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| 1 | Growth Chemistry and Its Relationship to Amorphous Si Devices for Photovoltaic Energy Conversion
Presentation slides from the Jan. 15, 2002 seminar.
Solar energy conversion based on amorphous Si ( a-Si) is becoming an important part of the solar energy industry. In this talk, I will show that fundamental considerations of growth chemistry can lead to insights which can improve the properties of the material and also improve its stability.
| Vikram L. Dalal | 4/2/2002 | 84.5k | PDF |
| 2 | A Zero-Reflection Controller for Electromechanical Disturbances in Power Networks
Presentation slides from the February 5, 2002 seminar.
We present a control strategy to extinguish propagating electromechanical disturbances occurring on regular grids of power system generators. The approach used is analogous to impedance matching for transmission lines to inhibit reflections of travelling electromagnetic waves. | Bernie Lesieutre | 4/2/2002 | 260.7k | PDF |
| 3 | Power Quality Assessment via Physically Based Modeling
Presentation slides from the March 5, 2002 seminar
Physically based modeling provides an excellent approach for: (a) meaningful assessment procedures for PQ performance of the system, and (b) Cost benefit analysis by deriving the interrelationship between design parameters and PQ performance. A physically based model is presented that quantifies the impact of design options on power quality. Statistical methods represent the best way for meaningful assessment of power quality. The combination of these methods provides an excellent tool for correlating design options to power quality performance and subsequent cost-benefit analysis. Examples of this approach are presented using Monte Carlo simulation techniques. The approach is very useful for meaningful and cost effective improvements of the system to maximize power quality. | Sakis Meliopoulos | 4/2/2002 | 645.1k | PDF |
| 4 | On-Line Transient Stability and Voltage Collapse Prediction Using Multi-Agent Technique
Presentation slides from April 2, 2002 Seminar.
The seminar presents a new method to predict voltage and transient instability. The method utilizes an algorithm used to control robots. The advantage of this method is that the knowledge of the power system parameters are not required. The prediction is based on the measured data. The feasibility of the method is demonstrated using WSCC and IEEE 50 bus system. | George Karady | 4/4/2002 | 285.8k | DWG |
| 5 | Distribution Harmonic Issues: Telephone Noise
Presentation slides from the September 3, 2002 seminar.
As long as telephone and power distribution systems have coexisted power line currents have induced noise on telephone circuits. Inductive coordination on the phone system usually reduces noise to acceptable levels. Increasing harmonic loads on the distribution system, however, sometimes cause audible telephone noise that cannot be addressed through conventional means. This presentation will review how noise is induced on telephone circuits, and how the causes of induced noise can be measured, analyzed, and finally, mitigated. | Ward Jewell | 9/6/2002 | 403.2k | PDF |
| 6 | Self-Healing in Power Systems: An Approach Using Islanding and Rate of Frequency Decline Based Load Shedding
Presentation slides from the Oct. 1, 2002 seminar.
This talk describes a self-healing strategy to deal with catastrophic events when power system vulnerability analysis indicates that the system is
approaching an extreme emergency state. In our approach, the system is adaptively divided into smaller islands with consideration of quick
restoration. Then a load shedding scheme based on the rate of frequency decline is applied. The proposed scheme is tested on a 179-bus, 20-generator
sample system and shows very good performance.
| Vijay Vittal | 9/27/2002 | 460.4k | PDF |
| 7 | Advanced Monitoring System for Health Assessment of Overhead Transmission Lines
Presentation slides for the Nov. 5, 2002 seminar.
This seminar presents a real-time monitoring system based on electro-magnetic acoustic wave propagation and artificial neural network signature analysis to diagnose mechanical integrity of electric transmission lines. A sensor system composed of a receiver and a transmitter generates microdisplacement waves along the conductor, and captures reflected waves. For key information, embedded in the captured signatures, feature extraction methods and ANN-based classifiers are considered and employed. In this monitoring system, fault detection is achieved using the reflected signatures from broken strands or corroded transmission lines. Details of the system design, operating procedure, and the results of performance studies in a laboratory test bed, as well as field tests on actual lines are presented. Based on experimental results, this non-invasive, non-destructive monitoring system with neural-based classifier has demonstrated excellent performance in fault detection of high voltage live transmission lines. | Rahmat Shoureshi | 12/2/2002 | 4.1M | PDF |
| 8 | Reactive Power Considerations in Linear Load Flow with Applications to Available Transfer Capability
Presentation slides for the December 3 seminar. Linear load-flow methods have traditionally been limited to real power flow estimates using distribution factors. This seminar will focus on the use of these linear methods to estimate Available Transfer Capability (ATC), or more appropriately Total Transfer Capability (TTC). Sources of error in linear load flow methods will be examined with particular attention to the role of reactive power. A fast and simple method to reduce the error in linear methods by considering reactive power effects will be presented. The method will be illustrated on one small example and two large test examples. Possible extensions to predict linear load flow failure will be discussed. | Peter Sauer | 12/3/2002 | 933k | PPT |
