This paper is aimed at researching a modular inverter for the grid-tied micro-turbine power generation system. By coupling with the developed method, the operational reliability and loss factor are first evaluated, where the results can output to help further decide the amount of the duty inverter modules. Then, a current-sharing scheme as well as a modular arrangement is developed to expand the inverter circuit being capable of the parallel operation of multi- modular in anticipation of increasing the reliability and efficiency requirements of installed. The method proposed in this paper was examined under various scenarios. The results help consolidate the feasibility and practicability of the approach for the applications considered.