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e undesirable harmonic distortion produced by distributed generation units (DGUs) based on power electronic inverters presents operating and power quality challenges in electric systems. e level of distortion depends on the internal elements of the DGUs as well as on the characteristics of the grid, loads, controls, among others. is paper presents a comprehensive method, focused on power quality indexes and e ciency for the design of micro-grids with multiple DGUs interconnected to the AC grid through three phase multi-Megawatt medium-voltage PWM voltage source inverters (PWM-VSI). e proposed design method is based on a least square solution using the harmonic domain modeling approach to e ectively consider explicitly the harmonic characteristics of the DGUs and their direct and cross-coupling interaction with the grid, loads and the other DGUs. Extensive simulations and analyses against PSCAD are presented in order to show the outstanding performance of the proposed design approach.