Using renewable energy resources specially wind power during last two decades has increased as worldwide, there are now over two hundred thousand wind turbines operating, with a total nameplate capacity of 282,482 MW as of end 2012. [1,2] During this time, several wind turbine concepts h turbine systems: fixed-speed wind generators with multi single-stage or multi-stage gearbox) and direct Because of several advantages such as removing the gearbox, drive simplification, longevity, high reliability, weight reduction, maintenance cost reduction, higher aggregate efficiency, low level of vibration and noise of the drive train, simplified SCADA structure variable speed structures in wind power turbines are in attention. [4,5] Periodicals of Engineering and Natural Sciences http://pen.ius.edu.ba
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