OBJECTIVES/HYPOTHESIS To evaluate the osteoplastic flap (OPF) procedure for frontal sinus pathology at our institution, including indications, revisions, obliteration vs. nonobliteration, and obliteration materials. STUDY DESIGN Single-institution retrospective review from 1998 to 2013. METHODS Current Procedural Terminology codes identified all OPF procedures. Demographic data, diagnoses, ...

The set of optimization problems in electric power systems engineering known collectively as Optimal Power Flow (OPF) is one of the most practically important and well-researched subfields of constrained nonlinear optimization. OPF has enjoyed a rich history of research, innovation, and publication since its debut five decades ago. Nevertheless, entry into OPF research is a daunting task for th...

This paper is based on material presented at the IEEE 1995 Winter Power Meeting Panel Session on Challenges to OPF, sponsored by the IEEE Working Group on Operating Economics. The paper contains a brief summary of the session followed by summaries. INTRODUCTION J.A. Momob, Senior Member Howard University Washington, DC The increasing demand for an OPF tool for assessing state and recommended co...

A distributed active and reactive power control (DARPC) strategy based on the alternating direction method of multipliers (ADMM) is proposed for regional AC transmission system (TS) with wind farms (WFs). The DARPC optimizes distribution among WFs to minimize losses TS while tracking reference from operator (TSO), minimizes voltage deviation buses inside WF rated as well collection system. opti...

When uncontrollable resources fluctuate, optimal power flow (OPF), routinely used by the electric power industry to redispatch hourly controllable generation (coal, gas, and hydro plants) over control areas of transmission networks, can result in grid instability and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in par...

Distributed optimization for solving non-convex Optimal Power Flow (OPF) problems in power systems has attracted tremendous attention in the last decade. Most studies are based on the geographical decomposition of IEEE test systems for verifying the feasibility of the proposed approaches. However, it is not clear if one can extrapolate from these studies that those approaches can be applied to ...

In this work we have proposed an innovative and accurate solution for non-technical losses identification using the Optimum-Path Forest (OPF) classifier and its learning algorithm. Results in two datasets demonstrated that OPF outperformed the state of the art pattern recognition techniques and OPF with learning achieved better results for automatic nontechnical losses identification than recen...

In this paper we describe an Interior Point Method (IPM) to solve large scale NonLinear Programming (NLP) problems, tailored to the solution of a specialized Optimal Power Plow (OPF) formulation that uses bus voltages in rectangular coordinates. The distinctive feature of this OPF formulation is that the objective function and constraints are quadratic functions, and such quadratic properties a...

` i ABSTRACT The distribution grid is expected to change in the near future as a result of recent advancements in the field of smart grids. The future grid will accommodate generation and storage options, active consumer participation through demand response schemes, and the widespread installation of smart energy management systems. With more demand side participation, distributed generators, ...

A distributed optimal voltage control (DOVC) strategy based on the alternating direction method of multipliers (ADMM) is proposed for AC grid with source converter (VSC) DC connection and offshore wind farms (OWFs). The DOVC achieves global power distribution inside to minimize losses while minimizing bus deviation from rated value as well several OWFs. flow (OPF) VSC combined model predictive ...