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Water Tree Deterioration Diagnosis for 10 kV XLPE cable based on Residual Charge Method

Water Tree Deterioration Diagnosis for 10 kV XLPE cable base...

第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： B.X.Du Z.X.Huo H.B.Li Y.Gao Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China

ISBN: (纸本)9781424443673

XLPE cables are widely used in urban distribution systems because of their excellent mechanical, heat and electrical properties. However, water tree, formed due to the existence of water and intense electric field, is one of the primary causes of aging breakdown. There used to be several methods, such as insulation impedance method and DC leakage current method for the detection of bridged water tree, which are non-effective for the diagnosis of non-bridged one. Residual Charge Method is known for its effectiveness in the diagnosis of non-bridged one. In this paper, pulse voltage is applied to the DC voltage charged XLPE cable after grounding. It is called 'Pulsed-type Residual Charge Method' which is found to be more effective for the diagnosis of non-bridged water tree. The effects of DC voltage, grounding time and pulse voltage on the amount of residual charge are studied. Also, the releasing mechanism of residual charge by pulse is discussed. Accumulated results show that the improved method has a high resolution for the diagnosis of water tree degradation degree.

关键词： XLPE cable water tree Residual Charge Method pulse

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Preventive transient stability control using constrained optimal power flow

Preventive transient stability control using constrained opt...

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8th International Conference on Advances in Power system control, Operation and Management (APSCOM 2009)

作者： Jingang Yang Ka Wing Chan Haomin Ma Peng Zhang Dazhong Fang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China

A new methodology for obtaining the optimal power flow with transient stability constraints is proposed in this paper. The main algorithm decomposes the problem into conventional optimal power flow and optimal control sub-problems, which are solved independently. In the process of optimal control, the transient stability index expressed by semi-infinite dimension constraints is converted into two dimensional inequality constraints by integration of angle and voltage, respectively. The optimal control direction is formed by the gradient of control variables, which is obtained by solving the system trajectory expressed by the differential algebraic equations and trajectory sensitivity expressed by the linear time-dependent dynamic system. Test results on the New England 39-bus power system have verified the effectiveness and reliability of the proposed methodology.

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In-depth investigation of the optimal coordinated voltage emergency control model

In-depth investigation of the optimal coordinated voltage em...

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8th International Conference on Advances in Power system control, Operation and Management (APSCOM 2009)

作者： Fang Zhang Ka Wing Chan Wei Ren Jingang Yang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China

This paper investigates the concerns associated with the previously proposed optimal coordinated voltage emergency control (OCVEC) model. The issues in concern include the influence of control delay on the performance of OCVEC, the effects of parameter errors of load model on the OCVEC performance, and the methodology to select the vulnerable buses being included in the voltage stability performance index. In addition, the computational complexity of OCVEC model is assessed.

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A learning scheme against voltage instability

A learning scheme against voltage instability

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8th International Conference on Advances in Power system control, Operation and Management (APSCOM 2009)

作者： Haomin Ma Ka Wing Chan Wei Ren Jingang Yang Dazhong Fang Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU China

A genetic learning scheme is proposed for coordinated voltage control (CVC). This leaning control combines GA with a long term memory. The optimal search of GA can refine the knowledge in memory. At the same time, stored knowledge can be exploited to improve the search of GA. This learning strategy provides a fast voltage control and the control performance can be improved gradually.

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Dynamical Simulation of laboratory MicroGrid

Dynamical Simulation of Laboratory MicroGrid

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

作者： Yishu Zhao Li Guo Department of Electrical Engineering Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

A micro-grid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control micro-grids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the micro-grid planning structure in Shandong Electric Power Research Institute (SEPRI) and discusses the various feasible control approaches used and presents for micro-grid. Then, based on modeling different types of distributed generations and energy storage equipment, the SEPRI Micro-Grid model was simulated with several operating modes under peer to peer control strategy. The importance of an energy storage to assist stability during transition between the operating modes is emphasized.

关键词： Laboratories Hydroelectric power generation Wind energy generation Power generation Stability Energy storage Wind turbines Fuel cells Topology Power system simulation

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Based on Particle Swarm Optimization and Simulated Annealing Combined Algorithm for Reactive Power Optimization

Based on Particle Swarm Optimization and Simulated Annealing...

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

作者： Zhenshu Wang Linchuan Li Bo Li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China School of Electrical Engineering Shandong University Jinan China Shandong Electric Power Engineering Institute Jinan China

This paper presents a novel combined algorithm based on particle swarm optimization (PSO) and simulated annealing algorithm(SA) for power system reactive optimization. According to the characteristics of PSO and SA, the proposed method which combined PSO and SA efficiently makes good use of easily implementing performance and fast convergence performance of PSO and global convergence performance of SA, and makes them search in phase. This paper detailed explains coding of control variables, selecting of parameters and material steps of combined algorithm for optimizing reactive power. Taking the IEEE 14-bus system, IEEE 57-bus system and IEEE 118-bus system for example, the simulation results demonstrate that the proposed method is simple and easy to implement, and has high computing efficiency and comparing with conventional PSO it can obtain higher quality solutions.

关键词： Particle swarm optimization Simulated annealing Reactive power Power system simulation Reactive power control Power generation Convergence Voltage Optimization methods Laboratories

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A study on VSC-HVDC based black start compared with traditional black start

A study on VSC-HVDC based black start compared with traditio...

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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Sheng Li Mingxia Zhou Zongqi Liu Jianhua Zhang Yinhui Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China Department of Electrical Engineering School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

A good black-start scheme is important and necessary to resume power supply fast and efficiently after black out, and how to choose black-start power is the first thing to consider in the scheme. In this paper, the advantages of VSC-HVDC as black start power are analyzed with contrast to traditional black start power. The ability of VSC-HVDC to soft energize major power system equipment is proved through simulation by software PSCAD/EMTDC. Simulation waveforms during soft energization are illustrated. These plots have described the good voltage and frequency characteristics of VSC-HVDC. The transition from one control mode of VSC to another is also discussed. Simulation results indicate that by using soft energization, VSC-HVDC is an ideal black start power.

关键词： Converters Power conversion PSCAD Power system harmonics Power system simulation Power system restoration Voltage control Power system transients Frequency Transformers

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Routing Protocol for Wireless Sensor Networks in Home Automation

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IFAC Proceedings Volumes 2009年第3期42卷 27-33页

作者： Xiao Hui Li Hong Qin Xu Seung Ho Hong Zhi Wang Xiang Fan Piao Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education Wuhan University of Science and Technology Wuhan Hubei 430081 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China Department of Electronics Information and System Engineering Hanyang University 425-791 Korea Department of Electronic Information Engineering College of Science and Engineering Yanbian University Yanji 133002 China

Home automation systems based on wireless sensor/actuator networks are characterized by diversity of node power sources, limited computational power, and mobility. We propose a routing protocol that fully uses the location of static nodes to limit the search for a route to a small zone based on the analysis of characteristics and requirements. The calculation of two different kinds of zone and the route discovery procedure are described in this paper. According to the environment of home automation, we compared the performance of our routing protocols with the ad-hoc on-demand distance-vector protocol using simulation and gave suggestions for zone selection. Simulation results showed that our routing protocol dramatically reduced the routing overhead and increased the reliability.

关键词： Wireless Sensor/Actuator Networks Home Automation Routing Protocol

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Robust controller Design for Networked control systems with Nonlinear Uncertainties

Robust Controller Design for Networked Control Systems with ...

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2009 American control Conference (ACC 2009)

作者： Junyan Yu Long Wang Mei Yu Jie Chen Yingmin Jia Intelligent Control Laboratory Center for Systems and Control College of Engineering and Key Laboratory of Machine Perception (Ministry of Education) Peking University Beijing 100871 P.R.China Department of Automation North China Electric Power University Zhuxinzhuang Dewai Beijing 102206 P.R.China Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing 100081 P.R.China Seventh Research Division Beihang University Beijing 100083 P.R. China

ISBN: (纸本)9781424445233

We address robust stabilization problem for networked control systems with nonlinear uncertainties and packet losses by modelling such systems as a class of uncertain switched systems. Based on theories on switched Lyapunov functions, we derive the robustly stabilizing conditions for state feedback stabilization and design packet-loss dependent controllers by solving some matrix inequalities. A numerical example and some simulations are worked out to demonstrate the effectiveness of the proposed design method.

关键词： Networked control systems robust controller design Packet loss control systems design approach Switched systems controller design State feedback Uncertainty nonlinearity

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Study of assembly line dynamic balancing based on simulation

Study of assembly line dynamic balancing based on simulation

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International Technology and Innovation Conference 2009 (ITIC 2009)

作者： Hongjun Wang Hongfeng Wang Huaicun Zhang School of Mechanical and electronic Engineering Beijing Information Science and Technology University Beijing China Key Laboratory of Modem Measurement & Control Technology Ministry of Education Beijing China Yantai Economic Technology Development Zone Yantai China

An assembly line balancing method based on Genetic algorithm (GA) and visual simulation is proposed for the assembly line dynamic balancing in order to take into account more factors in addition to the implicit factors. Firstly, the assembly line virtual digital model is created based on systematic layout planning (SLP). Secondly, the GA for solving assembly line dynamic balancing is presented on the conditions that minimize the number of stations and the tasks assigned to a set of workstations with the same cycle time. In the view of assembly line visual modelling and simulation, the visual simulation based on eM-plant is adopted. This system framework and simulation process is discussed. The assembly line balancing system is developed based on the object-oriented language VC++6.0 with the access database. The gear-box assembly line case is studied by using this system. The results showed the method is valid and effective. It can be used to provide the technology support for improving the production efficiency and redesigning the assembly line for the manufacturing plant.

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