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Analysis of voltage ride through improvement using weibull parameters for symmetrical and asymmetrical fault
M.B. Hemanth Kumar,
Published in Amazedia Solutions
Volume: 9
Issue: 3
Pages: 5411 - 5425
In this paper, a modified dynamic capacitor type fault current limiter configuration is modeled and analyzed for low voltage ride through (LVRT) improvement for a doubly fed induction generator (DFIG). The DFIG is fed with a constant wind speed estimated from Weibull parameters. The proposed crowbar, consisting of a parallel resonance circuit, connected with the capacitor and in shunt with rotor side converter (RSC). There are several crowbar configurations proposed in the literature, and every method is having its own advantages and drawbacks. The rotor side converter is connected to a dc-link capacitor followed by Grid side converter (GSC). The modified crowbar arrangement protects the DFIG, and it further avoids the damage of RSC including capacitor under a grid fault condition. When the crowbar resistance is alone implemented, it will isolate RSC which leads to generator excitation failure. At this instant, the generator works as Squirrel cage-induction generator (SCIG) and thereby absorbs magnetizing current from the grid through stator windings. This creates voltage sag at the point of common coupling (PCC) and it needs to be rectified by modifying the existing crowbar configuration by connecting a capacitor in parallel with the parallel resonance branch. This arrangement is further connected to a crowbar resistance, which will maintain the rotor windings connected with RSC and thus overcoming the LVRT. The proposed model has been performed in MATLAB/Simulink and the DFIG performance has been improved under transient conditions. © 2020, International Journal of Scientific and Technology Research. All rights reserved.
About the journal
JournalInternational Journal of Scientific and Technology Research
PublisherAmazedia Solutions