PROJECT TITLE :

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

ABSTRACT:

Grid-connected power conversion systems for renewable energy sources should fulfill many necessities, e.g., the high potency, the reduced cost and complexity, and, quite often, the boost capabilities that is usually achieved employing a front-finish dc-dc boost converter before the inversion stage, leading to a 2-stage design. Meanwhile, single-stage power conversion systems, which perform the boosting operation inside the inversion one, offer some potential advantages, in terms of reducing the complexity and the amount of the whole system. Among many proposed choices, the split-supply inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative choice with some interesting features to the commonly used Z-source inverter. Taking into consideration that the SSI is controlled by one parameter, i.e., its dc and ac sides are controlled by the modulation index, it is of paramount importance to research its control theme in grid-connected mode, which has never been studied however. Hence, this paper models the SSI dc aspect and proposes a modified modulation scheme combined with the commonly used synchronous reference frame control technique to attain a decoupled management scheme 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 several applications. The introduced control theme is analyzed and simulated using a MATLAB/Simulink model, where a reduced scale 1-kVA grid-connected SSI is intended 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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