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Grid code specifications for voltage ride-through (VRT) of power generating units are based on time-domain envelopes of permissible terminal voltage magnitudes. Since an infinite number of voltage trajectories can be inscribed within a given enclosure, verifying that a given apparatus will withstand any such disturbance can be a daunting task. This paper tackles the VRT verification problem for doubly...
Depending on the rotor magnet and stator winding configurations, the magnitude of the resulting flux-linkage harmonics in permanent-magnet (PM) motor drives can be substantial. The flux-linkage harmonics result into dc-link current harmonics that can cause the operation of certain track circuits (used to identify the presence of a train on a track section) to malfunction. Predicting the impact of...
Small signal stability analysis is conducted considering grid connected doubly-fed induction generator (DFIG) type. The modeling of a grid connected DFIG system is first set up and the whole model is formulated by a set of differential algebraic equations (DAE). Then, the mathematical model of rotor-side converter is built with decoupled P-Q control techniques to implement stator active and reactive...
In this paper, small signal stability analysis considering grid-connected wind farms of doubly-fed induction generator (DFIG) type is conducted. A simplified and practical DFIG model is presented firstly, and the stator flux-oriented vector control based method is employed to implement stator active and reactive powers control in modelling rotor-side converter. The power system small signal stability...
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