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In wind power generation system the grid-connected inverter is essential device for energy conversion and transmission, of which the performance has a direct influence on the entire wind power generation system. The inductance of AC side affects the static and dynamic performance of the whole system when the grid-connected inverter is actively inverting. So the design of inductance of AC side is essential. The paper presents a new design method of the inductance of AC side based on steady-state power and transient current tracking, the designed inductance can meet demands of the wind power generation system. Simulation and experimental results verify the feasibility of the proposed designed method.