In this research, a practical solution is proposed to enhance the performance of the single-phase DC/AC converter, which is usually used as an interface between the renewable energy source and the power grid in residential applications. In order to meet the strict requirements of the grid code, various solutions have been applied. In detail, the multilevel T-type topology is employed to further reduce the distortion of the output current. In control design, adaptive sliding mode control designed in discrete-time domain is adopted to enhance the robustness of the inner current control-loop against parameter variations. For the dc bus voltage control loop, multiple objectives such as negligible overshoot and limited inrush current during the startup process, and reduced voltage oscillation with the sudden change of the transferred power, can be fulfilled by using state-machine programming and Fuzzy-PI controller. The effectiveness of the proposed solution is verified by numerical simulations where all control algorithms are implemented in C-language. This technique guarantees consistency between simulations and practical implementations based on digital platforms.
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