Assessment of LVRT Requirements and Dynamic Behavior of a Mixed PMSG/DFIG Wind Power Plant

This work assesses the low voltage ride-through requirements and the dynamic behavior of a mixed PMSG/ DFIG wind power plant. Previous works in the literature applied voltage dips seen at the Point of Common Coupling (PCC) of the wind power plant (WPP) directly, which means that the propagation from the transmission grid to the low-voltage level was not considered. This work aims to show the expected operation of a wind power plant when submitted to voltage dips caused by faults at the transmission level, i.e considering the propagation. Equivalent models of a transmission system and a wind power plant were used to generate five types of dips and to access the behavior of the WPP during these events. The results show the expected ranges during the voltage dips for the active power of the generators as well as for overvoltages and overcurrents of the converters.