Recent advancement of power electronics devices in grid-connected systems increased the power quality and stability issues. New grid code requires the grid-connected system to be connected with the grid during fault and voltage disturbance. It is challenging to keep the system online during and maintain the actual grid standards under-voltage dip, which is a common practice in the Indian scenario. In this paper, grid connected wind power generation system drives a permanent magnet synchronous generator (PMSG). For the power generation from PMSG to a grid Three-level, neutral point clamped (TLNPC) which is connected back to back is required for the interfacing the system. The proposed model deals with unbalance capacitor voltage and dynamics of TLNPC converter. The proposed technique enhances the performance of the system under input voltage sag. MATLAB/SIMULINK numerical simulation software adapted for modeling of the complete model of the system. Numerical results and typical experimental results are presented, shown good agreement with the expectation of the wind power system.