-climate models.

关键词： Altai Mountains Kanas Lake Holocene vegetation climate change

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Analysis of underwater locomotion and improvement of FroBot

Analysis of underwater locomotion and improvement of FroBot

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2016 IEEE International Conference on Advanced Intelligent Mechatronics, AIM 2016

作者： Yi, Yang Jianqing, Zhang Han, Xu Maokuan, Chen Lu, Zhang Zhongjing, Zhu School of Automation Beijing Institute of Technology Beijing China State Key Laboratory of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing China Department of Electronic Engineering School of Information Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781509020652

The main characteristic of FroBot is the dual-swing-legs propulsion mechanism, and it is necessary for us to conduct a series of experiments to study its propulsion model, both on land and underwater. As the propulsion of FroBot comes from the interaction force between caudal fins and water when it locomotes underwater, this paper presents an analysis about the propulsion and control of angle Θ. Then a number of underwater hydrodynamic simulations and analysis are also conducted to get a better control in reality. Finally, on the basis of propulsion model and experiments, we present the latest mechanical structure designs and further improvements to eliminate the limitations exposed in the previous generations of FroBot. © 2016 IEEE.

关键词： Propulsion

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