Design and Limit of a 4 Legs Inverter with Unbalanced GridInjection Operation Connected to a Quad Active Bridge Converter

Inhalt:
This paper presents the development of a model for the design of a 4 legs inverter taking into account different limiting parameters. The context of this application is a converter which enables the link between a Quad Active Bridge (QAB) and the grid, allowing an unbalanced active and reactive power injection realizing an energy router (ER) function. In this case, the inverter is confronted by several constraints. The design of the DC capacitance and the limitation of the neutral current are taken into account in function of possibilities and constraints imposed by the QAB and the grid. This methodology can be applied to other 4 legs inverter structures.