Decoupled control of active and reactive power in a DFIG based wind energy conversion system with conventional P-I controllers

Variable speed wind energy system uses mostly doubly-fed induction generators(DFIGs) for its application which gives better performance, maximum power output etc. Various control scheme is used for both machine-side converter control and grid-side converter control. In this paper stator-flux oriented vector control scheme is used in machine-side converter by which decouple control of active and reactive of DFIG is achieved. Grid voltage oriented vector control is used in grid-side, which maintains the dc-link voltage and improves the power factor at rotror-side. Dynamic modelling of DFIG is described first in this paper. Vector control scheme for both grid-side and machine-side using P-I controller is modeled in Matlab and the results are analysed.