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IEEE General Meeting power& Energy Society

作者： Ayorinde Akinnikawe Karen L. Butler-Purry Power System Automation Laboratory of the Electrical and Computer Engineering Department Texas A and M University College Station TX USA

Broadband over power Line (BPL) technology has garnered significant attention lately due to recent advancements in solid state technologies and channel coding schemes. The successful application of BPL technology for in-home automation and networking has led to suggestions of applying BPL in other systems including ships. The application of BPL technology using the Shipboard power system (SPS) as a potential communications network for ship automation systems has been proposed, to achieve recent U.S. Navy ship management concepts geared toward reducing ship manning while improving operational efficiency. This paper presents an analytical model developed to examine the channel response characteristics and estimated throughput capacity of SPS cables. The work used a multiconductor transmission line theory based approach to model the channel response of SPS distribution lines and estimated the channel throughput capacity using a ldquowater-fillingrdquo communication technique. This work found that BPL using the SPS cables has a strong potential for use as a communications network for ship automation systems.

关键词： Channel capacity power systems Communication cables Marine vehicles Communication networks power line communications automation Throughput Solid state circuits Channel coding

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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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On the performance of cognitive access with periodic spectrum sensing

On the performance of cognitive access with periodic spectru...

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2009 ACM Workshop on Cognitive Radio Networks, CoRoNet'09, Co-located with the Mobile Computing and Networking Conference, MobiCom'09

作者： Li, Xin Zhao, Qianchuan Guan, Xiaohong Tong, Lang Center for Intelligent and Networked System Department of Automation Tsinghua University Beijing 100084 China Department of Automation TNLIST Tsinghua University Beijing 100084 China SKLMS Lab. MOE KLINNS Lab. Xi'an Jiaotong University Xi'an 710049 China School of Electrical and Computer Engineering Cornell University Ithaca NY 14853 United States

ISBN: (纸本)9781605587387

The problem of cognitive access of parallel channels occupied by primary users is considered. The transmissions of primary users are modeled as independent continuous-time Markov processes. A secondary cognitive user employs a slotted transmission format and a periodic sensing strategy such that it decides if and where to transmit according to its sensing outcomes. The objective of the cognitive user is to maximize its throughput while satisfying collision constrains imposed by the primary users. Three access policies are analyzed. The optimal access policy is obtained based on a formulation of constrained Markov decision processes. A simple suboptimal memoryless policy is obtained by the use of instantaneous sensing outcome. As an upper bound of the optimal policy, a memoryless policy assuming the access of full channel states is also considered. For a symmetric system, we show that the simple memoryless policy is asymptotically optimal when the collision constraint is tight by proving that the performances of all three policies converge to the same value. Copyright 2009 ACM.

关键词： Continuous time systems

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

作者： Kun Liu Xinzhou Dong Zhiqian Bo State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Stafford UK

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.

关键词： Emergency power supplies Voltage Induction motors power system protection Circuit testing Circuit simulation system testing power system transients Circuit breakers power supplies

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Optimal design and modelling of stand-alone photovoltaic-wind hybrid system with adaptive-fuzzy controller

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Australian Journal of electrical and Electronics engineering 2008年第1期5卷 65-74页

作者： Badejani, S.M.M. Masoum, M.A.S. Kalantar, M. Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran Iran Department of Electrical and Computer Engineering Curtin University of Technology WA Australia

This paper proposes an optimal approach for design of a hybrid photovoltaic (PV)-wind generating system with adaptive-fuzzy controller, which is based on discrete optimisation and energy balance calculations. The total capacity of the renewable system is determined based on estimated annual power consumption, average wind speed and sun radiation. Different structures of each unit are examined, and a discrete cost function is defined and optimised to determine the minimum number of PV and wind units. To improve system reliability under different operating and environmental conditions, a self-adjustable controller capable of maximum power point tracking (MPPT) of PV units and blade angle pitch control of wind turbines is designed, and energy balance calculation is performed. Using reference adaptive tables, the fuzzy controller allocates each decision unit and activates the required number of units in each farm to supply the average demand power. Simulation results are used to show the validity of the design and system behaviour under different environmental and loading conditions. Main contributions are the inclusion of renewable system configurations, capacities, environmental factors and maximum power point tracking in the optimisation procedure, as well as the utilisation of an adaptive-fuzzy controller. © Institution of Engineers Australia, 2008.

关键词： Controllers

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Study of Non-Conventional Instrument Transformer and IEC61850 impact on current differential protection

Study of Non-Conventional Instrument Transformer and IEC6185...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： K. L. S. Shenxing X. Dong Z. Bo State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Tsinghua University Beijing Beijing CN State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Stafford UK

Non conventional instrument transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using phase-locked loops (PLL ) technology.

关键词： Substations Delay effects Ethernet networks Phase locked loops IEC Synchronization Data communication

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City Distribution automation Projects - Economic Justification Aspects

City Distribution Automation Projects - Economic Justificati...

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IEEE General Meeting power& Energy Society

作者： J. Rexline Terese A. Thiagarajan Krishna V. Prasad Ranjeet Vaishnav N.D.R. Sarma Tamil Nadu Electricity Board Chennai India Tata Consultancy Services Limited Chennai India Tata Consultancy Services Limited Mumbai India Power System Automation Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

There have been several automation projects by power distribution utilities across India that have focused on control and monitoring of the primary distribution networks. Distribution control centers have been set up and the primary substations (generally 66/11kV or 33/11kV) are covered by such SCADA systems. Encouraged by the benefits derived out of such initiatives, several Indian utilities have started to explore possibilities of taking automation down to the secondary distribution network. In this paper, the authors describe the economic justification of implementing a distribution control center for Chennai City. The authors step through the implementation of the project and share the experience gained along the way to explain how the project was commissioned successfully and the benefits that were derived out of the same. This paper also discusses the various factors required to be considered while planning a secondary network automation project. The authors also discuss on the potential of using IT technologies to manage the large volume of operational data available from such systems and to integrate the distribution automation systems with enterprise-wide IT systems making it possible to have a near-real time view on the techno-commercial performance of the utility using simple tools.

关键词： Cities and towns Substation automation Automatic control power generation economics SCADA systems Costs Communication system control power distribution computerized monitoring Control systems

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Real-Time Simulation using PC-based Kernels

Real-Time Simulation using PC-based Kernels

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IEEE PES power systems Conference and Exposition, PSCE

作者： Fabian M. Uriarte Karen L. Butler-purry Power System Automation Laboratory of the Electrical and Computer Engineering Department at Texas A and M University USA

National Instruments and The MathWorks, Inc. make PC real-time simulation possible with the use of real-time kernels. In this work, a small three-phase radial power system is modeled and simulated using these real-time environments to determine the feasibility, accuracy, and determinism of boot-loaders as an alternative to costly real-time simulators for smaller systems. Implications and modeling methodologies of simulating the power system in real-time using PCs are discussed providing a discussion at the end comparing both products for the interested public

关键词： Kernel power system simulation power system modeling Real time systems Mathematical model Switches power system reliability Computational modeling Instruments Personal communication networks

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Diakoptics in Shipboard power system Simulation

Diakoptics in Shipboard Power System Simulation

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Annual North-American power Symposium

作者： Fabian M. Uriarte Karen L. Butler-Purry Power System Automation Laboratory of the Electrical and Computer Engineering Department Texas A and M University College Station TX USA

ISBN: (纸本)1424402271

A partitioning scheme for transient simulation of shipboard power systems (SPS) is presented. Using diakoptics, the piecewise transient solution to a ungrounded AC-radial (3phi) ring-bus system is found. Cable tie-lines (floating pi-segments) on the SPS ring are converted to hexagon equivalents by discretization and decoupled via source-transportation, diakoptics, and exploiting mutual-susceptance links. Transient simulation results from circuit simulation (as a whole) and via diakoptics (piecewise) are compared and discussed.

关键词： Diakoptics power system simulation power system transients Computational modeling computer simulation Circuit simulation Mathematical model Analytical models power cables Equations

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power Losses for IGCTs and Diodes in MV Three-level Inverters

Power Losses for IGCTs and Diodes in MV Three-level Inverter...

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International Conference on power Electronics and Drive systems (PEDS)

作者： Yuan Liqiang Zhao Zhengming Yang Zhi Department of Electrical Engineering State Key Lab of Control and Simulation of Power System Tsinghua University Beijing China Department of Frequency-converter and Control System GuoDian NanJing Automation Company Limited Nanjing China

The power-loss models for different switching states of IGCTs and diodes in MV (medium voltage) three-level NPC (neutral point clamped) inverters are presented in this paper. The models, simulation implementation and the revisional experiments on IGCT test platform are described in details. The relation between the power losses and the other elements of the inverter is analyzed and discussed.

关键词： Diodes Switches Pulse width modulation inverters power system modeling Medium voltage Variable speed drives Circuits Cooling Pulse width modulation Snubbers

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