Modelling and analysis of DFIG wind turbine system in PSCAD/EMTDC

Wind turbine technology is currently driven by offshore
development, which requires more reliable, multi-megawatts
turbines. Models with different levels of detail have been
continuously explored for years. This paper presents a
4.5MW doubly-fed induction generator wind turbine model
established in PSCAD/EMTDC with two control levels, the
wind turbine control and the DFIG control. Two converter
models, a detailed and a simplified model are discussed.
Mathematical representations of the closed-loop control
systems are developed and verified against the
PSCAD/EMTDC model. Simulation studies show good
correspondence between the two results. In addition, the
dynamic response of a 2-mass shaft model to a wind step is
also simulated to examine the effect of torsional oscillations.
This model can be employed to evaluate the control scheme,
mechanical and electrical dynamics and the fault ride-through
capability.