Results 51 to 60 of about 14,952,911 (382)

Numerical study on the load direction effect on the performance of tilting pad-journal gas bearing

open access: yesJournal of Advanced Mechanical Design, Systems, and Manufacturing, 2014
This paper quantitatively presents the effect of load directions on the static performance of gas titling pad-journal bearing (TPJB). The gas film thickness is determined in a subsystem composed of the rotor and one pad.
Tianwei LAI   +4 more
doaj   +1 more source

Operating Power Grids with Few Flow Control Buses

open access: yes, 2015
Future power grids will offer enhanced controllability due to the increased availability of power flow control units (FACTS). As the installation of control units in the grid is an expensive investment, we are interested in using few controllers to ...
Leibfried, Thomas   +7 more
core   +1 more source

Robust Convergence of Power Flow using Tx Stepping Method with Equivalent Circuit Formulation

open access: yes, 2017
Robust solving of critical large power flow cases (with 50k or greater buses) forms the backbone of planning and operation of any large connected power grid.
Hug, Gabriela   +4 more
core   +1 more source

PowerModels.J1: An Open-Source Framework for Exploring Power Flow Formulations [PDF]

open access: yesPower Systems Computation Conference, 2017
In recent years, the power system research community has seen an explosion of novel methods for formulating and solving power network optimization problems.
Carleton Coffrin   +4 more
semanticscholar   +1 more source

Linear/Quadratic Programming-Based Optimal Power Flow using Linear Power Flow and Absolute Loss Approximations

open access: yes, 2017
This paper presents novel methods to approximate the nonlinear AC optimal power flow (OPF) into tractable linear/quadratic programming (LP/QP) based OPF problems that can be used for power system planning and operation.
Demiray, Turhan, Fortenbacher, Philipp
core   +1 more source

A virtual power plant model for time-driven power flow calculations [PDF]

open access: yes, 2017
This paper presents the implementation of a custom-made virtual power plant model in OpenDSS. The goal is to develop a model adequate for time-driven power flow calculations in distribution systems.
Guerra Sánchez, Luis Gerardo   +1 more
core   +2 more sources

Unified Power Flow Controller for Power Flow Control

open access: yes, 2021
This paper presents the introduction of Unified Power Flow Controller (UPFC) for solving power flow control problem in power system. The Unified Power Flow Controller is a distinctive FACTS (Flexible AC Transmission Systems) device that is the utmost sophisticated and complex power electronic equipment and has developed for the control and optimization
openaire   +1 more source

Optimal Power Flow for AC–DC Grids: Formulation, Convex Relaxation, Linear Approximation, and Implementation

open access: yesIEEE Transactions on Power Systems, 2019
HVDC is becoming an increasingly important part of the present day transmission systems. Accurate models of active and reactive power control capabilities of HVDC converter stations are required to analyze the operation of power systems consisting of ac ...
H. Ergun   +3 more
semanticscholar   +1 more source

Hydrogen Production by Supercritical Water Gasification of Biomass with Homogeneous and Heterogeneous Catalyst

open access: yesAdvances in Condensed Matter Physics, 2014
Biomass gasification in supercritical water is a clean and efficient way to convert biomass to hydrogen-rich gaseous products. Appropriate catalyst can lower the reaction temperature to guarantee the technological and economic feasibility.
Hui Jin   +4 more
doaj   +1 more source

Optimal Power Flow Control by Rotary Power Flow Controller

open access: yesAdvances in Electrical and Computer Engineering, 2011
This paper presents a new power flow model for rotary power flow controller (RPFC). RPFC injects a series voltage into the transmission line and provides series compensation and phase shifting simultaneously. Therefore, it is able to control the transmission line impedance and the active power flow through it.
KAZEMI, A., HADDADI, A. M.
openaire   +2 more sources

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