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An analytical method for studying transient torques

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2010年第7期30卷 70-76页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Deng, Ji-Xiang Xue, An-Cheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping District Beijing 102206 China Electrical Engineering College Northeast Dianli University Jilin 132012 Jilin Province China

Based on the modal series method, the first-order and second-order solutions of torques were deduced. An analytical method was established for analyzing torsional dynamics. It can directly represent torsional dynamics with the physical concepts. The quantitative index was given for analyzing the feasibility of the solutions. Furthermore, the nonlinearity modal indices and contributor factors of torques were defined based on the second-order solutions, and they were used to study the impact of nonlinear modal interactions on the transient torques. The fundamental-mode nonlinearity index describes the effect of nonlinear modal interactions on the initial amplitudes and phase angles of fundamental modes. The combination-mode index represents the strength of interactions between fundamental combination modes and combination modes. The nonlinearity contribution factors embody the contributions of the fundamental and combination modes to the second-order solutions of torques. The IEEE First Benchmark system was adopted to carry out this study, and some new viewpoints were obtained. © Chin. Soc. for Elec. Eng.

关键词： Torque

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Synchronization control in arrays of coupled Lur'e type networks with nonlinear delayed coupling

Synchronization control in arrays of coupled Lur'e type netw...

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Chinese control Conference (CCC)

作者： Tao Li Aiguo Song Shumin Fei School of Instrument Science and Engineering Southeast University Nanjing 210096 China Key Laboratory of Measurement and Control of CSE (School of Automation Southeast University) Ministry of Education Nanjing 210096 China

This paper deals with global synchronization in arrays of coupled Lur'e systems with nonlinear delayed coupling. Together with Krasovskii-Lyapunov functional and Kronecker product technique, two novel synchronization criteria are presented in terms of linear matrix inequalities (LMIs) based on convex combination, in which the conditions are heavily dependent on the bounds of time delay and its derivative. Through employing LMI in Matlab Toolbox and adjusting some matrix parameters in the derived results, we can realize the designing and applications of the coupled systems. The effectiveness of the proposed methods can be demonstrated by one numerical example with simulations.

关键词： Synchronization Couplings Symmetric matrices Delay Chaos Integrated circuit modeling Trajectory

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Framework design for distributed service robotic systems

Framework design for distributed service robotic systems

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Xudong Ma Kun Qian Xianzhong Dai Fang Fang Yan Xing Key Laboratory of Measurement and Control of CCSE Ministry of Education School of Automation South-East University Nanjing China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781424450459;9781424450466

Service robot is one of the most promising industries in the future. Modular framework for designing and implementing a distributed service robot system including robot and intelligent environment is proposed. Components as sensors and actuators of a robotic system are standardized in both hardware and software design, resulting in an abstraction of digital smart devices with certain functions. A unified software platform with a core of Service-Oriented Architecture (SOA) middleware is established for the system. It employs the Player toolkit to access smart devices via drivers and interfaces, and the Web Service technology is introduced for automatic collaboration of smart services according to their functions. An implementation of a home-care service robotic system is described with 2D/3D realistic simulation. Experimental results validate the flexibility and open performance of the proposed demo system.

关键词： Service robots Robot sensing systems Intelligent robots Intelligent sensors Intelligent actuators Service oriented architecture Sensor systems Hardware Software design Middleware

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Chaotic synchronization in RCL-shunted Josephson junctions

Chaotic synchronization in RCL-shunted Josephson junctions

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Chinese control Conference (CCC)

作者： Pingli Lu Ying Yang Ministry of Education Key Laboratory of Complex System Intelligent Control and Decision (Beijing Institute of Technology) Beijing P. R. China Department of Mechanics and Engineering Science Peking University Beijing P. R. China

Chaotic synchronization criteria for a class of dynamical networks with each node being RCL-shunted Josephson junction is proposed in this paper. The proposed algorithms, which are established in terms of linear matrix inequalities (LMIs), guarantee the synchronized states to be global asymptotically stable. In addition, an interesting conclusion is reached that the chaotic synchronization in the coupled whole 3N-dimensional networks can be converted into that of 3-dimensional space.

关键词： Junctions Synchronization Integrated circuits Linear matrix inequalities Josephson junctions Eigenvalues and eigenfunctions Asymptotic stability

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A study based on DC chopper excitation system

A study based on DC chopper excitation system

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International Conference on Computational Problem-Solving (ICCP)

作者： Guofei Zhang Huilin Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education School of Electrical and Electronic Engineering North China Electric Power University Beijing China

A new self-shunt excitation control method has been brought in this paper, which is about how to use DC chopper that is composed with full controlled switch device IGBT to regulate exciting voltage. This new method replaces traditional method which is adopted controlled rectifier by thyristor. Exciting voltage refers from terminal voltage by exciting transformer, and then it goes through uncontrollable rectifier circuit and switches to DC voltage. This DC voltage is used for DC chopper. We can control duty cycle of IGBT to change output voltage and hold terminal voltage steady. In this paper, the conclusion of DC chopper output current proportioned with duty cycle is proved by simulation in PSCAD. And it also proves that it can maintain terminal voltage stability in steady state operation by the control of trigger angle of IGBT.

关键词： Insulated gate bipolar transistors Voltage control Choppers Generators control systems Electrodes Power systems

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Impacts of motor load on the transient stability of the MicroGrid

Impacts of motor load on the transient stability of the Micr...

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World Congress on Intelligent control and Automation (WCICA)

作者： Zhaoxia Xiao Hongwei Fang School of Electrical Engineering and Automation Tianjin Professional University Tianjin China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

Transient stability of a MicroGrid in which the micro sources using the peer-to-peer and master-slave control was investigated. The P-f and Q-V droop control was used for micro sources 1 and 2. And the PQ control was used for micro source 3. The impacts of motor load on the transient stability of the MicroGrid were shown when the motor load starts, load power changes and a three-phase faults happens. And the power sharing between each micro sources and the main frequency supporting are achieved. Simulation results have verified the effectiveness of the proposed control strategy.

关键词： Stability analysis Power system stability Transient analysis Automation Inverters Distributed power generation

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Q impact of load characteristic on dynamic security region of power system

Q impact of load characteristic on dynamic security region o...

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International Conference on Power system Technology (POWERCON)

作者： Zhenbo Cao Ancheng Xue Jin Li Tianshu Bi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education School of Electrical and Electronic Engineering North China Electric Power University Beijing China

DSR (dynamic security region) is one of the direct methods focusing on the transient stability of power system. This paper focuses on the DSRs of power system with different load models, and explores the characteristic of the DSRs of the power system with constant impedance load and motor load. It deduces the algorithm for DSR of power system described with differential algebraic equation, after introducing the theory of DSR for power system with network-reduction model. And then, it presents the mathematical models for the constant impedance load and motor load. Based on the simulation results, it presents the DSRs for the power system with respect to constant impedance load and motor load, respectively. And furthermore, it compares the characteristic of the DSRs of power system with different loads, and summarizes the impact of different loads characteristic on the DSR.

关键词： Power system stability Power system dynamics Linear approximation Stability analysis Induction motors

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Application of Flexible Fuzzy control in Membrane Structure Inflation system

Application of Flexible Fuzzy Control in Membrane Structure ...

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International Conference on E-Product E-Service and E-Entertainment

作者： Qiushuang Liu Xiaoli Xu School of Mechanical & Vehicular Engineering Beijing Institute of Technology Beijing China Key Laboratory of Modern Measurement & Control Technology (Ministry of Education) Beijing Information Science and Technology University Beijing China

ISBN: (纸本)9781424471591

In order to eliminate steady-state errors and chatter caused by quantization error of the conventional fuzzy controller, based on the self-adjustment of quantified proportionality factors fuzzy controller, this paper establishes the flexible fuzzy controller, and can achieve the online parameters self-adjusting function. This method is used in inflation process of pneumatic membrane structure, which enables the inflation process to produce the smooth change in flexible frequency conversion. The results show that the flexible fuzzy logic controller has fast response speed and small steady-state error, meanwhile the parameters change of the controlled object has some flexible adaptability.

关键词： control systems Fuzzy control Biomembranes Atmospheric modeling Steady-state Process control Frequency control

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Condition prediction of flue gas turbine based on Echo State Network

Condition prediction of flue gas turbine based on Echo State...

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International Conference on Natural Computation (ICNC)

作者： Xiao-li Xu Tao Chen Shao-hong Wang Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing China

Echo State Network is one pioneering recurrent neural network with the core structure of a randomly generated and unchangeable reservoir. This paper provides a Condition prediction model of flue gas turbine by applying Echo State Network and makes prediction of the overall vibration value. Compared to Elman neural network prediction model, examples show that Echo State Network has wonderful dynamic characteristics with smaller error and less prediction time. The model has a good performance in non-linear time series prediction, indicating that the model is feasible in the condition prediction of flue gas turbine.

关键词： Turbines Reservoirs Vibrations Artificial neural networks Recurrent neural networks Training Predictive models

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Local entropy difference-fast marching method for leak diagnosis and localization

Local entropy difference-fast marching method for leak diagn...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Ling Zhao Tao Wang Wei Fan Nan Ge Tong Zhao Guangzheng Peng School of Automation Complicated System of Intelligent Control and Decision Key Laboratory of Education Ministry Beijing Institute of Technology Beijing China Department of Engineering Physics Tsinghua University Beijing China

In this paper, an effective technique for leak diagnosis and localization which couples the local entropy difference method (LEDM) to the fast marching method (FMM) is proposed. A computer-based system is described to combine a specific pneumatic circuit with an on-line infrared camera which is used to test the air-tightness of a test vessel. The test object is charged with cryogenic compressed air and its temperature field is acquired by infrared thermography in this system. Then, both the leakage point and its edge can be identified by means of the designed LED-FM method. An experiment is conducted that confirms that the leak diagnosis and localization method presented in this paper is effective in diagnosing leakage points and in extracting accurate leakage edges, in spite of the presence of surface defects.

关键词： Entropy Pixel Image edge detection Level set Cameras Equations Probes

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