Control Concept for Parallel Interleaved Three-Phase Converters with Decoupled Balancing Control

The parallel operation of multiple switches, modules or complete converters allows the realization of power electronic systems with high output currents. However, an equal distribution of the total current between the parallel modules has to be ensured to avoid excessive losses and the saturation of individual inductors. In this paper, a novel current balancing control approach is presented that is decoupled from the output voltage and current controllers and combines the benefits of an intuitive operation principle, simple controller design and low implementation effort. The analysis, discussion as well as the simulative verification of the concept are exemplarily performed for a three-phase four-wire grid connected 10 kVA converter for smart grid applications.