A Digital Predictive Current-Mode Controller for a Single-Phase High-Frequency Transformer-Isolated Dual-Active Bridge DC-to-DC Converter

2016 ◽  
Vol 63 (9) ◽  
pp. 5943-5952 ◽  
Author(s):  
Sumit Dutta ◽  
Samir Hazra ◽  
Subhashish Bhattacharya
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Current Mode ◽  
Dual Active Bridge ◽  
High Frequency Transformer

scholarly journals Analytical description of power losses in a transformer operating in the dual active bridge converter

2016 ◽  
Vol 64 (3) ◽  
pp. 561-574
Author(s):  
R. Barlik ◽  
M. Nowak ◽  
P. Grzejszczak ◽  
M. Zdanowski
Keyword(s):  
Distributed Generation ◽  
High Frequency ◽  
Energy Flow ◽  
Single Phase ◽  
Renewable Energy Sources ◽  
Analytical Description ◽  
Power Losses ◽  
Dual Active Bridge ◽  
High Frequency Transformer

Abstract The paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz’s and Dowell’s equations. The analytical results have been verified experimentally.

scholarly journals A single-phase DC-AC dual-active-bridge based resonant converter for grid-connected photovoltaic applications

2021 ◽  
Author(s):  
Marcos Felix Aguirre
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Current Control ◽  
Energy Resources ◽  
Voltage Source ◽  
Resonant Circuit ◽  
Renewable Energy Resources ◽  
Grid Voltage ◽  
Dual Active Bridge ◽  
Averaged Models

In the wake of the global energy crisis, the integration of renewable energy resources, energy storage devices, and electric vehicles into the electric grid has been of great interest towards replacing conventional, fossil-fuel-dependent energy resources. This thesis presents the circuit topology and a control strategy for a 250-W single-phase gridconnected dc-ac converter for photovoltaic (PV) solar applications. The converter is based on the dual active bridge (DAB) kernel employing a series-resonant link and a high-frequency isolation stage. For interfacing the 60-Hz ac grid with the 78-kHz resonant circuit, the converter utilizes a four-quadrant switch array that functions as an ac-ac stage. Therefore, a bipolar low-frequency voltage source, that is the grid voltage, is used to synthesize a symmetrical high-frequency voltage pulse-train for the resonant circuit. Thus, soft switching and the use of a compact ferrite-core transformer have been possible. Then, a fast current-control loop ensures that the converter injects a sinusoidal current in phase with the grid voltage, while a relatively slower feedback loop regulates the converter dc-side voltage, that is, the PV array voltage, at a desired value. To simulate the converter and to design the controllers, the thesis also presents nonlinear large-signal and linearized small-signal state-space averaged models. The performance of the converter is assessed through simulation studies conducted using the aforementioned averaged models, a detailed topological model in the PLECS software environment, and a prototype. Keywords: Photovoltaic, PV, Microinverter, Dual Active Bridge, Phase-shift Modulation, High Frequency Transformer

scholarly journals Family of single‐phase isolated high‐frequency transformer integrated improved magnetically coupled Z‐source ac–ac converters

2020 ◽  
Vol 13 (9) ◽  
pp. 1901-1910
Author(s):  
Hafiz Furqan Ahmed ◽  
Mohamed Shawky El Moursi ◽  
Tooba Irshad ◽  
Ehab El‐Saadany ◽  
Khalifa Al Hosani
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
High Frequency Transformer ◽  
Ac Converters

scholarly journals Modified Structure of Sepic Based Single-Phase Five-Level T-Type Inverter for Photovoltaic Applications

2019 ◽  
Vol 9 (1) ◽  
pp. 3852-3856 ◽  
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Prototype Model ◽  
Matlab Simulation ◽  
Voltage Level ◽  
High Frequency Transformer ◽  
Photovoltaic Applications ◽  
Quality Of Supply

In this paper, a modified structure of two-stage sepic based five-level T-type inverter is presented for photovoltaic applications. The proposed topology consists of a frond-end sepic converter cascaded with full bridge T-type inverter through a high-frequency transformer. The proposed topology owns the merits of high boost output voltage level, modularity, reduced device parts, and better quality of supply. Therefore, a detailed operation of the proposed topology and the level generations using sine pulse width modulation are presented. Finally, the performance of the proposed topology is validated through Matlab simulation and experimental prototype model results

scholarly journals A single-phase DC-AC dual-active-bridge based resonant converter for grid-connected photovoltaic applications

2021 ◽  
Author(s):  
Marcos Felix Aguirre
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Current Control ◽  
Energy Resources ◽  
Voltage Source ◽  
Resonant Circuit ◽  
Renewable Energy Resources ◽  
Grid Voltage ◽  
Dual Active Bridge ◽  
Averaged Models

In the wake of the global energy crisis, the integration of renewable energy resources, energy storage devices, and electric vehicles into the electric grid has been of great interest towards replacing conventional, fossil-fuel-dependent energy resources. This thesis presents the circuit topology and a control strategy for a 250-W single-phase gridconnected dc-ac converter for photovoltaic (PV) solar applications. The converter is based on the dual active bridge (DAB) kernel employing a series-resonant link and a high-frequency isolation stage. For interfacing the 60-Hz ac grid with the 78-kHz resonant circuit, the converter utilizes a four-quadrant switch array that functions as an ac-ac stage. Therefore, a bipolar low-frequency voltage source, that is the grid voltage, is used to synthesize a symmetrical high-frequency voltage pulse-train for the resonant circuit. Thus, soft switching and the use of a compact ferrite-core transformer have been possible. Then, a fast current-control loop ensures that the converter injects a sinusoidal current in phase with the grid voltage, while a relatively slower feedback loop regulates the converter dc-side voltage, that is, the PV array voltage, at a desired value. To simulate the converter and to design the controllers, the thesis also presents nonlinear large-signal and linearized small-signal state-space averaged models. The performance of the converter is assessed through simulation studies conducted using the aforementioned averaged models, a detailed topological model in the PLECS software environment, and a prototype. Keywords: Photovoltaic, PV, Microinverter, Dual Active Bridge, Phase-shift Modulation, High Frequency Transformer

Single-Phase AC-DC-AC Multilevel Five-leg Converter Based on a High-Frequency Transformer

2021 ◽  
Author(s):  
Jean T. Cardoso ◽  
Cursino B. Jacobina ◽  
Phelipe L. S. Rodrigues ◽  
Antonio M. N. Lima
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
High Frequency Transformer
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