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Short circuit current analysis for DFIG-based wind generation system with Crowbar protection under grid faults

Geng Hua

Open publisher page 3 citations

Abstract

The complete response of DFIG(Doubly-Fed Induction Generator) stator and rotor fluxes to the firing of Crowbar is analyzed and a time-domain analytical expression of DFIG short circuit current is proposed for the symmetrical and asymmetrical grid faults.A type of Crowbar consisting of resistor in series with capacitor is proposed and the selection method for its capacitor is given.Compared with the traditional Crowbar,it limits the rotor surge current more effectively and improves the power characteristics of DFIG stator end during fault period.Based on a 1.5MW DFIG wind energy conversion simulation system and a 3kW DFIG test platform,the accuracy of short circuit current analytical analysis and the effectiveness of the proposed Crowbar are validated by the simulative and experimental results.

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What this paper is about

The complete response of DFIG(Doubly-Fed Induction Generator) stator and rotor fluxes to the firing of Crowbar is analyzed and a time-domain analytical expression of DFIG short circuit current is proposed for the symmetrical and asymmetrical grid faults.A type of Crowbar consisting of resistor in series with capacitor is proposed and the selection method for its capacitor is given.Compared with the traditional Crowbar,it limits the rotor surge current more effectively and improves the power characteristics of DFIG stator end during fault period.Based on a 1.5MW DFIG wind energy conversion simulation system and a 3kW DFIG test platform,the accuracy of short circuit current analytical analysis and the effectiveness of the proposed Crowbar are validated by the simulative and experimental results.

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Available abstract

The complete response of DFIG(Doubly-Fed Induction Generator) stator and rotor fluxes to the firing of Crowbar is analyzed and a time-domain analytical expression of DFIG short circuit current is proposed for the symmetrical and asymmetrical grid faults.A type of Crowbar consisting of resistor in series with capacitor is proposed and the selection method for its capacitor is given.Compared with the traditional Crowbar,it limits the rotor surge current more effectively and improves the power characteristics of DFIG stator end during fault period.Based on a 1.5MW DFIG wind energy conversion simulation system and a 3kW DFIG test platform,the accuracy of short circuit current analytical analysis and the effectiveness of the proposed Crowbar are validated by the simulative and experimental results.

Key concepts: Crowbar, Stator, Rotor (electric), Induction generator, Resistor, Control theory (sociology), Capacitor, Wind power

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Short circuit current analysis for DFIG-based wind generation system with Crowbar protection under grid faults — Research Paper | ScholarLens