Practice articleImproved fault ride through capability of DFIG based wind turbines using synchronous reference frame control based dynamic voltage restorer

- Analyzes the performance of DVR with SRF control for improving the FRT capability in DFIG.
- Verifies the FRT capability of a DFIG based wind turbine using DVR according to grid codes.
- Verifies controller operation in maintaining active and reactive power during fault.
- Compares harmonic compensation of the DVR control used with conventional Feed-forward control.

Fault ride through (FRT) capability in wind turbines to maintain the grid stability during faults has become mandatory with the increasing grid penetration of wind energy. Doubly fed induction generator based wind turbine (DFIG-WT) is the most popularly utilized type of generator but highly susceptible to the voltage disturbances in grid. Dynamic voltage restorer (DVR) based external FRT capability improvement is considered. Since DVR is capable of providing fast voltage sag mitigation during faults and can maintain the nominal operating conditions for DFIG-WT. The effectiveness of the DVR using Synchronous reference frame (SRF) control is investigated for FRT capability in DFIG-WT during both balanced and unbalanced fault conditions. The operation of DVR is confirmed using time-domain simulation in MATLAB/Simulink using 1.5 MW DFIG-WT.