Journal ArticleDOI
Complete bounding method for AC contingency screening
V. Brandwajn,M. G. Lauby +1 more
TLDR
A new contingency analysis technique is described which overcomes the deficiencies of existing methods and has been implemented in a production-grade program designed for real-time applications.Abstract:
The analysis of the effects of hundreds of outages on line flows and bus voltages is required for the real-time security analysis and contingency enumeration. This increases the demands on the speed, accuracy and adaptability of the solution methods. Ideally, an ac power flow should be solved for each contingency, followed by a check for limit violations and major shifts from the initial system conditions. Such an approach is not feasible for practical systems consisting of hundreds of buses. To cope with this computational barrier, various approximate methods have been developed based on the idea that the vast majority of outages does not cause major shifts/violations. There are two classes of such methods, explicit and implicit techniques, which ease the computational burden by identifying cases with severe system limit violations. The explicit methods do not identify or solve for specific violations. Rather, they quantify the severity of each outage by a scalar index by which all the contingencies can be ranked. The explicit methods are not completely reliable since they are prone to masking errors. Specifically, a contingency with a few severe violations can be ranked equally with one with many minor violations or even worse, with one without violations. The implicit methods, though more demanding in CPU resources, permit the identification of actual violations/ major shifts and, therefore avoid masking errors. This paper describes a new contingency analysis technique which overcomes the deficiencies of existing methods. This technique has been implemented in a production-grade program designed for real-time applications.read more
Citations
More filters
Journal ArticleDOI
Designing the Next Generation of Real-Time Control, Communication, and Computations for Large Power Systems
TL;DR: The thesis of this paper is that the changing environment requires a new look at the operation of the power grid and a complete redesign of the control, communication and computation infrastructure.
Journal ArticleDOI
Real-time pricing of reactive power: theory and case study results
M.L. Baughman,S.N. Siddiqi +1 more
TL;DR: In this article, an analysis of real-time pricing policies of reactive power using a modification of the OPF (optimal power flow) model is presented, followed by a case study illustrating the magnitudes and ranges that realtime prices might take on under different circumstances.
Journal ArticleDOI
On-line power system security analysis
N.J. Balu,T. Bertram,Anjan Bose,V. Brandwajn,G. Cauley,David Curtice,A. A. Fouad,L. Fink,M. G. Lauby,Bruce Wollenberg,J. N. Wrubel +10 more
TL;DR: A broad overview of on-line power system security analysis is provided in this paper, with the intent of identifying areas needing additional research and development, such as external system modeling and external system analysis.
Journal ArticleDOI
Impact of Security on Power Systems Operation
TL;DR: The paper highlights issues and challenges for implementing security options in electricity markets and concludes that global analyses of security options could provide additional opportunities for seeking optimal and feasible schedules in various time scales.
Journal ArticleDOI
Identification of Umbrella Constraints in DC-Based Security-Constrained Optimal Power Flow
TL;DR: It is shown that by removing superfluous constraints, the resulting sizes of SCOPF problems are much smaller and can be solved significantly faster.
References
More filters
Journal ArticleDOI
Fast Decoupled Load Flow
TL;DR: This paper describes a simple, very reliable and extremely fast load-flow solution method that is attractive for accurate or approximate off-and on-line routine and contingency calculations for networks of any size, and can be implemented efficiently on computers with restrictive core-store capacities.
Journal ArticleDOI
Automatic Contingency Selection
G. C. Ejebe,Bruce Wollenberg +1 more
TL;DR: A fast technique has been developed for the automatic ranking and selection of contingency cases for a power system contingency analysis study and results of this technique applied to different test systems are presented.
Journal ArticleDOI
Sparse Vector Methods
TL;DR: The efficiency of the sparse vector methods is verified by tests on a 156-bus, a 1598-bus and a 2265-bus system and the new methods are significantly faster than the established sparse matrix techniques.
Journal ArticleDOI
Sparsity-Oriented Compensation Methods for Modified Network Solutions
O. Alsac,B. Stott,W. F. Tinney +2 more
TL;DR: The paper gives a unified derivation and analysis of compensation methods for the efficient solution of network problems involving matrix modifications, including the removal, addition and splitting of tiodes.
Journal ArticleDOI
An Advanced Contingency Selection Algorithm
TL;DR: In this article, the authors present an advanced contingency selection algorithm, which is essentially equivalent to a ranking based on the results of a DC load flow of each case, only at a fraction of the calculation time.