Type 1 Wind Turbine Generators

A Type 1 wind turbine is characterized by a Squirrel-cage Induction Generator (SCIG), which is connected directly to the step up transformer.  The turbine rotates at a speed that closely follows the electrical grid frequency.  A negative slip results when the turbine shaft rotates faster than the electrical grid frequency, this generates real power when the positive slip and power motoring convention is used.  Under steady conditions a given wind speed will result in a near linear turbine speed, torque characteristic.  Due to the mechanical inertia of the system, sudden changes in wind speed result in a limited rate of change in electrical output.