The WRIG Phase Coordinate Model

The WRIG is furnished with laminated stator & rotor cores with uniform slots in which 3-phase windings are placed (Fig 2.1 below). Usually, the rotor winding is connected to copper slip-rings.

Brushes on the stator gather (or transmit) the rotor currents from (to) the rotor-side static power converter. For the time being,  the slip-ring–brush system resistances are lumped into rotor phase resistances,

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Wound Rotor Induction Generators WRIGS

WRIGs have been constructed for powers per unit up to 4 hundred megawatt (MW) in pump-storage power plants & down to 4.0 MW per unit when used in wind power plants. Diesel engine or gas–turbine-driven WRIGs for stand-by or autonomous operation up to twenty to forty MW may also be useful to reduce fuel consumption & pollution for variable load. Under1.5 to 2 MW/unit, WRIGs are not straightforward to justify in terms of cost per performance and benefits against full the power rating converter synchronous or cage-rotor induction generator systems.

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