INVESTIGATION OF POSSIBLE DYNAMIC INTERACTION OF DFIGS OF DIFFERENT CAPACITY EXISTING IN THE SAME WIND FARM He, Fan This paper explores the possibility of dynamic interaction between DFIGs of different capacity in a grid connected and islanding mode wind farm. The modeling of DFIG is presented in the paper. The case of adding 5 MW DFIGs to a wind farm with existing 1.5 MW DFIGs is considered. Grid-connected scenario is considered regarding the connection of the units. Moreover, step-up wind speed, noisy wind speed and fault at infinite bus will be introduced as disturbances to examine the possible dynamic interaction. Simulation using MATLAB and Simulink has been used to investigate all cases. To further justify the simulation results, a series of modal small perturbation analysis is also conducted. M.S. in Electrical Engineering, December 2011 Shanechi, Hassan 2011-12 2011-12 Thesis application/pdf islandora:6990 http://hdl.handle.net/10560/2591 ECE / Electrical and Computer Engineering Illinois Institute of Technology en In Copyright http://rightsstatements.org/page/InC/1.0/ Restricted Access