Analysis of the influence of switching related parameters in the dab converter under soft-switching

An analysis of a dual active bridge (DAB) converter under soft-switching mode in the whole operating range is presented in this paper. A detailed study of the impact ofthe transformer magnetizing inductance, LM,and snubber capacitance, Cxx, parameters on the soft-switching regions is carried out to obtain some design considerations. Simulation and experimental results which validate the theoretical analysis are also presented.Fil: Oggier, German Gustavo. Universidad Nacional de Rio Cuarto. Facultad de Ingenieria. Grupo de Elctronica Aplicada; ArgentinaFil: García, Guillermo. Universidad Nacional de Rio Cuarto. Facultad de Ingenieria. Grupo de Elctronica Aplicada; ArgentinaFil: Oliva, Alejandro Raul. Universidad Nacional del Sur. Departamento de Ingenieria Electrica y de Computadoras. Instituto; . Universidad Nacional del Sur. Departamento de Ingenieria Electrica y de Computadoras; Argentin

Evaluation of DC-AC single-phase solid-state transformers

This work presents an evaluation of three topologies of DC-AC single-phase solid-state transformers, for applications in electric microgrids. The main features of these topologies are galvanic isolation, capability to control the power flow bidirectionally, soft switching and unit power factor under open loop control. The principle of operation of each topology is described and the modulation strategy used is detailed. A comparison of the THDi of the current waveform injected into the grid, the power factor and the utilization factor of the semiconductor switches for each topology is presented. As a result, the most suitable topology for the integration of microgrids with high penetration of renewable energies to the grid is determined. Simulation results are presented to validate the theoretical analysis.Fil: Bosso, Jonathan Emmanuel. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Llomplat, Marcelo. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Oggier, German Gustavo. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Garcia, Guillermo. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentin

Analytical and Normalized Equations to Implement the Optimized Triple Phase-Shift Modulation Strategy for DAB Converters

A fully normalized algorithm to implement the optimal triple-phase-shift (TPS) modulation strategy of the dual active bridge (DAB) converter is proposed in this article. The algorithm evaluates three simple expressions that fit the optimal solutions obtained in recent works, which allows the algorithm to be implemented in real-time and valid for the whole operating range. As a result, the converter operates under zero voltage switching (ZVS) conditions and minimizes conduction losses. In addition, the algorithm considers the minimum current required to guarantee the ZVS condition that faces the undesired dead-band of switching devices effect. The proposal achieves a soft transition between any operation region and a fast closedloop response with no stability concern, presenting robustness under leakage inductance deviation. Finally, the algorithm presented in this article is verified with a 4-kW experimental prototype. Experimental results show that the algorithm proposed can be evaluated with less than 2.8 µs and allows soft transition between any operation region to be achieved. Besides, fast closedloop changes of 750 µs through all the operating ranges, keeping minimum rms current under ZVS, are shownPeer ReviewedPostprint (published version

Dynamic and steady-state modeling of modular input-series-output-series connected dual active bridge converters

Este trabajo presenta el modelado de un convertidor modular CC-CC basado en la conexión entrada serie - salida serie de dos celdas con convertidores con puentes duales activos. Esta configuración resulta interesante en aplicaciones en las cuales ambos puertos del convertidor deben soportar tensiones elevadas. A partir del análisis de las formas de onda de las principales variables eléctricas de cada una de las celdas, se obtienen las ecuaciones promediadas que permiten describir la dinámica del convertidor ante cambios significativos en las entradas de control del convertidor. El modelo promediado es linealizado entorno a un punto de funcionamiento del convertidor, obteniendose dos sistemas de ecuaciones que permiten analizar la influencia de los parámetros constructivos de las celdas en el comportamiento estático y dinámico del convertidor. Se presentan resultados de simulación y experimentales que permiten validar en el dominio temporal los modelos obtenidos, tanto en régimen permanente como transitorio, en todo el rango de transferencia de potencia del convertidor.This work presents a modular DC-DC converter modeling based on the input-series-output-series connection of two cells using dual active bridge converters. This configuration is interesting in applications in which both ports of the converter must withstand medium to high voltages. From the waveform analysis of the main electrical variables, the averaged equations are obtained to describe the large-signal dynamics of the converter. The averaged model is linearized around an operating point of the converter, obtaining two sets of equations from which the influence of each parameter on the static and dynamic behavior of the converter is analyzed. Simulation and experimental results allow the models obtained in the time domain to be validated, both in steady-state and transient conditions, in the full power range of the converter.Fil: Rodríguez, Federico. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; ArgentinaFil: Garrido, Daniel Oscar. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; ArgentinaFil: Núñez, Rubén. Universidad Nacional de Rafaela; ArgentinaFil: Oggier, German Gustavo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; ArgentinaFil: Garcia, Guillermo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentin

Boundary Control of Full-Bridge ZVS: Natural Switching Surface for Transient and Steady-State Operation

This paper presents the use of a high-performance boundary controller for the full-bridge zero-voltage-switching topology. An enhanced dynamic response is obtained by employing the natural switching surface (SS), which is thoroughly derived in the normalized geometrical domain. The advantages of the normalization are the simple graphical representation, the generality for any combination of parameters, and the mathematical simplicity. Recently, nonisolated basic topologies have benefited from advancements in boundary control. The analysis and derivation in this work bring the benefit of outstanding dynamic performance to this isolated topology. As demonstrated in this work, the relationship between the leakage and output filter inductances makes the formulation of the natural trajectories for isolated converters possible. The resulting SS provides an excellent dynamic response during start-up, reference change, and sudden output loading conditions. Experimental results are presented to illustrate the characteristics and advantages of the control scheme and the converter operation with fixed switching frequency.Fil: Oggier, German Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Departamento de Electricidad y Electrónica; ArgentinaFil: Ordonez, Martin. University Of British Columbia. Eléctrical Engineering And Computer Scien.dept.; Canad

High Efficiency DAB Converter Using Switching Sequences and Burst Mode

Dual active bridge converters enable bidirectional power flow in buck and boost operating modes. This paper presents an advanced switching sequence and burst-mode strategy to balance conduction, switching, and magnetic losses under light, medium, and heavy loading conditions, leading to improved operating efficiency. The implementation of the switching sequence employs the natural state-plane trajectories of the converter and contributes to higher efficiency and the ability to perform burst mode. The proposed switching sequences improve the overall efficiency of the converter by enabling soft switching and adjusting the frequency to match the minimum RMS transformer current in the full operating range. Furthermore, it incorporates a fully controlled burst-mode switching sequence for light loading conditions to further extend the efficiency gains. As a result, maximum efficiency is obtained by taking advantage of all the possible switching structures of the converter. The analysis provides insight into the natural trajectories of the converter, which produce soft-switching transitions and enable the converter structures to achieve the target operating point directly. Simulation and experimental results are presented to validate the benefits of the switching sequence and illustrate the burst-mode operation.Fil: Oggier, German Gustavo. Universidad Nacional de Río Cuarto. Facultad de Ingeniería. Grupo de Electrónica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Ordonez, Martin. University of British Columbia; Canad

Closed-Form Harmonic Compensation Using Resonant Controllers Applied to Four-Leg VSI

Harmonic compensation employing resonant controllers applied to voltage source inverters generally requires complex techniques or a trial-and-error process to design the controller parameters. This paper proposes a closed-form solution for designing digital Proportional-Resonant controllers applied to three-phase four-leg inverters. The proposal presents a sequential procedure that uses closed-form expressions to establish the harmonic frequencies at which resonant stages must be added to comply with individual voltage harmonic distortion standards. The method eliminates the need for a trial-and-error process and ensures compliance with THD and individual harmonic distortion limits. The frequencies that require compensation and the gains of the resonant controllers are determined by evaluating the difference that presents the output harmonic impedance of the inverter concerning normalized three-phase harmonic impedance limits defined in this work. Furthermore, this paper adopts the harmonic distortion restrictions imposed by the Standard IEC 61000-2-2, allowing the harmonic impedance limits to be defined for the reference non-linear load indicated in IEC 62040-3. Experimental results are presented to validate the proposed design using a 5 kVA four-leg inverter, feeding balanced, unbalanced, linear, and non-linear loads.Fil: Oggier, Germán Elías. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: Oggier, German Gustavo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: Botterón, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Garcia, Guillermo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentin

Multiple resonant controllers strategy to achieve fault ride-through and high performance output voltage in UPS applications

A control strategy to achieve fault ride-through capability and to provide high performance of the output voltage of a single-phase uninterruptible power supply (UPS) inverter is proposed in this study. This strategy consists in controlling the voltage and current waveforms measured at the inverter output filter, with an inner current control loop and an outer voltage control loop, using a plug-in structure based on multiple resonant stages in addition with proportional controllers. In order to achieve stability from no load to short-circuit conditions, the implementation of the multiple resonant controllers includes a compensation of the system phase lag. Moreover, it presents a comparative analysis between two controller structures, the proposed plug-in and the classical proportional + resonant. From this analysis, it can be concluded that the plug-in structure presents improved characteristics of closed-loop output impedance and output voltage dynamic response during fault ride-through events. A controller design methodology to achieve robustness to parametric uncertainties and UPS standard compliance, is detailed. Experimental results from a single-phase 2 kVA inverter prototype are presented to validate the feasibility of the proposal.Fil: Carballo, Roberto Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Botterón, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Oggier, German Gustavo. Universidad Nacional de Rio Cuarto. Facultad de Ingeniería. Grupo de Electronica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Garcia, Guillermo. Universidad Nacional de Rio Cuarto. Facultad de Ingeniería. Grupo de Electronica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Extending the power transfer capability of a three-port DC-DC converter for hybrid energy storage systems

Design considerations for a three-port bidirectional DC-DC converter to be used in hybrid energy storage systems (HESSs) with the aim to increase the power transfer capability are discussed in this study. For this, an analysis of the power flow that allows obtaining the current waveforms is presented. Then, a loss model, that includes losses in semiconductors and the magnetic core, is proposed based as a function of the voltage variations in the energy storage devices considering all possible cases of power transference. The analysis reveals that it is possible to size the converter auxiliary inductances to reduce the converter currents and losses and therefore increase the power transfer capability. The analysis and the proposal presented in this study are validated using a 5-kW experimental prototype. Results show that it is possible to increase the converter transfer capability up to 80%.Fil: Piris Botalla, Laureano Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas. Universidad Nacional del Comahue. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas; ArgentinaFil: Oggier, German Gustavo. Universidad Nacional de Rio Cuarto. Facultad de Ingeniería. Grupo de Electronica Aplicada; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: García, Guillermo O.. Universidad Nacional de Rio Cuarto. Facultad de Ingeniería. Grupo de Electronica Aplicada; Argentin

Modulation strategy to operate the dual active bridge DC-DC converter under soft-switching in the whole operating range

A new modulation strategy that allows operating the dual active bridge (DAB) dc–dc converter under soft switching in the whole operating range is proposed. This strategy is ruled by imposing a certain modulation index in one of the two bridges and a phase shift between the transformer primary and secondary voltages. Moreover, the proposed algorithm reduces the reactive power and thus reducing the converter conduction losses. An experimental prototype was implemented and some experimental results are presented to validate the theoretical analysis. The experimental results reveal that the overall efficiency of the DAB topology can be improved up to 20% by implementing the proposed modulation strategy instead of the conventional one.Fil: Oggier, German Gustavo. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Investigaciones En Tecnologias Energeticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Investigaciones En Tecnologias Energeticas y Materiales Avanzados.; ArgentinaFil: Garcia, Guillermo. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Investigaciones En Tecnologias Energeticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Investigaciones En Tecnologias Energeticas y Materiales Avanzados.; ArgentinaFil: Oliva, Alejandro Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentin