Alejandro Garcés
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View article: Large-scale single-cell phylogenetic mapping of clonal evolution in the human aging esophagus
Large-scale single-cell phylogenetic mapping of clonal evolution in the human aging esophagus Open
The human somatic genome evolves throughout our lifespan, producing mosaic individuals comprising clones harboring different mutations across tissues. While clonal expansions in the hematopoietic system have been extensively characterized …
View article: An energy management system for PV-STATCOMs in power distribution networks via a complex-domain SDP relaxation
An energy management system for PV-STATCOMs in power distribution networks via a complex-domain SDP relaxation Open
This article proposes an efficient energy management system for optimally scheduling distributed energy resources based on photovoltaic static synchronous compensators (PV-STATCOMs) in medium-voltage distribution networks. The complete non…
View article: Optimal parameter calibration for multiple droop controls on inverter-dominated power systems
Optimal parameter calibration for multiple droop controls on inverter-dominated power systems Open
Inverter-dominated electrical power systems represent the future of the electrical sector worldwide. Currently, grid-forming inverters are presented as a solution to issues related to auxiliary services to ensure grid stability. These inve…
View article: State estimation of DC microgrids using manifold optimization and semidefinite programming
State estimation of DC microgrids using manifold optimization and semidefinite programming Open
DC microgrids are becoming more common in modern systems, so computation methodologies such as the power flow, the optimal power flow, and the state estimation require being adapted to this new reality. This paper deals with the latter pro…
View article: Passivity-Based Model-Predictive Control for the Permanent Magnet Synchronous Machine
Passivity-Based Model-Predictive Control for the Permanent Magnet Synchronous Machine Open
Context: This study focuses on advanced control techniques for permanent magnet synchronous machines (PMSMs), which are crucial in various industrial applications due to their efficiency and precise control requirements. Passivity-based co…
View article: Stability analysis for an ad-hoc model predictive control in DC/DC converters with a constant power load
Stability analysis for an ad-hoc model predictive control in DC/DC converters with a constant power load Open
This paper presents a stability analysis for a horizon-one continuous control set model predictive control (MPC) for DC/DC converters connected to a constant power loads (CPLs). Different MPC approaches have been previously presented, each…
View article: A Review of Matrix Algebra for Power and Energy Applications
A Review of Matrix Algebra for Power and Energy Applications Open
This report presents a brief review of matrix algebra and its implementation in Julia for power and energy applications. First, we present basic examples of data visualization, followed by conventional operations with matrices and vectors.…
View article: Electricity Generation under the Climate Change Situation in Latin America: Trends and Challenges
Electricity Generation under the Climate Change Situation in Latin America: Trends and Challenges Open
In a scenario of energy inequality, countries require stability for development and quality of life for their inhabitants. This paper addresses the reality of access to electrical energy and the effect of climate change on the potential of…
View article: Passivity-Based Control PI for the Versatile Buck-Boost (VBB) Converter
Passivity-Based Control PI for the Versatile Buck-Boost (VBB) Converter Open
Voltage and current requirements imposed by direct current loads are highly demanding in modern applications such as microgrids and electric vehicles. High-performance converters and controllers are required for these applications. The ver…
View article: Generic optimal power flow for active distribution networks
Generic optimal power flow for active distribution networks Open
Active distribution networks (ADN) may operate in different modes according to the generation demand balance and the capacity of the primary grid for imposing a constant frequency. Conventionally, a customized optimization model is used fo…
View article: An efficient operation strategy for dispersed generation sources in bipolar asymmetric DC distribution networks: a sequential quadratic approximation
An efficient operation strategy for dispersed generation sources in bipolar asymmetric DC distribution networks: a sequential quadratic approximation Open
This paper proposes a sequential quadratic optimization of the optimal power flow (OPF) in bipolar direct current (DC) grids. This formulation is based on Taylor’s expansion applied to the non-convex constraints, thus transforming them int…
View article: Power aggregator in active distribution networks using IoTv
Power aggregator in active distribution networks using IoTv Open
This paper presents an Internet of Things (IoT) architecture for a power aggregator of energy resources in active distribution networks. Two types of algorithms are evaluated and compared: centralized and decentralized control. The former …
View article: Three-Phase Power Flow Tool for Electric Distribution Grids: A Julia Implementation for Electrical Engineering Students
Three-Phase Power Flow Tool for Electric Distribution Grids: A Julia Implementation for Electrical Engineering Students Open
Most of the concepts involved in Electrical Engineering have been developed from the 20th century to the present day. One of the most popular studies in this field is the power flow problem for electrical systems composed of multiple nonli…
View article: A second-order conic approximation to solving the optimal power flow problem in bipolar DC networks while considering a high penetration of distributed energy resources
A second-order conic approximation to solving the optimal power flow problem in bipolar DC networks while considering a high penetration of distributed energy resources Open
This article presents an optimal power flow (OPF) formulation based on the branch flow model for bipolar DC grids with asymmetric loading. The proposal considers the power injection formulation of the OPF to obtain the branch flow model eq…
View article: A Review of Communication Protocols and Control Strategies in DC Microgrids: An Experimental Validation Focus
A Review of Communication Protocols and Control Strategies in DC Microgrids: An Experimental Validation Focus Open
Given the growing presence of microgrids, it is necessary to investigate how communication protocols impact their behavior. The study of DC microgrid topologies is of great importance due to their fast proliferation and the fact that they …
View article: An energy management system model with power quality constraints for unbalanced multi-microgrids interacting in a local energy market
An energy management system model with power quality constraints for unbalanced multi-microgrids interacting in a local energy market Open
As multi-microgrids become readily available, some limited models have been proposed that study operational and power quality constraints with local energy markets independently. This paper proposes a convex optimization model of an energy…
View article: Stability Analysis of Multi-Converter Power Systems with Angle Feedback
Stability Analysis of Multi-Converter Power Systems with Angle Feedback Open
This paper presents a stability analysis for inverter-based renewable resources in multi-converter power systems. Stability conditions are obtained based on the port-Hamiltonian structure of the droop control in grid-forming converters. We…
View article: An energy management system model with power quality constraints for unbalanced multi-microgrids interacting in a local energy market
An energy management system model with power quality constraints for unbalanced multi-microgrids interacting in a local energy market Open
As multi-microgrids become readily available, some limited models have been proposed that study operational and power quality constraints with local energy markets independently. This paper proposes a convex optimization model of an energy…
View article: Stochastic Convex Optimization for Optimal Power Factor Correction in Microgrids with Photovoltaic Generation
Stochastic Convex Optimization for Optimal Power Factor Correction in Microgrids with Photovoltaic Generation Open
This research focused on the development of a methodology for calculating the optimal power factor (OPF) in microgrids with the photovoltaic generation, in order to use solar inverters as reactive compensators, which will change their powe…
View article: An Overview of the Colombian Power System
An Overview of the Colombian Power System Open
The Colombian power system is facing a transition from hydro-thermal generation to a diversified mix of hydro, solar, and wind energy. This paper presents an overview of the current situation and the challenges of transitioning to a more s…
View article: Power Flow Solution in Bipolar DC Networks Considering a Neutral Wire and Unbalanced Loads: A Hyperbolic Approximation
Power Flow Solution in Bipolar DC Networks Considering a Neutral Wire and Unbalanced Loads: A Hyperbolic Approximation Open
This paper addresses the problem of the power flow analysis of bipolar direct current (DC) networks considering unbalanced loads and the effect of a neutral wire, which may be solidly grounded or non-grounded. The power flow problem is for…
View article: Model Predictive Control for Stabilization of DC Microgrids in Island Mode Operation
Model Predictive Control for Stabilization of DC Microgrids in Island Mode Operation Open
DC microgrid (DCMG) is a promising technology for integrating distributed resources, such as solar generation and energy storage devices, that are intrinsically DC. Recently, model predictive control (MPC) is one of the control techniques …
View article: Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$
Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$ Open
EuCd$_2$P$_2$ is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K…