Modeling and small signal analysis of a PMSG-based wind generator With sensorless maximum power extraction

In this paper, a grid-tied permanent magnet synchronous generator (PMSG) based wind generator with sen-sorless maximum power point tracking (MPPT) is modeled in Matlab/Simulink. Small signal analysis is performed to testify that sensorless MPPT can help the system achieve stability. Time domain simulations are performed to present the wind energy system´s MPPT capability for a typical wind speed time series input and the system´s ability to recover its equilibrium operating point. The major finding of this paper includes two aspects: i) the sensorless MPPT is effective in extracting maximum wind energy and at the same time stabilizing the wind energy system and 2) the slope of the MPPT lookup table has the major impact on the electromechanical dynamics of the wind energy system.