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

作者： Jun, Jiang Chongjian, Li Chengsheng, Wang Wei, Duan Pei, Yang Automation Research and Design Institute of Metallurgical Industry Beijing China Hybrid Process Industry Automation System and Equipment Technology State Key Lab China Beijing Aritime Intelligent Control Co. LTD China

ISBN: (纸本)9781479951611

This paper is based on the high power three-level back-to-back converter system with IGCTs as its application platform. Three-phase voltage source rectifier (VSR) space vector PWM (SVPWM) control system using feedforward decoupling control strategy is built in the software of PSIM. When this SVPWM rectifier is in practical control, problems of harmonics and neutral point voltage deviation, as well as starting impulse current occur. After detailed analysis, solutions are provided respectively to each problem. Then a new PWM control method is designed to improve the situation overall. That is to say, this method can effectively eliminate even-order harmonics, balance neutral point voltage and lower the starting impulse current. So the system has a better performance which is proved by PSIM simulations and experimental waveforms. © 2014 IEEE.

关键词： Vector spaces

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Intracerebral hemorrhage (ICH) evaluation with a novel magnetic induction sensor: A preliminary study using the Chinese head model

Intracerebral hemorrhage (ICH) evaluation with a novel magne...

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作者： Zhang, Ziyi Liu, Peiguo Zhou, Dongming Zhang, Liang Lei, Hengdong College of Science National University of Defense Technology Changsha Hunan410073 China State Key Lab. of Complex Electromagnetic Environ. Effects on Electronics and Information System National University of Defense Technology Changsha Hunan410073 China

Biomedical magnetic induction measurement is a promising method for the detection of intracerebral hemorrhage (ICH), especially in China. Aiming at overcoming the problem of low sensitivity, a magnetic induction sensor is chosen to replace the conventional sensors. It uses a two-arm Archimedean spiral coil as the exciter and a circular coil as the receiver. In order to carry out high-fidelity simulations, the Chinese head model with real anatomical structure is introduced into this novel sensor for the first time. Simulations have been carried out upon early stage ICH measurements. By calculating the state sensitivity and time sensitivity of the perturbation phase of two types of sensors using the electromagnetic software, we conclude that the primary signal received can be largely reduced using the novel sensor, which could effectively increase the time and state sensitivity simultaneously. © 2014 - IOS Press and the authors.

关键词： Magnetism

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Research about the power consumption detection technology of charger considering the harmonic and unbalanced current

Research about the power consumption detection technology of...

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2014 International Symposium on Fundamentals of Electrical Engineering, ISFEE 2014

作者： Ke, Zheng Xiaorui, Hu Jing, Ji Kai, Liu State Grid Chongqing Electric Power Corporation Research Institute Chongqing40000 China State Key Lab. of Transmission and Distribution Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400044 China

ISBN: (纸本)9781479968213

In this paper, an electric vehicle charging posts(charger) power consumption detection technology based on harmonic wave and preventing leakage circuit breaker current imbalance technology is proposed. Firstly, for the working characteristics of electric vehicle charging posts, by studying harmonic characteristics produced by electric car charging posts, this paper analyzes harmonic effects on power measurement. And based on the Fast Fourier Transform (FFT) principle, the harmonic energy measurement method of car charging posts is studied. Since each phase current of charging post imbalance, to prevent the sum of each phase current vector of charging posts over the protection current threshold and the charging post breaker misusing in power circuit, preventing leakage circuit breaker current imbalance system is designed. Finally, this paper studies the power consumption detection methods of electric vehicle charging posts, and designs charging post power metering device. © 2014 IEEE.

关键词： Electric power utilization

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A Flight-Test Information Reasoning system Combining Textual CBR and RBR Approaches

A Flight-Test Information Reasoning System Combining Textual...

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7th International Conference on intelligent systems and Knowledge Engineering, ISKE 2012

作者： Yang, Bo Wang, Guodong Yao, Wentao State Key Laboratory of Intelligent Technology and Systems Tsinghua National Lab. for Information Science and Technology Dep. of Computer Science and Tech. Tsinghua University 100084 Beijing China Shenyang Aircraft Design and Research Institute 110031 Shenyang China

This paper presents a reasoning method based on the combination of Textual CBR and RBR to deal with the case described by the natural language with the intention of resolving the information retrieval in the flight-test procedure. Then experiments are made by using the reasoning system based on the method. The results show that not only could the method retrieve the cases from the system correctly, but also the Textual CBR procedure could complement the RBR procedure when the latter one cannot retrieve the case correctly. Thus the method could efficiently increase availab.lity of the reasoning system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Case based reasoning

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An electrical energy meter for electric vehicle charging machines based on FFT and wavelet analysis

An electrical energy meter for electric vehicle charging mac...

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2014 International Symposium on Fundamentals of Electrical Engineering, ISFEE 2014

作者： Fuping, Zhao Rongmei, Liu Bei, He Yan, Hui Electric Power Research Institute Chongqing Power Company ChongQing400044 China State Key Lab. of Transmission and Distribution Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400044 China

ISBN: (纸本)9781479968213

More and more electric vehicles have been used in China, and many charging station has been built in China. Due to the reactive power loss caused by charging devices, the method to measure the power consumed by charging device is critical for power *** on impact loads generated by electric vehicles to the grid in fast charging mode, this paper studies the energy measurement method of electric vehicle charging mode. By comparing the fast Fourier transform and wavelet analysis algorithms, an electric energy measurement device of electric vehicle charging machine based on FFT and wavelet analysis are proposed. Combined with fast data processing functions of DSP, the device can quickly and accurately measures electric vehicles charging amounts under different charging modes. © 2014 IEEE.

关键词： Fast Fourier transforms

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The percolation process via a sinusoidal probability modulation

The percolation process via a sinusoidal probability modulat...

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2014 IEEE International Conference on Communication Problem-Solving, ICCP 2014

作者： Chen, Chui-Bo Li, Zhi-Peng Chun, Yang Shi, Xiao-Hong Chen, Xiao-Long Yang, Cheng-Cheng State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang471003 China School of Mathematical Sciences University of Electronic Science and Technology of China Qingshuihe Campus of UESTC Chengdu Sichuan611731 China

ISBN: (纸本)9781479942466

How clusters are aggregated have great effect on the function and dynamic of complex network. In this paper, we introduce a percolation transition model which can be described with clusters aggregated probability P(Ci) ∼ sin(αCi/Cmax), where Ci is the size of the cluster, Cmax is the size of the largest cluster and α is disturbance parameter. In this article we introduce continuous, weakly and strongly discontinuous percolation transition underlying different α respectively and reveal the strongly impact of clusters' aggregated probability. By means of numerical simulation, we find that the critical point tc shows periodic variation with increasing α. Besides, we realize that the largest gap is macroscopic when α >10.9π and the distribution of the cluster size at critical point meets the power laws which is the main feature of explosive percolation. © 2014 IEEE.

关键词： Probability

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A new fault diagnosis method based on damped least square QR-factorization algorithm in grounding grid

A new fault diagnosis method based on damped least square QR...

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2014 International Symposium on Fundamentals of Electrical Engineering, ISFEE 2014

作者： Degui, Yao Xiaokuo, Kou Guangjie, Zhu Fan, Yang Feng, Dai Kai, Liu Jiajia, Hu Electric Power Research Institute Henan Power Company Zheng Zhou Henan450000 China State Key Lab. of Transmission and Distribution Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400044 China

ISBN: (纸本)9781479968213

With the development of power system and the constant attention to the security of equipment and personnel, fault diagnosis of grounding grid gets more and more attention. In this paper, a new fault diagnosis method for grounding grid based on damped least square QR-factorization algorithm is presented. Firstly, a magnetic field reconstruction method based on the magnetic field method is presented and then a calculation method for magnetic field above grounding grid is proposed. Afterwards, in order to solve the ill-posed reconstruction equations, a damped least squares QR-factorization algorithm is used. Finally, a simulation example is used to verify the feasibility and accuracy of the algorithm. The simulation results show that the reconstructed magnetic field and actual magnetic field are very close;the reconstruction method can also be used when the original data have some errors. So the magnetic field reconstruction method in this paper can be applied to fault diagnosis of grounding grid. © 2014 IEEE.

关键词： Failure analysis

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Development of single-side magnet array for super paramagnetic nano-particle targeting

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Research Journal of Applied Sciences, Engineering and technology 2014年第15期7卷 3022-3029页

作者： He, Wei Ji, Yongliang Luo, Cong Xu, Zheng State Key Lab. of Transmission and Distribution Equipment and System Security and New Technology The Electrical Engineering College Chongqing University Chongqing 400044 China Children's Hospital of Chongqing Medical University District of Yu Zhong Chongqing 400014 136 Zhong Shan Second Road China

Permanent magnets are interesting for the use in magnetic drug targeting devices. The magnetic fields and forces with distances from magnets have limited the depth of targeting. Producing greater forces at deep depth by optimally designed magnet arrays would allow treatment of a wider class of patients. In this study, we present a design of a permanent magnet array for deep magnetic capture of super paramagnetic iron oxide nano-particles, which consists of an array of 3 individual bar permanent magnet positioned to achieve a reasonably magnitude magnetic field and its gradient within a deeply region. These configurations were simulated with two-dimensional finite-element methods. The super paramagnetic iron oxide nano-particles were adopted Fe3O4 particles with diameter 40 nm by chemical co-precipitation method. Performance factors were defined to relate magnetic field force with mass. The field strength and gradient were measured by a Hall probe and agreed well with the simulations. © Maxwell Scientific Organization, 2014.

关键词： Halbach-like arrays Magnetic drug targeting Magnetostatic application Super paramagnetic iron oxide nano-particles

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Streaming media traffic characterizations analysis in mobile Internet

Streaming media traffic characterizations analysis in mobile...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Hongyan Cui Jia Wang Fangfang Sun Yunjie Liu Kwang-Cheng Chen Key Lab. of network system architecture and convergence Beijing University of Posts and Telecommunications State Key Lab. of Networking and Switching Technology Department of Electrical Engineering National Taiwan University

ISBN: (纸本)9781479964123

In spite of great efforts to expand the network infrastructure, it is still hard to catch the rapid growing need to serve tremendous subscribers with significant traffic. To effectively allocate the resource among mobile telecommunication operators and Internet Service Providers (ISP), grasping the highly dynamic traffic patterns can enable effective network planning and optimization for state-of-the-art mobile Internet. We employ traffic behavior analysis method to analyze and model the Internet traffic. Due to the subscribers' number of streaming media accounting over 60% of the entire traffic, we conduct a complete study to analyze this kind of traffic. By contrast, we also give the analysis result of another application, Instant Message (IM). Applying our newly proposed clustering methodology, we describe the regional characteristic of applications. This research subsequently enables more subtle and efficient mobile Internet operating modes to benefit operators and ISPs.

关键词： Streaming media IP networks Mobile communication Internet Cities and towns Servers Wireless communication

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Implementation and test of human-operated and human-like adaptive impedance controls on Baxter robot

Implementation and test of human-operated and human-like ada...

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15th Annual Conference on Advances in Autonomous Robotics systems, TAROS 2014

作者： Liang, Peidong Yang, Chenguang Wang, Ning Li, Zhijun Li, Ruifeng Burdet, Etienne Centre for Robotics and Neural Systems School of Computing and Mathematics Plymouth University United Kingdom MOE Key Lab. of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology China State Key Laboratory of Robotics and System Harbin Institute of Technology China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Department of Bioengineering Imperial College of Science Technology and Medicine London United Kingdom

ISBN: (纸本)9783319104003

This paper presents an improved method to teleoperate impedance of a robot based on surface electromyography (EMG) and test it experimentally. Based on a linear mapping between EMG amplitude and stiffness, an incremental stiffness extraction method is developed, which uses instantaneous amplitude identified from EMG in a high frequency band, compensating for non-linear residual error in the linear mapping and preventing muscle fatigue from affecting the control. Experiments on one joint of the Baxter robot are carried out to test the approach in a disturbance attenuation task, and to compare it with automatic human-like impedance adaptation. The experimental results demonstrate that the new human operated impedance method is successful at attenuating disturbance, and results similarly to as automatic disturbance attenuation, thus demonstrating its efficiency. © 2014 Springer International Publishing.

关键词： Stiffness

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