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Equivalence of stability criteria for time-delay systems

Frontiers of Electrical and Electronic Engineering in China 2010年第2期5卷 207-217页

作者： Haiyun AN Hongjie JIA Yuan ZENG Wei WEI Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin UniversityTianjin 300072China

During the past few decades,there have been a number of new delay-dependent stability criteria based on linear matrix inequalities published in the *** criteria,to some extent,can reduce the *** fact,some criteria are *** this paper,we aim to theoretically establish equivalence of two stability *** was obtained by Sun et al.[Sun et ***:Proceedings of IEEE power&Energy Society General Meeting.2009,1–7]and the other was given by Xu et al.[Xu et *** Transactions on Automatic control,2005,50(3):384–387].Also,we theoretically establish equivalence of the robust stability criterion presented by Jia et al.[Jia et *** of Electric power systems,2010,34(3):6–11]and the one given by Xu et al.(2005).

关键词： delay-dependent stability criterion robust stability time-delay systems linear matrix inequality(LMI)

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Fault diagnosis of direct-drive wind turbine based on support vector machine

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Journal of Physics: Conference Series 2011年第1期305卷

作者： X L An D X Jiang S H Li J Chen State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing 100084 China

A fault diagnosis method of direct-drive wind turbine based on support vector machine (SVM) and feature selection is presented. The time-domain feature parameters of main shaft vibration signal in the horizontal and vertical directions are considered in the method. Firstly, in laboratory scale five experiments of direct-drive wind turbine with normal condition, wind wheel mass imbalance fault, wind wheel aerodynamic imbalance fault, yaw fault and blade airfoil change fault are carried out. The features of five experiments are analyzed. Secondly, the sensitive time-domain feature parameters in the horizontal and vertical directions of vibration signal in the five conditions are selected and used as feature samples. By training, the mapping relation between feature parameters and fault types are established in SVM model. Finally, the performance of the proposed method is verified through experimental data. The results show that the proposed method is effective in identifying the fault of wind turbine. It has good classification ability and robustness to diagnose the fault of direct-drive wind turbine.

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A multi-class pattern recognition method for motor imagery EEG data

A multi-class pattern recognition method for motor imagery E...

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IEEE International Conference on systems, Man and Cybernetics

作者： Yonghui Fang Minyou Chen Robert F Harrison State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China School of Electronic and Information Engineering Southwest University Chongqing China Department of Automatic Control & Systems Engineering University of Sheffield Sheffield UK

The Common Spatial Patterns (CSP) algorithm is useful for calculating spatial filters for detecting event-related desynchronization (ERD) for use in ERD-based brain-computer interfaces (BCIs). However, basic CSP is a supervised algorithm suited only to two-class discrimination; it is unable to solve multiclass discrimination problems. This paper proposes a new method named the binary common spatial patterns (BCSP) algorithm to extend the basic CSP method to multi-class recognition. Our method arranges the spatial filters and Fisher classifiers in the form of a binary tree whereby N - 1 spatial filters and N - 1 Fisher classifiers are calculated for N class recognition. This is fewer than must be calculated in other methods (e.g. one-versus-rest, OVR). This makes the overall classification procedure less redundant. simulation results show that BCSP has better performance than the OVR scheme and outperforms the three best teams in the 2008 BCI-competition.

关键词： Spatial filters Arrays Feature extraction Electroencephalography Band pass filters Covariance matrix Filtering algorithms

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Design of Global power systems Stabilizer to Damp Interarea Oscillations Based on Wide-Area Collocated control Technique

Design of Global Power Systems Stabilizer to Damp Interarea ...

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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang Jie Wu James S. Thorp School of Electrical and Electronic Engineering North China Electric Power University and also with the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University State Nuclear Electric Power Planning Design and Research Institute Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781457710001

This paper develops a systematic procedure of designing global power system stabilizers (GPSSs) based on collocated control to enhance the damping during interarea oscillations. The availability of remote signals from phasor measurement units (PMUs) enables the wide-area control in large scale systems. The closed loop eigenvalues are excluded from a region of the complex plane by the collocated control algorithm guaranteeing that low frequency modes must be damped. The optimum locations for GPSSs were selected using controllability. The damping performance of a 16-machine, 68-bus study system reinforced with GPSSs is examined in the frequency and time domains. The simulation results show that the control scheme is able to damp out interarea oscillations following possible disturbances.

关键词： PMUs Interarea oscillations Collocated control Global power system stabilizers Phasor measurement units absorption of shock dinitrophenyl-aminopropyl-methylamine Oscillations control technology Complex Plane power system stability Computer algorithms

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RETRACTED ARTICLE: The optimal bidding based on the prospect theory

RETRACTED ARTICLE: The optimal bidding based on the prospect...

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Lin, Ji-Keng Wang, Xudong Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

The bidding of generation companies is a risk decision-making process. The prospect theory describes the relationship of the human being risk preference with the expected profit: when the profit is bigger than the expected, most people might prefer to the risk avoidance; when the profit is smaller than the expected, people might incline to the risk preference to attempt to realize the target. A new bidding method based on prospect theory is proposed in the paper. Since the influences of the bidding failure risk and the target of expected profit on the decision cognitive psychology of the generation companies are both taken into account, the bidding strategy gained by the method is more consistent with the generation companies' psychological desire. The results of the examples demonstrate the feasibility of the method proposed. ©2010 IEEE.

关键词： Decision theory

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A study on steady characters of inverter interfaced distributed generation in three phase symmetrical system

A study on steady characters of inverter interfaced distribu...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Jin, Qiang Li, Yong-Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424459407

Recently inverters are all-pervading used as the connective instrument of distributed generations and distributed power system. When inverter interfaced distributed generations are connected to the distribution system, it may bring some new problems on load flow and fault characteristic and protection. The analysis on steady characters of PQ control mode and VF control mode inverter interfaced distributed generation is done when the system is three phase symmetrical. Generally speaking there are limits on power and current in control system for the security of distributed generations and power electronic devices in inverter, so the analysis is more complex. The mathematical analysis on three phase symmetrical system is done and restriction equations are described whether three phase symmetrical fault occurs or not. For the solution of the equation groups expresses the steady state of the system, so the solution of the equation groups is one and only. Then the restriction equation groups are solved. The solution in different areas shows the reason of steady non-linear character of inverter interfaced distributed generations and the simulation shows the conclusion correct. The steady characteristic curves of PQ control mode and VF control mode inverter interfaced distributed generation about voltage and current and power are got from the function of voltage and current and power at the same time. PQ control mode and VF control mode inverter interfaced distributed generation behave similarly but not identically when three phase symmetrical fault occurs in three phase symmetrical system. The disadvantageous influence on protection is analysed by the way. ©2010 IEEE.

关键词： Distributed power generation

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Integral planning for distribution system

Integral planning for distribution system

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Jikeng, Lin Xudong, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

A new integral planning method for distribution system without candidate schemes is proposed in the paper. Transportation model is applied to the load assignation. A two-step optimization strategy is developed to obtain the optimal solution in each sub-region for each scheme of substation-capacity combinations. The proposed method is implemented and tested successfully with one practical urban distributed system. Comparisons are made between the traditional grading planning approach and the new integral planning method, which demonstrates the potential advantage of the method in practice. ©2010 IEEE.

关键词： Grading

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Reliability evaluation for distribution system with distributed generation

Reliability evaluation for distribution system with distribu...

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Jikeng, Lin Xudong, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

Based on the simplification equivalence network, a new reliability evaluation method using the Monte Carlo time sequential simulation for the distribution system with distributed generations (DGs) is presented in this paper. By the zone element failure effect table calculated at the simplification network, the impact of the DGs' stochastic power output, running/failure statuses of the devices and the stochastic capacity of the loads on the distribution system reliability are computed by the Monte Carlo time sequential simulation. With the help of the equivalence network, the ransack processing during the calculation is greatly reduced, and the repetitive failure analysis is avoided. In the stochastic simulation process, the strategy of synchronously sampling for the states of DGs and the network devices is adopted, which increases the precision of the simulation compared with the other methods. The results of the samples demonstrate the validity and practicability of the new method. ©2010 IEEE.

关键词： Distributed power generation

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Nonlinear dynamic characteristic analysis of a vertical mass unbalanced rotor

Nonlinear dynamic characteristic analysis of a vertical mass...

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23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010

作者： An, Xueli Jiang, Dongxiang Liu, Chao Zhao, Minghao State Key Laboratory of Control and Simulation of Power System Generation Equipment Department of Thermal Engineering Tsinghua University Beijing China

ISBN: (纸本)9784883254194

The dynamic properties between torsional and bending vibrations of a vertical mass unbalanced rotor are described. The equation of rotor system motion is obtained by Lagrangian dynamics without considering the external actuating forces and torque, shows coupling effect and nonlinear interaction between the rotor system bending and torsional vibrations. An attempt of theoretical analysis and numerical simulation is made to reveal dynamic characteristics of a rotor system. Theoretical analysis of the rotor dynamic equations based on perturbation theory indicates that at stable state of vibration the coupled effect on the rotor system is nonexistent and the bending vibration becomes equal amplitude with shafting speed at stable vibration state. While the torsional vibration keeps on attenuating until it stops. In addition, the numerical simulation results to the dynamic equations, show that coupled torsional and bending vibrations are induced by mass eccentricity, and coupled effect can only be found in vibration initial state of the rotor system. Other numerical simulation results are consistent with the theoretical analysis.

关键词： Perturbation techniques

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Network reconfiguration at the distribution system with distributed generators

Network reconfiguration at the distribution system with dist...

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2010 International Conference on Life system Modeling and simulation, LSMS 2010 and the 2010 International Conference on Intelligent Computing for Sustainable Energy and Environment, ICSEE 2010

作者： Xiaozhi, Gao Linchuan, Li Hailong, Xue Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin 300072 China

This article proposes a novel model for distribution network reconfiguration to meet current distribution system operating demands. In the model the connection of distributed generators to distribution system is considered, and from the view of the actual operation demands, operating modes are proposed to simulate the load changes and DG fluctuations and can be used to achieve the aim that the network reconfigures only once in a period. Then the binary particle swarm optimization algorithm with dynamic adaptation of inertia weight has been applied to solve the model. A typical example proved the feasibility and validity of the model and the algorithm. © 2010 Springer-Verlag.

关键词： Particle swarm optimization (PSO)

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