To Enhance the Fault Ride Through Capability of Doubly Fed Induction Generator using Direct Matrix Converter for Wind Turbines

Abstract:
To enhance the fault ride through capability of Doubly Fed Induction Generator (DFIG) fed Direct Matrix Converter (DMC) for wind turbines. In conventional DFIG based wind turbines Back-to-Back converters are used which contains large DC-link capacitors which decreases the reliability of the system as 30% failure of back-to-back converter is caused by faults occurs in DC-link capacitors, and two step conversions are involves more conversion losses. The proposed research will replace back-to-back converter with DMC which will reduce the size of system as no DC-link capacitors are required in this topology. Moreover, DMC has high voltage transfer ratio, bidirectional power flow, sinusoidal output voltage waveform, and low total harmonic distortion. To develop a new control and modulation technique for DMC to control the DFIG for wind turbines. Optimizing the switching of DMC to reduce total harmonic distortion and to prevent the thermal run away of semiconductor bidirectional switches caused by heat produce in converter by power losses during power conversion which will increase the reliability of the system. Input filter resonance is an issue for direct matrix converter which will be addressed.