In industrial applications, efficiency of the drive system can be improved by using variable speed drives instead of constant speed drives. Widely used variable speed drives for small power applications are squirrel cage induction machines and synchronous machines, both supplied by IGBT-PWM based converters. Since the converters are connected at the stator terminals, they should be rated for the full motor power and hence very costly.

But, if converters can be connected at the rotor terminals, the converter rating can be very less depending on the speed range required. Doubly fed induction machines provide a very economic solution for variable speed applications because, here the converter is connected at the rotor terminals.

Thus discusses a Fuzzy Logic Controller (FLC) based method for reducing the torque ripple in a Doubly Fed Induction machine (DFIM) in which Direct Torque Control (DTC) scheme is applied. DFIM is gaining popularity as the best alternative for wind energy generation system. Often, wind energy generation demands good torque dynamic performance. The proposed method gives reduced torque ripple as compared to conventional DTC scheme

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Tue, 12/04/2011 - 14:52