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检索条件"机构=Power System Automation Laboratory of the Electrical and Computer Engineering Department"

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City Distribution automation Projects - Economic Justification Aspects

City Distribution Automation Projects - Economic Justificati...

引用

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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High Performance Control of Three-Phase Three-Level Rectifier under Unbalanced Conditions

High Performance Control of Three-Phase Three-Level Rectifie...

引用

Twenty-Second Annual IEEE Applied power Electronics Conference and Exposition (APEC 07), vol.2

作者： Olorunfemi Ojo Srikanth Konduru Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

In this paper, a new control scheme based on the utilization of the natural variables of the system is proposed for the three-phase three-level rectifier working under unbalanced conditions. The attractive advantage of this controller is the possibility of effective operation under both balanced and unbalanced voltage/line impedance conditions. Unity power factor operation is feasible when the system is balanced and a constant input power can be achieved in unbalanced situation. Simulation results demonstrate the effectiveness of the controller in both the rectifier mode and the inverter mode.

关键词： Rectifiers Impedance Control systems Voltage Capacitors Electric variables control Reactive power power harmonic filters Laboratories Electric machines

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Dielectric Properties of Rapeseed Oil Paper Insulation

Dielectric Properties of Rapeseed Oil Paper Insulation

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2007 Annual Report Conference on electrical Insulation and Dielectric Phenomena, vol.2

作者： Jian Li S. Grzybowski Yanfei Sun Xiaoling Chen State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China Department of Electrical and Computer Engineering High Voltage Laboratory Mississippi State University MS USA

This paper presents the basic physical, chemical and electrical properties of a type of rapeseed oil based dielectric liquid. Dielectric properties including relative dielectric permittivity, dissipation factor, and breakdown voltage of the rapeseed oil paper insulation are presented and also compared with those parameters of mineral transformer oil paper insulation. Moreover, four types of small oil gaps are designed for experiments. These four types of oil gaps include a simple oil gap, an oil gap with a paper-covered high voltage electrode, and two oil gaps with one and two layers of papers, respectively, between the high voltage and grounding electrodes. Both the refined rapeseed oil and the mineral transformer oil are used for the small oil gap experiments. Breakdown properties of the small oil gaps are measured. The analysis results of test data show the differences in dielectric properties between the rapeseed oil paper insulation and the mineral transformer oil paper insulation.

关键词： Petroleum Dielectrics and electrical insulation Oil insulation power transformer insulation Minerals Electrodes Chemicals Dielectric liquids Permittivity Grounding

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Aged Oil-Paper Classification Using Statistical Parameters and Clustering Analysis

Aged Oil-Paper Classification Using Statistical Parameters a...

引用

2007 Annual Report Conference on electrical Insulation and Dielectric Phenomena, vol.1

作者： Feng Zhang Jian Li Ruijin Liao S. Grzybowski State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China Department of Electrical and Computer Engineering Mississippi State University MS USA

The paper presents an aging experiment on oil-paper insulation under electrical and thermal stresses. A total of 55 specimens were placed in a designed oil tank for the accelerated aging experiment. Partial discharges and degree of polymerization of specimens were measured during the aging experiment. A total of 27 statistical operators were used for recognition of aged oil-paper insulation. There were 9 principle parameters extracted from the 27 statistical operators by factor analysis. The PD parameter vectors composed of either the statistical operators or the principle parameters were clustered by two types of clustering analysis methods, the k-mean and hierarchical clustering. The results showed that the hierarchical clustering had more advantages over the k-mean clustering for aged oil-paper insulation classification. The principle parameters can be used to obtain the clustering correctness ratios the same as the statistical operators, even though the number of principle parameters was much less than statistical operators.

关键词： Aging Oil insulation power transformer insulation Partial discharges Fuel storage Dielectrics and electrical insulation Thermal stresses Valves Insulators Copper

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Real-Time Simulation using PC-based Kernels

Real-Time Simulation using PC-based Kernels

引用

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 system Control with an Embedded Neural Network in Hybrid system Modeling

Power System Control with an Embedded Neural Network in Hybr...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Seung-mook Baek Jung-wook Park Ganesh K. Venayagamoorthy Power IT and System Laboratory School of Electrical and Electronic Engineering YONSEI University Seoul South Korea Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

The output limits of the power system stabilizer (PSS) can improve the system damping performance immediately following a large disturbance. Due to non-smooth nonlinearities from the saturation limits, these values cannot be determined by the conventional tuning methods based on linear analysis. Only ad hoc tuning procedures can be used. A feedforward neural network (FFNN) (with a structure of multilayer perceptron neural network) is applied to identify the dynamics of an objective function formed by the states, and thereafter to compute the gradients required in the nonlinear parameter optimization. Moreover, its derivative information is used to replace that obtained from the trajectory sensitivities based on the hybrid system model with the differential-algebraic-impulsive-switched (DAIS) structure. The optimal output limits of the PSS tuned by the proposed method are evaluated by time-domain simulation in both a single machine infinite bus system (SMIB) and a multi-machine power system (MMPS)

关键词： power system control Neural networks Hybrid power systems power system modeling Multi-layer neural network Feedforward neural networks power system simulation power system analysis computing Damping Multilayer perceptrons

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Model Identification for Spinning Reserve Management

Model Identification for Spinning Reserve Management

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Canadian Conference on electrical and computer engineering (CCECE)

作者： Ch. Roethlisberger A.M. Gole U.D. Annakkage G. Andersson Department of Information Technology and Electrical Engineering ETH Zurich Zurich Zurich Switzerland Department of Electrical and Computer Engineering University of Manitoba Winnipeg Canada ETH Zurich Power System Laboratory Zurich Zurich Switzerland

This paper presents a model which facilitates the allocation of spinning reserve in a power network which includes a large HVDC infeed. The basic area control model of the power system is developed and subsequently fine-tuned using a non-linear optimization procedure. The model is then used to evaluate the frequency control performance in the face of a known load forecast considering NERC performance standards

关键词： Spinning power system modeling power system management HVDC transmission Nonlinear control systems power system control power systems Predictive models Frequency control Load forecasting

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Time-varying failure rate extraction in electric power distribution equipment

Time-varying failure rate extraction in electric power distr...

引用

International Conference on Probabilistic Methods Applied to power systems (PMAPS)

作者： Jong-Fil Moon Jea-Chul Kim Hee-Tae Lee Sang-Seung Lee Yong Tae Yoon Kyung-Bin Song Power System Laboratory Korea Electrical Engineering and Science Research Institute Seoul South Korea Department of Electrical Engineering Soongsil University Seoul South Korea School of Electrical Engineering and Computer Sciences Seoul National University Seoul South Korea

Reliability evaluation of power distribution system is very important to both power utilities and customers. It presents the probabilistic number and duration of interruption such as failure rate, SAIDI, SAIFI, and CAIDI. However, it has a fatal weakness at reliability index because of accuracy of failure rate. In this paper, the time-varying failure rate (TFR) of power distribution system equipment is extracted from the recorded failure data of Korea Electric power Corporation (KEPCO) in Korea. For TFR extraction, it is used that the fault data accumulated by KEPCO during 10 years. The TFR is approximated to bathtub curve using the exponential (random failure) and Weibull (aging failure) distribution function. In addition, Kaplan-Meier estimation is applied to TFR extraction because of incomplete failure data of KEPCO. Finally, probability plot and regression analysis is applied. It is presented that the extracted TFR is more effective and useful than mean failure rate (MFR) through the comparison between TFR and MFR

关键词： power system reliability Data mining Weibull distribution power distribution Failure analysis power systems Time varying systems Moon Switches Hazards

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Fast Prediction of Loadability Margins by Constructing a Small-Signal Stability Boundary Based on Neural Networks

Fast Prediction of Loadability Margins by Constructing a Sma...

引用

International Conference on power system Technology (powerCON)

作者： Xueping Gu Claudio A. Canizares Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

Determining loadability margins to various security limits is of great importance for the secure operation of a power system. A novel approach is proposed in this paper for fast prediction of loadability margins with respect to small-signal stability based on neural networks. Small-signal stability boundaries are constructed by means of loading the power system until the stability limits are reached from a base operating point along various loading directions. Back-propagation neural networks (BPNN) for different contingencies are trained to approximate these stability boundaries. A search algorithm is then proposed to predict the loadability margins from any stable operating point along arbitrary loading directions through an iterative technique based on the trained BPNNs. The simulation results for the IEEE two-area benchmark system demonstrate the effectiveness of the proposed method for on-line prediction of loadability margins.

关键词： Neural networks power system stability power system security Voltage power system simulation Monitoring National security Control systems Operating systems Bifurcation

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