Jorge Garcia

Jorge Garcia
University of Oviedo | UNIOVI · Department of Electrical, Electronic, Computers and Systems Engineering

Ph.D. Electronics Engineering

About

171
Publications
21,558
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2,876
Citations
Additional affiliations
November 2000 - present
Universidad de Oviedo
Education
November 2000 - June 2003
University of Oviedo
Field of study
  • Electrical Engineering

Publications

Publications (171)
Chapter
Vertical transportation in buildings (elevators, vertical conveyors, escalators, etc.) moves more than one billion people worldwide every day, accounting for a significant portion of the energy consumption of an average building. This work discusses the operation of an energy management system in a hybrid energy storage system for an elevator in a...
Article
Full-text available
This work discusses a novel set of alternate implementations of isolated gate driver circuits for power electronic transistors. The proposed topologies for the driver have been designed specifically for SiC power MOSFET. Three different solutions are discussed, all of them providing the required gate turn-on and turn-off command signal with galvani...
Article
This paper explores the use of a variable inductor as a reactive element for energy transfer in a Dual-Active-Bridge (DAB) converter. By using a controlled variable inductor, the optimal switching region in the operation of the phase-shift DAB can be extended, and thus high efficiencies can be achieved over wider load ranges compared to the traditi...
Article
This paper presents a study to improve the inductance calculation of magnetic components in power converters, of particular interest in the case of applications using variable inductors. In order to increase the accuracy of the estimation of the reluctance paths, several factors have been taken into consideration, such as: the permeability definiti...
Article
Full-text available
This paper proposes and develops a circuit-based model aiming to simulate variable magnetic power elements in power electronic converters. The derived model represents the magnetic element by a reluctance-based equivalent circuit. The model takes into consideration device core losses, with the main emphasis given to hysteresis losses, which are mod...
Article
Full-text available
This work presents a fault ride-through control scheme for a non-isolated power topology used in a hybrid energy storage system designed for DC microgrids. The hybrid system is formed by a lithium-ion battery bank and a supercapacitor module, both coordinated to achieve a high-energy and high-power combined storage system. This hybrid system is con...
Conference Paper
This work shows the development of a software tool that provides realistic operation power profiles in elevators for residential and public buildings applications. The implemented tool carries out a kinematic, dynamic and energetic analysis of the system, as a function of operational variables in the system. Therefore, the final load profile is a f...
Conference Paper
Battery energy storage systems are increasingly used to stabilize and balance energy supply systems. For stationary applications, as UPS, electrochemical battery modules are often used, being Li - Ion and lead acid the most popular choice mostly due to power ranges, energy capacity and reversible capability. The present paper is focused in the desi...
Article
A novel implementation of an isolated gate driver for power switches is proposed in this study. The driver is bespoke designed for SiC power mosfet s. The proposal achieves the main driver characteristics—isolation capability, gate switching command, and power transfer to the secondary side by using a unique magnetic transformer. The resulting si...
Article
Full-text available
In this paper, the optimization of the power and control stages of a previously proposed topology for an off-line LED electronic driver is presented. The full system avoids the use of electrolytic capacitors at the D C link, therefore increasing the lifespan and reliability of the driver. As a consequence of having a relatively small capacitance, t...
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Full-text available
Energy management control is essential to microgrids (MGs), especially to single-phase ones. To handle the variety of distributed generators (DGs) that can be found in a MG, e.g., renewable energy sources (RESs) and energy storage systems (ESSs), a coordinated power regulation is required. The latter are generally battery-based systems whose lifeti...
Article
This paper deals with the AC and DC dynamic voltage control in a hybrid DC/AC Microgrid (MG) with central and distributed Battery Energy Storage Systems (BESSs), applying a power sharing mechanism between the different devices in the MG. The MG is composed by a multiport transformation center and two fixed frequency 3 phase AC Nanogrids (NGs) coupl...
Conference Paper
This paper deals with the dynamic control of the DC bus voltage and the AC voltage magnitude and frequency in a hybrid DC/AC Microgrid (MG). In order to allow a high penetration of renewable energies, provide an increased system reliability during islanding and reduce the dependency on the mains, Energy Storage Systems (ESSs) are included in both t...
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Full-text available
In this work, an in-depth investigation was performed on the properties of the half-bridge current-source (HBCS) bidirectional direct current (DC)-to-DC converter, used to interface two DC-link voltage sources with a high-voltage-rating mismatch. The intended implementation is particularly suitable for the interfacing of a supercapacitor (SC) modul...
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Full-text available
This paper is focused on determining the efficiency dependency on the switching frequency for a solid state transformer (SST) with one of the ports connected to an energy storage device (Lithium-Ion battery). Some contributions for measuring the efficiency/losses for different power converter structures for energy storage applications can be found...
Article
This paper is focused on the control strategies for non-isolated Hybrid Energy Storage Systems in power support applications for microgrids and nanogrids. The hybrid storage system under analysis consists of two storage units with significantly different ratings and characteristics. These units are interfaced to the main system through dedicated po...
Conference Paper
This work proposes a solution for implementing an isolated gate driver for GaN HEMTs based on the previous topology for SiC power MOSFETs. The isolation of the gate driver is realised by the single transformer topology with double winding in the secondary side. The Bi-level HF Amplitude Modulation scheme is retained to avoid the core saturation as...
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Full-text available
This work carries out a comparison of non-isolated topologies for power electronic converters applied to Hybrid Energy Storage Systems. At the considered application, several options for three-port circuits are evaluated when interfacing a DC link with two distinct electrical energy storage units. This work demonstrates how the proposed structure,...
Conference Paper
In this paper, a full model to simulate variable magnetic elements in power electronic converters is developed. The derived model is based on the reluctance equivalent circuit of magnetic systems. Specifically, the model considers core losses, determined through Jiles-Atherton hysteresis model, and Eddy current losses obtained using Dowell empirica...
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Full-text available
This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side currents and the grid-side voltage. This configuration m...
Article
This paper proposes a novel solution for transient frequency compensation in weak 3-phase Microgrids (MGs) based on a Luenberger observer and a transient frequency detector. Unlike in conventional grids, the low inertia of the generators coupled to a MG could make their rotor speeds to be affected by load changes, varying the grid frequency and com...
Conference Paper
This paper deals with the AC and DC dynamic voltage control in a hybrid DC/AC Microgrid (MG) with central and distributed Battery Energy Storage Systems (BESSs), applying a power sharing mechanism between the different devices in the MG. The MG is composed by a multiport transformation center and two fixed frequency 3 phase AC Nanogrids (NGs) coupl...
Conference Paper
The present work proposes a solution for an isolated gate driver suitable for SiC MOSFETs. The driver is implemented by means of two small magnetic transformers, to provide the turn-on and turn-off gate signals, as well as the power required for an adequate gate control. The operation is based on the modulation of the PWM pulses with a high frequen...
Conference Paper
This work proposes a solution for an isolated gate driver for SiC MOSFETs, based on a magnetic transformer that simultaneously provides to the secondary side the turn-on and turn-off gate signals and the power required for an adequate gate control. This avoids the use of a dedicated DC-DC isolated converter and optocoupler. The original pulse signa...
Conference Paper
In this work, a Fault Ride-Through control scheme for a non-isolated power topology for Hybrid Energy Storage Systems in a DC microgrid is presented. The Hybrid System is created from a Lithium-Ion Battery and a Supercapacitor Module coordinated to achieve a high-energy and high-power storage system; it is connected to a DC link to interface to the...
Conference Paper
This work proposes a non-isolated power electronic topology to interface two distinct electrical energy storage units to a DC link, resulting in a Hybrid Storage System. The proposed solution, called Series-Parallel Connection, allows for interfacing these three ports in a simple, compact and reliable approach, based on the standard configuration o...
Conference Paper
This work focuses on the control strategies for different configurations of Non-Isolated Hybrid Energy Storage Systems. Basic strategies are proposed, studied and compared. Parting from the standard parallel connection of bidirectional boost converter in hybrid storage systems, a comparison with alternate topologies is presented. These alternative...
Conference Paper
This work explores the Series-Parallel Connection of a Low Voltage Supercapacitor Module to obtain a Hybrid Energy Storage System for grid support applications. The Hybrid System is formed by the Supercapacitor Module itself, intended to ensure fast performance upon peak power requirements, together with a battery that provides the energy requireme...
Conference Paper
This paper deals with the design of a Hybrid Energy Storage System (HESSs) for electric transportation such as Electric/Hybrid Vessel and Electric/Hybrid Train. The association of more than one Energy Storage Systems (ESSs) e.g., batteries which have different dynamics permit to take the advantages of the characteristics of both ESSs obtaining simu...
Article
This paper presents a multifunctional bidirectional converter applied to street lighting and photovoltaic (PV) microgeneration systems. The proposed converter works as an electronic driver supplying a street lighting luminaire based on light emitting diodes (LEDs) at night, from ac single-phase mains with high power factor and reduced harmonic dist...
Conference Paper
This paper defines, explains and implements a unified switching pattern for the switches in a bidirectional Discontinuous Conduction Mode (DCM) Flyback converter, used for connecting the individual elements of a street lighting system to the mains facility. In every individual element, the DC bus links the different existing stages, such as lamp dr...
Conference Paper
Most common Power Factor Correction (PFC) solutions for low power applications, when galvanic isolation is required, involve the use of discontinuous conduction mode (DCM) dc to dc topologies. The control is generally based on fixed duty ratio operation, or at best, on a classic low-bandwidth duty-ratio control. Considering public lighting systems,...
Conference Paper
Full-text available
This paper proposes a solution for the transient grid frequency drift that occurs when active power transients take place in weak grids. Microgrids (MGs) are by definition weak grids, exhibiting a low inertia and high impedance which make them prone to contingencies that compromise the grid quality and stability. Particularly, the low inertia of th...
Article
There is currently a trend in power electronics to avoiding the use of electrolytic capacitors in LED drivers, provided that their expected life span is much lower than that of the LEDs, thus reducing the reliability of the entire LED fixture. This paper presents an optimization study about the determination of the minimal bus capacitance needed fo...
Article
High-frequency copper losses, or copper losses produced during switching in switching-mode power supplies, are very much related to variations of the magnetic field distribution within the core window. When operating at high frequency, the current flowing through the windings of a magnetic component experiences redistribution across the section of...
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Full-text available
This work presents a multifunctional bidirectional converter for street lighting systems and grid tie inverter applications. The proposed converter works as grid-tie inverter injecting energy into the main, from photovoltaic panels, during the day, and it operates as an electronic driver supplying a street lighting based on LEDs luminaire during th...
Article
This paper presents a new control method and a detailed project methodology for the optimized connection method of two converters, aiming to reduce the redundant power processing, in order to supply high-power light-emitting diodes (LEDs) with reduced capacitance and high efficiency, directly from the ac line. This connection method allows dealing...
Article
The objective of this paper is to investigate the properties of the Half Bride Current Source bidirectional DC to DC converter used to interface supercapacitors with batteries in a hybrid storage system. This work focuses on the benefits of applying synchronous rectification to the switches of the primary and the secondary side, both in terms of ef...
Conference Paper
This paper presents a multifunctional bidirectional converter. The proposed converter works as a grid-tied inverter, injecting power coming from a PV subsystem to the AC mains in the daytime hours, but also supplies energy to a LED-based street lighting system at night. The topology is based on the integration of two Flyback converters thus allowin...
Conference Paper
This paper deals with the estimation and decoupling of grid impedance and LCL filter parameters variation using signal injection techniques and Luenberger type observer. When integrating a power converter in the AC grid as an interface for any Distributed Generation Systems (DGS) or other grid quality compensator like Active Power Filters (APF) or...
Conference Paper
This paper proposes the basic average model and the design of the control system for the Half Bridge Current Source (HBCS) Bidirectional DC to DC Converter. This converter is intended to interface a High Voltage DC link and a Low Voltage DC Storage Device in transportation applications. Firstly, the basics of the converter operation, high-level con...
Article
A novel high pressure sodium (HPS) lamp model is proposed. The proposed model is particularised for 150 W HPS lamps, providing a powerful tool for simulating the behaviour of such lamps operating with low-frequency electromagnetic ballasts or high-frequency switching electronic ballasts. Simulations and experimental results are provided for verific...
Conference Paper
Full-text available
Self-supply consists on turning the electrical consumers in prosumers; they produce a part or all the energy that they consume. In Spain, the regulatory frame that affects these kind of facilities has not been published yet. This regulatory gap causes different law interpretations that lead to misunderstandings between prosumers and electrical comp...
Conference Paper
Parallel connection of several LED strings is a practical way to reduce the overall lamp voltage when a large number of emitters is needed. However, this connection might lead to high current mismatches between strings due to the dispersion of characteristics that even binned devices feature. Several techniques have been proposed in order to elimin...
Conference Paper
Full-text available
Electric vehicles are one of the major keystones on the development of a more sustainable society. However, nowadays there are a number of obstacles for the full development of the Electric Vehicles and their necessary infrastructure. These hurdles tend to slow down the implementation of a technology that from other aspects can be considered as mat...
Conference Paper
Full-text available
This work proposes an electronic driver for street lighting systems integrated to renewable energy. In recent lighting applications, the use of micro renewable generators in lighting points makes necessary the use of special electronics to handle the bidirectional energy flow in the ballast. The proposed input stage is a topology based on the integ...
Conference Paper
Power regulation of all converter units in a micro-grid should not be only determined by load demand, but also by the available power of each unit, i.e. a converter fed by a battery. Energy management control is essential in order to handle the variety of prime movers which may include different types of renewable energy sources (RES) and energy st...
Conference Paper
This paper presents a methodology to improve the line current THD of a distribution line configuration with multiple non-linear loads, by means of a simple algorithm based on sensing only the voltage at the Point of Common Coupling (PCC), thus avoiding the use of line current measurement. Firstly, the effect of conventional low frequency electromag...
Conference Paper
Full-text available
This work proposes an electronic driver for street lighting systems integrated to renewable energy. In recent lighting applications, the use of micro renewable generators in lighting points makes necessary the use of special electronics to handle the bidirectional energy flow in the ballast. The proposed input stage is a topology based on the integ...
Conference Paper
Full-text available
This paper presents the experience of applying project-based learning (PBL) on power electronics, in the context of two official Master degree courses. The discussion covers both strategic and implementation topics, from the initial conception of the Master and the subject, to practical implementation issues. The final conclusions show recommendati...
Article
This paper proposes an electronic driver for public lighting systems. The input stage is based on the integration of two flyback converters with different polarities, in order to avoid the use of the input diode bridge rectifying stage. The output stage is a boost converter with an output current control. The proposed circuit is introduced and anal...
Article
In the prior literature, the small-signal incremental impedance of fluorescent lamps has been characterized using a single-pole single-zero transfer function. This transfer function provides a good estimation of the lamp dynamics at rated power. However, when this model is used at low power levels, the accuracy is severely reduced, particularly at...
Conference Paper
Full-text available
This paper presents an electronic ballast to supply a 70W high pressure sodium lamp. The electronic ballast consists on a single-stage converter that integrates a buck converter to provide power factor correction and two flyback converters to supply the lamp, with low frequency square waveform, in order to avoid the acoustic resonance phenomenon oc...
Conference Paper
This paper presents a converter structure applied to supply high power Light Emitting Diodes (LEDs) from the mains in a street lighting system, based on the Reduced Redundant Power Processing (R2P2) principle. To guarantee high power factor and low harmonic injection a buck-boost operating in Discontinuous Conduction Mode (DCM) is employed as Power...
Conference Paper
One of the main concerns when designing dimming ballasts is the stability range that can be obtained in practical designs. Some applications require the output power to be reduced below 20% of its nominal value. The small-signal model of fluorescent lamps has proven to be a useful tool to describe the dynamic behavior of fluorescent lamps. These mo...
Conference Paper
This paper deals with a topology for an off-line LED electronic driver. The use of electrolytic capacitors in the DC link is avoided, therefore extending lifespan and reliability. Given that the resulting output capacitance of the PFC stage is relatively small, a high LF ripple appears at the DC-link. This work proposes the use of a current-fed bid...
Conference Paper
This paper presents a converter structure applied to supply high power Light Emitting Diodes (LEDs) from the mains in a street lighting system, based on the Reduced Redundant Power Processing (R2P2) principle. It is used a Buck-Boost operating in Discontinuous Conduction Mode (DCM) as Power Factor Corrector (PFC) to guarantee high power factor and...