Effect of transient flux compensation control on fault ride through of doubly fed induction generator wind turbine
DOI:
https://doi.org/10.24084/repqj09.408Abstract
The fault ride through (FRT) of doubly fed induction generator (DFIG) is studied in this paper. Two different FRT strategies are compared. First strategy uses only active crowbar to protect the turbine and the second strategy uses transient flux compensation in addition to the crowbar. Simulations are carried out using Matlab/Simulink. The aim of the study is to reveal how the transient flux compensation improves the operation of DFIG during a fault. If the transient flux is removed the DFIG is controllable during a fault and the reactive power injection to the grid can be maximized. This is an important aspect since the latest grid codes insist that wind turbines should be able to inject reactive power during a fault in order to support the depressed grid voltage. Thus, this paper proposes that after a fault it is reasonable to use the current capacity of rotor side converter to remove the transient flux. This leads to better performance of wind turbine, improved power quality and maximized voltage support.