Power sharing controller for modular dual active bridge DC/DC converter in medium voltage DC applications

Abstract

This paper presents a new structure of a power sharing controller for a modular based dual active bridge (DAB) DC/DC converter. The modular topology is based on input-series output-parallel (ISOP) connection of DAB modules suitable for a voltage step down application at medium voltage level. Since DAB has bi-directional power flow capability, this connection would act as its dual input-parallel output-series (IPOS) counterpart in the case of reverse power flow. The proposed power sharing controller ensures uniform power sharing among the modules even in the case of parameter mismatches as well as manages converter operation during pole-to-pole and individual module DC faults. Results for the proposed controller are justified using a detailed Matlab simulation model.

Disturbance Rejection and Control Design of MVDC Converter with Evaluation of Power Loss and Efficiency Comparison of SiC and Si Based Power Devices

“…The DC-DC converter, which acts as the DC transformer, is one of the major key components in modern DC power grids and is connected to DC lines with variable voltage levels to make a DC network [21,22]. The MVDC DC-DC converter has drawn much attention in recent years; however, there are a number of major issues including protection and fault isolation, DC voltage regulation, output voltage control, voltage dip control, maintaining reliability and interconnecting different power lines [22][23][24][25][26]. All these DC-DC converters would have regulation capabilities, which provides balanced and stable voltage for back-end converters, improving system reliability and over-current control ability.…”