Ridethrough of Wind Turbines with Doubly-Fed Induction Generator During a Voltage Dip

Abstract

Abstract-In this paper, a solution is described that makes it possible for wind turbines using doubly-fed induction generators to stay connected to the grid during grid faults. The key of the solution is to limit the high current in the rotor in order to protect the converter and to provide a bypass for this current via a set of resistors that are connected to the rotor windings. With these resistors, it is possible to ride through grid faults without disconnecting the turbine from the grid. Because the generator and converter stay connected, the synchronism of operation remains established during and after the fault and normal operation can be continued immediately after the fault has been cleared. An additional feature is that reactive power can be supplied to the grid during long dips in order to facilitate voltage restoration. A control strategy has been developed that takes care of the transition back to normal operation. Without special control action, large transients would occur.

Small-signal stability of wind power system with full-load converter interfaced wind turbines

“…the ability of the WTs to stay connected during external disturbances in the grid and provide necessary voltage support [7]- [9]. With increasing penetration of wind power and increasing size of each installed WPP new stability considerations arise.…”

Analysis of the Impact of the Crowbar Protection on Short-Circuit Level and Quality Index

“…In order to reach the objective of this paper, the DFIG was the wind generators technology chosen. Since dynamic models of this generator type have been widely developed in the literature [11], [18]- [20], generator modelling will not be carried out in this work.…”

“…For that, it was necessary to limit the rotor current including a bypass resistor (crowbar protection) connected between the rotor and the converter [11].…”

Control of Battery Energy Storage System for Wind Turbine based on DFIG during Symmetrical Grid Fault

“…Much research has been done to keep the DFIG wind turbine connected to the grid and to protect converters in case of symmetrical faults of the electrical grid. In [7] a method for uninterrupted operation of the DFIG during faults has been proposed. In this structure the rotor side converter is blocked and the rotor winding of DFIG were short-circuited via a crow-bar, the DFIG becomes as conventional induction generator, it absorbs reactive power network and injects active power to the electrical grid.…”