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A novel ISOP current-fed modular dual-active-bridge (CF-MDAB) DC-DC converter with DC fault ride-through capability for MVDC application

This paper proposes a novel input-series output-parallel (ISOP) current-fed modular dual-active-bridge (CF-MDAB) dc-dc converter for medium-voltage dc (MVDC) system application. The proposed converter exhibits favorite features of DAB converter such as galvanic isolation, soft-switching condition and small passive components. Compared to ISOP DAB converter, the proposed topology has direct dc current controllability, thus can achieve dc circuit breaking and fault ride-through operation. The operating principle is described, and the corresponding control system is developed to realize the power flow and balancing control. A case study of 500 kW, 20 kHz ISOP CF-MDAB is simulated for validation and downscaled experimental results will be given in full paper.