Browsing by Author "Montoya Giraldo O.D."

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On Linear Analysis of the Power Flow Equations for DC and AC Grids with CPLs
(Institute of Electrical and Electronics Engineers Inc., 2019) Montoya Giraldo O.D.
This express brief presents an approximation of the power flow problem for alternating-current (ac) and direct-current (dc) distribution networks by using a linear representation of the hyperbolic constraints i=p/v ↔ II∗ = SV related to the power balance at each constant power load node. Taylor's or Laurent's series expansion methods are not required to obtain an equivalent linear power flow model. The proposed linear method allows us to achieve a high quality approximation of the power flow modeling without iterative procedures. Our simulation results show the accurate estimation of the voltage profile in distribution networks by the proposed linear approach in comparison to existing methods in specialized literature for ac and dc networks, including linear estimators or classical numerical methods, such as Gauss-Seidel and Newton-Raphson approaches. Numerical implementation of those approaches is carried out in the MATLAB 2017a programming environment. © 2004-2012 IEEE.
Optimal location and sizing of capacitors in radial distribution networks using an exact MINLP model for operating costs minimization
(World Scientific and Engineering Academy and Society, 2017) Montoya Giraldo O.D.; Grisales Noreña L.F.; Garrido Arévalo, Víctor Manuel
This paper presents an exact mixed-integer nonlinear programming (MINLP) model for optimal sizing and location of capacitor banks in radial distribution networks (RDN). The total operating costs of the RDN are minimized taking into account the classical restrictions of the electrical system, which are modeled by using a power flow formulation. Only fixed capacitor banks are considered in this paper. A commercial optimization package known as general algebraic modeling system (GAMS) is employed to implement the MINLP, ant its solution is obtained by CONOPT package. The effectiveness and robustness of the proposed mathematical model is tested in two RDNs with 10 and 33 nodes respectively. Additionally, three different demand scenarios are considered for simulation analysis. © 2017 World Scientific and Engineering Academy and Society. All Rights Reserved.