Transactions on Energy Systems and Engineering Applications <p><em>Transactions on Energy Systems and Engineering Applications</em> is an international journal that promotes research to solve real-life problems. The goal is to publish the highest quality research regarding applied mathematics and energy systems that cover all the engineering areas for solving complex and current issues. The Journal selects the articles based on high-quality standards, and it is edited by the Universidad Tecnológica de Bolívar.</p> <p><strong>ISSN:</strong> 2745-0120 (<em>Online</em>)<br><a href="" rel="license"><img src="" alt="Licencia Creative Commons"></a></p> en-US (Oscar Danilo Montoya Giraldo) (Laura Castro Vélez) Wed, 16 Dec 2020 00:00:00 +0000 OJS 60 A Comparative Study of Signal Analysis Methods Applied in the Detection of Instantaneous Frequency <p>The smart grid concept is being applied more and more frequently and this is due to the need to integrate all the components that are part of power systems today, starting from generation units, storage systems, communications and connected loads. Non-linear and non-stationary signals have been obtained in this type of systems, which have high penetration of non-conventional energy sources (NCSRE) and non-linear loads. The power quality criterion has had to be adapted to the new conditions of the electrical systems and this has led to the need to search for new analysis methodologies for the acquired signals. In this article we present a review on non-linear and non-stationary signal analysis methods in electrical systems with high NCSRE penetration. To this end we explore the application of the Hilbert-Huang Transform (HHT), Wavelet Transform (WT) and Wigner-Ville Distribution (WVD), exposing each of the advantages and disadvantages of these methods. To validate the methodology, we have selected some synthetic signals that adequately describe the typical behaviors in these systems.</p> Maximiliano Bueno-López, Johinner Mauricio Sanabria Villamizar Copyright (c) 2020 Transactions on Energy Systems and Engineering Applications Wed, 16 Dec 2020 00:00:00 +0000 Metaheuristic Optimization Methods for Optimal Power Flow Analysis in DC Distribution Networks <p>In this paper is addressed the optimal power flow problem in direct current grids, by using solution methods based on metaheuristics techniques and numerical methods. For which was proposed a mixed integer nonlinear programming problem, that describes the optimal power flow problem in direct current grids. As solution methodology was proposed a master–slave strategy, which used in master stage three continuous solution methods for solving the optimal power flow problem: a particle swarm optimization algorithm, a continuous version of the genetic algorithm and the black hole optimization method. In the slave stages was used a methods based on successive approximations for solving the power flow problem, entrusted for calculates the objective function associated to each solution proposed by the master stage. As objective function was used the reduction of power loss on the electrical grid, associated to the energy transport. To validate the solution methodologies proposed were used the test systems of 21 and 69 buses, by implementing three levels of maximum distributed power penetration: 20%, 40% and 60% of the power supplied by the slack bus, without considering distributed generators installed on the electrical grid. The simulations were carried out in the software Matlab, by demonstrating that the methods with the best performance was the BH/SA, due to that show the best trade-off between the reduction of the power loss and processing time, for solving the optimal power flow problem in direct current networks.</p> Luis Fernando Grisales Noreña, Oscar Daniel Garzón Rivera, Jauder Alexander Ocampo Toro, Carlos Andres Ramos Paja, Miguel Angel Rodriguez Cabal Copyright (c) 2020 Transactions on Energy Systems and Engineering Applications Thu, 17 Dec 2020 18:32:58 +0000 Control Methods for Single-phase Voltage Supply with VSCs to Feed Nonlinear Loads in Rural Areas <p>This paper addresses the problem of sinusoidal voltage generation in linear loads using a voltage source inverter (VSI). The port-Hamiltonian structure in open-loop is used to design a passivity-based controller with proportional-integral gains (PI-PBC) in order to develop the control strategy. The main advantage of using passivity-based controllers corresponds to the possibility of guaranteeing asymptotic stability by transforming the trajectory tracking problem into a regulation control one. In addition to the PI-PBC, a linear load estimator is employed based on an integral formulation to determine the value of the equivalent conductance in the load, which reduces the number of current sensors. Numerical validations demonstrate that the sinusoidal voltage provided by the VSI to the load has a tracking error lower than $1~\%$, with harmonic distortions lower than $2.6~\%$, both for voltage and currents in the load. All the simulations were conducted in MATLAB/Simulink using the SimPowerSystems library version 2017<em>a</em>.</p> Walter Julián Gil Gonzalez, Sara Yulieth Bocanegra, Federico M. Serra, Maximiliano Bueno-López, Guillermo Luciano Magaldi Copyright (c) 2020 Transactions on Energy Systems and Engineering Applications Thu, 17 Dec 2020 00:00:00 +0000 Análisis de estabilidad de convertidores de segundo orden con la metodología de optimización de suma de polinomios cuadráticos <p>This paper presents a non-linear method based on sum-of-squares (SOS), to determine the stability of equilibrium points for the Buck, Boost, Buck-Boost and non-inverter Buck-Boost converters. These converters share a similar structure with a PI controller to regulate the output voltage. A quadratic Lyapunov function is proposed in all cases, and the conditions for stability are evaluated using convex optimization based on SOS models. The methodology is useful for academic purposes but also in practical applications like DC microgrids. Simulation results shows the advantages of the proposed method.</p> Jhon Jairo Herrera-Pérez, Alejandro Garcés-Ruiz Copyright (c) 2020 Transactions on Energy Systems and Engineering Applications Thu, 17 Dec 2020 18:43:38 +0000