Abstract
The three-level converters with series connected capacitors need to address the dc voltage control and balancing under any conditions, whether in operational or standby. The effect of inrush transients in dc bus results in degradation of components lifetime, resulting in premature failures. To address these issues, we present a new power conversion architecture to economically simplify the subsystems, with the following integrated functionalities: auxiliary dc power supply, lossless dc split-bus balancing and inrush current elimination. These integrated functions are achieved by controlling a bi-directional dc-dc three-level converter topology. The three-level buck-boost (3L-BB) interface converter provides the capability to supply power to various auxiliary loads for the main three-phase three- level converter, while performing dc voltage regulation and balancing. The system initialization feature that precharges the dc split-bus capacitors through 3L-BB eliminates the inrush current, allowing the use of components with longer lifetime at lower cost. The proposed system architecture was evaluated within a 100kW three-phase three-level grid- connected photovoltaic (PV) inverter. The evaluation results demonstrate the architecture’s performance for power supply capability with voltage regulation, lossless dc splitbus balancing and inrush current elimination.
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