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No FOLDERS found.   Sort by:   Number   Name Author Date Size Type 08-01 Agent-Based Test Beds for Power Industry Research, Teaching and Training PSERC Tele-Seminar slides, February 5, 2008. Wholesale power markets are complex systems encompassing structural constraints, institutional arrangements, and the behavioral dispositions of human participants. To be compelling and useful, studies of such systems must take all three elements into proper account. This talk will discuss the potential usefulness of agent-based test beds as research, teaching, and training tools for the exploratory study of wholesale power markets. Leigh Tesfatsion 2/2/2009 781.0k PDF 08-02 An Online Dynamic Security Assessment Scheme Using Phasor Measurements and Decision Trees (Project S-27) PSERC Tele-Seminar Slides, February 19, 2008 This talk describes an online dynamic security assessment scheme for large-scale interconnected power systems using phasor measurements and decision trees which was developed as a part of the PSERC project S-27. The scheme builds and periodically updates decision trees offline to decide critical attributes as security indicators. Decision trees provide online security assessment and preventive control guidelines based on real-time measurements of the indicators from phasor measurement units. The scheme uses a new classification method involving each whole path of a decision tree instead of only classification results at terminal nodes to provide more reliable security assessment results for changes in system conditions. The approaches developed are tested on a 2100-bus, 2600-line, 240-generator operational model of the Entergy system. The test results demonstrate that the proposed scheme is able to identify key security indicators and give reliable and accurate online dynamic security predictions. Vijay Vittal 5/9/2008 820.6k PDF 08-03 The Efficiency of Uniform-Price Electricity Auctions: Evidence from Bidding Behavior in ERCOT PSERC Tele-Seminar slides, March 4, 2008 Recent empirical analyses by both economists and engineers suggest that power market auction mechanisms may not yield efficient outcomes. Recent work has uncovered evidence that actual bidding by some market players leads to prices that distort the proper price signal. Generators that bid significantly above the incremental marginal cost of generation can inflate prices and send distorted signals as to the proper amount and location of new investment. Similarly, in balancing markets, firms that bid below the marginal cost of “DECing” in gaming a market suppress energy prices and possibly discourage investment. Evidence of both types of behavior has been found in several markets. This tele-seminar will discuss evidence that bidders distort the efficient price signal. Steve Puller 3/31/2008 322.0k PDF 08-04 Satellite Imagery for the Identification of Interference with Overhead Power Lines (Project T-37) PSERC Tele-Seminar slides, March 18, 2008 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 would 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. In this project, two tools were implemented and tested: 1) a transmission line scanning computer program and 2) a tall tree identification program. This work is significant because it shows how satellite images that are already commercially available can be used for the large-scale assessment of vegetation encroachment on transmission lines. George Karady 12/18/2008 996.5k PDF 08-05 Designing CO2 Trading Markets for the Power Sector: Does It Matter Who Gets the Allowances and Who Must Comply? PSERC Tele-Seminar slides, April 1, 2008. Carbon allowance trading has been implemented in the European Union, and will start in several eastern states in June. Meanwhile, several western states and Canadian provinces are negotiating the formation of a trading region for the West, and it appears likely that a federal system will emerge in the next Congress, if not before. Because of the potentially large costs that would result, as well as the large economic rents, from implementation of these systems, there has been intense political discussion of who should be responsible for compliance and how allowances should be distributed. In this seminar, I’ll discuss whether the answers to these questions are important from the point of view of overall economic efficiency. Benjamin F. Hobbs 4/2/2008 455.0k PDF 08-06 Operational Defense of Power System Cascading Outages (Project S-26, Part 1) PSERC Tele-Seminar slides, April 15, 2008 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 consequence events. Power operators can take actions if they have the right information provided by tools for monitoring and managing the risk of cascading outages. Such tools are being 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. James McCalley and Siddhartha Khaitan 12/18/2008 1.2M PDF 08-07 Demand Response via Real-Time Pricing to Increase Use of Operational Wind Energy Generators PSERC Public Tele-Seminar Slides for May 6, 2008 One of the impediments to large-scale deployment of wind generation within power systems is its non-dispatchability, and variable and uncertain real-time energy output. Operating constraints on conventional generators (such as minimum generation points, forbidden zones, and ramping limits) as well as system constraints (such as power flow limits and ancillary service requirements) may force a system operator to curtail wind generation to ensure that the system can be operated securely. Furthermore, the pattern of wind availability and electricity demand may not allow wind generation to be fully utilized in all hours. Constraining output from operational wind energy generators raises costs and air emissions, and makes it more difficult to reach targets set by renewable portfolio standards. In this seminar, I will discuss the use of real-time pricing (RTP)as a demand-response solution that could help operators make better use of wind resources. RTP can (1) help to smooth-out the diurnal load pattern to reduce the effects of binding unit operating constraints on wind utilization, (2) provide the incentive for demand to increase in response to the availability of wind generation with its zero variable energy cost, and (3) reduce transmission congestion by using locational prices to increase demand on the ‘export side’ of a transmission constraint. I will discuss a case study based on the ERCOT power system with different estimates of demand responsiveness to demonstrate the potential increase in the use of wind generation as a result of implementing RTP. Ramteen Sioshansi 5/9/2008 252.5k PDF 08-08 Effective Power System Control Center Visualization (PSERC Project S-25) PSERC Tele-Seminar slides, June 3, 2008 This tele-seminar presents results from PSERC project S-25, “Effective Power System Control Center Visualization. The key purpose of this project was to do perform research aimed at increasing the effectiveness of power system visualizations, with a particular emphasis on those used in the control center environment. The specific research accomplishments from this project can be grouped into six areas. First, the project developed 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. Second, two approaches to reduce the time needed to produce power system contours were developed. Third, a technique was developed for using phasor measurement unit (PMU) data to determine status changes of devices such as transmission lines and generators. Fourth, the project explored the direct visualization of the voltage angle information being provided by PMUs. Fifth, this report provides insight and analysis with regard to the human factors aspects of power system visualization. Finally, the projected investigated the use and visualization of GPS synchronized data for power system stability assessment. Each of these accomplishments is briefly described below. Tom Overbye 12/18/2008 2.4M PDF 08-09 PMU-Enabled Distributed State Estimation with the SuperCalibrator PSERC Public Tele-Seminar Slides for June 17, 2008 PSERC researchers at Georgia Tech have been searching for improved state estimation and power grid visibility approaches that use advanced data acquisition hardware. This research has led to the creation of the “SuperCalibrator,” a new technology that enables distributed state estimation by using existing relay/PMU devices in substations. Recently, these researchers teamed up with Concurrent Technologies Corporation (CTC) through the U.S. Department of Energy’s Center for Grid Modernization to accelerate development of fully distributed state estimator technologies and their use in modern energy management systems. The concept was proved on two two-substation systems of the NYPA and ENTERGY systems in a 2006-07 project. This effort has been focused on implementing and demonstrating this technology in a full system (the U.S. Virgin Island WAPA system). This work is being performed by Professors A. P. Meliopoulos and George Cokkinides. The fully distributed three-phase state estimator will be described in this tele-seminar. Sakis Meliopoulos 9/2/2008 2.9M PDF 08-10 The Effects of Greenhouse Gas Limits on Electric Power System Dispatch and Operations PSERC Public Tele-Seminar Slides for Sep. 2, 2008 The electric power industry is and will continue to be a primary focus of existing and future greenhouse gas (GHG) emission regulations. Different from other air pollutant regulations such as for SO2 and NOx, GHG regulations have the potential to significantly affect electric power system dispatch and operations over a relatively short period, so the implications are significant enough to warrant an in-depth study. This presentation first discusses several power system features that will impact CO2 emissions. Then the formulation of a CO2 emission-constrained AC optimal power flow (OPF) is presented. The effects of the proposed approach on power system dispatch and operations were investigated using the standard IEEE 24-bus reliability test system through several case studies. For each case study, a wide range of CO2 prices were modeled. Miaolei Shao 9/2/2008 2.2M PPT 08-11 Incenting Transmission Reliability and Adequacy Related Investments (PSERC Project M-11) PSERC Tele-Seminar slides, September 16, 2008 This tele-seminar presents results from PSERC project M-11, “Incenting Transmission Reliability and Adequacy Related Investments.” Adequate transmission capacity enhances reliability, lowers energy cost as delivered, limits market power of market participants, and provides flexibility to protect against market uncertainties such as load fluctuation, fuel price volatility, and unexpected facility outages. Incentives for attracting investments in transmission assets are essential to the overall success of the restructuring of the electric power industry. We will present research outcomes related to the evaluation of market-based schemes for compensating transmission investments from the following perspectives: i) Power system simulation approach for evaluating transmission reliability and adequacy related investments, ii) Econometric modeling of the price of financial transmission rights, iii) Forward price risk premium and implications for transmission investments, iv) Nonparametric modeling of the Hub-and-Spoke Representation of a Network, v) Inherent inefficiency of FTR auctions. Shijie Deng 12/18/2008 1.4M PDF 08-12 The Key Role of Network Systems Engineering in Meeting the Energy and Environment Dream Slides for the PSERC Public Tele-Seminar on Oct. 7, 2008. This talk concerns the basic challenge of transforming today’s passive electric power grids into active enablers of efficient and reliable utilization of emerging unconventional energy resources. We pose the problem of future electric energy systems as the problem of network design, monitoring, and control for enabling implementation of multiple objectives by the actors embedded at various network layers. Typical tradeoffs of interest are efficiency, cost, emissions, network congestion, profits, differentiated reliability, long-term sustainable services, etc. We present our new cyber-physical modeling framework as a possible way to represent future electric energy systems. The emphasis is on model structure needed for effective deployment of distributed sensing and decision tools. Finally, we describe the fundamental role of fast-switched electric network control for shaping effective system energy dynamics. We argue that while on the average no real work is done, very fast distributed switching of stored energy in wires (inductors and capacitors) enables stable delivery of energy which would otherwise be impossible. Such active wire control may become key to balancing highly stochastic supply according to desired quality of service. Marija Ilic, Speaker 11/3/2008 1.6M PDF 08-13 Oscillation Monitoring System (Project S-29) PSERC Tele-Seminar slides, October 28, 2008 This tele-seminar is based on Part II of PSERC Project S-29. Poorly damped oscillations in a power system can lead to permanent damage of expensive power system equipment if persistent over an extended period of time (e.g., 30 minutes), and they also pose power quality issues. Negatively-damped oscillations can be even more problematic by resulting in sudden tripping of generators and/or widespread system blackout such as occurred in the August 10, 1996 western power system blackout. In the recently concluded PSERC research project, we designed, developed and implemented an Oscillation Monitoring System (OMS) that uses wide-area PMU measurements for automatically monitoring for poorly damped and/or negatively-damped oscillatory modes. OMS includes two complementary engines that provide real-time modal analysis: 1) an automatic Prony-type analysis of power system responses following routine events such as line tripping and generator outages; and 2) an engine for continuous estimation of poorly damped mode frequencies and their damping ratios from routine ambient noise PMU measurements. Mani V. Venkatasubramanian 12/18/2008 357.0k PDF 08-14 A SuperOPF Framework for Improved Allocation and Valuation of System Resources through Co-optimization Slides for PSERC public tele-seminar on Nov. 4, 2008. There are wide range of activities in the power systems area that depend critically on the availability of tools which enable decision-makers to properly allocate and value system resources, including shared public goods such as reliability. Current state-of-the-art tools typically break the relevant optimization problems down into sequences of sub-problems, often using DC approximations to model the transmission network and replacing voltage and adequacy requirements with corresponding proxy constraints. The SuperOPF provides a framework for proper allocation and valuation of resources through true co-optimization. Instead of solving a sequence of simpler and approximate sub-problems, the SuperOPF approach combines everything into a single mathematical programming framework, with a full AC network and simultaneous co-optimization across multiple scenarios. Ray Zimmerman, Cornell Univ. 11/4/2008 3.0M PDF 08-15 Integration of Operational and Non-Operational Data for Improved EMS Monitoring (Project T-32) PSERC Tele-Seminar slides, November 18, 2008 This tele-seminar is based on Part I of PSERC Project T-32 (forthcoming) as well as the findings reported in PSERC Report 08-07 titled “Optimized Fault Location” published in April 2008. Nowadays, most of the substations are equipped with Intelligent Electronic Devices (IEDs) which can collect huge amounts of data in addition to performing their intended functions. The IEDs include digital protective relays (DPRs), digital fault recorders (DFRs), phasor measurement units (PMUs), circuit breaker monitors (CBMs), power quality monitors (PQMs), remote terminal units (RTUs), etc. Traditionally, RTUs constitute data acquisition part of a supervisory control and data acquisition (SCADA) system, which is the main infrastructure for monitoring and operating power system. The data continuously collected by SCADA is called “operational” data. Other types of IEDs, such as DPRs and DFRs are collecting data only when a disturbance occurs, and this data is called “non-operational” data. PMUs are unique devices in that they collect data continuously, but have not yet been fully integrated with SCADA data. Hence, this new data is typically referred to as “situational awareness” data. Mladen Kezunovic 12/18/2008 5.0M PDF 08-16 Real Time Market Power Monitoring PSERC Tele-seminar Slides: Dec. 9, 2008 Over the past few years we have developed and studied sensitivity-based methods to identify market participants with the ability to increase prices without changing dispatch (load pockets), and/or to simultaneously increase prices and revenues. Mathematically, the method involves calculating the sensitivity of an optimal power flow (OPF) to changes in offer price. In our prior work we applied this technique to a 30-bus test system with six suppliers with dispatch determined using a full nonlinear AC OPF. Market power potential determined using sensitivity calculations are consistent with market power observed in economic experiments. Recently we have focused on challenges to allow the application of our techniques to large-scale systems. In this presentation we present our theoretical analysis of the structure of sensitivity matrices and show illustrative results on the common 118 bus system. We then present results from applying our methods to a couple large-scale model, including snapshots from PJM data. Bernie Lesieutre 12/8/2008 2.5M PDF 08-17 Massively Deployed Sensors PSERC Tele-seminar Slides: Dec. 9, 2008 This tele-seminar provides a summary of a PSERC project on a range of unconventional sensor applications in electric power engineering. Included are: Integration of existing sensory information from sensors (e.g,. temperature and pressure, substation security perimeter status, substation battery voltage, neutral - ground voltage, liquid levels) into the EMS and alarm processing software tools. Investigation of unconventional sensors and sensory information (e.g., satellite graphic information, mechanical position and inclinometer-type sensors, static wire impedance, conduit and cable trough conductivity). Development of alarm processing techniques and algorithms that utilize a large number of sensory information sources including unconventional sensory information. The alarm processing techniques may use innovative mathematical techniques. The use of a very large number of signals for enhanced power system operation and operational decision making in order to capture new information and to enhance the accuracy, quality, and redundancy of the collected information. Jerry Heydt 12/11/2008 1.1M PDF

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Last Modified: 11:37:25 2/ 2/2009