Home Page | Members Only | Publications | Search | Uploads | Show Control Panel   Refresh   Help

No FOLDERS found.   Sort by:   Number   Name Author Date Size Type 01-01 Computer Simulation of Cascading Disturbances in Electric Power Systems The restructuring of electricity industry has renewed concerns about wide-area disturbances due to their increasing economic and social costs. Hidden failures in power protection systems play significant roles in propagating these disturbances. Through computer simulations, we analyze the impact of consecutive relaying malfunctions and define the protection system vulnerability and reliability to numerically characterize this impact. A heuristic random search algorithm is developed for fast rare- event simulation of cascading outages. An optimal system upgrading strategy is proposed for the economical enhancement of protection system reliability under limited budget. We examine these techniques in a case study of New York Power Pool (NYPP) 3000-bus system. This is the final report for the PSERC project. Hongye Wang and James S. Thorp 6/25/2001 279.5k PDF 01-02 CPFLOW for Power Tracer and Voltage Monitoring This report describes CPFLOW (Continuation Power Flow), a comprehensive software tool for tracing power system steady-state behaviors due to large or small variations in loads, generation, transactions, interchanges, and imports and exports. CPFLOW is designed for the analysis of large-scale power systems and can trace a solution curve through the ‘nose’ point without the numerical difficulties of repeated power flow solvers. CPFLOW can be used in a variety of applications for power system analyses (such as monitoring voltage behaviors, calculating transfer capabilities, etc.) and for analysis of transactions and transmission services. This is the final report for the Voltage Collapse Monitor project. Hsiao-Dong Chiang and Hua Li 4/3/2003 273.0k PDF 01-04 Is Strong Modal Resonance a Precursor to Power System Oscillations? We suggest a new mechanism for interarea electric power system oscillations in which two oscillatory modes interact near a strong resonance to cause one of the modes to subsequently become unstable. The possibility of this mechanism for oscillations is shown by theory and computational examples. Theory suggests that passing near strong resonance can be expected in general power system models. The mechanism for oscillations is illustrated in 3 and 9 bus examples with detailed generator models. This paper appears in IEEE Transactions on Circuits and Systems, Part I, March 2001 and was supported by the PSerc oscillations project and NSF. I. Dobson, J. Zhang, S. Greene, H. Engdahl, P.W. Sauer 4/26/2001 174.8k PDF 01-05 Automated Operating Procedures for Transfer Limits A Modern Energy Management System (EMS) provides sophisticated online security analysis applications to assist operators in ensuring that the power system can survive credible contingencies. Still in current practice, system operators generally refer to written operating procedures to establish system constraints, particularly in regards to transfer limits across major interties. The limits are based on numerous power system studies that represent the stressed system and satisfy specific performance criteria following select contingencies. The relations between these critical paths and operating conditions are tabulated and often plotted as nomograms. With such a simplified view of system conditions, the operator is unable to have a complete understanding of operational limits. Thus, transfer ratings are typically conservative, as studies are based on highly stressed system conditions, and incomplete, as studies cannot analyze all combinations of equipment out-of-service. This study investigates some approaches to improving such operator procedures. Results demonstrate the ability of neural net estimators, trained off-line, to estimate margins in real-time. This is the project's final report. Liqiang Chen, Kevin Tomsovic and Anjan Bose 6/25/2001 636.2k PDF 01-06 Adaptive Power Flow Method for Distribution Systems with Dispersed Generation This paper presents an adaptive distributed power flow solution method based on the compensation-based approach. The numerical properties of the compensation-based power flow method are compared and analyzed under different situations, such as load unbalance, sudden increase of one-phase loads, degree of meshed loops, number of generator nodes and so on. Based on these analyses, an adaptive compensation-based power flow method is proposed that is fast and reliable while maintaining necessary accuracy. It is illustrated that this adaptive method is especially appropriate for simulation of slow dynamics in the distribution system. Yaming Zhu and Kevin Tomsovic 10/25/2001 223.1k PDF 01-07 Communication Models for Third Party Load Frequency Control With deregulation of the power generation sector, the necessity for an enhanced and open communication infrastructure to support an increasing variety of ancillary services is apparent. A duplex and distributed communication system seems to be the most suitable solution to meet and ensure good quality of these services. Parameters needed and additional limits introduced by this new communication topology must be investigated and defined. This paper focuses on the communication network requirements for a third party load frequency control service. Data communication models are proposed based on queuing theory. Simulation is performed to model the effects of certain types of signal delays on this ancillary service. Sudipto Bhowmik, Kevin Tomsovic and Anjan Bose 10/25/2001 194.6k PDF 01-08 Dynamic Voltage Stability Reserve Studies For Deregulated Environment Garng Huang, H. Zhang 4/26/2001 203.1k PDF 01-09 Measurement Based Voltage Stability Monitoring of Power System Garng Huang, Liang Zhao 4/26/2001 56.1k PDF 01-10 TCSC as a Transient Voltage Stabilizing Controller Garng Huang, Tong Zhu 4/26/2001 159.4k PDF 01-11 Transaction Based Power Flow Analysis For Transmission Utilization Allocation Garng Huang, H. Zhang 4/26/2001 69.9k PDF 01-12 Rational Buyer Meets Rational Seller: Reserves Market Equilibria under Alternative Auction Designs We examine efficiency properties and incentive compatibility of alternative auction formats that an electricity network system operator may use for the procurement of ancillary services required for real-time operations. Rajnish Kamat and Shmuel S. Oren 4/27/2001 711.5k PDF 01-13 Exotic Options for Interruptible Electricity Supply Contracts This paper presents the design and pricing of financial contracts for the supply and procurement of interruptible electricity service. In particular, we propose a new contract form that bundles simple forwards with exotic call options that have two exercise points with different strike prices. Such options allow hedging and valuation of supply curtailment risk, while explicitly accounting for the notification lead time before curtailment. Rajnish Kamat and Shmuel S. Oren 4/27/2001 607.9k PDF 01-14 Prospects for Dynamic Transmission Circuit Ratings In this paper, the basic concepts of dynamic thermal ratings of overhead transmission conductors are discussed. The sensitivity of these ratings with ambient conditions is evaluated. Innovative concepts in the measurement of overhead sag are given and correlated with dynamic rating of overhead transmission conductors. K. E. Holbert and G. T. Heydt 5/1/2001 112.4k PDF 01-15 Storing Arb: Methods for Storage Valuation We present methods for valuation of virtual and physical storage contracts. Hyungsok Ahn, Albina Danilova and Glen Swindle 5/7/2001 66.0k PDF 01-16 Electric Transmission Line Flashover Prediction System Near industrial, agricultural, or coastal areas, contamination is a frequent cause of insulator flashover, most cases of which result in lengthy service interruptions. Laboratory studies and industrial experience have shown that both contamination and wetting of insulator surfaces, which initiate the flow of leakage current, are required for insulator flashover. The leakage current leading to flashover has distinctive stages of development. Flashover is preceded by dry-band arcing and extension of the arc to bridge the insulator. This combination significantly modifies both the magnitude and shape of the leakage current. A condition-based monitoring (CBM) system that monitors the easily measurable insulator leakage current as a means of assessing pollution severity and would possibly predict an approaching flashover. The overall aim of this project is the development of a system that monitors pollution build-up through the signature changes in the leakage current and alerts an operator when there is a danger of flashover. This Ph.D. thesis is the final report in the Electrical Transmission Line Insulator Flashover Predictor project with George Karady as the project leader. Felix Amarh 4/3/2003 5.4M PDF 01-17 An Engineering Approach to Monitoring Market Power in Restructured Markets for Electricity C.E. Murillo-Sanchez, S.M. Ede, T.D. Mount, R.J. Thomas, and R.D. Zimmerman 6/25/2001 243.0k PDF 01-18 Testing the Performance of Uniform Price and Discriminative Auctions T.D. Mount, W.D. Schultze, R.J. Thomas, R.D. Zimmerman 7/25/2001 2.3M PDF 01-19 Strong Resonance Effects in Normal Form Analysis and Subsynchronous Resonance Power system normal form analysis has developed coefficients and indices in modal coordinates to quantify nonlinear model interactions. The coefficients can become very large near a strong, nondiagonalizable resonance occurring in the power system linearization. Moreover, the changes in the coefficients when the power system equations are expressed in different coordinates or units show that the coefficients are not intrinsic. On a different topic, the paper suggests an explanation for the modal interaction that causes the subsynchronous resonance instability in power systems. The modal interaction is associated with a pair of strong resonances which arise as a perturbation of a weak resonance of complex eigenvalues. This idea is supported using results from the IEEE first benchmark subsynchronous resonance model and perturbation theory. The normal form work in this IREP 2001 conference paper was supported in part by NSF and the PSerc controls project. Ian Dobson 7/3/2001 316.8k PDF 01-20 Market Based Risk Mitigation This document is a white paper based on a presentation given at a special workshop on infrastructre industry at the White House conference center. The workshop was organized and co-sponsored by OSTP and NSF. The paper outlines new risk management paradigms, in the context of critical infrastructre, that are enabled by the proliferation of information technology and the emerging restructuring of infrastructure industries. Shmuel S. Oren 9/1/2001 95.5k PDF 01-21 Simulation of Top-Oil Temperature for Transformers This Masters thesis describes a software tool TOTPS (top-oil temperature prediction system) developed to predict the top-oil temperature and maximum load a transformer is capable of carrying. This is also the final report from the project "On-Line Peak Loading of Substation Distribution Transformers Through Accurate Temperature Prediction," Don Tylavsky project leader. Yong Liang 5/23/2002 788.5k PDF 01-22 Transfer Capability Calculator and Tutorial You can use this web site (1) to interactively calculate transfer capabilities on sample power systems (2) to browse tutorial and research material on transfer capability, particularly calculations involving sensitivity and uncertainty and generalizing DC load flow methods. Ian Dobson, Scott Greene, Rajesh Rajaraman, Fernando Alvarado, Chris Demarco, Ray Zimmerman, Mevludin Glavic, Antonio DeSouza, Bob Thomas et al. 1/23/2002 Link URL 01-23 Examining criticality of blackouts in power system models with cascading events As power system loading increases, larger blackouts due to cascading outages become more likely. We investigate a critical loading at which the average size of blackouts increases sharply to examine whether the probability distribution of blackout sizes shows the power tails observed in real blackout data. Three different models are used, including two simulations of cascading outages in electric power transmission systems. We also derive and use a new, analytically solvable model of probabilistic cascading failure which represents the progressive system weakening as the cascade proceeds. Ian Dobson, Jie Chen, Jim Thorp, Ben Carreras, David Newman 9/28/2001 437.7k PDF 01-24 Dynamics, criticality and self-organization in a model for blackouts in power transmission systems A model has been developed to study the global complex dynamics of a series of blackouts in power transmission systems [1, 2]. This model has included a simple level of self-organization by incorporating the growth of power demand and the engineering response to system failures. Two types of blackouts have been identified with different dynamical properties. One type of blackout involves loss of load due to lines reaching their load limits but no line outages. The second type of blackout is associated with multiple line outages. The dominance of one type of blackouts versus the other depends on operational conditions and the proximity of the system to one of its two critical points. The first critical point is characterized by operation with lines close to their line limits. The second critical point is characterized by the maximum in the fluctuations of the load demand being near the generator margin capability. The identification of this second critical point is an indication that the increase of the generator capability as a response to the increase of the load demand must be included in the dynamical model to achieve a higher degree of self-organization. When this is done, the model shows a probability distribution of blackout sizes with power tails similar to that observed in real blackout data from North America. Ben Carreras, Vickie Lynch, Ian Dobson, David Newman 9/28/2001 192.1k PDF 01-25 Power Systems Engineering Research Center This description of PSERC was prepared for the 34th Annual Frontiers of Power Conference, Oct. 29-30, 2001, at Oklahoma State University. Ward Jewell and Dennis Ray 10/17/2001 61.1k PDF 01-26 Using Weather Derivatives to Improve the Efficiency of Forward Markets for Electricity The analysis in this paper demonstrates that a combination of 1) a forward contact, with fixed price for both base land and peaking power, and 2) a collar option for the number of hot days in a summer is an effective way to reduce the risk of purchasing electricity in a spot market. The main advantages are 1) the effectiveness of price signals is strengthened by making peaking power expensive, and 2) the correlation between payouts from the weather option and high prices is increased. Tim Mount 10/24/2001 127.4k PDF 01-27 Human Factors Aspects of Power System Voltage Visualizations This paper presents experimental results associated with the human factors aspects of using color contours to visualize electric power system bus voltage magnitude information. Participants were divided into three groups: the first group only one-line numeric data, the second only one-line contour data, while the third saw both. The purpose of the experiment was to determine how quickly participants could both acknowledge low voltage violations and perform corrective control actions. Results indicated the contour only visualization resulted in the quickest voltage violation acknowledgements, while the numeric data only visualization resulted in the quickest solution times. Testing was done using a modified version of the IEEE 118 bus system. Doug Wiegmann, Aaron Rich, Tom Overbye, Yan Sun 10/25/2001 335.1k PDF 01-28 Analysis and Design of Power Acceptability Curves for Industrial Loads The main objectives of this research are the analysis, extension, understanding and modification of the power acceptability curves (e.g., the Computer Business Equipment and Manufacturers Association or CBEMA curve and Information Technology Industry Council or the ITIC curve) to permit accurate application in the case of three phase loads. This masters thesis also serves as a final report for the project "Redesign and New Interpretation of Power Acceptability Curves for Three Phase Loads" with Jerry Heydt, Project Leader. John Kyei 1/7/2002 496.5k PDF 01-29 A Spectral Bisection Partitioning Method for Electric Power Network Applications As an alternative to long-standing singular perturbation based coherency techniques, a spectral method for identifying groups of strongly connected sub-networks in a large-scale interconnected power system grid is presented. The method exploits concepts of the recursive spectral bisection (RSB) technique from the graph theory. Distinct from earlier works that have focused on partitioning dynamic models, here we will explore partitioning applications in the optimal power flow. This masters thesis is a work product of the New System Control Methodologies project. Supun Tiptipakorn 11/7/2001 564.5k PDF 01-30 Mobile Agent Software Applied in Maintenance Scheduling The deregulation in power systems brings some new issues in equipment maintenance scheduling where more coordination and communication among different entities is required. In this paper, the mobile agent software is applied in the facility maintenance scheduling in deregulated power systems environment. In the given example, the problem is de-coupled into a master problem and a sub-problem using Benders decomposition. The two problems are solved at the GENCO and the ISO respectively, and the mobile agent takes care of the communication and coordination between these two problem-solving processes. The related PSERC project is "Power System monitoring Using Wireless Substation and System-wide Communications". M. Kezunovic, X. Xu 11/19/2001 84.2k PDF 01-31 An OPF based Algorithm to Evaluate Load Curtailment Incorporating Voltage Stability Margin Criterion Paper published in NAPS 2001, College Station, TX. The related PSERC project is "Steady State Voltage Security Margin Assessment." Garng. M. Huang, Nirmal-Kumar C Nair 11/12/2001 440.5k DOC 01-32 Measurement Design and State Estimation for Distributed Multi-Utility Operation Published in NAPS 2001, College Station, TX The related PSERC project is "Power System State/Parameter Estimation and Measurement Design for Distributed Multi-Utility Operation." Garng. M. Huang, Jiansheng Lei 11/12/2001 344k DOC 01-33 On Completion Times of Networks of Concurrent and Sequential Tasks The problem of determining the time to complete multiple tasks that may proceed concurrently, sequentially, or both is considered. The solution offered avoids assuming that individual task completion times are independent or have any other dependency relationship. One application of the results is in project management, as in the context of PERT (Program Evaluation and Review Technique) diagrams. Daniel Berleant, Lizhi Xie, Jianzhone Zhang and Gerry Sheble 11/13/2001 296.5k PDF 01-34 Electric Power Transfer Capability: Concepts, Applications, Sensitivity, Uncertainty This report explains tutorial and research material on transfer capability, particularly calculations involving sensitivity and uncertainty and generalizing DC load flow methods. You can now use the web site associated with the document at http://www.pserc.cornell.edu/tcc/ to interactively calculate transfer capabilities on sample power systems. This report was produced by collaboration between PSerc and Laurits R. Christensen Associates as part of a project funded by the NSF Research Centers - Small Firms Collaborative R&D Initiative. Ian Dobson, Scott Greene, Rajesh Rajaraman, Chris DeMarco, Fernando Alvarado, Mevludin Glavic, Jianfeng Zhang, Ray Zimmerman 1/23/2002 1.4M PDF 01-35 Effects of Non-transposed Lines and Unbalanced Loads on State Estimation This paper investigates the errors introduced in the positive sequence state estimation due to the usual assumptions of having fully balanced bus loads/generations and continuously transposed transmission lines. A three-phase state estimator is first developed in order to verify the actual error free solution in the phase coordinates. Then, several tests are conducted using different assumptions regarding the availability of single and multi-phase measurements. It is demonstrated that incomplete metering of three-phase system quantities may lead to significant errors in the positive sequence state estimates for certain cases. Such cases may also lead to incorrect bad data detection and elimination, further deteriorating the quality of the state estimate. IEEE 30 bus test system is used to illustrate these cases. The related PSERC project is "Enhanced State Estimation by Advanced Substation Monitoring". Shan Zhong, Ali Abur 11/19/2001 185.2k PDF 01-36 Electricity Supply Organization: Which End Is Up? Instead of creating a top-down hierarchy for overseeing bulk power markets, the creation of four RTOs may end up inadvertently creating a smaller, decentralized generation structure. Will the new form fit its intended function, and how will it react to technological evolution within the industry? Richard E. Schuler 2/5/2002 88.0k PDF 01-37 Mobile Agent Software Applied in Maintenance Scheduling Abstract: The deregulation in power systems brings some new issues in equipment maintenance scheduling where more coordination and communication among different entities is required. In this paper, the mobile agent software is applied in the facility maintenance scheduling in deregulated power systems environment. In the given example, the problem is de-coupled into a master problem and a sub-problem using Benders decomposition. The two problems are solved at the GENCO and the ISO respectively, and the mobile agent takes care of the communication and coordination between these two problem-solving processes. X. Xu and M. Kezunovic 4/22/2002 84.2k PDF 01-38 Improving Circuit Breaker Maintenance Management Tasks by Applying Mobile Agent Software Technology Abstract--Circuit breakers are crucial components for power system operation. The currently adapted time-directed maintenance strategy and the emerging new condition-based strategy require a flexible information processing technique and software architecture. In this paper, mobile agent software has been applied in implementing circuit breaker maintenance and repair tasks. Several potential application scenarios have been described and the relevant software features have been discussed. The benefits of using the mobile agent techniques are discussed at the end. M. Kezunovic, X. Xu and D. Wong 4/22/2002 119.1k PDF 01-39 Integrating Distributed Generation Technology into Demand Management Schemes Recent developments in distributed generation technology brings extra flexibility into existing demand management schemes. Many utilities have implemented various demand management programs to help them in problematic times of the power system. This paper explains how existing demand management ideas can be supplemented by the use of distributed generation technology. More specifically it compares the economic aspects of using demand management contracts with the use of distributed generation. In some cases it is more beneficial to use distributed generation with demand management contracts. M.Fahrioglu, T.Yong, R.Lasseter & F.Alvarado 11/27/2002 222.8k PDF 01-40 Bluenet – a New Scatternet Formation Scheme Bluetooth is a new promising local area wireless technology designed to enable voice and data communication among various electronic devices. We believe that Bluetooth networks will provide reliable, flexible and cost-efficient telecommunication support for the post-deregulation electric power systems. Though not specified in version 1.0 of the Bluetooth specification, communication by way of multi-hop routing (so characteristic of ad hoc networks) within a scatternet will offer a new and exciting extension to this technology. And the topology of such an ad-hoc scatternet would have a significant effect on the overall performance of the network. In this paper we present “Bluenet” as a novel and practical scheme for building an efficient scatternet and discuss the basic rules followed by the Bluenet scheme. Two methods are introduced to evaluate the performance of the resulting scatternets base on average shortest-path length and maximum traffic-flows respectively. Finally the effectiveness of the Bluenet scheme is demonstrated through simulations and comparison. Zhifang Wang, Robert J. Thomas, Zygmunt Haas 3/11/2003 327.0k PDF 01-41 Multi-settlement Systems for Electricity Markets: Zonal Aggregation under Network Uncertainty and Market Power We analyze alternative market designs for a multisettlement system for electricity in which the resolution of the transmission network model is increased as time approaches real-time, and uncertainty about congestion patterns is resolved. Variations of such systems are implemented or have been proposed in California and other parts of the U.S. We aim to compare welfare implications of such market designs against more centralized single-settlement systems, such as those implemented in the Northeastern control areas of the U.S. We model the multi-settlement system as a two-period game and compute subgame perfect Cournot-Nash equilibria for the various market designs. Rajnish Kamat and Shmuel S. Oren 3/11/2003 209.6k PDF 01-42 Post-Contingency Equilibrium Analysis of Power Systems This paper presents alternative methods to compute the equilibrium condition immediately following a disturbance to an electric power system. The first uses the brute force method of simply integrating the dynamic model until it reaches steady state. The second uses the straightforward analytical choice of setting all time derivatives of the dynamic model to zero and solving the remaining algebraic equations for the equilibrium values of the dynamic states. This method requires the creation of new commercial software to solve the large-scale network algebraic equations simultaneously with the dynamic equilibrium equations. The third uses a method that takes advantage of existing commercial load flow software to perform the major portion of the solution process. These load flow solutions then iterate with the de-coupled algebraic equations for each generator. Peter W. Sauer 3/11/2003 216.1k PDF 01-43 Spectral Analysis of Energy-Constrained Reserves The definition of a service is key to the ability to meter it, measure it, regulate it, price it, or otherwise take it into consideration. Reserves (a form of power supply insurance) are key to power system operability. Traditionally, reserves have been characterized in terms of time domain quantities such as ramping rate capabilities and the like. Also, traditionally such measures have not considered the possibility that some of the reserve services may be energy or otherwise time-limited. This paper illustrates how to take into consideration energy constrained reserve services, and also how to classify and measure both the need for reserves as well as the ability to provide them in terms of frequency domain techniques. In a sense, the use of frequency domain quantities is more “natural” for this problem where the characterization of the speed of response is in fact quite important. The paper illustrates a number of numerical examples. Fernando L. Alvarado 3/12/2003 190.5k PDF 01-44 Testing The Effects Of Price Responsive Demand On Uniform Price And Soft-Cap Electricity Auctions Testing auction mechanisms experimentally in a controlled environment provides an inexpensive means for evaluating their relative merits. This paper describes a framework for testing the efficacy of a price-responsive load on a uniform price last accepted offer and a soft-cap market. Experimental evidence to date based on uniform price market testing has shown an ability of price responsive load to mitigate high volatility and average price. The paper addresses a process to validate these results as well as our hypothesis that price responsive load will mitigate high soft cap market price behavior such as that observed in California. R. J. Thomas, T. D. Mount, R. Zimmerman, W. D. Schulze, R. E. Schuler, L. D. Chapman 3/11/2003 351.0k PDF 01-45 Visualization and Animation of Inverter-Driven Induction Motor Operation This paper discusses a new model of an inverterdriven induction motor that enables direct animation and visualization of the inverter and motor operation. The models of the inverter and induction motor are physically based model in actual quantities. As such they enable direct animation and visualization of the operation of the inverterdriven induction motor. The paper discusses the models and the animation and visualization approach. Specifically, the animation and visualization screens are discussed in terms of the displayed information. The implementation is in Open GL that permits rendering as well as rotation, panning, and zooming in real time. The paper presentation is by means of a live presentation of the animation and visualization models. A. P. Sakis Meliopoulos, W. Gao, George J. Cokkinides 3/11/2003 400.6k PDF 01-46 Real Time Digital Processing of GPS Measurements for Transmission Engineering The focus of this paper is on the digital signal processing (DSP) of differential GPS (DGPS) measurements. The paper describes a methodology for further improving DGPS altitude measurements for the purpose of accurate determination of high voltage overhead conductor sag. The wavelet transforms and least squares parameter estimation (LSPE) techniques are considered Last Edited: 10/25/01 C. Mensah-Bonsu and G. T. Heydt 4/5/2003 238.1k PDF 01-47 A Phase-Transition Model for Cascading Network Failure As the scale of engineered systems such as electric power grids, communication networks, and the internet expands, and as society's dependence upon reliable operation of these networks increases, it is vital that system engineers seek a better understanding of how small scale failures of individual elements may propagate to produce global, system-wide failures. In a deterministic model, we seek to capture the role of transient dynamic response following a specified initiating disturbance and examine subsequent (“cascading”) element failures that are induced when operating thresholds for individual elements are exceeded along the state trajectory. Chris DeMarco 8/27/2003 8.5M PDF 01-48 The FGR vs. FTR debate: Facts and Misconceptions Comments in 2001 on FERC Docket No. RM01-12-000 (Electricity Market Design and Structure). Uploaded: Sep. 20, 2005. Shmuel S. Oren 9/20/2005 220.3k PDF 01-49 State Estimation for the Detection of Market Parameters Deregulation of electric utilities has led to a new competitive regime for utilities. In traditional systems, the main objective is to estimate voltages and flows. Estimators that include the ability to determine system parameters along with system (conditions have been developed. In the evolving deregulated environment there are a host of new estimation needs. The various costs of the participants, estimation of the degree of market power, estimation of the price elasticities of the participants, and estimation of the volatilities of prices. This paper addresses two estimation needs. It defines the problem of estimation system status based on the knowledge of published PTDFs (Power Transfer Distribution Factors) by describing a new procedure for estimating parameters It also reformulates a previously presented but not much publicized method for estimating the cost elasticities of generators. IEEE/PES Summer Meeting, Vancouver, BC. July 16, 2001. Uploaded: Sep. 26, 2005. Fernando Alvarado 9/26/2005 1.1M PDF 01-50 Kirchhoff vs. Competitive Electricity Markets: A Few Examples Electric power is often regarded as a homogeneous commodity due to the ubiquity of the transmission grid. This paper, however, presents a collection of cases in which the physical laws governing network flows can have anomalous and unexpected market implications. For example, reactive power requirements can affect optimal unit commitment and impact real power prices in otherwise competitive markets. Network topology and constraint interactions can result in other unwelcome market phenomena, such as large price differentials within a congestion zone, nodal prices well above the highest offer and “cascading market power”. IEEE Power Engineering Society Winer Meeting 2001. Vol. 3, pp. 1256-1261. Uploaded: June 27, 2006. C. Murillo-Sanchez, R. Zimmerman, R. Thomas 6/27/2006 871.1k PDF 01-51 Aligning Public Policy with Electricity Markets While nearly everyone points to deregulation, spiking electricity prices, rolling blackouts, potential utility bankruptcies and generator greed, the fundamental problem with electricity supply is being unable to decide how to decide about siting new generation and transmission facilities, Because of enormous public impacts, these are properly public decisions. And so it is government that should live up to its responsibilities in facilitating decisions on proposed new facilities. But even expeditious action today will not bring additional capacity on line for at least two, more likely four, years. Beyond that, we need to check on the adequacy of gas pipeline capacity, turbine-generator manufacturing capability and gas exploration rates. IEEE Power Engineering Society Summer Meeting 2001. Vol. 1, pp. 555-557. Uploaded: June 27, 2006. R. Schuler 6/27/2006 390.7k PDF 01-52 Visualization and Animation of Protective Relay Operation from DFR Datat DRF data are useful for post mortem analysis of system disturbances. Central to this problem is the response of relays to disturbances. This paper presents an improved method for post-mortem analysis of relay response to disturbances from DFR data. Specifically, a visualization application for the operation of protective relays using digital fault recorder data is presented. The visualization is implemented with animated display objects attached on a general purpose DFR data display and analysis package (XFM). The visualization objects illustrate the evolution of relay variables that are used to determine the tripping logic. Two examples of protective relay types are presented: (a) a modified mho relay and (b) a transformer differential relay. This tool is extremely valuable for educational purposes. Another potential application is digital relay testing. Actual digital relay algorithms can be interfaced to the visualization objects, yielding a flexible testing tool for the plethora of relays and relay manufacturers. Proceedings of the 2001 Georgia Tech Fault & Disturbance Analysis Conference, Atlanta, GA. Uploaded June 30, 2006. A.P. Sakis Meliopoulos and George J. Cokkinides 6/30/2006 551.4k PDF

Show Control Panel   Refresh   Help

Last Modified: 16:42:25 6/30/2006