Universal Interlinking Converter for Prosumer DC Buildings: Operation with Different DC Grid Types

With the growing adoption of dc microgrids across various applications, the demand for flexible and adaptable power electronics solutions is becoming increasingly important. To address this gap in the literature, this paper presents a universal ac-dc power converter capable of integrating the ac power distribution with both unipolar (350 Vdc) and bipolar (± 350 Vdc) dc microgrids. Usually, such a converter is referred as a dc grid-forming or interlinking converter and is generally composed of two stages: an ac-dc rectifier and an isolated dc-dc. In this paper, a modification to the dc-dc stage is proposed to ensure full compatibility with different types of dc grids. The proposed converter is designed to operate with both single-phase and three-phase ac inputs, ensuring broad applicability with a single hardware solution. Additionally, a 5-kW prototype was used and experimental results were provided to validate the proposed approach.