Francisco de León
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Experimental Verification of a Time-Domain Load Identification Method for Single-Phase Circuits Open
This paper presents experimental validation of a time-domain load parameter determination method for single-phase circuits. The verification is performed in a state-of-the-art smart grid laboratory equipped with power hardware and real-tim…
Effects of Installing Different Types of Cooling Fins on the Cold Side of a Thermoelectric Power Generation Device on the Thermal Efficiency and Exergy Efficiency of Power Cable Surface Waste Heat Recovery Open
This study investigates the thermal efficiency and exergy efficiency of a thermoelectric power generation device for recovering power cable surface waste heat. Numerical simulations are conducted to analyze the impact of different types of…
The future belongs to dc: Edison will beat Tesla after all Open
For about a hundred years following the war of the currents (between Edison and Tesla), settled at the end of the 19th century in favor of ac, transmission and distribution (T&D) systems have followed the well-established architecture stil…
Electrostatic shielding of transformers Open
Toroidal transformers are currently used only in low-voltage applications. There is no published experience for toroidal transformer design at distribution-level voltages. Toroidal transformers are provided with electrostatic shielding to …
A self-organizing multi-agent system for distributed voltage regulation Open
This paper presents a distributed voltage regulation method based on multi-agent system control and network self-organization for a large distribution network. The network autonomously organizes itself into small subnetworks through the ep…
Distributed Dual Model for High-Frequency Transformer Windings: Electromagnetic Transients and Solid State Transformers Open
This paper presents a novel model for transformer windings to accurately represent the duality between electrical and magnetic circuits. The model can be used for the calculation of high-frequency transients in power systems and the design…
Determination of Instantaneous Powers From a Novel Time-Domain Parameter Identification Method of Non-Linear Single-Phase Circuits Open
This paper proposes a systematic method for the identification of the load circuit parameters (say the R, L, and C elements) based only on the information of the instantaneous volt- age and current measured at the point of common coupling …
Hepatolithiasis long term complication of choledochal cyst resection: Rase report Open
Introduction: Choledochal cysts (CCs) are uncommon with an incidence that ranges from 1 in 100,000-150,000 in Western populations, to 1-1,000 in some Asian populations.The cyst can become complicated with stone disease, pancreatitis, chola…
Load Estimation of Complex Power Networks from Transformer Measurements and Forecasted Loads Open
This paper presents a load estimation method applicable to complex power networks (namely, heavily meshed secondary networks) based on available network transformer measurements. The method consists of three steps: network reduction, load …
Smart load management of distribution‐class toroidal transformers using a dynamic thermal model Open
Thermal behaviour is a prime factor in the accurate performance assessment of power transformers as well as in the prediction of their life expectancy. This study presents a computer modelling tool based on an electro‐thermal equivalent ci…
View article: Duality-Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part II: Complementary Modeling Guidelines
Duality-Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part II: Complementary Modeling Guidelines Open
This two-part paper is intended to clarify definitions in dual transformer modeling that are vague, provide accurate modeling guidelines, clarify misconceptions about numerical instability, provide a unified dual model for a specific type …
View article: Duality Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part I: Topological Models
Duality Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part I: Topological Models Open
The objective of this two-part paper is to provide clarity to physical concepts used in the field of transformer modeling, to dispel common misconceptions regarding numerical instabilities, and to present unified modeling techniques for lo…