Abslroct:Doubly-fed induction generators are used mainly for wind energy conversion in MW power plants. They have a rotor inverter and a front-end converter while the stator is linked directly to the grid. If a dc bus bar is available, a double feeding can occur about inverter. This paper describes a doubly-led fullcontrolled induction wind generator which offers high flexibility of stator side control to ensure minimal losses as well as optimal power utilisation. The equation of the optimal loss reglme is derived while simulation results show improvements in the eniciency power extraction. The special wind converter system has been investigated at a glance of installed off-shore MWgenerators, where a dc-transmission is advantageous because of the avoided reactive power. The precalculated improvements behave 6% at most in the winddriven range. Some investigations with the operating characteristic in winddriven and constant power modes are presented and discussed.
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