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| 08-01 | A Tool for On-line Stability Determination and Control for Coordinated Operations between Regional Entities Using PMUs
This project examines the application of phasor measurement units (PMUs) for on-line transient stability assessment in an operational decision-making environment. The primary motivation for the project arises from the critical need to develop analytical tools to enhance power system reliability, from the goal to provide superior operational situation awareness using accurate real-time measurements, and from the search for innovative applications for measurements made using PMUs.
PSERC Project Report S-27. Uploaded: January 10, 2008. | Vijay Vittal, Gerald Heydt, A.P. Sakis Meliopoulos | 5/3/2008 | 1.4M | PDF |
| 08-02 | Satellite Imagery for the Identification of Interference with Overhead Power Lines
In recent years, renewed emphasis has been placed on vegetation management of transmission right-of-way to avoid tree contacts that could put system reliability at risk. At the same time, new approaches to vegetation management have been sought to be able to achieve the needed tree clearances as cost-effectively as possible. One possible approach is to process satellite images to prioritize tree maintenance work. For this approach to work, new computational tools will be needed to convert satellite image data into useful information for vegetation management scheduling. This project's objective was to develop such computational tools for determining the location of trees interfering with overhead transmission lines. The input data were derived from satellite images, and the GPS coordinates and altitudes of transmission towers. The tools determine the location of healthy trees that are penetrating a danger zone or safety envelope (e.g., 20 ft. radius) surrounding the conductors.
Final report for PSERC project T-28. Uploaded: January 15, 2008. | George Karady, Gerald Heydt, Matthias Moeller, Yoshihiro Kobayashi | 5/3/2008 | 12.4M | PDF |
| 08-03 | Digital Protection System Using Optical Instrument Transformers and Digital Relays Interconnected by an IEC 61850-9-2 Digital Process Bus
All-digital systems for measurement, protection, and control with components from different manufacturers are increasingly being deployed in electric power substations. As this occurs, a critically important task becomes the verification that required performance and expected design criteria are satisfied for any specific system configuration and interdevice communications standard. Of particular focus in this research is the development of a methodology for testing device interoperability under the International Electrotechnical Commission (IEC) Standard 61850-9-2 on communication interfaces in substations.
Final report for PSERC project T-29. Uploaded: January 29, 2008. | Mladen Kezunovic, George Karady, Levi Portillo, Zarko Djekic, Sadik Kucaksar, Yan Ma | 5/3/2008 | 2.4M | PDF |
| 08-04 | Risk of Cascading Outages
Cascading outages in power systems are costly events that power system operators and planners actively seek to avoid. Such events can quickly result in power outages for millions of customers. Although it is unreasonable to claim that blackouts can be completely prevented, we can nonetheless reduce the frequency and impact of such high conse-quence events. Power operators can take actions if they have the right information pro-vided by tools for monitoring and managing the risk of cascading outages. Such tools were developed in this research project by identifying contingencies that could initiate cascading outages and by determining operator actions to avoid the start of a cascade. Power system planners can also take actions if they have knowledge of the effects of transmission investments on the risk of cascading blackouts. In this project, system risk assessment tools were developed to estimate the overall risk of cascading transmission line overloads. The goal of this line of research on the risk of cascading outages is the creation of new tools that power system operators and planners can use to enhance system reliability.
Parts A and B of the Final Report from PSERC Project S-26. Uploaded: February 27, 2008. | Ian Dobson and Jim McCalley | 6/4/2008 | 4.1M | PDF |
| 08-05 | Transient Testing of Protective Relays: Study of Benefits and Methodology
The operational security of the power system depends upon the successful performance of the thousands of relays that protect the system from cascading failures, that protect equipment, and that help balance load with generation when system frequency is too low or too high. The failure of a relay to operate as intended may jeopardize that stability of the entire system and equipment in it. In fact, major system failures after a disturbance are more likely to be caused by unintended protective relay operation rather than by the failure of a relay to take an action at all. Appropriate relay testing provides one line of defense against relay failures. Relay testing improvements need to continue because of the new demands placed on relays from power system conditions that are more variable in the past, because of high customer expectations for power delivery reliability, and because of changing relay technologies.
Final report for PSERC project T-30. Uploaded: April 10, 2008. | Mladen Kezunovic, Sakis Meliopoulos, Ward Jewell | 6/30/2008 | 4.2M | PDF |
| 08-06 | Optimal Allocation of Static and Dynamic VAR Resources
In recent years, new attention has been given to use of volt-amperes reactive (VAR) resources to support power system operation. The engineering questions are how much VAR resources are needed, where should they be located, and what should the allocation be between static VARs that provide constant VARs and dynamic VARs that can be controlled in real-time. The project’s objectives were (1) to develop realistic models that accurately model system dynamics and capture voltage recovery phenomena, (2) to develop criteria for selection of the optimal mix and placement of static and dynamic VAR resources in large power systems based on modeling results using the tools developed part, and (3) to create a unified optimization model for minimizing the deployment of static and dynamic VAR resources while meeting the criteria. The project was accomplished in five integrated steps described in the four volumes of this report. A fifth volume is still being prepared and will be distributed separately. A test system provided by Entergy was used as a common platform to test the tools.
Final report for PSERC project S-24. Uploaded: April 1, 2008. | Sakis Meliopoulos | 6/30/2008 | 6.8M | PDF |
| 08-07 | Optimized Fault Location
Currently large amounts of data are collected by Intelligent Electronic Devices (IEDs) at the substation level. Beyond the traditional Supervisory Control and Data Acquisition (SCADA) data collected by Remote Terminal Units (RTUs), very little of other IED data is integrated into current Energy Management System (EMS) solutions. The goal of the project is to investigate the potential benefits of integrating information obtained from the substation IED data, beyond what is obtained from RTU data, into the EMS. This report describes development of the software aimed at automated fault location analysis and visualization. A complete system for automated fault location (FL) analysis including visualization of results and behavior of equipment is developed.
Concurrent Technologies Corporation Final Public project report. Uploaded: April 11, 2008. | Mladen Kezunovic | 4/15/2008 | 1.7M | PDF |
| 08-12 | Effective Power System Control Center Visualization
Visualization of power system conditions can help power system operators maintain adequate situational awareness. This project’s purpose was to perform research to increase the effectiveness of power system visualizations, with a particular emphasis on visualization used in the control center environment. Six areas where specific research accomplishments were attained in this project include: A new power system visualization approach, known as geographic data views, to provide better visualizations for use during operator initiated power system control and for engineering analysis; Two new approaches to reduce the time needed to produce power system contours; A technique for using phasor measurement unit (PMU) data to determine status changes of devices such as transmission lines and generators; Direct visualization of the voltage angle information being provided by PMUs; Insight and analysis on the human factors aspects of power system visualization; Use and visualization of GPS synchronized data for power system stability assessment.
Final Report for PSERC Project S-25. Uploaded: May 28, 2008. | Tom Overbye, et. al. | 8/22/2008 | 5.7M | PDF |
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