| PhD Seminar

Name of the Speaker: Mr. Nitheesh R (EE19D026)
Guide: Prof. Lakshminarasamma
Co-Guide: Dr. Arun Karuppaswamy B
Venue: ESB-244 (Seminar Hall)
Date/Time: 23rd August 2024 (Friday), 2:00 PM
Title: Pole Point Inductor-based Dual Active Bridge Converter with Zero DC Bias Current

Abstract :

The high-gain bi-directional DC-DC converters are used in the grid in conjunction with energy storage systems consisting of batteries, fuel cells, and supercapacitors to support the peak load times. This work proposes a high-gain, single-stage, isolated bidirectional DC-DC converter derived from the base topology of a dual active bridge (DAB) converter called the pole point inductor-based dual active bridge (PPI-DAB) converter. The primary bridge is a current-fed boost full bridge (CF-BFB), and the secondary bridge is a typical full bridge (FB). The gain of the PPI-DAB is twice of a DAB. This topology is compared with the previous version proposed in the literature. The converter dynamics are studied by modeling using the generalized averaged method (GAM). The equivalent circuit model and small-signal model are derived from the GAM. Alongside this, a DC bias current is observed in this converter due to the different currents flowing through the switches, creating an unbalanced volt-second balance equation, which generates a DC bias current in the auxiliary inductor, saturating the high-frequency transformer (HFT). The work presents a current mode control method to rectify this issue. The HFT is protected during transients due to the direct current control method. The control method is simulated on PLECS, and the results are validated by implementation using an experimental setup of a PPI-DAB converter. The experimental results verify the effectiveness of the current control method for the proposed PPI-DAB converter.