Unidirectional Three Phase Dual Active Bridge DC-DC Converter Used in Electrical Vehicles

This work focuses on the unidirectional high frequency three phase dual active bridge dc-dc converter. This type of converters is used in sustainable energy generation and it is suitable for the electrical vehicle application. The three-phase dual active bridge dc-dc converter consists of two power conversion stages (an inverter and a rectifier) separated by three single phase high frequency planar transformers in order to provide a galvanic isolation between the input and the output. A phase shift control strategy is applied between the signal gates of the switches of the two active bridges in aims to control the transferred active power from the input port to the output. Thanks to the three-phase structure and the high frequency operation, this system is characterized by low input current ripples and it has the advantage of its reduced size. Moreover, this converter provides a high voltage gain and a wide input voltage range with an important efficiency. In this paper, the modeling and the control of the dual active bridge dc-dc converter will be clearly explained and simulations results under MATLAB/SIMULINK will be shown to validate the operation of the converter topology. Finally, detailed analysis will be carried out.