A Proposed Controllable Crowbar for a Brushless Doubly-Fed Reluctance Generator, a Grid-Integrated Wind Turbine

Mahmoud Rihan, Mahmoud Nasrallah, Barkat Hasanin and Adel El-Shahat
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Mahmoud Rihan: Electrical Engineering Department, Faculty of Engineering, South Valley University, Qena 83521, Egypt
Mahmoud Nasrallah: Electrical Engineering Department, Faculty of Engineering, South Valley University, Qena 83521, Egypt
Barkat Hasanin: Electrical Engineering Department, Qena Faculty of Engineering, Al-Azhar University, Qena 83513, Egypt
Adel El-Shahat: Energy Technology Program, School of Engineering, Purdue University, West Lafayette, IN 47906, USA

Energies, 2022, vol. 15, issue 11, 1-29

Abstract: Brushless doubly fed reluctance generators (BDFRGs) are hopeful generators for using inside variable speed wind turbines (VSWTs), as these generators introduce a promising economical value because of their lower manufacturing and maintenance costs besides their higher reliability. For integrating WT generators, global networks codes require enabling these generators to stay connected under grid disturbances. The behavior of the BDFRG is strongly affected by grid disturbances, due to the small rating of the used partial power converters, as these converters cannot withstand high faults currents which leads to quick tripping of BDFRG. VSWTs can be safeguarded against faults using the crowbar. Usually, the conventual crowbar is shunt connected across the converter to protect it, but this configuration leads to absorbing reactive power with huge amounts from the grid, leading for more voltage decaying and more power system stability deterioration. This study proposes a simpler self-controllable crowbar to enhance the ability of the BDFRG to remain in service under faults. The operation technique of the proposed crowbar is compared to other crowbar operation techniques, the effectiveness of the proposed system would be analyzed. Through the simulation results and behavior analysis, the proposed crowbar technique demonstrates a decent improvement in the conduct of the studied system under faults.

Keywords: brushless doubly fed reluctance generator (BDFRG); crowbar; symmetrical fault; unsymmetrical fault; wind turbine (WT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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