Simulation and Comparision of Back To Back System using Bidirectional Isolated DC-DC Converter with Active Energy Storage

This paper proposes simulation and comparison of BTB (back-to-back) system combining bidirectional isolated dc/dc converters and modular multilevel cascade PWM converters [1]. The system consists of multiple converter cells connected in cascade per phase at both front ends. Each converter cell consists of a bidirectional isolated medium-frequency dc/dc converter and two voltagesource H-bridge (single-phase full-bridge) PWM converters. Extremely low voltage steps bring a significant reduction in harmonics and EMI (electromagnetic interference) emissions to the BTB system. The proposed topology utilizes the active ripple energy storage method for rectifier capacitance design [2]. MatLab/Simulation has been done in this paper and proves that the proposed topology works well and the active energy storage method can significantly reduce the DC link capacitor.