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The synchronous reference frame is widely used in DFIG modeling. It is usually assumed that slip control is in place at the rotor-side converters to make sure that the injected rotor voltage at slip frequency gives a nominal stator frequency (60 Hz or 50 Hz). In the analysis, the injected rotor voltages are directly expressed in the synchronous reference frame. In the cases where slip control is not...
This paper developed three control schemes to coordinate maximum power extraction and voltage control for doubly fed induction generators wind turbines during wind fluctuation. Via PWM, the rotor-side converter can generate a controllable AC voltage with controllable magnitude and frequency. Based on PWM, control schemes: slip control, flux magnitude and angle (FMA) control and vector control are...
Doubly fed induction generators (DFIGs) are widely used in wind generation. The possibility of getting a constant frequency AC output from a DFIG while driven by a variable speed prime mover improves the efficacy of energy harvest from wind. In the power lab at North Dakota State University (NDSU), the wind turbine is substituted by a variable-speed DC motor which dives a DFIG. A wound rotor induction...
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