Author(s) :

Nasiru Bello Kadandani.

Volume/Issue :

Abstract :

Dual active bridge (DAB) converter is a symmetrical converter with identical primary and secondary bridges, capable of providing bidirectional power flow control. It has many advantages, such as electrical isolation, high reliability, ease of realizing soft-switching control and, moreover, having complete symmetry of configuration that allows seamless control for bidirectional power flow, - thus, supporting its candidature for use in the isolation DC-DC conversion stage of solid state transformer (SST). However, the main issue with the cascaded modular DAB converter is the power unbalance across the H-bridges. This occur due to the parameter mismatch, especially the leakage inductance of the transformer, the power may be unequal for each DC-DC converter, and therefore the current stress of them will not be the same. This paper presents a detail analysis, control strategy and simulation of cascaded 3-module DAB converter for use as DC-DC conversion stage of SST with a dedicated power balance controller meant to resolve the parameter variation of the high frequency transformer like leakage inductance and turns ratio. The entire system including the proposed control strategy was simulated in MATLAB® using Simulink® and other power system toolboxes.

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