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International Conference on Critical Infrastructures, CRIS

作者： Junqiang Wei Gengyin Li Ming Zhou K L Lo Department of Mathematics North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

In practical power markets, Available Transfer Capability (ATC) is crucial for transmission customers, system operators and power marketers to make a good choice. It is an indication of the expected transfer capability remaining on the transmission network. In order to assure the secure, economic, stable and reliable operation of power systems, the assessment of ATC should be carried out instantly. Most of the existing ATC calculation are mainly focused on AC power systems and based on deterministic techniques. As high performance computing has been extensively used in scientific computation and technology, less work has been done on evaluation of ATC by using parallel algorithm. This paper is dealing with the evaluation of ATC by stochastic parallel algorithm in an AC power system. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of power systems, several statistical indices is presented to evaluate ATC. They are calculated based on Monte Carlo simulation and parallel computing. The system operation states can be simulated by Monte Carlo method, and the parallel algorithm based on MATPOWER (A MATLAB™ Power system Simulation Package) is developed. Case study with an IEEE 30-bus power system is used to verify the presented approach. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method can elapse shorter computation time and it is more effective and practical. Some new attractive issues are suggested at the end.

关键词： Monte Carlo methods Load flow Power system dynamics Uncertainty Parallel algorithms

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Monte Carlo simulation based assessment of available transfer capability in AC-DC hybrid systems

Monte Carlo simulation based assessment of available transfe...

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International Conference on Critical Infrastructures, CRIS

Available transfer capability (ATC) is defined as a measure of the system's capability for transfers of power for further commercial activity, over and above already committed uses. In practical power markets, ATC can provide important information for transmission customers, system operators and power marketers. The assessment of ATC should be carried out to assure the secure, economic, stable and reliable operation of power systems. Most of the existing ATC calculation are mainly focused on AC power system and based on deterministic techniques. As high voltage direct current (HVDC) power distribution systems have been extensively used in modem transmission network, less work has been done on evaluation of ATC in AC-DC hybrid power system. This paper is dealing with the evaluation of ATC for the integration of HVDC link with an AC power system. The mathematical model of ATC for AC-DC hybrid power system is proposed. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of hybrid power systems, several statistical indices are presented to evaluate ATC and they are calculated based on Monte Carlo simulation. States of system operation can be simulated, and the algorithm based on MATPOWER (A MATLAB™ Power system Simulation Package) is developed in the environment of MATLAB 7.5. Case study with a modified IEEE 30-bus AC-DC hybrid power system is used to verify the presented approach. Sequential solution method is employed to deal with the AC-DC power flow. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method is effective and practical. The research achievements are undergoing to transfer to the application in other hybrid power systems with different control style, and some new problems are suggested at the end of paper.

关键词： Load flow Monte Carlo methods Power system dynamics HVDC transmission Hybrid power systems Mathematical model

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A methodology for power quality evaluation in distribution network with distributed generation

A methodology for power quality evaluation in distribution n...

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International Conference on Critical Infrastructures, CRIS

作者： Gengyin Li Zhe Zhang Xiang Li Song Wang Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electrical Engineering Tsinghua University Haidian Beijing China School of Electrical and Computer Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

The issue of power quality in the distribution system is always in sense of the concern. With the high penetration of distributed generation (DG) currently, it tends to be more complicated. This paper presents a new approach to evaluate impacts of the DG on power quality of the distribution network. In the process an objective function will be modeled, which will be solved by the optimization toolbox, in order to calculate the result for the evaluating grade. Furthermore, the results of the overall evaluation will be given via the eigenvalue weighted method. The power quality ranking of each feeder with the distributed generators in the distribution network will be apparent with the given weight of influence caused by DGs divided in forms of energy resource.

关键词： Power quality Generators Indexes Distributed power generation Eigenvalues and eigenfunctions Optimization Voltage fluctuations

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New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

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Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： MEI ShengWei MA Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

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A nonlinear plant control by means of simulator-based foresight control

A nonlinear plant control by means of simulator-based foresi...

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ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009

作者： Zhang, Tao Uchida, Motomiki Nakamura, Masatoshi Department of Automation Tsinghua University Beijing 100084 China Fukuoka Institute of Technology Fukuoka Japan Department of Advanced System Control Engineering Saga University Saga 840-8502 Japan

ISBN: (纸本)9784907764333

This paper proposes a simulator-based foresight control approach for nonlinear plant based on system identification. In the proposed method, as a main part of the simulator-based foresight control system, a simulator of an exact plant model of non-affine nonlinear plant is first constructed. If relative degree of disturbance is smaller than control input, servo type filter will be then installed in series of disturbance line in order to adjust relative degree. Next, a control target equation which defines pole assignment for stable output error convergence is determined. Based on this control target equation, the control input for non-affine type nonlinear plant is generated. In this paper, the control of a boiler was implemented by use of the proposed method. The simulation results verified the effectiveness of the proposed method. © 2009 SICE.

关键词： Simulators

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Yaw control via combined braking and steering 10

Yaw control via combined braking and steering

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2009 10th European control Conference, ECC 2009

作者： Vanek, B. Kulcsar, B. Falcone, P. Balas, G. Computer and Automation Research Institute Hungarian Academy of Sciences Hungary Delft Center for System and Control Netherlands Department of Signals and Systems Chalmers University of Technology Sweden University of Minnesota Department of Aerospace Engineering and Mechanics United States

ISBN: (纸本)9783952417393

Active yaw stabilization for passenger vehicles, following driver yaw rate commands with steer-by-wire and rear break force distribution, is discussed. The problem is solved via a decomposition of the vehicle equations of motion into a static, scheduled tyre characteristics map, and an affine Linear Parameter Varying (LPV) plant. control is provided via a cascade connection of scheduled inverse tyre characteristics and an LPV controller, handling both the nonlinear dynamics an the non-affine tyre characteristics. Excellent tracking results are demonstrated with a high fidelity simulation even in the presence of noise and uncertainty. © 2009 EUCA.

关键词： Equations of motion

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Train regulation for mass transit systems 10

Train regulation for mass transit systems

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2009 10th European control Conference, ECC 2009

作者： Mendes, Wagner E. Mendes, Rafael S. Control System Group Inside the Transport Segment of Alstom São Paulo São Paulo Brazil Department of Computer Engineering and Industrial Automation Campinas State University São Paulo Brazil

ISBN: (纸本)9783952417393

The train regulation problem is of particular importance among the scheduling problems found in mass transit systems, being characterized by trains running in urban regions taking passengers from one location to another. If the desired headway between trains, dwell-times in platforms and running times between platforms are determined and known a-priori, the steady state solution (timetable) can be calculated. However, real systems are subject to disturbances such as passengers preventing doors from closing, mechanical or electrical failures, etc., that can deviate the trains from the steady state. In this context, this work is concerned with the determination of a control law, i.e. a law for the determination of the arrival and departure times of each train on each platform in the system's cycles in order to reestablish and maintain the timetable (reference solution). The proposed control law is based on max-plus algebra concepts. The desired arrival and departure times of each train on each platform are calculated from the last occurrence instants of the system's events and from a set of matrices defined in max-plus algebra. © 2009 EUCA.

关键词： Scheduling

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Construction of a fault tolerance connected dominating set in wireless sensor network

Construction of a fault tolerance connected dominating set i...

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2009 International Conference on Measuring Technology and Mechatronics automation(ICMTMA 2009)(2009年检测技术与机械自动化国际会议)

作者： Peng Zeng Yongzhao Bian Haibin Yu Department of Industrial Control System Shenyang Institute of Automation Chinese Academy of Sciences Department of Mechanical and Electronic Engineering Shenyang Institute of Automation Chinese Academy

In wireless sensor networks, virtual backbone has been proposed as the routing infrastructure to alleviate the broadcasting storm problem and perform some other tasks such as area monitoring. Previous work in this area has mainly focused on how to construct a small virtual backbone for high efficiency, which is modeled as the minimum Connected Dominating Set (MCDS) problem. However, the nodes in the CDS need to carry other nodes' traffic and they are subject to failure. Therefore, it is desirable to construct a fault tolerant CDS. In this paper, we first propose a distributed algorithm to construct a connected dominating set (DACDS). Based on DACDS, we further develop a fault tolerant algorithm (kCDS). We also show our algorithm have better performance ratios and low message complexity.

关键词： wireless sensor network (WSN) virtual backbone connected dominating set (CDS) mazimal independent set (MIS) fault tolerant

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Novel connection scheme of backup power supply adaptive to Distribution Line Non-Communication protection and new criterion for high voltage and large capacity induction motor

Novel connection scheme of backup power supply adaptive to D...

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2009 Asia-Pacific Power and Energy engineering Conference, APPEEC 2009

作者： Liu, Kun Dong, Xinzhou Bo, Zhiqian State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China AREVA T and D Automation Stafford ST17 4LX United Kingdom

ISBN: (纸本)9781424424870

This paper presents a new practical backup power supply connection scheme for Distribution Line Non-Communication protection (DNCP). Simulation tests have been conducted using the Alternate Transient Program (ATP) with respect to a typical single circuit breaker multi-section system. The results prove that the new scheme is able to not only recover the power supply of loads on healthy lines automatically, but also create disturbances in favor of Accelerated Over Current (AOC) criterion. Aiming at the failure of Directional Under Voltage (DUV) criterion derived from high voltage and large capacity induction motor load, a novel criterion using the increment of reactive power is proposed. © 2009 IEEE.

关键词： Induction motors

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Distributed state and unknown input estimation for freeway traffic flow models 10

Distributed state and unknown input estimation for freeway t...

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2009 10th European control Conference, ECC 2009

作者： Luspay, T. Kulcsar, B. Tettamanti, T. Varga, I. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute HAS Kende u. 13.-17 BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands Department of Control and Transport Automation Budapest University of Technology and Economics Bertalan L. u. 2 BudapestH-1111 Hungary

ISBN: (纸本)9783952417393

The paper presents a joint state and unmeasured input estimation technique for a special class of nonlinear second order macroscopic traffic model. The freeway traffic system is transformed into a quasi and affine approximate Lin- ear Parameter Varying (LPV) form. Observer design technique is formulated using off-line optimization problem subjected to Linear Matrix Inequality (LMI) conditions, considering uncertain scheduling parameters. Furthermore, locally designed state estimators are interconnected to cover multiple freeway sections. The elaborated method is validated using real traffic measurements. © 2009 EUCA.

关键词： Linear matrix inequalities

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