In order to realize improvements in the performance of the renewable energy source grid-connected generation system in terms of the generation range

operation efficiency and grid current quality

we propose a modified diode-clamped inverter with the flexible topology ability. The actual topology will change with the variation of the power and voltage of the generator to widen the generation range and increase the operation efficiency. Furthermore

the current prediction control is introduced into the proposed inverter to realize the closed-loop control of the grid current with high performance. Detailed experimental results verify the correctness and feasibility of the proposed inverter and the control strategy.