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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang James S. Thorp the State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources the State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University 102206 Beijing China the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781467327275

Inter-area oscillation modes could be changed with the parameters of large scale power system varying. Therefore, complex modal perturbation is proposed to make modal analysis of inter-area oscillations considering uncertainties in this paper. The 1~(st) order perturbation is applicable for the case of small modification of the parameter. However, if the parameter modification is fairly large, the 2~(nd) order perturbation should be used to evaluate the oscillation modes to obtain higher computing accuracy. Firstly, the 2~(nd) order and 1~(st) order perturbation of eigenvalues and eigenvectors are deduced, respectively. Then, modes analysis with the parameter modification is also investigated using the 1~(st) order perturbation and 2~(nd) order perturbation, respectively. Finally, the simulated results of IEEE 16-machine, 68-bus study system demonstrate that 2~(nd) order perturbation has much higher accuracy of modes calculation compared with 1~(st) order perturbation in the case of large modification of parameters.

关键词： Index Terms- Inter-area oscillation Complex modal perturbation 1~(st) order perturbation 2~(nd) order perturbation Computing accuracy Parameter modification perturbation FIRST ORDER OSCILLATION MODES Oscillations Uncertainty power systems

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Terminal Sliding Mode Control of Induction Generator for Wind Energy Conversion systems

Terminal Sliding Mode Control of Induction Generator for Win...

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Annual Conference on IEEE Industrial Electronics Society

作者： Yong Feng Bing Chen Xinghuo Yu Yongmin Yang Department of Electrical Engineering Harbin Institute of Technology School of Electrical and Computer Engineering RMIT University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

ISBN: (纸本)9781467324199

This paper proposes high-order terminal sliding mode control strategies for wind energy conversion systems. Nonsingular terminal sliding mode manifolds and related second-order sliding mode control strategies are designed respectively for the speed controller and the current controllers of the induction generator in a wind energy conversion system. The second-order sliding mode technique is utilized to soften the non-smooth control signal, which can guarantee the actual control signal is continuous and smooth. The simulations are presented to validate the proposed method.

关键词： Mathematical model Turbines Wind energy Equations

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Multi-objective particle swarm optimization for transient secure congestion management

Multi-objective particle swarm optimization for transient se...

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International Conference on Environment and electrical engineering (EEEIC)

作者： Ramin Moslemi Heydar Ali Shayanfar Lingfeng Wng Centre of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran Iran Department of Electrical Engineering and Computer Science University of Toledo Toledo OH USA

Congestion is a condition in power systems operation in which some transmission lines become fully loaded. This problem intervene considerable amount of extra cost and increase burdens of power market participants. To alleviate congestion, the operator of power system pays participants to modify their active power generation or consumer side demand. This change in operating point would put the power system in the peril and the stability margins would drop because of the increase in participation of critical generators and load demand. Considering security margins as secondary function could maintain power system from instability points by restraining participation of generators and demands. In this paper a multi-objective version of particle swarm optimization is employed to find Pareto solutions of novel secure congestion management in which congestion management cost and Corrected Transient Energy Margin are considered as two competing objective functions. The proposed method has been tested on the New-England power system to validate the efficacy of proposed method.

关键词： power system stability Transient analysis Generators Security Stability criteria

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Interval Eigenvalue Analysis of Closed-loop Control for power system Oscillation with Interval Parameters

Interval Eigenvalue Analysis of Closed-loop Control for Powe...

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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang James S. Thorp the State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University the State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University 102206 Beijing China the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781467327275

A method for computing interval eigenvalues of closed-loop system is proposed using interval theory for low-frequency oscillation in power system. Firstly, the closed-loop system state matrix based on interval parameters is deduced, then, the algorithm for estimating the lower and upper bounds of the interval complex eigenvalues using matrix perturbation theory and interval extension theory is proposed. Finally, the results are derived in terms of eigenvalues and left and right eigenvectors of the power system. The simulation results of IEEE 4-generater 11-bus system demonstrated that the proposed method is effective and superiority.

关键词： Index Terms-Interval parameters Interval eigenvalues of closed-loop system Matrix perturbation theory Low-frequency oscillations power system oscillation eigenvalues control ring Closed loop systems low-frequency oscillation power systems perturbation theory Upper bound

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Randomized execution algorithms for smart cards to resist power analysis attacks

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Journal of systems Architecture 2012年第10期58卷 426-438页

作者： Daigu Zhang Xiaofeng Liao Meikang Qiu Jingtong Hu Edwin H.-M. Sha State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Computer Science Chongqing University Chongqing PR China Department of Computer Science University of Texas at Dallas Richardson TX USA Department of Electrical and Computer Engineering University of Kentucky Lexington KY USA

In recent years, the applications of smart cards become wider and wider. Smart cards are used in various areas and play a vital role in many security systems. At the same time, the security issue of smart cards has been more and more important. Smart cards are vulnerable to several attack approaches such as power analysis attacks. In this paper, we propose four novel algorithms to defend against power analysis attacks via randomized execution of programs. The experimental results confirm that the new approaches can even the power distribution of applications in smart cards, which makes smart cards less susceptible to power analysis attacks. Our approaches are general and not limited to a certain application.

关键词： Side channel attack (SCA) power analysis attacks Smart card Randomized execution

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Fast simulation approaches for power fluctuation model of wind farm based on frequency domain

Fast simulation approaches for power fluctuation model of wi...

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IEEE power Electronics and Machines in Wind Applications, PEMWA

作者： Jin Lin Wen-zhong Gao Yuan-zhang Sun Lin Cheng Poul Sørensen State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical and Computer Engineering University of Denver Denver CO USA Wind Energy Division DTU Fotonik Technical University of Denmark Denmark

This paper discusses one model developed by Riso, DTU, which is capable of simulating the power fluctuation of large wind farms in frequency domain. In the original design, the “frequency-time” transformations are time-consuming and might limit the computation speed for a wind farm of large size. Under this background, this paper proposes four efficient approaches to accelerate the simulation speed. Two of them are based on physical model simplifications, and the other two improve the numerical computation. The case study demonstrates the efficiency of these approaches. The acceleration ratio is more than 300 times if all these approaches are adopted, in any low, medium and high wind speed test scenarios.

关键词： Matrix decomposition Wind turbines Wind speed Fluctuations Coherence Computational modeling Wind farms

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Multi-Objective Robust Control Considering Uncertainties for Damping Oscillations

Multi-Objective Robust Control Considering Uncertainties for...

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IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： Jing Ma Tong Wang Zengping Wang James S. Thorp State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)9781457705458

This paper deals with the robust control problem for damping power system low-frequency oscillations considering the uncertainties. In the process of designing the damp controller, uncertain parameters are introduced into perturbation matrix, meanwhile, both the H∞ disturbance depression and the optimal H2 performances of the closed-loop control system are satisfied simultaneously for all allowable uncertainties. To solve the proposed multi-objective optimization problem, linear matrix inequalities (LMIs) are deduced based on the LMI optimization technology to obtain the output feedback controller. Simulation results of 4-machine-11-bus IEEE test system show that the proposed method is effective and robust.

关键词： Robustness Uncertainty Damping Oscillators power system stability Linear matrix inequalities Symmetric matrices

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Hierarchical charging management strategy of plug-in Hybrid Electric Vehicles to provide regulation service

Hierarchical charging management strategy of plug-in Hybrid ...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Shouxiang Wang Liang Han Dan Wang Mohammad Shahidehpour Zuyi Li Key Laboratory of Smart Grid of Ministry of Education the School of Electrical Engineering and Automation Tianjin University Tianjin China Tianjin Electric Power Corporation Tianjin China Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

Plug-in Hybrid Electric Vehicles (PHEVs) can be treated as mobile distributed energy storage units in a power grid. This paper addresses the feasibility of achieving system ancillary services with large-scale PHEV integration. The charging model of single PHEV and the statistic power demand model for charging process of large-scale PHEV are presented. Based on these models, a hierarchical large-scale PHEV charging management strategy with demand response is proposed. The proposed strategy not only meets the requirement of system dispatching but also is customer satisfaction constrained. Several cases are studied to verify the influence of customer satisfaction degree and starting time of charging management control on the potential of PHEVs to provide the auxiliary service adjustment. Simulation results also show that the number of PHEVs involved in the charging management process, which is mostly influenced by the setting of customer satisfaction degrees and the moments when PHEVs plug in the grid, has a great influence on the performance of charging management strategy.

关键词： Batteries Control systems system-on-a-chip power demand Dispatching Simulation Load modeling

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Effect of Load power Factor on Voltage Stability of Distribution Substation

Effect of Load Power Factor on Voltage Stability of Distribu...

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IEEE power and Energy Society General Meeting

作者： Li Lin Junbing Wang Wenzhong Gao State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China Department of Electrical and Computer Engineering University of Denver Denver CO 80210 USA

ISBN: (纸本)9781467327275

In this paper, voltage stability of the distribution substation is analyzed by simulation. It is shown that the operating voltage of the distribution substation bus is cross point of the power grid transmission characteristics and the load reactive power - voltage characteristics. The research results are that in the case of constant load active power, the decrease of the load power factor will have two effects on voltage stability: the first is the rise of reactive power - voltage characteristics of load, while the second is the drop of reactive power - voltage characteristics of power grid. So the combined effect will cause a decline in voltage stability of the distribution substation.

关键词： grid Substation power factor Voltage stability distribution substation Voltage stability Reactive power load power power grids operating voltage

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ℋ ∞ stabilisation of switched linear stochastic systems under dwell time constraints

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International Journal of Control 2012年第9期85卷 1209-1217页

作者： Huang, Ran huangran_asee@*** Lin, Yan Ge, Shuzhi Sam Lin, Zhongwei School of Automation Bejing University of Aeronautics and Aeronautics Beijing 100191 China Institute of Intelligent Systems and Information Technology School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

Based on the determination of a minimum dwell time, this article addresses the problem of characterising a switching strategy for ℋ∞ stabilisation of switched linear stochastic systems with adapted external inputs. Sufficient conditions that assure exponential mean square stability and an ℋ∞ performance index are established by analysing the time evolution of the second-order moment of the state and a recursive dynamic programming inequality, respectively. Alternative conditions are derived for numerical implementations. The proposed method is illustrated by numerical simulations. [ABSTRACT FROM AUTHOR]

关键词： ℋ∞ control dwell time switched systems Wiener process

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