Full Bridge Isolated DC-DC Converter Research Articles

Analysis and Design Based on the Operation Mode of Power Electronic Transformer in Smart Grid

Power electronic transformers(PET) are the key energy conversion equipment in the operation of modern smart grids, the main function of PET is to achieve the conversion of AC voltage to AC voltage, while taking into account the DC ports. This article mainly studies three-stage power electronic transformers based on three-phase uncontrolled rectifier, full-bridge isolated DC-DC converter and three-phase inverter. The operation mechanism and actual working process of the three parts of the PET are analyzed respectively, and the transformer is simulated and analyzed based on the Matlab/Simulink simulation platform. The rectifier converts the AC voltage on the grid side into a rippled DC voltage; the DC-DC converter transforms the obtained DC voltage, taking into account the access of the DC ports; the inverter converts the obtained DC voltage into AC voltage through unipolar modulation and connects to the grid. The experimental results show that the PET constructed in this way can operate safely and stably, which has good voltage conversion and electrical isolation functions, and can be connected to DC loads.

A New Four Port Full Bridge Isolated DC-DC Converter with PMSG Wind and PV Based Power Generation for DC Microgrid

This paper presents a new four port full bridge isolated dc-dc converter combining photovoltaic power generation, permanent magnet synchronous generator based wind energy system and energy storage device like battery. The converter is designed in order to show high performance compared to conventional multiport converters. A power factor correction cuk converter is used for voltage boosting and power quality enhancement of wind side converter. Sepic based converter is applied for photovoltaic generation side and a isolation transformer unit is added at output to decrease THD of the converter by operating it at nominal frequency. A full bridge dc to ac converter is used before isolation transformer and a full bridge rectifier is added at the output for DC microgrid applications. The proposed four port full bridge isolated dc-dc converter combining PV, PMSG wind and battery is simulated in MATLAB/SIMULINK software to verify the performance of the converter.

Design, Simulation and Implementation of Current Fed Isolated Full Bridge DC-DC with Voltage Multiplier for Fuel Cell Grid Applications

Abstract This paper proposes novel current fed converter full bridge isolated DC-DC converter with voltage multiplier and active clamp circuit for fuel cell grid connected applications. The proposed converter is best suited for fuel cells and their interfacing to utility three phase grid. Active clamp concept introduced on the primary side of isolation transformer to reduce the turn-off voltage spikes of full bridge active devices. Innate soft-switching with elongated range can be achieved in the recommended converter by using the parasitic capacitance of MOSFET switches and leakage inductance of the high frequency transformer. Zero Voltage Switching(ZVS) is achieved for all the primary devices which allow greater switching frequency operation and improvement in over-all efficiency of the converter for utility interface. Cost, size and weight of the converter minimizes for the higher switching operation of the converter. Half-wave Cockcroft-Walton Voltage Multiplier (H-W C-W VM) having minimum number of multiplying stages is used on the secondary side of the designed converter in order toget the required DC-link voltage for three phase utility grid connection. The converter's switching frequency is maintained at 100 KHz. This paper is organized as introduction, steady state operation, simulation results with two different cases i.e. full load and half load conditions and finally, test result validation of a 250 Watt experimental setup with the proposed converter.

Surge Analysis and Snubber Design for a Full-Bridge Isolated DC-DC Converter in HVDC Power Distribution Systems

Surge Analysis and Snubber Design for a Full-Bridge Isolated DC-DC Converter in HVDC Power Distribution Systems