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The application of numerical analysis method on Hopf bifurcation in power system*

The application of numerical analysis method on Hopf bifurca...

引用

International Conference on Future Wireless Networks and Information systems, ICFWI 2011

作者： You-Jie, Ma Li-Ying, Jia Xue-Song, Zhou Ji, Li Xiao-Shuang, Li Si-Jia, Liu Dept. Of Electrical Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin China

ISBN: (纸本)9783642273254

The problem of determining the Hopf bifurcation point in an autonomous nonlinear system with bifurcation parameters is converted into solve a set of nonlinear algebraic equations, which can be constructed by a semi-analytical method and solved by an iterative numerical algorithm as proposed, according to the necessary and sufficient conditions for existing of Hopf bifurcation. First of all, the eigen-polynomial of Jacobian matrix of the system can be decomposed into product of two parts under the condition for existing of Hopf bifurcation. And then, the coefficients of the eigen-polynomial can be decided though the semi-analytical method by using the relations of the coefficients and the elements of Jacobian matrix, and deducing the conditions which should be decided by the coefficients at Hopf bifurcation point. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. And last, the nonlinear equation set is solved by using Newton2Raphson iterative method. The proposed method can determine both Hopf bifurcation point and the pure imaginary eigenvalue pair of the Jacobin matrix of the system at the same time, thus avoiding the shortcoming for repeatedly solving the eigenvalue problems for every change of the chosen parameters as in some other existing methods. The proposed method is feasible and effective which is illustrated in General Electric Power systems. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Iterative methods

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Hybrid automata modeling and simulation for single-phase shunt APF

Hybrid automata modeling and simulation for single-phase shu...

引用

International Conference on Future Wireless Networks and Information systems, ICFWI 2011

作者： Xue-Song, Zhou Cheng-Wen, Tian You-Jie, Ma Sheng-Ming, Li Si-Jia, Liu Department of Electrical Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Nankai District Tianjin300384 China

ISBN: (纸本)9783642273254

Active power filter (APF) is a typical hybrid dynamic system. And the accuracy of its model directly affects the understanding of the movement laws and the design performance of the controller. According to hybrid automata modeling theory, partition of the state space in single-phase shunt APF movement is analyzed in this paper. Then the hybrid automaton model is established. The model can accurately reflect dynamical motion characteristics of the single-phase shunt APF. Simulation results illustrate the effectiveness and validity of the proposed mode. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Automata theory

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String stability of heterogeneous leader-following vehicle platoons based on constant spacing policy

String stability of heterogeneous leader-following vehicle p...

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IEEE Symposium on Intelligent Vehicle

作者： Xiang-Gui Guo Jian-Liang Wang Fang Liao Rodney Swee Huat Teo Tianjin Key Laboratory for Control Theory & Applications in Complicated System Tianjin University of Technology Tianjin China School of Electrical and Electronic Engineering Nanyang Technological University Singapore Temasek Laboratories National University of Singapore Singapore Temasek Laboratories National University of Singapore Singapore SG

ISBN: (纸本)9781509018222

This paper is concerned with a leader-follower problem for a heterogeneous vehicle platoon subject to external bounded unknown acceleration disturbances. Distributed controller based on sliding mode control (SMC) approach are designed for the second-order follower-vehicles under the common assumption that the initial spacing and velocity errors are zero. The constant spacing policy known to have high traffic density and thus have high traffic flow is applied to design distributed controller. In addition, adaptive compensation technique is applied to compensate the time-varying effect of external disturbances. It is worth mentioning that the upper and lower bounds of the disturbances are not required to be known in advance. Furthermore, with the help of an explicitly constructed Lyapunov function, it is proved that the string stability of the vehicle platoon can be guaranteed. At the same time, the reduction of the chattering in sliding mode is achieved by introducing continuous function in control. Finally, a numerical example is given for illustration.

关键词： Vehicles Numerical stability Safety Stability analysis Acceleration Sliding mode control Lyapunov methods

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An overview on impacts of electric vehicles integration into distribution network

An overview on impacts of electric vehicles integration into...

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IEEE International Conference on Mechatronics and Automation

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

ISBN: (纸本)9781479970995

Due to the increasing concerns about the energy crisis and the environmental problems, electric vehicles (EVs) have been regarded as the future trend. Market penetration of EV has been increasing drastically in the recent years. Large-scale EVs charging has become a practical problem in the grid operation and planning of the distribution network. It might have great impacts on the system performance, such as overloading, reducing efficiency, deteriorating power quality and increasing power system losses. This paper briefly discusses the impact of the charging on the distribution system, the factors of causing the influence and the charging control methods that reduce the impacts on the distribution network.

关键词： Batteries Dispatching Harmonic analysis Planning Electric vehicles Power quality Load modeling

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An overview on smart distribution grid

An overview on smart distribution grid

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IEEE International Conference on Mechatronics and Automation

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

ISBN: (纸本)9781479970995

To accommodate more DGs (distribution generations) and improve power supply reliability, the concept of SDG (smart distribution grid) has been raised. This paper covers the concept of smart distribution gird and briefly introduces the necessity to develop SDG from the aspects its social benefits, economic benefits and influence to the distribution grid. As the new forms of the SDG, micro grid (MG) and active distribution network (ADN) are analyzed and compared with each other. Finally, the some technologies and practical problems about SDG are discussed. By incorporating with new technologies like Big Data and Internet of Things, SDG is prone to obtain a new opportunity to develop.

关键词： Smart grids Companies Reliability Automation Power system reliability Investment

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The design of a DeviceNet - SPI converter module based on the STM32 MCU

The design of a DeviceNet - SPI converter module based on th...

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IEEE International Conference on Mechatronics and Automation

作者： Shuo Sun Jianyun Ni Zaiping Chen Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479970995

According to the characteristics of the STM32 technology and DeviceNet fieldbus, this paper designs a DeviceNet - SPI converter module. The converter module solves the problem of conversion between the DeviceNet fieldbus and the SPI protocol, making the equipment with SPI interface have the communication function of DeviceNet fieldbus through the converter module, at the same time making up for the shortcomings of SPI protocol with no response mechanism. The converter module is introduced the design in detail from the hardware to software and the building of experimental platform to test the design of the system in this paper. Besides, the paper contains testing and verifying the feasibility and reliability of the converter module through the analysis of the results.

关键词： Protocols Microcomputers Hardware Testing Power conversion Transceivers Instruments

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The overview of energy storage technology

The overview of energy storage technology

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IEEE International Conference on Mechatronics and Automation

作者： Xuesong Zhou Yitong Lin Youjie Ma Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479970995

Power storage technology serves to cut the peak and fill valley, regulate the power frequency, improve the stability, and raise the utilization coefficient of the grid in the power system. This paper introduces various types of storage technology such as superconducting magnetic energy storage, super capacitor energy storage, sodium sulfur battery, lithium ion, flow battery technology, and discusses their advantages and disadvantages. The development trend and the different applications of storage technology in the power system are also summarized. This paper concentrates on the energy storage technologies as a cost effective technique that can be used to make the grid more efficient, stable and reliable. Classification of energy storage technologies, comparison of various energy storage devices and system requirements are addressed in this paper.

关键词： Batteries Capacitors Lithium Hydrogen Power system stability Hybrid power systems

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An overview on harmonic elimination

An overview on harmonic elimination

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IEEE International Conference on Mechatronics and Automation

作者： Zhiqiang Gao Yunzhi Qiu Xuesong Zhou Youjie Ma Key Research Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479970995

As the distributed network technology develops, so do the grid harmonic problems, which were mainly caused by extensive using of power electronic devices and nonlinear loads. As far as the harmonic elimination, the filter which had been used widely can improve power quality of the network effectively. But when it comes to the micro grid, new challenge appears. What is more, the new methods used to analyze this new problem still have deficiencies.

关键词： Power harmonic filters Harmonic analysis Active filters Power filters Power grids Power electronics

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Power transformer fault diagnosis based on multi-class multi-kernel learning relevance vector machine

Power transformer fault diagnosis based on multi-class multi...

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IEEE International Conference on Mechatronics and Automation

作者： Jinliang Yin Xuesong Zhou Youjie Ma Yanjuan Wu Xiaoning Xu Tianjin Key Laboratory of Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479970995

Diagnosis of potential faults concealed inside power transformers is the key of ensuring power system safety. The existing transformer diagnosis methods only infer based on single informative data and it is difficult to detect transformer faults more correctly. In this paper, fault diagnosis based on multi-class multi-kernel learning relevance vector machine (MMKL-RVM) is proposed which can integrate the informative data that can indicate the existence of fault. MMKL-RVM achieves sparsity without the constraint of having a binary class problem and provides probabilistic outputs for class membership instead of the hard binary decisions given by the traditional SVM. Most importantly, MMKL-RVM enables informative integration of possibly heterogeneous informative data or feature spaces in a multitude of ways, from the simple summation of feature expansions to weighted product of kernels. Additionally, Genetic Algorithm (GA) combined with K-fold Cross Validation (K-CV) method is adopted to optimize the kernels parameters in order to enhance the performance of the MMKL-RVM. Experimental results show that MMKL-RVM is capable of more excellent diagnosis accuracy to BP neural network and SVM.

关键词： Kernel Power transformers Support vector machines Gases Fault diagnosis Mathematical model Accuracy

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The overview on the Photo-voltaic system

The overview on the Photo-voltaic system

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IEEE International Conference on Mechatronics and Automation

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

ISBN: (纸本)9781479970995

Nowadays, with the situation of energy crisis, Photo-voltaic has drawn the attention of the world. As a new clean energy, Photo-voltaic has its own advantage and as the technology of PV grows, so do the problem connected with its shortcomings. This paper makes a brief introduction of the research status, the key technologies of the PV system and the tendency in the future.

关键词： Inverters Maximum power point trackers Arrays Topology Voltage control Target tracking

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