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PMU Placement for Line Outage Identification via Multiclass Logistic Regression
Taedong Kim, Stephen J. Wright
We consider the problem of identifying a single line outage in a power grid by using data from phasor measurement units (PMUs). When a line outage occurs, the voltage phasor of eac…
Sorting Network Relaxations for Vector Permutation Problems
Cong Han Lim, Stephen J. Wright
The Birkhoff polytope (the convex hull of the set of permutation matrices) is frequently invoked in formulating relaxations of optimization problems over permutations. The Birkhoff…
Validating Sample Average Approximation Solutions with Negatively Dependent Batches
Jiajie Chen, Cong Han Lim, Peter Z. G. Qian +2
Sample-average approximations (SAA) are a practical means of finding approximate solutions of stochastic programming problems involving an extremely large (or infinite) number of s…
An SLP-Active Set Approach for Feasibility Restoration in Power Systems
Taedong Kim, Stephen J. Wright
We consider power networks in which it is not possible to satisfy all loads at the demand nodes, due to some attack or disturbance to the network. We formulate a model, based on AC…
Forward - Backward Greedy Algorithms for Atomic Norm Regularization
Nikhil Rao, Parikshit Shah, Stephen Wright
In many signal processing applications, the aim is to reconstruct a signal that has a simple representation with respect to a certain basis or frame. Fundamental elements of the ba…
Asynchronous Stochastic Coordinate Descent: Parallelism and Convergence Properties
Ji Liu, Stephen J. Wright
We describe an asynchronous parallel stochastic proximal coordinate descent algorithm for minimizing a composite objective function, which consists of a smooth convex function plus…