Decoupled Control Scheme of Grid-Connected Split-Source Inverters - 2017

PROJECT TITLE :

Decoupled Control Scheme of Grid-Connected Split-Source Inverters - 2017

ABSTRACT:

Grid-connected power conversion systems for renewable energy sources must fulfill many needs, e.g., the high efficiency, the reduced cost and complexity, and, quite often, the boost capabilities that is sometimes achieved using a front-end dc-dc boost converter before the inversion stage, resulting in a 2-stage architecture. Meanwhile, single-stage power conversion systems, that perform the boosting operation inside the inversion one, offer some potential blessings, in terms of reducing the complexity and the quantity of the whole system. Among several proposed choices, the split-source inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative possibility with some attention-grabbing options to the commonly used Z-source inverter. Taking into account that the SSI is controlled by a single parameter, i.e., its dc and ac sides are controlled by the modulation index, it is of paramount importance to investigate its management scheme in grid-connected mode, which has never been studied however. Hence, this paper models the SSI dc side and proposes a changed modulation scheme combined with the commonly used synchronous reference frame management technique to achieve a decoupled control theme of the SSI in grid-connected mode, i.e., the dc and the ac sides of the SSI can be controlled independently, that is convenient for many applications. The introduced control scheme is analyzed and simulated using a MATLAB/Simulink model, where a reduced scale one-kVA grid-connected SSI is meant and simulated for the sake of experimental validation. Finally, the designed system is implemented experimentally to validate and verify the reported analysis and simulations.

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