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检索条件"机构=Key Research Laboratory for Control Theory and Applications in Complicated SystemsTianjin"

共 91 条记录，以下是81-90 订阅

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An overview on control methods used in static var compensator

An overview on control methods used in static var compensato...

引用

IEEE International Conference on Mechatronics and Automation

作者： Youjie Ma Tao Zhao Xuesong Zhou Key Research Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China Tianjin University of Technology Tianjin CN

ISBN: (纸本)9781479970995

For analyzing the mechanism about the power systems of additional controllers added in static var compensator(SVC) and obtaining the modern control methods that can be used from the perspective of the engineering application, the mechanism about the power systems of additional controllers added in SVC are introduced. On the basis of researching the theory and application status of nine control methods used in the SVC, the comparisons of control effects between the control methods used in SVC for different control targets are completed. Eventually, from the angle of engineering application and development prospect, several feasible advanced SVC control methods are raised.

关键词： Static VAr compensators Power system stability Stability analysis Pi control Voltage control Robustness

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Rub-impact fault diagnosis of rotating machinery based on Hilbert-Huang transform 12th

Rub-impact fault diagnosis of rotating machinery based on Hi...

引用

IEEE International Conference on Mechatronics and Automation

作者： Yan Zhao Enshu Liu Junchao Zhu Baofeng Zhang Juan Wang Huan Tian Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin China Dagang Oilfield Thermal Power Company Tianjin China

ISBN: (纸本)9781479970995

The rub-impact fault is one of the important faults of the rotating machinery. The rub-impact fault signal may be nonlinear and non-stationary. The Hilbert-Huang transform (HHT) is based on time-frequency signal processing technology, which is suitable for nonlinear and non-stationary signals. In this paper, the HHT transform is used to analyze the time-frequency characteristic of the rub-impact fault signal of a rotor test rig. The velocity sensor is used to measure the vibration signal of the rub-impact fault rotor. The experimental result shows that the HHT transform can effectively detect the rub-impact fault of the rotor, which implies great potential of the HHT transform in the fault diagnosis of rotor system.

关键词： Rotors Vibrations Transforms Time-frequency analysis Signal processing Fault diagnosis

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research on the three-level inverter midpoint potential algorithm based on the charge balance theory

Research on the three-level inverter midpoint potential algo...

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2014 International Conference on Energy research and Power Engineering, ERPE 2014

作者： Huang, Sun Wei Wang, Yue Yu Shi, Jin Tianjin University of Technology Tianjin 300384 China Tianjin Key Laboratory of Control Theory and Applications in Complicated Systems Tianjin 300384 China Architectural Design and Research Institute of Tianjin University Tianjin 300073 China

ISBN: (纸本)9783038351603

In order to achieve high voltage, high-power,two-level inverter need to switch in series which results switch static, dynamic-pressure problems. Three-level inverter solve this problem for its circuit, but this circuit has the midpoint potential imbalances of the DC side, we propose to charge balance theory based on the three-level inverter midpoint potential algorithm to solve the problem, build simulation model to validate the algorithm on the midpoint potential in MATLAB. © (2014) Trans Tech Publications, Switzerland.

关键词： MATLAB

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A research of short trip based on driving cycle

A research of short trip based on driving cycle

引用

2nd International Conference on Advances in Mechanics Engineering, ICAME 2013

作者： Shi, Min Wan, Ren Jun Wei, Ke Xin Tianjin Key Laboratory for Control Theory and Applications in Complicated System Tianjin University of Technology Tianjin 300384 China China Automotive Technology and Research Center Tianjin 300162 China

ISBN: (纸本)9783037858288

This paper chooses short trip to study after comprehensive understanding synthesis of the driving cycle. It introduces the data acquisition and analyzes the advantages of the taxis as test vehicles. Then it preprocesses the original data to make the convenience division of short trip. At last it screenes the candidate short stroke according to the actual conditions. The realization of data preprocessing as well as division and screening of short trip through computers is based on the MATLAB software programming. The results of the short trip can be directly used for the follow-up study and synthesis of the driving cycle. © (2013) Trans Tech Publications, Switzerland.

关键词： MATLAB

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Novel global maximum power point tracking algorithm for PV array under partially shaded conditions

Novel global maximum power point tracking algorithm for PV a...

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2013 International Conference on Mechanical and Electronics Engineering, ICMEE 2013

作者： Zhang, Fang Li, Chuan Dong Wu, Yan Juan Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Electric Power Research Institute of Fujian Provincial Power Co. Ltd Fuzhou 350007 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Industry System Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9783037858103

Under partially shaded conditions, the P-U characteristic of the photovoltaic (PV) array is characterized by multiple peaks. The presence of multiple peaks reduces the effectiveness of the existing maximum power point tracking (MPPT) schemes, which refers only to the tracking of a single peak on the P-U characteristic. This paper proposes a novel method for the global MPPT. The new method starts at the starting voltage which is 80% of the open-circuit voltage of the PV array, and finds the first local maximum power point (MPP) using the perturb and observe (P&O) approach. Then the second search finds the next local MPP based on the P&O approach starting from the new starting voltage, which is determined by increasing the rate of slope of the current line at the first local MPP. The new algorithm follows this searching procedure until the global MPP is found. The new algorithm avoids searching the turning-point voltage between the two local MPP, and the voltage range swept is shortened significantly with the result of fast searching speed. Simulations validates that under partially shaded conditions the proposed new algorithm can track the global MPP with the fast tracking speed and the high precision. © (2013) Trans Tech Publications, Switzerland.

关键词： Open circuit voltage

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research on power flow control of UPFC based on PSASP/UPI

Research on power flow control of UPFC based on PSASP/UPI

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2013 International Conference on Mechanical and Electronics Engineering, ICMEE 2013

作者： Zhang, Fang Chen, Jian Ping Li, Chuan Dong Wu, Yan Juan Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Electric Power Research Institute of Fujian Provincial Power Co. Ltd Fuzhou 350007 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Industry System Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9783037858103

The main objective of power flow control for unified power flow controller (UPFC) is to increase the transmission capacity over the existing transmission corridor or line. This paper presents a practical engineering methodology of embedding the power flow control model of UPFC into the commercial software -- power system analysis software package (PSASP) based on its user program interface (UPI) function. In the proposed methodology, the interface currents of UPFC series side and UPFC shunt side between the UPFC device and the network are used to control the transmission line power flow and UPFC bus voltage, respectively. In UPFC series side, the current of UPFC series branch is calculated from the power target equation of the controlled line. In UPFC shunt side, the shunt reactive current of UPFC is used to control the bus voltage. Simulation results on a practical power system show that the proposed methodology can be efficiently applied to the engineering research and analysis of the real power grid with UPFC with good convergence and only one control parameter needed to be prescribed. © (2013) Trans Tech Publications, Switzerland.

关键词： Electric load flow

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Detection technology of train signal based on loop current acquisition system

Detection technology of train signal based on loop current a...

引用

2012 International Conference on Computer Science and Electronics Engineering, ICCSEE 2012

作者： Zong, Xiaoning Li, Xinzhi Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China Tianjin Design and Research Institute of Electric Drive Tianjin China

ISBN: (纸本)9780769546476

Adopt ARM processor and external hardware circuit to assemble an embeded acquisition system of train signal. This system is complete and reliable. It can accurately measure the signal loop current RMS which will be sent to the monitoring equipment as required at the same time. The computing speed is fast, and the sampling accuracy and speed improves a lot. Sampling can be carried out several times in a half cycle. We take a series of links such as hardware filter, transformers isolation and software filter to process the input signal so that the external interference would be avoided. The system works well to predict the reliability of the signal fault. © 2012 IEEE.

关键词： Mergers and acquisitions

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UART interface design based on DM642 video surveillance system and wireless network module

UART interface design based on DM642 video surveillance syst...

引用

2011 IEEE 2nd International Conference on Software Engineering and Service Science, ICSESS 2011

作者： Zhang, Baofeng Zhang, Kuigang Zhu, Junchao Li, Xinzhi Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China Tianjin Design and Research Institute of Electric Drive Tianjin China

ISBN: (纸本)9781424496969

TMS320DM642(DM642) is a widely used digital media DSP chip. As with no Universal Asynchronous Receiver/Transmitter(UART) provided, it is difficult to communicate with other UART devices,especially in wireless video surveillance *** paper uses on-chip multichannel buffered serial port(McBSP) and enhanced direct memory access(EDMA) to implement UART function based on DM642 and wireless communication module LC6311. The initialization of the McBSP and the data coding/decoding inprocess of transmitting/receiving are discussed in *** method can implement the communication between DM642 and LC6311 with easy program flow and no other devices. It enriches interface function of the DM642 and provides a new interface design for wireless video monitoring system. © 2011 IEEE.

关键词： Digital storage

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Design of CMOS image sensor's initialization based on FPGA

Design of CMOS image sensor's initialization based on FPGA

引用

2011 2nd International Conference on Digital Manufacturing and Automation, ICDMA 2011

作者： Zhang, Baofeng Li, Bo Zhu, Junchao Li, Xinzhi Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China Tianjin Design and Research Institute of Electric Drive Tianjin China

ISBN: (纸本)9780769544557

CMOS image sensor can convert analog video signals into digital video signals, so the initiaLization of CMOS image sensor is essential to image capture and processing system. This paper briefly introduces the specification of I2C bus and working principle of COMS image sensor, then it detailedly presents a new design of I2C bus controller which can initiaLize CMOS image sensor. The I2C bus controller programmed by Verilog hardware description language based on FPGA has three function modules. According to the given block diagram of the I2C bus controller, this paper focuses on analyzing the designing tHought of each module and the transform process of the I2C bus state. Finally, the function of controller is verified according to the simulation test and the initiaLization of COMS Image Sensor is implemented through the hardware cirCuit successfully. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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research on Feature Matching Algorithm Based on Three-dimensional Information Acquisition

Research on Feature Matching Algorithm Based on Three-dimens...

引用

2011 International Conference on Computer Science and Network Technology(2011计算机科学与网络技术国际会议 ICCSNT 2011)

作者： Xiaoning Zong Xinzhi Li Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University Tianjin Design and Research Institute of Electric Drive Tianjin China

Image feature matching in three-dimensional information acquisition technology is an important aspect of machine vision, in order to achieve the real-time and matching robustness requirement, an image registration method based on SURF algorithm is proposed. First construct Hessian matrix based on box-type filter, use SURF algorithm to calculate the information of feature points, then decompose characteristics of feature points and match feature points. Experimental results show that the matching speed of SURF algorithm is 4 times as fast as the SIFT algorithm, greatly improves the real-time and robustness.

关键词： three-dimensional information acquisition SURF algorithm image registration

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