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The primary emphasis of this inquiry is on the influence of voltage-source converter harmonics on the power quality of a power system. The level of harmonic distortion produced by several VSCs may significantly vary in the presence of uncertainties, making it challenging to predict its behavior due to these fluctuations. These uncertainties may arise due to the selection of design parameters or the adjustment of system characteristics. Therefore, it is essential to use statistical techniques to quantify the levels of VSC harmonic distortion in the presence of uncertainty. The experimental assessment of the UDR's performance was conducted using a practical microgrid lab that included three VSCs. The MCS approach functioned as a benchmark for evaluating the precision of the anticipated UDR results. The UDR consistently achieved the expected results, saving a large amount of time compared to the MCS technique. Furthermore, the UDR findings closely aligned with the MCS strategy.