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In this paper, an inverter array structure for the distributed generation is proposed. In the method, the inverter array is organized by basic and extended units, in which basic units are grouped to evenly share the capacity of primary energy source while extended units are designated for online redundant services. Through this design, it is not only beneficial to improve the reliability of energy production but also owns high flexibility of capability extension. To validate the effectiveness of this method, both simulations and hardware realizations have been made and evaluated. Test results help support the proposed approach for grid-connected operations.