DC Side Current Balancing of Two Parallel Connected Interleaved Three-Phase Three-Switch Buck-Type Unity Power Factor PWM Rectifier Systems

摘要

In this paper the active DC side current balancing of parallel connected three-phase buck-type rectifier systems is investigated using space vector calculus. Modulation schemes for the parallel connection are derived from the switching state sequences known for a single system and are comparatively evaluated by digital simulation. The independent current AC and DC side current paths are shown and two control schemes are presented which allow to balance the DC side currents of the individual systems. All theoretical considerations are verified by digital simulations.