This dissertation designs three different fault ride through (FRT) approaches to improve the performance of DFIG based WT during voltage sag conditions. First, an integral terminal sliding mode controller (ITSMC) was implemented for the rotor-side converter (RSC) and grid-side converter (GSC), and a fuzzy logic and a Posicast approach are also proposed to control the series grid side converter (SGSC). In the second approach, a fuzzy second order integral terminal sliding mode (FSOITSMC) approach for both RSC and GSC, along with a FSOITSMC-based Posicast controller for the SGSC, which is placed in series with the DFIG, have been applied to enhance the DFIG’s performance. Lastly, a fault ride through design has been applied for hybrid PV-Wind power generation systems. In the proposed configuration, the PV system was connected to the DC-link of the DFIG through a DC-DC converter. During voltage sag conditions, an SGSPI protection system is activated while the GSC acted as a STATCOM, thus injecting reactive power to the grid. The effectiveness of the proposed fault tolerant configuration approaches in riding through different types of grid faults is evaluated via detailed computer experiments. The merits of the proposed approach are further compared to those of the standard state of the art in voltage sag mitigation. Results clearly show that the proposed control paradigm is able to protect the converters from damages and ensure continuous connection of the WT to the grid during faults, hence maintaining power quality.
|Commitee:||Bayoumi, Magdy, Farmer-Kaiser, Mary, Fekih, Afef, Madani, Mohammad, Pan, Zhongqi, Sun, Xiaoduan|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||DAI-B 80/08(E), Dissertation Abstracts International|
|Subjects:||Engineering, Electrical engineering|
|Keywords:||DFIG, Integral terminal sliding mode control, PV, Series grid side converter, Voltage sag mitigation|
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