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Robustness evaluation of grid-tied AC-stacked PV inverter system considering manufacturing inaccuracies

This paper evaluates the impact of manufacturing inaccuracies and aging on robust operation of distributed AC-stacked PV inverters. A novel index for analyzing the robustness of grid-tied AC-stacked PV inverter architectures has been used in this paper. Utilized index by considering four major operational characteristics such as conversion efficiency, Total Harmonic Distortion (THD), Maximum Power Point Tracking (MPPT) effectiveness and Power Factor (PF) compliance provides a comparative evaluation of PV inverters in different conditions and applications. Statistical analysis and Latin Hypercube Sampling (LHS) algorithm are used to model the impact uncertainties on robust operation of individual and AC-stacked PV inverters with minimum sampling point. Uncertainties which are considered in this paper are physical variations of passive components due to manufacturing inaccuracies and aging and also sensing inaccuracies. Boundary of robustness of grid-tied AC-stacked PV inverter architecture for each uncertainty is determined and compared with single inverter to verify the feasibility of the operation of grid-tied AC-stacked PV inverter architecture. Simulation and experimental results verifies the feasibility of the robust operation of Ac-stacked PV inverters.