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A novel control strategy is proposed in this paper since available sensorless speed control strategies of doubly fed induction generator (DFIG) usually fail around the synchronous speed or limited by the operation state (motor or generator). The new control strategy uses the stator voltage to estimate the rotor position and speed. This strategy works properly in the whole speed zone. The principle...
Decoupled control has been widely used in the DIFG (doubly fed induction generator) which needs the rotor position as well as the rotor speed for the control system. A lot of research has been done in the sensorless control field for the DFIG because of the disadvantages of the speed sensor. Three representative sensorless control strategies are considered in this paper and they are compared in terms...
The doubly-fed induction generator (DFIG) based wind turbines of today are often equipped with a crowbar, which can be used to limit the inrush rotor current and protect the ac excitation converter from damage via a set of resistors that are connected to the rotor windings of the DFIG. When the rotor current becomes too high due to the severe grid voltage dips on the transmission line, the crowbar...
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