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This work proposes a three-port converter structure for high-voltage dc (HVDC) applications to facilitate power flow routing between a controlled dc bus and two independent dc networks. Control of line power flows is achieved via the series injection of incremental dc voltages between the networks, thus the converter structure is only rated for a fraction of the rated power and voltage of the connecting dc networks. Unlike previously proposed dc power flow devices, a significant advantage of the presented structure is that the incremental dc voltages are generated without requiring power exchange with an external ac network. As a result, the proposed converter structure offers a highly cost-effective means of routing and controlling dc power flows within emerging HVDC grids.

Abstract-This paper proposes a hybrid electronic and magnetic structure that enables transformers with "fractional" and reconfigurable turns ratios (e.g. 12:0.5, 12:1, 12:2). This functionality is valuable in converters with wide operating voltage ranges and high step-up/down, as it offers a means to reduce copper loss within the transformer while also facilitating voltage doubling and quadrupling. We introduce the principle of operation of the structure and present models for its magnetic and electrical behaviour. An experimental prototype capable of accommodating a widely varying input (120-380 V dc ) and output (5, 9, 12V) validates the operating principle and modelling of the proposed structure and achieves conversion efficiencies between 93.4% and 95.7% at 25-36 W.

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