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


Grid-connected power conversion systems for renewable energy sources must fulfill many requirements, e.g., the high efficiency, the reduced price and complexity, and, very often, the boost capabilities that's typically achieved employing a front-end dc-dc boost converter before the inversion stage, resulting in a 2-stage design. Meanwhile, single-stage power conversion systems, which perform the boosting operation among the inversion one, provide some potential benefits, in terms of reducing the complexity and the degree of the entire system. Among many proposed options, the split-source inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative option with some attention-grabbing features to the commonly used Z-source inverter. Taking into consideration 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 theme in grid-connected mode, that has never been studied however. Hence, this paper models the SSI dc side and proposes a modified modulation theme combined with the commonly used synchronous reference frame management technique to realize a decoupled control theme of the SSI in grid-connected mode, i.e., the dc and the ac sides of the SSI will be controlled independently, that is convenient for many applications. The introduced control theme is analyzed and simulated employing 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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