Influence of drive train modelling simplification on stability and CCT of a DFIG-integrated power system

In this paper, the effect of drive train modelling simplification on the stability as well as the critical clearing time (CCT) of the doubly fed induction generator (DFIG)-integrated power system is examined. Eigenvalue analysis and time-domain-based simulations are utilised to study the influence of drive train models on stability and CCT. Two different operating conditions, i.e., UPF and non-UPF modes of grid side convereter (GSC) of DFIG are considered for analysis. It is observed that too much simplified drive train model results in over-optimistic stability predictions. Further, an over-simplified drive train model is found to withstand the longer fault duration. The factors contributing to the over-optimistic results are also discussed.